Merge commit 'v2.6.30-rc1' into sched/urgent

Merge reason: update to latest upstream to queue up fix

Signed-off-by: Ingo Molnar <mingo@elte.hu>

132 files changed, 17625 insertions, 5074 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index 170a9213c1b6..42423665660a 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -51,6 +51,7 @@ obj-$(CONFIG_UID16) += uid16.o
 obj-$(CONFIG_MODULES) += module.o
 obj-$(CONFIG_KALLSYMS) += kallsyms.o
 obj-$(CONFIG_PM) += power/
+obj-$(CONFIG_FREEZER) += power/
 obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
 obj-$(CONFIG_KEXEC) += kexec.o
 obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
@@ -73,6 +74,7 @@ obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
 obj-$(CONFIG_KPROBES) += kprobes.o
 obj-$(CONFIG_KGDB) += kgdb.o
 obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o
+obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
 obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
 obj-$(CONFIG_SECCOMP) += seccomp.o
 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
@@ -92,6 +94,7 @@ obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
 obj-$(CONFIG_FUNCTION_TRACER) += trace/
 obj-$(CONFIG_TRACING) += trace/
 obj-$(CONFIG_SMP) += sched_cpupri.o
+obj-$(CONFIG_SLOW_WORK) += slow-work.o
 
 ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
 # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
diff --git a/kernel/async.c b/kernel/async.c
index 67a2be71f517..968ef9457d4e 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -49,11 +49,13 @@ asynchronous and synchronous parts of the kernel.
 */
 
 #include <linux/async.h>
+#include <linux/bug.h>
 #include <linux/module.h>
 #include <linux/wait.h>
 #include <linux/sched.h>
 #include <linux/init.h>
 #include <linux/kthread.h>
+#include <linux/delay.h>
 #include <asm/atomic.h>
 
 static async_cookie_t next_cookie = 1;
@@ -132,8 +134,7 @@ static void run_one_entry(void)
         entry = list_first_entry(&async_pending, struct async_entry, list);
 
         /* 2) move it to the running queue */
-        list_del(&entry->list);
-        list_add_tail(&entry->list, &async_running);
+        list_move_tail(&entry->list, entry->running);
         spin_unlock_irqrestore(&async_lock, flags);
 
         /* 3) run it (and print duration)*/
@@ -208,18 +209,44 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct l
         return newcookie;
 }
 
+/**
+ * async_schedule - schedule a function for asynchronous execution
+ * @ptr: function to execute asynchronously
+ * @data: data pointer to pass to the function
+ *
+ * Returns an async_cookie_t that may be used for checkpointing later.
+ * Note: This function may be called from atomic or non-atomic contexts.
+ */
 async_cookie_t async_schedule(async_func_ptr *ptr, void *data)
 {
-        return __async_schedule(ptr, data, &async_pending);
+        return __async_schedule(ptr, data, &async_running);
 }
 EXPORT_SYMBOL_GPL(async_schedule);
 
-async_cookie_t async_schedule_special(async_func_ptr *ptr, void *data, struct list_head *running)
+/**
+ * async_schedule_domain - schedule a function for asynchronous execution within a certain domain
+ * @ptr: function to execute asynchronously
+ * @data: data pointer to pass to the function
+ * @running: running list for the domain
+ *
+ * Returns an async_cookie_t that may be used for checkpointing later.
+ * @running may be used in the async_synchronize_*_domain() functions
+ * to wait within a certain synchronization domain rather than globally.
+ * A synchronization domain is specified via the running queue @running to use.
+ * Note: This function may be called from atomic or non-atomic contexts.
+ */
+async_cookie_t async_schedule_domain(async_func_ptr *ptr, void *data,
+                                     struct list_head *running)
 {
         return __async_schedule(ptr, data, running);
 }
-EXPORT_SYMBOL_GPL(async_schedule_special);
+EXPORT_SYMBOL_GPL(async_schedule_domain);
 
+/**
+ * async_synchronize_full - synchronize all asynchronous function calls
+ *
+ * This function waits until all asynchronous function calls have been done.
+ */
 void async_synchronize_full(void)
 {
         do {
@@ -228,13 +255,30 @@ void async_synchronize_full(void)
 }
 EXPORT_SYMBOL_GPL(async_synchronize_full);
 
-void async_synchronize_full_special(struct list_head *list)
+/**
+ * async_synchronize_full_domain - synchronize all asynchronous function within a certain domain
+ * @list: running list to synchronize on
+ *
+ * This function waits until all asynchronous function calls for the
+ * synchronization domain specified by the running list @list have been done.
+ */
+void async_synchronize_full_domain(struct list_head *list)
 {
-        async_synchronize_cookie_special(next_cookie, list);
+        async_synchronize_cookie_domain(next_cookie, list);
 }
-EXPORT_SYMBOL_GPL(async_synchronize_full_special);
+EXPORT_SYMBOL_GPL(async_synchronize_full_domain);
 
-void async_synchronize_cookie_special(async_cookie_t cookie, struct list_head *running)
+/**
+ * async_synchronize_cookie_domain - synchronize asynchronous function calls within a certain domain with cookie checkpointing
+ * @cookie: async_cookie_t to use as checkpoint
+ * @running: running list to synchronize on
+ *
+ * This function waits until all asynchronous function calls for the
+ * synchronization domain specified by the running list @list submitted
+ * prior to @cookie have been done.
+ */
+void async_synchronize_cookie_domain(async_cookie_t cookie,
+                                     struct list_head *running)
 {
         ktime_t starttime, delta, endtime;
 
@@ -254,11 +298,18 @@ void async_synchronize_cookie_special(async_cookie_t cookie, struct list_head *r
                         (long long)ktime_to_ns(delta) >> 10);
         }
 }
-EXPORT_SYMBOL_GPL(async_synchronize_cookie_special);
+EXPORT_SYMBOL_GPL(async_synchronize_cookie_domain);
 
+/**
+ * async_synchronize_cookie - synchronize asynchronous function calls with cookie checkpointing
+ * @cookie: async_cookie_t to use as checkpoint
+ *
+ * This function waits until all asynchronous function calls prior to @cookie
+ * have been done.
+ */
 void async_synchronize_cookie(async_cookie_t cookie)
 {
-        async_synchronize_cookie_special(cookie, &async_running);
+        async_synchronize_cookie_domain(cookie, &async_running);
 }
 EXPORT_SYMBOL_GPL(async_synchronize_cookie);
 
@@ -319,7 +370,11 @@ static int async_manager_thread(void *unused)
                 ec = atomic_read(&entry_count);
 
                 while (tc < ec && tc < MAX_THREADS) {
-                        kthread_run(async_thread, NULL, "async/%i", tc);
+                        if (IS_ERR(kthread_run(async_thread, NULL, "async/%i",
+                                               tc))) {
+                                msleep(100);
+                                continue;
+                        }
                         atomic_inc(&thread_count);
                         tc++;
                 }
@@ -333,18 +388,11 @@ static int async_manager_thread(void *unused)
 
 static int __init async_init(void)
 {
-        if (async_enabled)
-                kthread_run(async_manager_thread, NULL, "async/mgr");
-        return 0;
-}
+        async_enabled =
+                !IS_ERR(kthread_run(async_manager_thread, NULL, "async/mgr"));
 
-static int __init setup_async(char *str)
-{
-        async_enabled = 1;
-        return 1;
+        WARN_ON(!async_enabled);
+        return 0;
 }
 
-__setup("fastboot", setup_async);
-
-
 core_initcall(async_init);
diff --git a/kernel/audit.c b/kernel/audit.c
index ce6d8ea3131e..9442c3533ba9 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -766,6 +766,9 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 
                                 audit_log_format(ab, " msg=");
                                 size = nlmsg_len(nlh);
+                                if (size > 0 &&
+                                    ((unsigned char *)data)[size - 1] == '\0')
+                                        size--;
                                 audit_log_n_untrustedstring(ab, data, size);
                         }
                         audit_set_pid(ab, pid);
@@ -1382,7 +1385,7 @@ void audit_log_n_string(struct audit_buffer *ab, const char *string,
 int audit_string_contains_control(const char *string, size_t len)
 {
         const unsigned char *p;
-        for (p = string; p < (const unsigned char *)string + len && *p; p++) {
+        for (p = string; p < (const unsigned char *)string + len; p++) {
                 if (*p == '"' || *p < 0x21 || *p > 0x7e)
                         return 1;
         }
@@ -1437,13 +1440,13 @@ void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
         /* We will allow 11 spaces for ' (deleted)' to be appended */
         pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
         if (!pathname) {
-                audit_log_format(ab, "<no memory>");
+                audit_log_string(ab, "<no_memory>");
                 return;
         }
         p = d_path(path, pathname, PATH_MAX+11);
         if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
                 /* FIXME: can we save some information here? */
-                audit_log_format(ab, "<too long>");
+                audit_log_string(ab, "<too_long>");
         } else
                 audit_log_untrustedstring(ab, p);
         kfree(pathname);
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index 8ad9545b8db9..917ab9525568 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -385,6 +385,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
         mutex_lock(&inode->inotify_mutex);
         if (inotify_clone_watch(&old->watch, &chunk->watch) < 0) {
                 mutex_unlock(&inode->inotify_mutex);
+                put_inotify_watch(&old->watch);
                 free_chunk(chunk);
                 return -ENOSPC;
         }
@@ -394,6 +395,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
                 chunk->dead = 1;
                 inotify_evict_watch(&chunk->watch);
                 mutex_unlock(&inode->inotify_mutex);
+                put_inotify_watch(&old->watch);
                 put_inotify_watch(&chunk->watch);
                 return 0;
         }
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index fbf24d121d97..a6fe71fd5d1b 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -135,18 +135,18 @@ static void audit_remove_watch(struct audit_watch *watch)
 static inline void audit_free_rule(struct audit_entry *e)
 {
         int i;
-
+        struct audit_krule *erule = &e->rule;
         /* some rules don't have associated watches */
-        if (e->rule.watch)
-                audit_put_watch(e->rule.watch);
-        if (e->rule.fields)
-                for (i = 0; i < e->rule.field_count; i++) {
-                        struct audit_field *f = &e->rule.fields[i];
+        if (erule->watch)
+                audit_put_watch(erule->watch);
+        if (erule->fields)
+                for (i = 0; i < erule->field_count; i++) {
+                        struct audit_field *f = &erule->fields[i];
                         kfree(f->lsm_str);
                         security_audit_rule_free(f->lsm_rule);
                 }
-        kfree(e->rule.fields);
-        kfree(e->rule.filterkey);
+        kfree(erule->fields);
+        kfree(erule->filterkey);
         kfree(e);
 }
 
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 8cbddff6c283..7d6ac7c1f414 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -66,6 +66,7 @@
 #include <linux/syscalls.h>
 #include <linux/inotify.h>
 #include <linux/capability.h>
+#include <linux/fs_struct.h>
 
 #include "audit.h"
 
@@ -328,6 +329,14 @@ static int audit_match_filetype(struct audit_context *ctx, int which)
  */
 
 #ifdef CONFIG_AUDIT_TREE
+static void audit_set_auditable(struct audit_context *ctx)
+{
+        if (!ctx->prio) {
+                ctx->prio = 1;
+                ctx->current_state = AUDIT_RECORD_CONTEXT;
+        }
+}
+
 static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk)
 {
         struct audit_tree_refs *p = ctx->trees;
@@ -741,17 +750,9 @@ void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
         rcu_read_unlock();
 }
 
-static void audit_set_auditable(struct audit_context *ctx)
-{
-        if (!ctx->prio) {
-                ctx->prio = 1;
-                ctx->current_state = AUDIT_RECORD_CONTEXT;
-        }
-}
-
 static inline struct audit_context *audit_get_context(struct task_struct *tsk,
                                                       int return_valid,
-                                                      int return_code)
+                                                      long return_code)
 {
         struct audit_context *context = tsk->audit_context;
 
@@ -1023,7 +1024,7 @@ static int audit_log_single_execve_arg(struct audit_context *context,
 {
         char arg_num_len_buf[12];
         const char __user *tmp_p = p;
-        /* how many digits are in arg_num? 3 is the length of a=\n */
+        /* how many digits are in arg_num? 3 is the length of " a=" */
         size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 3;
         size_t len, len_left, to_send;
         size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN;
@@ -1109,7 +1110,7 @@ static int audit_log_single_execve_arg(struct audit_context *context,
                  * so we can be sure nothing was lost.
                  */
                 if ((i == 0) && (too_long))
-                        audit_log_format(*ab, "a%d_len=%zu ", arg_num,
+                        audit_log_format(*ab, " a%d_len=%zu", arg_num,
                                          has_cntl ? 2*len : len);
 
                 /*
@@ -1129,7 +1130,7 @@ static int audit_log_single_execve_arg(struct audit_context *context,
                 buf[to_send] = '\0';
 
                 /* actually log it */
-                audit_log_format(*ab, "a%d", arg_num);
+                audit_log_format(*ab, " a%d", arg_num);
                 if (too_long)
                         audit_log_format(*ab, "[%d]", i);
                 audit_log_format(*ab, "=");
@@ -1137,7 +1138,6 @@ static int audit_log_single_execve_arg(struct audit_context *context,
                         audit_log_n_hex(*ab, buf, to_send);
                 else
                         audit_log_format(*ab, "\"%s\"", buf);
-                audit_log_format(*ab, "\n");
 
                 p += to_send;
                 len_left -= to_send;
@@ -1165,7 +1165,7 @@ static void audit_log_execve_info(struct audit_context *context,
 
         p = (const char __user *)axi->mm->arg_start;
 
-        audit_log_format(*ab, "argc=%d ", axi->argc);
+        audit_log_format(*ab, "argc=%d", axi->argc);
 
         /*
          * we need some kernel buffer to hold the userspace args.  Just
@@ -1478,7 +1478,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
                         case 0:
                                 /* name was specified as a relative path and the
                                  * directory component is the cwd */
-                                audit_log_d_path(ab, " name=", &context->pwd);
+                                audit_log_d_path(ab, "name=", &context->pwd);
                                 break;
                         default:
                                 /* log the name's directory component */
@@ -2149,7 +2149,7 @@ int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
  * __audit_mq_open - record audit data for a POSIX MQ open
  * @oflag: open flag
  * @mode: mode bits
- * @u_attr: queue attributes
+ * @attr: queue attributes
  *
  */
 void __audit_mq_open(int oflag, mode_t mode, struct mq_attr *attr)
@@ -2196,7 +2196,7 @@ void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
 /**
  * __audit_mq_notify - record audit data for a POSIX MQ notify
  * @mqdes: MQ descriptor
- * @u_notification: Notification event
+ * @notification: Notification event
  *
  */
 
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 5a54ff42874e..382109b5baeb 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -94,7 +94,6 @@ struct cgroupfs_root {
         char release_agent_path[PATH_MAX];
 };
 
-
 /*
  * The "rootnode" hierarchy is the "dummy hierarchy", reserved for the
  * subsystems that are otherwise unattached - it never has more than a
@@ -102,6 +101,39 @@ struct cgroupfs_root {
  */
 static struct cgroupfs_root rootnode;
 
+/*
+ * CSS ID -- ID per subsys's Cgroup Subsys State(CSS). used only when
+ * cgroup_subsys->use_id != 0.
+ */
+#define CSS_ID_MAX      (65535)
+struct css_id {
+        /*
+         * The css to which this ID points. This pointer is set to valid value
+         * after cgroup is populated. If cgroup is removed, this will be NULL.
+         * This pointer is expected to be RCU-safe because destroy()
+         * is called after synchronize_rcu(). But for safe use, css_is_removed()
+         * css_tryget() should be used for avoiding race.
+         */
+        struct cgroup_subsys_state *css;
+        /*
+         * ID of this css.
+         */
+        unsigned short id;
+        /*
+         * Depth in hierarchy which this ID belongs to.
+         */
+        unsigned short depth;
+        /*
+         * ID is freed by RCU. (and lookup routine is RCU safe.)
+         */
+        struct rcu_head rcu_head;
+        /*
+         * Hierarchy of CSS ID belongs to.
+         */
+        unsigned short stack[0]; /* Array of Length (depth+1) */
+};
+
+
 /* The list of hierarchy roots */
 
 static LIST_HEAD(roots);
@@ -185,6 +217,8 @@ struct cg_cgroup_link {
 static struct css_set init_css_set;
 static struct cg_cgroup_link init_css_set_link;
 
+static int cgroup_subsys_init_idr(struct cgroup_subsys *ss);
+
 /* css_set_lock protects the list of css_set objects, and the
  * chain of tasks off each css_set.  Nests outside task->alloc_lock
  * due to cgroup_iter_start() */
@@ -567,6 +601,9 @@ static struct backing_dev_info cgroup_backing_dev_info = {
         .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK,
 };
 
+static int alloc_css_id(struct cgroup_subsys *ss,
+                        struct cgroup *parent, struct cgroup *child);
+
 static struct inode *cgroup_new_inode(mode_t mode, struct super_block *sb)
 {
         struct inode *inode = new_inode(sb);
@@ -585,13 +622,18 @@ static struct inode *cgroup_new_inode(mode_t mode, struct super_block *sb)
  * Call subsys's pre_destroy handler.
  * This is called before css refcnt check.
  */
-static void cgroup_call_pre_destroy(struct cgroup *cgrp)
+static int cgroup_call_pre_destroy(struct cgroup *cgrp)
 {
         struct cgroup_subsys *ss;
+        int ret = 0;
+
         for_each_subsys(cgrp->root, ss)
-                if (ss->pre_destroy)
-                        ss->pre_destroy(ss, cgrp);
-        return;
+                if (ss->pre_destroy) {
+                        ret = ss->pre_destroy(ss, cgrp);
+                        if (ret)
+                                break;
+                }
+        return ret;
 }
 
 static void free_cgroup_rcu(struct rcu_head *obj)
@@ -685,6 +727,22 @@ static void cgroup_d_remove_dir(struct dentry *dentry)
         remove_dir(dentry);
 }
 
+/*
+ * A queue for waiters to do rmdir() cgroup. A tasks will sleep when
+ * cgroup->count == 0 && list_empty(&cgroup->children) && subsys has some
+ * reference to css->refcnt. In general, this refcnt is expected to goes down
+ * to zero, soon.
+ *
+ * CGRP_WAIT_ON_RMDIR flag is modified under cgroup's inode->i_mutex;
+ */
+DECLARE_WAIT_QUEUE_HEAD(cgroup_rmdir_waitq);
+
+static void cgroup_wakeup_rmdir_waiters(const struct cgroup *cgrp)
+{
+        if (unlikely(test_bit(CGRP_WAIT_ON_RMDIR, &cgrp->flags)))
+                wake_up_all(&cgroup_rmdir_waitq);
+}
+
 static int rebind_subsystems(struct cgroupfs_root *root,
                               unsigned long final_bits)
 {
@@ -857,16 +915,16 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
         }
 
         ret = rebind_subsystems(root, opts.subsys_bits);
+        if (ret)
+                goto out_unlock;
 
         /* (re)populate subsystem files */
-        if (!ret)
-                cgroup_populate_dir(cgrp);
+        cgroup_populate_dir(cgrp);
 
         if (opts.release_agent)
                 strcpy(root->release_agent_path, opts.release_agent);
  out_unlock:
-        if (opts.release_agent)
-                kfree(opts.release_agent);
+        kfree(opts.release_agent);
         mutex_unlock(&cgroup_mutex);
         mutex_unlock(&cgrp->dentry->d_inode->i_mutex);
         return ret;
@@ -969,15 +1027,13 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
         /* First find the desired set of subsystems */
         ret = parse_cgroupfs_options(data, &opts);
         if (ret) {
-                if (opts.release_agent)
-                        kfree(opts.release_agent);
+                kfree(opts.release_agent);
                 return ret;
         }
 
         root = kzalloc(sizeof(*root), GFP_KERNEL);
         if (!root) {
-                if (opts.release_agent)
-                        kfree(opts.release_agent);
+                kfree(opts.release_agent);
                 return -ENOMEM;
         }
 
@@ -1071,7 +1127,8 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
                 mutex_unlock(&cgroup_mutex);
         }
 
-        return simple_set_mnt(mnt, sb);
+        simple_set_mnt(mnt, sb);
+        return 0;
 
  free_cg_links:
         free_cg_links(&tmp_cg_links);
@@ -1122,8 +1179,8 @@ static void cgroup_kill_sb(struct super_block *sb) {
 
         mutex_unlock(&cgroup_mutex);
 
-        kfree(root);
         kill_litter_super(sb);
+        kfree(root);
 }
 
 static struct file_system_type cgroup_fs_type = {
@@ -1279,6 +1336,12 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
         set_bit(CGRP_RELEASABLE, &oldcgrp->flags);
         synchronize_rcu();
         put_css_set(cg);
+
+        /*
+         * wake up rmdir() waiter. the rmdir should fail since the cgroup
+         * is no longer empty.
+         */
+        cgroup_wakeup_rmdir_waiters(cgrp);
         return 0;
 }
 
@@ -1624,10 +1687,10 @@ static struct inode_operations cgroup_dir_inode_operations = {
         .rename = cgroup_rename,
 };
 
-static int cgroup_create_file(struct dentry *dentry, int mode,
+static int cgroup_create_file(struct dentry *dentry, mode_t mode,
                                 struct super_block *sb)
 {
-        static struct dentry_operations cgroup_dops = {
+        static const struct dentry_operations cgroup_dops = {
                 .d_iput = cgroup_diput,
         };
 
@@ -1670,7 +1733,7 @@ static int cgroup_create_file(struct dentry *dentry, int mode,
  * @mode: mode to set on new directory.
  */
 static int cgroup_create_dir(struct cgroup *cgrp, struct dentry *dentry,
-                                int mode)
+                                mode_t mode)
 {
         struct dentry *parent;
         int error = 0;
@@ -1688,6 +1751,33 @@ static int cgroup_create_dir(struct cgroup *cgrp, struct dentry *dentry,
         return error;
 }
 
+/**
+ * cgroup_file_mode - deduce file mode of a control file
+ * @cft: the control file in question
+ *
+ * returns cft->mode if ->mode is not 0
+ * returns S_IRUGO|S_IWUSR if it has both a read and a write handler
+ * returns S_IRUGO if it has only a read handler
+ * returns S_IWUSR if it has only a write hander
+ */
+static mode_t cgroup_file_mode(const struct cftype *cft)
+{
+        mode_t mode = 0;
+
+        if (cft->mode)
+                return cft->mode;
+
+        if (cft->read || cft->read_u64 || cft->read_s64 ||
+            cft->read_map || cft->read_seq_string)
+                mode |= S_IRUGO;
+
+        if (cft->write || cft->write_u64 || cft->write_s64 ||
+            cft->write_string || cft->trigger)
+                mode |= S_IWUSR;
+
+        return mode;
+}
+
 int cgroup_add_file(struct cgroup *cgrp,
                        struct cgroup_subsys *subsys,
                        const struct cftype *cft)
@@ -1695,6 +1785,7 @@ int cgroup_add_file(struct cgroup *cgrp,
         struct dentry *dir = cgrp->dentry;
         struct dentry *dentry;
         int error;
+        mode_t mode;
 
         char name[MAX_CGROUP_TYPE_NAMELEN + MAX_CFTYPE_NAME + 2] = { 0 };
         if (subsys && !test_bit(ROOT_NOPREFIX, &cgrp->root->flags)) {
@@ -1705,7 +1796,8 @@ int cgroup_add_file(struct cgroup *cgrp,
         BUG_ON(!mutex_is_locked(&dir->d_inode->i_mutex));
         dentry = lookup_one_len(name, dir, strlen(name));
         if (!IS_ERR(dentry)) {
-                error = cgroup_create_file(dentry, 0644 | S_IFREG,
+                mode = cgroup_file_mode(cft);
+                error = cgroup_create_file(dentry, mode | S_IFREG,
                                                 cgrp->root->sb);
                 if (!error)
                         dentry->d_fsdata = (void *)cft;
@@ -2287,6 +2379,7 @@ static struct cftype files[] = {
                 .write_u64 = cgroup_tasks_write,
                 .release = cgroup_tasks_release,
                 .private = FILE_TASKLIST,
+                .mode = S_IRUGO | S_IWUSR,
         },
 
         {
@@ -2326,6 +2419,17 @@ static int cgroup_populate_dir(struct cgroup *cgrp)
                 if (ss->populate && (err = ss->populate(ss, cgrp)) < 0)
                         return err;
         }
+        /* This cgroup is ready now */
+        for_each_subsys(cgrp->root, ss) {
+                struct cgroup_subsys_state *css = cgrp->subsys[ss->subsys_id];
+                /*
+                 * Update id->css pointer and make this css visible from
+                 * CSS ID functions. This pointer will be dereferened
+                 * from RCU-read-side without locks.
+                 */
+                if (css->id)
+                        rcu_assign_pointer(css->id->css, css);
+        }
 
         return 0;
 }
@@ -2337,6 +2441,7 @@ static void init_cgroup_css(struct cgroup_subsys_state *css,
         css->cgroup = cgrp;
         atomic_set(&css->refcnt, 1);
         css->flags = 0;
+        css->id = NULL;
         if (cgrp == dummytop)
                 set_bit(CSS_ROOT, &css->flags);
         BUG_ON(cgrp->subsys[ss->subsys_id]);
@@ -2351,7 +2456,7 @@ static void cgroup_lock_hierarchy(struct cgroupfs_root *root)
         for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
                 struct cgroup_subsys *ss = subsys[i];
                 if (ss->root == root)
-                        mutex_lock_nested(&ss->hierarchy_mutex, i);
+                        mutex_lock(&ss->hierarchy_mutex);
         }
 }
 
@@ -2375,7 +2480,7 @@ static void cgroup_unlock_hierarchy(struct cgroupfs_root *root)
  * Must be called with the mutex on the parent inode held
  */
 static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
-                             int mode)
+                             mode_t mode)
 {
         struct cgroup *cgrp;
         struct cgroupfs_root *root = parent->root;
@@ -2412,6 +2517,10 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
                         goto err_destroy;
                 }
                 init_cgroup_css(css, ss, cgrp);
+                if (ss->use_id)
+                        if (alloc_css_id(ss, parent, cgrp))
+                                goto err_destroy;
+                /* At error, ->destroy() callback has to free assigned ID. */
         }
 
         cgroup_lock_hierarchy(root);
@@ -2554,9 +2663,11 @@ static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry)
         struct cgroup *cgrp = dentry->d_fsdata;
         struct dentry *d;
         struct cgroup *parent;
+        DEFINE_WAIT(wait);
+        int ret;
 
         /* the vfs holds both inode->i_mutex already */
-
+again:
         mutex_lock(&cgroup_mutex);
         if (atomic_read(&cgrp->count) != 0) {
                 mutex_unlock(&cgroup_mutex);
@@ -2572,17 +2683,39 @@ static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry)
          * Call pre_destroy handlers of subsys. Notify subsystems
          * that rmdir() request comes.
          */
-        cgroup_call_pre_destroy(cgrp);
+        ret = cgroup_call_pre_destroy(cgrp);
+        if (ret)
+                return ret;
 
         mutex_lock(&cgroup_mutex);
         parent = cgrp->parent;
-
-        if (atomic_read(&cgrp->count)
-            || !list_empty(&cgrp->children)
-            || !cgroup_clear_css_refs(cgrp)) {
+        if (atomic_read(&cgrp->count) || !list_empty(&cgrp->children)) {
                 mutex_unlock(&cgroup_mutex);
                 return -EBUSY;
         }
+        /*
+         * css_put/get is provided for subsys to grab refcnt to css. In typical
+         * case, subsystem has no reference after pre_destroy(). But, under
+         * hierarchy management, some *temporal* refcnt can be hold.
+         * To avoid returning -EBUSY to a user, waitqueue is used. If subsys
+         * is really busy, it should return -EBUSY at pre_destroy(). wake_up
+         * is called when css_put() is called and refcnt goes down to 0.
+         */
+        set_bit(CGRP_WAIT_ON_RMDIR, &cgrp->flags);
+        prepare_to_wait(&cgroup_rmdir_waitq, &wait, TASK_INTERRUPTIBLE);
+
+        if (!cgroup_clear_css_refs(cgrp)) {
+                mutex_unlock(&cgroup_mutex);
+                schedule();
+                finish_wait(&cgroup_rmdir_waitq, &wait);
+                clear_bit(CGRP_WAIT_ON_RMDIR, &cgrp->flags);
+                if (signal_pending(current))
+                        return -EINTR;
+                goto again;
+        }
+        /* NO css_tryget() can success after here. */
+        finish_wait(&cgroup_rmdir_waitq, &wait);
+        clear_bit(CGRP_WAIT_ON_RMDIR, &cgrp->flags);
 
         spin_lock(&release_list_lock);
         set_bit(CGRP_REMOVED, &cgrp->flags);
@@ -2637,6 +2770,7 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
         BUG_ON(!list_empty(&init_task.tasks));
 
         mutex_init(&ss->hierarchy_mutex);
+        lockdep_set_class(&ss->hierarchy_mutex, &ss->subsys_key);
         ss->active = 1;
 }
 
@@ -2706,6 +2840,8 @@ int __init cgroup_init(void)
                 struct cgroup_subsys *ss = subsys[i];
                 if (!ss->early_init)
                         cgroup_init_subsys(ss);
+                if (ss->use_id)
+                        cgroup_subsys_init_idr(ss);
         }
 
         /* Add init_css_set to the hash table */
@@ -3082,18 +3218,19 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,
 }
 
 /**
- * cgroup_is_descendant - see if @cgrp is a descendant of current task's cgrp
+ * cgroup_is_descendant - see if @cgrp is a descendant of @task's cgrp
  * @cgrp: the cgroup in question
+ * @task: the task in question
  *
- * See if @cgrp is a descendant of the current task's cgroup in
- * the appropriate hierarchy.
+ * See if @cgrp is a descendant of @task's cgroup in the appropriate
+ * hierarchy.
  *
  * If we are sending in dummytop, then presumably we are creating
  * the top cgroup in the subsystem.
  *
  * Called only by the ns (nsproxy) cgroup.
  */
-int cgroup_is_descendant(const struct cgroup *cgrp)
+int cgroup_is_descendant(const struct cgroup *cgrp, struct task_struct *task)
 {
         int ret;
         struct cgroup *target;
@@ -3103,7 +3240,7 @@ int cgroup_is_descendant(const struct cgroup *cgrp)
                 return 1;
 
         get_first_subsys(cgrp, NULL, &subsys_id);
-        target = task_cgroup(current, subsys_id);
+        target = task_cgroup(task, subsys_id);
         while (cgrp != target && cgrp!= cgrp->top_cgroup)
                 cgrp = cgrp->parent;
         ret = (cgrp == target);
@@ -3136,10 +3273,12 @@ void __css_put(struct cgroup_subsys_state *css)
 {
         struct cgroup *cgrp = css->cgroup;
         rcu_read_lock();
-        if ((atomic_dec_return(&css->refcnt) == 1) &&
-            notify_on_release(cgrp)) {
-                set_bit(CGRP_RELEASABLE, &cgrp->flags);
-                check_for_release(cgrp);
+        if (atomic_dec_return(&css->refcnt) == 1) {
+                if (notify_on_release(cgrp)) {
+                        set_bit(CGRP_RELEASABLE, &cgrp->flags);
+                        check_for_release(cgrp);
+                }
+                cgroup_wakeup_rmdir_waiters(cgrp);
         }
         rcu_read_unlock();
 }
@@ -3239,3 +3378,232 @@ static int __init cgroup_disable(char *str)
         return 1;
 }
 __setup("cgroup_disable=", cgroup_disable);
+
+/*
+ * Functons for CSS ID.
+ */
+
+/*
+ *To get ID other than 0, this should be called when !cgroup_is_removed().
+ */
+unsigned short css_id(struct cgroup_subsys_state *css)
+{
+        struct css_id *cssid = rcu_dereference(css->id);
+
+        if (cssid)
+                return cssid->id;
+        return 0;
+}
+
+unsigned short css_depth(struct cgroup_subsys_state *css)
+{
+        struct css_id *cssid = rcu_dereference(css->id);
+
+        if (cssid)
+                return cssid->depth;
+        return 0;
+}
+
+bool css_is_ancestor(struct cgroup_subsys_state *child,
+                    const struct cgroup_subsys_state *root)
+{
+        struct css_id *child_id = rcu_dereference(child->id);
+        struct css_id *root_id = rcu_dereference(root->id);
+
+        if (!child_id || !root_id || (child_id->depth < root_id->depth))
+                return false;
+        return child_id->stack[root_id->depth] == root_id->id;
+}
+
+static void __free_css_id_cb(struct rcu_head *head)
+{
+        struct css_id *id;
+
+        id = container_of(head, struct css_id, rcu_head);
+        kfree(id);
+}
+
+void free_css_id(struct cgroup_subsys *ss, struct cgroup_subsys_state *css)
+{
+        struct css_id *id = css->id;
+        /* When this is called before css_id initialization, id can be NULL */
+        if (!id)
+                return;
+
+        BUG_ON(!ss->use_id);
+
+        rcu_assign_pointer(id->css, NULL);
+        rcu_assign_pointer(css->id, NULL);
+        spin_lock(&ss->id_lock);
+        idr_remove(&ss->idr, id->id);
+        spin_unlock(&ss->id_lock);
+        call_rcu(&id->rcu_head, __free_css_id_cb);
+}
+
+/*
+ * This is called by init or create(). Then, calls to this function are
+ * always serialized (By cgroup_mutex() at create()).
+ */
+
+static struct css_id *get_new_cssid(struct cgroup_subsys *ss, int depth)
+{
+        struct css_id *newid;
+        int myid, error, size;
+
+        BUG_ON(!ss->use_id);
+
+        size = sizeof(*newid) + sizeof(unsigned short) * (depth + 1);
+        newid = kzalloc(size, GFP_KERNEL);
+        if (!newid)
+                return ERR_PTR(-ENOMEM);
+        /* get id */
+        if (unlikely(!idr_pre_get(&ss->idr, GFP_KERNEL))) {
+                error = -ENOMEM;
+                goto err_out;
+        }
+        spin_lock(&ss->id_lock);
+        /* Don't use 0. allocates an ID of 1-65535 */
+        error = idr_get_new_above(&ss->idr, newid, 1, &myid);
+        spin_unlock(&ss->id_lock);
+
+        /* Returns error when there are no free spaces for new ID.*/
+        if (error) {
+                error = -ENOSPC;
+                goto err_out;
+        }
+        if (myid > CSS_ID_MAX)
+                goto remove_idr;
+
+        newid->id = myid;
+        newid->depth = depth;
+        return newid;
+remove_idr:
+        error = -ENOSPC;
+        spin_lock(&ss->id_lock);
+        idr_remove(&ss->idr, myid);
+        spin_unlock(&ss->id_lock);
+err_out:
+        kfree(newid);
+        return ERR_PTR(error);
+
+}
+
+static int __init cgroup_subsys_init_idr(struct cgroup_subsys *ss)
+{
+        struct css_id *newid;
+        struct cgroup_subsys_state *rootcss;
+
+        spin_lock_init(&ss->id_lock);
+        idr_init(&ss->idr);
+
+        rootcss = init_css_set.subsys[ss->subsys_id];
+        newid = get_new_cssid(ss, 0);
+        if (IS_ERR(newid))
+                return PTR_ERR(newid);
+
+        newid->stack[0] = newid->id;
+        newid->css = rootcss;
+        rootcss->id = newid;
+        return 0;
+}
+
+static int alloc_css_id(struct cgroup_subsys *ss, struct cgroup *parent,
+                        struct cgroup *child)
+{
+        int subsys_id, i, depth = 0;
+        struct cgroup_subsys_state *parent_css, *child_css;
+        struct css_id *child_id, *parent_id = NULL;
+
+        subsys_id = ss->subsys_id;
+        parent_css = parent->subsys[subsys_id];
+        child_css = child->subsys[subsys_id];
+        depth = css_depth(parent_css) + 1;
+        parent_id = parent_css->id;
+
+        child_id = get_new_cssid(ss, depth);
+        if (IS_ERR(child_id))
+                return PTR_ERR(child_id);
+
+        for (i = 0; i < depth; i++)
+                child_id->stack[i] = parent_id->stack[i];
+        child_id->stack[depth] = child_id->id;
+        /*
+         * child_id->css pointer will be set after this cgroup is available
+         * see cgroup_populate_dir()
+         */
+        rcu_assign_pointer(child_css->id, child_id);
+
+        return 0;
+}
+
+/**
+ * css_lookup - lookup css by id
+ * @ss: cgroup subsys to be looked into.
+ * @id: the id
+ *
+ * Returns pointer to cgroup_subsys_state if there is valid one with id.
+ * NULL if not. Should be called under rcu_read_lock()
+ */
+struct cgroup_subsys_state *css_lookup(struct cgroup_subsys *ss, int id)
+{
+        struct css_id *cssid = NULL;
+
+        BUG_ON(!ss->use_id);
+        cssid = idr_find(&ss->idr, id);
+
+        if (unlikely(!cssid))
+                return NULL;
+
+        return rcu_dereference(cssid->css);
+}
+
+/**
+ * css_get_next - lookup next cgroup under specified hierarchy.
+ * @ss: pointer to subsystem
+ * @id: current position of iteration.
+ * @root: pointer to css. search tree under this.
+ * @foundid: position of found object.
+ *
+ * Search next css under the specified hierarchy of rootid. Calling under
+ * rcu_read_lock() is necessary. Returns NULL if it reaches the end.
+ */
+struct cgroup_subsys_state *
+css_get_next(struct cgroup_subsys *ss, int id,
+             struct cgroup_subsys_state *root, int *foundid)
+{
+        struct cgroup_subsys_state *ret = NULL;
+        struct css_id *tmp;
+        int tmpid;
+        int rootid = css_id(root);
+        int depth = css_depth(root);
+
+        if (!rootid)
+                return NULL;
+
+        BUG_ON(!ss->use_id);
+        /* fill start point for scan */
+        tmpid = id;
+        while (1) {
+                /*
+                 * scan next entry from bitmap(tree), tmpid is updated after
+                 * idr_get_next().
+                 */
+                spin_lock(&ss->id_lock);
+                tmp = idr_get_next(&ss->idr, &tmpid);
+                spin_unlock(&ss->id_lock);
+
+                if (!tmp)
+                        break;
+                if (tmp->depth >= depth && tmp->stack[depth] == rootid) {
+                        ret = rcu_dereference(tmp->css);
+                        if (ret) {
+                                *foundid = tmpid;
+                                break;
+                        }
+                }
+                /* continue to scan from next id */
+                tmpid = tmpid + 1;
+        }
+        return ret;
+}
+
diff --git a/kernel/cgroup_debug.c b/kernel/cgroup_debug.c
index daca6209202d..0c92d797baa6 100644
--- a/kernel/cgroup_debug.c
+++ b/kernel/cgroup_debug.c
@@ -40,9 +40,7 @@ static u64 taskcount_read(struct cgroup *cont, struct cftype *cft)
 {
         u64 count;
 
-        cgroup_lock();
         count = cgroup_task_count(cont);
-        cgroup_unlock();
         return count;
 }
 
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 79e40f00dcb8..395b6974dc8d 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -281,7 +281,7 @@ int __ref cpu_down(unsigned int cpu)
                 goto out;
         }
 
-        cpu_clear(cpu, cpu_active_map);
+        set_cpu_active(cpu, false);
 
         /*
          * Make sure the all cpus did the reschedule and are not
@@ -296,7 +296,7 @@ int __ref cpu_down(unsigned int cpu)
         err = _cpu_down(cpu, 0);
 
         if (cpu_online(cpu))
-                cpu_set(cpu, cpu_active_map);
+                set_cpu_active(cpu, true);
 
 out:
         cpu_maps_update_done();
@@ -333,7 +333,7 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
                 goto out_notify;
         BUG_ON(!cpu_online(cpu));
 
-        cpu_set(cpu, cpu_active_map);
+        set_cpu_active(cpu, true);
 
         /* Now call notifier in preparation. */
         raw_notifier_call_chain(&cpu_chain, CPU_ONLINE | mod, hcpu);
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index f76db9dcaa05..026faccca869 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -128,10 +128,6 @@ static inline struct cpuset *task_cs(struct task_struct *task)
         return container_of(task_subsys_state(task, cpuset_subsys_id),
                             struct cpuset, css);
 }
-struct cpuset_hotplug_scanner {
-        struct cgroup_scanner scan;
-        struct cgroup *to;
-};
 
 /* bits in struct cpuset flags field */
 typedef enum {
@@ -521,6 +517,7 @@ static int validate_change(const struct cpuset *cur, const struct cpuset *trial)
         return 0;
 }
 
+#ifdef CONFIG_SMP
 /*
  * Helper routine for generate_sched_domains().
  * Do cpusets a, b have overlapping cpus_allowed masks?
@@ -815,6 +812,18 @@ static void do_rebuild_sched_domains(struct work_struct *unused)
 
         put_online_cpus();
 }
+#else /* !CONFIG_SMP */
+static void do_rebuild_sched_domains(struct work_struct *unused)
+{
+}
+
+static int generate_sched_domains(struct cpumask **domains,
+                        struct sched_domain_attr **attributes)
+{
+        *domains = NULL;
+        return 1;
+}
+#endif /* CONFIG_SMP */
 
 static DECLARE_WORK(rebuild_sched_domains_work, do_rebuild_sched_domains);
 
@@ -1026,101 +1035,70 @@ static void cpuset_migrate_mm(struct mm_struct *mm, const nodemask_t *from,
         mutex_unlock(&callback_mutex);
 }
 
+/*
+ * Rebind task's vmas to cpuset's new mems_allowed, and migrate pages to new
+ * nodes if memory_migrate flag is set. Called with cgroup_mutex held.
+ */
+static void cpuset_change_nodemask(struct task_struct *p,
+                                   struct cgroup_scanner *scan)
+{
+        struct mm_struct *mm;
+        struct cpuset *cs;
+        int migrate;
+        const nodemask_t *oldmem = scan->data;
+
+        mm = get_task_mm(p);
+        if (!mm)
+                return;
+
+        cs = cgroup_cs(scan->cg);
+        migrate = is_memory_migrate(cs);
+
+        mpol_rebind_mm(mm, &cs->mems_allowed);
+        if (migrate)
+                cpuset_migrate_mm(mm, oldmem, &cs->mems_allowed);
+        mmput(mm);
+}
+
 static void *cpuset_being_rebound;
 
 /**
  * update_tasks_nodemask - Update the nodemasks of tasks in the cpuset.
  * @cs: the cpuset in which each task's mems_allowed mask needs to be changed
  * @oldmem: old mems_allowed of cpuset cs
+ * @heap: if NULL, defer allocating heap memory to cgroup_scan_tasks()
  *
  * Called with cgroup_mutex held
- * Return 0 if successful, -errno if not.
+ * No return value. It's guaranteed that cgroup_scan_tasks() always returns 0
+ * if @heap != NULL.
  */
-static int update_tasks_nodemask(struct cpuset *cs, const nodemask_t *oldmem)
+static void update_tasks_nodemask(struct cpuset *cs, const nodemask_t *oldmem,
+                                 struct ptr_heap *heap)
 {
-        struct task_struct *p;
-        struct mm_struct **mmarray;
-        int i, n, ntasks;
-        int migrate;
-        int fudge;
-        struct cgroup_iter it;
-        int retval;
+        struct cgroup_scanner scan;
 
         cpuset_being_rebound = cs;              /* causes mpol_dup() rebind */
 
-        fudge = 10;                             /* spare mmarray[] slots */
-        fudge += cpumask_weight(cs->cpus_allowed);/* imagine 1 fork-bomb/cpu */
-        retval = -ENOMEM;
-
-        /*
-         * Allocate mmarray[] to hold mm reference for each task
-         * in cpuset cs.  Can't kmalloc GFP_KERNEL while holding
-         * tasklist_lock.  We could use GFP_ATOMIC, but with a
-         * few more lines of code, we can retry until we get a big
-         * enough mmarray[] w/o using GFP_ATOMIC.
-         */
-        while (1) {
-                ntasks = cgroup_task_count(cs->css.cgroup);  /* guess */
-                ntasks += fudge;
-                mmarray = kmalloc(ntasks * sizeof(*mmarray), GFP_KERNEL);
-                if (!mmarray)
-                        goto done;
-                read_lock(&tasklist_lock);              /* block fork */
-                if (cgroup_task_count(cs->css.cgroup) <= ntasks)
-                        break;                          /* got enough */
-                read_unlock(&tasklist_lock);            /* try again */
-                kfree(mmarray);
-        }
-
-        n = 0;
-
-        /* Load up mmarray[] with mm reference for each task in cpuset. */
-        cgroup_iter_start(cs->css.cgroup, &it);
-        while ((p = cgroup_iter_next(cs->css.cgroup, &it))) {
-                struct mm_struct *mm;
-
-                if (n >= ntasks) {
-                        printk(KERN_WARNING
-                                "Cpuset mempolicy rebind incomplete.\n");
-                        break;
-                }
-                mm = get_task_mm(p);
-                if (!mm)
-                        continue;
-                mmarray[n++] = mm;
-        }
-        cgroup_iter_end(cs->css.cgroup, &it);
-        read_unlock(&tasklist_lock);
+        scan.cg = cs->css.cgroup;
+        scan.test_task = NULL;
+        scan.process_task = cpuset_change_nodemask;
+        scan.heap = heap;
+        scan.data = (nodemask_t *)oldmem;
 
         /*
-         * Now that we've dropped the tasklist spinlock, we can
-         * rebind the vma mempolicies of each mm in mmarray[] to their
-         * new cpuset, and release that mm.  The mpol_rebind_mm()
-         * call takes mmap_sem, which we couldn't take while holding
-         * tasklist_lock.  Forks can happen again now - the mpol_dup()
-         * cpuset_being_rebound check will catch such forks, and rebind
-         * their vma mempolicies too.  Because we still hold the global
-         * cgroup_mutex, we know that no other rebind effort will
-         * be contending for the global variable cpuset_being_rebound.
+         * The mpol_rebind_mm() call takes mmap_sem, which we couldn't
+         * take while holding tasklist_lock.  Forks can happen - the
+         * mpol_dup() cpuset_being_rebound check will catch such forks,
+         * and rebind their vma mempolicies too.  Because we still hold
+         * the global cgroup_mutex, we know that no other rebind effort
+         * will be contending for the global variable cpuset_being_rebound.
          * It's ok if we rebind the same mm twice; mpol_rebind_mm()
          * is idempotent.  Also migrate pages in each mm to new nodes.
          */
-        migrate = is_memory_migrate(cs);
-        for (i = 0; i < n; i++) {
-                struct mm_struct *mm = mmarray[i];
-
-                mpol_rebind_mm(mm, &cs->mems_allowed);
-                if (migrate)
-                        cpuset_migrate_mm(mm, oldmem, &cs->mems_allowed);
-                mmput(mm);
-        }
+        cgroup_scan_tasks(&scan);
 
         /* We're done rebinding vmas to this cpuset's new mems_allowed. */
-        kfree(mmarray);
         cpuset_being_rebound = NULL;
-        retval = 0;
-done:
-        return retval;
 }
 
 /*
@@ -1141,6 +1119,7 @@ static int update_nodemask(struct cpuset *cs, struct cpuset *trialcs,
 {
         nodemask_t oldmem;
         int retval;
+        struct ptr_heap heap;
 
         /*
          * top_cpuset.mems_allowed tracks node_stats[N_HIGH_MEMORY];
@@ -1175,12 +1154,18 @@ static int update_nodemask(struct cpuset *cs, struct cpuset *trialcs,
         if (retval < 0)
                 goto done;
 
+        retval = heap_init(&heap, PAGE_SIZE, GFP_KERNEL, NULL);
+        if (retval < 0)
+                goto done;
+
         mutex_lock(&callback_mutex);
         cs->mems_allowed = trialcs->mems_allowed;
         cs->mems_generation = cpuset_mems_generation++;
         mutex_unlock(&callback_mutex);
 
-        retval = update_tasks_nodemask(cs, &oldmem);
+        update_tasks_nodemask(cs, &oldmem, &heap);
+
+        heap_free(&heap);
 done:
         return retval;
 }
@@ -1192,8 +1177,10 @@ int current_cpuset_is_being_rebound(void)
 
 static int update_relax_domain_level(struct cpuset *cs, s64 val)
 {
+#ifdef CONFIG_SMP
         if (val < -1 || val >= SD_LV_MAX)
                 return -EINVAL;
+#endif
 
         if (val != cs->relax_domain_level) {
                 cs->relax_domain_level = val;
@@ -1355,19 +1342,22 @@ static int cpuset_can_attach(struct cgroup_subsys *ss,
                              struct cgroup *cont, struct task_struct *tsk)
 {
         struct cpuset *cs = cgroup_cs(cont);
-        int ret = 0;
 
         if (cpumask_empty(cs->cpus_allowed) || nodes_empty(cs->mems_allowed))
                 return -ENOSPC;
 
-        if (tsk->flags & PF_THREAD_BOUND) {
-                mutex_lock(&callback_mutex);
-                if (!cpumask_equal(&tsk->cpus_allowed, cs->cpus_allowed))
-                        ret = -EINVAL;
-                mutex_unlock(&callback_mutex);
-        }
+        /*
+         * Kthreads bound to specific cpus cannot be moved to a new cpuset; we
+         * cannot change their cpu affinity and isolating such threads by their
+         * set of allowed nodes is unnecessary.  Thus, cpusets are not
+         * applicable for such threads.  This prevents checking for success of
+         * set_cpus_allowed_ptr() on all attached tasks before cpus_allowed may
+         * be changed.
+         */
+        if (tsk->flags & PF_THREAD_BOUND)
+                return -EINVAL;
 
-        return ret < 0 ? ret : security_task_setscheduler(tsk, 0, NULL);
+        return security_task_setscheduler(tsk, 0, NULL);
 }
 
 static void cpuset_attach(struct cgroup_subsys *ss,
@@ -1706,6 +1696,7 @@ static struct cftype files[] = {
                 .read_u64 = cpuset_read_u64,
                 .write_u64 = cpuset_write_u64,
                 .private = FILE_MEMORY_PRESSURE,
+                .mode = S_IRUGO,
         },
 
         {
@@ -1913,10 +1904,9 @@ int __init cpuset_init(void)
 static void cpuset_do_move_task(struct task_struct *tsk,
                                 struct cgroup_scanner *scan)
 {
-        struct cpuset_hotplug_scanner *chsp;
+        struct cgroup *new_cgroup = scan->data;
 
-        chsp = container_of(scan, struct cpuset_hotplug_scanner, scan);
-        cgroup_attach_task(chsp->to, tsk);
+        cgroup_attach_task(new_cgroup, tsk);
 }
 
 /**
@@ -1932,15 +1922,15 @@ static void cpuset_do_move_task(struct task_struct *tsk,
  */
 static void move_member_tasks_to_cpuset(struct cpuset *from, struct cpuset *to)
 {
-        struct cpuset_hotplug_scanner scan;
+        struct cgroup_scanner scan;
 
-        scan.scan.cg = from->css.cgroup;
-        scan.scan.test_task = NULL; /* select all tasks in cgroup */
-        scan.scan.process_task = cpuset_do_move_task;
-        scan.scan.heap = NULL;
-        scan.to = to->css.cgroup;
+        scan.cg = from->css.cgroup;
+        scan.test_task = NULL; /* select all tasks in cgroup */
+        scan.process_task = cpuset_do_move_task;
+        scan.heap = NULL;
+        scan.data = to->css.cgroup;
 
-        if (cgroup_scan_tasks(&scan.scan))
+        if (cgroup_scan_tasks(&scan))
                 printk(KERN_ERR "move_member_tasks_to_cpuset: "
                                 "cgroup_scan_tasks failed\n");
 }
@@ -2033,7 +2023,7 @@ static void scan_for_empty_cpusets(struct cpuset *root)
                         remove_tasks_in_empty_cpuset(cp);
                 else {
                         update_tasks_cpumask(cp, NULL);
-                        update_tasks_nodemask(cp, &oldmems);
+                        update_tasks_nodemask(cp, &oldmems, NULL);
                 }
         }
 }
@@ -2069,7 +2059,9 @@ static int cpuset_track_online_cpus(struct notifier_block *unused_nb,
         }
 
         cgroup_lock();
+        mutex_lock(&callback_mutex);
         cpumask_copy(top_cpuset.cpus_allowed, cpu_online_mask);
+        mutex_unlock(&callback_mutex);
         scan_for_empty_cpusets(&top_cpuset);
         ndoms = generate_sched_domains(&doms, &attr);
         cgroup_unlock();
@@ -2092,11 +2084,12 @@ static int cpuset_track_online_nodes(struct notifier_block *self,
         cgroup_lock();
         switch (action) {
         case MEM_ONLINE:
-                top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
-                break;
         case MEM_OFFLINE:
+                mutex_lock(&callback_mutex);
                 top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
-                scan_for_empty_cpusets(&top_cpuset);
+                mutex_unlock(&callback_mutex);
+                if (action == MEM_OFFLINE)
+                        scan_for_empty_cpusets(&top_cpuset);
                 break;
         default:
                 break;
@@ -2206,26 +2199,24 @@ static const struct cpuset *nearest_hardwall_ancestor(const struct cpuset *cs)
 }
 
 /**
- * cpuset_zone_allowed_softwall - Can we allocate on zone z's memory node?
- * @z: is this zone on an allowed node?
+ * cpuset_node_allowed_softwall - Can we allocate on a memory node?
+ * @node: is this an allowed node?
  * @gfp_mask: memory allocation flags
  *
- * If we're in interrupt, yes, we can always allocate.  If
- * __GFP_THISNODE is set, yes, we can always allocate.  If zone
- * z's node is in our tasks mems_allowed, yes.  If it's not a
- * __GFP_HARDWALL request and this zone's nodes is in the nearest
- * hardwalled cpuset ancestor to this tasks cpuset, yes.
- * If the task has been OOM killed and has access to memory reserves
- * as specified by the TIF_MEMDIE flag, yes.
+ * If we're in interrupt, yes, we can always allocate.  If __GFP_THISNODE is
+ * set, yes, we can always allocate.  If node is in our task's mems_allowed,
+ * yes.  If it's not a __GFP_HARDWALL request and this node is in the nearest
+ * hardwalled cpuset ancestor to this task's cpuset, yes.  If the task has been
+ * OOM killed and has access to memory reserves as specified by the TIF_MEMDIE
+ * flag, yes.
  * Otherwise, no.
  *
- * If __GFP_HARDWALL is set, cpuset_zone_allowed_softwall()
- * reduces to cpuset_zone_allowed_hardwall().  Otherwise,
- * cpuset_zone_allowed_softwall() might sleep, and might allow a zone
- * from an enclosing cpuset.
+ * If __GFP_HARDWALL is set, cpuset_node_allowed_softwall() reduces to
+ * cpuset_node_allowed_hardwall().  Otherwise, cpuset_node_allowed_softwall()
+ * might sleep, and might allow a node from an enclosing cpuset.
  *
- * cpuset_zone_allowed_hardwall() only handles the simpler case of
- * hardwall cpusets, and never sleeps.
+ * cpuset_node_allowed_hardwall() only handles the simpler case of hardwall
+ * cpusets, and never sleeps.
  *
  * The __GFP_THISNODE placement logic is really handled elsewhere,
  * by forcibly using a zonelist starting at a specified node, and by
@@ -2264,20 +2255,17 @@ static const struct cpuset *nearest_hardwall_ancestor(const struct cpuset *cs)
  *      GFP_USER     - only nodes in current tasks mems allowed ok.
  *
  * Rule:
- *    Don't call cpuset_zone_allowed_softwall if you can't sleep, unless you
+ *    Don't call cpuset_node_allowed_softwall if you can't sleep, unless you
  *    pass in the __GFP_HARDWALL flag set in gfp_flag, which disables
  *    the code that might scan up ancestor cpusets and sleep.
  */
-
-int __cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
+int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
 {
-        int node;                       /* node that zone z is on */
         const struct cpuset *cs;        /* current cpuset ancestors */
         int allowed;                    /* is allocation in zone z allowed? */
 
         if (in_interrupt() || (gfp_mask & __GFP_THISNODE))
                 return 1;
-        node = zone_to_nid(z);
         might_sleep_if(!(gfp_mask & __GFP_HARDWALL));
         if (node_isset(node, current->mems_allowed))
                 return 1;
@@ -2306,15 +2294,15 @@ int __cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
 }
 
 /*
- * cpuset_zone_allowed_hardwall - Can we allocate on zone z's memory node?
- * @z: is this zone on an allowed node?
+ * cpuset_node_allowed_hardwall - Can we allocate on a memory node?
+ * @node: is this an allowed node?
  * @gfp_mask: memory allocation flags
  *
- * If we're in interrupt, yes, we can always allocate.
- * If __GFP_THISNODE is set, yes, we can always allocate.  If zone
- * z's node is in our tasks mems_allowed, yes.   If the task has been
- * OOM killed and has access to memory reserves as specified by the
- * TIF_MEMDIE flag, yes.  Otherwise, no.
+ * If we're in interrupt, yes, we can always allocate.  If __GFP_THISNODE is
+ * set, yes, we can always allocate.  If node is in our task's mems_allowed,
+ * yes.  If the task has been OOM killed and has access to memory reserves as
+ * specified by the TIF_MEMDIE flag, yes.
+ * Otherwise, no.
  *
  * The __GFP_THISNODE placement logic is really handled elsewhere,
  * by forcibly using a zonelist starting at a specified node, and by
@@ -2322,20 +2310,16 @@ int __cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
  * any node on the zonelist except the first.  By the time any such
  * calls get to this routine, we should just shut up and say 'yes'.
  *
- * Unlike the cpuset_zone_allowed_softwall() variant, above,
- * this variant requires that the zone be in the current tasks
+ * Unlike the cpuset_node_allowed_softwall() variant, above,
+ * this variant requires that the node be in the current task's
  * mems_allowed or that we're in interrupt.  It does not scan up the
  * cpuset hierarchy for the nearest enclosing mem_exclusive cpuset.
  * It never sleeps.
  */
-
-int __cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
+int __cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
 {
-        int node;                       /* node that zone z is on */
-
         if (in_interrupt() || (gfp_mask & __GFP_THISNODE))
                 return 1;
-        node = zone_to_nid(z);
         if (node_isset(node, current->mems_allowed))
                 return 1;
         /*
diff --git a/kernel/exec_domain.c b/kernel/exec_domain.c
index 667c841c2952..c35452cadded 100644
--- a/kernel/exec_domain.c
+++ b/kernel/exec_domain.c
@@ -18,6 +18,7 @@
 #include <linux/syscalls.h>
 #include <linux/sysctl.h>
 #include <linux/types.h>
+#include <linux/fs_struct.h>
 
 
 static void default_handler(int, struct pt_regs *);
@@ -145,28 +146,6 @@ __set_personality(u_long personality)
                 return 0;
         }
 
-        if (atomic_read(&current->fs->count) != 1) {
-                struct fs_struct *fsp, *ofsp;
-
-                fsp = copy_fs_struct(current->fs);
-                if (fsp == NULL) {
-                        module_put(ep->module);
-                        return -ENOMEM;
-                }
-
-                task_lock(current);
-                ofsp = current->fs;
-                current->fs = fsp;
-                task_unlock(current);
-
-                put_fs_struct(ofsp);
-        }
-
-        /*
-         * At that point we are guaranteed to be the sole owner of
-         * current->fs.
-         */
-
         current->personality = personality;
         oep = current_thread_info()->exec_domain;
         current_thread_info()->exec_domain = ep;
diff --git a/kernel/exit.c b/kernel/exit.c
index f80dec3f1875..abf9cf3b95c6 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -46,6 +46,7 @@
 #include <linux/blkdev.h>
 #include <linux/task_io_accounting_ops.h>
 #include <linux/tracehook.h>
+#include <linux/fs_struct.h>
 #include <linux/init_task.h>
 #include <trace/sched.h>
 
@@ -61,11 +62,6 @@ DEFINE_TRACE(sched_process_wait);
 
 static void exit_mm(struct task_struct * tsk);
 
-static inline int task_detached(struct task_struct *p)
-{
-        return p->exit_signal == -1;
-}
-
 static void __unhash_process(struct task_struct *p)
 {
         nr_threads--;
@@ -118,6 +114,8 @@ static void __exit_signal(struct task_struct *tsk)
                  * We won't ever get here for the group leader, since it
                  * will have been the last reference on the signal_struct.
                  */
+                sig->utime = cputime_add(sig->utime, task_utime(tsk));
+                sig->stime = cputime_add(sig->stime, task_stime(tsk));
                 sig->gtime = cputime_add(sig->gtime, task_gtime(tsk));
                 sig->min_flt += tsk->min_flt;
                 sig->maj_flt += tsk->maj_flt;
@@ -126,6 +124,7 @@ static void __exit_signal(struct task_struct *tsk)
                 sig->inblock += task_io_get_inblock(tsk);
                 sig->oublock += task_io_get_oublock(tsk);
                 task_io_accounting_add(&sig->ioac, &tsk->ioac);
+                sig->sum_sched_runtime += tsk->se.sum_exec_runtime;
                 sig = NULL; /* Marker for below. */
         }
 
@@ -359,16 +358,12 @@ static void reparent_to_kthreadd(void)
 void __set_special_pids(struct pid *pid)
 {
         struct task_struct *curr = current->group_leader;
-        pid_t nr = pid_nr(pid);
 
-        if (task_session(curr) != pid) {
+        if (task_session(curr) != pid)
                 change_pid(curr, PIDTYPE_SID, pid);
-                set_task_session(curr, nr);
-        }
-        if (task_pgrp(curr) != pid) {
+
+        if (task_pgrp(curr) != pid)
                 change_pid(curr, PIDTYPE_PGID, pid);
-                set_task_pgrp(curr, nr);
-        }
 }
 
 static void set_special_pids(struct pid *pid)
@@ -426,7 +421,6 @@ EXPORT_SYMBOL(disallow_signal);
 void daemonize(const char *name, ...)
 {
         va_list args;
-        struct fs_struct *fs;
         sigset_t blocked;
 
         va_start(args, name);
@@ -459,11 +453,7 @@ void daemonize(const char *name, ...)
 
         /* Become as one with the init task */
 
-        exit_fs(current);       /* current->fs->count--; */
-        fs = init_task.fs;
-        current->fs = fs;
-        atomic_inc(&fs->count);
-
+        daemonize_fs_struct();
         exit_files(current);
         current->files = init_task.files;
         atomic_inc(&current->files->count);
@@ -562,30 +552,6 @@ void exit_files(struct task_struct *tsk)
         }
 }
 
-void put_fs_struct(struct fs_struct *fs)
-{
-        /* No need to hold fs->lock if we are killing it */
-        if (atomic_dec_and_test(&fs->count)) {
-                path_put(&fs->root);
-                path_put(&fs->pwd);
-                kmem_cache_free(fs_cachep, fs);
-        }
-}
-
-void exit_fs(struct task_struct *tsk)
-{
-        struct fs_struct * fs = tsk->fs;
-
-        if (fs) {
-                task_lock(tsk);
-                tsk->fs = NULL;
-                task_unlock(tsk);
-                put_fs_struct(fs);
-        }
-}
-
-EXPORT_SYMBOL_GPL(exit_fs);
-
 #ifdef CONFIG_MM_OWNER
 /*
  * Task p is exiting and it owned mm, lets find a new owner for it
@@ -729,119 +695,6 @@ static void exit_mm(struct task_struct * tsk)
 }
 
 /*
- * Return nonzero if @parent's children should reap themselves.
- *
- * Called with write_lock_irq(&tasklist_lock) held.
- */
-static int ignoring_children(struct task_struct *parent)
-{
-        int ret;
-        struct sighand_struct *psig = parent->sighand;
-        unsigned long flags;
-        spin_lock_irqsave(&psig->siglock, flags);
-        ret = (psig->action[SIGCHLD-1].sa.sa_handler == SIG_IGN ||
-               (psig->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT));
-        spin_unlock_irqrestore(&psig->siglock, flags);
-        return ret;
-}
-
-/*
- * Detach all tasks we were using ptrace on.
- * Any that need to be release_task'd are put on the @dead list.
- *
- * Called with write_lock(&tasklist_lock) held.
- */
-static void ptrace_exit(struct task_struct *parent, struct list_head *dead)
-{
-        struct task_struct *p, *n;
-        int ign = -1;
-
-        list_for_each_entry_safe(p, n, &parent->ptraced, ptrace_entry) {
-                __ptrace_unlink(p);
-
-                if (p->exit_state != EXIT_ZOMBIE)
-                        continue;
-
-                /*
-                 * If it's a zombie, our attachedness prevented normal
-                 * parent notification or self-reaping.  Do notification
-                 * now if it would have happened earlier.  If it should
-                 * reap itself, add it to the @dead list.  We can't call
-                 * release_task() here because we already hold tasklist_lock.
-                 *
-                 * If it's our own child, there is no notification to do.
-                 * But if our normal children self-reap, then this child
-                 * was prevented by ptrace and we must reap it now.
-                 */
-                if (!task_detached(p) && thread_group_empty(p)) {
-                        if (!same_thread_group(p->real_parent, parent))
-                                do_notify_parent(p, p->exit_signal);
-                        else {
-                                if (ign < 0)
-                                        ign = ignoring_children(parent);
-                                if (ign)
-                                        p->exit_signal = -1;
-                        }
-                }
-
-                if (task_detached(p)) {
-                        /*
-                         * Mark it as in the process of being reaped.
-                         */
-                        p->exit_state = EXIT_DEAD;
-                        list_add(&p->ptrace_entry, dead);
-                }
-        }
-}
-
-/*
- * Finish up exit-time ptrace cleanup.
- *
- * Called without locks.
- */
-static void ptrace_exit_finish(struct task_struct *parent,
-                               struct list_head *dead)
-{
-        struct task_struct *p, *n;
-
-        BUG_ON(!list_empty(&parent->ptraced));
-
-        list_for_each_entry_safe(p, n, dead, ptrace_entry) {
-                list_del_init(&p->ptrace_entry);
-                release_task(p);
-        }
-}
-
-static void reparent_thread(struct task_struct *p, struct task_struct *father)
-{
-        if (p->pdeath_signal)
-                /* We already hold the tasklist_lock here.  */
-                group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p);
-
-        list_move_tail(&p->sibling, &p->real_parent->children);
-
-        /* If this is a threaded reparent there is no need to
-         * notify anyone anything has happened.
-         */
-        if (same_thread_group(p->real_parent, father))
-                return;
-
-        /* We don't want people slaying init.  */
-        if (!task_detached(p))
-                p->exit_signal = SIGCHLD;
-
-        /* If we'd notified the old parent about this child's death,
-         * also notify the new parent.
-         */
-        if (!ptrace_reparented(p) &&
-            p->exit_state == EXIT_ZOMBIE &&
-            !task_detached(p) && thread_group_empty(p))
-                do_notify_parent(p, p->exit_signal);
-
-        kill_orphaned_pgrp(p, father);
-}
-
-/*
  * When we die, we re-parent all our children.
  * Try to give them to another thread in our thread
  * group, and if no such member exists, give it to
@@ -880,17 +733,51 @@ static struct task_struct *find_new_reaper(struct task_struct *father)
         return pid_ns->child_reaper;
 }
 
+/*
+* Any that need to be release_task'd are put on the @dead list.
+ */
+static void reparent_thread(struct task_struct *father, struct task_struct *p,
+                                struct list_head *dead)
+{
+        if (p->pdeath_signal)
+                group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p);
+
+        list_move_tail(&p->sibling, &p->real_parent->children);
+
+        if (task_detached(p))
+                return;
+        /*
+         * If this is a threaded reparent there is no need to
+         * notify anyone anything has happened.
+         */
+        if (same_thread_group(p->real_parent, father))
+                return;
+
+        /* We don't want people slaying init.  */
+        p->exit_signal = SIGCHLD;
+
+        /* If it has exited notify the new parent about this child's death. */
+        if (!p->ptrace &&
+            p->exit_state == EXIT_ZOMBIE && thread_group_empty(p)) {
+                do_notify_parent(p, p->exit_signal);
+                if (task_detached(p)) {
+                        p->exit_state = EXIT_DEAD;
+                        list_move_tail(&p->sibling, dead);
+                }
+        }
+
+        kill_orphaned_pgrp(p, father);
+}
+
 static void forget_original_parent(struct task_struct *father)
 {
         struct task_struct *p, *n, *reaper;
-        LIST_HEAD(ptrace_dead);
+        LIST_HEAD(dead_children);
+
+        exit_ptrace(father);
 
         write_lock_irq(&tasklist_lock);
         reaper = find_new_reaper(father);
-        /*
-         * First clean up ptrace if we were using it.
-         */
-        ptrace_exit(father, &ptrace_dead);
 
         list_for_each_entry_safe(p, n, &father->children, sibling) {
                 p->real_parent = reaper;
@@ -898,13 +785,16 @@ static void forget_original_parent(struct task_struct *father)
                         BUG_ON(p->ptrace);
                         p->parent = p->real_parent;
                 }
-                reparent_thread(p, father);
+                reparent_thread(father, p, &dead_children);
         }
-
         write_unlock_irq(&tasklist_lock);
+
         BUG_ON(!list_empty(&father->children));
 
-        ptrace_exit_finish(father, &ptrace_dead);
+        list_for_each_entry_safe(p, n, &dead_children, sibling) {
+                list_del_init(&p->sibling);
+                release_task(p);
+        }
 }
 
 /*
@@ -947,8 +837,7 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
          */
         if (tsk->exit_signal != SIGCHLD && !task_detached(tsk) &&
             (tsk->parent_exec_id != tsk->real_parent->self_exec_id ||
-             tsk->self_exec_id != tsk->parent_exec_id) &&
-            !capable(CAP_KILL))
+             tsk->self_exec_id != tsk->parent_exec_id))
                 tsk->exit_signal = SIGCHLD;
 
         signal = tracehook_notify_death(tsk, &cookie, group_dead);
@@ -977,12 +866,9 @@ static void check_stack_usage(void)
 {
         static DEFINE_SPINLOCK(low_water_lock);
         static int lowest_to_date = THREAD_SIZE;
-        unsigned long *n = end_of_stack(current);
         unsigned long free;
 
-        while (*n == 0)
-                n++;
-        free = (unsigned long)n - (unsigned long)end_of_stack(current);
+        free = stack_not_used(current);
 
         if (free >= lowest_to_date)
                 return;
@@ -1037,6 +923,8 @@ NORET_TYPE void do_exit(long code)
                 schedule();
         }
 
+        exit_irq_thread();
+
         exit_signals(tsk);  /* sets PF_EXITING */
         /*
          * tsk->flags are checked in the futex code to protect against
@@ -1417,6 +1305,18 @@ static int wait_task_zombie(struct task_struct *p, int options,
         return retval;
 }
 
+static int *task_stopped_code(struct task_struct *p, bool ptrace)
+{
+        if (ptrace) {
+                if (task_is_stopped_or_traced(p))
+                        return &p->exit_code;
+        } else {
+                if (p->signal->flags & SIGNAL_STOP_STOPPED)
+                        return &p->signal->group_exit_code;
+        }
+        return NULL;
+}
+
 /*
  * Handle sys_wait4 work for one task in state TASK_STOPPED.  We hold
  * read_lock(&tasklist_lock) on entry.  If we return zero, we still hold
@@ -1427,7 +1327,7 @@ static int wait_task_stopped(int ptrace, struct task_struct *p,
                              int options, struct siginfo __user *infop,
                              int __user *stat_addr, struct rusage __user *ru)
 {
-        int retval, exit_code, why;
+        int retval, exit_code, *p_code, why;
         uid_t uid = 0; /* unneeded, required by compiler */
         pid_t pid;
 
@@ -1437,22 +1337,16 @@ static int wait_task_stopped(int ptrace, struct task_struct *p,
         exit_code = 0;
         spin_lock_irq(&p->sighand->siglock);
 
-        if (unlikely(!task_is_stopped_or_traced(p)))
-                goto unlock_sig;
-
-        if (!ptrace && p->signal->group_stop_count > 0)
-                /*
-                 * A group stop is in progress and this is the group leader.
-                 * We won't report until all threads have stopped.
-                 */
+        p_code = task_stopped_code(p, ptrace);
+        if (unlikely(!p_code))
                 goto unlock_sig;
 
-        exit_code = p->exit_code;
+        exit_code = *p_code;
         if (!exit_code)
                 goto unlock_sig;
 
         if (!unlikely(options & WNOWAIT))
-                p->exit_code = 0;
+                *p_code = 0;
 
         /* don't need the RCU readlock here as we're holding a spinlock */
         uid = __task_cred(p)->uid;
@@ -1608,7 +1502,7 @@ static int wait_consider_task(struct task_struct *parent, int ptrace,
          */
         *notask_error = 0;
 
-        if (task_is_stopped_or_traced(p))
+        if (task_stopped_code(p, ptrace))
                 return wait_task_stopped(ptrace, p, options,
                                          infop, stat_addr, ru);
 
@@ -1812,7 +1706,7 @@ SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr,
                 pid = find_get_pid(-upid);
         } else if (upid == 0) {
                 type = PIDTYPE_PGID;
-                pid = get_pid(task_pgrp(current));
+                pid = get_task_pid(current, PIDTYPE_PGID);
         } else /* upid > 0 */ {
                 type = PIDTYPE_PID;
                 pid = find_get_pid(upid);
diff --git a/kernel/extable.c b/kernel/extable.c
index e136ed8d82ba..7f8f263f8524 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -15,11 +15,22 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
+#include <linux/ftrace.h>
+#include <linux/memory.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/init.h>
-#include <linux/ftrace.h>
-#include <asm/uaccess.h>
+
 #include <asm/sections.h>
+#include <asm/uaccess.h>
+
+/*
+ * mutex protecting text section modification (dynamic code patching).
+ * some users need to sleep (allocating memory...) while they hold this lock.
+ *
+ * NOT exported to modules - patching kernel text is a really delicate matter.
+ */
+DEFINE_MUTEX(text_mutex);
 
 extern struct exception_table_entry __start___ex_table[];
 extern struct exception_table_entry __stop___ex_table[];
@@ -41,31 +52,50 @@ const struct exception_table_entry *search_exception_tables(unsigned long addr)
         return e;
 }
 
-__notrace_funcgraph int core_kernel_text(unsigned long addr)
+static inline int init_kernel_text(unsigned long addr)
+{
+        if (addr >= (unsigned long)_sinittext &&
+            addr <= (unsigned long)_einittext)
+                return 1;
+        return 0;
+}
+
+int core_kernel_text(unsigned long addr)
 {
         if (addr >= (unsigned long)_stext &&
             addr <= (unsigned long)_etext)
                 return 1;
 
         if (system_state == SYSTEM_BOOTING &&
-            addr >= (unsigned long)_sinittext &&
-            addr <= (unsigned long)_einittext)
+            init_kernel_text(addr))
                 return 1;
         return 0;
 }
 
-__notrace_funcgraph int __kernel_text_address(unsigned long addr)
+int __kernel_text_address(unsigned long addr)
 {
         if (core_kernel_text(addr))
                 return 1;
-        return __module_text_address(addr) != NULL;
+        if (is_module_text_address(addr))
+                return 1;
+        /*
+         * There might be init symbols in saved stacktraces.
+         * Give those symbols a chance to be printed in
+         * backtraces (such as lockdep traces).
+         *
+         * Since we are after the module-symbols check, there's
+         * no danger of address overlap:
+         */
+        if (init_kernel_text(addr))
+                return 1;
+        return 0;
 }
 
 int kernel_text_address(unsigned long addr)
 {
         if (core_kernel_text(addr))
                 return 1;
-        return module_text_address(addr) != NULL;
+        return is_module_text_address(addr);
 }
 
 /*
@@ -81,5 +111,5 @@ int func_ptr_is_kernel_text(void *ptr)
         addr = (unsigned long) dereference_function_descriptor(ptr);
         if (core_kernel_text(addr))
                 return 1;
-        return module_text_address(addr) != NULL;
+        return is_module_text_address(addr);
 }
diff --git a/kernel/fork.c b/kernel/fork.c
index 6d5dbb7a13e2..989c7c202b3d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -60,7 +60,9 @@
 #include <linux/tty.h>
 #include <linux/proc_fs.h>
 #include <linux/blkdev.h>
+#include <linux/fs_struct.h>
 #include <trace/sched.h>
+#include <linux/magic.h>
 
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
@@ -212,6 +214,8 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
 {
         struct task_struct *tsk;
         struct thread_info *ti;
+        unsigned long *stackend;
+
         int err;
 
         prepare_to_copy(orig);
@@ -237,6 +241,8 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
                 goto out;
 
         setup_thread_stack(tsk, orig);
+        stackend = end_of_stack(tsk);
+        *stackend = STACK_END_MAGIC;    /* for overflow detection */
 
 #ifdef CONFIG_CC_STACKPROTECTOR
         tsk->stack_canary = get_random_int();
@@ -279,7 +285,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
         mm->free_area_cache = oldmm->mmap_base;
         mm->cached_hole_size = ~0UL;
         mm->map_count = 0;
-        cpus_clear(mm->cpu_vm_mask);
+        cpumask_clear(mm_cpumask(mm));
         mm->mm_rb = RB_ROOT;
         rb_link = &mm->mm_rb.rb_node;
         rb_parent = NULL;
@@ -639,6 +645,9 @@ static int copy_mm(unsigned long clone_flags, struct task_struct * tsk)
 
         tsk->min_flt = tsk->maj_flt = 0;
         tsk->nvcsw = tsk->nivcsw = 0;
+#ifdef CONFIG_DETECT_HUNG_TASK
+        tsk->last_switch_count = tsk->nvcsw + tsk->nivcsw;
+#endif
 
         tsk->mm = NULL;
         tsk->active_mm = NULL;
@@ -676,38 +685,21 @@ fail_nomem:
         return retval;
 }
 
-static struct fs_struct *__copy_fs_struct(struct fs_struct *old)
-{
-        struct fs_struct *fs = kmem_cache_alloc(fs_cachep, GFP_KERNEL);
-        /* We don't need to lock fs - think why ;-) */
-        if (fs) {
-                atomic_set(&fs->count, 1);
-                rwlock_init(&fs->lock);
-                fs->umask = old->umask;
-                read_lock(&old->lock);
-                fs->root = old->root;
-                path_get(&old->root);
-                fs->pwd = old->pwd;
-                path_get(&old->pwd);
-                read_unlock(&old->lock);
-        }
-        return fs;
-}
-
-struct fs_struct *copy_fs_struct(struct fs_struct *old)
-{
-        return __copy_fs_struct(old);
-}
-
-EXPORT_SYMBOL_GPL(copy_fs_struct);
-
 static int copy_fs(unsigned long clone_flags, struct task_struct *tsk)
 {
+        struct fs_struct *fs = current->fs;
         if (clone_flags & CLONE_FS) {
-                atomic_inc(&current->fs->count);
+                /* tsk->fs is already what we want */
+                write_lock(&fs->lock);
+                if (fs->in_exec) {
+                        write_unlock(&fs->lock);
+                        return -EAGAIN;
+                }
+                fs->users++;
+                write_unlock(&fs->lock);
                 return 0;
         }
-        tsk->fs = __copy_fs_struct(current->fs);
+        tsk->fs = copy_fs_struct(fs);
         if (!tsk->fs)
                 return -ENOMEM;
         return 0;
@@ -836,6 +828,8 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
         atomic_set(&sig->live, 1);
         init_waitqueue_head(&sig->wait_chldexit);
         sig->flags = 0;
+        if (clone_flags & CLONE_NEWPID)
+                sig->flags |= SIGNAL_UNKILLABLE;
         sig->group_exit_code = 0;
         sig->group_exit_task = NULL;
         sig->group_stop_count = 0;
@@ -851,13 +845,14 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
         sig->tty_old_pgrp = NULL;
         sig->tty = NULL;
 
-        sig->cutime = sig->cstime = cputime_zero;
+        sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
         sig->gtime = cputime_zero;
         sig->cgtime = cputime_zero;
         sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
         sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
         sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0;
         task_io_accounting_init(&sig->ioac);
+        sig->sum_sched_runtime = 0;
         taskstats_tgid_init(sig);
 
         task_lock(current->group_leader);
@@ -1040,11 +1035,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 
         p->default_timer_slack_ns = current->timer_slack_ns;
 
-#ifdef CONFIG_DETECT_SOFTLOCKUP
-        p->last_switch_count = 0;
-        p->last_switch_timestamp = 0;
-#endif
-
         task_io_accounting_init(&p->ioac);
         acct_clear_integrals(p);
 
@@ -1094,7 +1084,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #ifdef CONFIG_DEBUG_MUTEXES
         p->blocked_on = NULL; /* not blocked yet */
 #endif
-        if (unlikely(ptrace_reparented(current)))
+        if (unlikely(current->ptrace))
                 ptrace_fork(p, clone_flags);
 
         /* Perform scheduler related setup. Assign this task to a CPU. */
@@ -1119,7 +1109,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 goto bad_fork_cleanup_mm;
         if ((retval = copy_io(clone_flags, p)))
                 goto bad_fork_cleanup_namespaces;
-        retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs);
+        retval = copy_thread(clone_flags, stack_start, stack_size, p, regs);
         if (retval)
                 goto bad_fork_cleanup_io;
 
@@ -1178,10 +1168,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #endif
         clear_all_latency_tracing(p);
 
-        /* Our parent execution domain becomes current domain
-           These must match for thread signalling to apply */
-        p->parent_exec_id = p->self_exec_id;
-
         /* ok, now we should be set up.. */
         p->exit_signal = (clone_flags & CLONE_THREAD) ? -1 : (clone_flags & CSIGNAL);
         p->pdeath_signal = 0;
@@ -1219,10 +1205,13 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 set_task_cpu(p, smp_processor_id());
 
         /* CLONE_PARENT re-uses the old parent */
-        if (clone_flags & (CLONE_PARENT|CLONE_THREAD))
+        if (clone_flags & (CLONE_PARENT|CLONE_THREAD)) {
                 p->real_parent = current->real_parent;
-        else
+                p->parent_exec_id = current->parent_exec_id;
+        } else {
                 p->real_parent = current;
+                p->parent_exec_id = current->self_exec_id;
+        }
 
         spin_lock(&current->sighand->siglock);
 
@@ -1258,8 +1247,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                         p->signal->leader_pid = pid;
                         tty_kref_put(p->signal->tty);
                         p->signal->tty = tty_kref_get(current->signal->tty);
-                        set_task_pgrp(p, task_pgrp_nr(current));
-                        set_task_session(p, task_session_nr(current));
                         attach_pid(p, PIDTYPE_PGID, task_pgrp(current));
                         attach_pid(p, PIDTYPE_SID, task_session(current));
                         list_add_tail_rcu(&p->tasks, &init_task.tasks);
@@ -1483,6 +1470,7 @@ void __init proc_caches_init(void)
         mm_cachep = kmem_cache_create("mm_struct",
                         sizeof(struct mm_struct), ARCH_MIN_MMSTRUCT_ALIGN,
                         SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+        vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC);
         mmap_init();
 }
 
@@ -1538,12 +1526,16 @@ static int unshare_fs(unsigned long unshare_flags, struct fs_struct **new_fsp)
 {
         struct fs_struct *fs = current->fs;
 
-        if ((unshare_flags & CLONE_FS) &&
-            (fs && atomic_read(&fs->count) > 1)) {
-                *new_fsp = __copy_fs_struct(current->fs);
-                if (!*new_fsp)
-                        return -ENOMEM;
-        }
+        if (!(unshare_flags & CLONE_FS) || !fs)
+                return 0;
+
+        /* don't need lock here; in the worst case we'll do useless copy */
+        if (fs->users == 1)
+                return 0;
+
+        *new_fsp = copy_fs_struct(fs);
+        if (!*new_fsp)
+                return -ENOMEM;
 
         return 0;
 }
@@ -1659,8 +1651,13 @@ SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags)
 
                 if (new_fs) {
                         fs = current->fs;
+                        write_lock(&fs->lock);
                         current->fs = new_fs;
-                        new_fs = fs;
+                        if (--fs->users)
+                                new_fs = NULL;
+                        else
+                                new_fs = fs;
+                        write_unlock(&fs->lock);
                 }
 
                 if (new_mm) {
@@ -1699,7 +1696,7 @@ bad_unshare_cleanup_sigh:
 
 bad_unshare_cleanup_fs:
         if (new_fs)
-                put_fs_struct(new_fs);
+                free_fs_struct(new_fs);
 
 bad_unshare_cleanup_thread:
 bad_unshare_out:
diff --git a/kernel/futex.c b/kernel/futex.c
index f89d373a9c6d..6b50a024bca2 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -114,7 +114,9 @@ struct futex_q {
 };
 
 /*
- * Split the global futex_lock into every hash list lock.
+ * Hash buckets are shared by all the futex_keys that hash to the same
+ * location.  Each key may have multiple futex_q structures, one for each task
+ * waiting on a futex.
  */
 struct futex_hash_bucket {
         spinlock_t lock;
@@ -189,8 +191,7 @@ static void drop_futex_key_refs(union futex_key *key)
 /**
  * get_futex_key - Get parameters which are the keys for a futex.
  * @uaddr: virtual address of the futex
- * @shared: NULL for a PROCESS_PRIVATE futex,
- *      &current->mm->mmap_sem for a PROCESS_SHARED futex
+ * @fshared: 0 for a PROCESS_PRIVATE futex, 1 for PROCESS_SHARED
  * @key: address where result is stored.
  *
  * Returns a negative error code or 0
@@ -200,9 +201,7 @@ static void drop_futex_key_refs(union futex_key *key)
  * offset_within_page).  For private mappings, it's (uaddr, current->mm).
  * We can usually work out the index without swapping in the page.
  *
- * fshared is NULL for PROCESS_PRIVATE futexes
- * For other futexes, it points to &current->mm->mmap_sem and
- * caller must have taken the reader lock. but NOT any spinlocks.
+ * lock_page() might sleep, the caller should not hold a spinlock.
  */
 static int get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key)
 {
@@ -299,41 +298,6 @@ static int get_futex_value_locked(u32 *dest, u32 __user *from)
         return ret ? -EFAULT : 0;
 }
 
-/*
- * Fault handling.
- */
-static int futex_handle_fault(unsigned long address, int attempt)
-{
-        struct vm_area_struct * vma;
-        struct mm_struct *mm = current->mm;
-        int ret = -EFAULT;
-
-        if (attempt > 2)
-                return ret;
-
-        down_read(&mm->mmap_sem);
-        vma = find_vma(mm, address);
-        if (vma && address >= vma->vm_start &&
-            (vma->vm_flags & VM_WRITE)) {
-                int fault;
-                fault = handle_mm_fault(mm, vma, address, 1);
-                if (unlikely((fault & VM_FAULT_ERROR))) {
-#if 0
-                        /* XXX: let's do this when we verify it is OK */
-                        if (ret & VM_FAULT_OOM)
-                                ret = -ENOMEM;
-#endif
-                } else {
-                        ret = 0;
-                        if (fault & VM_FAULT_MAJOR)
-                                current->maj_flt++;
-                        else
-                                current->min_flt++;
-                }
-        }
-        up_read(&mm->mmap_sem);
-        return ret;
-}
 
 /*
  * PI code:
@@ -589,10 +553,9 @@ static void wake_futex(struct futex_q *q)
          * The waiting task can free the futex_q as soon as this is written,
          * without taking any locks.  This must come last.
          *
-         * A memory barrier is required here to prevent the following store
-         * to lock_ptr from getting ahead of the wakeup. Clearing the lock
-         * at the end of wake_up_all() does not prevent this store from
-         * moving.
+         * A memory barrier is required here to prevent the following store to
+         * lock_ptr from getting ahead of the wakeup. Clearing the lock at the
+         * end of wake_up() does not prevent this store from moving.
          */
         smp_wmb();
         q->lock_ptr = NULL;
@@ -692,9 +655,16 @@ double_lock_hb(struct futex_hash_bucket *hb1, struct futex_hash_bucket *hb2)
         }
 }
 
+static inline void
+double_unlock_hb(struct futex_hash_bucket *hb1, struct futex_hash_bucket *hb2)
+{
+        spin_unlock(&hb1->lock);
+        if (hb1 != hb2)
+                spin_unlock(&hb2->lock);
+}
+
 /*
- * Wake up all waiters hashed on the physical page that is mapped
- * to this virtual address:
+ * Wake up waiters matching bitset queued on this futex (uaddr).
  */
 static int futex_wake(u32 __user *uaddr, int fshared, int nr_wake, u32 bitset)
 {
@@ -750,9 +720,9 @@ futex_wake_op(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
         struct futex_hash_bucket *hb1, *hb2;
         struct plist_head *head;
         struct futex_q *this, *next;
-        int ret, op_ret, attempt = 0;
+        int ret, op_ret;
 
-retryfull:
+retry:
         ret = get_futex_key(uaddr1, fshared, &key1);
         if (unlikely(ret != 0))
                 goto out;
@@ -763,16 +733,13 @@ retryfull:
         hb1 = hash_futex(&key1);
         hb2 = hash_futex(&key2);
 
-retry:
         double_lock_hb(hb1, hb2);
-
+retry_private:
         op_ret = futex_atomic_op_inuser(op, uaddr2);
         if (unlikely(op_ret < 0)) {
                 u32 dummy;
 
-                spin_unlock(&hb1->lock);
-                if (hb1 != hb2)
-                        spin_unlock(&hb2->lock);
+                double_unlock_hb(hb1, hb2);
 
 #ifndef CONFIG_MMU
                 /*
@@ -788,26 +755,16 @@ retry:
                         goto out_put_keys;
                 }
 
-                /*
-                 * futex_atomic_op_inuser needs to both read and write
-                 * *(int __user *)uaddr2, but we can't modify it
-                 * non-atomically.  Therefore, if get_user below is not
-                 * enough, we need to handle the fault ourselves, while
-                 * still holding the mmap_sem.
-                 */
-                if (attempt++) {
-                        ret = futex_handle_fault((unsigned long)uaddr2,
-                                                 attempt);
-                        if (ret)
-                                goto out_put_keys;
-                        goto retry;
-                }
-
                 ret = get_user(dummy, uaddr2);
                 if (ret)
-                        return ret;
+                        goto out_put_keys;
+
+                if (!fshared)
+                        goto retry_private;
 
-                goto retryfull;
+                put_futex_key(fshared, &key2);
+                put_futex_key(fshared, &key1);
+                goto retry;
         }
 
         head = &hb1->chain;
@@ -834,9 +791,7 @@ retry:
                 ret += op_ret;
         }
 
-        spin_unlock(&hb1->lock);
-        if (hb1 != hb2)
-                spin_unlock(&hb2->lock);
+        double_unlock_hb(hb1, hb2);
 out_put_keys:
         put_futex_key(fshared, &key2);
 out_put_key1:
@@ -869,6 +824,7 @@ retry:
         hb1 = hash_futex(&key1);
         hb2 = hash_futex(&key2);
 
+retry_private:
         double_lock_hb(hb1, hb2);
 
         if (likely(cmpval != NULL)) {
@@ -877,16 +833,18 @@ retry:
                 ret = get_futex_value_locked(&curval, uaddr1);
 
                 if (unlikely(ret)) {
-                        spin_unlock(&hb1->lock);
-                        if (hb1 != hb2)
-                                spin_unlock(&hb2->lock);
+                        double_unlock_hb(hb1, hb2);
 
                         ret = get_user(curval, uaddr1);
+                        if (ret)
+                                goto out_put_keys;
 
-                        if (!ret)
-                                goto retry;
+                        if (!fshared)
+                                goto retry_private;
 
-                        goto out_put_keys;
+                        put_futex_key(fshared, &key2);
+                        put_futex_key(fshared, &key1);
+                        goto retry;
                 }
                 if (curval != *cmpval) {
                         ret = -EAGAIN;
@@ -923,9 +881,7 @@ retry:
         }
 
 out_unlock:
-        spin_unlock(&hb1->lock);
-        if (hb1 != hb2)
-                spin_unlock(&hb2->lock);
+        double_unlock_hb(hb1, hb2);
 
         /* drop_futex_key_refs() must be called outside the spinlocks. */
         while (--drop_count >= 0)
@@ -1063,7 +1019,7 @@ static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
         struct futex_pi_state *pi_state = q->pi_state;
         struct task_struct *oldowner = pi_state->owner;
         u32 uval, curval, newval;
-        int ret, attempt = 0;
+        int ret;
 
         /* Owner died? */
         if (!pi_state->owner)
@@ -1076,11 +1032,9 @@ static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
          * in the user space variable. This must be atomic as we have
          * to preserve the owner died bit here.
          *
-         * Note: We write the user space value _before_ changing the
-         * pi_state because we can fault here. Imagine swapped out
-         * pages or a fork, which was running right before we acquired
-         * mmap_sem, that marked all the anonymous memory readonly for
-         * cow.
+         * Note: We write the user space value _before_ changing the pi_state
+         * because we can fault here. Imagine swapped out pages or a fork
+         * that marked all the anonymous memory readonly for cow.
          *
          * Modifying pi_state _before_ the user space value would
          * leave the pi_state in an inconsistent state when we fault
@@ -1136,7 +1090,7 @@ retry:
 handle_fault:
         spin_unlock(q->lock_ptr);
 
-        ret = futex_handle_fault((unsigned long)uaddr, attempt++);
+        ret = get_user(uval, uaddr);
 
         spin_lock(q->lock_ptr);
 
@@ -1165,6 +1119,7 @@ static int futex_wait(u32 __user *uaddr, int fshared,
                       u32 val, ktime_t *abs_time, u32 bitset, int clockrt)
 {
         struct task_struct *curr = current;
+        struct restart_block *restart;
         DECLARE_WAITQUEUE(wait, curr);
         struct futex_hash_bucket *hb;
         struct futex_q q;
@@ -1184,10 +1139,11 @@ retry:
         if (unlikely(ret != 0))
                 goto out;
 
+retry_private:
         hb = queue_lock(&q);
 
         /*
-         * Access the page AFTER the futex is queued.
+         * Access the page AFTER the hash-bucket is locked.
          * Order is important:
          *
          *   Userspace waiter: val = var; if (cond(val)) futex_wait(&var, val);
@@ -1203,24 +1159,29 @@ retry:
          * a wakeup when *uaddr != val on entry to the syscall.  This is
          * rare, but normal.
          *
-         * for shared futexes, we hold the mmap semaphore, so the mapping
+         * For shared futexes, we hold the mmap semaphore, so the mapping
          * cannot have changed since we looked it up in get_futex_key.
          */
         ret = get_futex_value_locked(&uval, uaddr);
 
         if (unlikely(ret)) {
                 queue_unlock(&q, hb);
-                put_futex_key(fshared, &q.key);
 
                 ret = get_user(uval, uaddr);
+                if (ret)
+                        goto out_put_key;
 
-                if (!ret)
-                        goto retry;
-                return ret;
+                if (!fshared)
+                        goto retry_private;
+
+                put_futex_key(fshared, &q.key);
+                goto retry;
         }
         ret = -EWOULDBLOCK;
-        if (uval != val)
-                goto out_unlock_put_key;
+        if (unlikely(uval != val)) {
+                queue_unlock(&q, hb);
+                goto out_put_key;
+        }
 
         /* Only actually queue if *uaddr contained val.  */
         queue_me(&q, hb);
@@ -1245,16 +1206,13 @@ retry:
                 if (!abs_time)
                         schedule();
                 else {
-                        unsigned long slack;
-                        slack = current->timer_slack_ns;
-                        if (rt_task(current))
-                                slack = 0;
                         hrtimer_init_on_stack(&t.timer,
                                               clockrt ? CLOCK_REALTIME :
                                               CLOCK_MONOTONIC,
                                               HRTIMER_MODE_ABS);
                         hrtimer_init_sleeper(&t, current);
-                        hrtimer_set_expires_range_ns(&t.timer, *abs_time, slack);
+                        hrtimer_set_expires_range_ns(&t.timer, *abs_time,
+                                                     current->timer_slack_ns);
 
                         hrtimer_start_expires(&t.timer, HRTIMER_MODE_ABS);
                         if (!hrtimer_active(&t.timer))
@@ -1284,38 +1242,38 @@ retry:
          */
 
         /* If we were woken (and unqueued), we succeeded, whatever. */
+        ret = 0;
         if (!unqueue_me(&q))
-                return 0;
+                goto out_put_key;
+        ret = -ETIMEDOUT;
         if (rem)
-                return -ETIMEDOUT;
+                goto out_put_key;
 
         /*
          * We expect signal_pending(current), but another thread may
          * have handled it for us already.
          */
+        ret = -ERESTARTSYS;
         if (!abs_time)
-                return -ERESTARTSYS;
-        else {
-                struct restart_block *restart;
-                restart = &current_thread_info()->restart_block;
-                restart->fn = futex_wait_restart;
-                restart->futex.uaddr = (u32 *)uaddr;
-                restart->futex.val = val;
-                restart->futex.time = abs_time->tv64;
-                restart->futex.bitset = bitset;
-                restart->futex.flags = 0;
-
-                if (fshared)
-                        restart->futex.flags |= FLAGS_SHARED;
-                if (clockrt)
-                        restart->futex.flags |= FLAGS_CLOCKRT;
-                return -ERESTART_RESTARTBLOCK;
-        }
+                goto out_put_key;
 
-out_unlock_put_key:
-        queue_unlock(&q, hb);
-        put_futex_key(fshared, &q.key);
+        restart = &current_thread_info()->restart_block;
+        restart->fn = futex_wait_restart;
+        restart->futex.uaddr = (u32 *)uaddr;
+        restart->futex.val = val;
+        restart->futex.time = abs_time->tv64;
+        restart->futex.bitset = bitset;
+        restart->futex.flags = 0;
+
+        if (fshared)
+                restart->futex.flags |= FLAGS_SHARED;
+        if (clockrt)
+                restart->futex.flags |= FLAGS_CLOCKRT;
+
+        ret = -ERESTART_RESTARTBLOCK;
 
+out_put_key:
+        put_futex_key(fshared, &q.key);
 out:
         return ret;
 }
@@ -1351,7 +1309,7 @@ static int futex_lock_pi(u32 __user *uaddr, int fshared,
         struct futex_hash_bucket *hb;
         u32 uval, newval, curval;
         struct futex_q q;
-        int ret, lock_taken, ownerdied = 0, attempt = 0;
+        int ret, lock_taken, ownerdied = 0;
 
         if (refill_pi_state_cache())
                 return -ENOMEM;
@@ -1371,7 +1329,7 @@ retry:
         if (unlikely(ret != 0))
                 goto out;
 
-retry_unlocked:
+retry_private:
         hb = queue_lock(&q);
 
 retry_locked:
@@ -1455,6 +1413,7 @@ retry_locked:
                          * exit to complete.
                          */
                         queue_unlock(&q, hb);
+                        put_futex_key(fshared, &q.key);
                         cond_resched();
                         goto retry;
 
@@ -1561,6 +1520,13 @@ retry_locked:
                 }
         }
 
+        /*
+         * If fixup_pi_state_owner() faulted and was unable to handle the
+         * fault, unlock it and return the fault to userspace.
+         */
+        if (ret && (rt_mutex_owner(&q.pi_state->pi_mutex) == current))
+                rt_mutex_unlock(&q.pi_state->pi_mutex);
+
         /* Unqueue and drop the lock */
         unqueue_me_pi(&q);
 
@@ -1588,22 +1554,18 @@ uaddr_faulted:
          */
         queue_unlock(&q, hb);
 
-        if (attempt++) {
-                ret = futex_handle_fault((unsigned long)uaddr, attempt);
-                if (ret)
-                        goto out_put_key;
-                goto retry_unlocked;
-        }
-
         ret = get_user(uval, uaddr);
-        if (!ret)
-                goto retry;
+        if (ret)
+                goto out_put_key;
 
-        if (to)
-                destroy_hrtimer_on_stack(&to->timer);
-        return ret;
+        if (!fshared)
+                goto retry_private;
+
+        put_futex_key(fshared, &q.key);
+        goto retry;
 }
 
+
 /*
  * Userspace attempted a TID -> 0 atomic transition, and failed.
  * This is the in-kernel slowpath: we look up the PI state (if any),
@@ -1616,7 +1578,7 @@ static int futex_unlock_pi(u32 __user *uaddr, int fshared)
         u32 uval;
         struct plist_head *head;
         union futex_key key = FUTEX_KEY_INIT;
-        int ret, attempt = 0;
+        int ret;
 
 retry:
         if (get_user(uval, uaddr))
@@ -1632,7 +1594,6 @@ retry:
                 goto out;
 
         hb = hash_futex(&key);
-retry_unlocked:
         spin_lock(&hb->lock);
 
         /*
@@ -1697,14 +1658,7 @@ pi_faulted:
          * we have to drop the mmap_sem in order to call get_user().
          */
         spin_unlock(&hb->lock);
-
-        if (attempt++) {
-                ret = futex_handle_fault((unsigned long)uaddr, attempt);
-                if (ret)
-                        goto out;
-                uval = 0;
-                goto retry_unlocked;
-        }
+        put_futex_key(fshared, &key);
 
         ret = get_user(uval, uaddr);
         if (!ret)
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index f394d2a42ca3..cb8a15c19583 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -651,14 +651,20 @@ static inline void hrtimer_init_timer_hres(struct hrtimer *timer)
  * and expiry check is done in the hrtimer_interrupt or in the softirq.
  */
 static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
-                                            struct hrtimer_clock_base *base)
+                                            struct hrtimer_clock_base *base,
+                                            int wakeup)
 {
         if (base->cpu_base->hres_active && hrtimer_reprogram(timer, base)) {
-                spin_unlock(&base->cpu_base->lock);
-                raise_softirq_irqoff(HRTIMER_SOFTIRQ);
-                spin_lock(&base->cpu_base->lock);
+                if (wakeup) {
+                        spin_unlock(&base->cpu_base->lock);
+                        raise_softirq_irqoff(HRTIMER_SOFTIRQ);
+                        spin_lock(&base->cpu_base->lock);
+                } else
+                        __raise_softirq_irqoff(HRTIMER_SOFTIRQ);
+
                 return 1;
         }
+
         return 0;
 }
 
@@ -703,7 +709,8 @@ static inline int hrtimer_is_hres_enabled(void) { return 0; }
 static inline int hrtimer_switch_to_hres(void) { return 0; }
 static inline void hrtimer_force_reprogram(struct hrtimer_cpu_base *base) { }
 static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
-                                            struct hrtimer_clock_base *base)
+                                            struct hrtimer_clock_base *base,
+                                            int wakeup)
 {
         return 0;
 }
@@ -886,20 +893,9 @@ remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base)
         return 0;
 }
 
-/**
- * hrtimer_start_range_ns - (re)start an hrtimer on the current CPU
- * @timer:      the timer to be added
- * @tim:        expiry time
- * @delta_ns:   "slack" range for the timer
- * @mode:       expiry mode: absolute (HRTIMER_ABS) or relative (HRTIMER_REL)
- *
- * Returns:
- *  0 on success
- *  1 when the timer was active
- */
-int
-hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, unsigned long delta_ns,
-                        const enum hrtimer_mode mode)
+int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
+                unsigned long delta_ns, const enum hrtimer_mode mode,
+                int wakeup)
 {
         struct hrtimer_clock_base *base, *new_base;
         unsigned long flags;
@@ -940,12 +936,29 @@ hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, unsigned long delta_n
          * XXX send_remote_softirq() ?
          */
         if (leftmost && new_base->cpu_base == &__get_cpu_var(hrtimer_bases))
-                hrtimer_enqueue_reprogram(timer, new_base);
+                hrtimer_enqueue_reprogram(timer, new_base, wakeup);
 
         unlock_hrtimer_base(timer, &flags);
 
         return ret;
 }
+
+/**
+ * hrtimer_start_range_ns - (re)start an hrtimer on the current CPU
+ * @timer:      the timer to be added
+ * @tim:        expiry time
+ * @delta_ns:   "slack" range for the timer
+ * @mode:       expiry mode: absolute (HRTIMER_ABS) or relative (HRTIMER_REL)
+ *
+ * Returns:
+ *  0 on success
+ *  1 when the timer was active
+ */
+int hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
+                unsigned long delta_ns, const enum hrtimer_mode mode)
+{
+        return __hrtimer_start_range_ns(timer, tim, delta_ns, mode, 1);
+}
 EXPORT_SYMBOL_GPL(hrtimer_start_range_ns);
 
 /**
@@ -961,7 +974,7 @@ EXPORT_SYMBOL_GPL(hrtimer_start_range_ns);
 int
 hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
 {
-        return hrtimer_start_range_ns(timer, tim, 0, mode);
+        return __hrtimer_start_range_ns(timer, tim, 0, mode, 1);
 }
 EXPORT_SYMBOL_GPL(hrtimer_start);
 
diff --git a/kernel/hung_task.c b/kernel/hung_task.c
new file mode 100644
index 000000000000..022a4927b785
--- /dev/null
+++ b/kernel/hung_task.c
@@ -0,0 +1,217 @@
+/*
+ * Detect Hung Task
+ *
+ * kernel/hung_task.c - kernel thread for detecting tasks stuck in D state
+ *
+ */
+
+#include <linux/mm.h>
+#include <linux/cpu.h>
+#include <linux/nmi.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/freezer.h>
+#include <linux/kthread.h>
+#include <linux/lockdep.h>
+#include <linux/module.h>
+#include <linux/sysctl.h>
+
+/*
+ * The number of tasks checked:
+ */
+unsigned long __read_mostly sysctl_hung_task_check_count = PID_MAX_LIMIT;
+
+/*
+ * Limit number of tasks checked in a batch.
+ *
+ * This value controls the preemptibility of khungtaskd since preemption
+ * is disabled during the critical section. It also controls the size of
+ * the RCU grace period. So it needs to be upper-bound.
+ */
+#define HUNG_TASK_BATCHING 1024
+
+/*
+ * Zero means infinite timeout - no checking done:
+ */
+unsigned long __read_mostly sysctl_hung_task_timeout_secs = 120;
+
+unsigned long __read_mostly sysctl_hung_task_warnings = 10;
+
+static int __read_mostly did_panic;
+
+static struct task_struct *watchdog_task;
+
+/*
+ * Should we panic (and reboot, if panic_timeout= is set) when a
+ * hung task is detected:
+ */
+unsigned int __read_mostly sysctl_hung_task_panic =
+                                CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE;
+
+static int __init hung_task_panic_setup(char *str)
+{
+        sysctl_hung_task_panic = simple_strtoul(str, NULL, 0);
+
+        return 1;
+}
+__setup("hung_task_panic=", hung_task_panic_setup);
+
+static int
+hung_task_panic(struct notifier_block *this, unsigned long event, void *ptr)
+{
+        did_panic = 1;
+
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block panic_block = {
+        .notifier_call = hung_task_panic,
+};
+
+static void check_hung_task(struct task_struct *t, unsigned long timeout)
+{
+        unsigned long switch_count = t->nvcsw + t->nivcsw;
+
+        /*
+         * Ensure the task is not frozen.
+         * Also, when a freshly created task is scheduled once, changes
+         * its state to TASK_UNINTERRUPTIBLE without having ever been
+         * switched out once, it musn't be checked.
+         */
+        if (unlikely(t->flags & PF_FROZEN || !switch_count))
+                return;
+
+        if (switch_count != t->last_switch_count) {
+                t->last_switch_count = switch_count;
+                return;
+        }
+        if (!sysctl_hung_task_warnings)
+                return;
+        sysctl_hung_task_warnings--;
+
+        /*
+         * Ok, the task did not get scheduled for more than 2 minutes,
+         * complain:
+         */
+        printk(KERN_ERR "INFO: task %s:%d blocked for more than "
+                        "%ld seconds.\n", t->comm, t->pid, timeout);
+        printk(KERN_ERR "\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\""
+                        " disables this message.\n");
+        sched_show_task(t);
+        __debug_show_held_locks(t);
+
+        touch_nmi_watchdog();
+
+        if (sysctl_hung_task_panic)
+                panic("hung_task: blocked tasks");
+}
+
+/*
+ * To avoid extending the RCU grace period for an unbounded amount of time,
+ * periodically exit the critical section and enter a new one.
+ *
+ * For preemptible RCU it is sufficient to call rcu_read_unlock in order
+ * exit the grace period. For classic RCU, a reschedule is required.
+ */
+static void rcu_lock_break(struct task_struct *g, struct task_struct *t)
+{
+        get_task_struct(g);
+        get_task_struct(t);
+        rcu_read_unlock();
+        cond_resched();
+        rcu_read_lock();
+        put_task_struct(t);
+        put_task_struct(g);
+}
+
+/*
+ * Check whether a TASK_UNINTERRUPTIBLE does not get woken up for
+ * a really long time (120 seconds). If that happens, print out
+ * a warning.
+ */
+static void check_hung_uninterruptible_tasks(unsigned long timeout)
+{
+        int max_count = sysctl_hung_task_check_count;
+        int batch_count = HUNG_TASK_BATCHING;
+        struct task_struct *g, *t;
+
+        /*
+         * If the system crashed already then all bets are off,
+         * do not report extra hung tasks:
+         */
+        if (test_taint(TAINT_DIE) || did_panic)
+                return;
+
+        rcu_read_lock();
+        do_each_thread(g, t) {
+                if (!--max_count)
+                        goto unlock;
+                if (!--batch_count) {
+                        batch_count = HUNG_TASK_BATCHING;
+                        rcu_lock_break(g, t);
+                        /* Exit if t or g was unhashed during refresh. */
+                        if (t->state == TASK_DEAD || g->state == TASK_DEAD)
+                                goto unlock;
+                }
+                /* use "==" to skip the TASK_KILLABLE tasks waiting on NFS */
+                if (t->state == TASK_UNINTERRUPTIBLE)
+                        check_hung_task(t, timeout);
+        } while_each_thread(g, t);
+ unlock:
+        rcu_read_unlock();
+}
+
+static unsigned long timeout_jiffies(unsigned long timeout)
+{
+        /* timeout of 0 will disable the watchdog */
+        return timeout ? timeout * HZ : MAX_SCHEDULE_TIMEOUT;
+}
+
+/*
+ * Process updating of timeout sysctl
+ */
+int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
+                                  struct file *filp, void __user *buffer,
+                                  size_t *lenp, loff_t *ppos)
+{
+        int ret;
+
+        ret = proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos);
+
+        if (ret || !write)
+                goto out;
+
+        wake_up_process(watchdog_task);
+
+ out:
+        return ret;
+}
+
+/*
+ * kthread which checks for tasks stuck in D state
+ */
+static int watchdog(void *dummy)
+{
+        set_user_nice(current, 0);
+
+        for ( ; ; ) {
+                unsigned long timeout = sysctl_hung_task_timeout_secs;
+
+                while (schedule_timeout_interruptible(timeout_jiffies(timeout)))
+                        timeout = sysctl_hung_task_timeout_secs;
+
+                check_hung_uninterruptible_tasks(timeout);
+        }
+
+        return 0;
+}
+
+static int __init hung_task_init(void)
+{
+        atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
+        watchdog_task = kthread_run(watchdog, NULL, "khungtaskd");
+
+        return 0;
+}
+
+module_init(hung_task_init);
diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile
index 4dd5b1edac98..3394f8f52964 100644
--- a/kernel/irq/Makefile
+++ b/kernel/irq/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
 obj-$(CONFIG_PROC_FS) += proc.o
 obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o
 obj-$(CONFIG_NUMA_MIGRATE_IRQ_DESC) += numa_migrate.o
+obj-$(CONFIG_PM_SLEEP) += pm.o
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 7de11bd64dfe..c687ba4363f2 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -46,7 +46,10 @@ void dynamic_irq_init(unsigned int irq)
         desc->irq_count = 0;
         desc->irqs_unhandled = 0;
 #ifdef CONFIG_SMP
-        cpumask_setall(&desc->affinity);
+        cpumask_setall(desc->affinity);
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+        cpumask_clear(desc->pending_mask);
+#endif
 #endif
         spin_unlock_irqrestore(&desc->lock, flags);
 }
@@ -78,6 +81,7 @@ void dynamic_irq_cleanup(unsigned int irq)
         desc->handle_irq = handle_bad_irq;
         desc->chip = &no_irq_chip;
         desc->name = NULL;
+        clear_kstat_irqs(desc);
         spin_unlock_irqrestore(&desc->lock, flags);
 }
 
@@ -290,7 +294,8 @@ static inline void mask_ack_irq(struct irq_desc *desc, int irq)
                 desc->chip->mask_ack(irq);
         else {
                 desc->chip->mask(irq);
-                desc->chip->ack(irq);
+                if (desc->chip->ack)
+                        desc->chip->ack(irq);
         }
 }
 
@@ -476,7 +481,8 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
         kstat_incr_irqs_this_cpu(irq, desc);
 
         /* Start handling the irq */
-        desc->chip->ack(irq);
+        if (desc->chip->ack)
+                desc->chip->ack(irq);
         desc = irq_remap_to_desc(irq, desc);
 
         /* Mark the IRQ currently in progress.*/
diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
index 38a25b8d8bff..d06df9c41cba 100644
--- a/kernel/irq/devres.c
+++ b/kernel/irq/devres.c
@@ -26,10 +26,12 @@ static int devm_irq_match(struct device *dev, void *res, void *data)
 }
 
 /**
- *      devm_request_irq - allocate an interrupt line for a managed device
+ *      devm_request_threaded_irq - allocate an interrupt line for a managed device
  *      @dev: device to request interrupt for
  *      @irq: Interrupt line to allocate
  *      @handler: Function to be called when the IRQ occurs
+ *      @thread_fn: function to be called in a threaded interrupt context. NULL
+ *                  for devices which handle everything in @handler
  *      @irqflags: Interrupt type flags
  *      @devname: An ascii name for the claiming device
  *      @dev_id: A cookie passed back to the handler function
@@ -42,9 +44,10 @@ static int devm_irq_match(struct device *dev, void *res, void *data)
  *      If an IRQ allocated with this function needs to be freed
  *      separately, dev_free_irq() must be used.
  */
-int devm_request_irq(struct device *dev, unsigned int irq,
-                     irq_handler_t handler, unsigned long irqflags,
-                     const char *devname, void *dev_id)
+int devm_request_threaded_irq(struct device *dev, unsigned int irq,
+                              irq_handler_t handler, irq_handler_t thread_fn,
+                              unsigned long irqflags, const char *devname,
+                              void *dev_id)
 {
         struct irq_devres *dr;
         int rc;
@@ -54,7 +57,8 @@ int devm_request_irq(struct device *dev, unsigned int irq,
         if (!dr)
                 return -ENOMEM;
 
-        rc = request_irq(irq, handler, irqflags, devname, dev_id);
+        rc = request_threaded_irq(irq, handler, thread_fn, irqflags, devname,
+                                  dev_id);
         if (rc) {
                 devres_free(dr);
                 return rc;
@@ -66,7 +70,7 @@ int devm_request_irq(struct device *dev, unsigned int irq,
 
         return 0;
 }
-EXPORT_SYMBOL(devm_request_irq);
+EXPORT_SYMBOL(devm_request_threaded_irq);
 
 /**
  *      devm_free_irq - free an interrupt
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 3aba8d12f328..d82142be8dd2 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -17,6 +17,8 @@
 #include <linux/kernel_stat.h>
 #include <linux/rculist.h>
 #include <linux/hash.h>
+#include <trace/irq.h>
+#include <linux/bootmem.h>
 
 #include "internals.h"
 
@@ -69,6 +71,7 @@ int nr_irqs = NR_IRQS;
 EXPORT_SYMBOL_GPL(nr_irqs);
 
 #ifdef CONFIG_SPARSE_IRQ
+
 static struct irq_desc irq_desc_init = {
         .irq        = -1,
         .status     = IRQ_DISABLED,
@@ -76,26 +79,25 @@ static struct irq_desc irq_desc_init = {
         .handle_irq = handle_bad_irq,
         .depth      = 1,
         .lock       = __SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
-#ifdef CONFIG_SMP
-        .affinity   = CPU_MASK_ALL
-#endif
 };
 
 void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr)
 {
-        unsigned long bytes;
-        char *ptr;
         int node;
-
-        /* Compute how many bytes we need per irq and allocate them */
-        bytes = nr * sizeof(unsigned int);
+        void *ptr;
 
         node = cpu_to_node(cpu);
-        ptr = kzalloc_node(bytes, GFP_ATOMIC, node);
-        printk(KERN_DEBUG "  alloc kstat_irqs on cpu %d node %d\n", cpu, node);
+        ptr = kzalloc_node(nr * sizeof(*desc->kstat_irqs), GFP_ATOMIC, node);
 
-        if (ptr)
-                desc->kstat_irqs = (unsigned int *)ptr;
+        /*
+         * don't overwite if can not get new one
+         * init_copy_kstat_irqs() could still use old one
+         */
+        if (ptr) {
+                printk(KERN_DEBUG "  alloc kstat_irqs on cpu %d node %d\n",
+                         cpu, node);
+                desc->kstat_irqs = ptr;
+        }
 }
 
 static void init_one_irq_desc(int irq, struct irq_desc *desc, int cpu)
@@ -113,6 +115,10 @@ static void init_one_irq_desc(int irq, struct irq_desc *desc, int cpu)
                 printk(KERN_ERR "can not alloc kstat_irqs\n");
                 BUG_ON(1);
         }
+        if (!init_alloc_desc_masks(desc, cpu, false)) {
+                printk(KERN_ERR "can not alloc irq_desc cpumasks\n");
+                BUG_ON(1);
+        }
         arch_init_chip_data(desc, cpu);
 }
 
@@ -121,7 +127,7 @@ static void init_one_irq_desc(int irq, struct irq_desc *desc, int cpu)
  */
 DEFINE_SPINLOCK(sparse_irq_lock);
 
-struct irq_desc *irq_desc_ptrs[NR_IRQS] __read_mostly;
+struct irq_desc **irq_desc_ptrs __read_mostly;
 
 static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = {
         [0 ... NR_IRQS_LEGACY-1] = {
@@ -131,14 +137,10 @@ static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_sm
                 .handle_irq = handle_bad_irq,
                 .depth      = 1,
                 .lock       = __SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
-#ifdef CONFIG_SMP
-                .affinity   = CPU_MASK_ALL
-#endif
         }
 };
 
-/* FIXME: use bootmem alloc ...*/
-static unsigned int kstat_irqs_legacy[NR_IRQS_LEGACY][NR_CPUS];
+static unsigned int *kstat_irqs_legacy;
 
 int __init early_irq_init(void)
 {
@@ -148,18 +150,30 @@ int __init early_irq_init(void)
 
         init_irq_default_affinity();
 
+         /* initialize nr_irqs based on nr_cpu_ids */
+        arch_probe_nr_irqs();
+        printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d\n", NR_IRQS, nr_irqs);
+
         desc = irq_desc_legacy;
         legacy_count = ARRAY_SIZE(irq_desc_legacy);
 
+        /* allocate irq_desc_ptrs array based on nr_irqs */
+        irq_desc_ptrs = alloc_bootmem(nr_irqs * sizeof(void *));
+
+        /* allocate based on nr_cpu_ids */
+        /* FIXME: invert kstat_irgs, and it'd be a per_cpu_alloc'd thing */
+        kstat_irqs_legacy = alloc_bootmem(NR_IRQS_LEGACY * nr_cpu_ids *
+                                          sizeof(int));
+
         for (i = 0; i < legacy_count; i++) {
                 desc[i].irq = i;
-                desc[i].kstat_irqs = kstat_irqs_legacy[i];
+                desc[i].kstat_irqs = kstat_irqs_legacy + i * nr_cpu_ids;
                 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
-
+                init_alloc_desc_masks(&desc[i], 0, true);
                 irq_desc_ptrs[i] = desc + i;
         }
 
-        for (i = legacy_count; i < NR_IRQS; i++)
+        for (i = legacy_count; i < nr_irqs; i++)
                 irq_desc_ptrs[i] = NULL;
 
         return arch_early_irq_init();
@@ -167,7 +181,10 @@ int __init early_irq_init(void)
 
 struct irq_desc *irq_to_desc(unsigned int irq)
 {
-        return (irq < NR_IRQS) ? irq_desc_ptrs[irq] : NULL;
+        if (irq_desc_ptrs && irq < nr_irqs)
+                return irq_desc_ptrs[irq];
+
+        return NULL;
 }
 
 struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
@@ -176,10 +193,9 @@ struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
         unsigned long flags;
         int node;
 
-        if (irq >= NR_IRQS) {
-                printk(KERN_WARNING "irq >= NR_IRQS in irq_to_desc_alloc: %d %d\n",
-                                irq, NR_IRQS);
-                WARN_ON(1);
+        if (irq >= nr_irqs) {
+                WARN(1, "irq (%d) >= nr_irqs (%d) in irq_to_desc_alloc\n",
+                        irq, nr_irqs);
                 return NULL;
         }
 
@@ -221,12 +237,10 @@ struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
                 .handle_irq = handle_bad_irq,
                 .depth = 1,
                 .lock = __SPIN_LOCK_UNLOCKED(irq_desc->lock),
-#ifdef CONFIG_SMP
-                .affinity = CPU_MASK_ALL
-#endif
         }
 };
 
+static unsigned int kstat_irqs_all[NR_IRQS][NR_CPUS];
 int __init early_irq_init(void)
 {
         struct irq_desc *desc;
@@ -235,12 +249,16 @@ int __init early_irq_init(void)
 
         init_irq_default_affinity();
 
+        printk(KERN_INFO "NR_IRQS:%d\n", NR_IRQS);
+
         desc = irq_desc;
         count = ARRAY_SIZE(irq_desc);
 
-        for (i = 0; i < count; i++)
+        for (i = 0; i < count; i++) {
                 desc[i].irq = i;
-
+                init_alloc_desc_masks(&desc[i], 0, true);
+                desc[i].kstat_irqs = kstat_irqs_all[i];
+        }
         return arch_early_irq_init();
 }
 
@@ -255,6 +273,11 @@ struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
 }
 #endif /* !CONFIG_SPARSE_IRQ */
 
+void clear_kstat_irqs(struct irq_desc *desc)
+{
+        memset(desc->kstat_irqs, 0, nr_cpu_ids * sizeof(*(desc->kstat_irqs)));
+}
+
 /*
  * What should we do if we get a hw irq event on an illegal vector?
  * Each architecture has to answer this themself.
@@ -316,6 +339,18 @@ irqreturn_t no_action(int cpl, void *dev_id)
         return IRQ_NONE;
 }
 
+static void warn_no_thread(unsigned int irq, struct irqaction *action)
+{
+        if (test_and_set_bit(IRQTF_WARNED, &action->thread_flags))
+                return;
+
+        printk(KERN_WARNING "IRQ %d device %s returned IRQ_WAKE_THREAD "
+               "but no thread function available.", irq, action->name);
+}
+
+DEFINE_TRACE(irq_handler_entry);
+DEFINE_TRACE(irq_handler_exit);
+
 /**
  * handle_IRQ_event - irq action chain handler
  * @irq:        the interrupt number
@@ -328,13 +363,56 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
         irqreturn_t ret, retval = IRQ_NONE;
         unsigned int status = 0;
 
+        WARN_ONCE(!in_irq(), "BUG: IRQ handler called from non-hardirq context!");
+
         if (!(action->flags & IRQF_DISABLED))
                 local_irq_enable_in_hardirq();
 
         do {
+                trace_irq_handler_entry(irq, action);
                 ret = action->handler(irq, action->dev_id);
-                if (ret == IRQ_HANDLED)
+                trace_irq_handler_exit(irq, action, ret);
+
+                switch (ret) {
+                case IRQ_WAKE_THREAD:
+                        /*
+                         * Set result to handled so the spurious check
+                         * does not trigger.
+                         */
+                        ret = IRQ_HANDLED;
+
+                        /*
+                         * Catch drivers which return WAKE_THREAD but
+                         * did not set up a thread function
+                         */
+                        if (unlikely(!action->thread_fn)) {
+                                warn_no_thread(irq, action);
+                                break;
+                        }
+
+                        /*
+                         * Wake up the handler thread for this
+                         * action. In case the thread crashed and was
+                         * killed we just pretend that we handled the
+                         * interrupt. The hardirq handler above has
+                         * disabled the device interrupt, so no irq
+                         * storm is lurking.
+                         */
+                        if (likely(!test_bit(IRQTF_DIED,
+                                             &action->thread_flags))) {
+                                set_bit(IRQTF_RUNTHREAD, &action->thread_flags);
+                                wake_up_process(action->thread);
+                        }
+
+                        /* Fall through to add to randomness */
+                case IRQ_HANDLED:
                         status |= action->flags;
+                        break;
+
+                default:
+                        break;
+                }
+
                 retval |= ret;
                 action = action->next;
         } while (action);
@@ -347,6 +425,11 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
 }
 
 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
+
+#ifdef CONFIG_ENABLE_WARN_DEPRECATED
+# warning __do_IRQ is deprecated. Please convert to proper flow handlers
+#endif
+
 /**
  * __do_IRQ - original all in one highlevel IRQ handler
  * @irq:        the interrupt number
@@ -467,12 +550,10 @@ void early_init_irq_lock_class(void)
         }
 }
 
-#ifdef CONFIG_SPARSE_IRQ
 unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
 {
         struct irq_desc *desc = irq_to_desc(irq);
         return desc ? desc->kstat_irqs[cpu] : 0;
 }
-#endif
 EXPORT_SYMBOL(kstat_irqs_cpu);
 
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index e6d0a43cc125..01ce20eab38f 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -12,11 +12,21 @@ extern void compat_irq_chip_set_default_handler(struct irq_desc *desc);
 
 extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
                 unsigned long flags);
+extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
+extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
 
 extern struct lock_class_key irq_desc_lock_class;
 extern void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr);
+extern void clear_kstat_irqs(struct irq_desc *desc);
 extern spinlock_t sparse_irq_lock;
+
+#ifdef CONFIG_SPARSE_IRQ
+/* irq_desc_ptrs allocated at boot time */
+extern struct irq_desc **irq_desc_ptrs;
+#else
+/* irq_desc_ptrs is a fixed size array */
 extern struct irq_desc *irq_desc_ptrs[NR_IRQS];
+#endif
 
 #ifdef CONFIG_PROC_FS
 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 291f03664552..7e2e7dd4cd2f 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -8,16 +8,15 @@
  */
 
 #include <linux/irq.h>
+#include <linux/kthread.h>
 #include <linux/module.h>
 #include <linux/random.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
+#include <linux/sched.h>
 
 #include "internals.h"
 
-#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
-cpumask_var_t irq_default_affinity;
-
 /**
  *      synchronize_irq - wait for pending IRQ handlers (on other CPUs)
  *      @irq: interrupt number to wait for
@@ -53,9 +52,18 @@ void synchronize_irq(unsigned int irq)
 
                 /* Oops, that failed? */
         } while (status & IRQ_INPROGRESS);
+
+        /*
+         * We made sure that no hardirq handler is running. Now verify
+         * that no threaded handlers are active.
+         */
+        wait_event(desc->wait_for_threads, !atomic_read(&desc->threads_active));
 }
 EXPORT_SYMBOL(synchronize_irq);
 
+#ifdef CONFIG_SMP
+cpumask_var_t irq_default_affinity;
+
 /**
  *      irq_can_set_affinity - Check if the affinity of a given irq can be set
  *      @irq:           Interrupt to check
@@ -72,6 +80,18 @@ int irq_can_set_affinity(unsigned int irq)
         return 1;
 }
 
+static void
+irq_set_thread_affinity(struct irq_desc *desc, const struct cpumask *cpumask)
+{
+        struct irqaction *action = desc->action;
+
+        while (action) {
+                if (action->thread)
+                        set_cpus_allowed_ptr(action->thread, cpumask);
+                action = action->next;
+        }
+}
+
 /**
  *      irq_set_affinity - Set the irq affinity of a given irq
  *      @irq:           Interrupt to set affinity
@@ -90,16 +110,17 @@ int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
 
 #ifdef CONFIG_GENERIC_PENDING_IRQ
         if (desc->status & IRQ_MOVE_PCNTXT || desc->status & IRQ_DISABLED) {
-                cpumask_copy(&desc->affinity, cpumask);
+                cpumask_copy(desc->affinity, cpumask);
                 desc->chip->set_affinity(irq, cpumask);
         } else {
                 desc->status |= IRQ_MOVE_PENDING;
-                cpumask_copy(&desc->pending_mask, cpumask);
+                cpumask_copy(desc->pending_mask, cpumask);
         }
 #else
-        cpumask_copy(&desc->affinity, cpumask);
+        cpumask_copy(desc->affinity, cpumask);
         desc->chip->set_affinity(irq, cpumask);
 #endif
+        irq_set_thread_affinity(desc, cpumask);
         desc->status |= IRQ_AFFINITY_SET;
         spin_unlock_irqrestore(&desc->lock, flags);
         return 0;
@@ -109,7 +130,7 @@ int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
 /*
  * Generic version of the affinity autoselector.
  */
-int do_irq_select_affinity(unsigned int irq, struct irq_desc *desc)
+static int setup_affinity(unsigned int irq, struct irq_desc *desc)
 {
         if (!irq_can_set_affinity(irq))
                 return 0;
@@ -119,21 +140,21 @@ int do_irq_select_affinity(unsigned int irq, struct irq_desc *desc)
          * one of the targets is online.
          */
         if (desc->status & (IRQ_AFFINITY_SET | IRQ_NO_BALANCING)) {
-                if (cpumask_any_and(&desc->affinity, cpu_online_mask)
+                if (cpumask_any_and(desc->affinity, cpu_online_mask)
                     < nr_cpu_ids)
                         goto set_affinity;
                 else
                         desc->status &= ~IRQ_AFFINITY_SET;
         }
 
-        cpumask_and(&desc->affinity, cpu_online_mask, irq_default_affinity);
+        cpumask_and(desc->affinity, cpu_online_mask, irq_default_affinity);
 set_affinity:
-        desc->chip->set_affinity(irq, &desc->affinity);
+        desc->chip->set_affinity(irq, desc->affinity);
 
         return 0;
 }
 #else
-static inline int do_irq_select_affinity(unsigned int irq, struct irq_desc *d)
+static inline int setup_affinity(unsigned int irq, struct irq_desc *d)
 {
         return irq_select_affinity(irq);
 }
@@ -149,19 +170,35 @@ int irq_select_affinity_usr(unsigned int irq)
         int ret;
 
         spin_lock_irqsave(&desc->lock, flags);
-        ret = do_irq_select_affinity(irq, desc);
+        ret = setup_affinity(irq, desc);
+        if (!ret)
+                irq_set_thread_affinity(desc, desc->affinity);
         spin_unlock_irqrestore(&desc->lock, flags);
 
         return ret;
 }
 
 #else
-static inline int do_irq_select_affinity(int irq, struct irq_desc *desc)
+static inline int setup_affinity(unsigned int irq, struct irq_desc *desc)
 {
         return 0;
 }
 #endif
 
+void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend)
+{
+        if (suspend) {
+                if (!desc->action || (desc->action->flags & IRQF_TIMER))
+                        return;
+                desc->status |= IRQ_SUSPENDED;
+        }
+
+        if (!desc->depth++) {
+                desc->status |= IRQ_DISABLED;
+                desc->chip->disable(irq);
+        }
+}
+
 /**
  *      disable_irq_nosync - disable an irq without waiting
  *      @irq: Interrupt to disable
@@ -182,10 +219,7 @@ void disable_irq_nosync(unsigned int irq)
                 return;
 
         spin_lock_irqsave(&desc->lock, flags);
-        if (!desc->depth++) {
-                desc->status |= IRQ_DISABLED;
-                desc->chip->disable(irq);
-        }
+        __disable_irq(desc, irq, false);
         spin_unlock_irqrestore(&desc->lock, flags);
 }
 EXPORT_SYMBOL(disable_irq_nosync);
@@ -215,15 +249,21 @@ void disable_irq(unsigned int irq)
 }
 EXPORT_SYMBOL(disable_irq);
 
-static void __enable_irq(struct irq_desc *desc, unsigned int irq)
+void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume)
 {
+        if (resume)
+                desc->status &= ~IRQ_SUSPENDED;
+
         switch (desc->depth) {
         case 0:
+ err_out:
                 WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n", irq);
                 break;
         case 1: {
                 unsigned int status = desc->status & ~IRQ_DISABLED;
 
+                if (desc->status & IRQ_SUSPENDED)
+                        goto err_out;
                 /* Prevent probing on this irq: */
                 desc->status = status | IRQ_NOPROBE;
                 check_irq_resend(desc, irq);
@@ -253,7 +293,7 @@ void enable_irq(unsigned int irq)
                 return;
 
         spin_lock_irqsave(&desc->lock, flags);
-        __enable_irq(desc, irq);
+        __enable_irq(desc, irq, false);
         spin_unlock_irqrestore(&desc->lock, flags);
 }
 EXPORT_SYMBOL(enable_irq);
@@ -384,14 +424,98 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
         return ret;
 }
 
+static int irq_wait_for_interrupt(struct irqaction *action)
+{
+        while (!kthread_should_stop()) {
+                set_current_state(TASK_INTERRUPTIBLE);
+
+                if (test_and_clear_bit(IRQTF_RUNTHREAD,
+                                       &action->thread_flags)) {
+                        __set_current_state(TASK_RUNNING);
+                        return 0;
+                }
+                schedule();
+        }
+        return -1;
+}
+
+/*
+ * Interrupt handler thread
+ */
+static int irq_thread(void *data)
+{
+        struct sched_param param = { .sched_priority = MAX_USER_RT_PRIO/2, };
+        struct irqaction *action = data;
+        struct irq_desc *desc = irq_to_desc(action->irq);
+        int wake;
+
+        sched_setscheduler(current, SCHED_FIFO, &param);
+        current->irqaction = action;
+
+        while (!irq_wait_for_interrupt(action)) {
+
+                atomic_inc(&desc->threads_active);
+
+                spin_lock_irq(&desc->lock);
+                if (unlikely(desc->status & IRQ_DISABLED)) {
+                        /*
+                         * CHECKME: We might need a dedicated
+                         * IRQ_THREAD_PENDING flag here, which
+                         * retriggers the thread in check_irq_resend()
+                         * but AFAICT IRQ_PENDING should be fine as it
+                         * retriggers the interrupt itself --- tglx
+                         */
+                        desc->status |= IRQ_PENDING;
+                        spin_unlock_irq(&desc->lock);
+                } else {
+                        spin_unlock_irq(&desc->lock);
+
+                        action->thread_fn(action->irq, action->dev_id);
+                }
+
+                wake = atomic_dec_and_test(&desc->threads_active);
+
+                if (wake && waitqueue_active(&desc->wait_for_threads))
+                        wake_up(&desc->wait_for_threads);
+        }
+
+        /*
+         * Clear irqaction. Otherwise exit_irq_thread() would make
+         * fuzz about an active irq thread going into nirvana.
+         */
+        current->irqaction = NULL;
+        return 0;
+}
+
+/*
+ * Called from do_exit()
+ */
+void exit_irq_thread(void)
+{
+        struct task_struct *tsk = current;
+
+        if (!tsk->irqaction)
+                return;
+
+        printk(KERN_ERR
+               "exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n",
+               tsk->comm ? tsk->comm : "", tsk->pid, tsk->irqaction->irq);
+
+        /*
+         * Set the THREAD DIED flag to prevent further wakeups of the
+         * soon to be gone threaded handler.
+         */
+        set_bit(IRQTF_DIED, &tsk->irqaction->flags);
+}
+
 /*
  * Internal function to register an irqaction - typically used to
  * allocate special interrupts that are part of the architecture.
  */
 static int
-__setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
+__setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
 {
-        struct irqaction *old, **p;
+        struct irqaction *old, **old_ptr;
         const char *old_name = NULL;
         unsigned long flags;
         int shared = 0;
@@ -420,11 +544,31 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
         }
 
         /*
+         * Threaded handler ?
+         */
+        if (new->thread_fn) {
+                struct task_struct *t;
+
+                t = kthread_create(irq_thread, new, "irq/%d-%s", irq,
+                                   new->name);
+                if (IS_ERR(t))
+                        return PTR_ERR(t);
+                /*
+                 * We keep the reference to the task struct even if
+                 * the thread dies to avoid that the interrupt code
+                 * references an already freed task_struct.
+                 */
+                get_task_struct(t);
+                new->thread = t;
+                wake_up_process(t);
+        }
+
+        /*
          * The following block of code has to be executed atomically
          */
         spin_lock_irqsave(&desc->lock, flags);
-        p = &desc->action;
-        old = *p;
+        old_ptr = &desc->action;
+        old = *old_ptr;
         if (old) {
                 /*
                  * Can't share interrupts unless both agree to and are
@@ -447,8 +591,8 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
 
                 /* add new interrupt at end of irq queue */
                 do {
-                        p = &old->next;
-                        old = *p;
+                        old_ptr = &old->next;
+                        old = *old_ptr;
                 } while (old);
                 shared = 1;
         }
@@ -456,15 +600,15 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
         if (!shared) {
                 irq_chip_set_defaults(desc->chip);
 
+                init_waitqueue_head(&desc->wait_for_threads);
+
                 /* Setup the type (level, edge polarity) if configured: */
                 if (new->flags & IRQF_TRIGGER_MASK) {
                         ret = __irq_set_trigger(desc, irq,
                                         new->flags & IRQF_TRIGGER_MASK);
 
-                        if (ret) {
-                                spin_unlock_irqrestore(&desc->lock, flags);
-                                return ret;
-                        }
+                        if (ret)
+                                goto out_thread;
                 } else
                         compat_irq_chip_set_default_handler(desc);
 #if defined(CONFIG_IRQ_PER_CPU)
@@ -488,7 +632,7 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
                         desc->status |= IRQ_NO_BALANCING;
 
                 /* Set default affinity mask once everything is setup */
-                do_irq_select_affinity(irq, desc);
+                setup_affinity(irq, desc);
 
         } else if ((new->flags & IRQF_TRIGGER_MASK)
                         && (new->flags & IRQF_TRIGGER_MASK)
@@ -499,7 +643,7 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
                                 (int)(new->flags & IRQF_TRIGGER_MASK));
         }
 
-        *p = new;
+        *old_ptr = new;
 
         /* Reset broken irq detection when installing new handler */
         desc->irq_count = 0;
@@ -511,7 +655,7 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
          */
         if (shared && (desc->status & IRQ_SPURIOUS_DISABLED)) {
                 desc->status &= ~IRQ_SPURIOUS_DISABLED;
-                __enable_irq(desc, irq);
+                __enable_irq(desc, irq, false);
         }
 
         spin_unlock_irqrestore(&desc->lock, flags);
@@ -532,8 +676,19 @@ mismatch:
                 dump_stack();
         }
 #endif
+        ret = -EBUSY;
+
+out_thread:
         spin_unlock_irqrestore(&desc->lock, flags);
-        return -EBUSY;
+        if (new->thread) {
+                struct task_struct *t = new->thread;
+
+                new->thread = NULL;
+                if (likely(!test_bit(IRQTF_DIED, &new->thread_flags)))
+                        kthread_stop(t);
+                put_task_struct(t);
+        }
+        return ret;
 }
 
 /**
@@ -549,97 +704,138 @@ int setup_irq(unsigned int irq, struct irqaction *act)
 
         return __setup_irq(irq, desc, act);
 }
+EXPORT_SYMBOL_GPL(setup_irq);
 
-/**
- *      free_irq - free an interrupt
- *      @irq: Interrupt line to free
- *      @dev_id: Device identity to free
- *
- *      Remove an interrupt handler. The handler is removed and if the
- *      interrupt line is no longer in use by any driver it is disabled.
- *      On a shared IRQ the caller must ensure the interrupt is disabled
- *      on the card it drives before calling this function. The function
- *      does not return until any executing interrupts for this IRQ
- *      have completed.
- *
- *      This function must not be called from interrupt context.
+ /*
+ * Internal function to unregister an irqaction - used to free
+ * regular and special interrupts that are part of the architecture.
  */
-void free_irq(unsigned int irq, void *dev_id)
+static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
 {
         struct irq_desc *desc = irq_to_desc(irq);
-        struct irqaction **p;
+        struct irqaction *action, **action_ptr;
+        struct task_struct *irqthread;
         unsigned long flags;
 
-        WARN_ON(in_interrupt());
+        WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
 
         if (!desc)
-                return;
+                return NULL;
 
         spin_lock_irqsave(&desc->lock, flags);
-        p = &desc->action;
+
+        /*
+         * There can be multiple actions per IRQ descriptor, find the right
+         * one based on the dev_id:
+         */
+        action_ptr = &desc->action;
         for (;;) {
-                struct irqaction *action = *p;
+                action = *action_ptr;
+
+                if (!action) {
+                        WARN(1, "Trying to free already-free IRQ %d\n", irq);
+                        spin_unlock_irqrestore(&desc->lock, flags);
 
-                if (action) {
-                        struct irqaction **pp = p;
+                        return NULL;
+                }
 
-                        p = &action->next;
-                        if (action->dev_id != dev_id)
-                                continue;
+                if (action->dev_id == dev_id)
+                        break;
+                action_ptr = &action->next;
+        }
 
-                        /* Found it - now remove it from the list of entries */
-                        *pp = action->next;
+        /* Found it - now remove it from the list of entries: */
+        *action_ptr = action->next;
 
-                        /* Currently used only by UML, might disappear one day.*/
+        /* Currently used only by UML, might disappear one day: */
 #ifdef CONFIG_IRQ_RELEASE_METHOD
-                        if (desc->chip->release)
-                                desc->chip->release(irq, dev_id);
+        if (desc->chip->release)
+                desc->chip->release(irq, dev_id);
 #endif
 
-                        if (!desc->action) {
-                                desc->status |= IRQ_DISABLED;
-                                if (desc->chip->shutdown)
-                                        desc->chip->shutdown(irq);
-                                else
-                                        desc->chip->disable(irq);
-                        }
-                        spin_unlock_irqrestore(&desc->lock, flags);
-                        unregister_handler_proc(irq, action);
+        /* If this was the last handler, shut down the IRQ line: */
+        if (!desc->action) {
+                desc->status |= IRQ_DISABLED;
+                if (desc->chip->shutdown)
+                        desc->chip->shutdown(irq);
+                else
+                        desc->chip->disable(irq);
+        }
+
+        irqthread = action->thread;
+        action->thread = NULL;
+
+        spin_unlock_irqrestore(&desc->lock, flags);
+
+        unregister_handler_proc(irq, action);
+
+        /* Make sure it's not being used on another CPU: */
+        synchronize_irq(irq);
+
+        if (irqthread) {
+                if (!test_bit(IRQTF_DIED, &action->thread_flags))
+                        kthread_stop(irqthread);
+                put_task_struct(irqthread);
+        }
 
-                        /* Make sure it's not being used on another CPU */
-                        synchronize_irq(irq);
-#ifdef CONFIG_DEBUG_SHIRQ
-                        /*
-                         * It's a shared IRQ -- the driver ought to be
-                         * prepared for it to happen even now it's
-                         * being freed, so let's make sure....  We do
-                         * this after actually deregistering it, to
-                         * make sure that a 'real' IRQ doesn't run in
-                         * parallel with our fake
-                         */
-                        if (action->flags & IRQF_SHARED) {
-                                local_irq_save(flags);
-                                action->handler(irq, dev_id);
-                                local_irq_restore(flags);
-                        }
-#endif
-                        kfree(action);
-                        return;
-                }
-                printk(KERN_ERR "Trying to free already-free IRQ %d\n", irq);
 #ifdef CONFIG_DEBUG_SHIRQ
-                dump_stack();
-#endif
-                spin_unlock_irqrestore(&desc->lock, flags);
-                return;
+        /*
+         * It's a shared IRQ -- the driver ought to be prepared for an IRQ
+         * event to happen even now it's being freed, so let's make sure that
+         * is so by doing an extra call to the handler ....
+         *
+         * ( We do this after actually deregistering it, to make sure that a
+         *   'real' IRQ doesn't run in * parallel with our fake. )
+         */
+        if (action->flags & IRQF_SHARED) {
+                local_irq_save(flags);
+                action->handler(irq, dev_id);
+                local_irq_restore(flags);
         }
+#endif
+        return action;
+}
+
+/**
+ *      remove_irq - free an interrupt
+ *      @irq: Interrupt line to free
+ *      @act: irqaction for the interrupt
+ *
+ * Used to remove interrupts statically setup by the early boot process.
+ */
+void remove_irq(unsigned int irq, struct irqaction *act)
+{
+        __free_irq(irq, act->dev_id);
+}
+EXPORT_SYMBOL_GPL(remove_irq);
+
+/**
+ *      free_irq - free an interrupt allocated with request_irq
+ *      @irq: Interrupt line to free
+ *      @dev_id: Device identity to free
+ *
+ *      Remove an interrupt handler. The handler is removed and if the
+ *      interrupt line is no longer in use by any driver it is disabled.
+ *      On a shared IRQ the caller must ensure the interrupt is disabled
+ *      on the card it drives before calling this function. The function
+ *      does not return until any executing interrupts for this IRQ
+ *      have completed.
+ *
+ *      This function must not be called from interrupt context.
+ */
+void free_irq(unsigned int irq, void *dev_id)
+{
+        kfree(__free_irq(irq, dev_id));
 }
 EXPORT_SYMBOL(free_irq);
 
 /**
- *      request_irq - allocate an interrupt line
+ *      request_threaded_irq - allocate an interrupt line
  *      @irq: Interrupt line to allocate
- *      @handler: Function to be called when the IRQ occurs
+ *      @handler: Function to be called when the IRQ occurs.
+ *                Primary handler for threaded interrupts
+ *      @thread_fn: Function called from the irq handler thread
+ *                  If NULL, no irq thread is created
  *      @irqflags: Interrupt type flags
  *      @devname: An ascii name for the claiming device
  *      @dev_id: A cookie passed back to the handler function
@@ -651,6 +847,15 @@ EXPORT_SYMBOL(free_irq);
  *      raises, you must take care both to initialise your hardware
  *      and to set up the interrupt handler in the right order.
  *
+ *      If you want to set up a threaded irq handler for your device
+ *      then you need to supply @handler and @thread_fn. @handler ist
+ *      still called in hard interrupt context and has to check
+ *      whether the interrupt originates from the device. If yes it
+ *      needs to disable the interrupt on the device and return
+ *      IRQ_THREAD_WAKE which will wake up the handler thread and run
+ *      @thread_fn. This split handler design is necessary to support
+ *      shared interrupts.
+ *
  *      Dev_id must be globally unique. Normally the address of the
  *      device data structure is used as the cookie. Since the handler
  *      receives this value it makes sense to use it.
@@ -666,8 +871,9 @@ EXPORT_SYMBOL(free_irq);
  *      IRQF_TRIGGER_*          Specify active edge(s) or level
  *
  */
-int request_irq(unsigned int irq, irq_handler_t handler,
-                unsigned long irqflags, const char *devname, void *dev_id)
+int request_threaded_irq(unsigned int irq, irq_handler_t handler,
+                         irq_handler_t thread_fn, unsigned long irqflags,
+                         const char *devname, void *dev_id)
 {
         struct irqaction *action;
         struct irq_desc *desc;
@@ -679,11 +885,12 @@ int request_irq(unsigned int irq, irq_handler_t handler,
          * the behavior is classified as "will not fix" so we need to
          * start nudging drivers away from using that idiom.
          */
-        if ((irqflags & (IRQF_SHARED|IRQF_DISABLED))
-                        == (IRQF_SHARED|IRQF_DISABLED))
-                pr_warning("IRQ %d/%s: IRQF_DISABLED is not "
-                                "guaranteed on shared IRQs\n",
-                                irq, devname);
+        if ((irqflags & (IRQF_SHARED|IRQF_DISABLED)) ==
+                                        (IRQF_SHARED|IRQF_DISABLED)) {
+                pr_warning(
+                  "IRQ %d/%s: IRQF_DISABLED is not guaranteed on shared IRQs\n",
+                        irq, devname);
+        }
 
 #ifdef CONFIG_LOCKDEP
         /*
@@ -709,15 +916,14 @@ int request_irq(unsigned int irq, irq_handler_t handler,
         if (!handler)
                 return -EINVAL;
 
-        action = kmalloc(sizeof(struct irqaction), GFP_ATOMIC);
+        action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
         if (!action)
                 return -ENOMEM;
 
         action->handler = handler;
+        action->thread_fn = thread_fn;
         action->flags = irqflags;
-        cpus_clear(action->mask);
         action->name = devname;
-        action->next = NULL;
         action->dev_id = dev_id;
 
         retval = __setup_irq(irq, desc, action);
@@ -745,4 +951,4 @@ int request_irq(unsigned int irq, irq_handler_t handler,
 #endif
         return retval;
 }
-EXPORT_SYMBOL(request_irq);
+EXPORT_SYMBOL(request_threaded_irq);
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index bd72329e630c..e05ad9be43b7 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -18,7 +18,7 @@ void move_masked_irq(int irq)
 
         desc->status &= ~IRQ_MOVE_PENDING;
 
-        if (unlikely(cpumask_empty(&desc->pending_mask)))
+        if (unlikely(cpumask_empty(desc->pending_mask)))
                 return;
 
         if (!desc->chip->set_affinity)
@@ -38,13 +38,13 @@ void move_masked_irq(int irq)
          * For correct operation this depends on the caller
          * masking the irqs.
          */
-        if (likely(cpumask_any_and(&desc->pending_mask, cpu_online_mask)
+        if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
                    < nr_cpu_ids)) {
-                cpumask_and(&desc->affinity,
-                            &desc->pending_mask, cpu_online_mask);
-                desc->chip->set_affinity(irq, &desc->affinity);
+                cpumask_and(desc->affinity,
+                            desc->pending_mask, cpu_online_mask);
+                desc->chip->set_affinity(irq, desc->affinity);
         }
-        cpumask_clear(&desc->pending_mask);
+        cpumask_clear(desc->pending_mask);
 }
 
 void move_native_irq(int irq)
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
index acd88356ac76..243d6121e50e 100644
--- a/kernel/irq/numa_migrate.c
+++ b/kernel/irq/numa_migrate.c
@@ -17,16 +17,11 @@ static void init_copy_kstat_irqs(struct irq_desc *old_desc,
                                  struct irq_desc *desc,
                                  int cpu, int nr)
 {
-        unsigned long bytes;
-
         init_kstat_irqs(desc, cpu, nr);
 
-        if (desc->kstat_irqs != old_desc->kstat_irqs) {
-                /* Compute how many bytes we need per irq and allocate them */
-                bytes = nr * sizeof(unsigned int);
-
-                memcpy(desc->kstat_irqs, old_desc->kstat_irqs, bytes);
-        }
+        if (desc->kstat_irqs != old_desc->kstat_irqs)
+                memcpy(desc->kstat_irqs, old_desc->kstat_irqs,
+                         nr * sizeof(*desc->kstat_irqs));
 }
 
 static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc)
@@ -38,15 +33,22 @@ static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc)
         old_desc->kstat_irqs = NULL;
 }
 
-static void init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
+static bool init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
                  struct irq_desc *desc, int cpu)
 {
         memcpy(desc, old_desc, sizeof(struct irq_desc));
+        if (!init_alloc_desc_masks(desc, cpu, false)) {
+                printk(KERN_ERR "irq %d: can not get new irq_desc cpumask "
+                                "for migration.\n", irq);
+                return false;
+        }
         spin_lock_init(&desc->lock);
         desc->cpu = cpu;
         lockdep_set_class(&desc->lock, &irq_desc_lock_class);
         init_copy_kstat_irqs(old_desc, desc, cpu, nr_cpu_ids);
+        init_copy_desc_masks(old_desc, desc);
         arch_init_copy_chip_data(old_desc, desc, cpu);
+        return true;
 }
 
 static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc)
@@ -76,12 +78,18 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
         node = cpu_to_node(cpu);
         desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
         if (!desc) {
-                printk(KERN_ERR "irq %d: can not get new irq_desc for migration.\n", irq);
+                printk(KERN_ERR "irq %d: can not get new irq_desc "
+                                "for migration.\n", irq);
+                /* still use old one */
+                desc = old_desc;
+                goto out_unlock;
+        }
+        if (!init_copy_one_irq_desc(irq, old_desc, desc, cpu)) {
                 /* still use old one */
+                kfree(desc);
                 desc = old_desc;
                 goto out_unlock;
         }
-        init_copy_one_irq_desc(irq, old_desc, desc, cpu);
 
         irq_desc_ptrs[irq] = desc;
         spin_unlock_irqrestore(&sparse_irq_lock, flags);
diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
new file mode 100644
index 000000000000..638d8bedec14
--- /dev/null
+++ b/kernel/irq/pm.c
@@ -0,0 +1,79 @@
+/*
+ * linux/kernel/irq/pm.c
+ *
+ * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
+ *
+ * This file contains power management functions related to interrupts.
+ */
+
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+
+#include "internals.h"
+
+/**
+ * suspend_device_irqs - disable all currently enabled interrupt lines
+ *
+ * During system-wide suspend or hibernation device interrupts need to be
+ * disabled at the chip level and this function is provided for this purpose.
+ * It disables all interrupt lines that are enabled at the moment and sets the
+ * IRQ_SUSPENDED flag for them.
+ */
+void suspend_device_irqs(void)
+{
+        struct irq_desc *desc;
+        int irq;
+
+        for_each_irq_desc(irq, desc) {
+                unsigned long flags;
+
+                spin_lock_irqsave(&desc->lock, flags);
+                __disable_irq(desc, irq, true);
+                spin_unlock_irqrestore(&desc->lock, flags);
+        }
+
+        for_each_irq_desc(irq, desc)
+                if (desc->status & IRQ_SUSPENDED)
+                        synchronize_irq(irq);
+}
+EXPORT_SYMBOL_GPL(suspend_device_irqs);
+
+/**
+ * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
+ *
+ * Enable all interrupt lines previously disabled by suspend_device_irqs() that
+ * have the IRQ_SUSPENDED flag set.
+ */
+void resume_device_irqs(void)
+{
+        struct irq_desc *desc;
+        int irq;
+
+        for_each_irq_desc(irq, desc) {
+                unsigned long flags;
+
+                if (!(desc->status & IRQ_SUSPENDED))
+                        continue;
+
+                spin_lock_irqsave(&desc->lock, flags);
+                __enable_irq(desc, irq, true);
+                spin_unlock_irqrestore(&desc->lock, flags);
+        }
+}
+EXPORT_SYMBOL_GPL(resume_device_irqs);
+
+/**
+ * check_wakeup_irqs - check if any wake-up interrupts are pending
+ */
+int check_wakeup_irqs(void)
+{
+        struct irq_desc *desc;
+        int irq;
+
+        for_each_irq_desc(irq, desc)
+                if ((desc->status & IRQ_WAKEUP) && (desc->status & IRQ_PENDING))
+                        return -EBUSY;
+
+        return 0;
+}
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index aae3f742bcec..692363dd591f 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -20,11 +20,11 @@ static struct proc_dir_entry *root_irq_dir;
 static int irq_affinity_proc_show(struct seq_file *m, void *v)
 {
         struct irq_desc *desc = irq_to_desc((long)m->private);
-        const struct cpumask *mask = &desc->affinity;
+        const struct cpumask *mask = desc->affinity;
 
 #ifdef CONFIG_GENERIC_PENDING_IRQ
         if (desc->status & IRQ_MOVE_PENDING)
-                mask = &desc->pending_mask;
+                mask = desc->pending_mask;
 #endif
         seq_cpumask(m, mask);
         seq_putc(m, '\n');
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index dd364c11e56e..4d568294de3e 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -104,7 +104,7 @@ static int misrouted_irq(int irq)
         return ok;
 }
 
-static void poll_spurious_irqs(unsigned long dummy)
+static void poll_all_shared_irqs(void)
 {
         struct irq_desc *desc;
         int i;
@@ -123,11 +123,23 @@ static void poll_spurious_irqs(unsigned long dummy)
 
                 try_one_irq(i, desc);
         }
+}
+
+static void poll_spurious_irqs(unsigned long dummy)
+{
+        poll_all_shared_irqs();
 
         mod_timer(&poll_spurious_irq_timer,
                   jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
 }
 
+#ifdef CONFIG_DEBUG_SHIRQ
+void debug_poll_all_shared_irqs(void)
+{
+        poll_all_shared_irqs();
+}
+#endif
+
 /*
  * If 99,900 of the previous 100,000 interrupts have not been handled
  * then assume that the IRQ is stuck in some manner. Drop a diagnostic
diff --git a/kernel/itimer.c b/kernel/itimer.c
index 6a5fe93dd8bd..58762f7077ec 100644
--- a/kernel/itimer.c
+++ b/kernel/itimer.c
@@ -62,7 +62,7 @@ int do_getitimer(int which, struct itimerval *value)
                         struct task_cputime cputime;
                         cputime_t utime;
 
-                        thread_group_cputime(tsk, &cputime);
+                        thread_group_cputimer(tsk, &cputime);
                         utime = cputime.utime;
                         if (cputime_le(cval, utime)) { /* about to fire */
                                 cval = jiffies_to_cputime(1);
@@ -82,7 +82,7 @@ int do_getitimer(int which, struct itimerval *value)
                         struct task_cputime times;
                         cputime_t ptime;
 
-                        thread_group_cputime(tsk, &times);
+                        thread_group_cputimer(tsk, &times);
                         ptime = cputime_add(times.utime, times.stime);
                         if (cputime_le(cval, ptime)) { /* about to fire */
                                 cval = jiffies_to_cputime(1);
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 7b8b0f21a5b1..374faf9bfdc7 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -161,6 +161,25 @@ unsigned long kallsyms_lookup_name(const char *name)
         return module_kallsyms_lookup_name(name);
 }
 
+int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
+                                      unsigned long),
+                            void *data)
+{
+        char namebuf[KSYM_NAME_LEN];
+        unsigned long i;
+        unsigned int off;
+        int ret;
+
+        for (i = 0, off = 0; i < kallsyms_num_syms; i++) {
+                off = kallsyms_expand_symbol(off, namebuf);
+                ret = fn(data, namebuf, NULL, kallsyms_addresses[i]);
+                if (ret != 0)
+                        return ret;
+        }
+        return module_kallsyms_on_each_symbol(fn, data);
+}
+EXPORT_SYMBOL_GPL(kallsyms_on_each_symbol);
+
 static unsigned long get_symbol_pos(unsigned long addr,
                                     unsigned long *symbolsize,
                                     unsigned long *offset)
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 8a6d7b08864e..5a758c6e4950 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -42,7 +42,7 @@
 note_buf_t* crash_notes;
 
 /* vmcoreinfo stuff */
-unsigned char vmcoreinfo_data[VMCOREINFO_BYTES];
+static unsigned char vmcoreinfo_data[VMCOREINFO_BYTES];
 u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
 size_t vmcoreinfo_size;
 size_t vmcoreinfo_max_size = sizeof(vmcoreinfo_data);
@@ -1130,7 +1130,7 @@ void crash_save_cpu(struct pt_regs *regs, int cpu)
                 return;
         memset(&prstatus, 0, sizeof(prstatus));
         prstatus.pr_pid = current->pid;
-        elf_core_copy_regs(&prstatus.pr_reg, regs);
+        elf_core_copy_kernel_regs(&prstatus.pr_reg, regs);
         buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS,
                               &prstatus, sizeof(prstatus));
         final_note(buf);
@@ -1409,6 +1409,7 @@ static int __init crash_save_vmcoreinfo_init(void)
         VMCOREINFO_OFFSET(list_head, prev);
         VMCOREINFO_OFFSET(vm_struct, addr);
         VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
+        log_buf_kexec_setup();
         VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
         VMCOREINFO_NUMBER(NR_FREE_PAGES);
         VMCOREINFO_NUMBER(PG_lru);
@@ -1450,11 +1451,7 @@ int kernel_kexec(void)
                 error = device_suspend(PMSG_FREEZE);
                 if (error)
                         goto Resume_console;
-                error = disable_nonboot_cpus();
-                if (error)
-                        goto Resume_devices;
                 device_pm_lock();
-                local_irq_disable();
                 /* At this point, device_suspend() has been called,
                  * but *not* device_power_down(). We *must*
                  * device_power_down() now.  Otherwise, drivers for
@@ -1464,6 +1461,14 @@ int kernel_kexec(void)
                  */
                 error = device_power_down(PMSG_FREEZE);
                 if (error)
+                        goto Resume_devices;
+                error = disable_nonboot_cpus();
+                if (error)
+                        goto Enable_cpus;
+                local_irq_disable();
+                /* Suspend system devices */
+                error = sysdev_suspend(PMSG_FREEZE);
+                if (error)
                         goto Enable_irqs;
         } else
 #endif
@@ -1477,12 +1482,14 @@ int kernel_kexec(void)
 
 #ifdef CONFIG_KEXEC_JUMP
         if (kexec_image->preserve_context) {
-                device_power_up(PMSG_RESTORE);
+                sysdev_resume();
  Enable_irqs:
                 local_irq_enable();
-                device_pm_unlock();
+ Enable_cpus:
                 enable_nonboot_cpus();
+                device_power_up(PMSG_RESTORE);
  Resume_devices:
+                device_pm_unlock();
                 device_resume(PMSG_RESTORE);
  Resume_console:
                 resume_console();
diff --git a/kernel/kmod.c b/kernel/kmod.c
index a27a5f64443d..b750675251e5 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -50,7 +50,8 @@ static struct workqueue_struct *khelper_wq;
 char modprobe_path[KMOD_PATH_LEN] = "/sbin/modprobe";
 
 /**
- * request_module - try to load a kernel module
+ * __request_module - try to load a kernel module
+ * @wait: wait (or not) for the operation to complete
  * @fmt: printf style format string for the name of the module
  * @...: arguments as specified in the format string
  *
@@ -63,7 +64,7 @@ char modprobe_path[KMOD_PATH_LEN] = "/sbin/modprobe";
  * If module auto-loading support is disabled then this function
  * becomes a no-operation.
  */
-int request_module(const char *fmt, ...)
+int __request_module(bool wait, const char *fmt, ...)
 {
         va_list args;
         char module_name[MODULE_NAME_LEN];
@@ -108,11 +109,12 @@ int request_module(const char *fmt, ...)
                 return -ENOMEM;
         }
 
-        ret = call_usermodehelper(modprobe_path, argv, envp, 1);
+        ret = call_usermodehelper(modprobe_path, argv, envp,
+                        wait ? UMH_WAIT_PROC : UMH_WAIT_EXEC);
         atomic_dec(&kmod_concurrent);
         return ret;
 }
-EXPORT_SYMBOL(request_module);
+EXPORT_SYMBOL(__request_module);
 #endif /* CONFIG_MODULES */
 
 struct subprocess_info {
@@ -167,7 +169,7 @@ static int ____call_usermodehelper(void *data)
         }
 
         /* We can run anywhere, unlike our parent keventd(). */
-        set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR);
+        set_cpus_allowed_ptr(current, cpu_all_mask);
 
         /*
          * Our parent is keventd, which runs with elevated scheduling priority.
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 7ba8cd9845cb..a5e74ddee0e2 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -43,6 +43,7 @@
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
 #include <linux/kdebug.h>
+#include <linux/memory.h>
 
 #include <asm-generic/sections.h>
 #include <asm/cacheflush.h>
@@ -67,7 +68,7 @@ static struct hlist_head kprobe_table[KPROBE_TABLE_SIZE];
 static struct hlist_head kretprobe_inst_table[KPROBE_TABLE_SIZE];
 
 /* NOTE: change this value only with kprobe_mutex held */
-static bool kprobe_enabled;
+static bool kprobes_all_disarmed;
 
 static DEFINE_MUTEX(kprobe_mutex);      /* Protects kprobe_table */
 static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;
@@ -327,7 +328,7 @@ static int __kprobes aggr_pre_handler(struct kprobe *p, struct pt_regs *regs)
         struct kprobe *kp;
 
         list_for_each_entry_rcu(kp, &p->list, list) {
-                if (kp->pre_handler && !kprobe_gone(kp)) {
+                if (kp->pre_handler && likely(!kprobe_disabled(kp))) {
                         set_kprobe_instance(kp);
                         if (kp->pre_handler(kp, regs))
                                 return 1;
@@ -343,7 +344,7 @@ static void __kprobes aggr_post_handler(struct kprobe *p, struct pt_regs *regs,
         struct kprobe *kp;
 
         list_for_each_entry_rcu(kp, &p->list, list) {
-                if (kp->post_handler && !kprobe_gone(kp)) {
+                if (kp->post_handler && likely(!kprobe_disabled(kp))) {
                         set_kprobe_instance(kp);
                         kp->post_handler(kp, regs, flags);
                         reset_kprobe_instance();
@@ -517,20 +518,28 @@ static inline void copy_kprobe(struct kprobe *old_p, struct kprobe *p)
 }
 
 /*
-* Add the new probe to old_p->list. Fail if this is the
+* Add the new probe to ap->list. Fail if this is the
 * second jprobe at the address - two jprobes can't coexist
 */
-static int __kprobes add_new_kprobe(struct kprobe *old_p, struct kprobe *p)
+static int __kprobes add_new_kprobe(struct kprobe *ap, struct kprobe *p)
 {
+        BUG_ON(kprobe_gone(ap) || kprobe_gone(p));
         if (p->break_handler) {
-                if (old_p->break_handler)
+                if (ap->break_handler)
                         return -EEXIST;
-                list_add_tail_rcu(&p->list, &old_p->list);
-                old_p->break_handler = aggr_break_handler;
+                list_add_tail_rcu(&p->list, &ap->list);
+                ap->break_handler = aggr_break_handler;
         } else
-                list_add_rcu(&p->list, &old_p->list);
-        if (p->post_handler && !old_p->post_handler)
-                old_p->post_handler = aggr_post_handler;
+                list_add_rcu(&p->list, &ap->list);
+        if (p->post_handler && !ap->post_handler)
+                ap->post_handler = aggr_post_handler;
+
+        if (kprobe_disabled(ap) && !kprobe_disabled(p)) {
+                ap->flags &= ~KPROBE_FLAG_DISABLED;
+                if (!kprobes_all_disarmed)
+                        /* Arm the breakpoint again. */
+                        arch_arm_kprobe(ap);
+        }
         return 0;
 }
 
@@ -543,6 +552,7 @@ static inline void add_aggr_kprobe(struct kprobe *ap, struct kprobe *p)
         copy_kprobe(p, ap);
         flush_insn_slot(ap);
         ap->addr = p->addr;
+        ap->flags = p->flags;
         ap->pre_handler = aggr_pre_handler;
         ap->fault_handler = aggr_fault_handler;
         /* We don't care the kprobe which has gone. */
@@ -565,44 +575,59 @@ static int __kprobes register_aggr_kprobe(struct kprobe *old_p,
                                           struct kprobe *p)
 {
         int ret = 0;
-        struct kprobe *ap;
+        struct kprobe *ap = old_p;
 
-        if (kprobe_gone(old_p)) {
+        if (old_p->pre_handler != aggr_pre_handler) {
+                /* If old_p is not an aggr_probe, create new aggr_kprobe. */
+                ap = kzalloc(sizeof(struct kprobe), GFP_KERNEL);
+                if (!ap)
+                        return -ENOMEM;
+                add_aggr_kprobe(ap, old_p);
+        }
+
+        if (kprobe_gone(ap)) {
                 /*
                  * Attempting to insert new probe at the same location that
                  * had a probe in the module vaddr area which already
                  * freed. So, the instruction slot has already been
                  * released. We need a new slot for the new probe.
                  */
-                ret = arch_prepare_kprobe(old_p);
+                ret = arch_prepare_kprobe(ap);
                 if (ret)
+                        /*
+                         * Even if fail to allocate new slot, don't need to
+                         * free aggr_probe. It will be used next time, or
+                         * freed by unregister_kprobe.
+                         */
                         return ret;
-        }
-        if (old_p->pre_handler == aggr_pre_handler) {
-                copy_kprobe(old_p, p);
-                ret = add_new_kprobe(old_p, p);
-                ap = old_p;
-        } else {
-                ap = kzalloc(sizeof(struct kprobe), GFP_KERNEL);
-                if (!ap) {
-                        if (kprobe_gone(old_p))
-                                arch_remove_kprobe(old_p);
-                        return -ENOMEM;
-                }
-                add_aggr_kprobe(ap, old_p);
-                copy_kprobe(ap, p);
-                ret = add_new_kprobe(ap, p);
-        }
-        if (kprobe_gone(old_p)) {
+
                 /*
-                 * If the old_p has gone, its breakpoint has been disarmed.
-                 * We have to arm it again after preparing real kprobes.
+                 * Clear gone flag to prevent allocating new slot again, and
+                 * set disabled flag because it is not armed yet.
                  */
-                ap->flags &= ~KPROBE_FLAG_GONE;
-                if (kprobe_enabled)
-                        arch_arm_kprobe(ap);
+                ap->flags = (ap->flags & ~KPROBE_FLAG_GONE)
+                            | KPROBE_FLAG_DISABLED;
         }
-        return ret;
+
+        copy_kprobe(ap, p);
+        return add_new_kprobe(ap, p);
+}
+
+/* Try to disable aggr_kprobe, and return 1 if succeeded.*/
+static int __kprobes try_to_disable_aggr_kprobe(struct kprobe *p)
+{
+        struct kprobe *kp;
+
+        list_for_each_entry_rcu(kp, &p->list, list) {
+                if (!kprobe_disabled(kp))
+                        /*
+                         * There is an active probe on the list.
+                         * We can't disable aggr_kprobe.
+                         */
+                        return 0;
+        }
+        p->flags |= KPROBE_FLAG_DISABLED;
+        return 1;
 }
 
 static int __kprobes in_kprobes_functions(unsigned long addr)
@@ -663,7 +688,9 @@ int __kprobes register_kprobe(struct kprobe *p)
                 return -EINVAL;
         }
 
-        p->flags = 0;
+        /* User can pass only KPROBE_FLAG_DISABLED to register_kprobe */
+        p->flags &= KPROBE_FLAG_DISABLED;
+
         /*
          * Check if are we probing a module.
          */
@@ -699,17 +726,20 @@ int __kprobes register_kprobe(struct kprobe *p)
                 goto out;
         }
 
+        mutex_lock(&text_mutex);
         ret = arch_prepare_kprobe(p);
         if (ret)
-                goto out;
+                goto out_unlock_text;
 
         INIT_HLIST_NODE(&p->hlist);
         hlist_add_head_rcu(&p->hlist,
                        &kprobe_table[hash_ptr(p->addr, KPROBE_HASH_BITS)]);
 
-        if (kprobe_enabled)
+        if (!kprobes_all_disarmed && !kprobe_disabled(p))
                 arch_arm_kprobe(p);
 
+out_unlock_text:
+        mutex_unlock(&text_mutex);
 out:
         mutex_unlock(&kprobe_mutex);
 
@@ -718,26 +748,39 @@ out:
 
         return ret;
 }
+EXPORT_SYMBOL_GPL(register_kprobe);
 
-/*
- * Unregister a kprobe without a scheduler synchronization.
- */
-static int __kprobes __unregister_kprobe_top(struct kprobe *p)
+/* Check passed kprobe is valid and return kprobe in kprobe_table. */
+static struct kprobe * __kprobes __get_valid_kprobe(struct kprobe *p)
 {
         struct kprobe *old_p, *list_p;
 
         old_p = get_kprobe(p->addr);
         if (unlikely(!old_p))
-                return -EINVAL;
+                return NULL;
 
         if (p != old_p) {
                 list_for_each_entry_rcu(list_p, &old_p->list, list)
                         if (list_p == p)
                         /* kprobe p is a valid probe */
-                                goto valid_p;
-                return -EINVAL;
+                                goto valid;
+                return NULL;
         }
-valid_p:
+valid:
+        return old_p;
+}
+
+/*
+ * Unregister a kprobe without a scheduler synchronization.
+ */
+static int __kprobes __unregister_kprobe_top(struct kprobe *p)
+{
+        struct kprobe *old_p, *list_p;
+
+        old_p = __get_valid_kprobe(p);
+        if (old_p == NULL)
+                return -EINVAL;
+
         if (old_p == p ||
             (old_p->pre_handler == aggr_pre_handler &&
              list_is_singular(&old_p->list))) {
@@ -746,8 +789,11 @@ valid_p:
                  * enabled and not gone - otherwise, the breakpoint would
                  * already have been removed. We save on flushing icache.
                  */
-                if (kprobe_enabled && !kprobe_gone(old_p))
+                if (!kprobes_all_disarmed && !kprobe_disabled(old_p)) {
+                        mutex_lock(&text_mutex);
                         arch_disarm_kprobe(p);
+                        mutex_unlock(&text_mutex);
+                }
                 hlist_del_rcu(&old_p->hlist);
         } else {
                 if (p->break_handler && !kprobe_gone(p))
@@ -761,6 +807,11 @@ valid_p:
                 }
 noclean:
                 list_del_rcu(&p->list);
+                if (!kprobe_disabled(old_p)) {
+                        try_to_disable_aggr_kprobe(old_p);
+                        if (!kprobes_all_disarmed && kprobe_disabled(old_p))
+                                arch_disarm_kprobe(old_p);
+                }
         }
         return 0;
 }
@@ -796,11 +847,13 @@ int __kprobes register_kprobes(struct kprobe **kps, int num)
         }
         return ret;
 }
+EXPORT_SYMBOL_GPL(register_kprobes);
 
 void __kprobes unregister_kprobe(struct kprobe *p)
 {
         unregister_kprobes(&p, 1);
 }
+EXPORT_SYMBOL_GPL(unregister_kprobe);
 
 void __kprobes unregister_kprobes(struct kprobe **kps, int num)
 {
@@ -819,6 +872,7 @@ void __kprobes unregister_kprobes(struct kprobe **kps, int num)
                 if (kps[i]->addr)
                         __unregister_kprobe_bottom(kps[i]);
 }
+EXPORT_SYMBOL_GPL(unregister_kprobes);
 
 static struct notifier_block kprobe_exceptions_nb = {
         .notifier_call = kprobe_exceptions_notify,
@@ -858,16 +912,19 @@ int __kprobes register_jprobes(struct jprobe **jps, int num)
         }
         return ret;
 }
+EXPORT_SYMBOL_GPL(register_jprobes);
 
 int __kprobes register_jprobe(struct jprobe *jp)
 {
         return register_jprobes(&jp, 1);
 }
+EXPORT_SYMBOL_GPL(register_jprobe);
 
 void __kprobes unregister_jprobe(struct jprobe *jp)
 {
         unregister_jprobes(&jp, 1);
 }
+EXPORT_SYMBOL_GPL(unregister_jprobe);
 
 void __kprobes unregister_jprobes(struct jprobe **jps, int num)
 {
@@ -887,6 +944,7 @@ void __kprobes unregister_jprobes(struct jprobe **jps, int num)
                         __unregister_kprobe_bottom(&jps[i]->kp);
         }
 }
+EXPORT_SYMBOL_GPL(unregister_jprobes);
 
 #ifdef CONFIG_KRETPROBES
 /*
@@ -912,10 +970,8 @@ static int __kprobes pre_handler_kretprobe(struct kprobe *p,
                 ri->rp = rp;
                 ri->task = current;
 
-                if (rp->entry_handler && rp->entry_handler(ri, regs)) {
-                        spin_unlock_irqrestore(&rp->lock, flags);
+                if (rp->entry_handler && rp->entry_handler(ri, regs))
                         return 0;
-                }
 
                 arch_prepare_kretprobe(ri, regs);
 
@@ -982,6 +1038,7 @@ int __kprobes register_kretprobe(struct kretprobe *rp)
                 free_rp_inst(rp);
         return ret;
 }
+EXPORT_SYMBOL_GPL(register_kretprobe);
 
 int __kprobes register_kretprobes(struct kretprobe **rps, int num)
 {
@@ -999,11 +1056,13 @@ int __kprobes register_kretprobes(struct kretprobe **rps, int num)
         }
         return ret;
 }
+EXPORT_SYMBOL_GPL(register_kretprobes);
 
 void __kprobes unregister_kretprobe(struct kretprobe *rp)
 {
         unregister_kretprobes(&rp, 1);
 }
+EXPORT_SYMBOL_GPL(unregister_kretprobe);
 
 void __kprobes unregister_kretprobes(struct kretprobe **rps, int num)
 {
@@ -1025,24 +1084,30 @@ void __kprobes unregister_kretprobes(struct kretprobe **rps, int num)
                 }
         }
 }
+EXPORT_SYMBOL_GPL(unregister_kretprobes);
 
 #else /* CONFIG_KRETPROBES */
 int __kprobes register_kretprobe(struct kretprobe *rp)
 {
         return -ENOSYS;
 }
+EXPORT_SYMBOL_GPL(register_kretprobe);
 
 int __kprobes register_kretprobes(struct kretprobe **rps, int num)
 {
         return -ENOSYS;
 }
+EXPORT_SYMBOL_GPL(register_kretprobes);
+
 void __kprobes unregister_kretprobe(struct kretprobe *rp)
 {
 }
+EXPORT_SYMBOL_GPL(unregister_kretprobe);
 
 void __kprobes unregister_kretprobes(struct kretprobe **rps, int num)
 {
 }
+EXPORT_SYMBOL_GPL(unregister_kretprobes);
 
 static int __kprobes pre_handler_kretprobe(struct kprobe *p,
                                            struct pt_regs *regs)
@@ -1056,6 +1121,7 @@ static int __kprobes pre_handler_kretprobe(struct kprobe *p,
 static void __kprobes kill_kprobe(struct kprobe *p)
 {
         struct kprobe *kp;
+
         p->flags |= KPROBE_FLAG_GONE;
         if (p->pre_handler == aggr_pre_handler) {
                 /*
@@ -1168,8 +1234,8 @@ static int __init init_kprobes(void)
                 }
         }
 
-        /* By default, kprobes are enabled */
-        kprobe_enabled = true;
+        /* By default, kprobes are armed */
+        kprobes_all_disarmed = false;
 
         err = arch_init_kprobes();
         if (!err)
@@ -1197,12 +1263,18 @@ static void __kprobes report_probe(struct seq_file *pi, struct kprobe *p,
         else
                 kprobe_type = "k";
         if (sym)
-                seq_printf(pi, "%p  %s  %s+0x%x  %s %s\n", p->addr, kprobe_type,
-                        sym, offset, (modname ? modname : " "),
-                        (kprobe_gone(p) ? "[GONE]" : ""));
+                seq_printf(pi, "%p  %s  %s+0x%x  %s %s%s\n",
+                        p->addr, kprobe_type, sym, offset,
+                        (modname ? modname : " "),
+                        (kprobe_gone(p) ? "[GONE]" : ""),
+                        ((kprobe_disabled(p) && !kprobe_gone(p)) ?
+                         "[DISABLED]" : ""));
         else
-                seq_printf(pi, "%p  %s  %p %s\n", p->addr, kprobe_type, p->addr,
-                        (kprobe_gone(p) ? "[GONE]" : ""));
+                seq_printf(pi, "%p  %s  %p %s%s\n",
+                        p->addr, kprobe_type, p->addr,
+                        (kprobe_gone(p) ? "[GONE]" : ""),
+                        ((kprobe_disabled(p) && !kprobe_gone(p)) ?
+                         "[DISABLED]" : ""));
 }
 
 static void __kprobes *kprobe_seq_start(struct seq_file *f, loff_t *pos)
@@ -1267,7 +1339,72 @@ static struct file_operations debugfs_kprobes_operations = {
         .release        = seq_release,
 };
 
-static void __kprobes enable_all_kprobes(void)
+/* Disable one kprobe */
+int __kprobes disable_kprobe(struct kprobe *kp)
+{
+        int ret = 0;
+        struct kprobe *p;
+
+        mutex_lock(&kprobe_mutex);
+
+        /* Check whether specified probe is valid. */
+        p = __get_valid_kprobe(kp);
+        if (unlikely(p == NULL)) {
+                ret = -EINVAL;
+                goto out;
+        }
+
+        /* If the probe is already disabled (or gone), just return */
+        if (kprobe_disabled(kp))
+                goto out;
+
+        kp->flags |= KPROBE_FLAG_DISABLED;
+        if (p != kp)
+                /* When kp != p, p is always enabled. */
+                try_to_disable_aggr_kprobe(p);
+
+        if (!kprobes_all_disarmed && kprobe_disabled(p))
+                arch_disarm_kprobe(p);
+out:
+        mutex_unlock(&kprobe_mutex);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(disable_kprobe);
+
+/* Enable one kprobe */
+int __kprobes enable_kprobe(struct kprobe *kp)
+{
+        int ret = 0;
+        struct kprobe *p;
+
+        mutex_lock(&kprobe_mutex);
+
+        /* Check whether specified probe is valid. */
+        p = __get_valid_kprobe(kp);
+        if (unlikely(p == NULL)) {
+                ret = -EINVAL;
+                goto out;
+        }
+
+        if (kprobe_gone(kp)) {
+                /* This kprobe has gone, we couldn't enable it. */
+                ret = -EINVAL;
+                goto out;
+        }
+
+        if (!kprobes_all_disarmed && kprobe_disabled(p))
+                arch_arm_kprobe(p);
+
+        p->flags &= ~KPROBE_FLAG_DISABLED;
+        if (p != kp)
+                kp->flags &= ~KPROBE_FLAG_DISABLED;
+out:
+        mutex_unlock(&kprobe_mutex);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(enable_kprobe);
+
+static void __kprobes arm_all_kprobes(void)
 {
         struct hlist_head *head;
         struct hlist_node *node;
@@ -1276,18 +1413,20 @@ static void __kprobes enable_all_kprobes(void)
 
         mutex_lock(&kprobe_mutex);
 
-        /* If kprobes are already enabled, just return */
-        if (kprobe_enabled)
+        /* If kprobes are armed, just return */
+        if (!kprobes_all_disarmed)
                 goto already_enabled;
 
+        mutex_lock(&text_mutex);
         for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
                 head = &kprobe_table[i];
                 hlist_for_each_entry_rcu(p, node, head, hlist)
-                        if (!kprobe_gone(p))
+                        if (!kprobe_disabled(p))
                                 arch_arm_kprobe(p);
         }
+        mutex_unlock(&text_mutex);
 
-        kprobe_enabled = true;
+        kprobes_all_disarmed = false;
         printk(KERN_INFO "Kprobes globally enabled\n");
 
 already_enabled:
@@ -1295,7 +1434,7 @@ already_enabled:
         return;
 }
 
-static void __kprobes disable_all_kprobes(void)
+static void __kprobes disarm_all_kprobes(void)
 {
         struct hlist_head *head;
         struct hlist_node *node;
@@ -1304,20 +1443,22 @@ static void __kprobes disable_all_kprobes(void)
 
         mutex_lock(&kprobe_mutex);
 
-        /* If kprobes are already disabled, just return */
-        if (!kprobe_enabled)
+        /* If kprobes are already disarmed, just return */
+        if (kprobes_all_disarmed)
                 goto already_disabled;
 
-        kprobe_enabled = false;
+        kprobes_all_disarmed = true;
         printk(KERN_INFO "Kprobes globally disabled\n");
+        mutex_lock(&text_mutex);
         for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
                 head = &kprobe_table[i];
                 hlist_for_each_entry_rcu(p, node, head, hlist) {
-                        if (!arch_trampoline_kprobe(p) && !kprobe_gone(p))
+                        if (!arch_trampoline_kprobe(p) && !kprobe_disabled(p))
                                 arch_disarm_kprobe(p);
                 }
         }
 
+        mutex_unlock(&text_mutex);
         mutex_unlock(&kprobe_mutex);
         /* Allow all currently running kprobes to complete */
         synchronize_sched();
@@ -1338,7 +1479,7 @@ static ssize_t read_enabled_file_bool(struct file *file,
 {
         char buf[3];
 
-        if (kprobe_enabled)
+        if (!kprobes_all_disarmed)
                 buf[0] = '1';
         else
                 buf[0] = '0';
@@ -1361,12 +1502,12 @@ static ssize_t write_enabled_file_bool(struct file *file,
         case 'y':
         case 'Y':
         case '1':
-                enable_all_kprobes();
+                arm_all_kprobes();
                 break;
         case 'n':
         case 'N':
         case '0':
-                disable_all_kprobes();
+                disarm_all_kprobes();
                 break;
         }
 
@@ -1409,16 +1550,5 @@ late_initcall(debugfs_kprobe_init);
 
 module_init(init_kprobes);
 
-EXPORT_SYMBOL_GPL(register_kprobe);
-EXPORT_SYMBOL_GPL(unregister_kprobe);
-EXPORT_SYMBOL_GPL(register_kprobes);
-EXPORT_SYMBOL_GPL(unregister_kprobes);
-EXPORT_SYMBOL_GPL(register_jprobe);
-EXPORT_SYMBOL_GPL(unregister_jprobe);
-EXPORT_SYMBOL_GPL(register_jprobes);
-EXPORT_SYMBOL_GPL(unregister_jprobes);
+/* defined in arch/.../kernel/kprobes.c */
 EXPORT_SYMBOL_GPL(jprobe_return);
-EXPORT_SYMBOL_GPL(register_kretprobe);
-EXPORT_SYMBOL_GPL(unregister_kretprobe);
-EXPORT_SYMBOL_GPL(register_kretprobes);
-EXPORT_SYMBOL_GPL(unregister_kretprobes);
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 4fbc456f393d..84bbadd4d021 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -110,7 +110,7 @@ static void create_kthread(struct kthread_create_info *create)
                  */
                 sched_setscheduler(create->result, SCHED_NORMAL, &param);
                 set_user_nice(create->result, KTHREAD_NICE_LEVEL);
-                set_cpus_allowed_ptr(create->result, CPU_MASK_ALL_PTR);
+                set_cpus_allowed_ptr(create->result, cpu_all_mask);
         }
         complete(&create->done);
 }
@@ -240,7 +240,7 @@ int kthreadd(void *unused)
         set_task_comm(tsk, "kthreadd");
         ignore_signals(tsk);
         set_user_nice(tsk, KTHREAD_NICE_LEVEL);
-        set_cpus_allowed_ptr(tsk, CPU_MASK_ALL_PTR);
+        set_cpus_allowed_ptr(tsk, cpu_all_mask);
 
         current->flags |= PF_NOFREEZE | PF_FREEZER_NOSIG;
 
diff --git a/kernel/latencytop.c b/kernel/latencytop.c
index 449db466bdbc..ca07c5c0c914 100644
--- a/kernel/latencytop.c
+++ b/kernel/latencytop.c
@@ -9,6 +9,44 @@
  * as published by the Free Software Foundation; version 2
  * of the License.
  */
+
+/*
+ * CONFIG_LATENCYTOP enables a kernel latency tracking infrastructure that is
+ * used by the "latencytop" userspace tool. The latency that is tracked is not
+ * the 'traditional' interrupt latency (which is primarily caused by something
+ * else consuming CPU), but instead, it is the latency an application encounters
+ * because the kernel sleeps on its behalf for various reasons.
+ *
+ * This code tracks 2 levels of statistics:
+ * 1) System level latency
+ * 2) Per process latency
+ *
+ * The latency is stored in fixed sized data structures in an accumulated form;
+ * if the "same" latency cause is hit twice, this will be tracked as one entry
+ * in the data structure. Both the count, total accumulated latency and maximum
+ * latency are tracked in this data structure. When the fixed size structure is
+ * full, no new causes are tracked until the buffer is flushed by writing to
+ * the /proc file; the userspace tool does this on a regular basis.
+ *
+ * A latency cause is identified by a stringified backtrace at the point that
+ * the scheduler gets invoked. The userland tool will use this string to
+ * identify the cause of the latency in human readable form.
+ *
+ * The information is exported via /proc/latency_stats and /proc/<pid>/latency.
+ * These files look like this:
+ *
+ * Latency Top version : v0.1
+ * 70 59433 4897 i915_irq_wait drm_ioctl vfs_ioctl do_vfs_ioctl sys_ioctl
+ * |    |    |    |
+ * |    |    |    +----> the stringified backtrace
+ * |    |    +---------> The maximum latency for this entry in microseconds
+ * |    +--------------> The accumulated latency for this entry (microseconds)
+ * +-------------------> The number of times this entry is hit
+ *
+ * (note: the average latency is the accumulated latency divided by the number
+ * of times)
+ */
+
 #include <linux/latencytop.h>
 #include <linux/kallsyms.h>
 #include <linux/seq_file.h>
@@ -72,7 +110,7 @@ account_global_scheduler_latency(struct task_struct *tsk, struct latency_record
                                 firstnonnull = i;
                         continue;
                 }
-                for (q = 0 ; q < LT_BACKTRACEDEPTH ; q++) {
+                for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
                         unsigned long record = lat->backtrace[q];
 
                         if (latency_record[i].backtrace[q] != record) {
@@ -101,31 +139,52 @@ account_global_scheduler_latency(struct task_struct *tsk, struct latency_record
         memcpy(&latency_record[i], lat, sizeof(struct latency_record));
 }
 
-static inline void store_stacktrace(struct task_struct *tsk, struct latency_record *lat)
+/*
+ * Iterator to store a backtrace into a latency record entry
+ */
+static inline void store_stacktrace(struct task_struct *tsk,
+                                        struct latency_record *lat)
 {
         struct stack_trace trace;
 
         memset(&trace, 0, sizeof(trace));
         trace.max_entries = LT_BACKTRACEDEPTH;
         trace.entries = &lat->backtrace[0];
-        trace.skip = 0;
         save_stack_trace_tsk(tsk, &trace);
 }
 
+/**
+ * __account_scheduler_latency - record an occured latency
+ * @tsk - the task struct of the task hitting the latency
+ * @usecs - the duration of the latency in microseconds
+ * @inter - 1 if the sleep was interruptible, 0 if uninterruptible
+ *
+ * This function is the main entry point for recording latency entries
+ * as called by the scheduler.
+ *
+ * This function has a few special cases to deal with normal 'non-latency'
+ * sleeps: specifically, interruptible sleep longer than 5 msec is skipped
+ * since this usually is caused by waiting for events via select() and co.
+ *
+ * Negative latencies (caused by time going backwards) are also explicitly
+ * skipped.
+ */
 void __sched
-account_scheduler_latency(struct task_struct *tsk, int usecs, int inter)
+__account_scheduler_latency(struct task_struct *tsk, int usecs, int inter)
 {
         unsigned long flags;
         int i, q;
         struct latency_record lat;
 
-        if (!latencytop_enabled)
-                return;
-
         /* Long interruptible waits are generally user requested... */
         if (inter && usecs > 5000)
                 return;
 
+        /* Negative sleeps are time going backwards */
+        /* Zero-time sleeps are non-interesting */
+        if (usecs <= 0)
+                return;
+
         memset(&lat, 0, sizeof(lat));
         lat.count = 1;
         lat.time = usecs;
@@ -143,12 +202,12 @@ account_scheduler_latency(struct task_struct *tsk, int usecs, int inter)
         if (tsk->latency_record_count >= LT_SAVECOUNT)
                 goto out_unlock;
 
-        for (i = 0; i < LT_SAVECOUNT ; i++) {
+        for (i = 0; i < LT_SAVECOUNT; i++) {
                 struct latency_record *mylat;
                 int same = 1;
 
                 mylat = &tsk->latency_record[i];
-                for (q = 0 ; q < LT_BACKTRACEDEPTH ; q++) {
+                for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
                         unsigned long record = lat.backtrace[q];
 
                         if (mylat->backtrace[q] != record) {
@@ -186,7 +245,7 @@ static int lstats_show(struct seq_file *m, void *v)
         for (i = 0; i < MAXLR; i++) {
                 if (latency_record[i].backtrace[0]) {
                         int q;
-                        seq_printf(m, "%i %li %li ",
+                        seq_printf(m, "%i %lu %lu ",
                                 latency_record[i].count,
                                 latency_record[i].time,
                                 latency_record[i].max);
@@ -223,7 +282,7 @@ static int lstats_open(struct inode *inode, struct file *filp)
         return single_open(filp, lstats_show, NULL);
 }
 
-static struct file_operations lstats_fops = {
+static const struct file_operations lstats_fops = {
         .open           = lstats_open,
         .read           = seq_read,
         .write          = lstats_write,
@@ -236,4 +295,4 @@ static int __init init_lstats_procfs(void)
         proc_create("latency_stats", 0644, NULL, &lstats_fops);
         return 0;
 }
-__initcall(init_lstats_procfs);
+device_initcall(init_lstats_procfs);
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 3673a3f44d9d..b0f011866969 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -42,6 +42,7 @@
 #include <linux/hash.h>
 #include <linux/ftrace.h>
 #include <linux/stringify.h>
+#include <trace/lockdep.h>
 
 #include <asm/sections.h>
 
@@ -433,13 +434,6 @@ atomic_t nr_find_usage_forwards_checks;
 atomic_t nr_find_usage_forwards_recursions;
 atomic_t nr_find_usage_backwards_checks;
 atomic_t nr_find_usage_backwards_recursions;
-# define debug_atomic_inc(ptr)          atomic_inc(ptr)
-# define debug_atomic_dec(ptr)          atomic_dec(ptr)
-# define debug_atomic_read(ptr)         atomic_read(ptr)
-#else
-# define debug_atomic_inc(ptr)          do { } while (0)
-# define debug_atomic_dec(ptr)          do { } while (0)
-# define debug_atomic_read(ptr)         0
 #endif
 
 /*
@@ -799,6 +793,7 @@ register_lock_class(struct lockdep_map *lock, unsigned int subclass, int force)
 
                 printk("BUG: MAX_LOCKDEP_KEYS too low!\n");
                 printk("turning off the locking correctness validator.\n");
+                dump_stack();
                 return NULL;
         }
         class = lock_classes + nr_lock_classes++;
@@ -862,6 +857,7 @@ static struct lock_list *alloc_list_entry(void)
 
                 printk("BUG: MAX_LOCKDEP_ENTRIES too low!\n");
                 printk("turning off the locking correctness validator.\n");
+                dump_stack();
                 return NULL;
         }
         return list_entries + nr_list_entries++;
@@ -1688,6 +1684,7 @@ cache_hit:
 
                 printk("BUG: MAX_LOCKDEP_CHAINS too low!\n");
                 printk("turning off the locking correctness validator.\n");
+                dump_stack();
                 return 0;
         }
         chain = lock_chains + nr_lock_chains++;
@@ -1900,9 +1897,9 @@ print_irq_inversion_bug(struct task_struct *curr, struct lock_class *other,
                 curr->comm, task_pid_nr(curr));
         print_lock(this);
         if (forwards)
-                printk("but this lock took another, %s-irq-unsafe lock in the past:\n", irqclass);
+                printk("but this lock took another, %s-unsafe lock in the past:\n", irqclass);
         else
-                printk("but this lock was taken by another, %s-irq-safe lock in the past:\n", irqclass);
+                printk("but this lock was taken by another, %s-safe lock in the past:\n", irqclass);
         print_lock_name(other);
         printk("\n\nand interrupts could create inverse lock ordering between them.\n\n");
 
@@ -2015,7 +2012,8 @@ typedef int (*check_usage_f)(struct task_struct *, struct held_lock *,
                              enum lock_usage_bit bit, const char *name);
 
 static int
-mark_lock_irq(struct task_struct *curr, struct held_lock *this, int new_bit)
+mark_lock_irq(struct task_struct *curr, struct held_lock *this,
+                enum lock_usage_bit new_bit)
 {
         int excl_bit = exclusive_bit(new_bit);
         int read = new_bit & 1;
@@ -2043,7 +2041,7 @@ mark_lock_irq(struct task_struct *curr, struct held_lock *this, int new_bit)
          * states.
          */
         if ((!read || !dir || STRICT_READ_CHECKS) &&
-                        !usage(curr, this, excl_bit, state_name(new_bit)))
+                        !usage(curr, this, excl_bit, state_name(new_bit & ~1)))
                 return 0;
 
         /*
@@ -2546,6 +2544,7 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
                 debug_locks_off();
                 printk("BUG: MAX_LOCKDEP_SUBCLASSES too low!\n");
                 printk("turning off the locking correctness validator.\n");
+                dump_stack();
                 return 0;
         }
 
@@ -2642,6 +2641,7 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
                 debug_locks_off();
                 printk("BUG: MAX_LOCK_DEPTH too low!\n");
                 printk("turning off the locking correctness validator.\n");
+                dump_stack();
                 return 0;
         }
 
@@ -2929,6 +2929,8 @@ void lock_set_class(struct lockdep_map *lock, const char *name,
 }
 EXPORT_SYMBOL_GPL(lock_set_class);
 
+DEFINE_TRACE(lock_acquire);
+
 /*
  * We are not always called with irqs disabled - do that here,
  * and also avoid lockdep recursion:
@@ -2939,6 +2941,8 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
 {
         unsigned long flags;
 
+        trace_lock_acquire(lock, subclass, trylock, read, check, nest_lock, ip);
+
         if (unlikely(current->lockdep_recursion))
                 return;
 
@@ -2953,11 +2957,15 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
 }
 EXPORT_SYMBOL_GPL(lock_acquire);
 
+DEFINE_TRACE(lock_release);
+
 void lock_release(struct lockdep_map *lock, int nested,
                           unsigned long ip)
 {
         unsigned long flags;
 
+        trace_lock_release(lock, nested, ip);
+
         if (unlikely(current->lockdep_recursion))
                 return;
 
@@ -3106,10 +3114,14 @@ found_it:
         lock->ip = ip;
 }
 
+DEFINE_TRACE(lock_contended);
+
 void lock_contended(struct lockdep_map *lock, unsigned long ip)
 {
         unsigned long flags;
 
+        trace_lock_contended(lock, ip);
+
         if (unlikely(!lock_stat))
                 return;
 
@@ -3125,10 +3137,14 @@ void lock_contended(struct lockdep_map *lock, unsigned long ip)
 }
 EXPORT_SYMBOL_GPL(lock_contended);
 
+DEFINE_TRACE(lock_acquired);
+
 void lock_acquired(struct lockdep_map *lock, unsigned long ip)
 {
         unsigned long flags;
 
+        trace_lock_acquired(lock, ip);
+
         if (unlikely(!lock_stat))
                 return;
 
diff --git a/kernel/module.c b/kernel/module.c
index ba22484a987e..05f014efa32c 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -51,6 +51,7 @@
 #include <linux/tracepoint.h>
 #include <linux/ftrace.h>
 #include <linux/async.h>
+#include <linux/percpu.h>
 
 #if 0
 #define DEBUGP printk
@@ -67,7 +68,8 @@
 
 /* List of modules, protected by module_mutex or preempt_disable
  * (delete uses stop_machine/add uses RCU list operations). */
-static DEFINE_MUTEX(module_mutex);
+DEFINE_MUTEX(module_mutex);
+EXPORT_SYMBOL_GPL(module_mutex);
 static LIST_HEAD(modules);
 
 /* Waiting for a module to finish initializing? */
@@ -75,7 +77,7 @@ static DECLARE_WAIT_QUEUE_HEAD(module_wq);
 
 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
 
-/* Bounds of module allocation, for speeding __module_text_address */
+/* Bounds of module allocation, for speeding __module_address */
 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
 
 int register_module_notifier(struct notifier_block * nb)
@@ -185,17 +187,6 @@ extern const unsigned long __start___kcrctab_unused_gpl[];
 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
 #endif
 
-struct symsearch {
-        const struct kernel_symbol *start, *stop;
-        const unsigned long *crcs;
-        enum {
-                NOT_GPL_ONLY,
-                GPL_ONLY,
-                WILL_BE_GPL_ONLY,
-        } licence;
-        bool unused;
-};
-
 static bool each_symbol_in_section(const struct symsearch *arr,
                                    unsigned int arrsize,
                                    struct module *owner,
@@ -216,10 +207,8 @@ static bool each_symbol_in_section(const struct symsearch *arr,
 }
 
 /* Returns true as soon as fn returns true, otherwise false. */
-static bool each_symbol(bool (*fn)(const struct symsearch *arr,
-                                   struct module *owner,
-                                   unsigned int symnum, void *data),
-                        void *data)
+bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
+                            unsigned int symnum, void *data), void *data)
 {
         struct module *mod;
         const struct symsearch arr[] = {
@@ -272,6 +261,7 @@ static bool each_symbol(bool (*fn)(const struct symsearch *arr,
         }
         return false;
 }
+EXPORT_SYMBOL_GPL(each_symbol);
 
 struct find_symbol_arg {
         /* Input */
@@ -282,7 +272,7 @@ struct find_symbol_arg {
         /* Output */
         struct module *owner;
         const unsigned long *crc;
-        unsigned long value;
+        const struct kernel_symbol *sym;
 };
 
 static bool find_symbol_in_section(const struct symsearch *syms,
@@ -323,17 +313,17 @@ static bool find_symbol_in_section(const struct symsearch *syms,
 
         fsa->owner = owner;
         fsa->crc = symversion(syms->crcs, symnum);
-        fsa->value = syms->start[symnum].value;
+        fsa->sym = &syms->start[symnum];
         return true;
 }
 
-/* Find a symbol, return value, (optional) crc and (optional) module
- * which owns it */
-static unsigned long find_symbol(const char *name,
-                                 struct module **owner,
-                                 const unsigned long **crc,
-                                 bool gplok,
-                                 bool warn)
+/* Find a symbol and return it, along with, (optional) crc and
+ * (optional) module which owns it */
+const struct kernel_symbol *find_symbol(const char *name,
+                                        struct module **owner,
+                                        const unsigned long **crc,
+                                        bool gplok,
+                                        bool warn)
 {
         struct find_symbol_arg fsa;
 
@@ -346,15 +336,16 @@ static unsigned long find_symbol(const char *name,
                         *owner = fsa.owner;
                 if (crc)
                         *crc = fsa.crc;
-                return fsa.value;
+                return fsa.sym;
         }
 
         DEBUGP("Failed to find symbol %s\n", name);
-        return -ENOENT;
+        return NULL;
 }
+EXPORT_SYMBOL_GPL(find_symbol);
 
 /* Search for module by name: must hold module_mutex. */
-static struct module *find_module(const char *name)
+struct module *find_module(const char *name)
 {
         struct module *mod;
 
@@ -364,8 +355,37 @@ static struct module *find_module(const char *name)
         }
         return NULL;
 }
+EXPORT_SYMBOL_GPL(find_module);
 
 #ifdef CONFIG_SMP
+
+#ifdef CONFIG_HAVE_DYNAMIC_PER_CPU_AREA
+
+static void *percpu_modalloc(unsigned long size, unsigned long align,
+                             const char *name)
+{
+        void *ptr;
+
+        if (align > PAGE_SIZE) {
+                printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
+                       name, align, PAGE_SIZE);
+                align = PAGE_SIZE;
+        }
+
+        ptr = __alloc_reserved_percpu(size, align);
+        if (!ptr)
+                printk(KERN_WARNING
+                       "Could not allocate %lu bytes percpu data\n", size);
+        return ptr;
+}
+
+static void percpu_modfree(void *freeme)
+{
+        free_percpu(freeme);
+}
+
+#else /* ... !CONFIG_HAVE_DYNAMIC_PER_CPU_AREA */
+
 /* Number of blocks used and allocated. */
 static unsigned int pcpu_num_used, pcpu_num_allocated;
 /* Size of each block.  -ve means used. */
@@ -480,21 +500,6 @@ static void percpu_modfree(void *freeme)
         }
 }
 
-static unsigned int find_pcpusec(Elf_Ehdr *hdr,
-                                 Elf_Shdr *sechdrs,
-                                 const char *secstrings)
-{
-        return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
-}
-
-static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
-{
-        int cpu;
-
-        for_each_possible_cpu(cpu)
-                memcpy(pcpudest + per_cpu_offset(cpu), from, size);
-}
-
 static int percpu_modinit(void)
 {
         pcpu_num_used = 2;
@@ -513,7 +518,26 @@ static int percpu_modinit(void)
         return 0;
 }
 __initcall(percpu_modinit);
+
+#endif /* CONFIG_HAVE_DYNAMIC_PER_CPU_AREA */
+
+static unsigned int find_pcpusec(Elf_Ehdr *hdr,
+                                 Elf_Shdr *sechdrs,
+                                 const char *secstrings)
+{
+        return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
+}
+
+static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
+{
+        int cpu;
+
+        for_each_possible_cpu(cpu)
+                memcpy(pcpudest + per_cpu_offset(cpu), from, size);
+}
+
 #else /* ... !CONFIG_SMP */
+
 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
                                     const char *name)
 {
@@ -535,6 +559,7 @@ static inline void percpu_modcopy(void *pcpudst, const void *src,
         /* pcpusec should be 0, and size of that section should be 0. */
         BUG_ON(size != 0);
 }
+
 #endif /* CONFIG_SMP */
 
 #define MODINFO_ATTR(field)     \
@@ -607,7 +632,7 @@ static int already_uses(struct module *a, struct module *b)
 }
 
 /* Module a uses b */
-static int use_module(struct module *a, struct module *b)
+int use_module(struct module *a, struct module *b)
 {
         struct module_use *use;
         int no_warn, err;
@@ -640,6 +665,7 @@ static int use_module(struct module *a, struct module *b)
         no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
         return 1;
 }
+EXPORT_SYMBOL_GPL(use_module);
 
 /* Clear the unload stuff of the module. */
 static void module_unload_free(struct module *mod)
@@ -822,7 +848,7 @@ SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
         mutex_lock(&module_mutex);
         /* Store the name of the last unloaded module for diagnostic purposes */
         strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
-        unregister_dynamic_debug_module(mod->name);
+        ddebug_remove_module(mod->name);
         free_module(mod);
 
  out:
@@ -860,7 +886,7 @@ void __symbol_put(const char *symbol)
         struct module *owner;
 
         preempt_disable();
-        if (IS_ERR_VALUE(find_symbol(symbol, &owner, NULL, true, false)))
+        if (!find_symbol(symbol, &owner, NULL, true, false))
                 BUG();
         module_put(owner);
         preempt_enable();
@@ -874,8 +900,10 @@ void symbol_put_addr(void *addr)
         if (core_kernel_text((unsigned long)addr))
                 return;
 
-        if (!(modaddr = module_text_address((unsigned long)addr)))
-                BUG();
+        /* module_text_address is safe here: we're supposed to have reference
+         * to module from symbol_get, so it can't go away. */
+        modaddr = __module_text_address((unsigned long)addr);
+        BUG_ON(!modaddr);
         module_put(modaddr);
 }
 EXPORT_SYMBOL_GPL(symbol_put_addr);
@@ -915,10 +943,11 @@ static inline void module_unload_free(struct module *mod)
 {
 }
 
-static inline int use_module(struct module *a, struct module *b)
+int use_module(struct module *a, struct module *b)
 {
         return strong_try_module_get(b) == 0;
 }
+EXPORT_SYMBOL_GPL(use_module);
 
 static inline void module_unload_init(struct module *mod)
 {
@@ -961,12 +990,12 @@ static struct module_attribute *modinfo_attrs[] = {
 
 static const char vermagic[] = VERMAGIC_STRING;
 
-static int try_to_force_load(struct module *mod, const char *symname)
+static int try_to_force_load(struct module *mod, const char *reason)
 {
 #ifdef CONFIG_MODULE_FORCE_LOAD
         if (!test_taint(TAINT_FORCED_MODULE))
-                printk("%s: no version for \"%s\" found: kernel tainted.\n",
-                       mod->name, symname);
+                printk(KERN_WARNING "%s: %s: kernel tainted.\n",
+                       mod->name, reason);
         add_taint_module(mod, TAINT_FORCED_MODULE);
         return 0;
 #else
@@ -1023,9 +1052,9 @@ static inline int check_modstruct_version(Elf_Shdr *sechdrs,
 {
         const unsigned long *crc;
 
-        if (IS_ERR_VALUE(find_symbol("struct_module", NULL, &crc, true, false)))
+        if (!find_symbol("module_layout", NULL, &crc, true, false))
                 BUG();
-        return check_version(sechdrs, versindex, "struct_module", mod, crc);
+        return check_version(sechdrs, versindex, "module_layout", mod, crc);
 }
 
 /* First part is kernel version, which we ignore if module has crcs. */
@@ -1064,25 +1093,25 @@ static inline int same_magic(const char *amagic, const char *bmagic,
 
 /* Resolve a symbol for this module.  I.e. if we find one, record usage.
    Must be holding module_mutex. */
-static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
-                                    unsigned int versindex,
-                                    const char *name,
-                                    struct module *mod)
+static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
+                                                  unsigned int versindex,
+                                                  const char *name,
+                                                  struct module *mod)
 {
         struct module *owner;
-        unsigned long ret;
+        const struct kernel_symbol *sym;
         const unsigned long *crc;
 
-        ret = find_symbol(name, &owner, &crc,
+        sym = find_symbol(name, &owner, &crc,
                           !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
-        if (!IS_ERR_VALUE(ret)) {
-                /* use_module can fail due to OOM,
-                   or module initialization or unloading */
+        /* use_module can fail due to OOM,
+           or module initialization or unloading */
+        if (sym) {
                 if (!check_version(sechdrs, versindex, name, mod, crc) ||
                     !use_module(mod, owner))
-                        ret = -EINVAL;
+                        sym = NULL;
         }
-        return ret;
+        return sym;
 }
 
 /*
@@ -1457,6 +1486,9 @@ static void free_module(struct module *mod)
         /* Module unload stuff */
         module_unload_free(mod);
 
+        /* Free any allocated parameters. */
+        destroy_params(mod->kp, mod->num_kp);
+
         /* release any pointers to mcount in this module */
         ftrace_release(mod->module_core, mod->core_size);
 
@@ -1479,17 +1511,15 @@ static void free_module(struct module *mod)
 void *__symbol_get(const char *symbol)
 {
         struct module *owner;
-        unsigned long value;
+        const struct kernel_symbol *sym;
 
         preempt_disable();
-        value = find_symbol(symbol, &owner, NULL, true, true);
-        if (IS_ERR_VALUE(value))
-                value = 0;
-        else if (strong_try_module_get(owner))
-                value = 0;
+        sym = find_symbol(symbol, &owner, NULL, true, true);
+        if (sym && strong_try_module_get(owner))
+                sym = NULL;
         preempt_enable();
 
-        return (void *)value;
+        return sym ? (void *)sym->value : NULL;
 }
 EXPORT_SYMBOL_GPL(__symbol_get);
 
@@ -1517,8 +1547,7 @@ static int verify_export_symbols(struct module *mod)
 
         for (i = 0; i < ARRAY_SIZE(arr); i++) {
                 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
-                        if (!IS_ERR_VALUE(find_symbol(s->name, &owner,
-                                                      NULL, true, false))) {
+                        if (find_symbol(s->name, &owner, NULL, true, false)) {
                                 printk(KERN_ERR
                                        "%s: exports duplicate symbol %s"
                                        " (owned by %s)\n",
@@ -1542,6 +1571,7 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
         unsigned long secbase;
         unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
         int ret = 0;
+        const struct kernel_symbol *ksym;
 
         for (i = 1; i < n; i++) {
                 switch (sym[i].st_shndx) {
@@ -1561,13 +1591,14 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
                         break;
 
                 case SHN_UNDEF:
-                        sym[i].st_value
-                          = resolve_symbol(sechdrs, versindex,
-                                           strtab + sym[i].st_name, mod);
-
+                        ksym = resolve_symbol(sechdrs, versindex,
+                                              strtab + sym[i].st_name, mod);
                         /* Ok if resolved.  */
-                        if (!IS_ERR_VALUE(sym[i].st_value))
+                        if (ksym) {
+                                sym[i].st_value = ksym->value;
                                 break;
+                        }
+
                         /* Ok if weak.  */
                         if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
                                 break;
@@ -1642,8 +1673,7 @@ static void layout_sections(struct module *mod,
                         if ((s->sh_flags & masks[m][0]) != masks[m][0]
                             || (s->sh_flags & masks[m][1])
                             || s->sh_entsize != ~0UL
-                            || strncmp(secstrings + s->sh_name,
-                                       ".init", 5) == 0)
+                            || strstarts(secstrings + s->sh_name, ".init"))
                                 continue;
                         s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
                         DEBUGP("\t%s\n", secstrings + s->sh_name);
@@ -1660,8 +1690,7 @@ static void layout_sections(struct module *mod,
                         if ((s->sh_flags & masks[m][0]) != masks[m][0]
                             || (s->sh_flags & masks[m][1])
                             || s->sh_entsize != ~0UL
-                            || strncmp(secstrings + s->sh_name,
-                                       ".init", 5) != 0)
+                            || !strstarts(secstrings + s->sh_name, ".init"))
                                 continue;
                         s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
                                          | INIT_OFFSET_MASK);
@@ -1794,8 +1823,7 @@ static char elf_type(const Elf_Sym *sym,
                 else
                         return 'b';
         }
-        if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
-                    ".debug", strlen(".debug")) == 0)
+        if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
                 return 'n';
         return '?';
 }
@@ -1827,19 +1855,13 @@ static inline void add_kallsyms(struct module *mod,
 }
 #endif /* CONFIG_KALLSYMS */
 
-static void dynamic_printk_setup(struct mod_debug *debug, unsigned int num)
+static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
 {
-#ifdef CONFIG_DYNAMIC_PRINTK_DEBUG
-        unsigned int i;
-
-        for (i = 0; i < num; i++) {
-                register_dynamic_debug_module(debug[i].modname,
-                                              debug[i].type,
-                                              debug[i].logical_modname,
-                                              debug[i].flag_names,
-                                              debug[i].hash, debug[i].hash2);
-        }
-#endif /* CONFIG_DYNAMIC_PRINTK_DEBUG */
+#ifdef CONFIG_DYNAMIC_DEBUG
+        if (ddebug_add_module(debug, num, debug->modname))
+                printk(KERN_ERR "dynamic debug error adding module: %s\n",
+                                        debug->modname);
+#endif
 }
 
 static void *module_alloc_update_bounds(unsigned long size)
@@ -1870,8 +1892,7 @@ static noinline struct module *load_module(void __user *umod,
         unsigned int symindex = 0;
         unsigned int strindex = 0;
         unsigned int modindex, versindex, infoindex, pcpuindex;
-        unsigned int num_kp, num_mcount;
-        struct kernel_param *kp;
+        unsigned int num_mcount;
         struct module *mod;
         long err = 0;
         void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
@@ -1888,12 +1909,6 @@ static noinline struct module *load_module(void __user *umod,
         if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
                 return ERR_PTR(-ENOMEM);
 
-        /* Create stop_machine threads since the error path relies on
-         * a non-failing stop_machine call. */
-        err = stop_machine_create();
-        if (err)
-                goto free_hdr;
-
         if (copy_from_user(hdr, umod, len) != 0) {
                 err = -EFAULT;
                 goto free_hdr;
@@ -1934,7 +1949,7 @@ static noinline struct module *load_module(void __user *umod,
                 }
 #ifndef CONFIG_MODULE_UNLOAD
                 /* Don't load .exit sections */
-                if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
+                if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
                         sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
 #endif
         }
@@ -1978,7 +1993,7 @@ static noinline struct module *load_module(void __user *umod,
         modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
         /* This is allowed: modprobe --force will invalidate it. */
         if (!modmagic) {
-                err = try_to_force_load(mod, "magic");
+                err = try_to_force_load(mod, "bad vermagic");
                 if (err)
                         goto free_hdr;
         } else if (!same_magic(modmagic, vermagic, versindex)) {
@@ -2015,14 +2030,6 @@ static noinline struct module *load_module(void __user *umod,
         if (err < 0)
                 goto free_mod;
 
-#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
-        mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t),
-                                      mod->name);
-        if (!mod->refptr) {
-                err = -ENOMEM;
-                goto free_mod;
-        }
-#endif
         if (pcpuindex) {
                 /* We have a special allocation for this section. */
                 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
@@ -2030,7 +2037,7 @@ static noinline struct module *load_module(void __user *umod,
                                          mod->name);
                 if (!percpu) {
                         err = -ENOMEM;
-                        goto free_percpu;
+                        goto free_mod;
                 }
                 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
                 mod->percpu = percpu;
@@ -2082,6 +2089,14 @@ static noinline struct module *load_module(void __user *umod,
         /* Module has been moved. */
         mod = (void *)sechdrs[modindex].sh_addr;
 
+#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
+        mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t),
+                                      mod->name);
+        if (!mod->refptr) {
+                err = -ENOMEM;
+                goto free_init;
+        }
+#endif
         /* Now we've moved module, initialize linked lists, etc. */
         module_unload_init(mod);
 
@@ -2116,8 +2131,8 @@ static noinline struct module *load_module(void __user *umod,
 
         /* Now we've got everything in the final locations, we can
          * find optional sections. */
-        kp = section_objs(hdr, sechdrs, secstrings, "__param", sizeof(*kp),
-                          &num_kp);
+        mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
+                               sizeof(*mod->kp), &mod->num_kp);
         mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
                                  sizeof(*mod->syms), &mod->num_syms);
         mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
@@ -2167,8 +2182,8 @@ static noinline struct module *load_module(void __user *umod,
             || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
 #endif
                 ) {
-                printk(KERN_WARNING "%s: No versions for exported symbols.\n", mod->name);
-                err = try_to_force_load(mod, "nocrc");
+                err = try_to_force_load(mod,
+                                        "no versions for exported symbols");
                 if (err)
                         goto cleanup;
         }
@@ -2213,12 +2228,13 @@ static noinline struct module *load_module(void __user *umod,
         add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
 
         if (!mod->taints) {
-                struct mod_debug *debug;
+                struct _ddebug *debug;
                 unsigned int num_debug;
 
                 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
                                      sizeof(*debug), &num_debug);
-                dynamic_printk_setup(debug, num_debug);
+                if (debug)
+                        dynamic_debug_setup(debug, num_debug);
         }
 
         /* sechdrs[0].sh_size is always zero */
@@ -2262,11 +2278,11 @@ static noinline struct module *load_module(void __user *umod,
          */
         list_add_rcu(&mod->list, &modules);
 
-        err = parse_args(mod->name, mod->args, kp, num_kp, NULL);
+        err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
         if (err < 0)
                 goto unlink;
 
-        err = mod_sysfs_setup(mod, kp, num_kp);
+        err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
         if (err < 0)
                 goto unlink;
         add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
@@ -2275,12 +2291,13 @@ static noinline struct module *load_module(void __user *umod,
         /* Get rid of temporary copy */
         vfree(hdr);
 
-        stop_machine_destroy();
         /* Done! */
         return mod;
 
  unlink:
-        stop_machine(__unlink_module, mod, NULL);
+        /* Unlink carefully: kallsyms could be walking list. */
+        list_del_rcu(&mod->list);
+        synchronize_sched();
         module_arch_cleanup(mod);
  cleanup:
         kobject_del(&mod->mkobj.kobj);
@@ -2288,20 +2305,21 @@ static noinline struct module *load_module(void __user *umod,
         ftrace_release(mod->module_core, mod->core_size);
  free_unload:
         module_unload_free(mod);
+#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
+ free_init:
+        percpu_modfree(mod->refptr);
+#endif
         module_free(mod, mod->module_init);
  free_core:
         module_free(mod, mod->module_core);
+        /* mod will be freed with core. Don't access it beyond this line! */
  free_percpu:
         if (percpu)
                 percpu_modfree(percpu);
-#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
-        percpu_modfree(mod->refptr);
-#endif
  free_mod:
         kfree(args);
  free_hdr:
         vfree(hdr);
-        stop_machine_destroy();
         return ERR_PTR(err);
 
  truncated:
@@ -2578,6 +2596,25 @@ unsigned long module_kallsyms_lookup_name(const char *name)
         preempt_enable();
         return ret;
 }
+
+int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
+                                             struct module *, unsigned long),
+                                   void *data)
+{
+        struct module *mod;
+        unsigned int i;
+        int ret;
+
+        list_for_each_entry(mod, &modules, list) {
+                for (i = 0; i < mod->num_symtab; i++) {
+                        ret = fn(data, mod->strtab + mod->symtab[i].st_name,
+                                 mod, mod->symtab[i].st_value);
+                        if (ret != 0)
+                                return ret;
+                }
+        }
+        return 0;
+}
 #endif /* CONFIG_KALLSYMS */
 
 static char *module_flags(struct module *mod, char *buf)
@@ -2713,29 +2750,31 @@ const struct exception_table_entry *search_module_extables(unsigned long addr)
 }
 
 /*
- * Is this a valid module address?
+ * is_module_address - is this address inside a module?
+ * @addr: the address to check.
+ *
+ * See is_module_text_address() if you simply want to see if the address
+ * is code (not data).
  */
-int is_module_address(unsigned long addr)
+bool is_module_address(unsigned long addr)
 {
-        struct module *mod;
+        bool ret;
 
         preempt_disable();
-
-        list_for_each_entry_rcu(mod, &modules, list) {
-                if (within_module_core(addr, mod)) {
-                        preempt_enable();
-                        return 1;
-                }
-        }
-
+        ret = __module_address(addr) != NULL;
         preempt_enable();
 
-        return 0;
+        return ret;
 }
 
-
-/* Is this a valid kernel address? */
-__notrace_funcgraph struct module *__module_text_address(unsigned long addr)
+/*
+ * __module_address - get the module which contains an address.
+ * @addr: the address.
+ *
+ * Must be called with preempt disabled or module mutex held so that
+ * module doesn't get freed during this.
+ */
+struct module *__module_address(unsigned long addr)
 {
         struct module *mod;
 
@@ -2743,22 +2782,51 @@ __notrace_funcgraph struct module *__module_text_address(unsigned long addr)
                 return NULL;
 
         list_for_each_entry_rcu(mod, &modules, list)
-                if (within(addr, mod->module_init, mod->init_text_size)
-                    || within(addr, mod->module_core, mod->core_text_size))
+                if (within_module_core(addr, mod)
+                    || within_module_init(addr, mod))
                         return mod;
         return NULL;
 }
+EXPORT_SYMBOL_GPL(__module_address);
 
-struct module *module_text_address(unsigned long addr)
+/*
+ * is_module_text_address - is this address inside module code?
+ * @addr: the address to check.
+ *
+ * See is_module_address() if you simply want to see if the address is
+ * anywhere in a module.  See kernel_text_address() for testing if an
+ * address corresponds to kernel or module code.
+ */
+bool is_module_text_address(unsigned long addr)
 {
-        struct module *mod;
+        bool ret;
 
         preempt_disable();
-        mod = __module_text_address(addr);
+        ret = __module_text_address(addr) != NULL;
         preempt_enable();
 
+        return ret;
+}
+
+/*
+ * __module_text_address - get the module whose code contains an address.
+ * @addr: the address.
+ *
+ * Must be called with preempt disabled or module mutex held so that
+ * module doesn't get freed during this.
+ */
+struct module *__module_text_address(unsigned long addr)
+{
+        struct module *mod = __module_address(addr);
+        if (mod) {
+                /* Make sure it's within the text section. */
+                if (!within(addr, mod->module_init, mod->init_text_size)
+                    && !within(addr, mod->module_core, mod->core_text_size))
+                        mod = NULL;
+        }
         return mod;
 }
+EXPORT_SYMBOL_GPL(__module_text_address);
 
 /* Don't grab lock, we're oopsing. */
 void print_modules(void)
@@ -2778,9 +2846,17 @@ void print_modules(void)
 }
 
 #ifdef CONFIG_MODVERSIONS
-/* Generate the signature for struct module here, too, for modversions. */
-void struct_module(struct module *mod) { return; }
-EXPORT_SYMBOL(struct_module);
+/* Generate the signature for all relevant module structures here.
+ * If these change, we don't want to try to parse the module. */
+void module_layout(struct module *mod,
+                   struct modversion_info *ver,
+                   struct kernel_param *kp,
+                   struct kernel_symbol *ks,
+                   struct marker *marker,
+                   struct tracepoint *tp)
+{
+}
+EXPORT_SYMBOL(module_layout);
 #endif
 
 #ifdef CONFIG_MARKERS
diff --git a/kernel/ns_cgroup.c b/kernel/ns_cgroup.c
index 78bc3fdac0d2..5aa854f9e5ae 100644
--- a/kernel/ns_cgroup.c
+++ b/kernel/ns_cgroup.c
@@ -34,7 +34,7 @@ int ns_cgroup_clone(struct task_struct *task, struct pid *pid)
 
 /*
  * Rules:
- *   1. you can only enter a cgroup which is a child of your current
+ *   1. you can only enter a cgroup which is a descendant of your current
  *     cgroup
  *   2. you can only place another process into a cgroup if
  *     a. you have CAP_SYS_ADMIN
@@ -45,21 +45,15 @@ int ns_cgroup_clone(struct task_struct *task, struct pid *pid)
 static int ns_can_attach(struct cgroup_subsys *ss,
                 struct cgroup *new_cgroup, struct task_struct *task)
 {
-        struct cgroup *orig;
-
         if (current != task) {
                 if (!capable(CAP_SYS_ADMIN))
                         return -EPERM;
 
-                if (!cgroup_is_descendant(new_cgroup))
+                if (!cgroup_is_descendant(new_cgroup, current))
                         return -EPERM;
         }
 
-        if (atomic_read(&new_cgroup->count) != 0)
-                return -EPERM;
-
-        orig = task_cgroup(task, ns_subsys_id);
-        if (orig && orig != new_cgroup->parent)
+        if (!cgroup_is_descendant(new_cgroup, task))
                 return -EPERM;
 
         return 0;
@@ -77,7 +71,7 @@ static struct cgroup_subsys_state *ns_create(struct cgroup_subsys *ss,
 
         if (!capable(CAP_SYS_ADMIN))
                 return ERR_PTR(-EPERM);
-        if (!cgroup_is_descendant(cgroup))
+        if (!cgroup_is_descendant(cgroup, current))
                 return ERR_PTR(-EPERM);
 
         ns_cgroup = kzalloc(sizeof(*ns_cgroup), GFP_KERNEL);
diff --git a/kernel/panic.c b/kernel/panic.c
index 2a2ff36ff44d..3fd8c5bf8b39 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -8,19 +8,19 @@
  * This function is used through-out the kernel (including mm and fs)
  * to indicate a major problem.
  */
+#include <linux/debug_locks.h>
+#include <linux/interrupt.h>
+#include <linux/kallsyms.h>
+#include <linux/notifier.h>
 #include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/delay.h>
+#include <linux/random.h>
 #include <linux/reboot.h>
-#include <linux/notifier.h>
-#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/kexec.h>
+#include <linux/sched.h>
 #include <linux/sysrq.h>
-#include <linux/interrupt.h>
+#include <linux/init.h>
 #include <linux/nmi.h>
-#include <linux/kexec.h>
-#include <linux/debug_locks.h>
-#include <linux/random.h>
-#include <linux/kallsyms.h>
 #include <linux/dmi.h>
 
 int panic_on_oops;
@@ -52,19 +52,15 @@ EXPORT_SYMBOL(panic_blink);
  *
  *      This function never returns.
  */
-
 NORET_TYPE void panic(const char * fmt, ...)
 {
-        long i;
         static char buf[1024];
         va_list args;
-#if defined(CONFIG_S390)
-        unsigned long caller = (unsigned long) __builtin_return_address(0);
-#endif
+        long i;
 
         /*
-         * It's possible to come here directly from a panic-assertion and not
-         * have preempt disabled. Some functions called from here want
+         * It's possible to come here directly from a panic-assertion and
+         * not have preempt disabled. Some functions called from here want
          * preempt to be disabled. No point enabling it later though...
          */
         preempt_disable();
@@ -74,7 +70,9 @@ NORET_TYPE void panic(const char * fmt, ...)
         vsnprintf(buf, sizeof(buf), fmt, args);
         va_end(args);
         printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
-        bust_spinlocks(0);
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+        dump_stack();
+#endif
 
         /*
          * If we have crashed and we have a crash kernel loaded let it handle
@@ -83,14 +81,12 @@ NORET_TYPE void panic(const char * fmt, ...)
          */
         crash_kexec(NULL);
 
-#ifdef CONFIG_SMP
         /*
          * Note smp_send_stop is the usual smp shutdown function, which
          * unfortunately means it may not be hardened to work in a panic
          * situation.
          */
         smp_send_stop();
-#endif
 
         atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
 
@@ -99,19 +95,21 @@ NORET_TYPE void panic(const char * fmt, ...)
 
         if (panic_timeout > 0) {
                 /*
-                 * Delay timeout seconds before rebooting the machine. 
-                 * We can't use the "normal" timers since we just panicked..
-                 */
-                printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
+                 * Delay timeout seconds before rebooting the machine.
+                 * We can't use the "normal" timers since we just panicked.
+                 */
+                printk(KERN_EMERG "Rebooting in %d seconds..", panic_timeout);
+
                 for (i = 0; i < panic_timeout*1000; ) {
                         touch_nmi_watchdog();
                         i += panic_blink(i);
                         mdelay(1);
                         i++;
                 }
-                /*      This will not be a clean reboot, with everything
-                 *      shutting down.  But if there is a chance of
-                 *      rebooting the system it will be rebooted.
+                /*
+                 * This will not be a clean reboot, with everything
+                 * shutting down.  But if there is a chance of
+                 * rebooting the system it will be rebooted.
                  */
                 emergency_restart();
         }
@@ -124,38 +122,44 @@ NORET_TYPE void panic(const char * fmt, ...)
         }
 #endif
 #if defined(CONFIG_S390)
-        disabled_wait(caller);
+        {
+                unsigned long caller;
+
+                caller = (unsigned long)__builtin_return_address(0);
+                disabled_wait(caller);
+        }
 #endif
         local_irq_enable();
-        for (i = 0;;) {
+        for (i = 0; ; ) {
                 touch_softlockup_watchdog();
                 i += panic_blink(i);
                 mdelay(1);
                 i++;
         }
+        bust_spinlocks(0);
 }
 
 EXPORT_SYMBOL(panic);
 
 
 struct tnt {
-        u8 bit;
-        char true;
-        char false;
+        u8      bit;
+        char    true;
+        char    false;
 };
 
 static const struct tnt tnts[] = {
-        { TAINT_PROPRIETARY_MODULE, 'P', 'G' },
-        { TAINT_FORCED_MODULE, 'F', ' ' },
-        { TAINT_UNSAFE_SMP, 'S', ' ' },
-        { TAINT_FORCED_RMMOD, 'R', ' ' },
-        { TAINT_MACHINE_CHECK, 'M', ' ' },
-        { TAINT_BAD_PAGE, 'B', ' ' },
-        { TAINT_USER, 'U', ' ' },
-        { TAINT_DIE, 'D', ' ' },
-        { TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
-        { TAINT_WARN, 'W', ' ' },
-        { TAINT_CRAP, 'C', ' ' },
+        { TAINT_PROPRIETARY_MODULE,     'P', 'G' },
+        { TAINT_FORCED_MODULE,          'F', ' ' },
+        { TAINT_UNSAFE_SMP,             'S', ' ' },
+        { TAINT_FORCED_RMMOD,           'R', ' ' },
+        { TAINT_MACHINE_CHECK,          'M', ' ' },
+        { TAINT_BAD_PAGE,               'B', ' ' },
+        { TAINT_USER,                   'U', ' ' },
+        { TAINT_DIE,                    'D', ' ' },
+        { TAINT_OVERRIDDEN_ACPI_TABLE,  'A', ' ' },
+        { TAINT_WARN,                   'W', ' ' },
+        { TAINT_CRAP,                   'C', ' ' },
 };
 
 /**
@@ -192,7 +196,8 @@ const char *print_tainted(void)
                 *s = 0;
         } else
                 snprintf(buf, sizeof(buf), "Not tainted");
-        return(buf);
+
+        return buf;
 }
 
 int test_taint(unsigned flag)
@@ -208,7 +213,8 @@ unsigned long get_taint(void)
 
 void add_taint(unsigned flag)
 {
-        debug_locks = 0; /* can't trust the integrity of the kernel anymore */
+        /* can't trust the integrity of the kernel anymore: */
+        debug_locks = 0;
         set_bit(flag, &tainted_mask);
 }
 EXPORT_SYMBOL(add_taint);
@@ -263,8 +269,8 @@ static void do_oops_enter_exit(void)
 }
 
 /*
- * Return true if the calling CPU is allowed to print oops-related info.  This
- * is a bit racy..
+ * Return true if the calling CPU is allowed to print oops-related info.
+ * This is a bit racy..
  */
 int oops_may_print(void)
 {
@@ -273,20 +279,22 @@ int oops_may_print(void)
 
 /*
  * Called when the architecture enters its oops handler, before it prints
- * anything.  If this is the first CPU to oops, and it's oopsing the first time
- * then let it proceed.
+ * anything.  If this is the first CPU to oops, and it's oopsing the first
+ * time then let it proceed.
  *
- * This is all enabled by the pause_on_oops kernel boot option.  We do all this
- * to ensure that oopses don't scroll off the screen.  It has the side-effect
- * of preventing later-oopsing CPUs from mucking up the display, too.
+ * This is all enabled by the pause_on_oops kernel boot option.  We do all
+ * this to ensure that oopses don't scroll off the screen.  It has the
+ * side-effect of preventing later-oopsing CPUs from mucking up the display,
+ * too.
  *
- * It turns out that the CPU which is allowed to print ends up pausing for the
- * right duration, whereas all the other CPUs pause for twice as long: once in
- * oops_enter(), once in oops_exit().
+ * It turns out that the CPU which is allowed to print ends up pausing for
+ * the right duration, whereas all the other CPUs pause for twice as long:
+ * once in oops_enter(), once in oops_exit().
  */
 void oops_enter(void)
 {
-        debug_locks_off(); /* can't trust the integrity of the kernel anymore */
+        /* can't trust the integrity of the kernel anymore: */
+        debug_locks_off();
         do_oops_enter_exit();
 }
 
@@ -355,15 +363,18 @@ EXPORT_SYMBOL(warn_slowpath);
 #endif
 
 #ifdef CONFIG_CC_STACKPROTECTOR
+
 /*
  * Called when gcc's -fstack-protector feature is used, and
  * gcc detects corruption of the on-stack canary value
  */
 void __stack_chk_fail(void)
 {
-        panic("stack-protector: Kernel stack is corrupted");
+        panic("stack-protector: Kernel stack is corrupted in: %p\n",
+                __builtin_return_address(0));
 }
 EXPORT_SYMBOL(__stack_chk_fail);
+
 #endif
 
 core_param(panic, panic_timeout, int, 0644);
diff --git a/kernel/params.c b/kernel/params.c
index a1e3025b19a9..de273ec85bd2 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -24,6 +24,9 @@
 #include <linux/err.h>
 #include <linux/slab.h>
 
+/* We abuse the high bits of "perm" to record whether we kmalloc'ed. */
+#define KPARAM_KMALLOCED        0x80000000
+
 #if 0
 #define DEBUGP printk
 #else
@@ -217,7 +220,19 @@ int param_set_charp(const char *val, struct kernel_param *kp)
                 return -ENOSPC;
         }
 
-        *(char **)kp->arg = (char *)val;
+        if (kp->perm & KPARAM_KMALLOCED)
+                kfree(*(char **)kp->arg);
+
+        /* This is a hack.  We can't need to strdup in early boot, and we
+         * don't need to; this mangled commandline is preserved. */
+        if (slab_is_available()) {
+                kp->perm |= KPARAM_KMALLOCED;
+                *(char **)kp->arg = kstrdup(val, GFP_KERNEL);
+                if (!kp->arg)
+                        return -ENOMEM;
+        } else
+                *(const char **)kp->arg = val;
+
         return 0;
 }
 
@@ -571,6 +586,15 @@ void module_param_sysfs_remove(struct module *mod)
 }
 #endif
 
+void destroy_params(const struct kernel_param *params, unsigned num)
+{
+        unsigned int i;
+
+        for (i = 0; i < num; i++)
+                if (params[i].perm & KPARAM_KMALLOCED)
+                        kfree(*(char **)params[i].arg);
+}
+
 static void __init kernel_add_sysfs_param(const char *name,
                                           struct kernel_param *kparam,
                                           unsigned int name_skip)
diff --git a/kernel/pid.c b/kernel/pid.c
index 1b3586fe753a..b2e5f78fd281 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -403,6 +403,8 @@ struct pid *get_task_pid(struct task_struct *task, enum pid_type type)
 {
         struct pid *pid;
         rcu_read_lock();
+        if (type != PIDTYPE_PID)
+                task = task->group_leader;
         pid = get_pid(task->pids[type].pid);
         rcu_read_unlock();
         return pid;
@@ -450,11 +452,24 @@ pid_t pid_vnr(struct pid *pid)
 }
 EXPORT_SYMBOL_GPL(pid_vnr);
 
-pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
+pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
+                        struct pid_namespace *ns)
 {
-        return pid_nr_ns(task_pid(tsk), ns);
+        pid_t nr = 0;
+
+        rcu_read_lock();
+        if (!ns)
+                ns = current->nsproxy->pid_ns;
+        if (likely(pid_alive(task))) {
+                if (type != PIDTYPE_PID)
+                        task = task->group_leader;
+                nr = pid_nr_ns(task->pids[type].pid, ns);
+        }
+        rcu_read_unlock();
+
+        return nr;
 }
-EXPORT_SYMBOL(task_pid_nr_ns);
+EXPORT_SYMBOL(__task_pid_nr_ns);
 
 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
 {
@@ -462,18 +477,6 @@ pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
 }
 EXPORT_SYMBOL(task_tgid_nr_ns);
 
-pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
-{
-        return pid_nr_ns(task_pgrp(tsk), ns);
-}
-EXPORT_SYMBOL(task_pgrp_nr_ns);
-
-pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
-{
-        return pid_nr_ns(task_session(tsk), ns);
-}
-EXPORT_SYMBOL(task_session_nr_ns);
-
 struct pid_namespace *task_active_pid_ns(struct task_struct *tsk)
 {
         return ns_of_pid(task_pid(tsk));
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index fab8ea86fac3..2d1001b4858d 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -152,6 +152,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
 {
         int nr;
         int rc;
+        struct task_struct *task;
 
         /*
          * The last thread in the cgroup-init thread group is terminating.
@@ -169,7 +170,19 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
         read_lock(&tasklist_lock);
         nr = next_pidmap(pid_ns, 1);
         while (nr > 0) {
-                kill_proc_info(SIGKILL, SEND_SIG_PRIV, nr);
+                rcu_read_lock();
+
+                /*
+                 * Use force_sig() since it clears SIGNAL_UNKILLABLE ensuring
+                 * any nested-container's init processes don't ignore the
+                 * signal
+                 */
+                task = pid_task(find_vpid(nr), PIDTYPE_PID);
+                if (task)
+                        force_sig(SIGKILL, task);
+
+                rcu_read_unlock();
+
                 nr = next_pidmap(pid_ns, nr);
         }
         read_unlock(&tasklist_lock);
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 4318c3085788..6f7b869c011d 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -230,6 +230,71 @@ static int cpu_clock_sample(const clockid_t which_clock, struct task_struct *p,
         return 0;
 }
 
+void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
+{
+        struct sighand_struct *sighand;
+        struct signal_struct *sig;
+        struct task_struct *t;
+
+        *times = INIT_CPUTIME;
+
+        rcu_read_lock();
+        sighand = rcu_dereference(tsk->sighand);
+        if (!sighand)
+                goto out;
+
+        sig = tsk->signal;
+
+        t = tsk;
+        do {
+                times->utime = cputime_add(times->utime, t->utime);
+                times->stime = cputime_add(times->stime, t->stime);
+                times->sum_exec_runtime += t->se.sum_exec_runtime;
+
+                t = next_thread(t);
+        } while (t != tsk);
+
+        times->utime = cputime_add(times->utime, sig->utime);
+        times->stime = cputime_add(times->stime, sig->stime);
+        times->sum_exec_runtime += sig->sum_sched_runtime;
+out:
+        rcu_read_unlock();
+}
+
+static void update_gt_cputime(struct task_cputime *a, struct task_cputime *b)
+{
+        if (cputime_gt(b->utime, a->utime))
+                a->utime = b->utime;
+
+        if (cputime_gt(b->stime, a->stime))
+                a->stime = b->stime;
+
+        if (b->sum_exec_runtime > a->sum_exec_runtime)
+                a->sum_exec_runtime = b->sum_exec_runtime;
+}
+
+void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times)
+{
+        struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
+        struct task_cputime sum;
+        unsigned long flags;
+
+        spin_lock_irqsave(&cputimer->lock, flags);
+        if (!cputimer->running) {
+                cputimer->running = 1;
+                /*
+                 * The POSIX timer interface allows for absolute time expiry
+                 * values through the TIMER_ABSTIME flag, therefore we have
+                 * to synchronize the timer to the clock every time we start
+                 * it.
+                 */
+                thread_group_cputime(tsk, &sum);
+                update_gt_cputime(&cputimer->cputime, &sum);
+        }
+        *times = cputimer->cputime;
+        spin_unlock_irqrestore(&cputimer->lock, flags);
+}
+
 /*
  * Sample a process (thread group) clock for the given group_leader task.
  * Must be called with tasklist_lock held for reading.
@@ -458,7 +523,7 @@ void posix_cpu_timers_exit_group(struct task_struct *tsk)
 {
         struct task_cputime cputime;
 
-        thread_group_cputime(tsk, &cputime);
+        thread_group_cputimer(tsk, &cputime);
         cleanup_timers(tsk->signal->cpu_timers,
                        cputime.utime, cputime.stime, cputime.sum_exec_runtime);
 }
@@ -617,6 +682,33 @@ static void cpu_timer_fire(struct k_itimer *timer)
 }
 
 /*
+ * Sample a process (thread group) timer for the given group_leader task.
+ * Must be called with tasklist_lock held for reading.
+ */
+static int cpu_timer_sample_group(const clockid_t which_clock,
+                                  struct task_struct *p,
+                                  union cpu_time_count *cpu)
+{
+        struct task_cputime cputime;
+
+        thread_group_cputimer(p, &cputime);
+        switch (CPUCLOCK_WHICH(which_clock)) {
+        default:
+                return -EINVAL;
+        case CPUCLOCK_PROF:
+                cpu->cpu = cputime_add(cputime.utime, cputime.stime);
+                break;
+        case CPUCLOCK_VIRT:
+                cpu->cpu = cputime.utime;
+                break;
+        case CPUCLOCK_SCHED:
+                cpu->sched = cputime.sum_exec_runtime + task_delta_exec(p);
+                break;
+        }
+        return 0;
+}
+
+/*
  * Guts of sys_timer_settime for CPU timers.
  * This is called with the timer locked and interrupts disabled.
  * If we return TIMER_RETRY, it's necessary to release the timer's lock
@@ -677,7 +769,7 @@ int posix_cpu_timer_set(struct k_itimer *timer, int flags,
         if (CPUCLOCK_PERTHREAD(timer->it_clock)) {
                 cpu_clock_sample(timer->it_clock, p, &val);
         } else {
-                cpu_clock_sample_group(timer->it_clock, p, &val);
+                cpu_timer_sample_group(timer->it_clock, p, &val);
         }
 
         if (old) {
@@ -825,7 +917,7 @@ void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
                         read_unlock(&tasklist_lock);
                         goto dead;
                 } else {
-                        cpu_clock_sample_group(timer->it_clock, p, &now);
+                        cpu_timer_sample_group(timer->it_clock, p, &now);
                         clear_dead = (unlikely(p->exit_state) &&
                                       thread_group_empty(p));
                 }
@@ -965,6 +1057,19 @@ static void check_thread_timers(struct task_struct *tsk,
         }
 }
 
+static void stop_process_timers(struct task_struct *tsk)
+{
+        struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
+        unsigned long flags;
+
+        if (!cputimer->running)
+                return;
+
+        spin_lock_irqsave(&cputimer->lock, flags);
+        cputimer->running = 0;
+        spin_unlock_irqrestore(&cputimer->lock, flags);
+}
+
 /*
  * Check for any per-thread CPU timers that have fired and move them
  * off the tsk->*_timers list onto the firing list.  Per-thread timers
@@ -988,13 +1093,15 @@ static void check_process_timers(struct task_struct *tsk,
             sig->rlim[RLIMIT_CPU].rlim_cur == RLIM_INFINITY &&
             list_empty(&timers[CPUCLOCK_VIRT]) &&
             cputime_eq(sig->it_virt_expires, cputime_zero) &&
-            list_empty(&timers[CPUCLOCK_SCHED]))
+            list_empty(&timers[CPUCLOCK_SCHED])) {
+                stop_process_timers(tsk);
                 return;
+        }
 
         /*
          * Collect the current process totals.
          */
-        thread_group_cputime(tsk, &cputime);
+        thread_group_cputimer(tsk, &cputime);
         utime = cputime.utime;
         ptime = cputime_add(utime, cputime.stime);
         sum_sched_runtime = cputime.sum_exec_runtime;
@@ -1165,7 +1272,7 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
                         clear_dead_task(timer, now);
                         goto out_unlock;
                 }
-                cpu_clock_sample_group(timer->it_clock, p, &now);
+                cpu_timer_sample_group(timer->it_clock, p, &now);
                 bump_cpu_timer(timer, now);
                 /* Leave the tasklist_lock locked for the call below.  */
         }
@@ -1260,11 +1367,12 @@ static inline int fastpath_timer_check(struct task_struct *tsk)
         if (!task_cputime_zero(&sig->cputime_expires)) {
                 struct task_cputime group_sample;
 
-                thread_group_cputime(tsk, &group_sample);
+                thread_group_cputimer(tsk, &group_sample);
                 if (task_cputime_expired(&group_sample, &sig->cputime_expires))
                         return 1;
         }
-        return 0;
+
+        return sig->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY;
 }
 
 /*
@@ -1342,7 +1450,7 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
         struct list_head *head;
 
         BUG_ON(clock_idx == CPUCLOCK_SCHED);
-        cpu_clock_sample_group(clock_idx, tsk, &now);
+        cpu_timer_sample_group(clock_idx, tsk, &now);
 
         if (oldval) {
                 if (!cputime_eq(*oldval, cputime_zero)) {
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index d7a10167a25b..720ea4f781bd 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -3,7 +3,7 @@ ifeq ($(CONFIG_PM_DEBUG),y)
 EXTRA_CFLAGS    +=      -DDEBUG
 endif
 
-obj-y                           := main.o
+obj-$(CONFIG_PM)                += main.o
 obj-$(CONFIG_PM_SLEEP)          += console.o
 obj-$(CONFIG_FREEZER)           += process.o
 obj-$(CONFIG_HIBERNATION)       += swsusp.o disk.o snapshot.o swap.o user.o
diff --git a/kernel/power/console.c b/kernel/power/console.c
index b8628be2a465..a3961b205de7 100644
--- a/kernel/power/console.c
+++ b/kernel/power/console.c
@@ -78,6 +78,12 @@ void pm_restore_console(void)
         }
         set_console(orig_fgconsole);
         release_console_sem();
+
+        if (vt_waitactive(orig_fgconsole)) {
+                pr_debug("Resume: Can't switch VCs.");
+                return;
+        }
+
         kmsg_redirect = orig_kmsg;
 }
 #endif
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 432ee575c9ee..5f21ab2bbcdf 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -22,6 +22,7 @@
 #include <linux/console.h>
 #include <linux/cpu.h>
 #include <linux/freezer.h>
+#include <asm/suspend.h>
 
 #include "power.h"
 
@@ -214,7 +215,7 @@ static int create_image(int platform_mode)
                 return error;
 
         device_pm_lock();
-        local_irq_disable();
+
         /* At this point, device_suspend() has been called, but *not*
          * device_power_down(). We *must* call device_power_down() now.
          * Otherwise, drivers for some devices (e.g. interrupt controllers)
@@ -225,6 +226,24 @@ static int create_image(int platform_mode)
         if (error) {
                 printk(KERN_ERR "PM: Some devices failed to power down, "
                         "aborting hibernation\n");
+                goto Unlock;
+        }
+
+        error = platform_pre_snapshot(platform_mode);
+        if (error || hibernation_test(TEST_PLATFORM))
+                goto Platform_finish;
+
+        error = disable_nonboot_cpus();
+        if (error || hibernation_test(TEST_CPUS)
+            || hibernation_testmode(HIBERNATION_TEST))
+                goto Enable_cpus;
+
+        local_irq_disable();
+
+        sysdev_suspend(PMSG_FREEZE);
+        if (error) {
+                printk(KERN_ERR "PM: Some devices failed to power down, "
+                        "aborting hibernation\n");
                 goto Enable_irqs;
         }
 
@@ -241,15 +260,28 @@ static int create_image(int platform_mode)
         restore_processor_state();
         if (!in_suspend)
                 platform_leave(platform_mode);
+
  Power_up:
+        sysdev_resume();
         /* NOTE:  device_power_up() is just a resume() for devices
          * that suspended with irqs off ... no overall powerup.
          */
-        device_power_up(in_suspend ?
-                (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
+
  Enable_irqs:
         local_irq_enable();
+
+ Enable_cpus:
+        enable_nonboot_cpus();
+
+ Platform_finish:
+        platform_finish(platform_mode);
+
+        device_power_up(in_suspend ?
+                (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
+
+ Unlock:
         device_pm_unlock();
+
         return error;
 }
 
@@ -257,7 +289,7 @@ static int create_image(int platform_mode)
  *      hibernation_snapshot - quiesce devices and create the hibernation
  *      snapshot image.
  *      @platform_mode - if set, use the platform driver, if available, to
- *                       prepare the platform frimware for the power transition.
+ *                       prepare the platform firmware for the power transition.
  *
  *      Must be called with pm_mutex held
  */
@@ -283,25 +315,9 @@ int hibernation_snapshot(int platform_mode)
         if (hibernation_test(TEST_DEVICES))
                 goto Recover_platform;
 
-        error = platform_pre_snapshot(platform_mode);
-        if (error || hibernation_test(TEST_PLATFORM))
-                goto Finish;
-
-        error = disable_nonboot_cpus();
-        if (!error) {
-                if (hibernation_test(TEST_CPUS))
-                        goto Enable_cpus;
+        error = create_image(platform_mode);
+        /* Control returns here after successful restore */
 
-                if (hibernation_testmode(HIBERNATION_TEST))
-                        goto Enable_cpus;
-
-                error = create_image(platform_mode);
-                /* Control returns here after successful restore */
-        }
- Enable_cpus:
-        enable_nonboot_cpus();
- Finish:
-        platform_finish(platform_mode);
  Resume_devices:
         device_resume(in_suspend ?
                 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
@@ -323,18 +339,33 @@ int hibernation_snapshot(int platform_mode)
  *      kernel.
  */
 
-static int resume_target_kernel(void)
+static int resume_target_kernel(bool platform_mode)
 {
         int error;
 
         device_pm_lock();
-        local_irq_disable();
+
         error = device_power_down(PMSG_QUIESCE);
         if (error) {
                 printk(KERN_ERR "PM: Some devices failed to power down, "
                         "aborting resume\n");
-                goto Enable_irqs;
+                goto Unlock;
         }
+
+        error = platform_pre_restore(platform_mode);
+        if (error)
+                goto Cleanup;
+
+        error = disable_nonboot_cpus();
+        if (error)
+                goto Enable_cpus;
+
+        local_irq_disable();
+
+        error = sysdev_suspend(PMSG_QUIESCE);
+        if (error)
+                goto Enable_irqs;
+
         /* We'll ignore saved state, but this gets preempt count (etc) right */
         save_processor_state();
         error = restore_highmem();
@@ -357,10 +388,23 @@ static int resume_target_kernel(void)
         swsusp_free();
         restore_processor_state();
         touch_softlockup_watchdog();
-        device_power_up(PMSG_RECOVER);
+
+        sysdev_resume();
+
  Enable_irqs:
         local_irq_enable();
+
+ Enable_cpus:
+        enable_nonboot_cpus();
+
+ Cleanup:
+        platform_restore_cleanup(platform_mode);
+
+        device_power_up(PMSG_RECOVER);
+
+ Unlock:
         device_pm_unlock();
+
         return error;
 }
 
@@ -368,7 +412,7 @@ static int resume_target_kernel(void)
  *      hibernation_restore - quiesce devices and restore the hibernation
  *      snapshot image.  If successful, control returns in hibernation_snaphot()
  *      @platform_mode - if set, use the platform driver, if available, to
- *                       prepare the platform frimware for the transition.
+ *                       prepare the platform firmware for the transition.
  *
  *      Must be called with pm_mutex held
  */
@@ -380,19 +424,10 @@ int hibernation_restore(int platform_mode)
         pm_prepare_console();
         suspend_console();
         error = device_suspend(PMSG_QUIESCE);
-        if (error)
-                goto Finish;
-
-        error = platform_pre_restore(platform_mode);
         if (!error) {
-                error = disable_nonboot_cpus();
-                if (!error)
-                        error = resume_target_kernel();
-                enable_nonboot_cpus();
+                error = resume_target_kernel(platform_mode);
+                device_resume(PMSG_RECOVER);
         }
-        platform_restore_cleanup(platform_mode);
-        device_resume(PMSG_RECOVER);
- Finish:
         resume_console();
         pm_restore_console();
         return error;
@@ -428,37 +463,46 @@ int hibernation_platform_enter(void)
                 goto Resume_devices;
         }
 
+        device_pm_lock();
+
+        error = device_power_down(PMSG_HIBERNATE);
+        if (error)
+                goto Unlock;
+
         error = hibernation_ops->prepare();
         if (error)
-                goto Resume_devices;
+                goto Platofrm_finish;
 
         error = disable_nonboot_cpus();
         if (error)
-                goto Finish;
+                goto Platofrm_finish;
 
-        device_pm_lock();
         local_irq_disable();
-        error = device_power_down(PMSG_HIBERNATE);
-        if (!error) {
-                hibernation_ops->enter();
-                /* We should never get here */
-                while (1);
-        }
-        local_irq_enable();
-        device_pm_unlock();
+        sysdev_suspend(PMSG_HIBERNATE);
+        hibernation_ops->enter();
+        /* We should never get here */
+        while (1);
 
         /*
          * We don't need to reenable the nonboot CPUs or resume consoles, since
          * the system is going to be halted anyway.
          */
- Finish:
+ Platofrm_finish:
         hibernation_ops->finish();
+
+        device_power_up(PMSG_RESTORE);
+
+ Unlock:
+        device_pm_unlock();
+
  Resume_devices:
         entering_platform_hibernation = false;
         device_resume(PMSG_RESTORE);
         resume_console();
+
  Close:
         hibernation_ops->end();
+
         return error;
 }
 
@@ -595,6 +639,12 @@ static int software_resume(void)
         unsigned int flags;
 
         /*
+         * If the user said "noresume".. bail out early.
+         */
+        if (noresume)
+                return 0;
+
+        /*
          * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
          * is configured into the kernel. Since the regular hibernate
          * trigger path is via sysfs which takes a buffer mutex before
@@ -610,6 +660,11 @@ static int software_resume(void)
                         mutex_unlock(&pm_mutex);
                         return -ENOENT;
                 }
+                /*
+                 * Some device discovery might still be in progress; we need
+                 * to wait for this to finish.
+                 */
+                wait_for_device_probe();
                 swsusp_resume_device = name_to_dev_t(resume_file);
                 pr_debug("PM: Resume from partition %s\n", resume_file);
         } else {
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 239988873971..f172f41858bb 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -57,16 +57,6 @@ int pm_notifier_call_chain(unsigned long val)
 #ifdef CONFIG_PM_DEBUG
 int pm_test_level = TEST_NONE;
 
-static int suspend_test(int level)
-{
-        if (pm_test_level == level) {
-                printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
-                mdelay(5000);
-                return 1;
-        }
-        return 0;
-}
-
 static const char * const pm_tests[__TEST_AFTER_LAST] = {
         [TEST_NONE] = "none",
         [TEST_CORE] = "core",
@@ -125,14 +115,24 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
 }
 
 power_attr(pm_test);
-#else /* !CONFIG_PM_DEBUG */
-static inline int suspend_test(int level) { return 0; }
-#endif /* !CONFIG_PM_DEBUG */
+#endif /* CONFIG_PM_DEBUG */
 
 #endif /* CONFIG_PM_SLEEP */
 
 #ifdef CONFIG_SUSPEND
 
+static int suspend_test(int level)
+{
+#ifdef CONFIG_PM_DEBUG
+        if (pm_test_level == level) {
+                printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
+                mdelay(5000);
+                return 1;
+        }
+#endif /* !CONFIG_PM_DEBUG */
+        return 0;
+}
+
 #ifdef CONFIG_PM_TEST_SUSPEND
 
 /*
@@ -287,25 +287,55 @@ void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
  */
 static int suspend_enter(suspend_state_t state)
 {
-        int error = 0;
+        int error;
 
         device_pm_lock();
-        arch_suspend_disable_irqs();
-        BUG_ON(!irqs_disabled());
 
-        if ((error = device_power_down(PMSG_SUSPEND))) {
+        error = device_power_down(PMSG_SUSPEND);
+        if (error) {
                 printk(KERN_ERR "PM: Some devices failed to power down\n");
                 goto Done;
         }
 
-        if (!suspend_test(TEST_CORE))
-                error = suspend_ops->enter(state);
+        if (suspend_ops->prepare) {
+                error = suspend_ops->prepare();
+                if (error)
+                        goto Power_up_devices;
+        }
+
+        if (suspend_test(TEST_PLATFORM))
+                goto Platfrom_finish;
+
+        error = disable_nonboot_cpus();
+        if (error || suspend_test(TEST_CPUS))
+                goto Enable_cpus;
+
+        arch_suspend_disable_irqs();
+        BUG_ON(!irqs_disabled());
+
+        error = sysdev_suspend(PMSG_SUSPEND);
+        if (!error) {
+                if (!suspend_test(TEST_CORE))
+                        error = suspend_ops->enter(state);
+                sysdev_resume();
+        }
 
-        device_power_up(PMSG_RESUME);
- Done:
         arch_suspend_enable_irqs();
         BUG_ON(irqs_disabled());
+
+ Enable_cpus:
+        enable_nonboot_cpus();
+
+ Platfrom_finish:
+        if (suspend_ops->finish)
+                suspend_ops->finish();
+
+ Power_up_devices:
+        device_power_up(PMSG_RESUME);
+
+ Done:
         device_pm_unlock();
+
         return error;
 }
 
@@ -337,23 +367,8 @@ int suspend_devices_and_enter(suspend_state_t state)
         if (suspend_test(TEST_DEVICES))
                 goto Recover_platform;
 
-        if (suspend_ops->prepare) {
-                error = suspend_ops->prepare();
-                if (error)
-                        goto Resume_devices;
-        }
-
-        if (suspend_test(TEST_PLATFORM))
-                goto Finish;
-
-        error = disable_nonboot_cpus();
-        if (!error && !suspend_test(TEST_CPUS))
-                suspend_enter(state);
+        suspend_enter(state);
 
-        enable_nonboot_cpus();
- Finish:
-        if (suspend_ops->finish)
-                suspend_ops->finish();
  Resume_devices:
         suspend_test_start();
         device_resume(PMSG_RESUME);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index f5fc2d7680f2..33e2e4a819f9 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -321,13 +321,10 @@ static int create_mem_extents(struct list_head *list, gfp_t gfp_mask)
 
         INIT_LIST_HEAD(list);
 
-        for_each_zone(zone) {
+        for_each_populated_zone(zone) {
                 unsigned long zone_start, zone_end;
                 struct mem_extent *ext, *cur, *aux;
 
-                if (!populated_zone(zone))
-                        continue;
-
                 zone_start = zone->zone_start_pfn;
                 zone_end = zone->zone_start_pfn + zone->spanned_pages;
 
@@ -804,8 +801,8 @@ static unsigned int count_free_highmem_pages(void)
         struct zone *zone;
         unsigned int cnt = 0;
 
-        for_each_zone(zone)
-                if (populated_zone(zone) && is_highmem(zone))
+        for_each_populated_zone(zone)
+                if (is_highmem(zone))
                         cnt += zone_page_state(zone, NR_FREE_PAGES);
 
         return cnt;
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 6da14358537c..505f319e489c 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -60,6 +60,7 @@ static struct block_device *resume_bdev;
 static int submit(int rw, pgoff_t page_off, struct page *page,
                         struct bio **bio_chain)
 {
+        const int bio_rw = rw | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
         struct bio *bio;
 
         bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
@@ -80,7 +81,7 @@ static int submit(int rw, pgoff_t page_off, struct page *page,
         bio_get(bio);
 
         if (bio_chain == NULL) {
-                submit_bio(rw | (1 << BIO_RW_SYNC), bio);
+                submit_bio(bio_rw, bio);
                 wait_on_page_locked(page);
                 if (rw == READ)
                         bio_set_pages_dirty(bio);
@@ -90,7 +91,7 @@ static int submit(int rw, pgoff_t page_off, struct page *page,
                         get_page(page); /* These pages are freed later */
                 bio->bi_private = *bio_chain;
                 *bio_chain = bio;
-                submit_bio(rw | (1 << BIO_RW_SYNC), bio);
+                submit_bio(bio_rw, bio);
         }
         return 0;
 }
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index a92c91451559..78c35047586d 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -51,6 +51,7 @@
 #include <linux/highmem.h>
 #include <linux/time.h>
 #include <linux/rbtree.h>
+#include <linux/io.h>
 
 #include "power.h"
 
@@ -229,17 +230,16 @@ int swsusp_shrink_memory(void)
                 size = count_data_pages() + PAGES_FOR_IO + SPARE_PAGES;
                 tmp = size;
                 size += highmem_size;
-                for_each_zone (zone)
-                        if (populated_zone(zone)) {
-                                tmp += snapshot_additional_pages(zone);
-                                if (is_highmem(zone)) {
-                                        highmem_size -=
+                for_each_populated_zone(zone) {
+                        tmp += snapshot_additional_pages(zone);
+                        if (is_highmem(zone)) {
+                                highmem_size -=
                                         zone_page_state(zone, NR_FREE_PAGES);
-                                } else {
-                                        tmp -= zone_page_state(zone, NR_FREE_PAGES);
-                                        tmp += zone->lowmem_reserve[ZONE_NORMAL];
-                                }
+                        } else {
+                                tmp -= zone_page_state(zone, NR_FREE_PAGES);
+                                tmp += zone->lowmem_reserve[ZONE_NORMAL];
                         }
+                }
 
                 if (highmem_size < 0)
                         highmem_size = 0;
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 005b93d839ba..6c85359364f2 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -95,15 +95,15 @@ static int snapshot_open(struct inode *inode, struct file *filp)
                 data->swap = swsusp_resume_device ?
                         swap_type_of(swsusp_resume_device, 0, NULL) : -1;
                 data->mode = O_RDONLY;
-                error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
+                error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
                 if (error)
-                        pm_notifier_call_chain(PM_POST_RESTORE);
+                        pm_notifier_call_chain(PM_POST_HIBERNATION);
         } else {
                 data->swap = -1;
                 data->mode = O_WRONLY;
-                error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
+                error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
                 if (error)
-                        pm_notifier_call_chain(PM_POST_HIBERNATION);
+                        pm_notifier_call_chain(PM_POST_RESTORE);
         }
         if (error)
                 atomic_inc(&snapshot_device_available);
diff --git a/kernel/printk.c b/kernel/printk.c
index 69188f226a93..5052b5497c67 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -32,6 +32,7 @@
 #include <linux/security.h>
 #include <linux/bootmem.h>
 #include <linux/syscalls.h>
+#include <linux/kexec.h>
 
 #include <asm/uaccess.h>
 
@@ -73,7 +74,6 @@ EXPORT_SYMBOL(oops_in_progress);
  * driver system.
  */
 static DECLARE_MUTEX(console_sem);
-static DECLARE_MUTEX(secondary_console_sem);
 struct console *console_drivers;
 EXPORT_SYMBOL_GPL(console_drivers);
 
@@ -136,6 +136,24 @@ static char *log_buf = __log_buf;
 static int log_buf_len = __LOG_BUF_LEN;
 static unsigned logged_chars; /* Number of chars produced since last read+clear operation */
 
+#ifdef CONFIG_KEXEC
+/*
+ * This appends the listed symbols to /proc/vmcoreinfo
+ *
+ * /proc/vmcoreinfo is used by various utiilties, like crash and makedumpfile to
+ * obtain access to symbols that are otherwise very difficult to locate.  These
+ * symbols are specifically used so that utilities can access and extract the
+ * dmesg log from a vmcore file after a crash.
+ */
+void log_buf_kexec_setup(void)
+{
+        VMCOREINFO_SYMBOL(log_buf);
+        VMCOREINFO_SYMBOL(log_end);
+        VMCOREINFO_SYMBOL(log_buf_len);
+        VMCOREINFO_SYMBOL(logged_chars);
+}
+#endif
+
 static int __init log_buf_len_setup(char *str)
 {
         unsigned size = memparse(str, &str);
@@ -891,12 +909,14 @@ void suspend_console(void)
         printk("Suspending console(s) (use no_console_suspend to debug)\n");
         acquire_console_sem();
         console_suspended = 1;
+        up(&console_sem);
 }
 
 void resume_console(void)
 {
         if (!console_suspend_enabled)
                 return;
+        down(&console_sem);
         console_suspended = 0;
         release_console_sem();
 }
@@ -912,11 +932,9 @@ void resume_console(void)
 void acquire_console_sem(void)
 {
         BUG_ON(in_interrupt());
-        if (console_suspended) {
-                down(&secondary_console_sem);
-                return;
-        }
         down(&console_sem);
+        if (console_suspended)
+                return;
         console_locked = 1;
         console_may_schedule = 1;
 }
@@ -926,6 +944,10 @@ int try_acquire_console_sem(void)
 {
         if (down_trylock(&console_sem))
                 return -1;
+        if (console_suspended) {
+                up(&console_sem);
+                return -1;
+        }
         console_locked = 1;
         console_may_schedule = 0;
         return 0;
@@ -979,7 +1001,7 @@ void release_console_sem(void)
         unsigned wake_klogd = 0;
 
         if (console_suspended) {
-                up(&secondary_console_sem);
+                up(&console_sem);
                 return;
         }
 
@@ -1289,8 +1311,11 @@ EXPORT_SYMBOL(printk_ratelimit);
 bool printk_timed_ratelimit(unsigned long *caller_jiffies,
                         unsigned int interval_msecs)
 {
-        if (*caller_jiffies == 0 || time_after(jiffies, *caller_jiffies)) {
-                *caller_jiffies = jiffies + msecs_to_jiffies(interval_msecs);
+        if (*caller_jiffies == 0
+                        || !time_in_range(jiffies, *caller_jiffies,
+                                        *caller_jiffies
+                                        + msecs_to_jiffies(interval_msecs))) {
+                *caller_jiffies = jiffies;
                 return true;
         }
         return false;
diff --git a/kernel/profile.c b/kernel/profile.c
index 784933acf5b8..7724e0409bae 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -114,12 +114,15 @@ int __ref profile_init(void)
         if (!slab_is_available()) {
                 prof_buffer = alloc_bootmem(buffer_bytes);
                 alloc_bootmem_cpumask_var(&prof_cpu_mask);
+                cpumask_copy(prof_cpu_mask, cpu_possible_mask);
                 return 0;
         }
 
         if (!alloc_cpumask_var(&prof_cpu_mask, GFP_KERNEL))
                 return -ENOMEM;
 
+        cpumask_copy(prof_cpu_mask, cpu_possible_mask);
+
         prof_buffer = kzalloc(buffer_bytes, GFP_KERNEL);
         if (prof_buffer)
                 return 0;
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index c9cf48b21f05..aaad0ec34194 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -60,11 +60,15 @@ static void ptrace_untrace(struct task_struct *child)
 {
         spin_lock(&child->sighand->siglock);
         if (task_is_traced(child)) {
-                if (child->signal->flags & SIGNAL_STOP_STOPPED) {
+                /*
+                 * If the group stop is completed or in progress,
+                 * this thread was already counted as stopped.
+                 */
+                if (child->signal->flags & SIGNAL_STOP_STOPPED ||
+                    child->signal->group_stop_count)
                         __set_task_state(child, TASK_STOPPED);
-                } else {
+                else
                         signal_wake_up(child, 1);
-                }
         }
         spin_unlock(&child->sighand->siglock);
 }
@@ -235,18 +239,58 @@ out:
         return retval;
 }
 
-static inline void __ptrace_detach(struct task_struct *child, unsigned int data)
+/*
+ * Called with irqs disabled, returns true if childs should reap themselves.
+ */
+static int ignoring_children(struct sighand_struct *sigh)
 {
-        child->exit_code = data;
-        /* .. re-parent .. */
-        __ptrace_unlink(child);
-        /* .. and wake it up. */
-        if (child->exit_state != EXIT_ZOMBIE)
-                wake_up_process(child);
+        int ret;
+        spin_lock(&sigh->siglock);
+        ret = (sigh->action[SIGCHLD-1].sa.sa_handler == SIG_IGN) ||
+              (sigh->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT);
+        spin_unlock(&sigh->siglock);
+        return ret;
+}
+
+/*
+ * Called with tasklist_lock held for writing.
+ * Unlink a traced task, and clean it up if it was a traced zombie.
+ * Return true if it needs to be reaped with release_task().
+ * (We can't call release_task() here because we already hold tasklist_lock.)
+ *
+ * If it's a zombie, our attachedness prevented normal parent notification
+ * or self-reaping.  Do notification now if it would have happened earlier.
+ * If it should reap itself, return true.
+ *
+ * If it's our own child, there is no notification to do.
+ * But if our normal children self-reap, then this child
+ * was prevented by ptrace and we must reap it now.
+ */
+static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p)
+{
+        __ptrace_unlink(p);
+
+        if (p->exit_state == EXIT_ZOMBIE) {
+                if (!task_detached(p) && thread_group_empty(p)) {
+                        if (!same_thread_group(p->real_parent, tracer))
+                                do_notify_parent(p, p->exit_signal);
+                        else if (ignoring_children(tracer->sighand))
+                                p->exit_signal = -1;
+                }
+                if (task_detached(p)) {
+                        /* Mark it as in the process of being reaped. */
+                        p->exit_state = EXIT_DEAD;
+                        return true;
+                }
+        }
+
+        return false;
 }
 
 int ptrace_detach(struct task_struct *child, unsigned int data)
 {
+        bool dead = false;
+
         if (!valid_signal(data))
                 return -EIO;
 
@@ -255,14 +299,45 @@ int ptrace_detach(struct task_struct *child, unsigned int data)
         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 
         write_lock_irq(&tasklist_lock);
-        /* protect against de_thread()->release_task() */
-        if (child->ptrace)
-                __ptrace_detach(child, data);
+        /*
+         * This child can be already killed. Make sure de_thread() or
+         * our sub-thread doing do_wait() didn't do release_task() yet.
+         */
+        if (child->ptrace) {
+                child->exit_code = data;
+                dead = __ptrace_detach(current, child);
+        }
         write_unlock_irq(&tasklist_lock);
 
+        if (unlikely(dead))
+                release_task(child);
+
         return 0;
 }
 
+/*
+ * Detach all tasks we were using ptrace on.
+ */
+void exit_ptrace(struct task_struct *tracer)
+{
+        struct task_struct *p, *n;
+        LIST_HEAD(ptrace_dead);
+
+        write_lock_irq(&tasklist_lock);
+        list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) {
+                if (__ptrace_detach(tracer, p))
+                        list_add(&p->ptrace_entry, &ptrace_dead);
+        }
+        write_unlock_irq(&tasklist_lock);
+
+        BUG_ON(!list_empty(&tracer->ptraced));
+
+        list_for_each_entry_safe(p, n, &ptrace_dead, ptrace_entry) {
+                list_del_init(&p->ptrace_entry);
+                release_task(p);
+        }
+}
+
 int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len)
 {
         int copied = 0;
@@ -612,8 +687,6 @@ SYSCALL_DEFINE4(ptrace, long, request, long, pid, long, addr, long, data)
                 goto out_put_task_struct;
 
         ret = arch_ptrace(child, request, addr, data);
-        if (ret < 0)
-                goto out_put_task_struct;
 
  out_put_task_struct:
         put_task_struct(child);
diff --git a/kernel/rcuclassic.c b/kernel/rcuclassic.c
index bd5a9003497c..0f2b0b311304 100644
--- a/kernel/rcuclassic.c
+++ b/kernel/rcuclassic.c
@@ -65,6 +65,7 @@ static struct rcu_ctrlblk rcu_ctrlblk = {
         .lock = __SPIN_LOCK_UNLOCKED(&rcu_ctrlblk.lock),
         .cpumask = CPU_BITS_NONE,
 };
+
 static struct rcu_ctrlblk rcu_bh_ctrlblk = {
         .cur = -300,
         .completed = -300,
@@ -73,8 +74,26 @@ static struct rcu_ctrlblk rcu_bh_ctrlblk = {
         .cpumask = CPU_BITS_NONE,
 };
 
-DEFINE_PER_CPU(struct rcu_data, rcu_data) = { 0L };
-DEFINE_PER_CPU(struct rcu_data, rcu_bh_data) = { 0L };
+static DEFINE_PER_CPU(struct rcu_data, rcu_data);
+static DEFINE_PER_CPU(struct rcu_data, rcu_bh_data);
+
+/*
+ * Increment the quiescent state counter.
+ * The counter is a bit degenerated: We do not need to know
+ * how many quiescent states passed, just if there was at least
+ * one since the start of the grace period. Thus just a flag.
+ */
+void rcu_qsctr_inc(int cpu)
+{
+        struct rcu_data *rdp = &per_cpu(rcu_data, cpu);
+        rdp->passed_quiesc = 1;
+}
+
+void rcu_bh_qsctr_inc(int cpu)
+{
+        struct rcu_data *rdp = &per_cpu(rcu_bh_data, cpu);
+        rdp->passed_quiesc = 1;
+}
 
 static int blimit = 10;
 static int qhimark = 10000;
@@ -679,8 +698,8 @@ int rcu_needs_cpu(int cpu)
 void rcu_check_callbacks(int cpu, int user)
 {
         if (user ||
-            (idle_cpu(cpu) && !in_softirq() &&
-                                hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
+            (idle_cpu(cpu) && rcu_scheduler_active &&
+             !in_softirq() && hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
 
                 /*
                  * Get here if this CPU took its interrupt from user
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index d92a76a881aa..2c7b8457d0d2 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -44,6 +44,7 @@
 #include <linux/cpu.h>
 #include <linux/mutex.h>
 #include <linux/module.h>
+#include <linux/kernel_stat.h>
 
 enum rcu_barrier {
         RCU_BARRIER_STD,
@@ -55,6 +56,7 @@ static DEFINE_PER_CPU(struct rcu_head, rcu_barrier_head) = {NULL};
 static atomic_t rcu_barrier_cpu_count;
 static DEFINE_MUTEX(rcu_barrier_mutex);
 static struct completion rcu_barrier_completion;
+int rcu_scheduler_active __read_mostly;
 
 /*
  * Awaken the corresponding synchronize_rcu() instance now that a
@@ -80,6 +82,10 @@ void wakeme_after_rcu(struct rcu_head  *head)
 void synchronize_rcu(void)
 {
         struct rcu_synchronize rcu;
+
+        if (rcu_blocking_is_gp())
+                return;
+
         init_completion(&rcu.completion);
         /* Will wake me after RCU finished. */
         call_rcu(&rcu.head, wakeme_after_rcu);
@@ -116,6 +122,8 @@ static void rcu_barrier_func(void *type)
         }
 }
 
+static inline void wait_migrated_callbacks(void);
+
 /*
  * Orchestrate the specified type of RCU barrier, waiting for all
  * RCU callbacks of the specified type to complete.
@@ -141,6 +149,7 @@ static void _rcu_barrier(enum rcu_barrier type)
                 complete(&rcu_barrier_completion);
         wait_for_completion(&rcu_barrier_completion);
         mutex_unlock(&rcu_barrier_mutex);
+        wait_migrated_callbacks();
 }
 
 /**
@@ -170,8 +179,55 @@ void rcu_barrier_sched(void)
 }
 EXPORT_SYMBOL_GPL(rcu_barrier_sched);
 
+static atomic_t rcu_migrate_type_count = ATOMIC_INIT(0);
+static struct rcu_head rcu_migrate_head[3];
+static DECLARE_WAIT_QUEUE_HEAD(rcu_migrate_wq);
+
+static void rcu_migrate_callback(struct rcu_head *notused)
+{
+        if (atomic_dec_and_test(&rcu_migrate_type_count))
+                wake_up(&rcu_migrate_wq);
+}
+
+static inline void wait_migrated_callbacks(void)
+{
+        wait_event(rcu_migrate_wq, !atomic_read(&rcu_migrate_type_count));
+}
+
+static int __cpuinit rcu_barrier_cpu_hotplug(struct notifier_block *self,
+                unsigned long action, void *hcpu)
+{
+        if (action == CPU_DYING) {
+                /*
+                 * preempt_disable() in on_each_cpu() prevents stop_machine(),
+                 * so when "on_each_cpu(rcu_barrier_func, (void *)type, 1);"
+                 * returns, all online cpus have queued rcu_barrier_func(),
+                 * and the dead cpu(if it exist) queues rcu_migrate_callback()s.
+                 *
+                 * These callbacks ensure _rcu_barrier() waits for all
+                 * RCU callbacks of the specified type to complete.
+                 */
+                atomic_set(&rcu_migrate_type_count, 3);
+                call_rcu_bh(rcu_migrate_head, rcu_migrate_callback);
+                call_rcu_sched(rcu_migrate_head + 1, rcu_migrate_callback);
+                call_rcu(rcu_migrate_head + 2, rcu_migrate_callback);
+        } else if (action == CPU_POST_DEAD) {
+                /* rcu_migrate_head is protected by cpu_add_remove_lock */
+                wait_migrated_callbacks();
+        }
+
+        return NOTIFY_OK;
+}
+
 void __init rcu_init(void)
 {
         __rcu_init();
+        hotcpu_notifier(rcu_barrier_cpu_hotplug, 0);
 }
 
+void rcu_scheduler_starting(void)
+{
+        WARN_ON(num_online_cpus() != 1);
+        WARN_ON(nr_context_switches() > 0);
+        rcu_scheduler_active = 1;
+}
diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
index 33cfc50781f9..ce97a4df64d3 100644
--- a/kernel/rcupreempt.c
+++ b/kernel/rcupreempt.c
@@ -147,7 +147,51 @@ struct rcu_ctrlblk {
         wait_queue_head_t sched_wq;     /* Place for rcu_sched to sleep. */
 };
 
+struct rcu_dyntick_sched {
+        int dynticks;
+        int dynticks_snap;
+        int sched_qs;
+        int sched_qs_snap;
+        int sched_dynticks_snap;
+};
+
+static DEFINE_PER_CPU_SHARED_ALIGNED(struct rcu_dyntick_sched, rcu_dyntick_sched) = {
+        .dynticks = 1,
+};
+
+void rcu_qsctr_inc(int cpu)
+{
+        struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
+
+        rdssp->sched_qs++;
+}
+
+#ifdef CONFIG_NO_HZ
+
+void rcu_enter_nohz(void)
+{
+        static DEFINE_RATELIMIT_STATE(rs, 10 * HZ, 1);
+
+        smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */
+        __get_cpu_var(rcu_dyntick_sched).dynticks++;
+        WARN_ON_RATELIMIT(__get_cpu_var(rcu_dyntick_sched).dynticks & 0x1, &rs);
+}
+
+void rcu_exit_nohz(void)
+{
+        static DEFINE_RATELIMIT_STATE(rs, 10 * HZ, 1);
+
+        __get_cpu_var(rcu_dyntick_sched).dynticks++;
+        smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
+        WARN_ON_RATELIMIT(!(__get_cpu_var(rcu_dyntick_sched).dynticks & 0x1),
+                                &rs);
+}
+
+#endif /* CONFIG_NO_HZ */
+
+
 static DEFINE_PER_CPU(struct rcu_data, rcu_data);
+
 static struct rcu_ctrlblk rcu_ctrlblk = {
         .fliplock = __SPIN_LOCK_UNLOCKED(rcu_ctrlblk.fliplock),
         .completed = 0,
@@ -427,10 +471,6 @@ static void __rcu_advance_callbacks(struct rcu_data *rdp)
         }
 }
 
-DEFINE_PER_CPU_SHARED_ALIGNED(struct rcu_dyntick_sched, rcu_dyntick_sched) = {
-        .dynticks = 1,
-};
-
 #ifdef CONFIG_NO_HZ
 static DEFINE_PER_CPU(int, rcu_update_flag);
 
@@ -1181,6 +1221,9 @@ void __synchronize_sched(void)
 {
         struct rcu_synchronize rcu;
 
+        if (num_online_cpus() == 1)
+                return;  /* blocking is gp if only one CPU! */
+
         init_completion(&rcu.completion);
         /* Will wake me after RCU finished. */
         call_rcu_sched(&rcu.head, wakeme_after_rcu);
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 7c4142a79f0a..9b4a975a4b4a 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -126,6 +126,7 @@ static atomic_t n_rcu_torture_mberror;
 static atomic_t n_rcu_torture_error;
 static long n_rcu_torture_timers = 0;
 static struct list_head rcu_torture_removed;
+static cpumask_var_t shuffle_tmp_mask;
 
 static int stutter_pause_test = 0;
 
@@ -889,10 +890,9 @@ static int rcu_idle_cpu;	/* Force all torture tasks off this CPU */
  */
 static void rcu_torture_shuffle_tasks(void)
 {
-        cpumask_t tmp_mask;
         int i;
 
-        cpus_setall(tmp_mask);
+        cpumask_setall(shuffle_tmp_mask);
         get_online_cpus();
 
         /* No point in shuffling if there is only one online CPU (ex: UP) */
@@ -902,29 +902,29 @@ static void rcu_torture_shuffle_tasks(void)
         }
 
         if (rcu_idle_cpu != -1)
-                cpu_clear(rcu_idle_cpu, tmp_mask);
+                cpumask_clear_cpu(rcu_idle_cpu, shuffle_tmp_mask);
 
-        set_cpus_allowed_ptr(current, &tmp_mask);
+        set_cpus_allowed_ptr(current, shuffle_tmp_mask);
 
         if (reader_tasks) {
                 for (i = 0; i < nrealreaders; i++)
                         if (reader_tasks[i])
                                 set_cpus_allowed_ptr(reader_tasks[i],
-                                                     &tmp_mask);
+                                                     shuffle_tmp_mask);
         }
 
         if (fakewriter_tasks) {
                 for (i = 0; i < nfakewriters; i++)
                         if (fakewriter_tasks[i])
                                 set_cpus_allowed_ptr(fakewriter_tasks[i],
-                                                     &tmp_mask);
+                                                     shuffle_tmp_mask);
         }
 
         if (writer_task)
-                set_cpus_allowed_ptr(writer_task, &tmp_mask);
+                set_cpus_allowed_ptr(writer_task, shuffle_tmp_mask);
 
         if (stats_task)
-                set_cpus_allowed_ptr(stats_task, &tmp_mask);
+                set_cpus_allowed_ptr(stats_task, shuffle_tmp_mask);
 
         if (rcu_idle_cpu == -1)
                 rcu_idle_cpu = num_online_cpus() - 1;
@@ -1012,6 +1012,7 @@ rcu_torture_cleanup(void)
         if (shuffler_task) {
                 VERBOSE_PRINTK_STRING("Stopping rcu_torture_shuffle task");
                 kthread_stop(shuffler_task);
+                free_cpumask_var(shuffle_tmp_mask);
         }
         shuffler_task = NULL;
 
@@ -1190,10 +1191,18 @@ rcu_torture_init(void)
         }
         if (test_no_idle_hz) {
                 rcu_idle_cpu = num_online_cpus() - 1;
+
+                if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) {
+                        firsterr = -ENOMEM;
+                        VERBOSE_PRINTK_ERRSTRING("Failed to alloc mask");
+                        goto unwind;
+                }
+
                 /* Create the shuffler thread */
                 shuffler_task = kthread_run(rcu_torture_shuffle, NULL,
                                           "rcu_torture_shuffle");
                 if (IS_ERR(shuffler_task)) {
+                        free_cpumask_var(shuffle_tmp_mask);
                         firsterr = PTR_ERR(shuffler_task);
                         VERBOSE_PRINTK_ERRSTRING("Failed to create shuffler");
                         shuffler_task = NULL;
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index b2fd602a6f6f..7f3266922572 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -78,6 +78,26 @@ DEFINE_PER_CPU(struct rcu_data, rcu_data);
 struct rcu_state rcu_bh_state = RCU_STATE_INITIALIZER(rcu_bh_state);
 DEFINE_PER_CPU(struct rcu_data, rcu_bh_data);
 
+/*
+ * Increment the quiescent state counter.
+ * The counter is a bit degenerated: We do not need to know
+ * how many quiescent states passed, just if there was at least
+ * one since the start of the grace period. Thus just a flag.
+ */
+void rcu_qsctr_inc(int cpu)
+{
+        struct rcu_data *rdp = &per_cpu(rcu_data, cpu);
+        rdp->passed_quiesc = 1;
+        rdp->passed_quiesc_completed = rdp->completed;
+}
+
+void rcu_bh_qsctr_inc(int cpu)
+{
+        struct rcu_data *rdp = &per_cpu(rcu_bh_data, cpu);
+        rdp->passed_quiesc = 1;
+        rdp->passed_quiesc_completed = rdp->completed;
+}
+
 #ifdef CONFIG_NO_HZ
 DEFINE_PER_CPU(struct rcu_dynticks, rcu_dynticks) = {
         .dynticks_nesting = 1,
@@ -948,8 +968,8 @@ static void rcu_do_batch(struct rcu_data *rdp)
 void rcu_check_callbacks(int cpu, int user)
 {
         if (user ||
-            (idle_cpu(cpu) && !in_softirq() &&
-                                hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
+            (idle_cpu(cpu) && rcu_scheduler_active &&
+             !in_softirq() && hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
 
                 /*
                  * Get here if this CPU took its interrupt from user
diff --git a/kernel/rcutree.h b/kernel/rcutree.h
new file mode 100644
index 000000000000..5e872bbf07f5
--- /dev/null
+++ b/kernel/rcutree.h
@@ -0,0 +1,10 @@
+
+/*
+ * RCU implementation internal declarations:
+ */
+extern struct rcu_state rcu_state;
+DECLARE_PER_CPU(struct rcu_data, rcu_data);
+
+extern struct rcu_state rcu_bh_state;
+DECLARE_PER_CPU(struct rcu_data, rcu_bh_data);
+
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index d6db3e837826..4ee954f6a8d5 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -43,6 +43,8 @@
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
 
+#include "rcutree.h"
+
 static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
 {
         if (!rdp->beenonline)
diff --git a/kernel/relay.c b/kernel/relay.c
index 9d79b7854fa6..bc188549788f 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -677,9 +677,7 @@ int relay_late_setup_files(struct rchan *chan,
          */
         for_each_online_cpu(i) {
                 if (unlikely(!chan->buf[i])) {
-                        printk(KERN_ERR "relay_late_setup_files: CPU %u "
-                                        "has no buffer, it must have!\n", i);
-                        BUG();
+                        WARN_ONCE(1, KERN_ERR "CPU has no buffer!\n");
                         err = -EINVAL;
                         break;
                 }
@@ -750,7 +748,7 @@ size_t relay_switch_subbuf(struct rchan_buf *buf, size_t length)
                          * from the scheduler (trying to re-grab
                          * rq->lock), so defer it.
                          */
-                        __mod_timer(&buf->timer, jiffies + 1);
+                        mod_timer(&buf->timer, jiffies + 1);
         }
 
         old = buf->data;
@@ -797,13 +795,15 @@ void relay_subbufs_consumed(struct rchan *chan,
         if (!chan)
                 return;
 
-        if (cpu >= NR_CPUS || !chan->buf[cpu])
+        if (cpu >= NR_CPUS || !chan->buf[cpu] ||
+                                        subbufs_consumed > chan->n_subbufs)
                 return;
 
         buf = chan->buf[cpu];
-        buf->subbufs_consumed += subbufs_consumed;
-        if (buf->subbufs_consumed > buf->subbufs_produced)
+        if (subbufs_consumed > buf->subbufs_produced - buf->subbufs_consumed)
                 buf->subbufs_consumed = buf->subbufs_produced;
+        else
+                buf->subbufs_consumed += subbufs_consumed;
 }
 EXPORT_SYMBOL_GPL(relay_subbufs_consumed);
 
diff --git a/kernel/sched.c b/kernel/sched.c
index 6234d10c6a79..5724508c3b66 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -223,7 +223,7 @@ static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
 {
         ktime_t now;
 
-        if (rt_bandwidth_enabled() && rt_b->rt_runtime == RUNTIME_INF)
+        if (!rt_bandwidth_enabled() || rt_b->rt_runtime == RUNTIME_INF)
                 return;
 
         if (hrtimer_active(&rt_b->rt_period_timer))
@@ -231,13 +231,20 @@ static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
 
         spin_lock(&rt_b->rt_runtime_lock);
         for (;;) {
+                unsigned long delta;
+                ktime_t soft, hard;
+
                 if (hrtimer_active(&rt_b->rt_period_timer))
                         break;
 
                 now = hrtimer_cb_get_time(&rt_b->rt_period_timer);
                 hrtimer_forward(&rt_b->rt_period_timer, now, rt_b->rt_period);
-                hrtimer_start_expires(&rt_b->rt_period_timer,
-                                HRTIMER_MODE_ABS);
+
+                soft = hrtimer_get_softexpires(&rt_b->rt_period_timer);
+                hard = hrtimer_get_expires(&rt_b->rt_period_timer);
+                delta = ktime_to_ns(ktime_sub(hard, soft));
+                __hrtimer_start_range_ns(&rt_b->rt_period_timer, soft, delta,
+                                HRTIMER_MODE_ABS, 0);
         }
         spin_unlock(&rt_b->rt_runtime_lock);
 }
@@ -331,6 +338,13 @@ static DEFINE_PER_CPU(struct rt_rq, init_rt_rq) ____cacheline_aligned_in_smp;
  */
 static DEFINE_SPINLOCK(task_group_lock);
 
+#ifdef CONFIG_SMP
+static int root_task_group_empty(void)
+{
+        return list_empty(&root_task_group.children);
+}
+#endif
+
 #ifdef CONFIG_FAIR_GROUP_SCHED
 #ifdef CONFIG_USER_SCHED
 # define INIT_TASK_GROUP_LOAD   (2*NICE_0_LOAD)
@@ -391,6 +405,13 @@ static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
 
 #else
 
+#ifdef CONFIG_SMP
+static int root_task_group_empty(void)
+{
+        return 1;
+}
+#endif
+
 static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { }
 static inline struct task_group *task_group(struct task_struct *p)
 {
@@ -467,11 +488,17 @@ struct rt_rq {
         struct rt_prio_array active;
         unsigned long rt_nr_running;
 #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
-        int highest_prio; /* highest queued rt task prio */
+        struct {
+                int curr; /* highest queued rt task prio */
+#ifdef CONFIG_SMP
+                int next; /* next highest */
+#endif
+        } highest_prio;
 #endif
 #ifdef CONFIG_SMP
         unsigned long rt_nr_migratory;
         int overloaded;
+        struct plist_head pushable_tasks;
 #endif
         int rt_throttled;
         u64 rt_time;
@@ -549,7 +576,6 @@ struct rq {
         unsigned long nr_running;
         #define CPU_LOAD_IDX_MAX 5
         unsigned long cpu_load[CPU_LOAD_IDX_MAX];
-        unsigned char idle_at_tick;
 #ifdef CONFIG_NO_HZ
         unsigned long last_tick_seen;
         unsigned char in_nohz_recently;
@@ -590,6 +616,7 @@ struct rq {
         struct root_domain *rd;
         struct sched_domain *sd;
 
+        unsigned char idle_at_tick;
         /* For active balancing */
         int active_balance;
         int push_cpu;
@@ -618,9 +645,6 @@ struct rq {
         /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */
 
         /* sys_sched_yield() stats */
-        unsigned int yld_exp_empty;
-        unsigned int yld_act_empty;
-        unsigned int yld_both_empty;
         unsigned int yld_count;
 
         /* schedule() stats */
@@ -1093,7 +1117,7 @@ static void hrtick_start(struct rq *rq, u64 delay)
         if (rq == this_rq()) {
                 hrtimer_restart(timer);
         } else if (!rq->hrtick_csd_pending) {
-                __smp_call_function_single(cpu_of(rq), &rq->hrtick_csd);
+                __smp_call_function_single(cpu_of(rq), &rq->hrtick_csd, 0);
                 rq->hrtick_csd_pending = 1;
         }
 }
@@ -1129,7 +1153,8 @@ static __init void init_hrtick(void)
  */
 static void hrtick_start(struct rq *rq, u64 delay)
 {
-        hrtimer_start(&rq->hrtick_timer, ns_to_ktime(delay), HRTIMER_MODE_REL);
+        __hrtimer_start_range_ns(&rq->hrtick_timer, ns_to_ktime(delay), 0,
+                        HRTIMER_MODE_REL, 0);
 }
 
 static inline void init_hrtick(void)
@@ -1183,10 +1208,10 @@ static void resched_task(struct task_struct *p)
 
         assert_spin_locked(&task_rq(p)->lock);
 
-        if (unlikely(test_tsk_thread_flag(p, TIF_NEED_RESCHED)))
+        if (test_tsk_need_resched(p))
                 return;
 
-        set_tsk_thread_flag(p, TIF_NEED_RESCHED);
+        set_tsk_need_resched(p);
 
         cpu = task_cpu(p);
         if (cpu == smp_processor_id())
@@ -1242,7 +1267,7 @@ void wake_up_idle_cpu(int cpu)
          * lockless. The worst case is that the other CPU runs the
          * idle task through an additional NOOP schedule()
          */
-        set_tsk_thread_flag(rq->idle, TIF_NEED_RESCHED);
+        set_tsk_need_resched(rq->idle);
 
         /* NEED_RESCHED must be visible before we test polling */
         smp_mb();
@@ -1622,21 +1647,42 @@ static inline void update_shares_locked(struct rq *rq, struct sched_domain *sd)
 
 #endif
 
+#ifdef CONFIG_PREEMPT
+
 /*
- * double_lock_balance - lock the busiest runqueue, this_rq is locked already.
+ * fair double_lock_balance: Safely acquires both rq->locks in a fair
+ * way at the expense of forcing extra atomic operations in all
+ * invocations.  This assures that the double_lock is acquired using the
+ * same underlying policy as the spinlock_t on this architecture, which
+ * reduces latency compared to the unfair variant below.  However, it
+ * also adds more overhead and therefore may reduce throughput.
  */
-static int double_lock_balance(struct rq *this_rq, struct rq *busiest)
+static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
+        __releases(this_rq->lock)
+        __acquires(busiest->lock)
+        __acquires(this_rq->lock)
+{
+        spin_unlock(&this_rq->lock);
+        double_rq_lock(this_rq, busiest);
+
+        return 1;
+}
+
+#else
+/*
+ * Unfair double_lock_balance: Optimizes throughput at the expense of
+ * latency by eliminating extra atomic operations when the locks are
+ * already in proper order on entry.  This favors lower cpu-ids and will
+ * grant the double lock to lower cpus over higher ids under contention,
+ * regardless of entry order into the function.
+ */
+static int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
         __releases(this_rq->lock)
         __acquires(busiest->lock)
         __acquires(this_rq->lock)
 {
         int ret = 0;
 
-        if (unlikely(!irqs_disabled())) {
-                /* printk() doesn't work good under rq->lock */
-                spin_unlock(&this_rq->lock);
-                BUG_ON(1);
-        }
         if (unlikely(!spin_trylock(&busiest->lock))) {
                 if (busiest < this_rq) {
                         spin_unlock(&this_rq->lock);
@@ -1649,6 +1695,22 @@ static int double_lock_balance(struct rq *this_rq, struct rq *busiest)
         return ret;
 }
 
+#endif /* CONFIG_PREEMPT */
+
+/*
+ * double_lock_balance - lock the busiest runqueue, this_rq is locked already.
+ */
+static int double_lock_balance(struct rq *this_rq, struct rq *busiest)
+{
+        if (unlikely(!irqs_disabled())) {
+                /* printk() doesn't work good under rq->lock */
+                spin_unlock(&this_rq->lock);
+                BUG_ON(1);
+        }
+
+        return _double_lock_balance(this_rq, busiest);
+}
+
 static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
         __releases(busiest->lock)
 {
@@ -1717,6 +1779,9 @@ static void update_avg(u64 *avg, u64 sample)
 
 static void enqueue_task(struct rq *rq, struct task_struct *p, int wakeup)
 {
+        if (wakeup)
+                p->se.start_runtime = p->se.sum_exec_runtime;
+
         sched_info_queued(p);
         p->sched_class->enqueue_task(rq, p, wakeup);
         p->se.on_rq = 1;
@@ -1724,10 +1789,15 @@ static void enqueue_task(struct rq *rq, struct task_struct *p, int wakeup)
 
 static void dequeue_task(struct rq *rq, struct task_struct *p, int sleep)
 {
-        if (sleep && p->se.last_wakeup) {
-                update_avg(&p->se.avg_overlap,
-                           p->se.sum_exec_runtime - p->se.last_wakeup);
-                p->se.last_wakeup = 0;
+        if (sleep) {
+                if (p->se.last_wakeup) {
+                        update_avg(&p->se.avg_overlap,
+                                p->se.sum_exec_runtime - p->se.last_wakeup);
+                        p->se.last_wakeup = 0;
+                } else {
+                        update_avg(&p->se.avg_wakeup,
+                                sysctl_sched_wakeup_granularity);
+                }
         }
 
         sched_info_dequeued(p);
@@ -2029,7 +2099,7 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state)
                  * it must be off the runqueue _entirely_, and not
                  * preempted!
                  *
-                 * So if it wa still runnable (but just not actively
+                 * So if it was still runnable (but just not actively
                  * running right now), it's preempted, and we should
                  * yield - it could be a while.
                  */
@@ -2278,18 +2348,8 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
         if (!sched_feat(SYNC_WAKEUPS))
                 sync = 0;
 
-        if (!sync) {
-                if (current->se.avg_overlap < sysctl_sched_migration_cost &&
-                          p->se.avg_overlap < sysctl_sched_migration_cost)
-                        sync = 1;
-        } else {
-                if (current->se.avg_overlap >= sysctl_sched_migration_cost ||
-                          p->se.avg_overlap >= sysctl_sched_migration_cost)
-                        sync = 0;
-        }
-
 #ifdef CONFIG_SMP
-        if (sched_feat(LB_WAKEUP_UPDATE)) {
+        if (sched_feat(LB_WAKEUP_UPDATE) && !root_task_group_empty()) {
                 struct sched_domain *sd;
 
                 this_cpu = raw_smp_processor_id();
@@ -2367,6 +2427,22 @@ out_activate:
         activate_task(rq, p, 1);
         success = 1;
 
+        /*
+         * Only attribute actual wakeups done by this task.
+         */
+        if (!in_interrupt()) {
+                struct sched_entity *se = &current->se;
+                u64 sample = se->sum_exec_runtime;
+
+                if (se->last_wakeup)
+                        sample -= se->last_wakeup;
+                else
+                        sample -= se->start_runtime;
+                update_avg(&se->avg_wakeup, sample);
+
+                se->last_wakeup = se->sum_exec_runtime;
+        }
+
 out_running:
         trace_sched_wakeup(rq, p, success);
         check_preempt_curr(rq, p, sync);
@@ -2377,8 +2453,6 @@ out_running:
                 p->sched_class->task_wake_up(rq, p);
 #endif
 out:
-        current->se.last_wakeup = current->se.sum_exec_runtime;
-
         task_rq_unlock(rq, &flags);
 
         return success;
@@ -2408,6 +2482,8 @@ static void __sched_fork(struct task_struct *p)
         p->se.prev_sum_exec_runtime     = 0;
         p->se.last_wakeup               = 0;
         p->se.avg_overlap               = 0;
+        p->se.start_runtime             = 0;
+        p->se.avg_wakeup                = sysctl_sched_wakeup_granularity;
 
 #ifdef CONFIG_SCHEDSTATS
         p->se.wait_start                = 0;
@@ -2470,6 +2546,8 @@ void sched_fork(struct task_struct *p, int clone_flags)
         /* Want to start with kernel preemption disabled. */
         task_thread_info(p)->preempt_count = 1;
 #endif
+        plist_node_init(&p->pushable_tasks, MAX_PRIO);
+
         put_cpu();
 }
 
@@ -2513,7 +2591,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
 #ifdef CONFIG_PREEMPT_NOTIFIERS
 
 /**
- * preempt_notifier_register - tell me when current is being being preempted & rescheduled
+ * preempt_notifier_register - tell me when current is being preempted & rescheduled
  * @notifier: notifier struct to register
  */
 void preempt_notifier_register(struct preempt_notifier *notifier)
@@ -2610,6 +2688,12 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
 {
         struct mm_struct *mm = rq->prev_mm;
         long prev_state;
+#ifdef CONFIG_SMP
+        int post_schedule = 0;
+
+        if (current->sched_class->needs_post_schedule)
+                post_schedule = current->sched_class->needs_post_schedule(rq);
+#endif
 
         rq->prev_mm = NULL;
 
@@ -2628,7 +2712,7 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
         finish_arch_switch(prev);
         finish_lock_switch(rq, prev);
 #ifdef CONFIG_SMP
-        if (current->sched_class->post_schedule)
+        if (post_schedule)
                 current->sched_class->post_schedule(rq);
 #endif
 
@@ -2935,6 +3019,7 @@ int can_migrate_task(struct task_struct *p, struct rq *rq, int this_cpu,
                      struct sched_domain *sd, enum cpu_idle_type idle,
                      int *all_pinned)
 {
+        int tsk_cache_hot = 0;
         /*
          * We do not migrate tasks that are:
          * 1) running (obviously), or
@@ -2958,10 +3043,11 @@ int can_migrate_task(struct task_struct *p, struct rq *rq, int this_cpu,
          * 2) too many balance attempts have failed.
          */
 
-        if (!task_hot(p, rq->clock, sd) ||
-                        sd->nr_balance_failed > sd->cache_nice_tries) {
+        tsk_cache_hot = task_hot(p, rq->clock, sd);
+        if (!tsk_cache_hot ||
+                sd->nr_balance_failed > sd->cache_nice_tries) {
 #ifdef CONFIG_SCHEDSTATS
-                if (task_hot(p, rq->clock, sd)) {
+                if (tsk_cache_hot) {
                         schedstat_inc(sd, lb_hot_gained[idle]);
                         schedstat_inc(p, se.nr_forced_migrations);
                 }
@@ -2969,7 +3055,7 @@ int can_migrate_task(struct task_struct *p, struct rq *rq, int this_cpu,
                 return 1;
         }
 
-        if (task_hot(p, rq->clock, sd)) {
+        if (tsk_cache_hot) {
                 schedstat_inc(p, se.nr_failed_migrations_hot);
                 return 0;
         }
@@ -3009,6 +3095,16 @@ next:
         pulled++;
         rem_load_move -= p->se.load.weight;
 
+#ifdef CONFIG_PREEMPT
+        /*
+         * NEWIDLE balancing is a source of latency, so preemptible kernels
+         * will stop after the first task is pulled to minimize the critical
+         * section.
+         */
+        if (idle == CPU_NEWLY_IDLE)
+                goto out;
+#endif
+
         /*
          * We only want to steal up to the prescribed amount of weighted load.
          */
@@ -3055,9 +3151,15 @@ static int move_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
                                 sd, idle, all_pinned, &this_best_prio);
                 class = class->next;
 
+#ifdef CONFIG_PREEMPT
+                /*
+                 * NEWIDLE balancing is a source of latency, so preemptible
+                 * kernels will stop after the first task is pulled to minimize
+                 * the critical section.
+                 */
                 if (idle == CPU_NEWLY_IDLE && this_rq->nr_running)
                         break;
-
+#endif
         } while (class && max_load_move > total_load_moved);
 
         return total_load_moved > 0;
@@ -3107,246 +3209,480 @@ static int move_one_task(struct rq *this_rq, int this_cpu, struct rq *busiest,
 
         return 0;
 }
-
+/********** Helpers for find_busiest_group ************************/
 /*
- * find_busiest_group finds and returns the busiest CPU group within the
- * domain. It calculates and returns the amount of weighted load which
- * should be moved to restore balance via the imbalance parameter.
+ * sd_lb_stats - Structure to store the statistics of a sched_domain
+ *              during load balancing.
  */
-static struct sched_group *
-find_busiest_group(struct sched_domain *sd, int this_cpu,
-                   unsigned long *imbalance, enum cpu_idle_type idle,
-                   int *sd_idle, const struct cpumask *cpus, int *balance)
-{
-        struct sched_group *busiest = NULL, *this = NULL, *group = sd->groups;
-        unsigned long max_load, avg_load, total_load, this_load, total_pwr;
-        unsigned long max_pull;
-        unsigned long busiest_load_per_task, busiest_nr_running;
-        unsigned long this_load_per_task, this_nr_running;
-        int load_idx, group_imb = 0;
+struct sd_lb_stats {
+        struct sched_group *busiest; /* Busiest group in this sd */
+        struct sched_group *this;  /* Local group in this sd */
+        unsigned long total_load;  /* Total load of all groups in sd */
+        unsigned long total_pwr;   /*   Total power of all groups in sd */
+        unsigned long avg_load;    /* Average load across all groups in sd */
+
+        /** Statistics of this group */
+        unsigned long this_load;
+        unsigned long this_load_per_task;
+        unsigned long this_nr_running;
+
+        /* Statistics of the busiest group */
+        unsigned long max_load;
+        unsigned long busiest_load_per_task;
+        unsigned long busiest_nr_running;
+
+        int group_imb; /* Is there imbalance in this sd */
 #if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-        int power_savings_balance = 1;
-        unsigned long leader_nr_running = 0, min_load_per_task = 0;
-        unsigned long min_nr_running = ULONG_MAX;
-        struct sched_group *group_min = NULL, *group_leader = NULL;
+        int power_savings_balance; /* Is powersave balance needed for this sd */
+        struct sched_group *group_min; /* Least loaded group in sd */
+        struct sched_group *group_leader; /* Group which relieves group_min */
+        unsigned long min_load_per_task; /* load_per_task in group_min */
+        unsigned long leader_nr_running; /* Nr running of group_leader */
+        unsigned long min_nr_running; /* Nr running of group_min */
 #endif
+};
 
-        max_load = this_load = total_load = total_pwr = 0;
-        busiest_load_per_task = busiest_nr_running = 0;
-        this_load_per_task = this_nr_running = 0;
+/*
+ * sg_lb_stats - stats of a sched_group required for load_balancing
+ */
+struct sg_lb_stats {
+        unsigned long avg_load; /*Avg load across the CPUs of the group */
+        unsigned long group_load; /* Total load over the CPUs of the group */
+        unsigned long sum_nr_running; /* Nr tasks running in the group */
+        unsigned long sum_weighted_load; /* Weighted load of group's tasks */
+        unsigned long group_capacity;
+        int group_imb; /* Is there an imbalance in the group ? */
+};
 
-        if (idle == CPU_NOT_IDLE)
+/**
+ * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
+ * @group: The group whose first cpu is to be returned.
+ */
+static inline unsigned int group_first_cpu(struct sched_group *group)
+{
+        return cpumask_first(sched_group_cpus(group));
+}
+
+/**
+ * get_sd_load_idx - Obtain the load index for a given sched domain.
+ * @sd: The sched_domain whose load_idx is to be obtained.
+ * @idle: The Idle status of the CPU for whose sd load_icx is obtained.
+ */
+static inline int get_sd_load_idx(struct sched_domain *sd,
+                                        enum cpu_idle_type idle)
+{
+        int load_idx;
+
+        switch (idle) {
+        case CPU_NOT_IDLE:
                 load_idx = sd->busy_idx;
-        else if (idle == CPU_NEWLY_IDLE)
+                break;
+
+        case CPU_NEWLY_IDLE:
                 load_idx = sd->newidle_idx;
-        else
+                break;
+        default:
                 load_idx = sd->idle_idx;
+                break;
+        }
 
-        do {
-                unsigned long load, group_capacity, max_cpu_load, min_cpu_load;
-                int local_group;
-                int i;
-                int __group_imb = 0;
-                unsigned int balance_cpu = -1, first_idle_cpu = 0;
-                unsigned long sum_nr_running, sum_weighted_load;
-                unsigned long sum_avg_load_per_task;
-                unsigned long avg_load_per_task;
+        return load_idx;
+}
 
-                local_group = cpumask_test_cpu(this_cpu,
-                                               sched_group_cpus(group));
 
-                if (local_group)
-                        balance_cpu = cpumask_first(sched_group_cpus(group));
+#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
+/**
+ * init_sd_power_savings_stats - Initialize power savings statistics for
+ * the given sched_domain, during load balancing.
+ *
+ * @sd: Sched domain whose power-savings statistics are to be initialized.
+ * @sds: Variable containing the statistics for sd.
+ * @idle: Idle status of the CPU at which we're performing load-balancing.
+ */
+static inline void init_sd_power_savings_stats(struct sched_domain *sd,
+        struct sd_lb_stats *sds, enum cpu_idle_type idle)
+{
+        /*
+         * Busy processors will not participate in power savings
+         * balance.
+         */
+        if (idle == CPU_NOT_IDLE || !(sd->flags & SD_POWERSAVINGS_BALANCE))
+                sds->power_savings_balance = 0;
+        else {
+                sds->power_savings_balance = 1;
+                sds->min_nr_running = ULONG_MAX;
+                sds->leader_nr_running = 0;
+        }
+}
 
-                /* Tally up the load of all CPUs in the group */
-                sum_weighted_load = sum_nr_running = avg_load = 0;
-                sum_avg_load_per_task = avg_load_per_task = 0;
+/**
+ * update_sd_power_savings_stats - Update the power saving stats for a
+ * sched_domain while performing load balancing.
+ *
+ * @group: sched_group belonging to the sched_domain under consideration.
+ * @sds: Variable containing the statistics of the sched_domain
+ * @local_group: Does group contain the CPU for which we're performing
+ *              load balancing ?
+ * @sgs: Variable containing the statistics of the group.
+ */
+static inline void update_sd_power_savings_stats(struct sched_group *group,
+        struct sd_lb_stats *sds, int local_group, struct sg_lb_stats *sgs)
+{
 
-                max_cpu_load = 0;
-                min_cpu_load = ~0UL;
+        if (!sds->power_savings_balance)
+                return;
 
-                for_each_cpu_and(i, sched_group_cpus(group), cpus) {
-                        struct rq *rq = cpu_rq(i);
+        /*
+         * If the local group is idle or completely loaded
+         * no need to do power savings balance at this domain
+         */
+        if (local_group && (sds->this_nr_running >= sgs->group_capacity ||
+                                !sds->this_nr_running))
+                sds->power_savings_balance = 0;
 
-                        if (*sd_idle && rq->nr_running)
-                                *sd_idle = 0;
+        /*
+         * If a group is already running at full capacity or idle,
+         * don't include that group in power savings calculations
+         */
+        if (!sds->power_savings_balance ||
+                sgs->sum_nr_running >= sgs->group_capacity ||
+                !sgs->sum_nr_running)
+                return;
 
-                        /* Bias balancing toward cpus of our domain */
-                        if (local_group) {
-                                if (idle_cpu(i) && !first_idle_cpu) {
-                                        first_idle_cpu = 1;
-                                        balance_cpu = i;
-                                }
+        /*
+         * Calculate the group which has the least non-idle load.
+         * This is the group from where we need to pick up the load
+         * for saving power
+         */
+        if ((sgs->sum_nr_running < sds->min_nr_running) ||
+            (sgs->sum_nr_running == sds->min_nr_running &&
+             group_first_cpu(group) > group_first_cpu(sds->group_min))) {
+                sds->group_min = group;
+                sds->min_nr_running = sgs->sum_nr_running;
+                sds->min_load_per_task = sgs->sum_weighted_load /
+                                                sgs->sum_nr_running;
+        }
 
-                                load = target_load(i, load_idx);
-                        } else {
-                                load = source_load(i, load_idx);
-                                if (load > max_cpu_load)
-                                        max_cpu_load = load;
-                                if (min_cpu_load > load)
-                                        min_cpu_load = load;
-                        }
+        /*
+         * Calculate the group which is almost near its
+         * capacity but still has some space to pick up some load
+         * from other group and save more power
+         */
+        if (sgs->sum_nr_running > sgs->group_capacity - 1)
+                return;
 
-                        avg_load += load;
-                        sum_nr_running += rq->nr_running;
-                        sum_weighted_load += weighted_cpuload(i);
+        if (sgs->sum_nr_running > sds->leader_nr_running ||
+            (sgs->sum_nr_running == sds->leader_nr_running &&
+             group_first_cpu(group) < group_first_cpu(sds->group_leader))) {
+                sds->group_leader = group;
+                sds->leader_nr_running = sgs->sum_nr_running;
+        }
+}
 
-                        sum_avg_load_per_task += cpu_avg_load_per_task(i);
-                }
+/**
+ * check_power_save_busiest_group - see if there is potential for some power-savings balance
+ * @sds: Variable containing the statistics of the sched_domain
+ *      under consideration.
+ * @this_cpu: Cpu at which we're currently performing load-balancing.
+ * @imbalance: Variable to store the imbalance.
+ *
+ * Description:
+ * Check if we have potential to perform some power-savings balance.
+ * If yes, set the busiest group to be the least loaded group in the
+ * sched_domain, so that it's CPUs can be put to idle.
+ *
+ * Returns 1 if there is potential to perform power-savings balance.
+ * Else returns 0.
+ */
+static inline int check_power_save_busiest_group(struct sd_lb_stats *sds,
+                                        int this_cpu, unsigned long *imbalance)
+{
+        if (!sds->power_savings_balance)
+                return 0;
 
-                /*
-                 * First idle cpu or the first cpu(busiest) in this sched group
-                 * is eligible for doing load balancing at this and above
-                 * domains. In the newly idle case, we will allow all the cpu's
-                 * to do the newly idle load balance.
-                 */
-                if (idle != CPU_NEWLY_IDLE && local_group &&
-                    balance_cpu != this_cpu && balance) {
-                        *balance = 0;
-                        goto ret;
-                }
+        if (sds->this != sds->group_leader ||
+                        sds->group_leader == sds->group_min)
+                return 0;
 
-                total_load += avg_load;
-                total_pwr += group->__cpu_power;
+        *imbalance = sds->min_load_per_task;
+        sds->busiest = sds->group_min;
 
-                /* Adjust by relative CPU power of the group */
-                avg_load = sg_div_cpu_power(group,
-                                avg_load * SCHED_LOAD_SCALE);
+        if (sched_mc_power_savings >= POWERSAVINGS_BALANCE_WAKEUP) {
+                cpu_rq(this_cpu)->rd->sched_mc_preferred_wakeup_cpu =
+                        group_first_cpu(sds->group_leader);
+        }
+
+        return 1;
 
+}
+#else /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
+static inline void init_sd_power_savings_stats(struct sched_domain *sd,
+        struct sd_lb_stats *sds, enum cpu_idle_type idle)
+{
+        return;
+}
 
-                /*
-                 * Consider the group unbalanced when the imbalance is larger
-                 * than the average weight of two tasks.
-                 *
-                 * APZ: with cgroup the avg task weight can vary wildly and
-                 *      might not be a suitable number - should we keep a
-                 *      normalized nr_running number somewhere that negates
-                 *      the hierarchy?
-                 */
-                avg_load_per_task = sg_div_cpu_power(group,
-                                sum_avg_load_per_task * SCHED_LOAD_SCALE);
+static inline void update_sd_power_savings_stats(struct sched_group *group,
+        struct sd_lb_stats *sds, int local_group, struct sg_lb_stats *sgs)
+{
+        return;
+}
+
+static inline int check_power_save_busiest_group(struct sd_lb_stats *sds,
+                                        int this_cpu, unsigned long *imbalance)
+{
+        return 0;
+}
+#endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
+
+
+/**
+ * update_sg_lb_stats - Update sched_group's statistics for load balancing.
+ * @group: sched_group whose statistics are to be updated.
+ * @this_cpu: Cpu for which load balance is currently performed.
+ * @idle: Idle status of this_cpu
+ * @load_idx: Load index of sched_domain of this_cpu for load calc.
+ * @sd_idle: Idle status of the sched_domain containing group.
+ * @local_group: Does group contain this_cpu.
+ * @cpus: Set of cpus considered for load balancing.
+ * @balance: Should we balance.
+ * @sgs: variable to hold the statistics for this group.
+ */
+static inline void update_sg_lb_stats(struct sched_group *group, int this_cpu,
+                        enum cpu_idle_type idle, int load_idx, int *sd_idle,
+                        int local_group, const struct cpumask *cpus,
+                        int *balance, struct sg_lb_stats *sgs)
+{
+        unsigned long load, max_cpu_load, min_cpu_load;
+        int i;
+        unsigned int balance_cpu = -1, first_idle_cpu = 0;
+        unsigned long sum_avg_load_per_task;
+        unsigned long avg_load_per_task;
+
+        if (local_group)
+                balance_cpu = group_first_cpu(group);
+
+        /* Tally up the load of all CPUs in the group */
+        sum_avg_load_per_task = avg_load_per_task = 0;
+        max_cpu_load = 0;
+        min_cpu_load = ~0UL;
 
-                if ((max_cpu_load - min_cpu_load) > 2*avg_load_per_task)
-                        __group_imb = 1;
+        for_each_cpu_and(i, sched_group_cpus(group), cpus) {
+                struct rq *rq = cpu_rq(i);
 
-                group_capacity = group->__cpu_power / SCHED_LOAD_SCALE;
+                if (*sd_idle && rq->nr_running)
+                        *sd_idle = 0;
 
+                /* Bias balancing toward cpus of our domain */
                 if (local_group) {
-                        this_load = avg_load;
-                        this = group;
-                        this_nr_running = sum_nr_running;
-                        this_load_per_task = sum_weighted_load;
-                } else if (avg_load > max_load &&
-                           (sum_nr_running > group_capacity || __group_imb)) {
-                        max_load = avg_load;
-                        busiest = group;
-                        busiest_nr_running = sum_nr_running;
-                        busiest_load_per_task = sum_weighted_load;
-                        group_imb = __group_imb;
+                        if (idle_cpu(i) && !first_idle_cpu) {
+                                first_idle_cpu = 1;
+                                balance_cpu = i;
+                        }
+
+                        load = target_load(i, load_idx);
+                } else {
+                        load = source_load(i, load_idx);
+                        if (load > max_cpu_load)
+                                max_cpu_load = load;
+                        if (min_cpu_load > load)
+                                min_cpu_load = load;
                 }
 
-#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-                /*
-                 * Busy processors will not participate in power savings
-                 * balance.
-                 */
-                if (idle == CPU_NOT_IDLE ||
-                                !(sd->flags & SD_POWERSAVINGS_BALANCE))
-                        goto group_next;
+                sgs->group_load += load;
+                sgs->sum_nr_running += rq->nr_running;
+                sgs->sum_weighted_load += weighted_cpuload(i);
 
-                /*
-                 * If the local group is idle or completely loaded
-                 * no need to do power savings balance at this domain
-                 */
-                if (local_group && (this_nr_running >= group_capacity ||
-                                    !this_nr_running))
-                        power_savings_balance = 0;
+                sum_avg_load_per_task += cpu_avg_load_per_task(i);
+        }
 
-                /*
-                 * If a group is already running at full capacity or idle,
-                 * don't include that group in power savings calculations
-                 */
-                if (!power_savings_balance || sum_nr_running >= group_capacity
-                    || !sum_nr_running)
-                        goto group_next;
+        /*
+         * First idle cpu or the first cpu(busiest) in this sched group
+         * is eligible for doing load balancing at this and above
+         * domains. In the newly idle case, we will allow all the cpu's
+         * to do the newly idle load balance.
+         */
+        if (idle != CPU_NEWLY_IDLE && local_group &&
+            balance_cpu != this_cpu && balance) {
+                *balance = 0;
+                return;
+        }
 
-                /*
-                 * Calculate the group which has the least non-idle load.
-                 * This is the group from where we need to pick up the load
-                 * for saving power
-                 */
-                if ((sum_nr_running < min_nr_running) ||
-                    (sum_nr_running == min_nr_running &&
-                     cpumask_first(sched_group_cpus(group)) >
-                     cpumask_first(sched_group_cpus(group_min)))) {
-                        group_min = group;
-                        min_nr_running = sum_nr_running;
-                        min_load_per_task = sum_weighted_load /
-                                                sum_nr_running;
-                }
+        /* Adjust by relative CPU power of the group */
+        sgs->avg_load = sg_div_cpu_power(group,
+                        sgs->group_load * SCHED_LOAD_SCALE);
 
-                /*
-                 * Calculate the group which is almost near its
-                 * capacity but still has some space to pick up some load
-                 * from other group and save more power
-                 */
-                if (sum_nr_running <= group_capacity - 1) {
-                        if (sum_nr_running > leader_nr_running ||
-                            (sum_nr_running == leader_nr_running &&
-                             cpumask_first(sched_group_cpus(group)) <
-                             cpumask_first(sched_group_cpus(group_leader)))) {
-                                group_leader = group;
-                                leader_nr_running = sum_nr_running;
-                        }
+
+        /*
+         * Consider the group unbalanced when the imbalance is larger
+         * than the average weight of two tasks.
+         *
+         * APZ: with cgroup the avg task weight can vary wildly and
+         *      might not be a suitable number - should we keep a
+         *      normalized nr_running number somewhere that negates
+         *      the hierarchy?
+         */
+        avg_load_per_task = sg_div_cpu_power(group,
+                        sum_avg_load_per_task * SCHED_LOAD_SCALE);
+
+        if ((max_cpu_load - min_cpu_load) > 2*avg_load_per_task)
+                sgs->group_imb = 1;
+
+        sgs->group_capacity = group->__cpu_power / SCHED_LOAD_SCALE;
+
+}
+
+/**
+ * update_sd_lb_stats - Update sched_group's statistics for load balancing.
+ * @sd: sched_domain whose statistics are to be updated.
+ * @this_cpu: Cpu for which load balance is currently performed.
+ * @idle: Idle status of this_cpu
+ * @sd_idle: Idle status of the sched_domain containing group.
+ * @cpus: Set of cpus considered for load balancing.
+ * @balance: Should we balance.
+ * @sds: variable to hold the statistics for this sched_domain.
+ */
+static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu,
+                        enum cpu_idle_type idle, int *sd_idle,
+                        const struct cpumask *cpus, int *balance,
+                        struct sd_lb_stats *sds)
+{
+        struct sched_group *group = sd->groups;
+        struct sg_lb_stats sgs;
+        int load_idx;
+
+        init_sd_power_savings_stats(sd, sds, idle);
+        load_idx = get_sd_load_idx(sd, idle);
+
+        do {
+                int local_group;
+
+                local_group = cpumask_test_cpu(this_cpu,
+                                               sched_group_cpus(group));
+                memset(&sgs, 0, sizeof(sgs));
+                update_sg_lb_stats(group, this_cpu, idle, load_idx, sd_idle,
+                                local_group, cpus, balance, &sgs);
+
+                if (local_group && balance && !(*balance))
+                        return;
+
+                sds->total_load += sgs.group_load;
+                sds->total_pwr += group->__cpu_power;
+
+                if (local_group) {
+                        sds->this_load = sgs.avg_load;
+                        sds->this = group;
+                        sds->this_nr_running = sgs.sum_nr_running;
+                        sds->this_load_per_task = sgs.sum_weighted_load;
+                } else if (sgs.avg_load > sds->max_load &&
+                           (sgs.sum_nr_running > sgs.group_capacity ||
+                                sgs.group_imb)) {
+                        sds->max_load = sgs.avg_load;
+                        sds->busiest = group;
+                        sds->busiest_nr_running = sgs.sum_nr_running;
+                        sds->busiest_load_per_task = sgs.sum_weighted_load;
+                        sds->group_imb = sgs.group_imb;
                 }
-group_next:
-#endif
+
+                update_sd_power_savings_stats(group, sds, local_group, &sgs);
                 group = group->next;
         } while (group != sd->groups);
 
-        if (!busiest || this_load >= max_load || busiest_nr_running == 0)
-                goto out_balanced;
-
-        avg_load = (SCHED_LOAD_SCALE * total_load) / total_pwr;
+}
 
-        if (this_load >= avg_load ||
-                        100*max_load <= sd->imbalance_pct*this_load)
-                goto out_balanced;
+/**
+ * fix_small_imbalance - Calculate the minor imbalance that exists
+ *                      amongst the groups of a sched_domain, during
+ *                      load balancing.
+ * @sds: Statistics of the sched_domain whose imbalance is to be calculated.
+ * @this_cpu: The cpu at whose sched_domain we're performing load-balance.
+ * @imbalance: Variable to store the imbalance.
+ */
+static inline void fix_small_imbalance(struct sd_lb_stats *sds,
+                                int this_cpu, unsigned long *imbalance)
+{
+        unsigned long tmp, pwr_now = 0, pwr_move = 0;
+        unsigned int imbn = 2;
+
+        if (sds->this_nr_running) {
+                sds->this_load_per_task /= sds->this_nr_running;
+                if (sds->busiest_load_per_task >
+                                sds->this_load_per_task)
+                        imbn = 1;
+        } else
+                sds->this_load_per_task =
+                        cpu_avg_load_per_task(this_cpu);
 
-        busiest_load_per_task /= busiest_nr_running;
-        if (group_imb)
-                busiest_load_per_task = min(busiest_load_per_task, avg_load);
+        if (sds->max_load - sds->this_load + sds->busiest_load_per_task >=
+                        sds->busiest_load_per_task * imbn) {
+                *imbalance = sds->busiest_load_per_task;
+                return;
+        }
 
         /*
-         * We're trying to get all the cpus to the average_load, so we don't
-         * want to push ourselves above the average load, nor do we wish to
-         * reduce the max loaded cpu below the average load, as either of these
-         * actions would just result in more rebalancing later, and ping-pong
-         * tasks around. Thus we look for the minimum possible imbalance.
-         * Negative imbalances (*we* are more loaded than anyone else) will
-         * be counted as no imbalance for these purposes -- we can't fix that
-         * by pulling tasks to us. Be careful of negative numbers as they'll
-         * appear as very large values with unsigned longs.
+         * OK, we don't have enough imbalance to justify moving tasks,
+         * however we may be able to increase total CPU power used by
+         * moving them.
          */
-        if (max_load <= busiest_load_per_task)
-                goto out_balanced;
 
+        pwr_now += sds->busiest->__cpu_power *
+                        min(sds->busiest_load_per_task, sds->max_load);
+        pwr_now += sds->this->__cpu_power *
+                        min(sds->this_load_per_task, sds->this_load);
+        pwr_now /= SCHED_LOAD_SCALE;
+
+        /* Amount of load we'd subtract */
+        tmp = sg_div_cpu_power(sds->busiest,
+                        sds->busiest_load_per_task * SCHED_LOAD_SCALE);
+        if (sds->max_load > tmp)
+                pwr_move += sds->busiest->__cpu_power *
+                        min(sds->busiest_load_per_task, sds->max_load - tmp);
+
+        /* Amount of load we'd add */
+        if (sds->max_load * sds->busiest->__cpu_power <
+                sds->busiest_load_per_task * SCHED_LOAD_SCALE)
+                tmp = sg_div_cpu_power(sds->this,
+                        sds->max_load * sds->busiest->__cpu_power);
+        else
+                tmp = sg_div_cpu_power(sds->this,
+                        sds->busiest_load_per_task * SCHED_LOAD_SCALE);
+        pwr_move += sds->this->__cpu_power *
+                        min(sds->this_load_per_task, sds->this_load + tmp);
+        pwr_move /= SCHED_LOAD_SCALE;
+
+        /* Move if we gain throughput */
+        if (pwr_move > pwr_now)
+                *imbalance = sds->busiest_load_per_task;
+}
+
+/**
+ * calculate_imbalance - Calculate the amount of imbalance present within the
+ *                       groups of a given sched_domain during load balance.
+ * @sds: statistics of the sched_domain whose imbalance is to be calculated.
+ * @this_cpu: Cpu for which currently load balance is being performed.
+ * @imbalance: The variable to store the imbalance.
+ */
+static inline void calculate_imbalance(struct sd_lb_stats *sds, int this_cpu,
+                unsigned long *imbalance)
+{
+        unsigned long max_pull;
         /*
          * In the presence of smp nice balancing, certain scenarios can have
          * max load less than avg load(as we skip the groups at or below
          * its cpu_power, while calculating max_load..)
          */
-        if (max_load < avg_load) {
+        if (sds->max_load < sds->avg_load) {
                 *imbalance = 0;
-                goto small_imbalance;
+                return fix_small_imbalance(sds, this_cpu, imbalance);
         }
 
         /* Don't want to pull so many tasks that a group would go idle */
-        max_pull = min(max_load - avg_load, max_load - busiest_load_per_task);
+        max_pull = min(sds->max_load - sds->avg_load,
+                        sds->max_load - sds->busiest_load_per_task);
 
         /* How much load to actually move to equalise the imbalance */
-        *imbalance = min(max_pull * busiest->__cpu_power,
-                                (avg_load - this_load) * this->__cpu_power)
+        *imbalance = min(max_pull * sds->busiest->__cpu_power,
+                (sds->avg_load - sds->this_load) * sds->this->__cpu_power)
                         / SCHED_LOAD_SCALE;
 
         /*
@@ -3355,78 +3691,110 @@ group_next:
          * a think about bumping its value to force at least one task to be
          * moved
          */
-        if (*imbalance < busiest_load_per_task) {
-                unsigned long tmp, pwr_now, pwr_move;
-                unsigned int imbn;
-
-small_imbalance:
-                pwr_move = pwr_now = 0;
-                imbn = 2;
-                if (this_nr_running) {
-                        this_load_per_task /= this_nr_running;
-                        if (busiest_load_per_task > this_load_per_task)
-                                imbn = 1;
-                } else
-                        this_load_per_task = cpu_avg_load_per_task(this_cpu);
+        if (*imbalance < sds->busiest_load_per_task)
+                return fix_small_imbalance(sds, this_cpu, imbalance);
 
-                if (max_load - this_load + busiest_load_per_task >=
-                                        busiest_load_per_task * imbn) {
-                        *imbalance = busiest_load_per_task;
-                        return busiest;
-                }
+}
+/******* find_busiest_group() helpers end here *********************/
 
-                /*
-                 * OK, we don't have enough imbalance to justify moving tasks,
-                 * however we may be able to increase total CPU power used by
-                 * moving them.
-                 */
+/**
+ * find_busiest_group - Returns the busiest group within the sched_domain
+ * if there is an imbalance. If there isn't an imbalance, and
+ * the user has opted for power-savings, it returns a group whose
+ * CPUs can be put to idle by rebalancing those tasks elsewhere, if
+ * such a group exists.
+ *
+ * Also calculates the amount of weighted load which should be moved
+ * to restore balance.
+ *
+ * @sd: The sched_domain whose busiest group is to be returned.
+ * @this_cpu: The cpu for which load balancing is currently being performed.
+ * @imbalance: Variable which stores amount of weighted load which should
+ *              be moved to restore balance/put a group to idle.
+ * @idle: The idle status of this_cpu.
+ * @sd_idle: The idleness of sd
+ * @cpus: The set of CPUs under consideration for load-balancing.
+ * @balance: Pointer to a variable indicating if this_cpu
+ *      is the appropriate cpu to perform load balancing at this_level.
+ *
+ * Returns:     - the busiest group if imbalance exists.
+ *              - If no imbalance and user has opted for power-savings balance,
+ *                 return the least loaded group whose CPUs can be
+ *                 put to idle by rebalancing its tasks onto our group.
+ */
+static struct sched_group *
+find_busiest_group(struct sched_domain *sd, int this_cpu,
+                   unsigned long *imbalance, enum cpu_idle_type idle,
+                   int *sd_idle, const struct cpumask *cpus, int *balance)
+{
+        struct sd_lb_stats sds;
 
-                pwr_now += busiest->__cpu_power *
-                                min(busiest_load_per_task, max_load);
-                pwr_now += this->__cpu_power *
-                                min(this_load_per_task, this_load);
-                pwr_now /= SCHED_LOAD_SCALE;
-
-                /* Amount of load we'd subtract */
-                tmp = sg_div_cpu_power(busiest,
-                                busiest_load_per_task * SCHED_LOAD_SCALE);
-                if (max_load > tmp)
-                        pwr_move += busiest->__cpu_power *
-                                min(busiest_load_per_task, max_load - tmp);
-
-                /* Amount of load we'd add */
-                if (max_load * busiest->__cpu_power <
-                                busiest_load_per_task * SCHED_LOAD_SCALE)
-                        tmp = sg_div_cpu_power(this,
-                                        max_load * busiest->__cpu_power);
-                else
-                        tmp = sg_div_cpu_power(this,
-                                busiest_load_per_task * SCHED_LOAD_SCALE);
-                pwr_move += this->__cpu_power *
-                                min(this_load_per_task, this_load + tmp);
-                pwr_move /= SCHED_LOAD_SCALE;
+        memset(&sds, 0, sizeof(sds));
 
-                /* Move if we gain throughput */
-                if (pwr_move > pwr_now)
-                        *imbalance = busiest_load_per_task;
-        }
+        /*
+         * Compute the various statistics relavent for load balancing at
+         * this level.
+         */
+        update_sd_lb_stats(sd, this_cpu, idle, sd_idle, cpus,
+                                        balance, &sds);
+
+        /* Cases where imbalance does not exist from POV of this_cpu */
+        /* 1) this_cpu is not the appropriate cpu to perform load balancing
+         *    at this level.
+         * 2) There is no busy sibling group to pull from.
+         * 3) This group is the busiest group.
+         * 4) This group is more busy than the avg busieness at this
+         *    sched_domain.
+         * 5) The imbalance is within the specified limit.
+         * 6) Any rebalance would lead to ping-pong
+         */
+        if (balance && !(*balance))
+                goto ret;
 
-        return busiest;
+        if (!sds.busiest || sds.busiest_nr_running == 0)
+                goto out_balanced;
 
-out_balanced:
-#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-        if (idle == CPU_NOT_IDLE || !(sd->flags & SD_POWERSAVINGS_BALANCE))
-                goto ret;
+        if (sds.this_load >= sds.max_load)
+                goto out_balanced;
 
-        if (this == group_leader && group_leader != group_min) {
-                *imbalance = min_load_per_task;
-                if (sched_mc_power_savings >= POWERSAVINGS_BALANCE_WAKEUP) {
-                        cpu_rq(this_cpu)->rd->sched_mc_preferred_wakeup_cpu =
-                                cpumask_first(sched_group_cpus(group_leader));
-                }
-                return group_min;
-        }
-#endif
+        sds.avg_load = (SCHED_LOAD_SCALE * sds.total_load) / sds.total_pwr;
+
+        if (sds.this_load >= sds.avg_load)
+                goto out_balanced;
+
+        if (100 * sds.max_load <= sd->imbalance_pct * sds.this_load)
+                goto out_balanced;
+
+        sds.busiest_load_per_task /= sds.busiest_nr_running;
+        if (sds.group_imb)
+                sds.busiest_load_per_task =
+                        min(sds.busiest_load_per_task, sds.avg_load);
+
+        /*
+         * We're trying to get all the cpus to the average_load, so we don't
+         * want to push ourselves above the average load, nor do we wish to
+         * reduce the max loaded cpu below the average load, as either of these
+         * actions would just result in more rebalancing later, and ping-pong
+         * tasks around. Thus we look for the minimum possible imbalance.
+         * Negative imbalances (*we* are more loaded than anyone else) will
+         * be counted as no imbalance for these purposes -- we can't fix that
+         * by pulling tasks to us. Be careful of negative numbers as they'll
+         * appear as very large values with unsigned longs.
+         */
+        if (sds.max_load <= sds.busiest_load_per_task)
+                goto out_balanced;
+
+        /* Looks like there is an imbalance. Compute it */
+        calculate_imbalance(&sds, this_cpu, imbalance);
+        return sds.busiest;
+
+out_balanced:
+        /*
+         * There is no obvious imbalance. But check if we can do some balancing
+         * to save power.
+         */
+        if (check_power_save_busiest_group(&sds, this_cpu, imbalance))
+                return sds.busiest;
 ret:
         *imbalance = 0;
         return NULL;
@@ -3470,19 +3838,23 @@ find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle,
  */
 #define MAX_PINNED_INTERVAL     512
 
+/* Working cpumask for load_balance and load_balance_newidle. */
+static DEFINE_PER_CPU(cpumask_var_t, load_balance_tmpmask);
+
 /*
  * Check this_cpu to ensure it is balanced within domain. Attempt to move
  * tasks if there is an imbalance.
  */
 static int load_balance(int this_cpu, struct rq *this_rq,
                         struct sched_domain *sd, enum cpu_idle_type idle,
-                        int *balance, struct cpumask *cpus)
+                        int *balance)
 {
         int ld_moved, all_pinned = 0, active_balance = 0, sd_idle = 0;
         struct sched_group *group;
         unsigned long imbalance;
         struct rq *busiest;
         unsigned long flags;
+        struct cpumask *cpus = __get_cpu_var(load_balance_tmpmask);
 
         cpumask_setall(cpus);
 
@@ -3637,8 +4009,7 @@ out:
  * this_rq is locked.
  */
 static int
-load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd,
-                        struct cpumask *cpus)
+load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd)
 {
         struct sched_group *group;
         struct rq *busiest = NULL;
@@ -3646,6 +4017,7 @@ load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd,
         int ld_moved = 0;
         int sd_idle = 0;
         int all_pinned = 0;
+        struct cpumask *cpus = __get_cpu_var(load_balance_tmpmask);
 
         cpumask_setall(cpus);
 
@@ -3786,10 +4158,6 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
         struct sched_domain *sd;
         int pulled_task = 0;
         unsigned long next_balance = jiffies + HZ;
-        cpumask_var_t tmpmask;
-
-        if (!alloc_cpumask_var(&tmpmask, GFP_ATOMIC))
-                return;
 
         for_each_domain(this_cpu, sd) {
                 unsigned long interval;
@@ -3800,7 +4168,7 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
                 if (sd->flags & SD_BALANCE_NEWIDLE)
                         /* If we've pulled tasks over stop searching: */
                         pulled_task = load_balance_newidle(this_cpu, this_rq,
-                                                           sd, tmpmask);
+                                                           sd);
 
                 interval = msecs_to_jiffies(sd->balance_interval);
                 if (time_after(next_balance, sd->last_balance + interval))
@@ -3815,7 +4183,6 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
                  */
                 this_rq->next_balance = next_balance;
         }
-        free_cpumask_var(tmpmask);
 }
 
 /*
@@ -3902,19 +4269,24 @@ int select_nohz_load_balancer(int stop_tick)
         int cpu = smp_processor_id();
 
         if (stop_tick) {
-                cpumask_set_cpu(cpu, nohz.cpu_mask);
                 cpu_rq(cpu)->in_nohz_recently = 1;
 
-                /*
-                 * If we are going offline and still the leader, give up!
-                 */
-                if (!cpu_active(cpu) &&
-                    atomic_read(&nohz.load_balancer) == cpu) {
+                if (!cpu_active(cpu)) {
+                        if (atomic_read(&nohz.load_balancer) != cpu)
+                                return 0;
+
+                        /*
+                         * If we are going offline and still the leader,
+                         * give up!
+                         */
                         if (atomic_cmpxchg(&nohz.load_balancer, cpu, -1) != cpu)
                                 BUG();
+
                         return 0;
                 }
 
+                cpumask_set_cpu(cpu, nohz.cpu_mask);
+
                 /* time for ilb owner also to sleep */
                 if (cpumask_weight(nohz.cpu_mask) == num_online_cpus()) {
                         if (atomic_read(&nohz.load_balancer) == cpu)
@@ -3960,11 +4332,6 @@ static void rebalance_domains(int cpu, enum cpu_idle_type idle)
         unsigned long next_balance = jiffies + 60*HZ;
         int update_next_balance = 0;
         int need_serialize;
-        cpumask_var_t tmp;
-
-        /* Fails alloc?  Rebalancing probably not a priority right now. */
-        if (!alloc_cpumask_var(&tmp, GFP_ATOMIC))
-                return;
 
         for_each_domain(cpu, sd) {
                 if (!(sd->flags & SD_LOAD_BALANCE))
@@ -3989,7 +4356,7 @@ static void rebalance_domains(int cpu, enum cpu_idle_type idle)
                 }
 
                 if (time_after_eq(jiffies, sd->last_balance + interval)) {
-                        if (load_balance(cpu, rq, sd, idle, &balance, tmp)) {
+                        if (load_balance(cpu, rq, sd, idle, &balance)) {
                                 /*
                                  * We've pulled tasks over so either we're no
                                  * longer idle, or one of our SMT siblings is
@@ -4023,8 +4390,6 @@ out:
          */
         if (likely(update_next_balance))
                 rq->next_balance = next_balance;
-
-        free_cpumask_var(tmp);
 }
 
 /*
@@ -4074,6 +4439,11 @@ static void run_rebalance_domains(struct softirq_action *h)
 #endif
 }
 
+static inline int on_null_domain(int cpu)
+{
+        return !rcu_dereference(cpu_rq(cpu)->sd);
+}
+
 /*
  * Trigger the SCHED_SOFTIRQ if it is time to do periodic load balancing.
  *
@@ -4131,7 +4501,9 @@ static inline void trigger_load_balance(struct rq *rq, int cpu)
             cpumask_test_cpu(cpu, nohz.cpu_mask))
                 return;
 #endif
-        if (time_after_eq(jiffies, rq->next_balance))
+        /* Don't need to rebalance while attached to NULL domain */
+        if (time_after_eq(jiffies, rq->next_balance) &&
+            likely(!on_null_domain(cpu)))
                 raise_softirq(SCHED_SOFTIRQ);
 }
 
@@ -4474,10 +4846,7 @@ void scheduler_tick(void)
 #endif
 }
 
-#if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \
-                                defined(CONFIG_PREEMPT_TRACER))
-
-static inline unsigned long get_parent_ip(unsigned long addr)
+unsigned long get_parent_ip(unsigned long addr)
 {
         if (in_lock_functions(addr)) {
                 addr = CALLER_ADDR2;
@@ -4487,6 +4856,9 @@ static inline unsigned long get_parent_ip(unsigned long addr)
         return addr;
 }
 
+#if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \
+                                defined(CONFIG_PREEMPT_TRACER))
+
 void __kprobes add_preempt_count(int val)
 {
 #ifdef CONFIG_DEBUG_PREEMPT
@@ -4578,11 +4950,33 @@ static inline void schedule_debug(struct task_struct *prev)
 #endif
 }
 
+static void put_prev_task(struct rq *rq, struct task_struct *prev)
+{
+        if (prev->state == TASK_RUNNING) {
+                u64 runtime = prev->se.sum_exec_runtime;
+
+                runtime -= prev->se.prev_sum_exec_runtime;
+                runtime = min_t(u64, runtime, 2*sysctl_sched_migration_cost);
+
+                /*
+                 * In order to avoid avg_overlap growing stale when we are
+                 * indeed overlapping and hence not getting put to sleep, grow
+                 * the avg_overlap on preemption.
+                 *
+                 * We use the average preemption runtime because that
+                 * correlates to the amount of cache footprint a task can
+                 * build up.
+                 */
+                update_avg(&prev->se.avg_overlap, runtime);
+        }
+        prev->sched_class->put_prev_task(rq, prev);
+}
+
 /*
  * Pick up the highest-prio task:
  */
 static inline struct task_struct *
-pick_next_task(struct rq *rq, struct task_struct *prev)
+pick_next_task(struct rq *rq)
 {
         const struct sched_class *class;
         struct task_struct *p;
@@ -4654,8 +5048,8 @@ need_resched_nonpreemptible:
         if (unlikely(!rq->nr_running))
                 idle_balance(cpu, rq);
 
-        prev->sched_class->put_prev_task(rq, prev);
-        next = pick_next_task(rq, prev);
+        put_prev_task(rq, prev);
+        next = pick_next_task(rq);
 
         if (likely(prev != next)) {
                 sched_info_switch(prev, next);
@@ -4777,7 +5171,7 @@ asmlinkage void __sched preempt_schedule(void)
                  * between schedule and now.
                  */
                 barrier();
-        } while (unlikely(test_thread_flag(TIF_NEED_RESCHED)));
+        } while (need_resched());
 }
 EXPORT_SYMBOL(preempt_schedule);
 
@@ -4806,7 +5200,7 @@ asmlinkage void __sched preempt_schedule_irq(void)
                  * between schedule and now.
                  */
                 barrier();
-        } while (unlikely(test_thread_flag(TIF_NEED_RESCHED)));
+        } while (need_resched());
 }
 
 #endif /* CONFIG_PREEMPT */
@@ -4867,11 +5261,17 @@ void __wake_up_locked(wait_queue_head_t *q, unsigned int mode)
         __wake_up_common(q, mode, 1, 0, NULL);
 }
 
+void __wake_up_locked_key(wait_queue_head_t *q, unsigned int mode, void *key)
+{
+        __wake_up_common(q, mode, 1, 0, key);
+}
+
 /**
- * __wake_up_sync - wake up threads blocked on a waitqueue.
+ * __wake_up_sync_key - wake up threads blocked on a waitqueue.
  * @q: the waitqueue
  * @mode: which threads
  * @nr_exclusive: how many wake-one or wake-many threads to wake up
+ * @key: opaque value to be passed to wakeup targets
  *
  * The sync wakeup differs that the waker knows that it will schedule
  * away soon, so while the target thread will be woken up, it will not
@@ -4880,8 +5280,8 @@ void __wake_up_locked(wait_queue_head_t *q, unsigned int mode)
  *
  * On UP it can prevent extra preemption.
  */
-void
-__wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr_exclusive)
+void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode,
+                        int nr_exclusive, void *key)
 {
         unsigned long flags;
         int sync = 1;
@@ -4893,9 +5293,18 @@ __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr_exclusive)
                 sync = 0;
 
         spin_lock_irqsave(&q->lock, flags);
-        __wake_up_common(q, mode, nr_exclusive, sync, NULL);
+        __wake_up_common(q, mode, nr_exclusive, sync, key);
         spin_unlock_irqrestore(&q->lock, flags);
 }
+EXPORT_SYMBOL_GPL(__wake_up_sync_key);
+
+/*
+ * __wake_up_sync - see __wake_up_sync_key()
+ */
+void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr_exclusive)
+{
+        __wake_up_sync_key(q, mode, nr_exclusive, NULL);
+}
 EXPORT_SYMBOL_GPL(__wake_up_sync);      /* For internal use only */
 
 /**
@@ -5280,7 +5689,7 @@ SYSCALL_DEFINE1(nice, int, increment)
         if (increment > 40)
                 increment = 40;
 
-        nice = PRIO_TO_NICE(current->static_prio) + increment;
+        nice = TASK_NICE(current) + increment;
         if (nice < -20)
                 nice = -20;
         if (nice > 19)
@@ -6079,12 +6488,7 @@ void sched_show_task(struct task_struct *p)
                 printk(KERN_CONT " %016lx ", thread_saved_pc(p));
 #endif
 #ifdef CONFIG_DEBUG_STACK_USAGE
-        {
-                unsigned long *n = end_of_stack(p);
-                while (!*n)
-                        n++;
-                free = (unsigned long)n - (unsigned long)end_of_stack(p);
-        }
+        free = stack_not_used(p);
 #endif
         printk(KERN_CONT "%5lu %5d %6d\n", free,
                 task_pid_nr(p), task_pid_nr(p->real_parent));
@@ -6558,7 +6962,7 @@ static void migrate_dead_tasks(unsigned int dead_cpu)
                 if (!rq->nr_running)
                         break;
                 update_rq_clock(rq);
-                next = pick_next_task(rq, rq->curr);
+                next = pick_next_task(rq);
                 if (!next)
                         break;
                 next->sched_class->put_prev_task(rq, next);
@@ -7080,20 +7484,26 @@ static void free_rootdomain(struct root_domain *rd)
 
 static void rq_attach_root(struct rq *rq, struct root_domain *rd)
 {
+        struct root_domain *old_rd = NULL;
         unsigned long flags;
 
         spin_lock_irqsave(&rq->lock, flags);
 
         if (rq->rd) {
-                struct root_domain *old_rd = rq->rd;
+                old_rd = rq->rd;
 
                 if (cpumask_test_cpu(rq->cpu, old_rd->online))
                         set_rq_offline(rq);
 
                 cpumask_clear_cpu(rq->cpu, old_rd->span);
 
-                if (atomic_dec_and_test(&old_rd->refcount))
-                        free_rootdomain(old_rd);
+                /*
+                 * If we dont want to free the old_rt yet then
+                 * set old_rd to NULL to skip the freeing later
+                 * in this function:
+                 */
+                if (!atomic_dec_and_test(&old_rd->refcount))
+                        old_rd = NULL;
         }
 
         atomic_inc(&rd->refcount);
@@ -7104,6 +7514,9 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
                 set_rq_online(rq);
 
         spin_unlock_irqrestore(&rq->lock, flags);
+
+        if (old_rd)
+                free_rootdomain(old_rd);
 }
 
 static int __init_refok init_rootdomain(struct root_domain *rd, bool bootmem)
@@ -7381,7 +7794,7 @@ cpu_to_core_group(int cpu, const struct cpumask *cpu_map,
 {
         int group;
 
-        cpumask_and(mask, &per_cpu(cpu_sibling_map, cpu), cpu_map);
+        cpumask_and(mask, topology_thread_cpumask(cpu), cpu_map);
         group = cpumask_first(mask);
         if (sg)
                 *sg = &per_cpu(sched_group_core, group).sg;
@@ -7410,7 +7823,7 @@ cpu_to_phys_group(int cpu, const struct cpumask *cpu_map,
         cpumask_and(mask, cpu_coregroup_mask(cpu), cpu_map);
         group = cpumask_first(mask);
 #elif defined(CONFIG_SCHED_SMT)
-        cpumask_and(mask, &per_cpu(cpu_sibling_map, cpu), cpu_map);
+        cpumask_and(mask, topology_thread_cpumask(cpu), cpu_map);
         group = cpumask_first(mask);
 #else
         group = cpu;
@@ -7753,7 +8166,7 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
                 SD_INIT(sd, SIBLING);
                 set_domain_attribute(sd, attr);
                 cpumask_and(sched_domain_span(sd),
-                            &per_cpu(cpu_sibling_map, i), cpu_map);
+                            topology_thread_cpumask(i), cpu_map);
                 sd->parent = p;
                 p->child = sd;
                 cpu_to_cpu_group(i, cpu_map, &sd->groups, tmpmask);
@@ -7764,7 +8177,7 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
         /* Set up CPU (sibling) groups */
         for_each_cpu(i, cpu_map) {
                 cpumask_and(this_sibling_map,
-                            &per_cpu(cpu_sibling_map, i), cpu_map);
+                            topology_thread_cpumask(i), cpu_map);
                 if (i != cpumask_first(this_sibling_map))
                         continue;
 
@@ -8345,11 +8758,15 @@ static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
         __set_bit(MAX_RT_PRIO, array->bitmap);
 
 #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
-        rt_rq->highest_prio = MAX_RT_PRIO;
+        rt_rq->highest_prio.curr = MAX_RT_PRIO;
+#ifdef CONFIG_SMP
+        rt_rq->highest_prio.next = MAX_RT_PRIO;
+#endif
 #endif
 #ifdef CONFIG_SMP
         rt_rq->rt_nr_migratory = 0;
         rt_rq->overloaded = 0;
+        plist_head_init(&rq->rt.pushable_tasks, &rq->lock);
 #endif
 
         rt_rq->rt_time = 0;
@@ -8436,6 +8853,9 @@ void __init sched_init(void)
 #ifdef CONFIG_USER_SCHED
         alloc_size *= 2;
 #endif
+#ifdef CONFIG_CPUMASK_OFFSTACK
+        alloc_size += num_possible_cpus() * cpumask_size();
+#endif
         /*
          * As sched_init() is called before page_alloc is setup,
          * we use alloc_bootmem().
@@ -8473,6 +8893,12 @@ void __init sched_init(void)
                 ptr += nr_cpu_ids * sizeof(void **);
 #endif /* CONFIG_USER_SCHED */
 #endif /* CONFIG_RT_GROUP_SCHED */
+#ifdef CONFIG_CPUMASK_OFFSTACK
+                for_each_possible_cpu(i) {
+                        per_cpu(load_balance_tmpmask, i) = (void *)ptr;
+                        ptr += cpumask_size();
+                }
+#endif /* CONFIG_CPUMASK_OFFSTACK */
         }
 
 #ifdef CONFIG_SMP
@@ -9351,6 +9777,16 @@ static int sched_rt_global_constraints(void)
 
         return ret;
 }
+
+int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk)
+{
+        /* Don't accept realtime tasks when there is no way for them to run */
+        if (rt_task(tsk) && tg->rt_bandwidth.rt_runtime == 0)
+                return 0;
+
+        return 1;
+}
+
 #else /* !CONFIG_RT_GROUP_SCHED */
 static int sched_rt_global_constraints(void)
 {
@@ -9444,8 +9880,7 @@ cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
                       struct task_struct *tsk)
 {
 #ifdef CONFIG_RT_GROUP_SCHED
-        /* Don't accept realtime tasks when there is no way for them to run */
-        if (rt_task(tsk) && cgroup_tg(cgrp)->rt_bandwidth.rt_runtime == 0)
+        if (!sched_rt_can_attach(cgroup_tg(cgrp), tsk))
                 return -EINVAL;
 #else
         /* We don't support RT-tasks being in separate groups */
@@ -9624,7 +10059,7 @@ cpuacct_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
 
 static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu)
 {
-        u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
+        u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
         u64 data;
 
 #ifndef CONFIG_64BIT
@@ -9643,7 +10078,7 @@ static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu)
 
 static void cpuacct_cpuusage_write(struct cpuacct *ca, int cpu, u64 val)
 {
-        u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
+        u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
 
 #ifndef CONFIG_64BIT
         /*
@@ -9754,7 +10189,7 @@ static void cpuacct_charge(struct task_struct *tsk, u64 cputime)
         struct cpuacct *ca;
         int cpu;
 
-        if (!cpuacct_subsys.active)
+        if (unlikely(!cpuacct_subsys.active))
                 return;
 
         cpu = task_cpu(tsk);
@@ -9764,7 +10199,7 @@ static void cpuacct_charge(struct task_struct *tsk, u64 cputime)
         ca = task_ca(tsk);
 
         for (; ca; ca = ca->parent) {
-                u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
+                u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
                 *cpuusage += cputime;
         }
 
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index a0b0852414cc..819f17ac796e 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -24,11 +24,12 @@
  * The clock: sched_clock_cpu() is monotonic per cpu, and should be somewhat
  * consistent between cpus (never more than 2 jiffies difference).
  */
-#include <linux/sched.h>
-#include <linux/percpu.h>
 #include <linux/spinlock.h>
-#include <linux/ktime.h>
+#include <linux/hardirq.h>
 #include <linux/module.h>
+#include <linux/percpu.h>
+#include <linux/ktime.h>
+#include <linux/sched.h>
 
 /*
  * Scheduler clock - returns current time in nanosec units.
@@ -43,6 +44,7 @@ unsigned long long __attribute__((weak)) sched_clock(void)
 static __read_mostly int sched_clock_running;
 
 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
+__read_mostly int sched_clock_stable;
 
 struct sched_clock_data {
         /*
@@ -87,7 +89,7 @@ void sched_clock_init(void)
 }
 
 /*
- * min,max except they take wrapping into account
+ * min, max except they take wrapping into account
  */
 
 static inline u64 wrap_min(u64 x, u64 y)
@@ -111,15 +113,13 @@ static u64 __update_sched_clock(struct sched_clock_data *scd, u64 now)
         s64 delta = now - scd->tick_raw;
         u64 clock, min_clock, max_clock;
 
-        WARN_ON_ONCE(!irqs_disabled());
-
         if (unlikely(delta < 0))
                 delta = 0;
 
         /*
          * scd->clock = clamp(scd->tick_gtod + delta,
-         *                    max(scd->tick_gtod, scd->clock),
-         *                    scd->tick_gtod + TICK_NSEC);
+         *                    max(scd->tick_gtod, scd->clock),
+         *                    scd->tick_gtod + TICK_NSEC);
          */
 
         clock = scd->tick_gtod + delta;
@@ -148,8 +148,20 @@ static void lock_double_clock(struct sched_clock_data *data1,
 
 u64 sched_clock_cpu(int cpu)
 {
-        struct sched_clock_data *scd = cpu_sdc(cpu);
         u64 now, clock, this_clock, remote_clock;
+        struct sched_clock_data *scd;
+
+        if (sched_clock_stable)
+                return sched_clock();
+
+        scd = cpu_sdc(cpu);
+
+        /*
+         * Normally this is not called in NMI context - but if it is,
+         * trying to do any locking here is totally lethal.
+         */
+        if (unlikely(in_nmi()))
+                return scd->clock;
 
         if (unlikely(!sched_clock_running))
                 return 0ull;
@@ -195,14 +207,18 @@ u64 sched_clock_cpu(int cpu)
 
 void sched_clock_tick(void)
 {
-        struct sched_clock_data *scd = this_scd();
+        struct sched_clock_data *scd;
         u64 now, now_gtod;
 
+        if (sched_clock_stable)
+                return;
+
         if (unlikely(!sched_clock_running))
                 return;
 
         WARN_ON_ONCE(!irqs_disabled());
 
+        scd = this_scd();
         now_gtod = ktime_to_ns(ktime_get());
         now = sched_clock();
 
@@ -250,7 +266,7 @@ u64 sched_clock_cpu(int cpu)
         return sched_clock();
 }
 
-#endif
+#endif /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
 
 unsigned long long cpu_clock(int cpu)
 {
diff --git a/kernel/sched_cpupri.h b/kernel/sched_cpupri.h
index 642a94ef8a0a..9a7e859b8fbf 100644
--- a/kernel/sched_cpupri.h
+++ b/kernel/sched_cpupri.h
@@ -25,7 +25,7 @@ struct cpupri {
 
 #ifdef CONFIG_SMP
 int  cpupri_find(struct cpupri *cp,
-                 struct task_struct *p, cpumask_t *lowest_mask);
+                 struct task_struct *p, struct cpumask *lowest_mask);
 void cpupri_set(struct cpupri *cp, int cpu, int pri);
 int cpupri_init(struct cpupri *cp, bool bootmem);
 void cpupri_cleanup(struct cpupri *cp);
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 16eeba4e4169..467ca72f1657 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -272,7 +272,6 @@ static void print_cpu(struct seq_file *m, int cpu)
         P(nr_switches);
         P(nr_load_updates);
         P(nr_uninterruptible);
-        SEQ_printf(m, "  .%-30s: %lu\n", "jiffies", jiffies);
         PN(next_balance);
         P(curr->pid);
         PN(clock);
@@ -287,9 +286,6 @@ static void print_cpu(struct seq_file *m, int cpu)
 #ifdef CONFIG_SCHEDSTATS
 #define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, rq->n);
 
-        P(yld_exp_empty);
-        P(yld_act_empty);
-        P(yld_both_empty);
         P(yld_count);
 
         P(sched_switch);
@@ -314,7 +310,7 @@ static int sched_debug_show(struct seq_file *m, void *v)
         u64 now = ktime_to_ns(ktime_get());
         int cpu;
 
-        SEQ_printf(m, "Sched Debug Version: v0.08, %s %.*s\n",
+        SEQ_printf(m, "Sched Debug Version: v0.09, %s %.*s\n",
                 init_utsname()->release,
                 (int)strcspn(init_utsname()->version, " "),
                 init_utsname()->version);
@@ -325,6 +321,7 @@ static int sched_debug_show(struct seq_file *m, void *v)
         SEQ_printf(m, "  .%-40s: %Ld\n", #x, (long long)(x))
 #define PN(x) \
         SEQ_printf(m, "  .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
+        P(jiffies);
         PN(sysctl_sched_latency);
         PN(sysctl_sched_min_granularity);
         PN(sysctl_sched_wakeup_granularity);
@@ -397,6 +394,7 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
         PN(se.vruntime);
         PN(se.sum_exec_runtime);
         PN(se.avg_overlap);
+        PN(se.avg_wakeup);
 
         nr_switches = p->nvcsw + p->nivcsw;
 
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index a7e50ba185ac..3816f217f119 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1191,15 +1191,20 @@ wake_affine(struct sched_domain *this_sd, struct rq *this_rq,
             int idx, unsigned long load, unsigned long this_load,
             unsigned int imbalance)
 {
+        struct task_struct *curr = this_rq->curr;
+        struct task_group *tg;
         unsigned long tl = this_load;
         unsigned long tl_per_task;
-        struct task_group *tg;
         unsigned long weight;
         int balanced;
 
         if (!(this_sd->flags & SD_WAKE_AFFINE) || !sched_feat(AFFINE_WAKEUPS))
                 return 0;
 
+        if (sync && (curr->se.avg_overlap > sysctl_sched_migration_cost ||
+                        p->se.avg_overlap > sysctl_sched_migration_cost))
+                sync = 0;
+
         /*
          * If sync wakeup then subtract the (maximum possible)
          * effect of the currently running task from the load
@@ -1309,16 +1314,63 @@ out:
 }
 #endif /* CONFIG_SMP */
 
-static unsigned long wakeup_gran(struct sched_entity *se)
+/*
+ * Adaptive granularity
+ *
+ * se->avg_wakeup gives the average time a task runs until it does a wakeup,
+ * with the limit of wakeup_gran -- when it never does a wakeup.
+ *
+ * So the smaller avg_wakeup is the faster we want this task to preempt,
+ * but we don't want to treat the preemptee unfairly and therefore allow it
+ * to run for at least the amount of time we'd like to run.
+ *
+ * NOTE: we use 2*avg_wakeup to increase the probability of actually doing one
+ *
+ * NOTE: we use *nr_running to scale with load, this nicely matches the
+ *       degrading latency on load.
+ */
+static unsigned long
+adaptive_gran(struct sched_entity *curr, struct sched_entity *se)
+{
+        u64 this_run = curr->sum_exec_runtime - curr->prev_sum_exec_runtime;
+        u64 expected_wakeup = 2*se->avg_wakeup * cfs_rq_of(se)->nr_running;
+        u64 gran = 0;
+
+        if (this_run < expected_wakeup)
+                gran = expected_wakeup - this_run;
+
+        return min_t(s64, gran, sysctl_sched_wakeup_granularity);
+}
+
+static unsigned long
+wakeup_gran(struct sched_entity *curr, struct sched_entity *se)
 {
         unsigned long gran = sysctl_sched_wakeup_granularity;
 
+        if (cfs_rq_of(curr)->curr && sched_feat(ADAPTIVE_GRAN))
+                gran = adaptive_gran(curr, se);
+
         /*
-         * More easily preempt - nice tasks, while not making it harder for
-         * + nice tasks.
+         * Since its curr running now, convert the gran from real-time
+         * to virtual-time in his units.
          */
-        if (!sched_feat(ASYM_GRAN) || se->load.weight > NICE_0_LOAD)
-                gran = calc_delta_fair(sysctl_sched_wakeup_granularity, se);
+        if (sched_feat(ASYM_GRAN)) {
+                /*
+                 * By using 'se' instead of 'curr' we penalize light tasks, so
+                 * they get preempted easier. That is, if 'se' < 'curr' then
+                 * the resulting gran will be larger, therefore penalizing the
+                 * lighter, if otoh 'se' > 'curr' then the resulting gran will
+                 * be smaller, again penalizing the lighter task.
+                 *
+                 * This is especially important for buddies when the leftmost
+                 * task is higher priority than the buddy.
+                 */
+                if (unlikely(se->load.weight != NICE_0_LOAD))
+                        gran = calc_delta_fair(gran, se);
+        } else {
+                if (unlikely(curr->load.weight != NICE_0_LOAD))
+                        gran = calc_delta_fair(gran, curr);
+        }
 
         return gran;
 }
@@ -1345,7 +1397,7 @@ wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se)
         if (vdiff <= 0)
                 return -1;
 
-        gran = wakeup_gran(curr);
+        gran = wakeup_gran(curr, se);
         if (vdiff > gran)
                 return 1;
 
@@ -1426,7 +1478,9 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int sync)
         if (!sched_feat(WAKEUP_PREEMPT))
                 return;
 
-        if (sched_feat(WAKEUP_OVERLAP) && sync) {
+        if (sched_feat(WAKEUP_OVERLAP) && (sync ||
+                        (se->avg_overlap < sysctl_sched_migration_cost &&
+                         pse->avg_overlap < sysctl_sched_migration_cost))) {
                 resched_task(curr);
                 return;
         }
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index 07bc02e99ab1..4569bfa7df9b 100644
--- a/kernel/sched_features.h
+++ b/kernel/sched_features.h
@@ -1,5 +1,6 @@
 SCHED_FEAT(NEW_FAIR_SLEEPERS, 1)
-SCHED_FEAT(NORMALIZED_SLEEPER, 1)
+SCHED_FEAT(NORMALIZED_SLEEPER, 0)
+SCHED_FEAT(ADAPTIVE_GRAN, 1)
 SCHED_FEAT(WAKEUP_PREEMPT, 1)
 SCHED_FEAT(START_DEBIT, 1)
 SCHED_FEAT(AFFINE_WAKEUPS, 1)
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index fbec5a58ff10..f2c66f8f9712 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -3,6 +3,40 @@
  * policies)
  */
 
+static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
+{
+        return container_of(rt_se, struct task_struct, rt);
+}
+
+#ifdef CONFIG_RT_GROUP_SCHED
+
+static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
+{
+        return rt_rq->rq;
+}
+
+static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se)
+{
+        return rt_se->rt_rq;
+}
+
+#else /* CONFIG_RT_GROUP_SCHED */
+
+static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
+{
+        return container_of(rt_rq, struct rq, rt);
+}
+
+static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se)
+{
+        struct task_struct *p = rt_task_of(rt_se);
+        struct rq *rq = task_rq(p);
+
+        return &rq->rt;
+}
+
+#endif /* CONFIG_RT_GROUP_SCHED */
+
 #ifdef CONFIG_SMP
 
 static inline int rt_overloaded(struct rq *rq)
@@ -37,25 +71,69 @@ static inline void rt_clear_overload(struct rq *rq)
         cpumask_clear_cpu(rq->cpu, rq->rd->rto_mask);
 }
 
-static void update_rt_migration(struct rq *rq)
+static void update_rt_migration(struct rt_rq *rt_rq)
 {
-        if (rq->rt.rt_nr_migratory && (rq->rt.rt_nr_running > 1)) {
-                if (!rq->rt.overloaded) {
-                        rt_set_overload(rq);
-                        rq->rt.overloaded = 1;
+        if (rt_rq->rt_nr_migratory && (rt_rq->rt_nr_running > 1)) {
+                if (!rt_rq->overloaded) {
+                        rt_set_overload(rq_of_rt_rq(rt_rq));
+                        rt_rq->overloaded = 1;
                 }
-        } else if (rq->rt.overloaded) {
-                rt_clear_overload(rq);
-                rq->rt.overloaded = 0;
+        } else if (rt_rq->overloaded) {
+                rt_clear_overload(rq_of_rt_rq(rt_rq));
+                rt_rq->overloaded = 0;
         }
 }
-#endif /* CONFIG_SMP */
 
-static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
+static void inc_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
+{
+        if (rt_se->nr_cpus_allowed > 1)
+                rt_rq->rt_nr_migratory++;
+
+        update_rt_migration(rt_rq);
+}
+
+static void dec_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
+{
+        if (rt_se->nr_cpus_allowed > 1)
+                rt_rq->rt_nr_migratory--;
+
+        update_rt_migration(rt_rq);
+}
+
+static void enqueue_pushable_task(struct rq *rq, struct task_struct *p)
+{
+        plist_del(&p->pushable_tasks, &rq->rt.pushable_tasks);
+        plist_node_init(&p->pushable_tasks, p->prio);
+        plist_add(&p->pushable_tasks, &rq->rt.pushable_tasks);
+}
+
+static void dequeue_pushable_task(struct rq *rq, struct task_struct *p)
+{
+        plist_del(&p->pushable_tasks, &rq->rt.pushable_tasks);
+}
+
+#else
+
+static inline void enqueue_pushable_task(struct rq *rq, struct task_struct *p)
 {
-        return container_of(rt_se, struct task_struct, rt);
 }
 
+static inline void dequeue_pushable_task(struct rq *rq, struct task_struct *p)
+{
+}
+
+static inline
+void inc_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
+{
+}
+
+static inline
+void dec_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
+{
+}
+
+#endif /* CONFIG_SMP */
+
 static inline int on_rt_rq(struct sched_rt_entity *rt_se)
 {
         return !list_empty(&rt_se->run_list);
@@ -79,16 +157,6 @@ static inline u64 sched_rt_period(struct rt_rq *rt_rq)
 #define for_each_leaf_rt_rq(rt_rq, rq) \
         list_for_each_entry_rcu(rt_rq, &rq->leaf_rt_rq_list, leaf_rt_rq_list)
 
-static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
-{
-        return rt_rq->rq;
-}
-
-static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se)
-{
-        return rt_se->rt_rq;
-}
-
 #define for_each_sched_rt_entity(rt_se) \
         for (; rt_se; rt_se = rt_se->parent)
 
@@ -108,7 +176,7 @@ static void sched_rt_rq_enqueue(struct rt_rq *rt_rq)
         if (rt_rq->rt_nr_running) {
                 if (rt_se && !on_rt_rq(rt_se))
                         enqueue_rt_entity(rt_se);
-                if (rt_rq->highest_prio < curr->prio)
+                if (rt_rq->highest_prio.curr < curr->prio)
                         resched_task(curr);
         }
 }
@@ -176,19 +244,6 @@ static inline u64 sched_rt_period(struct rt_rq *rt_rq)
 #define for_each_leaf_rt_rq(rt_rq, rq) \
         for (rt_rq = &rq->rt; rt_rq; rt_rq = NULL)
 
-static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
-{
-        return container_of(rt_rq, struct rq, rt);
-}
-
-static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se)
-{
-        struct task_struct *p = rt_task_of(rt_se);
-        struct rq *rq = task_rq(p);
-
-        return &rq->rt;
-}
-
 #define for_each_sched_rt_entity(rt_se) \
         for (; rt_se; rt_se = NULL)
 
@@ -473,7 +528,7 @@ static inline int rt_se_prio(struct sched_rt_entity *rt_se)
         struct rt_rq *rt_rq = group_rt_rq(rt_se);
 
         if (rt_rq)
-                return rt_rq->highest_prio;
+                return rt_rq->highest_prio.curr;
 #endif
 
         return rt_task_of(rt_se)->prio;
@@ -547,91 +602,174 @@ static void update_curr_rt(struct rq *rq)
         }
 }
 
-static inline
-void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
+#if defined CONFIG_SMP
+
+static struct task_struct *pick_next_highest_task_rt(struct rq *rq, int cpu);
+
+static inline int next_prio(struct rq *rq)
 {
-        WARN_ON(!rt_prio(rt_se_prio(rt_se)));
-        rt_rq->rt_nr_running++;
-#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
-        if (rt_se_prio(rt_se) < rt_rq->highest_prio) {
-#ifdef CONFIG_SMP
-                struct rq *rq = rq_of_rt_rq(rt_rq);
-#endif
+        struct task_struct *next = pick_next_highest_task_rt(rq, rq->cpu);
+
+        if (next && rt_prio(next->prio))
+                return next->prio;
+        else
+                return MAX_RT_PRIO;
+}
+
+static void
+inc_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio)
+{
+        struct rq *rq = rq_of_rt_rq(rt_rq);
+
+        if (prio < prev_prio) {
+
+                /*
+                 * If the new task is higher in priority than anything on the
+                 * run-queue, we know that the previous high becomes our
+                 * next-highest.
+                 */
+                rt_rq->highest_prio.next = prev_prio;
 
-                rt_rq->highest_prio = rt_se_prio(rt_se);
-#ifdef CONFIG_SMP
                 if (rq->online)
-                        cpupri_set(&rq->rd->cpupri, rq->cpu,
-                                   rt_se_prio(rt_se));
-#endif
-        }
-#endif
-#ifdef CONFIG_SMP
-        if (rt_se->nr_cpus_allowed > 1) {
-                struct rq *rq = rq_of_rt_rq(rt_rq);
+                        cpupri_set(&rq->rd->cpupri, rq->cpu, prio);
 
-                rq->rt.rt_nr_migratory++;
-        }
+        } else if (prio == rt_rq->highest_prio.curr)
+                /*
+                 * If the next task is equal in priority to the highest on
+                 * the run-queue, then we implicitly know that the next highest
+                 * task cannot be any lower than current
+                 */
+                rt_rq->highest_prio.next = prio;
+        else if (prio < rt_rq->highest_prio.next)
+                /*
+                 * Otherwise, we need to recompute next-highest
+                 */
+                rt_rq->highest_prio.next = next_prio(rq);
+}
 
-        update_rt_migration(rq_of_rt_rq(rt_rq));
-#endif
-#ifdef CONFIG_RT_GROUP_SCHED
-        if (rt_se_boosted(rt_se))
-                rt_rq->rt_nr_boosted++;
+static void
+dec_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio)
+{
+        struct rq *rq = rq_of_rt_rq(rt_rq);
 
-        if (rt_rq->tg)
-                start_rt_bandwidth(&rt_rq->tg->rt_bandwidth);
-#else
-        start_rt_bandwidth(&def_rt_bandwidth);
-#endif
+        if (rt_rq->rt_nr_running && (prio <= rt_rq->highest_prio.next))
+                rt_rq->highest_prio.next = next_prio(rq);
+
+        if (rq->online && rt_rq->highest_prio.curr != prev_prio)
+                cpupri_set(&rq->rd->cpupri, rq->cpu, rt_rq->highest_prio.curr);
 }
 
+#else /* CONFIG_SMP */
+
 static inline
-void dec_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
-{
-#ifdef CONFIG_SMP
-        int highest_prio = rt_rq->highest_prio;
-#endif
+void inc_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio) {}
+static inline
+void dec_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio) {}
+
+#endif /* CONFIG_SMP */
 
-        WARN_ON(!rt_prio(rt_se_prio(rt_se)));
-        WARN_ON(!rt_rq->rt_nr_running);
-        rt_rq->rt_nr_running--;
 #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
+static void
+inc_rt_prio(struct rt_rq *rt_rq, int prio)
+{
+        int prev_prio = rt_rq->highest_prio.curr;
+
+        if (prio < prev_prio)
+                rt_rq->highest_prio.curr = prio;
+
+        inc_rt_prio_smp(rt_rq, prio, prev_prio);
+}
+
+static void
+dec_rt_prio(struct rt_rq *rt_rq, int prio)
+{
+        int prev_prio = rt_rq->highest_prio.curr;
+
         if (rt_rq->rt_nr_running) {
-                struct rt_prio_array *array;
 
-                WARN_ON(rt_se_prio(rt_se) < rt_rq->highest_prio);
-                if (rt_se_prio(rt_se) == rt_rq->highest_prio) {
-                        /* recalculate */
-                        array = &rt_rq->active;
-                        rt_rq->highest_prio =
+                WARN_ON(prio < prev_prio);
+
+                /*
+                 * This may have been our highest task, and therefore
+                 * we may have some recomputation to do
+                 */
+                if (prio == prev_prio) {
+                        struct rt_prio_array *array = &rt_rq->active;
+
+                        rt_rq->highest_prio.curr =
                                 sched_find_first_bit(array->bitmap);
-                } /* otherwise leave rq->highest prio alone */
+                }
+
         } else
-                rt_rq->highest_prio = MAX_RT_PRIO;
-#endif
-#ifdef CONFIG_SMP
-        if (rt_se->nr_cpus_allowed > 1) {
-                struct rq *rq = rq_of_rt_rq(rt_rq);
-                rq->rt.rt_nr_migratory--;
-        }
+                rt_rq->highest_prio.curr = MAX_RT_PRIO;
 
-        if (rt_rq->highest_prio != highest_prio) {
-                struct rq *rq = rq_of_rt_rq(rt_rq);
+        dec_rt_prio_smp(rt_rq, prio, prev_prio);
+}
 
-                if (rq->online)
-                        cpupri_set(&rq->rd->cpupri, rq->cpu,
-                                   rt_rq->highest_prio);
-        }
+#else
+
+static inline void inc_rt_prio(struct rt_rq *rt_rq, int prio) {}
+static inline void dec_rt_prio(struct rt_rq *rt_rq, int prio) {}
+
+#endif /* CONFIG_SMP || CONFIG_RT_GROUP_SCHED */
 
-        update_rt_migration(rq_of_rt_rq(rt_rq));
-#endif /* CONFIG_SMP */
 #ifdef CONFIG_RT_GROUP_SCHED
+
+static void
+inc_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
+{
+        if (rt_se_boosted(rt_se))
+                rt_rq->rt_nr_boosted++;
+
+        if (rt_rq->tg)
+                start_rt_bandwidth(&rt_rq->tg->rt_bandwidth);
+}
+
+static void
+dec_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
+{
         if (rt_se_boosted(rt_se))
                 rt_rq->rt_nr_boosted--;
 
         WARN_ON(!rt_rq->rt_nr_running && rt_rq->rt_nr_boosted);
-#endif
+}
+
+#else /* CONFIG_RT_GROUP_SCHED */
+
+static void
+inc_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
+{
+        start_rt_bandwidth(&def_rt_bandwidth);
+}
+
+static inline
+void dec_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) {}
+
+#endif /* CONFIG_RT_GROUP_SCHED */
+
+static inline
+void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
+{
+        int prio = rt_se_prio(rt_se);
+
+        WARN_ON(!rt_prio(prio));
+        rt_rq->rt_nr_running++;
+
+        inc_rt_prio(rt_rq, prio);
+        inc_rt_migration(rt_se, rt_rq);
+        inc_rt_group(rt_se, rt_rq);
+}
+
+static inline
+void dec_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
+{
+        WARN_ON(!rt_prio(rt_se_prio(rt_se)));
+        WARN_ON(!rt_rq->rt_nr_running);
+        rt_rq->rt_nr_running--;
+
+        dec_rt_prio(rt_rq, rt_se_prio(rt_se));
+        dec_rt_migration(rt_se, rt_rq);
+        dec_rt_group(rt_se, rt_rq);
 }
 
 static void __enqueue_rt_entity(struct sched_rt_entity *rt_se)
@@ -718,6 +856,9 @@ static void enqueue_task_rt(struct rq *rq, struct task_struct *p, int wakeup)
 
         enqueue_rt_entity(rt_se);
 
+        if (!task_current(rq, p) && p->rt.nr_cpus_allowed > 1)
+                enqueue_pushable_task(rq, p);
+
         inc_cpu_load(rq, p->se.load.weight);
 }
 
@@ -728,6 +869,8 @@ static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep)
         update_curr_rt(rq);
         dequeue_rt_entity(rt_se);
 
+        dequeue_pushable_task(rq, p);
+
         dec_cpu_load(rq, p->se.load.weight);
 }
 
@@ -871,7 +1014,7 @@ static struct sched_rt_entity *pick_next_rt_entity(struct rq *rq,
         return next;
 }
 
-static struct task_struct *pick_next_task_rt(struct rq *rq)
+static struct task_struct *_pick_next_task_rt(struct rq *rq)
 {
         struct sched_rt_entity *rt_se;
         struct task_struct *p;
@@ -893,6 +1036,18 @@ static struct task_struct *pick_next_task_rt(struct rq *rq)
 
         p = rt_task_of(rt_se);
         p->se.exec_start = rq->clock;
+
+        return p;
+}
+
+static struct task_struct *pick_next_task_rt(struct rq *rq)
+{
+        struct task_struct *p = _pick_next_task_rt(rq);
+
+        /* The running task is never eligible for pushing */
+        if (p)
+                dequeue_pushable_task(rq, p);
+
         return p;
 }
 
@@ -900,6 +1055,13 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
 {
         update_curr_rt(rq);
         p->se.exec_start = 0;
+
+        /*
+         * The previous task needs to be made eligible for pushing
+         * if it is still active
+         */
+        if (p->se.on_rq && p->rt.nr_cpus_allowed > 1)
+                enqueue_pushable_task(rq, p);
 }
 
 #ifdef CONFIG_SMP
@@ -953,12 +1115,13 @@ static struct task_struct *pick_next_highest_task_rt(struct rq *rq, int cpu)
 
 static DEFINE_PER_CPU(cpumask_var_t, local_cpu_mask);
 
-static inline int pick_optimal_cpu(int this_cpu, cpumask_t *mask)
+static inline int pick_optimal_cpu(int this_cpu,
+                                   const struct cpumask *mask)
 {
         int first;
 
         /* "this_cpu" is cheaper to preempt than a remote processor */
-        if ((this_cpu != -1) && cpu_isset(this_cpu, *mask))
+        if ((this_cpu != -1) && cpumask_test_cpu(this_cpu, mask))
                 return this_cpu;
 
         first = cpumask_first(mask);
@@ -974,6 +1137,7 @@ static int find_lowest_rq(struct task_struct *task)
         struct cpumask *lowest_mask = __get_cpu_var(local_cpu_mask);
         int this_cpu = smp_processor_id();
         int cpu      = task_cpu(task);
+        cpumask_var_t domain_mask;
 
         if (task->rt.nr_cpus_allowed == 1)
                 return -1; /* No other targets possible */
@@ -1006,19 +1170,25 @@ static int find_lowest_rq(struct task_struct *task)
         if (this_cpu == cpu)
                 this_cpu = -1; /* Skip this_cpu opt if the same */
 
-        for_each_domain(cpu, sd) {
-                if (sd->flags & SD_WAKE_AFFINE) {
-                        cpumask_t domain_mask;
-                        int       best_cpu;
+        if (alloc_cpumask_var(&domain_mask, GFP_ATOMIC)) {
+                for_each_domain(cpu, sd) {
+                        if (sd->flags & SD_WAKE_AFFINE) {
+                                int best_cpu;
+
+                                cpumask_and(domain_mask,
+                                            sched_domain_span(sd),
+                                            lowest_mask);
 
-                        cpumask_and(&domain_mask, sched_domain_span(sd),
-                                    lowest_mask);
+                                best_cpu = pick_optimal_cpu(this_cpu,
+                                                            domain_mask);
 
-                        best_cpu = pick_optimal_cpu(this_cpu,
-                                                    &domain_mask);
-                        if (best_cpu != -1)
-                                return best_cpu;
+                                if (best_cpu != -1) {
+                                        free_cpumask_var(domain_mask);
+                                        return best_cpu;
+                                }
+                        }
                 }
+                free_cpumask_var(domain_mask);
         }
 
         /*
@@ -1065,7 +1235,7 @@ static struct rq *find_lock_lowest_rq(struct task_struct *task, struct rq *rq)
                 }
 
                 /* If this rq is still suitable use it. */
-                if (lowest_rq->rt.highest_prio > task->prio)
+                if (lowest_rq->rt.highest_prio.curr > task->prio)
                         break;
 
                 /* try again */
@@ -1076,6 +1246,31 @@ static struct rq *find_lock_lowest_rq(struct task_struct *task, struct rq *rq)
         return lowest_rq;
 }
 
+static inline int has_pushable_tasks(struct rq *rq)
+{
+        return !plist_head_empty(&rq->rt.pushable_tasks);
+}
+
+static struct task_struct *pick_next_pushable_task(struct rq *rq)
+{
+        struct task_struct *p;
+
+        if (!has_pushable_tasks(rq))
+                return NULL;
+
+        p = plist_first_entry(&rq->rt.pushable_tasks,
+                              struct task_struct, pushable_tasks);
+
+        BUG_ON(rq->cpu != task_cpu(p));
+        BUG_ON(task_current(rq, p));
+        BUG_ON(p->rt.nr_cpus_allowed <= 1);
+
+        BUG_ON(!p->se.on_rq);
+        BUG_ON(!rt_task(p));
+
+        return p;
+}
+
 /*
  * If the current CPU has more than one RT task, see if the non
  * running task can migrate over to a CPU that is running a task
@@ -1085,13 +1280,11 @@ static int push_rt_task(struct rq *rq)
 {
         struct task_struct *next_task;
         struct rq *lowest_rq;
-        int ret = 0;
-        int paranoid = RT_MAX_TRIES;
 
         if (!rq->rt.overloaded)
                 return 0;
 
-        next_task = pick_next_highest_task_rt(rq, -1);
+        next_task = pick_next_pushable_task(rq);
         if (!next_task)
                 return 0;
 
@@ -1120,16 +1313,34 @@ static int push_rt_task(struct rq *rq)
                 struct task_struct *task;
                 /*
                  * find lock_lowest_rq releases rq->lock
-                 * so it is possible that next_task has changed.
-                 * If it has, then try again.
+                 * so it is possible that next_task has migrated.
+                 *
+                 * We need to make sure that the task is still on the same
+                 * run-queue and is also still the next task eligible for
+                 * pushing.
                  */
-                task = pick_next_highest_task_rt(rq, -1);
-                if (unlikely(task != next_task) && task && paranoid--) {
-                        put_task_struct(next_task);
-                        next_task = task;
-                        goto retry;
+                task = pick_next_pushable_task(rq);
+                if (task_cpu(next_task) == rq->cpu && task == next_task) {
+                        /*
+                         * If we get here, the task hasnt moved at all, but
+                         * it has failed to push.  We will not try again,
+                         * since the other cpus will pull from us when they
+                         * are ready.
+                         */
+                        dequeue_pushable_task(rq, next_task);
+                        goto out;
                 }
-                goto out;
+
+                if (!task)
+                        /* No more tasks, just exit */
+                        goto out;
+
+                /*
+                 * Something has shifted, try again.
+                 */
+                put_task_struct(next_task);
+                next_task = task;
+                goto retry;
         }
 
         deactivate_task(rq, next_task, 0);
@@ -1140,23 +1351,12 @@ static int push_rt_task(struct rq *rq)
 
         double_unlock_balance(rq, lowest_rq);
 
-        ret = 1;
 out:
         put_task_struct(next_task);
 
-        return ret;
+        return 1;
 }
 
-/*
- * TODO: Currently we just use the second highest prio task on
- *       the queue, and stop when it can't migrate (or there's
- *       no more RT tasks).  There may be a case where a lower
- *       priority RT task has a different affinity than the
- *       higher RT task. In this case the lower RT task could
- *       possibly be able to migrate where as the higher priority
- *       RT task could not.  We currently ignore this issue.
- *       Enhancements are welcome!
- */
 static void push_rt_tasks(struct rq *rq)
 {
         /* push_rt_task will return true if it moved an RT */
@@ -1167,33 +1367,35 @@ static void push_rt_tasks(struct rq *rq)
 static int pull_rt_task(struct rq *this_rq)
 {
         int this_cpu = this_rq->cpu, ret = 0, cpu;
-        struct task_struct *p, *next;
+        struct task_struct *p;
         struct rq *src_rq;
 
         if (likely(!rt_overloaded(this_rq)))
                 return 0;
 
-        next = pick_next_task_rt(this_rq);
-
         for_each_cpu(cpu, this_rq->rd->rto_mask) {
                 if (this_cpu == cpu)
                         continue;
 
                 src_rq = cpu_rq(cpu);
+
+                /*
+                 * Don't bother taking the src_rq->lock if the next highest
+                 * task is known to be lower-priority than our current task.
+                 * This may look racy, but if this value is about to go
+                 * logically higher, the src_rq will push this task away.
+                 * And if its going logically lower, we do not care
+                 */
+                if (src_rq->rt.highest_prio.next >=
+                    this_rq->rt.highest_prio.curr)
+                        continue;
+
                 /*
                  * We can potentially drop this_rq's lock in
                  * double_lock_balance, and another CPU could
-                 * steal our next task - hence we must cause
-                 * the caller to recalculate the next task
-                 * in that case:
+                 * alter this_rq
                  */
-                if (double_lock_balance(this_rq, src_rq)) {
-                        struct task_struct *old_next = next;
-
-                        next = pick_next_task_rt(this_rq);
-                        if (next != old_next)
-                                ret = 1;
-                }
+                double_lock_balance(this_rq, src_rq);
 
                 /*
                  * Are there still pullable RT tasks?
@@ -1207,7 +1409,7 @@ static int pull_rt_task(struct rq *this_rq)
                  * Do we have an RT task that preempts
                  * the to-be-scheduled task?
                  */
-                if (p && (!next || (p->prio < next->prio))) {
+                if (p && (p->prio < this_rq->rt.highest_prio.curr)) {
                         WARN_ON(p == src_rq->curr);
                         WARN_ON(!p->se.on_rq);
 
@@ -1217,12 +1419,9 @@ static int pull_rt_task(struct rq *this_rq)
                          * This is just that p is wakeing up and hasn't
                          * had a chance to schedule. We only pull
                          * p if it is lower in priority than the
-                         * current task on the run queue or
-                         * this_rq next task is lower in prio than
-                         * the current task on that rq.
+                         * current task on the run queue
                          */
-                        if (p->prio < src_rq->curr->prio ||
-                            (next && next->prio < src_rq->curr->prio))
+                        if (p->prio < src_rq->curr->prio)
                                 goto skip;
 
                         ret = 1;
@@ -1235,13 +1434,7 @@ static int pull_rt_task(struct rq *this_rq)
                          * case there's an even higher prio task
                          * in another runqueue. (low likelyhood
                          * but possible)
-                         *
-                         * Update next so that we won't pick a task
-                         * on another cpu with a priority lower (or equal)
-                         * than the one we just picked.
                          */
-                        next = p;
-
                 }
  skip:
                 double_unlock_balance(this_rq, src_rq);
@@ -1253,24 +1446,27 @@ static int pull_rt_task(struct rq *this_rq)
 static void pre_schedule_rt(struct rq *rq, struct task_struct *prev)
 {
         /* Try to pull RT tasks here if we lower this rq's prio */
-        if (unlikely(rt_task(prev)) && rq->rt.highest_prio > prev->prio)
+        if (unlikely(rt_task(prev)) && rq->rt.highest_prio.curr > prev->prio)
                 pull_rt_task(rq);
 }
 
+/*
+ * assumes rq->lock is held
+ */
+static int needs_post_schedule_rt(struct rq *rq)
+{
+        return has_pushable_tasks(rq);
+}
+
 static void post_schedule_rt(struct rq *rq)
 {
         /*
-         * If we have more than one rt_task queued, then
-         * see if we can push the other rt_tasks off to other CPUS.
-         * Note we may release the rq lock, and since
-         * the lock was owned by prev, we need to release it
-         * first via finish_lock_switch and then reaquire it here.
+         * This is only called if needs_post_schedule_rt() indicates that
+         * we need to push tasks away
          */
-        if (unlikely(rq->rt.overloaded)) {
-                spin_lock_irq(&rq->lock);
-                push_rt_tasks(rq);
-                spin_unlock_irq(&rq->lock);
-        }
+        spin_lock_irq(&rq->lock);
+        push_rt_tasks(rq);
+        spin_unlock_irq(&rq->lock);
 }
 
 /*
@@ -1281,7 +1477,8 @@ static void task_wake_up_rt(struct rq *rq, struct task_struct *p)
 {
         if (!task_running(rq, p) &&
             !test_tsk_need_resched(rq->curr) &&
-            rq->rt.overloaded)
+            has_pushable_tasks(rq) &&
+            p->rt.nr_cpus_allowed > 1)
                 push_rt_tasks(rq);
 }
 
@@ -1317,6 +1514,24 @@ static void set_cpus_allowed_rt(struct task_struct *p,
         if (p->se.on_rq && (weight != p->rt.nr_cpus_allowed)) {
                 struct rq *rq = task_rq(p);
 
+                if (!task_current(rq, p)) {
+                        /*
+                         * Make sure we dequeue this task from the pushable list
+                         * before going further.  It will either remain off of
+                         * the list because we are no longer pushable, or it
+                         * will be requeued.
+                         */
+                        if (p->rt.nr_cpus_allowed > 1)
+                                dequeue_pushable_task(rq, p);
+
+                        /*
+                         * Requeue if our weight is changing and still > 1
+                         */
+                        if (weight > 1)
+                                enqueue_pushable_task(rq, p);
+
+                }
+
                 if ((p->rt.nr_cpus_allowed <= 1) && (weight > 1)) {
                         rq->rt.rt_nr_migratory++;
                 } else if ((p->rt.nr_cpus_allowed > 1) && (weight <= 1)) {
@@ -1324,7 +1539,7 @@ static void set_cpus_allowed_rt(struct task_struct *p,
                         rq->rt.rt_nr_migratory--;
                 }
 
-                update_rt_migration(rq);
+                update_rt_migration(&rq->rt);
         }
 
         cpumask_copy(&p->cpus_allowed, new_mask);
@@ -1339,7 +1554,7 @@ static void rq_online_rt(struct rq *rq)
 
         __enable_runtime(rq);
 
-        cpupri_set(&rq->rd->cpupri, rq->cpu, rq->rt.highest_prio);
+        cpupri_set(&rq->rd->cpupri, rq->cpu, rq->rt.highest_prio.curr);
 }
 
 /* Assumes rq->lock is held */
@@ -1431,7 +1646,7 @@ static void prio_changed_rt(struct rq *rq, struct task_struct *p,
                  * can release the rq lock and p could migrate.
                  * Only reschedule if p is still on the same runqueue.
                  */
-                if (p->prio > rq->rt.highest_prio && rq->curr == p)
+                if (p->prio > rq->rt.highest_prio.curr && rq->curr == p)
                         resched_task(p);
 #else
                 /* For UP simply resched on drop of prio */
@@ -1502,6 +1717,9 @@ static void set_curr_task_rt(struct rq *rq)
         struct task_struct *p = rq->curr;
 
         p->se.exec_start = rq->clock;
+
+        /* The running task is never eligible for pushing */
+        dequeue_pushable_task(rq, p);
 }
 
 static const struct sched_class rt_sched_class = {
@@ -1524,6 +1742,7 @@ static const struct sched_class rt_sched_class = {
         .rq_online              = rq_online_rt,
         .rq_offline             = rq_offline_rt,
         .pre_schedule           = pre_schedule_rt,
+        .needs_post_schedule    = needs_post_schedule_rt,
         .post_schedule          = post_schedule_rt,
         .task_wake_up           = task_wake_up_rt,
         .switched_from          = switched_from_rt,
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index 8ab0cef8ecab..32d2bd4061b0 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -4,7 +4,7 @@
  * bump this up when changing the output format or the meaning of an existing
  * format, so that tools can adapt (or abort)
  */
-#define SCHEDSTAT_VERSION 14
+#define SCHEDSTAT_VERSION 15
 
 static int show_schedstat(struct seq_file *seq, void *v)
 {
@@ -26,9 +26,8 @@ static int show_schedstat(struct seq_file *seq, void *v)
 
                 /* runqueue-specific stats */
                 seq_printf(seq,
-                    "cpu%d %u %u %u %u %u %u %u %u %u %llu %llu %lu",
-                    cpu, rq->yld_both_empty,
-                    rq->yld_act_empty, rq->yld_exp_empty, rq->yld_count,
+                    "cpu%d %u %u %u %u %u %u %llu %llu %lu",
+                    cpu, rq->yld_count,
                     rq->sched_switch, rq->sched_count, rq->sched_goidle,
                     rq->ttwu_count, rq->ttwu_local,
                     rq->rq_cpu_time,
@@ -296,19 +295,21 @@ sched_info_switch(struct task_struct *prev, struct task_struct *next)
 static inline void account_group_user_time(struct task_struct *tsk,
                                            cputime_t cputime)
 {
-        struct task_cputime *times;
-        struct signal_struct *sig;
+        struct thread_group_cputimer *cputimer;
 
         /* tsk == current, ensure it is safe to use ->signal */
         if (unlikely(tsk->exit_state))
                 return;
 
-        sig = tsk->signal;
-        times = &sig->cputime.totals;
+        cputimer = &tsk->signal->cputimer;
 
-        spin_lock(&times->lock);
-        times->utime = cputime_add(times->utime, cputime);
-        spin_unlock(&times->lock);
+        if (!cputimer->running)
+                return;
+
+        spin_lock(&cputimer->lock);
+        cputimer->cputime.utime =
+                cputime_add(cputimer->cputime.utime, cputime);
+        spin_unlock(&cputimer->lock);
 }
 
 /**
@@ -324,19 +325,21 @@ static inline void account_group_user_time(struct task_struct *tsk,
 static inline void account_group_system_time(struct task_struct *tsk,
                                              cputime_t cputime)
 {
-        struct task_cputime *times;
-        struct signal_struct *sig;
+        struct thread_group_cputimer *cputimer;
 
         /* tsk == current, ensure it is safe to use ->signal */
         if (unlikely(tsk->exit_state))
                 return;
 
-        sig = tsk->signal;
-        times = &sig->cputime.totals;
+        cputimer = &tsk->signal->cputimer;
+
+        if (!cputimer->running)
+                return;
 
-        spin_lock(&times->lock);
-        times->stime = cputime_add(times->stime, cputime);
-        spin_unlock(&times->lock);
+        spin_lock(&cputimer->lock);
+        cputimer->cputime.stime =
+                cputime_add(cputimer->cputime.stime, cputime);
+        spin_unlock(&cputimer->lock);
 }
 
 /**
@@ -352,7 +355,7 @@ static inline void account_group_system_time(struct task_struct *tsk,
 static inline void account_group_exec_runtime(struct task_struct *tsk,
                                               unsigned long long ns)
 {
-        struct task_cputime *times;
+        struct thread_group_cputimer *cputimer;
         struct signal_struct *sig;
 
         sig = tsk->signal;
@@ -361,9 +364,12 @@ static inline void account_group_exec_runtime(struct task_struct *tsk,
         if (unlikely(!sig))
                 return;
 
-        times = &sig->cputime.totals;
+        cputimer = &sig->cputimer;
+
+        if (!cputimer->running)
+                return;
 
-        spin_lock(&times->lock);
-        times->sum_exec_runtime += ns;
-        spin_unlock(&times->lock);
+        spin_lock(&cputimer->lock);
+        cputimer->cputime.sum_exec_runtime += ns;
+        spin_unlock(&cputimer->lock);
 }
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index ad64fcb731f2..57d4b13b631d 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -8,6 +8,7 @@
 
 #include <linux/seccomp.h>
 #include <linux/sched.h>
+#include <linux/compat.h>
 
 /* #define SECCOMP_DEBUG 1 */
 #define NR_SECCOMP_MODES 1
@@ -22,7 +23,7 @@ static int mode1_syscalls[] = {
         0, /* null terminated */
 };
 
-#ifdef TIF_32BIT
+#ifdef CONFIG_COMPAT
 static int mode1_syscalls_32[] = {
         __NR_seccomp_read_32, __NR_seccomp_write_32, __NR_seccomp_exit_32, __NR_seccomp_sigreturn_32,
         0, /* null terminated */
@@ -37,8 +38,8 @@ void __secure_computing(int this_syscall)
         switch (mode) {
         case 1:
                 syscall = mode1_syscalls;
-#ifdef TIF_32BIT
-                if (test_thread_flag(TIF_32BIT))
+#ifdef CONFIG_COMPAT
+                if (is_compat_task())
                         syscall = mode1_syscalls_32;
 #endif
                 do {
diff --git a/kernel/signal.c b/kernel/signal.c
index b6b36768b758..d8034737db4c 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -55,10 +55,22 @@ static int sig_handler_ignored(void __user *handler, int sig)
                 (handler == SIG_DFL && sig_kernel_ignore(sig));
 }
 
-static int sig_ignored(struct task_struct *t, int sig)
+static int sig_task_ignored(struct task_struct *t, int sig,
+                int from_ancestor_ns)
 {
         void __user *handler;
 
+        handler = sig_handler(t, sig);
+
+        if (unlikely(t->signal->flags & SIGNAL_UNKILLABLE) &&
+                        handler == SIG_DFL && !from_ancestor_ns)
+                return 1;
+
+        return sig_handler_ignored(handler, sig);
+}
+
+static int sig_ignored(struct task_struct *t, int sig, int from_ancestor_ns)
+{
         /*
          * Blocked signals are never ignored, since the
          * signal handler may change by the time it is
@@ -67,14 +79,13 @@ static int sig_ignored(struct task_struct *t, int sig)
         if (sigismember(&t->blocked, sig) || sigismember(&t->real_blocked, sig))
                 return 0;
 
-        handler = sig_handler(t, sig);
-        if (!sig_handler_ignored(handler, sig))
+        if (!sig_task_ignored(t, sig, from_ancestor_ns))
                 return 0;
 
         /*
          * Tracers may want to know about even ignored signals.
          */
-        return !tracehook_consider_ignored_signal(t, sig, handler);
+        return !tracehook_consider_ignored_signal(t, sig);
 }
 
 /*
@@ -318,7 +329,7 @@ int unhandled_signal(struct task_struct *tsk, int sig)
                 return 1;
         if (handler != SIG_IGN && handler != SIG_DFL)
                 return 0;
-        return !tracehook_consider_fatal_signal(tsk, sig, handler);
+        return !tracehook_consider_fatal_signal(tsk, sig);
 }
 
 
@@ -624,7 +635,7 @@ static int check_kill_permission(int sig, struct siginfo *info,
  * Returns true if the signal should be actually delivered, otherwise
  * it should be dropped.
  */
-static int prepare_signal(int sig, struct task_struct *p)
+static int prepare_signal(int sig, struct task_struct *p, int from_ancestor_ns)
 {
         struct signal_struct *signal = p->signal;
         struct task_struct *t;
@@ -708,7 +719,7 @@ static int prepare_signal(int sig, struct task_struct *p)
                 }
         }
 
-        return !sig_ignored(p, sig);
+        return !sig_ignored(p, sig, from_ancestor_ns);
 }
 
 /*
@@ -777,7 +788,7 @@ static void complete_signal(int sig, struct task_struct *p, int group)
             !(signal->flags & (SIGNAL_UNKILLABLE | SIGNAL_GROUP_EXIT)) &&
             !sigismember(&t->real_blocked, sig) &&
             (sig == SIGKILL ||
-             !tracehook_consider_fatal_signal(t, sig, SIG_DFL))) {
+             !tracehook_consider_fatal_signal(t, sig))) {
                 /*
                  * This signal will be fatal to the whole group.
                  */
@@ -813,8 +824,8 @@ static inline int legacy_queue(struct sigpending *signals, int sig)
         return (sig < SIGRTMIN) && sigismember(&signals->signal, sig);
 }
 
-static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
-                        int group)
+static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
+                        int group, int from_ancestor_ns)
 {
         struct sigpending *pending;
         struct sigqueue *q;
@@ -822,7 +833,8 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
         trace_sched_signal_send(sig, t);
 
         assert_spin_locked(&t->sighand->siglock);
-        if (!prepare_signal(sig, t))
+
+        if (!prepare_signal(sig, t, from_ancestor_ns))
                 return 0;
 
         pending = group ? &t->signal->shared_pending : &t->pending;
@@ -871,6 +883,8 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
                         break;
                 default:
                         copy_siginfo(&q->info, info);
+                        if (from_ancestor_ns)
+                                q->info.si_pid = 0;
                         break;
                 }
         } else if (!is_si_special(info)) {
@@ -889,6 +903,20 @@ out_set:
         return 0;
 }
 
+static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
+                        int group)
+{
+        int from_ancestor_ns = 0;
+
+#ifdef CONFIG_PID_NS
+        if (!is_si_special(info) && SI_FROMUSER(info) &&
+                        task_pid_nr_ns(current, task_active_pid_ns(t)) <= 0)
+                from_ancestor_ns = 1;
+#endif
+
+        return __send_signal(sig, info, t, group, from_ancestor_ns);
+}
+
 int print_fatal_signals;
 
 static void print_fatal_signal(struct pt_regs *regs, int signr)
@@ -1133,7 +1161,7 @@ int kill_pid_info_as_uid(int sig, struct siginfo *info, struct pid *pid,
         if (sig && p->sighand) {
                 unsigned long flags;
                 spin_lock_irqsave(&p->sighand->siglock, flags);
-                ret = __group_send_sig_info(sig, info, p);
+                ret = __send_signal(sig, info, p, 1, 0);
                 spin_unlock_irqrestore(&p->sighand->siglock, flags);
         }
 out_unlock:
@@ -1320,7 +1348,7 @@ int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
                 goto ret;
 
         ret = 1; /* the signal is ignored */
-        if (!prepare_signal(sig, t))
+        if (!prepare_signal(sig, t, 0))
                 goto out;
 
         ret = 0;
@@ -1367,7 +1395,6 @@ int do_notify_parent(struct task_struct *tsk, int sig)
         struct siginfo info;
         unsigned long flags;
         struct sighand_struct *psig;
-        struct task_cputime cputime;
         int ret = sig;
 
         BUG_ON(sig == -1);
@@ -1397,9 +1424,10 @@ int do_notify_parent(struct task_struct *tsk, int sig)
         info.si_uid = __task_cred(tsk)->uid;
         rcu_read_unlock();
 
-        thread_group_cputime(tsk, &cputime);
-        info.si_utime = cputime_to_jiffies(cputime.utime);
-        info.si_stime = cputime_to_jiffies(cputime.stime);
+        info.si_utime = cputime_to_clock_t(cputime_add(tsk->utime,
+                                tsk->signal->utime));
+        info.si_stime = cputime_to_clock_t(cputime_add(tsk->stime,
+                                tsk->signal->stime));
 
         info.si_status = tsk->exit_code & 0x7f;
         if (tsk->exit_code & 0x80)
@@ -1575,7 +1603,15 @@ static void ptrace_stop(int exit_code, int clear_code, siginfo_t *info)
         read_lock(&tasklist_lock);
         if (may_ptrace_stop()) {
                 do_notify_parent_cldstop(current, CLD_TRAPPED);
+                /*
+                 * Don't want to allow preemption here, because
+                 * sys_ptrace() needs this task to be inactive.
+                 *
+                 * XXX: implement read_unlock_no_resched().
+                 */
+                preempt_disable();
                 read_unlock(&tasklist_lock);
+                preempt_enable_no_resched();
                 schedule();
         } else {
                 /*
@@ -1836,9 +1872,16 @@ relock:
 
                 /*
                  * Global init gets no signals it doesn't want.
+                 * Container-init gets no signals it doesn't want from same
+                 * container.
+                 *
+                 * Note that if global/container-init sees a sig_kernel_only()
+                 * signal here, the signal must have been generated internally
+                 * or must have come from an ancestor namespace. In either
+                 * case, the signal cannot be dropped.
                  */
                 if (unlikely(signal->flags & SIGNAL_UNKILLABLE) &&
-                    !signal_group_exit(signal))
+                                !sig_kernel_only(signr))
                         continue;
 
                 if (sig_kernel_stop(signr)) {
diff --git a/kernel/slow-work.c b/kernel/slow-work.c
new file mode 100644
index 000000000000..cf2bc01186ef
--- /dev/null
+++ b/kernel/slow-work.c
@@ -0,0 +1,640 @@
+/* Worker thread pool for slow items, such as filesystem lookups or mkdirs
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ *
+ * See Documentation/slow-work.txt
+ */
+
+#include <linux/module.h>
+#include <linux/slow-work.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/wait.h>
+
+#define SLOW_WORK_CULL_TIMEOUT (5 * HZ) /* cull threads 5s after running out of
+                                         * things to do */
+#define SLOW_WORK_OOM_TIMEOUT (5 * HZ)  /* can't start new threads for 5s after
+                                         * OOM */
+
+static void slow_work_cull_timeout(unsigned long);
+static void slow_work_oom_timeout(unsigned long);
+
+#ifdef CONFIG_SYSCTL
+static int slow_work_min_threads_sysctl(struct ctl_table *, int, struct file *,
+                                        void __user *, size_t *, loff_t *);
+
+static int slow_work_max_threads_sysctl(struct ctl_table *, int , struct file *,
+                                        void __user *, size_t *, loff_t *);
+#endif
+
+/*
+ * The pool of threads has at least min threads in it as long as someone is
+ * using the facility, and may have as many as max.
+ *
+ * A portion of the pool may be processing very slow operations.
+ */
+static unsigned slow_work_min_threads = 2;
+static unsigned slow_work_max_threads = 4;
+static unsigned vslow_work_proportion = 50; /* % of threads that may process
+                                             * very slow work */
+
+#ifdef CONFIG_SYSCTL
+static const int slow_work_min_min_threads = 2;
+static int slow_work_max_max_threads = 255;
+static const int slow_work_min_vslow = 1;
+static const int slow_work_max_vslow = 99;
+
+ctl_table slow_work_sysctls[] = {
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "min-threads",
+                .data           = &slow_work_min_threads,
+                .maxlen         = sizeof(unsigned),
+                .mode           = 0644,
+                .proc_handler   = slow_work_min_threads_sysctl,
+                .extra1         = (void *) &slow_work_min_min_threads,
+                .extra2         = &slow_work_max_threads,
+        },
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "max-threads",
+                .data           = &slow_work_max_threads,
+                .maxlen         = sizeof(unsigned),
+                .mode           = 0644,
+                .proc_handler   = slow_work_max_threads_sysctl,
+                .extra1         = &slow_work_min_threads,
+                .extra2         = (void *) &slow_work_max_max_threads,
+        },
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "vslow-percentage",
+                .data           = &vslow_work_proportion,
+                .maxlen         = sizeof(unsigned),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_minmax,
+                .extra1         = (void *) &slow_work_min_vslow,
+                .extra2         = (void *) &slow_work_max_vslow,
+        },
+        { .ctl_name = 0 }
+};
+#endif
+
+/*
+ * The active state of the thread pool
+ */
+static atomic_t slow_work_thread_count;
+static atomic_t vslow_work_executing_count;
+
+static bool slow_work_may_not_start_new_thread;
+static bool slow_work_cull; /* cull a thread due to lack of activity */
+static DEFINE_TIMER(slow_work_cull_timer, slow_work_cull_timeout, 0, 0);
+static DEFINE_TIMER(slow_work_oom_timer, slow_work_oom_timeout, 0, 0);
+static struct slow_work slow_work_new_thread; /* new thread starter */
+
+/*
+ * The queues of work items and the lock governing access to them.  These are
+ * shared between all the CPUs.  It doesn't make sense to have per-CPU queues
+ * as the number of threads bears no relation to the number of CPUs.
+ *
+ * There are two queues of work items: one for slow work items, and one for
+ * very slow work items.
+ */
+static LIST_HEAD(slow_work_queue);
+static LIST_HEAD(vslow_work_queue);
+static DEFINE_SPINLOCK(slow_work_queue_lock);
+
+/*
+ * The thread controls.  A variable used to signal to the threads that they
+ * should exit when the queue is empty, a waitqueue used by the threads to wait
+ * for signals, and a completion set by the last thread to exit.
+ */
+static bool slow_work_threads_should_exit;
+static DECLARE_WAIT_QUEUE_HEAD(slow_work_thread_wq);
+static DECLARE_COMPLETION(slow_work_last_thread_exited);
+
+/*
+ * The number of users of the thread pool and its lock.  Whilst this is zero we
+ * have no threads hanging around, and when this reaches zero, we wait for all
+ * active or queued work items to complete and kill all the threads we do have.
+ */
+static int slow_work_user_count;
+static DEFINE_MUTEX(slow_work_user_lock);
+
+/*
+ * Calculate the maximum number of active threads in the pool that are
+ * permitted to process very slow work items.
+ *
+ * The answer is rounded up to at least 1, but may not equal or exceed the
+ * maximum number of the threads in the pool.  This means we always have at
+ * least one thread that can process slow work items, and we always have at
+ * least one thread that won't get tied up doing so.
+ */
+static unsigned slow_work_calc_vsmax(void)
+{
+        unsigned vsmax;
+
+        vsmax = atomic_read(&slow_work_thread_count) * vslow_work_proportion;
+        vsmax /= 100;
+        vsmax = max(vsmax, 1U);
+        return min(vsmax, slow_work_max_threads - 1);
+}
+
+/*
+ * Attempt to execute stuff queued on a slow thread.  Return true if we managed
+ * it, false if there was nothing to do.
+ */
+static bool slow_work_execute(void)
+{
+        struct slow_work *work = NULL;
+        unsigned vsmax;
+        bool very_slow;
+
+        vsmax = slow_work_calc_vsmax();
+
+        /* see if we can schedule a new thread to be started if we're not
+         * keeping up with the work */
+        if (!waitqueue_active(&slow_work_thread_wq) &&
+            (!list_empty(&slow_work_queue) || !list_empty(&vslow_work_queue)) &&
+            atomic_read(&slow_work_thread_count) < slow_work_max_threads &&
+            !slow_work_may_not_start_new_thread)
+                slow_work_enqueue(&slow_work_new_thread);
+
+        /* find something to execute */
+        spin_lock_irq(&slow_work_queue_lock);
+        if (!list_empty(&vslow_work_queue) &&
+            atomic_read(&vslow_work_executing_count) < vsmax) {
+                work = list_entry(vslow_work_queue.next,
+                                  struct slow_work, link);
+                if (test_and_set_bit_lock(SLOW_WORK_EXECUTING, &work->flags))
+                        BUG();
+                list_del_init(&work->link);
+                atomic_inc(&vslow_work_executing_count);
+                very_slow = true;
+        } else if (!list_empty(&slow_work_queue)) {
+                work = list_entry(slow_work_queue.next,
+                                  struct slow_work, link);
+                if (test_and_set_bit_lock(SLOW_WORK_EXECUTING, &work->flags))
+                        BUG();
+                list_del_init(&work->link);
+                very_slow = false;
+        } else {
+                very_slow = false; /* avoid the compiler warning */
+        }
+        spin_unlock_irq(&slow_work_queue_lock);
+
+        if (!work)
+                return false;
+
+        if (!test_and_clear_bit(SLOW_WORK_PENDING, &work->flags))
+                BUG();
+
+        work->ops->execute(work);
+
+        if (very_slow)
+                atomic_dec(&vslow_work_executing_count);
+        clear_bit_unlock(SLOW_WORK_EXECUTING, &work->flags);
+
+        /* if someone tried to enqueue the item whilst we were executing it,
+         * then it'll be left unenqueued to avoid multiple threads trying to
+         * execute it simultaneously
+         *
+         * there is, however, a race between us testing the pending flag and
+         * getting the spinlock, and between the enqueuer setting the pending
+         * flag and getting the spinlock, so we use a deferral bit to tell us
+         * if the enqueuer got there first
+         */
+        if (test_bit(SLOW_WORK_PENDING, &work->flags)) {
+                spin_lock_irq(&slow_work_queue_lock);
+
+                if (!test_bit(SLOW_WORK_EXECUTING, &work->flags) &&
+                    test_and_clear_bit(SLOW_WORK_ENQ_DEFERRED, &work->flags))
+                        goto auto_requeue;
+
+                spin_unlock_irq(&slow_work_queue_lock);
+        }
+
+        work->ops->put_ref(work);
+        return true;
+
+auto_requeue:
+        /* we must complete the enqueue operation
+         * - we transfer our ref on the item back to the appropriate queue
+         * - don't wake another thread up as we're awake already
+         */
+        if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags))
+                list_add_tail(&work->link, &vslow_work_queue);
+        else
+                list_add_tail(&work->link, &slow_work_queue);
+        spin_unlock_irq(&slow_work_queue_lock);
+        return true;
+}
+
+/**
+ * slow_work_enqueue - Schedule a slow work item for processing
+ * @work: The work item to queue
+ *
+ * Schedule a slow work item for processing.  If the item is already undergoing
+ * execution, this guarantees not to re-enter the execution routine until the
+ * first execution finishes.
+ *
+ * The item is pinned by this function as it retains a reference to it, managed
+ * through the item operations.  The item is unpinned once it has been
+ * executed.
+ *
+ * An item may hog the thread that is running it for a relatively large amount
+ * of time, sufficient, for example, to perform several lookup, mkdir, create
+ * and setxattr operations.  It may sleep on I/O and may sleep to obtain locks.
+ *
+ * Conversely, if a number of items are awaiting processing, it may take some
+ * time before any given item is given attention.  The number of threads in the
+ * pool may be increased to deal with demand, but only up to a limit.
+ *
+ * If SLOW_WORK_VERY_SLOW is set on the work item, then it will be placed in
+ * the very slow queue, from which only a portion of the threads will be
+ * allowed to pick items to execute.  This ensures that very slow items won't
+ * overly block ones that are just ordinarily slow.
+ *
+ * Returns 0 if successful, -EAGAIN if not.
+ */
+int slow_work_enqueue(struct slow_work *work)
+{
+        unsigned long flags;
+
+        BUG_ON(slow_work_user_count <= 0);
+        BUG_ON(!work);
+        BUG_ON(!work->ops);
+        BUG_ON(!work->ops->get_ref);
+
+        /* when honouring an enqueue request, we only promise that we will run
+         * the work function in the future; we do not promise to run it once
+         * per enqueue request
+         *
+         * we use the PENDING bit to merge together repeat requests without
+         * having to disable IRQs and take the spinlock, whilst still
+         * maintaining our promise
+         */
+        if (!test_and_set_bit_lock(SLOW_WORK_PENDING, &work->flags)) {
+                spin_lock_irqsave(&slow_work_queue_lock, flags);
+
+                /* we promise that we will not attempt to execute the work
+                 * function in more than one thread simultaneously
+                 *
+                 * this, however, leaves us with a problem if we're asked to
+                 * enqueue the work whilst someone is executing the work
+                 * function as simply queueing the work immediately means that
+                 * another thread may try executing it whilst it is already
+                 * under execution
+                 *
+                 * to deal with this, we set the ENQ_DEFERRED bit instead of
+                 * enqueueing, and the thread currently executing the work
+                 * function will enqueue the work item when the work function
+                 * returns and it has cleared the EXECUTING bit
+                 */
+                if (test_bit(SLOW_WORK_EXECUTING, &work->flags)) {
+                        set_bit(SLOW_WORK_ENQ_DEFERRED, &work->flags);
+                } else {
+                        if (work->ops->get_ref(work) < 0)
+                                goto cant_get_ref;
+                        if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags))
+                                list_add_tail(&work->link, &vslow_work_queue);
+                        else
+                                list_add_tail(&work->link, &slow_work_queue);
+                        wake_up(&slow_work_thread_wq);
+                }
+
+                spin_unlock_irqrestore(&slow_work_queue_lock, flags);
+        }
+        return 0;
+
+cant_get_ref:
+        spin_unlock_irqrestore(&slow_work_queue_lock, flags);
+        return -EAGAIN;
+}
+EXPORT_SYMBOL(slow_work_enqueue);
+
+/*
+ * Worker thread culling algorithm
+ */
+static bool slow_work_cull_thread(void)
+{
+        unsigned long flags;
+        bool do_cull = false;
+
+        spin_lock_irqsave(&slow_work_queue_lock, flags);
+
+        if (slow_work_cull) {
+                slow_work_cull = false;
+
+                if (list_empty(&slow_work_queue) &&
+                    list_empty(&vslow_work_queue) &&
+                    atomic_read(&slow_work_thread_count) >
+                    slow_work_min_threads) {
+                        mod_timer(&slow_work_cull_timer,
+                                  jiffies + SLOW_WORK_CULL_TIMEOUT);
+                        do_cull = true;
+                }
+        }
+
+        spin_unlock_irqrestore(&slow_work_queue_lock, flags);
+        return do_cull;
+}
+
+/*
+ * Determine if there is slow work available for dispatch
+ */
+static inline bool slow_work_available(int vsmax)
+{
+        return !list_empty(&slow_work_queue) ||
+                (!list_empty(&vslow_work_queue) &&
+                 atomic_read(&vslow_work_executing_count) < vsmax);
+}
+
+/*
+ * Worker thread dispatcher
+ */
+static int slow_work_thread(void *_data)
+{
+        int vsmax;
+
+        DEFINE_WAIT(wait);
+
+        set_freezable();
+        set_user_nice(current, -5);
+
+        for (;;) {
+                vsmax = vslow_work_proportion;
+                vsmax *= atomic_read(&slow_work_thread_count);
+                vsmax /= 100;
+
+                prepare_to_wait(&slow_work_thread_wq, &wait,
+                                TASK_INTERRUPTIBLE);
+                if (!freezing(current) &&
+                    !slow_work_threads_should_exit &&
+                    !slow_work_available(vsmax) &&
+                    !slow_work_cull)
+                        schedule();
+                finish_wait(&slow_work_thread_wq, &wait);
+
+                try_to_freeze();
+
+                vsmax = vslow_work_proportion;
+                vsmax *= atomic_read(&slow_work_thread_count);
+                vsmax /= 100;
+
+                if (slow_work_available(vsmax) && slow_work_execute()) {
+                        cond_resched();
+                        if (list_empty(&slow_work_queue) &&
+                            list_empty(&vslow_work_queue) &&
+                            atomic_read(&slow_work_thread_count) >
+                            slow_work_min_threads)
+                                mod_timer(&slow_work_cull_timer,
+                                          jiffies + SLOW_WORK_CULL_TIMEOUT);
+                        continue;
+                }
+
+                if (slow_work_threads_should_exit)
+                        break;
+
+                if (slow_work_cull && slow_work_cull_thread())
+                        break;
+        }
+
+        if (atomic_dec_and_test(&slow_work_thread_count))
+                complete_and_exit(&slow_work_last_thread_exited, 0);
+        return 0;
+}
+
+/*
+ * Handle thread cull timer expiration
+ */
+static void slow_work_cull_timeout(unsigned long data)
+{
+        slow_work_cull = true;
+        wake_up(&slow_work_thread_wq);
+}
+
+/*
+ * Get a reference on slow work thread starter
+ */
+static int slow_work_new_thread_get_ref(struct slow_work *work)
+{
+        return 0;
+}
+
+/*
+ * Drop a reference on slow work thread starter
+ */
+static void slow_work_new_thread_put_ref(struct slow_work *work)
+{
+}
+
+/*
+ * Start a new slow work thread
+ */
+static void slow_work_new_thread_execute(struct slow_work *work)
+{
+        struct task_struct *p;
+
+        if (slow_work_threads_should_exit)
+                return;
+
+        if (atomic_read(&slow_work_thread_count) >= slow_work_max_threads)
+                return;
+
+        if (!mutex_trylock(&slow_work_user_lock))
+                return;
+
+        slow_work_may_not_start_new_thread = true;
+        atomic_inc(&slow_work_thread_count);
+        p = kthread_run(slow_work_thread, NULL, "kslowd");
+        if (IS_ERR(p)) {
+                printk(KERN_DEBUG "Slow work thread pool: OOM\n");
+                if (atomic_dec_and_test(&slow_work_thread_count))
+                        BUG(); /* we're running on a slow work thread... */
+                mod_timer(&slow_work_oom_timer,
+                          jiffies + SLOW_WORK_OOM_TIMEOUT);
+        } else {
+                /* ratelimit the starting of new threads */
+                mod_timer(&slow_work_oom_timer, jiffies + 1);
+        }
+
+        mutex_unlock(&slow_work_user_lock);
+}
+
+static const struct slow_work_ops slow_work_new_thread_ops = {
+        .get_ref        = slow_work_new_thread_get_ref,
+        .put_ref        = slow_work_new_thread_put_ref,
+        .execute        = slow_work_new_thread_execute,
+};
+
+/*
+ * post-OOM new thread start suppression expiration
+ */
+static void slow_work_oom_timeout(unsigned long data)
+{
+        slow_work_may_not_start_new_thread = false;
+}
+
+#ifdef CONFIG_SYSCTL
+/*
+ * Handle adjustment of the minimum number of threads
+ */
+static int slow_work_min_threads_sysctl(struct ctl_table *table, int write,
+                                        struct file *filp, void __user *buffer,
+                                        size_t *lenp, loff_t *ppos)
+{
+        int ret = proc_dointvec_minmax(table, write, filp, buffer, lenp, ppos);
+        int n;
+
+        if (ret == 0) {
+                mutex_lock(&slow_work_user_lock);
+                if (slow_work_user_count > 0) {
+                        /* see if we need to start or stop threads */
+                        n = atomic_read(&slow_work_thread_count) -
+                                slow_work_min_threads;
+
+                        if (n < 0 && !slow_work_may_not_start_new_thread)
+                                slow_work_enqueue(&slow_work_new_thread);
+                        else if (n > 0)
+                                mod_timer(&slow_work_cull_timer,
+                                          jiffies + SLOW_WORK_CULL_TIMEOUT);
+                }
+                mutex_unlock(&slow_work_user_lock);
+        }
+
+        return ret;
+}
+
+/*
+ * Handle adjustment of the maximum number of threads
+ */
+static int slow_work_max_threads_sysctl(struct ctl_table *table, int write,
+                                        struct file *filp, void __user *buffer,
+                                        size_t *lenp, loff_t *ppos)
+{
+        int ret = proc_dointvec_minmax(table, write, filp, buffer, lenp, ppos);
+        int n;
+
+        if (ret == 0) {
+                mutex_lock(&slow_work_user_lock);
+                if (slow_work_user_count > 0) {
+                        /* see if we need to stop threads */
+                        n = slow_work_max_threads -
+                                atomic_read(&slow_work_thread_count);
+
+                        if (n < 0)
+                                mod_timer(&slow_work_cull_timer,
+                                          jiffies + SLOW_WORK_CULL_TIMEOUT);
+                }
+                mutex_unlock(&slow_work_user_lock);
+        }
+
+        return ret;
+}
+#endif /* CONFIG_SYSCTL */
+
+/**
+ * slow_work_register_user - Register a user of the facility
+ *
+ * Register a user of the facility, starting up the initial threads if there
+ * aren't any other users at this point.  This will return 0 if successful, or
+ * an error if not.
+ */
+int slow_work_register_user(void)
+{
+        struct task_struct *p;
+        int loop;
+
+        mutex_lock(&slow_work_user_lock);
+
+        if (slow_work_user_count == 0) {
+                printk(KERN_NOTICE "Slow work thread pool: Starting up\n");
+                init_completion(&slow_work_last_thread_exited);
+
+                slow_work_threads_should_exit = false;
+                slow_work_init(&slow_work_new_thread,
+                               &slow_work_new_thread_ops);
+                slow_work_may_not_start_new_thread = false;
+                slow_work_cull = false;
+
+                /* start the minimum number of threads */
+                for (loop = 0; loop < slow_work_min_threads; loop++) {
+                        atomic_inc(&slow_work_thread_count);
+                        p = kthread_run(slow_work_thread, NULL, "kslowd");
+                        if (IS_ERR(p))
+                                goto error;
+                }
+                printk(KERN_NOTICE "Slow work thread pool: Ready\n");
+        }
+
+        slow_work_user_count++;
+        mutex_unlock(&slow_work_user_lock);
+        return 0;
+
+error:
+        if (atomic_dec_and_test(&slow_work_thread_count))
+                complete(&slow_work_last_thread_exited);
+        if (loop > 0) {
+                printk(KERN_ERR "Slow work thread pool:"
+                       " Aborting startup on ENOMEM\n");
+                slow_work_threads_should_exit = true;
+                wake_up_all(&slow_work_thread_wq);
+                wait_for_completion(&slow_work_last_thread_exited);
+                printk(KERN_ERR "Slow work thread pool: Aborted\n");
+        }
+        mutex_unlock(&slow_work_user_lock);
+        return PTR_ERR(p);
+}
+EXPORT_SYMBOL(slow_work_register_user);
+
+/**
+ * slow_work_unregister_user - Unregister a user of the facility
+ *
+ * Unregister a user of the facility, killing all the threads if this was the
+ * last one.
+ */
+void slow_work_unregister_user(void)
+{
+        mutex_lock(&slow_work_user_lock);
+
+        BUG_ON(slow_work_user_count <= 0);
+
+        slow_work_user_count--;
+        if (slow_work_user_count == 0) {
+                printk(KERN_NOTICE "Slow work thread pool: Shutting down\n");
+                slow_work_threads_should_exit = true;
+                wake_up_all(&slow_work_thread_wq);
+                wait_for_completion(&slow_work_last_thread_exited);
+                printk(KERN_NOTICE "Slow work thread pool:"
+                       " Shut down complete\n");
+        }
+
+        del_timer_sync(&slow_work_cull_timer);
+
+        mutex_unlock(&slow_work_user_lock);
+}
+EXPORT_SYMBOL(slow_work_unregister_user);
+
+/*
+ * Initialise the slow work facility
+ */
+static int __init init_slow_work(void)
+{
+        unsigned nr_cpus = num_possible_cpus();
+
+        if (slow_work_max_threads < nr_cpus)
+                slow_work_max_threads = nr_cpus;
+#ifdef CONFIG_SYSCTL
+        if (slow_work_max_max_threads < nr_cpus * 2)
+                slow_work_max_max_threads = nr_cpus * 2;
+#endif
+        return 0;
+}
+
+subsys_initcall(init_slow_work);
diff --git a/kernel/smp.c b/kernel/smp.c
index bbedbb7efe32..858baac568ee 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -2,40 +2,82 @@
  * Generic helpers for smp ipi calls
  *
  * (C) Jens Axboe <jens.axboe@oracle.com> 2008
- *
  */
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/percpu.h>
 #include <linux/rcupdate.h>
 #include <linux/rculist.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/percpu.h>
+#include <linux/init.h>
 #include <linux/smp.h>
+#include <linux/cpu.h>
 
 static DEFINE_PER_CPU(struct call_single_queue, call_single_queue);
-static LIST_HEAD(call_function_queue);
-__cacheline_aligned_in_smp DEFINE_SPINLOCK(call_function_lock);
+
+static struct {
+        struct list_head        queue;
+        spinlock_t              lock;
+} call_function __cacheline_aligned_in_smp =
+        {
+                .queue          = LIST_HEAD_INIT(call_function.queue),
+                .lock           = __SPIN_LOCK_UNLOCKED(call_function.lock),
+        };
 
 enum {
-        CSD_FLAG_WAIT           = 0x01,
-        CSD_FLAG_ALLOC          = 0x02,
-        CSD_FLAG_LOCK           = 0x04,
+        CSD_FLAG_LOCK           = 0x01,
 };
 
 struct call_function_data {
-        struct call_single_data csd;
-        spinlock_t lock;
-        unsigned int refs;
-        struct rcu_head rcu_head;
-        unsigned long cpumask_bits[];
+        struct call_single_data csd;
+        spinlock_t              lock;
+        unsigned int            refs;
+        cpumask_var_t           cpumask;
 };
 
 struct call_single_queue {
-        struct list_head list;
-        spinlock_t lock;
+        struct list_head        list;
+        spinlock_t              lock;
+};
+
+static DEFINE_PER_CPU(struct call_function_data, cfd_data) = {
+        .lock                   = __SPIN_LOCK_UNLOCKED(cfd_data.lock),
+};
+
+static int
+hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
+{
+        long cpu = (long)hcpu;
+        struct call_function_data *cfd = &per_cpu(cfd_data, cpu);
+
+        switch (action) {
+        case CPU_UP_PREPARE:
+        case CPU_UP_PREPARE_FROZEN:
+                if (!alloc_cpumask_var_node(&cfd->cpumask, GFP_KERNEL,
+                                cpu_to_node(cpu)))
+                        return NOTIFY_BAD;
+                break;
+
+#ifdef CONFIG_CPU_HOTPLUG
+        case CPU_UP_CANCELED:
+        case CPU_UP_CANCELED_FROZEN:
+
+        case CPU_DEAD:
+        case CPU_DEAD_FROZEN:
+                free_cpumask_var(cfd->cpumask);
+                break;
+#endif
+        };
+
+        return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata hotplug_cfd_notifier = {
+        .notifier_call          = hotplug_cfd,
 };
 
 static int __cpuinit init_call_single_data(void)
 {
+        void *cpu = (void *)(long)smp_processor_id();
         int i;
 
         for_each_possible_cpu(i) {
@@ -44,29 +86,63 @@ static int __cpuinit init_call_single_data(void)
                 spin_lock_init(&q->lock);
                 INIT_LIST_HEAD(&q->list);
         }
+
+        hotplug_cfd(&hotplug_cfd_notifier, CPU_UP_PREPARE, cpu);
+        register_cpu_notifier(&hotplug_cfd_notifier);
+
         return 0;
 }
 early_initcall(init_call_single_data);
 
-static void csd_flag_wait(struct call_single_data *data)
+/*
+ * csd_lock/csd_unlock used to serialize access to per-cpu csd resources
+ *
+ * For non-synchronous ipi calls the csd can still be in use by the
+ * previous function call. For multi-cpu calls its even more interesting
+ * as we'll have to ensure no other cpu is observing our csd.
+ */
+static void csd_lock_wait(struct call_single_data *data)
 {
-        /* Wait for response */
-        do {
-                if (!(data->flags & CSD_FLAG_WAIT))
-                        break;
+        while (data->flags & CSD_FLAG_LOCK)
                 cpu_relax();
-        } while (1);
+}
+
+static void csd_lock(struct call_single_data *data)
+{
+        csd_lock_wait(data);
+        data->flags = CSD_FLAG_LOCK;
+
+        /*
+         * prevent CPU from reordering the above assignment
+         * to ->flags with any subsequent assignments to other
+         * fields of the specified call_single_data structure:
+         */
+        smp_mb();
+}
+
+static void csd_unlock(struct call_single_data *data)
+{
+        WARN_ON(!(data->flags & CSD_FLAG_LOCK));
+
+        /*
+         * ensure we're all done before releasing data:
+         */
+        smp_mb();
+
+        data->flags &= ~CSD_FLAG_LOCK;
 }
 
 /*
- * Insert a previously allocated call_single_data element for execution
- * on the given CPU. data must already have ->func, ->info, and ->flags set.
+ * Insert a previously allocated call_single_data element
+ * for execution on the given CPU. data must already have
+ * ->func, ->info, and ->flags set.
  */
-static void generic_exec_single(int cpu, struct call_single_data *data)
+static
+void generic_exec_single(int cpu, struct call_single_data *data, int wait)
 {
         struct call_single_queue *dst = &per_cpu(call_single_queue, cpu);
-        int wait = data->flags & CSD_FLAG_WAIT, ipi;
         unsigned long flags;
+        int ipi;
 
         spin_lock_irqsave(&dst->lock, flags);
         ipi = list_empty(&dst->list);
@@ -74,24 +150,21 @@ static void generic_exec_single(int cpu, struct call_single_data *data)
         spin_unlock_irqrestore(&dst->lock, flags);
 
         /*
-         * Make the list addition visible before sending the ipi.
+         * The list addition should be visible before sending the IPI
+         * handler locks the list to pull the entry off it because of
+         * normal cache coherency rules implied by spinlocks.
+         *
+         * If IPIs can go out of order to the cache coherency protocol
+         * in an architecture, sufficient synchronisation should be added
+         * to arch code to make it appear to obey cache coherency WRT
+         * locking and barrier primitives. Generic code isn't really
+         * equipped to do the right thing...
          */
-        smp_mb();
-
         if (ipi)
                 arch_send_call_function_single_ipi(cpu);
 
         if (wait)
-                csd_flag_wait(data);
-}
-
-static void rcu_free_call_data(struct rcu_head *head)
-{
-        struct call_function_data *data;
-
-        data = container_of(head, struct call_function_data, rcu_head);
-
-        kfree(data);
+                csd_lock_wait(data);
 }
 
 /*
@@ -104,99 +177,83 @@ void generic_smp_call_function_interrupt(void)
         int cpu = get_cpu();
 
         /*
-         * It's ok to use list_for_each_rcu() here even though we may delete
-         * 'pos', since list_del_rcu() doesn't clear ->next
+         * Ensure entry is visible on call_function_queue after we have
+         * entered the IPI. See comment in smp_call_function_many.
+         * If we don't have this, then we may miss an entry on the list
+         * and never get another IPI to process it.
+         */
+        smp_mb();
+
+        /*
+         * It's ok to use list_for_each_rcu() here even though we may
+         * delete 'pos', since list_del_rcu() doesn't clear ->next
          */
-        rcu_read_lock();
-        list_for_each_entry_rcu(data, &call_function_queue, csd.list) {
+        list_for_each_entry_rcu(data, &call_function.queue, csd.list) {
                 int refs;
 
-                if (!cpumask_test_cpu(cpu, to_cpumask(data->cpumask_bits)))
+                spin_lock(&data->lock);
+                if (!cpumask_test_cpu(cpu, data->cpumask)) {
+                        spin_unlock(&data->lock);
                         continue;
+                }
+                cpumask_clear_cpu(cpu, data->cpumask);
+                spin_unlock(&data->lock);
 
                 data->csd.func(data->csd.info);
 
                 spin_lock(&data->lock);
-                cpumask_clear_cpu(cpu, to_cpumask(data->cpumask_bits));
                 WARN_ON(data->refs == 0);
-                data->refs--;
-                refs = data->refs;
+                refs = --data->refs;
+                if (!refs) {
+                        spin_lock(&call_function.lock);
+                        list_del_rcu(&data->csd.list);
+                        spin_unlock(&call_function.lock);
+                }
                 spin_unlock(&data->lock);
 
                 if (refs)
                         continue;
 
-                spin_lock(&call_function_lock);
-                list_del_rcu(&data->csd.list);
-                spin_unlock(&call_function_lock);
-
-                if (data->csd.flags & CSD_FLAG_WAIT) {
-                        /*
-                         * serialize stores to data with the flag clear
-                         * and wakeup
-                         */
-                        smp_wmb();
-                        data->csd.flags &= ~CSD_FLAG_WAIT;
-                }
-                if (data->csd.flags & CSD_FLAG_ALLOC)
-                        call_rcu(&data->rcu_head, rcu_free_call_data);
+                csd_unlock(&data->csd);
         }
-        rcu_read_unlock();
 
         put_cpu();
 }
 
 /*
- * Invoked by arch to handle an IPI for call function single. Must be called
- * from the arch with interrupts disabled.
+ * Invoked by arch to handle an IPI for call function single. Must be
+ * called from the arch with interrupts disabled.
  */
 void generic_smp_call_function_single_interrupt(void)
 {
         struct call_single_queue *q = &__get_cpu_var(call_single_queue);
+        unsigned int data_flags;
         LIST_HEAD(list);
 
-        /*
-         * Need to see other stores to list head for checking whether
-         * list is empty without holding q->lock
-         */
-        smp_read_barrier_depends();
-        while (!list_empty(&q->list)) {
-                unsigned int data_flags;
-
-                spin_lock(&q->lock);
-                list_replace_init(&q->list, &list);
-                spin_unlock(&q->lock);
-
-                while (!list_empty(&list)) {
-                        struct call_single_data *data;
-
-                        data = list_entry(list.next, struct call_single_data,
-                                                list);
-                        list_del(&data->list);
-
-                        /*
-                         * 'data' can be invalid after this call if
-                         * flags == 0 (when called through
-                         * generic_exec_single(), so save them away before
-                         * making the call.
-                         */
-                        data_flags = data->flags;
-
-                        data->func(data->info);
-
-                        if (data_flags & CSD_FLAG_WAIT) {
-                                smp_wmb();
-                                data->flags &= ~CSD_FLAG_WAIT;
-                        } else if (data_flags & CSD_FLAG_LOCK) {
-                                smp_wmb();
-                                data->flags &= ~CSD_FLAG_LOCK;
-                        } else if (data_flags & CSD_FLAG_ALLOC)
-                                kfree(data);
-                }
+        spin_lock(&q->lock);
+        list_replace_init(&q->list, &list);
+        spin_unlock(&q->lock);
+
+        while (!list_empty(&list)) {
+                struct call_single_data *data;
+
+                data = list_entry(list.next, struct call_single_data, list);
+                list_del(&data->list);
+
+                /*
+                 * 'data' can be invalid after this call if flags == 0
+                 * (when called through generic_exec_single()),
+                 * so save them away before making the call:
+                 */
+                data_flags = data->flags;
+
+                data->func(data->info);
+
                 /*
-                 * See comment on outer loop
+                 * Unlocked CSDs are valid through generic_exec_single():
                  */
-                smp_read_barrier_depends();
+                if (data_flags & CSD_FLAG_LOCK)
+                        csd_unlock(data);
         }
 }
 
@@ -215,65 +272,45 @@ static DEFINE_PER_CPU(struct call_single_data, csd_data);
 int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
                              int wait)
 {
-        struct call_single_data d;
+        struct call_single_data d = {
+                .flags = 0,
+        };
         unsigned long flags;
-        /* prevent preemption and reschedule on another processor,
-           as well as CPU removal */
-        int me = get_cpu();
+        int this_cpu;
         int err = 0;
 
+        /*
+         * prevent preemption and reschedule on another processor,
+         * as well as CPU removal
+         */
+        this_cpu = get_cpu();
+
         /* Can deadlock when called with interrupts disabled */
-        WARN_ON(irqs_disabled());
+        WARN_ON_ONCE(irqs_disabled() && !oops_in_progress);
 
-        if (cpu == me) {
+        if (cpu == this_cpu) {
                 local_irq_save(flags);
                 func(info);
                 local_irq_restore(flags);
-        } else if ((unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) {
-                struct call_single_data *data;
+        } else {
+                if ((unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) {
+                        struct call_single_data *data = &d;
+
+                        if (!wait)
+                                data = &__get_cpu_var(csd_data);
 
-                if (!wait) {
-                        /*
-                         * We are calling a function on a single CPU
-                         * and we are not going to wait for it to finish.
-                         * We first try to allocate the data, but if we
-                         * fail, we fall back to use a per cpu data to pass
-                         * the information to that CPU. Since all callers
-                         * of this code will use the same data, we must
-                         * synchronize the callers to prevent a new caller
-                         * from corrupting the data before the callee
-                         * can access it.
-                         *
-                         * The CSD_FLAG_LOCK is used to let us know when
-                         * the IPI handler is done with the data.
-                         * The first caller will set it, and the callee
-                         * will clear it. The next caller must wait for
-                         * it to clear before we set it again. This
-                         * will make sure the callee is done with the
-                         * data before a new caller will use it.
-                         */
-                        data = kmalloc(sizeof(*data), GFP_ATOMIC);
-                        if (data)
-                                data->flags = CSD_FLAG_ALLOC;
-                        else {
-                                data = &per_cpu(csd_data, me);
-                                while (data->flags & CSD_FLAG_LOCK)
-                                        cpu_relax();
-                                data->flags = CSD_FLAG_LOCK;
-                        }
+                        csd_lock(data);
+
+                        data->func = func;
+                        data->info = info;
+                        generic_exec_single(cpu, data, wait);
                 } else {
-                        data = &d;
-                        data->flags = CSD_FLAG_WAIT;
+                        err = -ENXIO;   /* CPU not online */
                 }
-
-                data->func = func;
-                data->info = info;
-                generic_exec_single(cpu, data);
-        } else {
-                err = -ENXIO;   /* CPU not online */
         }
 
         put_cpu();
+
         return err;
 }
 EXPORT_SYMBOL(smp_call_function_single);
@@ -283,23 +320,26 @@ EXPORT_SYMBOL(smp_call_function_single);
  * @cpu: The CPU to run on.
  * @data: Pre-allocated and setup data structure
  *
- * Like smp_call_function_single(), but allow caller to pass in a pre-allocated
- * data structure. Useful for embedding @data inside other structures, for
- * instance.
- *
+ * Like smp_call_function_single(), but allow caller to pass in a
+ * pre-allocated data structure. Useful for embedding @data inside
+ * other structures, for instance.
  */
-void __smp_call_function_single(int cpu, struct call_single_data *data)
+void __smp_call_function_single(int cpu, struct call_single_data *data,
+                                int wait)
 {
+        csd_lock(data);
+
         /* Can deadlock when called with interrupts disabled */
-        WARN_ON((data->flags & CSD_FLAG_WAIT) && irqs_disabled());
+        WARN_ON_ONCE(wait && irqs_disabled() && !oops_in_progress);
 
-        generic_exec_single(cpu, data);
+        generic_exec_single(cpu, data, wait);
 }
 
-/* FIXME: Shim for archs using old arch_send_call_function_ipi API. */
+/* Deprecated: shim for archs using old arch_send_call_function_ipi API. */
+
 #ifndef arch_send_call_function_ipi_mask
-#define arch_send_call_function_ipi_mask(maskp) \
-        arch_send_call_function_ipi(*(maskp))
+# define arch_send_call_function_ipi_mask(maskp) \
+         arch_send_call_function_ipi(*(maskp))
 #endif
 
 /**
@@ -307,7 +347,8 @@ void __smp_call_function_single(int cpu, struct call_single_data *data)
  * @mask: The set of cpus to run on (only runs on online subset).
  * @func: The function to run. This must be fast and non-blocking.
  * @info: An arbitrary pointer to pass to the function.
- * @wait: If true, wait (atomically) until function has completed on other CPUs.
+ * @wait: If true, wait (atomically) until function has completed
+ *        on other CPUs.
  *
  * If @wait is true, then returns once @func has returned. Note that @wait
  * will be implicitly turned on in case of allocation failures, since
@@ -318,27 +359,27 @@ void __smp_call_function_single(int cpu, struct call_single_data *data)
  * must be disabled when calling this function.
  */
 void smp_call_function_many(const struct cpumask *mask,
-                            void (*func)(void *), void *info,
-                            bool wait)
+                            void (*func)(void *), void *info, bool wait)
 {
         struct call_function_data *data;
         unsigned long flags;
-        int cpu, next_cpu;
+        int cpu, next_cpu, this_cpu = smp_processor_id();
 
         /* Can deadlock when called with interrupts disabled */
-        WARN_ON(irqs_disabled());
+        WARN_ON_ONCE(irqs_disabled() && !oops_in_progress);
 
-        /* So, what's a CPU they want?  Ignoring this one. */
+        /* So, what's a CPU they want? Ignoring this one. */
         cpu = cpumask_first_and(mask, cpu_online_mask);
-        if (cpu == smp_processor_id())
+        if (cpu == this_cpu)
                 cpu = cpumask_next_and(cpu, mask, cpu_online_mask);
+
         /* No online cpus?  We're done. */
         if (cpu >= nr_cpu_ids)
                 return;
 
         /* Do we have another CPU which isn't us? */
         next_cpu = cpumask_next_and(cpu, mask, cpu_online_mask);
-        if (next_cpu == smp_processor_id())
+        if (next_cpu == this_cpu)
                 next_cpu = cpumask_next_and(next_cpu, mask, cpu_online_mask);
 
         /* Fastpath: do that cpu by itself. */
@@ -347,43 +388,40 @@ void smp_call_function_many(const struct cpumask *mask,
                 return;
         }
 
-        data = kmalloc(sizeof(*data) + cpumask_size(), GFP_ATOMIC);
-        if (unlikely(!data)) {
-                /* Slow path. */
-                for_each_online_cpu(cpu) {
-                        if (cpu == smp_processor_id())
-                                continue;
-                        if (cpumask_test_cpu(cpu, mask))
-                                smp_call_function_single(cpu, func, info, wait);
-                }
-                return;
-        }
+        data = &__get_cpu_var(cfd_data);
+        csd_lock(&data->csd);
 
-        spin_lock_init(&data->lock);
-        data->csd.flags = CSD_FLAG_ALLOC;
-        if (wait)
-                data->csd.flags |= CSD_FLAG_WAIT;
+        spin_lock_irqsave(&data->lock, flags);
         data->csd.func = func;
         data->csd.info = info;
-        cpumask_and(to_cpumask(data->cpumask_bits), mask, cpu_online_mask);
-        cpumask_clear_cpu(smp_processor_id(), to_cpumask(data->cpumask_bits));
-        data->refs = cpumask_weight(to_cpumask(data->cpumask_bits));
+        cpumask_and(data->cpumask, mask, cpu_online_mask);
+        cpumask_clear_cpu(this_cpu, data->cpumask);
+        data->refs = cpumask_weight(data->cpumask);
 
-        spin_lock_irqsave(&call_function_lock, flags);
-        list_add_tail_rcu(&data->csd.list, &call_function_queue);
-        spin_unlock_irqrestore(&call_function_lock, flags);
+        spin_lock(&call_function.lock);
+        /*
+         * Place entry at the _HEAD_ of the list, so that any cpu still
+         * observing the entry in generic_smp_call_function_interrupt()
+         * will not miss any other list entries:
+         */
+        list_add_rcu(&data->csd.list, &call_function.queue);
+        spin_unlock(&call_function.lock);
+
+        spin_unlock_irqrestore(&data->lock, flags);
 
         /*
          * Make the list addition visible before sending the ipi.
+         * (IPIs must obey or appear to obey normal Linux cache
+         * coherency rules -- see comment in generic_exec_single).
          */
         smp_mb();
 
         /* Send a message to all CPUs in the map */
-        arch_send_call_function_ipi_mask(to_cpumask(data->cpumask_bits));
+        arch_send_call_function_ipi_mask(data->cpumask);
 
-        /* optionally wait for the CPUs to complete */
+        /* Optionally wait for the CPUs to complete */
         if (wait)
-                csd_flag_wait(&data->csd);
+                csd_lock_wait(&data->csd);
 }
 EXPORT_SYMBOL(smp_call_function_many);
 
@@ -391,7 +429,8 @@ EXPORT_SYMBOL(smp_call_function_many);
  * smp_call_function(): Run a function on all other CPUs.
  * @func: The function to run. This must be fast and non-blocking.
  * @info: An arbitrary pointer to pass to the function.
- * @wait: If true, wait (atomically) until function has completed on other CPUs.
+ * @wait: If true, wait (atomically) until function has completed
+ *        on other CPUs.
  *
  * Returns 0.
  *
@@ -407,26 +446,27 @@ int smp_call_function(void (*func)(void *), void *info, int wait)
         preempt_disable();
         smp_call_function_many(cpu_online_mask, func, info, wait);
         preempt_enable();
+
         return 0;
 }
 EXPORT_SYMBOL(smp_call_function);
 
 void ipi_call_lock(void)
 {
-        spin_lock(&call_function_lock);
+        spin_lock(&call_function.lock);
 }
 
 void ipi_call_unlock(void)
 {
-        spin_unlock(&call_function_lock);
+        spin_unlock(&call_function.lock);
 }
 
 void ipi_call_lock_irq(void)
 {
-        spin_lock_irq(&call_function_lock);
+        spin_lock_irq(&call_function.lock);
 }
 
 void ipi_call_unlock_irq(void)
 {
-        spin_unlock_irq(&call_function_lock);
+        spin_unlock_irq(&call_function.lock);
 }
diff --git a/kernel/softirq.c b/kernel/softirq.c
index bdbe9de9cd8d..2fecefacdc5b 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -21,8 +21,10 @@
 #include <linux/freezer.h>
 #include <linux/kthread.h>
 #include <linux/rcupdate.h>
+#include <linux/ftrace.h>
 #include <linux/smp.h>
 #include <linux/tick.h>
+#include <trace/irq.h>
 
 #include <asm/irq.h>
 /*
@@ -52,13 +54,18 @@ static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp
 
 static DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
 
+char *softirq_to_name[NR_SOFTIRQS] = {
+        "HI", "TIMER", "NET_TX", "NET_RX", "BLOCK",
+        "TASKLET", "SCHED", "HRTIMER",  "RCU"
+};
+
 /*
  * we cannot loop indefinitely here to avoid userspace starvation,
  * but we also don't want to introduce a worst case 1/HZ latency
  * to the pending events, so lets the scheduler to balance
  * the softirq load for us.
  */
-static inline void wakeup_softirqd(void)
+void wakeup_softirqd(void)
 {
         /* Interrupts are disabled: no need to stop preemption */
         struct task_struct *tsk = __get_cpu_var(ksoftirqd);
@@ -79,13 +86,23 @@ static void __local_bh_disable(unsigned long ip)
         WARN_ON_ONCE(in_irq());
 
         raw_local_irq_save(flags);
-        add_preempt_count(SOFTIRQ_OFFSET);
+        /*
+         * The preempt tracer hooks into add_preempt_count and will break
+         * lockdep because it calls back into lockdep after SOFTIRQ_OFFSET
+         * is set and before current->softirq_enabled is cleared.
+         * We must manually increment preempt_count here and manually
+         * call the trace_preempt_off later.
+         */
+        preempt_count() += SOFTIRQ_OFFSET;
         /*
          * Were softirqs turned off above:
          */
         if (softirq_count() == SOFTIRQ_OFFSET)
                 trace_softirqs_off(ip);
         raw_local_irq_restore(flags);
+
+        if (preempt_count() == SOFTIRQ_OFFSET)
+                trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
 }
 #else /* !CONFIG_TRACE_IRQFLAGS */
 static inline void __local_bh_disable(unsigned long ip)
@@ -169,6 +186,9 @@ EXPORT_SYMBOL(local_bh_enable_ip);
  */
 #define MAX_SOFTIRQ_RESTART 10
 
+DEFINE_TRACE(softirq_entry);
+DEFINE_TRACE(softirq_exit);
+
 asmlinkage void __do_softirq(void)
 {
         struct softirq_action *h;
@@ -180,7 +200,7 @@ asmlinkage void __do_softirq(void)
         account_system_vtime(current);
 
         __local_bh_disable((unsigned long)__builtin_return_address(0));
-        trace_softirq_enter();
+        lockdep_softirq_enter();
 
         cpu = smp_processor_id();
 restart:
@@ -195,12 +215,14 @@ restart:
                 if (pending & 1) {
                         int prev_count = preempt_count();
 
+                        trace_softirq_entry(h, softirq_vec);
                         h->action(h);
-
+                        trace_softirq_exit(h, softirq_vec);
                         if (unlikely(prev_count != preempt_count())) {
-                                printk(KERN_ERR "huh, entered softirq %td %p"
+                                printk(KERN_ERR "huh, entered softirq %td %s %p"
                                        "with preempt_count %08x,"
                                        " exited with %08x?\n", h - softirq_vec,
+                                       softirq_to_name[h - softirq_vec],
                                        h->action, prev_count, preempt_count());
                                 preempt_count() = prev_count;
                         }
@@ -220,7 +242,7 @@ restart:
         if (pending)
                 wakeup_softirqd();
 
-        trace_softirq_exit();
+        lockdep_softirq_exit();
 
         account_system_vtime(current);
         _local_bh_enable();
@@ -496,7 +518,7 @@ static int __try_remote_softirq(struct call_single_data *cp, int cpu, int softir
                 cp->flags = 0;
                 cp->priv = softirq;
 
-                __smp_call_function_single(cpu, cp);
+                __smp_call_function_single(cpu, cp, 0);
                 return 0;
         }
         return 1;
@@ -626,6 +648,7 @@ static int ksoftirqd(void * __bind_cpu)
                         preempt_enable_no_resched();
                         cond_resched();
                         preempt_disable();
+                        rcu_qsctr_inc((long)__bind_cpu);
                 }
                 preempt_enable();
                 set_current_state(TASK_INTERRUPTIBLE);
@@ -795,6 +818,11 @@ int __init __weak early_irq_init(void)
         return 0;
 }
 
+int __init __weak arch_probe_nr_irqs(void)
+{
+        return 0;
+}
+
 int __init __weak arch_early_irq_init(void)
 {
         return 0;
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 85d5a2455103..88796c330838 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -166,97 +166,11 @@ void softlockup_tick(void)
 }
 
 /*
- * Have a reasonable limit on the number of tasks checked:
- */
-unsigned long __read_mostly sysctl_hung_task_check_count = 1024;
-
-/*
- * Zero means infinite timeout - no checking done:
- */
-unsigned long __read_mostly sysctl_hung_task_timeout_secs = 480;
-
-unsigned long __read_mostly sysctl_hung_task_warnings = 10;
-
-/*
- * Only do the hung-tasks check on one CPU:
- */
-static int check_cpu __read_mostly = -1;
-
-static void check_hung_task(struct task_struct *t, unsigned long now)
-{
-        unsigned long switch_count = t->nvcsw + t->nivcsw;
-
-        if (t->flags & PF_FROZEN)
-                return;
-
-        if (switch_count != t->last_switch_count || !t->last_switch_timestamp) {
-                t->last_switch_count = switch_count;
-                t->last_switch_timestamp = now;
-                return;
-        }
-        if ((long)(now - t->last_switch_timestamp) <
-                                        sysctl_hung_task_timeout_secs)
-                return;
-        if (!sysctl_hung_task_warnings)
-                return;
-        sysctl_hung_task_warnings--;
-
-        /*
-         * Ok, the task did not get scheduled for more than 2 minutes,
-         * complain:
-         */
-        printk(KERN_ERR "INFO: task %s:%d blocked for more than "
-                        "%ld seconds.\n", t->comm, t->pid,
-                        sysctl_hung_task_timeout_secs);
-        printk(KERN_ERR "\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\""
-                        " disables this message.\n");
-        sched_show_task(t);
-        __debug_show_held_locks(t);
-
-        t->last_switch_timestamp = now;
-        touch_nmi_watchdog();
-
-        if (softlockup_panic)
-                panic("softlockup: blocked tasks");
-}
-
-/*
- * Check whether a TASK_UNINTERRUPTIBLE does not get woken up for
- * a really long time (120 seconds). If that happens, print out
- * a warning.
- */
-static void check_hung_uninterruptible_tasks(int this_cpu)
-{
-        int max_count = sysctl_hung_task_check_count;
-        unsigned long now = get_timestamp(this_cpu);
-        struct task_struct *g, *t;
-
-        /*
-         * If the system crashed already then all bets are off,
-         * do not report extra hung tasks:
-         */
-        if (test_taint(TAINT_DIE) || did_panic)
-                return;
-
-        read_lock(&tasklist_lock);
-        do_each_thread(g, t) {
-                if (!--max_count)
-                        goto unlock;
-                /* use "==" to skip the TASK_KILLABLE tasks waiting on NFS */
-                if (t->state == TASK_UNINTERRUPTIBLE)
-                        check_hung_task(t, now);
-        } while_each_thread(g, t);
- unlock:
-        read_unlock(&tasklist_lock);
-}
-
-/*
  * The watchdog thread - runs every second and touches the timestamp.
  */
 static int watchdog(void *__bind_cpu)
 {
         struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
-        int this_cpu = (long)__bind_cpu;
 
         sched_setscheduler(current, SCHED_FIFO, &param);
 
@@ -276,11 +190,6 @@ static int watchdog(void *__bind_cpu)
                 if (kthread_should_stop())
                         break;
 
-                if (this_cpu == check_cpu) {
-                        if (sysctl_hung_task_timeout_secs)
-                                check_hung_uninterruptible_tasks(this_cpu);
-                }
-
                 set_current_state(TASK_INTERRUPTIBLE);
         }
         __set_current_state(TASK_RUNNING);
@@ -312,18 +221,9 @@ cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 break;
         case CPU_ONLINE:
         case CPU_ONLINE_FROZEN:
-                check_cpu = cpumask_any(cpu_online_mask);
                 wake_up_process(per_cpu(watchdog_task, hotcpu));
                 break;
 #ifdef CONFIG_HOTPLUG_CPU
-        case CPU_DOWN_PREPARE:
-        case CPU_DOWN_PREPARE_FROZEN:
-                if (hotcpu == check_cpu) {
-                        /* Pick any other online cpu. */
-                        check_cpu = cpumask_any_but(cpu_online_mask, hotcpu);
-                }
-                break;
-
         case CPU_UP_CANCELED:
         case CPU_UP_CANCELED_FROZEN:
                 if (!per_cpu(watchdog_task, hotcpu))
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index 29ab20749dd3..7932653c4ebd 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -121,7 +121,8 @@ unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
         local_irq_save(flags);
         preempt_disable();
         rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
-        LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
+        LOCK_CONTENDED_FLAGS(lock, _raw_read_trylock, _raw_read_lock,
+                             _raw_read_lock_flags, &flags);
         return flags;
 }
 EXPORT_SYMBOL(_read_lock_irqsave);
@@ -151,7 +152,8 @@ unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
         local_irq_save(flags);
         preempt_disable();
         rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
-        LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
+        LOCK_CONTENDED_FLAGS(lock, _raw_write_trylock, _raw_write_lock,
+                             _raw_write_lock_flags, &flags);
         return flags;
 }
 EXPORT_SYMBOL(_write_lock_irqsave);
@@ -299,16 +301,8 @@ unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclas
         local_irq_save(flags);
         preempt_disable();
         spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
-        /*
-         * On lockdep we dont want the hand-coded irq-enable of
-         * _raw_spin_lock_flags() code, because lockdep assumes
-         * that interrupts are not re-enabled during lock-acquire:
-         */
-#ifdef CONFIG_LOCKDEP
-        LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
-#else
-        _raw_spin_lock_flags(lock, &flags);
-#endif
+        LOCK_CONTENDED_FLAGS(lock, _raw_spin_trylock, _raw_spin_lock,
+                                _raw_spin_lock_flags, &flags);
         return flags;
 }
 EXPORT_SYMBOL(_spin_lock_irqsave_nested);
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 0cd415ee62a2..912823e2a11b 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -44,7 +44,7 @@ static DEFINE_MUTEX(setup_lock);
 static int refcount;
 static struct workqueue_struct *stop_machine_wq;
 static struct stop_machine_data active, idle;
-static const cpumask_t *active_cpus;
+static const struct cpumask *active_cpus;
 static void *stop_machine_work;
 
 static void set_state(enum stopmachine_state newstate)
@@ -170,7 +170,7 @@ int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus)
          * doesn't hit this CPU until we're ready. */
         get_cpu();
         for_each_online_cpu(i) {
-                sm_work = percpu_ptr(stop_machine_work, i);
+                sm_work = per_cpu_ptr(stop_machine_work, i);
                 INIT_WORK(sm_work, stop_cpu);
                 queue_work_on(i, stop_machine_wq, sm_work);
         }
diff --git a/kernel/sys.c b/kernel/sys.c
index f145c415bc16..51dbb55604e8 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -34,6 +34,7 @@
 #include <linux/seccomp.h>
 #include <linux/cpu.h>
 #include <linux/ptrace.h>
+#include <linux/fs_struct.h>
 
 #include <linux/compat.h>
 #include <linux/syscalls.h>
@@ -559,7 +560,7 @@ error:
         abort_creds(new);
         return retval;
 }
-  
+
 /*
  * change the user struct in a credentials set to match the new UID
  */
@@ -571,6 +572,11 @@ static int set_user(struct cred *new)
         if (!new_user)
                 return -EAGAIN;
 
+        if (!task_can_switch_user(new_user, current)) {
+                free_uid(new_user);
+                return -EINVAL;
+        }
+
         if (atomic_read(&new_user->processes) >=
                                 current->signal->rlim[RLIMIT_NPROC].rlim_cur &&
                         new_user != INIT_USER) {
@@ -631,10 +637,11 @@ SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
                         goto error;
         }
 
-        retval = -EAGAIN;
-        if (new->uid != old->uid && set_user(new) < 0)
-                goto error;
-
+        if (new->uid != old->uid) {
+                retval = set_user(new);
+                if (retval < 0)
+                        goto error;
+        }
         if (ruid != (uid_t) -1 ||
             (euid != (uid_t) -1 && euid != old->uid))
                 new->suid = new->euid;
@@ -680,9 +687,10 @@ SYSCALL_DEFINE1(setuid, uid_t, uid)
         retval = -EPERM;
         if (capable(CAP_SETUID)) {
                 new->suid = new->uid = uid;
-                if (uid != old->uid && set_user(new) < 0) {
-                        retval = -EAGAIN;
-                        goto error;
+                if (uid != old->uid) {
+                        retval = set_user(new);
+                        if (retval < 0)
+                                goto error;
                 }
         } else if (uid != old->uid && uid != new->suid) {
                 goto error;
@@ -734,11 +742,13 @@ SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
                         goto error;
         }
 
-        retval = -EAGAIN;
         if (ruid != (uid_t) -1) {
                 new->uid = ruid;
-                if (ruid != old->uid && set_user(new) < 0)
-                        goto error;
+                if (ruid != old->uid) {
+                        retval = set_user(new);
+                        if (retval < 0)
+                                goto error;
+                }
         }
         if (euid != (uid_t) -1)
                 new->euid = euid;
@@ -1004,10 +1014,8 @@ SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
         if (err)
                 goto out;
 
-        if (task_pgrp(p) != pgrp) {
+        if (task_pgrp(p) != pgrp)
                 change_pid(p, PIDTYPE_PGID, pgrp);
-                set_task_pgrp(p, pid_nr(pgrp));
-        }
 
         err = 0;
 out:
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 790f9d785663..4286b62b34a0 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -48,6 +48,7 @@
 #include <linux/acpi.h>
 #include <linux/reboot.h>
 #include <linux/ftrace.h>
+#include <linux/slow-work.h>
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
@@ -95,13 +96,12 @@ static int sixty = 60;
 static int neg_one = -1;
 #endif
 
-#if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
-static int two = 2;
-#endif
-
 static int zero;
-static int one = 1;
+static int __maybe_unused one = 1;
+static int __maybe_unused two = 2;
+static unsigned long one_ul = 1;
 static int one_hundred = 100;
+static int one_thousand = 1000;
 
 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 static int maxolduid = 65535;
@@ -814,6 +814,19 @@ static struct ctl_table kern_table[] = {
                 .extra1         = &neg_one,
                 .extra2         = &sixty,
         },
+#endif
+#ifdef CONFIG_DETECT_HUNG_TASK
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "hung_task_panic",
+                .data           = &sysctl_hung_task_panic,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_minmax,
+                .strategy       = &sysctl_intvec,
+                .extra1         = &zero,
+                .extra2         = &one,
+        },
         {
                 .ctl_name       = CTL_UNNUMBERED,
                 .procname       = "hung_task_check_count",
@@ -829,7 +842,7 @@ static struct ctl_table kern_table[] = {
                 .data           = &sysctl_hung_task_timeout_secs,
                 .maxlen         = sizeof(unsigned long),
                 .mode           = 0644,
-                .proc_handler   = &proc_doulongvec_minmax,
+                .proc_handler   = &proc_dohung_task_timeout_secs,
                 .strategy       = &sysctl_intvec,
         },
         {
@@ -899,6 +912,14 @@ static struct ctl_table kern_table[] = {
                 .proc_handler   = &scan_unevictable_handler,
         },
 #endif
+#ifdef CONFIG_SLOW_WORK
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "slow-work",
+                .mode           = 0555,
+                .child          = slow_work_sysctls,
+        },
+#endif
 /*
  * NOTE: do not add new entries to this table unless you have read
  * Documentation/sysctl/ctl_unnumbered.txt
@@ -974,7 +995,7 @@ static struct ctl_table vm_table[] = {
                 .mode           = 0644,
                 .proc_handler   = &dirty_background_bytes_handler,
                 .strategy       = &sysctl_intvec,
-                .extra1         = &one,
+                .extra1         = &one_ul,
         },
         {
                 .ctl_name       = VM_DIRTY_RATIO,
@@ -995,7 +1016,7 @@ static struct ctl_table vm_table[] = {
                 .mode           = 0644,
                 .proc_handler   = &dirty_bytes_handler,
                 .strategy       = &sysctl_intvec,
-                .extra1         = &one,
+                .extra1         = &one_ul,
         },
         {
                 .procname       = "dirty_writeback_centisecs",
@@ -1009,7 +1030,7 @@ static struct ctl_table vm_table[] = {
                 .data           = &dirty_expire_interval,
                 .maxlen         = sizeof(dirty_expire_interval),
                 .mode           = 0644,
-                .proc_handler   = &proc_dointvec_userhz_jiffies,
+                .proc_handler   = &proc_dointvec,
         },
         {
                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
@@ -1020,6 +1041,28 @@ static struct ctl_table vm_table[] = {
                 .proc_handler   = &proc_dointvec,
         },
         {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "nr_pdflush_threads_min",
+                .data           = &nr_pdflush_threads_min,
+                .maxlen         = sizeof nr_pdflush_threads_min,
+                .mode           = 0644 /* read-write */,
+                .proc_handler   = &proc_dointvec_minmax,
+                .strategy       = &sysctl_intvec,
+                .extra1         = &one,
+                .extra2         = &nr_pdflush_threads_max,
+        },
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "nr_pdflush_threads_max",
+                .data           = &nr_pdflush_threads_max,
+                .maxlen         = sizeof nr_pdflush_threads_max,
+                .mode           = 0644 /* read-write */,
+                .proc_handler   = &proc_dointvec_minmax,
+                .strategy       = &sysctl_intvec,
+                .extra1         = &nr_pdflush_threads_min,
+                .extra2         = &one_thousand,
+        },
+        {
                 .ctl_name       = VM_SWAPPINESS,
                 .procname       = "swappiness",
                 .data           = &vm_swappiness,
@@ -1372,10 +1415,7 @@ static struct ctl_table fs_table[] = {
                 .data           = &lease_break_time,
                 .maxlen         = sizeof(int),
                 .mode           = 0644,
-                .proc_handler   = &proc_dointvec_minmax,
-                .strategy       = &sysctl_intvec,
-                .extra1         = &zero,
-                .extra2         = &two,
+                .proc_handler   = &proc_dointvec,
         },
 #endif
 #ifdef CONFIG_AIO
@@ -1416,7 +1456,10 @@ static struct ctl_table fs_table[] = {
                 .data           = &suid_dumpable,
                 .maxlen         = sizeof(int),
                 .mode           = 0644,
-                .proc_handler   = &proc_dointvec,
+                .proc_handler   = &proc_dointvec_minmax,
+                .strategy       = &sysctl_intvec,
+                .extra1         = &zero,
+                .extra2         = &two,
         },
 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
         {
diff --git a/kernel/sysctl_check.c b/kernel/sysctl_check.c
index fafeb48f27c0..b38423ca711a 100644
--- a/kernel/sysctl_check.c
+++ b/kernel/sysctl_check.c
@@ -219,6 +219,7 @@ static const struct trans_ctl_table trans_net_ipv4_conf_vars_table[] = {
         { NET_IPV4_CONF_ARP_IGNORE,             "arp_ignore" },
         { NET_IPV4_CONF_PROMOTE_SECONDARIES,    "promote_secondaries" },
         { NET_IPV4_CONF_ARP_ACCEPT,             "arp_accept" },
+        { NET_IPV4_CONF_ARP_NOTIFY,             "arp_notify" },
         {}
 };
 
diff --git a/kernel/time/Makefile b/kernel/time/Makefile
index 905b0b50792d..0b0a6366c9d4 100644
--- a/kernel/time/Makefile
+++ b/kernel/time/Makefile
@@ -1,4 +1,4 @@
-obj-y += timekeeping.o ntp.o clocksource.o jiffies.o timer_list.o
+obj-y += timekeeping.o ntp.o clocksource.o jiffies.o timer_list.o timecompare.o
 
 obj-$(CONFIG_GENERIC_CLOCKEVENTS_BUILD)         += clockevents.o
 obj-$(CONFIG_GENERIC_CLOCKEVENTS)               += tick-common.o
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index ea2f48af83cf..d13be216a790 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -68,6 +68,17 @@ void clockevents_set_mode(struct clock_event_device *dev,
         if (dev->mode != mode) {
                 dev->set_mode(mode, dev);
                 dev->mode = mode;
+
+                /*
+                 * A nsec2cyc multiplicator of 0 is invalid and we'd crash
+                 * on it, so fix it up and emit a warning:
+                 */
+                if (mode == CLOCK_EVT_MODE_ONESHOT) {
+                        if (unlikely(!dev->mult)) {
+                                dev->mult = 1;
+                                WARN_ON(1);
+                        }
+                }
         }
 }
 
@@ -168,15 +179,6 @@ void clockevents_register_device(struct clock_event_device *dev)
         BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
         BUG_ON(!dev->cpumask);
 
-        /*
-         * A nsec2cyc multiplicator of 0 is invalid and we'd crash
-         * on it, so fix it up and emit a warning:
-         */
-        if (unlikely(!dev->mult)) {
-                dev->mult = 1;
-                WARN_ON(1);
-        }
-
         spin_lock(&clockevents_lock);
 
         list_add(&dev->list, &clockevent_devices);
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index ca89e1593f08..c46c931a7fe7 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -31,6 +31,82 @@
 #include <linux/sched.h> /* for spin_unlock_irq() using preempt_count() m68k */
 #include <linux/tick.h>
 
+void timecounter_init(struct timecounter *tc,
+                      const struct cyclecounter *cc,
+                      u64 start_tstamp)
+{
+        tc->cc = cc;
+        tc->cycle_last = cc->read(cc);
+        tc->nsec = start_tstamp;
+}
+EXPORT_SYMBOL(timecounter_init);
+
+/**
+ * timecounter_read_delta - get nanoseconds since last call of this function
+ * @tc:         Pointer to time counter
+ *
+ * When the underlying cycle counter runs over, this will be handled
+ * correctly as long as it does not run over more than once between
+ * calls.
+ *
+ * The first call to this function for a new time counter initializes
+ * the time tracking and returns an undefined result.
+ */
+static u64 timecounter_read_delta(struct timecounter *tc)
+{
+        cycle_t cycle_now, cycle_delta;
+        u64 ns_offset;
+
+        /* read cycle counter: */
+        cycle_now = tc->cc->read(tc->cc);
+
+        /* calculate the delta since the last timecounter_read_delta(): */
+        cycle_delta = (cycle_now - tc->cycle_last) & tc->cc->mask;
+
+        /* convert to nanoseconds: */
+        ns_offset = cyclecounter_cyc2ns(tc->cc, cycle_delta);
+
+        /* update time stamp of timecounter_read_delta() call: */
+        tc->cycle_last = cycle_now;
+
+        return ns_offset;
+}
+
+u64 timecounter_read(struct timecounter *tc)
+{
+        u64 nsec;
+
+        /* increment time by nanoseconds since last call */
+        nsec = timecounter_read_delta(tc);
+        nsec += tc->nsec;
+        tc->nsec = nsec;
+
+        return nsec;
+}
+EXPORT_SYMBOL(timecounter_read);
+
+u64 timecounter_cyc2time(struct timecounter *tc,
+                         cycle_t cycle_tstamp)
+{
+        u64 cycle_delta = (cycle_tstamp - tc->cycle_last) & tc->cc->mask;
+        u64 nsec;
+
+        /*
+         * Instead of always treating cycle_tstamp as more recent
+         * than tc->cycle_last, detect when it is too far in the
+         * future and treat it as old time stamp instead.
+         */
+        if (cycle_delta > tc->cc->mask / 2) {
+                cycle_delta = (tc->cycle_last - cycle_tstamp) & tc->cc->mask;
+                nsec = tc->nsec - cyclecounter_cyc2ns(tc->cc, cycle_delta);
+        } else {
+                nsec = cyclecounter_cyc2ns(tc->cc, cycle_delta) + tc->nsec;
+        }
+
+        return nsec;
+}
+EXPORT_SYMBOL(timecounter_cyc2time);
+
 /* XXX - Would like a better way for initializing curr_clocksource */
 extern struct clocksource clocksource_jiffies;
 
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index f5f793d92415..7fc64375ff43 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -1,71 +1,129 @@
 /*
- * linux/kernel/time/ntp.c
- *
  * NTP state machine interfaces and logic.
  *
  * This code was mainly moved from kernel/timer.c and kernel/time.c
  * Please see those files for relevant copyright info and historical
  * changelogs.
  */
-
-#include <linux/mm.h>
-#include <linux/time.h>
-#include <linux/timex.h>
-#include <linux/jiffies.h>
-#include <linux/hrtimer.h>
 #include <linux/capability.h>
-#include <linux/math64.h>
 #include <linux/clocksource.h>
 #include <linux/workqueue.h>
-#include <asm/timex.h>
+#include <linux/hrtimer.h>
+#include <linux/jiffies.h>
+#include <linux/math64.h>
+#include <linux/timex.h>
+#include <linux/time.h>
+#include <linux/mm.h>
 
 /*
- * Timekeeping variables
+ * NTP timekeeping variables:
  */
-unsigned long tick_usec = TICK_USEC;            /* USER_HZ period (usec) */
-unsigned long tick_nsec;                        /* ACTHZ period (nsec) */
-u64 tick_length;
-static u64 tick_length_base;
 
-static struct hrtimer leap_timer;
+/* USER_HZ period (usecs): */
+unsigned long                   tick_usec = TICK_USEC;
 
-#define MAX_TICKADJ             500             /* microsecs */
-#define MAX_TICKADJ_SCALED      (((u64)(MAX_TICKADJ * NSEC_PER_USEC) << \
-                                  NTP_SCALE_SHIFT) / NTP_INTERVAL_FREQ)
+/* ACTHZ period (nsecs): */
+unsigned long                   tick_nsec;
+
+u64                             tick_length;
+static u64                      tick_length_base;
+
+static struct hrtimer           leap_timer;
+
+#define MAX_TICKADJ             500LL           /* usecs */
+#define MAX_TICKADJ_SCALED \
+        (((MAX_TICKADJ * NSEC_PER_USEC) << NTP_SCALE_SHIFT) / NTP_INTERVAL_FREQ)
 
 /*
  * phase-lock loop variables
  */
-/* TIME_ERROR prevents overwriting the CMOS clock */
-static int time_state = TIME_OK;        /* clock synchronization status */
-int time_status = STA_UNSYNC;           /* clock status bits            */
-static long time_tai;                   /* TAI offset (s)               */
-static s64 time_offset;                 /* time adjustment (ns)         */
-static long time_constant = 2;          /* pll time constant            */
-long time_maxerror = NTP_PHASE_LIMIT;   /* maximum error (us)           */
-long time_esterror = NTP_PHASE_LIMIT;   /* estimated error (us)         */
-static s64 time_freq;                   /* frequency offset (scaled ns/s)*/
-static long time_reftime;               /* time at last adjustment (s)  */
-long time_adjust;
-static long ntp_tick_adj;
 
+/*
+ * clock synchronization status
+ *
+ * (TIME_ERROR prevents overwriting the CMOS clock)
+ */
+static int                      time_state = TIME_OK;
+
+/* clock status bits:                                                   */
+int                             time_status = STA_UNSYNC;
+
+/* TAI offset (secs):                                                   */
+static long                     time_tai;
+
+/* time adjustment (nsecs):                                             */
+static s64                      time_offset;
+
+/* pll time constant:                                                   */
+static long                     time_constant = 2;
+
+/* maximum error (usecs):                                               */
+long                            time_maxerror = NTP_PHASE_LIMIT;
+
+/* estimated error (usecs):                                             */
+long                            time_esterror = NTP_PHASE_LIMIT;
+
+/* frequency offset (scaled nsecs/secs):                                */
+static s64                      time_freq;
+
+/* time at last adjustment (secs):                                      */
+static long                     time_reftime;
+
+long                            time_adjust;
+
+/* constant (boot-param configurable) NTP tick adjustment (upscaled)    */
+static s64                      ntp_tick_adj;
+
+/*
+ * NTP methods:
+ */
+
+/*
+ * Update (tick_length, tick_length_base, tick_nsec), based
+ * on (tick_usec, ntp_tick_adj, time_freq):
+ */
 static void ntp_update_frequency(void)
 {
-        u64 second_length = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ)
-                                << NTP_SCALE_SHIFT;
-        second_length += (s64)ntp_tick_adj << NTP_SCALE_SHIFT;
-        second_length += time_freq;
+        u64 second_length;
+        u64 new_base;
+
+        second_length            = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ)
+                                                << NTP_SCALE_SHIFT;
+
+        second_length           += ntp_tick_adj;
+        second_length           += time_freq;
 
-        tick_length_base = second_length;
+        tick_nsec                = div_u64(second_length, HZ) >> NTP_SCALE_SHIFT;
+        new_base                 = div_u64(second_length, NTP_INTERVAL_FREQ);
 
-        tick_nsec = div_u64(second_length, HZ) >> NTP_SCALE_SHIFT;
-        tick_length_base = div_u64(tick_length_base, NTP_INTERVAL_FREQ);
+        /*
+         * Don't wait for the next second_overflow, apply
+         * the change to the tick length immediately:
+         */
+        tick_length             += new_base - tick_length_base;
+        tick_length_base         = new_base;
+}
+
+static inline s64 ntp_update_offset_fll(s64 offset64, long secs)
+{
+        time_status &= ~STA_MODE;
+
+        if (secs < MINSEC)
+                return 0;
+
+        if (!(time_status & STA_FLL) && (secs <= MAXSEC))
+                return 0;
+
+        time_status |= STA_MODE;
+
+        return div_s64(offset64 << (NTP_SCALE_SHIFT - SHIFT_FLL), secs);
 }
 
 static void ntp_update_offset(long offset)
 {
-        long mtemp;
         s64 freq_adj;
+        s64 offset64;
+        long secs;
 
         if (!(time_status & STA_PLL))
                 return;
@@ -84,24 +142,23 @@ static void ntp_update_offset(long offset)
          * Select how the frequency is to be controlled
          * and in which mode (PLL or FLL).
          */
-        if (time_status & STA_FREQHOLD || time_reftime == 0)
-                time_reftime = xtime.tv_sec;
-        mtemp = xtime.tv_sec - time_reftime;
+        secs = xtime.tv_sec - time_reftime;
+        if (unlikely(time_status & STA_FREQHOLD))
+                secs = 0;
+
         time_reftime = xtime.tv_sec;
 
-        freq_adj = (s64)offset * mtemp;
-        freq_adj <<= NTP_SCALE_SHIFT - 2 * (SHIFT_PLL + 2 + time_constant);
-        time_status &= ~STA_MODE;
-        if (mtemp >= MINSEC && (time_status & STA_FLL || mtemp > MAXSEC)) {
-                freq_adj += div_s64((s64)offset << (NTP_SCALE_SHIFT - SHIFT_FLL),
-                                    mtemp);
-                time_status |= STA_MODE;
-        }
-        freq_adj += time_freq;
-        freq_adj = min(freq_adj, MAXFREQ_SCALED);
-        time_freq = max(freq_adj, -MAXFREQ_SCALED);
+        offset64    = offset;
+        freq_adj    = (offset64 * secs) <<
+                        (NTP_SCALE_SHIFT - 2 * (SHIFT_PLL + 2 + time_constant));
 
-        time_offset = div_s64((s64)offset << NTP_SCALE_SHIFT, NTP_INTERVAL_FREQ);
+        freq_adj    += ntp_update_offset_fll(offset64, secs);
+
+        freq_adj    = min(freq_adj + time_freq, MAXFREQ_SCALED);
+
+        time_freq   = max(freq_adj, -MAXFREQ_SCALED);
+
+        time_offset = div_s64(offset64 << NTP_SCALE_SHIFT, NTP_INTERVAL_FREQ);
 }
 
 /**
@@ -111,15 +168,15 @@ static void ntp_update_offset(long offset)
  */
 void ntp_clear(void)
 {
-        time_adjust = 0;                /* stop active adjtime() */
-        time_status |= STA_UNSYNC;
-        time_maxerror = NTP_PHASE_LIMIT;
-        time_esterror = NTP_PHASE_LIMIT;
+        time_adjust     = 0;            /* stop active adjtime() */
+        time_status     |= STA_UNSYNC;
+        time_maxerror   = NTP_PHASE_LIMIT;
+        time_esterror   = NTP_PHASE_LIMIT;
 
         ntp_update_frequency();
 
-        tick_length = tick_length_base;
-        time_offset = 0;
+        tick_length     = tick_length_base;
+        time_offset     = 0;
 }
 
 /*
@@ -140,8 +197,8 @@ static enum hrtimer_restart ntp_leap_second(struct hrtimer *timer)
                 xtime.tv_sec--;
                 wall_to_monotonic.tv_sec++;
                 time_state = TIME_OOP;
-                printk(KERN_NOTICE "Clock: "
-                       "inserting leap second 23:59:60 UTC\n");
+                printk(KERN_NOTICE
+                        "Clock: inserting leap second 23:59:60 UTC\n");
                 hrtimer_add_expires_ns(&leap_timer, NSEC_PER_SEC);
                 res = HRTIMER_RESTART;
                 break;
@@ -150,8 +207,8 @@ static enum hrtimer_restart ntp_leap_second(struct hrtimer *timer)
                 time_tai--;
                 wall_to_monotonic.tv_sec--;
                 time_state = TIME_WAIT;
-                printk(KERN_NOTICE "Clock: "
-                       "deleting leap second 23:59:59 UTC\n");
+                printk(KERN_NOTICE
+                        "Clock: deleting leap second 23:59:59 UTC\n");
                 break;
         case TIME_OOP:
                 time_tai++;
@@ -179,7 +236,7 @@ static enum hrtimer_restart ntp_leap_second(struct hrtimer *timer)
  */
 void second_overflow(void)
 {
-        s64 time_adj;
+        s64 delta;
 
         /* Bump the maxerror field */
         time_maxerror += MAXFREQ / NSEC_PER_USEC;
@@ -192,24 +249,30 @@ void second_overflow(void)
          * Compute the phase adjustment for the next second. The offset is
          * reduced by a fixed factor times the time constant.
          */
-        tick_length = tick_length_base;
-        time_adj = shift_right(time_offset, SHIFT_PLL + time_constant);
-        time_offset -= time_adj;
-        tick_length += time_adj;
-
-        if (unlikely(time_adjust)) {
-                if (time_adjust > MAX_TICKADJ) {
-                        time_adjust -= MAX_TICKADJ;
-                        tick_length += MAX_TICKADJ_SCALED;
-                } else if (time_adjust < -MAX_TICKADJ) {
-                        time_adjust += MAX_TICKADJ;
-                        tick_length -= MAX_TICKADJ_SCALED;
-                } else {
-                        tick_length += (s64)(time_adjust * NSEC_PER_USEC /
-                                        NTP_INTERVAL_FREQ) << NTP_SCALE_SHIFT;
-                        time_adjust = 0;
-                }
+        tick_length      = tick_length_base;
+
+        delta            = shift_right(time_offset, SHIFT_PLL + time_constant);
+        time_offset     -= delta;
+        tick_length     += delta;
+
+        if (!time_adjust)
+                return;
+
+        if (time_adjust > MAX_TICKADJ) {
+                time_adjust -= MAX_TICKADJ;
+                tick_length += MAX_TICKADJ_SCALED;
+                return;
         }
+
+        if (time_adjust < -MAX_TICKADJ) {
+                time_adjust += MAX_TICKADJ;
+                tick_length -= MAX_TICKADJ_SCALED;
+                return;
+        }
+
+        tick_length += (s64)(time_adjust * NSEC_PER_USEC / NTP_INTERVAL_FREQ)
+                                                         << NTP_SCALE_SHIFT;
+        time_adjust = 0;
 }
 
 #ifdef CONFIG_GENERIC_CMOS_UPDATE
@@ -233,12 +296,13 @@ static void sync_cmos_clock(struct work_struct *work)
          * This code is run on a timer.  If the clock is set, that timer
          * may not expire at the correct time.  Thus, we adjust...
          */
-        if (!ntp_synced())
+        if (!ntp_synced()) {
                 /*
                  * Not synced, exit, do not restart a timer (if one is
                  * running, let it run out).
                  */
                 return;
+        }
 
         getnstimeofday(&now);
         if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec / 2)
@@ -270,7 +334,116 @@ static void notify_cmos_timer(void)
 static inline void notify_cmos_timer(void) { }
 #endif
 
-/* adjtimex mainly allows reading (and writing, if superuser) of
+/*
+ * Start the leap seconds timer:
+ */
+static inline void ntp_start_leap_timer(struct timespec *ts)
+{
+        long now = ts->tv_sec;
+
+        if (time_status & STA_INS) {
+                time_state = TIME_INS;
+                now += 86400 - now % 86400;
+                hrtimer_start(&leap_timer, ktime_set(now, 0), HRTIMER_MODE_ABS);
+
+                return;
+        }
+
+        if (time_status & STA_DEL) {
+                time_state = TIME_DEL;
+                now += 86400 - (now + 1) % 86400;
+                hrtimer_start(&leap_timer, ktime_set(now, 0), HRTIMER_MODE_ABS);
+        }
+}
+
+/*
+ * Propagate a new txc->status value into the NTP state:
+ */
+static inline void process_adj_status(struct timex *txc, struct timespec *ts)
+{
+        if ((time_status & STA_PLL) && !(txc->status & STA_PLL)) {
+                time_state = TIME_OK;
+                time_status = STA_UNSYNC;
+        }
+
+        /*
+         * If we turn on PLL adjustments then reset the
+         * reference time to current time.
+         */
+        if (!(time_status & STA_PLL) && (txc->status & STA_PLL))
+                time_reftime = xtime.tv_sec;
+
+        /* only set allowed bits */
+        time_status &= STA_RONLY;
+        time_status |= txc->status & ~STA_RONLY;
+
+        switch (time_state) {
+        case TIME_OK:
+                ntp_start_leap_timer(ts);
+                break;
+        case TIME_INS:
+        case TIME_DEL:
+                time_state = TIME_OK;
+                ntp_start_leap_timer(ts);
+        case TIME_WAIT:
+                if (!(time_status & (STA_INS | STA_DEL)))
+                        time_state = TIME_OK;
+                break;
+        case TIME_OOP:
+                hrtimer_restart(&leap_timer);
+                break;
+        }
+}
+/*
+ * Called with the xtime lock held, so we can access and modify
+ * all the global NTP state:
+ */
+static inline void process_adjtimex_modes(struct timex *txc, struct timespec *ts)
+{
+        if (txc->modes & ADJ_STATUS)
+                process_adj_status(txc, ts);
+
+        if (txc->modes & ADJ_NANO)
+                time_status |= STA_NANO;
+
+        if (txc->modes & ADJ_MICRO)
+                time_status &= ~STA_NANO;
+
+        if (txc->modes & ADJ_FREQUENCY) {
+                time_freq = txc->freq * PPM_SCALE;
+                time_freq = min(time_freq, MAXFREQ_SCALED);
+                time_freq = max(time_freq, -MAXFREQ_SCALED);
+        }
+
+        if (txc->modes & ADJ_MAXERROR)
+                time_maxerror = txc->maxerror;
+
+        if (txc->modes & ADJ_ESTERROR)
+                time_esterror = txc->esterror;
+
+        if (txc->modes & ADJ_TIMECONST) {
+                time_constant = txc->constant;
+                if (!(time_status & STA_NANO))
+                        time_constant += 4;
+                time_constant = min(time_constant, (long)MAXTC);
+                time_constant = max(time_constant, 0l);
+        }
+
+        if (txc->modes & ADJ_TAI && txc->constant > 0)
+                time_tai = txc->constant;
+
+        if (txc->modes & ADJ_OFFSET)
+                ntp_update_offset(txc->offset);
+
+        if (txc->modes & ADJ_TICK)
+                tick_usec = txc->tick;
+
+        if (txc->modes & (ADJ_TICK|ADJ_FREQUENCY|ADJ_OFFSET))
+                ntp_update_frequency();
+}
+
+/*
+ * adjtimex mainly allows reading (and writing, if superuser) of
  * kernel time-keeping variables. used by xntpd.
  */
 int do_adjtimex(struct timex *txc)
@@ -291,11 +464,14 @@ int do_adjtimex(struct timex *txc)
                  if (txc->modes && !capable(CAP_SYS_TIME))
                         return -EPERM;
 
-                /* if the quartz is off by more than 10% something is VERY wrong! */
+                /*
+                 * if the quartz is off by more than 10% then
+                 * something is VERY wrong!
+                 */
                 if (txc->modes & ADJ_TICK &&
                     (txc->tick <  900000/USER_HZ ||
                      txc->tick > 1100000/USER_HZ))
-                                return -EINVAL;
+                        return -EINVAL;
 
                 if (txc->modes & ADJ_STATUS && time_state != TIME_OK)
                         hrtimer_cancel(&leap_timer);
@@ -305,7 +481,6 @@ int do_adjtimex(struct timex *txc)
 
         write_seqlock_irq(&xtime_lock);
 
-        /* If there are input parameters, then process them */
         if (txc->modes & ADJ_ADJTIME) {
                 long save_adjust = time_adjust;
 
@@ -315,98 +490,24 @@ int do_adjtimex(struct timex *txc)
                         ntp_update_frequency();
                 }
                 txc->offset = save_adjust;
-                goto adj_done;
-        }
-        if (txc->modes) {
-                long sec;
-
-                if (txc->modes & ADJ_STATUS) {
-                        if ((time_status & STA_PLL) &&
-                            !(txc->status & STA_PLL)) {
-                                time_state = TIME_OK;
-                                time_status = STA_UNSYNC;
-                        }
-                        /* only set allowed bits */
-                        time_status &= STA_RONLY;
-                        time_status |= txc->status & ~STA_RONLY;
-
-                        switch (time_state) {
-                        case TIME_OK:
-                        start_timer:
-                                sec = ts.tv_sec;
-                                if (time_status & STA_INS) {
-                                        time_state = TIME_INS;
-                                        sec += 86400 - sec % 86400;
-                                        hrtimer_start(&leap_timer, ktime_set(sec, 0), HRTIMER_MODE_ABS);
-                                } else if (time_status & STA_DEL) {
-                                        time_state = TIME_DEL;
-                                        sec += 86400 - (sec + 1) % 86400;
-                                        hrtimer_start(&leap_timer, ktime_set(sec, 0), HRTIMER_MODE_ABS);
-                                }
-                                break;
-                        case TIME_INS:
-                        case TIME_DEL:
-                                time_state = TIME_OK;
-                                goto start_timer;
-                                break;
-                        case TIME_WAIT:
-                                if (!(time_status & (STA_INS | STA_DEL)))
-                                        time_state = TIME_OK;
-                                break;
-                        case TIME_OOP:
-                                hrtimer_restart(&leap_timer);
-                                break;
-                        }
-                }
-
-                if (txc->modes & ADJ_NANO)
-                        time_status |= STA_NANO;
-                if (txc->modes & ADJ_MICRO)
-                        time_status &= ~STA_NANO;
-
-                if (txc->modes & ADJ_FREQUENCY) {
-                        time_freq = (s64)txc->freq * PPM_SCALE;
-                        time_freq = min(time_freq, MAXFREQ_SCALED);
-                        time_freq = max(time_freq, -MAXFREQ_SCALED);
-                }
-
-                if (txc->modes & ADJ_MAXERROR)
-                        time_maxerror = txc->maxerror;
-                if (txc->modes & ADJ_ESTERROR)
-                        time_esterror = txc->esterror;
-
-                if (txc->modes & ADJ_TIMECONST) {
-                        time_constant = txc->constant;
-                        if (!(time_status & STA_NANO))
-                                time_constant += 4;
-                        time_constant = min(time_constant, (long)MAXTC);
-                        time_constant = max(time_constant, 0l);
-                }
-
-                if (txc->modes & ADJ_TAI && txc->constant > 0)
-                        time_tai = txc->constant;
-
-                if (txc->modes & ADJ_OFFSET)
-                        ntp_update_offset(txc->offset);
-                if (txc->modes & ADJ_TICK)
-                        tick_usec = txc->tick;
+        } else {
 
-                if (txc->modes & (ADJ_TICK|ADJ_FREQUENCY|ADJ_OFFSET))
-                        ntp_update_frequency();
-        }
+                /* If there are input parameters, then process them: */
+                if (txc->modes)
+                        process_adjtimex_modes(txc, &ts);
 
-        txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
+                txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
                                   NTP_SCALE_SHIFT);
-        if (!(time_status & STA_NANO))
-                txc->offset /= NSEC_PER_USEC;
+                if (!(time_status & STA_NANO))
+                        txc->offset /= NSEC_PER_USEC;
+        }
 
-adj_done:
         result = time_state;    /* mostly `TIME_OK' */
         if (time_status & (STA_UNSYNC|STA_CLOCKERR))
                 result = TIME_ERROR;
 
         txc->freq          = shift_right((time_freq >> PPM_SCALE_INV_SHIFT) *
-                                         (s64)PPM_SCALE_INV, NTP_SCALE_SHIFT);
+                                         PPM_SCALE_INV, NTP_SCALE_SHIFT);
         txc->maxerror      = time_maxerror;
         txc->esterror      = time_esterror;
         txc->status        = time_status;
@@ -425,6 +526,7 @@ adj_done:
         txc->calcnt        = 0;
         txc->errcnt        = 0;
         txc->stbcnt        = 0;
+
         write_sequnlock_irq(&xtime_lock);
 
         txc->time.tv_sec = ts.tv_sec;
@@ -440,6 +542,8 @@ adj_done:
 static int __init ntp_tick_adj_setup(char *str)
 {
         ntp_tick_adj = simple_strtol(str, NULL, 0);
+        ntp_tick_adj <<= NTP_SCALE_SHIFT;
+
         return 1;
 }
 
diff --git a/kernel/time/timecompare.c b/kernel/time/timecompare.c
new file mode 100644
index 000000000000..71e7f1a19156
--- /dev/null
+++ b/kernel/time/timecompare.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright (C) 2009 Intel Corporation.
+ * Author: Patrick Ohly <patrick.ohly@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/timecompare.h>
+#include <linux/module.h>
+#include <linux/math64.h>
+
+/*
+ * fixed point arithmetic scale factor for skew
+ *
+ * Usually one would measure skew in ppb (parts per billion, 1e9), but
+ * using a factor of 2 simplifies the math.
+ */
+#define TIMECOMPARE_SKEW_RESOLUTION (((s64)1)<<30)
+
+ktime_t timecompare_transform(struct timecompare *sync,
+                              u64 source_tstamp)
+{
+        u64 nsec;
+
+        nsec = source_tstamp + sync->offset;
+        nsec += (s64)(source_tstamp - sync->last_update) * sync->skew /
+                TIMECOMPARE_SKEW_RESOLUTION;
+
+        return ns_to_ktime(nsec);
+}
+EXPORT_SYMBOL(timecompare_transform);
+
+int timecompare_offset(struct timecompare *sync,
+                       s64 *offset,
+                       u64 *source_tstamp)
+{
+        u64 start_source = 0, end_source = 0;
+        struct {
+                s64 offset;
+                s64 duration_target;
+        } buffer[10], sample, *samples;
+        int counter = 0, i;
+        int used;
+        int index;
+        int num_samples = sync->num_samples;
+
+        if (num_samples > sizeof(buffer)/sizeof(buffer[0])) {
+                samples = kmalloc(sizeof(*samples) * num_samples, GFP_ATOMIC);
+                if (!samples) {
+                        samples = buffer;
+                        num_samples = sizeof(buffer)/sizeof(buffer[0]);
+                }
+        } else {
+                samples = buffer;
+        }
+
+        /* run until we have enough valid samples, but do not try forever */
+        i = 0;
+        counter = 0;
+        while (1) {
+                u64 ts;
+                ktime_t start, end;
+
+                start = sync->target();
+                ts = timecounter_read(sync->source);
+                end = sync->target();
+
+                if (!i)
+                        start_source = ts;
+
+                /* ignore negative durations */
+                sample.duration_target = ktime_to_ns(ktime_sub(end, start));
+                if (sample.duration_target >= 0) {
+                        /*
+                         * assume symetric delay to and from source:
+                         * average target time corresponds to measured
+                         * source time
+                         */
+                        sample.offset =
+                                ktime_to_ns(ktime_add(end, start)) / 2 -
+                                ts;
+
+                        /* simple insertion sort based on duration */
+                        index = counter - 1;
+                        while (index >= 0) {
+                                if (samples[index].duration_target <
+                                    sample.duration_target)
+                                        break;
+                                samples[index + 1] = samples[index];
+                                index--;
+                        }
+                        samples[index + 1] = sample;
+                        counter++;
+                }
+
+                i++;
+                if (counter >= num_samples || i >= 100000) {
+                        end_source = ts;
+                        break;
+                }
+        }
+
+        *source_tstamp = (end_source + start_source) / 2;
+
+        /* remove outliers by only using 75% of the samples */
+        used = counter * 3 / 4;
+        if (!used)
+                used = counter;
+        if (used) {
+                /* calculate average */
+                s64 off = 0;
+                for (index = 0; index < used; index++)
+                        off += samples[index].offset;
+                *offset = div_s64(off, used);
+        }
+
+        if (samples && samples != buffer)
+                kfree(samples);
+
+        return used;
+}
+EXPORT_SYMBOL(timecompare_offset);
+
+void __timecompare_update(struct timecompare *sync,
+                          u64 source_tstamp)
+{
+        s64 offset;
+        u64 average_time;
+
+        if (!timecompare_offset(sync, &offset, &average_time))
+                return;
+
+        if (!sync->last_update) {
+                sync->last_update = average_time;
+                sync->offset = offset;
+                sync->skew = 0;
+        } else {
+                s64 delta_nsec = average_time - sync->last_update;
+
+                /* avoid division by negative or small deltas */
+                if (delta_nsec >= 10000) {
+                        s64 delta_offset_nsec = offset - sync->offset;
+                        s64 skew; /* delta_offset_nsec *
+                                     TIMECOMPARE_SKEW_RESOLUTION /
+                                     delta_nsec */
+                        u64 divisor;
+
+                        /* div_s64() is limited to 32 bit divisor */
+                        skew = delta_offset_nsec * TIMECOMPARE_SKEW_RESOLUTION;
+                        divisor = delta_nsec;
+                        while (unlikely(divisor >= ((s64)1) << 32)) {
+                                /* divide both by 2; beware, right shift
+                                   of negative value has undefined
+                                   behavior and can only be used for
+                                   the positive divisor */
+                                skew = div_s64(skew, 2);
+                                divisor >>= 1;
+                        }
+                        skew = div_s64(skew, divisor);
+
+                        /*
+                         * Calculate new overall skew as 4/16 the
+                         * old value and 12/16 the new one. This is
+                         * a rather arbitrary tradeoff between
+                         * only using the latest measurement (0/16 and
+                         * 16/16) and even more weight on past measurements.
+                         */
+#define TIMECOMPARE_NEW_SKEW_PER_16 12
+                        sync->skew =
+                                div_s64((16 - TIMECOMPARE_NEW_SKEW_PER_16) *
+                                        sync->skew +
+                                        TIMECOMPARE_NEW_SKEW_PER_16 * skew,
+                                        16);
+                        sync->last_update = average_time;
+                        sync->offset = offset;
+                }
+        }
+}
+EXPORT_SYMBOL(__timecompare_update);
diff --git a/kernel/timer.c b/kernel/timer.c
index ef1c385bc572..b4555568b4e4 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -600,11 +600,14 @@ static struct tvec_base *lock_timer_base(struct timer_list *timer,
         }
 }
 
-int __mod_timer(struct timer_list *timer, unsigned long expires)
+static inline int
+__mod_timer(struct timer_list *timer, unsigned long expires, bool pending_only)
 {
         struct tvec_base *base, *new_base;
         unsigned long flags;
-        int ret = 0;
+        int ret;
+
+        ret = 0;
 
         timer_stats_timer_set_start_info(timer);
         BUG_ON(!timer->function);
@@ -614,6 +617,9 @@ int __mod_timer(struct timer_list *timer, unsigned long expires)
         if (timer_pending(timer)) {
                 detach_timer(timer, 0);
                 ret = 1;
+        } else {
+                if (pending_only)
+                        goto out_unlock;
         }
 
         debug_timer_activate(timer);
@@ -640,42 +646,28 @@ int __mod_timer(struct timer_list *timer, unsigned long expires)
 
         timer->expires = expires;
         internal_add_timer(base, timer);
+
+out_unlock:
         spin_unlock_irqrestore(&base->lock, flags);
 
         return ret;
 }
 
-EXPORT_SYMBOL(__mod_timer);
-
 /**
- * add_timer_on - start a timer on a particular CPU
- * @timer: the timer to be added
- * @cpu: the CPU to start it on
+ * mod_timer_pending - modify a pending timer's timeout
+ * @timer: the pending timer to be modified
+ * @expires: new timeout in jiffies
  *
- * This is not very scalable on SMP. Double adds are not possible.
+ * mod_timer_pending() is the same for pending timers as mod_timer(),
+ * but will not re-activate and modify already deleted timers.
+ *
+ * It is useful for unserialized use of timers.
  */
-void add_timer_on(struct timer_list *timer, int cpu)
+int mod_timer_pending(struct timer_list *timer, unsigned long expires)
 {
-        struct tvec_base *base = per_cpu(tvec_bases, cpu);
-        unsigned long flags;
-
-        timer_stats_timer_set_start_info(timer);
-        BUG_ON(timer_pending(timer) || !timer->function);
-        spin_lock_irqsave(&base->lock, flags);
-        timer_set_base(timer, base);
-        debug_timer_activate(timer);
-        internal_add_timer(base, timer);
-        /*
-         * Check whether the other CPU is idle and needs to be
-         * triggered to reevaluate the timer wheel when nohz is
-         * active. We are protected against the other CPU fiddling
-         * with the timer by holding the timer base lock. This also
-         * makes sure that a CPU on the way to idle can not evaluate
-         * the timer wheel.
-         */
-        wake_up_idle_cpu(cpu);
-        spin_unlock_irqrestore(&base->lock, flags);
+        return __mod_timer(timer, expires, true);
 }
+EXPORT_SYMBOL(mod_timer_pending);
 
 /**
  * mod_timer - modify a timer's timeout
@@ -699,9 +691,6 @@ void add_timer_on(struct timer_list *timer, int cpu)
  */
 int mod_timer(struct timer_list *timer, unsigned long expires)
 {
-        BUG_ON(!timer->function);
-
-        timer_stats_timer_set_start_info(timer);
         /*
          * This is a common optimization triggered by the
          * networking code - if the timer is re-modified
@@ -710,12 +699,62 @@ int mod_timer(struct timer_list *timer, unsigned long expires)
         if (timer->expires == expires && timer_pending(timer))
                 return 1;
 
-        return __mod_timer(timer, expires);
+        return __mod_timer(timer, expires, false);
 }
-
 EXPORT_SYMBOL(mod_timer);
 
 /**
+ * add_timer - start a timer
+ * @timer: the timer to be added
+ *
+ * The kernel will do a ->function(->data) callback from the
+ * timer interrupt at the ->expires point in the future. The
+ * current time is 'jiffies'.
+ *
+ * The timer's ->expires, ->function (and if the handler uses it, ->data)
+ * fields must be set prior calling this function.
+ *
+ * Timers with an ->expires field in the past will be executed in the next
+ * timer tick.
+ */
+void add_timer(struct timer_list *timer)
+{
+        BUG_ON(timer_pending(timer));
+        mod_timer(timer, timer->expires);
+}
+EXPORT_SYMBOL(add_timer);
+
+/**
+ * add_timer_on - start a timer on a particular CPU
+ * @timer: the timer to be added
+ * @cpu: the CPU to start it on
+ *
+ * This is not very scalable on SMP. Double adds are not possible.
+ */
+void add_timer_on(struct timer_list *timer, int cpu)
+{
+        struct tvec_base *base = per_cpu(tvec_bases, cpu);
+        unsigned long flags;
+
+        timer_stats_timer_set_start_info(timer);
+        BUG_ON(timer_pending(timer) || !timer->function);
+        spin_lock_irqsave(&base->lock, flags);
+        timer_set_base(timer, base);
+        debug_timer_activate(timer);
+        internal_add_timer(base, timer);
+        /*
+         * Check whether the other CPU is idle and needs to be
+         * triggered to reevaluate the timer wheel when nohz is
+         * active. We are protected against the other CPU fiddling
+         * with the timer by holding the timer base lock. This also
+         * makes sure that a CPU on the way to idle can not evaluate
+         * the timer wheel.
+         */
+        wake_up_idle_cpu(cpu);
+        spin_unlock_irqrestore(&base->lock, flags);
+}
+
+/**
  * del_timer - deactive a timer.
  * @timer: the timer to be deactivated
  *
@@ -744,7 +783,6 @@ int del_timer(struct timer_list *timer)
 
         return ret;
 }
-
 EXPORT_SYMBOL(del_timer);
 
 #ifdef CONFIG_SMP
@@ -778,7 +816,6 @@ out:
 
         return ret;
 }
-
 EXPORT_SYMBOL(try_to_del_timer_sync);
 
 /**
@@ -816,7 +853,6 @@ int del_timer_sync(struct timer_list *timer)
                 cpu_relax();
         }
 }
-
 EXPORT_SYMBOL(del_timer_sync);
 #endif
 
@@ -1314,7 +1350,7 @@ signed long __sched schedule_timeout(signed long timeout)
         expire = timeout + jiffies;
 
         setup_timer_on_stack(&timer, process_timeout, (unsigned long)current);
-        __mod_timer(&timer, expire);
+        __mod_timer(&timer, expire, false);
         schedule();
         del_singleshot_timer_sync(&timer);
 
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index e2a4ff6fc3a6..2246141bda4d 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -9,6 +9,9 @@ config USER_STACKTRACE_SUPPORT
 config NOP_TRACER
         bool
 
+config HAVE_FTRACE_NMI_ENTER
+        bool
+
 config HAVE_FUNCTION_TRACER
         bool
 
@@ -31,12 +34,20 @@ config HAVE_FTRACE_MCOUNT_RECORD
 config HAVE_HW_BRANCH_TRACER
         bool
 
+config HAVE_FTRACE_SYSCALLS
+        bool
+
 config TRACER_MAX_TRACE
         bool
 
 config RING_BUFFER
         bool
 
+config FTRACE_NMI_ENTER
+       bool
+       depends on HAVE_FTRACE_NMI_ENTER
+       default y
+
 config TRACING
         bool
         select DEBUG_FS
@@ -44,14 +55,31 @@ config TRACING
         select STACKTRACE if STACKTRACE_SUPPORT
         select TRACEPOINTS
         select NOP_TRACER
+        select BINARY_PRINTF
+
+#
+# Minimum requirements an architecture has to meet for us to
+# be able to offer generic tracing facilities:
+#
+config TRACING_SUPPORT
+        bool
+        # PPC32 has no irqflags tracing support, but it can use most of the
+        # tracers anyway, they were tested to build and work. Note that new
+        # exceptions to this list aren't welcomed, better implement the
+        # irqflags tracing for your architecture.
+        depends on TRACE_IRQFLAGS_SUPPORT || PPC32
+        depends on STACKTRACE_SUPPORT
+        default y
+
+if TRACING_SUPPORT
 
 menu "Tracers"
 
 config FUNCTION_TRACER
         bool "Kernel Function Tracer"
         depends on HAVE_FUNCTION_TRACER
-        depends on DEBUG_KERNEL
         select FRAME_POINTER
+        select KALLSYMS
         select TRACING
         select CONTEXT_SWITCH_TRACER
         help
@@ -71,18 +99,16 @@ config FUNCTION_GRAPH_TRACER
         help
           Enable the kernel to trace a function at both its return
           and its entry.
-          It's first purpose is to trace the duration of functions and
-          draw a call graph for each thread with some informations like
-          the return value.
-          This is done by setting the current return address on the current
-          task structure into a stack of calls.
+          Its first purpose is to trace the duration of functions and
+          draw a call graph for each thread with some information like
+          the return value. This is done by setting the current return 
+          address on the current task structure into a stack of calls.
 
 config IRQSOFF_TRACER
         bool "Interrupts-off Latency Tracer"
         default n
         depends on TRACE_IRQFLAGS_SUPPORT
         depends on GENERIC_TIME
-        depends on DEBUG_KERNEL
         select TRACE_IRQFLAGS
         select TRACING
         select TRACER_MAX_TRACE
@@ -105,7 +131,6 @@ config PREEMPT_TRACER
         default n
         depends on GENERIC_TIME
         depends on PREEMPT
-        depends on DEBUG_KERNEL
         select TRACING
         select TRACER_MAX_TRACE
         help
@@ -126,13 +151,13 @@ config SYSPROF_TRACER
         bool "Sysprof Tracer"
         depends on X86
         select TRACING
+        select CONTEXT_SWITCH_TRACER
         help
           This tracer provides the trace needed by the 'Sysprof' userspace
           tool.
 
 config SCHED_TRACER
         bool "Scheduling Latency Tracer"
-        depends on DEBUG_KERNEL
         select TRACING
         select CONTEXT_SWITCH_TRACER
         select TRACER_MAX_TRACE
@@ -142,16 +167,30 @@ config SCHED_TRACER
 
 config CONTEXT_SWITCH_TRACER
         bool "Trace process context switches"
-        depends on DEBUG_KERNEL
         select TRACING
         select MARKERS
         help
           This tracer gets called from the context switch and records
           all switching of tasks.
 
+config EVENT_TRACER
+        bool "Trace various events in the kernel"
+        select TRACING
+        help
+          This tracer hooks to various trace points in the kernel
+          allowing the user to pick and choose which trace point they
+          want to trace.
+
+config FTRACE_SYSCALLS
+        bool "Trace syscalls"
+        depends on HAVE_FTRACE_SYSCALLS
+        select TRACING
+        select KALLSYMS
+        help
+          Basic tracer to catch the syscall entry and exit events.
+
 config BOOT_TRACER
         bool "Trace boot initcalls"
-        depends on DEBUG_KERNEL
         select TRACING
         select CONTEXT_SWITCH_TRACER
         help
@@ -164,13 +203,11 @@ config BOOT_TRACER
           representation of the delays during initcalls - but the raw
           /debug/tracing/trace text output is readable too.
 
-          ( Note that tracing self tests can't be enabled if this tracer is
-            selected, because the self-tests are an initcall as well and that
-            would invalidate the boot trace. )
+          You must pass in ftrace=initcall to the kernel command line
+          to enable this on bootup.
 
 config TRACE_BRANCH_PROFILING
         bool "Trace likely/unlikely profiler"
-        depends on DEBUG_KERNEL
         select TRACING
         help
           This tracer profiles all the the likely and unlikely macros
@@ -223,7 +260,6 @@ config BRANCH_TRACER
 
 config POWER_TRACER
         bool "Trace power consumption behavior"
-        depends on DEBUG_KERNEL
         depends on X86
         select TRACING
         help
@@ -235,9 +271,9 @@ config POWER_TRACER
 config STACK_TRACER
         bool "Trace max stack"
         depends on HAVE_FUNCTION_TRACER
-        depends on DEBUG_KERNEL
         select FUNCTION_TRACER
         select STACKTRACE
+        select KALLSYMS
         help
           This special tracer records the maximum stack footprint of the
           kernel and displays it in debugfs/tracing/stack_trace.
@@ -264,11 +300,66 @@ config HW_BRANCH_TRACER
           This tracer records all branches on the system in a circular
           buffer giving access to the last N branches for each cpu.
 
+config KMEMTRACE
+        bool "Trace SLAB allocations"
+        select TRACING
+        help
+          kmemtrace provides tracing for slab allocator functions, such as
+          kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected
+          data is then fed to the userspace application in order to analyse
+          allocation hotspots, internal fragmentation and so on, making it
+          possible to see how well an allocator performs, as well as debug
+          and profile kernel code.
+
+          This requires an userspace application to use. See
+          Documentation/vm/kmemtrace.txt for more information.
+
+          Saying Y will make the kernel somewhat larger and slower. However,
+          if you disable kmemtrace at run-time or boot-time, the performance
+          impact is minimal (depending on the arch the kernel is built for).
+
+          If unsure, say N.
+
+config WORKQUEUE_TRACER
+        bool "Trace workqueues"
+        select TRACING
+        help
+          The workqueue tracer provides some statistical informations
+          about each cpu workqueue thread such as the number of the
+          works inserted and executed since their creation. It can help
+          to evaluate the amount of work each of them have to perform.
+          For example it can help a developer to decide whether he should
+          choose a per cpu workqueue instead of a singlethreaded one.
+
+config BLK_DEV_IO_TRACE
+        bool "Support for tracing block io actions"
+        depends on SYSFS
+        depends on BLOCK
+        select RELAY
+        select DEBUG_FS
+        select TRACEPOINTS
+        select TRACING
+        select STACKTRACE
+        help
+          Say Y here if you want to be able to trace the block layer actions
+          on a given queue. Tracing allows you to see any traffic happening
+          on a block device queue. For more information (and the userspace
+          support tools needed), fetch the blktrace tools from:
+
+          git://git.kernel.dk/blktrace.git
+
+          Tracing also is possible using the ftrace interface, e.g.:
+
+            echo 1 > /sys/block/sda/sda1/trace/enable
+            echo blk > /sys/kernel/debug/tracing/current_tracer
+            cat /sys/kernel/debug/tracing/trace_pipe
+
+          If unsure, say N.
+
 config DYNAMIC_FTRACE
         bool "enable/disable ftrace tracepoints dynamically"
         depends on FUNCTION_TRACER
         depends on HAVE_DYNAMIC_FTRACE
-        depends on DEBUG_KERNEL
         default y
         help
          This option will modify all the calls to ftrace dynamically
@@ -294,7 +385,7 @@ config FTRACE_SELFTEST
 
 config FTRACE_STARTUP_TEST
         bool "Perform a startup test on ftrace"
-        depends on TRACING && DEBUG_KERNEL && !BOOT_TRACER
+        depends on TRACING
         select FTRACE_SELFTEST
         help
           This option performs a series of startup tests on ftrace. On bootup
@@ -302,4 +393,30 @@ config FTRACE_STARTUP_TEST
           functioning properly. It will do tests on all the configured
           tracers of ftrace.
 
+config MMIOTRACE
+        bool "Memory mapped IO tracing"
+        depends on HAVE_MMIOTRACE_SUPPORT && PCI
+        select TRACING
+        help
+          Mmiotrace traces Memory Mapped I/O access and is meant for
+          debugging and reverse engineering. It is called from the ioremap
+          implementation and works via page faults. Tracing is disabled by
+          default and can be enabled at run-time.
+
+          See Documentation/tracers/mmiotrace.txt.
+          If you are not helping to develop drivers, say N.
+
+config MMIOTRACE_TEST
+        tristate "Test module for mmiotrace"
+        depends on MMIOTRACE && m
+        help
+          This is a dumb module for testing mmiotrace. It is very dangerous
+          as it will write garbage to IO memory starting at a given address.
+          However, it should be safe to use on e.g. unused portion of VRAM.
+
+          Say N, unless you absolutely know what you are doing.
+
 endmenu
+
+endif # TRACING_SUPPORT
+
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 349d5a93653f..2630f5121ec1 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -19,6 +19,10 @@ obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o
 obj-$(CONFIG_RING_BUFFER) += ring_buffer.o
 
 obj-$(CONFIG_TRACING) += trace.o
+obj-$(CONFIG_TRACING) += trace_clock.o
+obj-$(CONFIG_TRACING) += trace_output.o
+obj-$(CONFIG_TRACING) += trace_stat.o
+obj-$(CONFIG_TRACING) += trace_printk.o
 obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
 obj-$(CONFIG_SYSPROF_TRACER) += trace_sysprof.o
 obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
@@ -33,5 +37,14 @@ obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
 obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
 obj-$(CONFIG_HW_BRANCH_TRACER) += trace_hw_branches.o
 obj-$(CONFIG_POWER_TRACER) += trace_power.o
+obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
+obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
+obj-$(CONFIG_BLK_DEV_IO_TRACE)  += blktrace.o
+obj-$(CONFIG_EVENT_TRACER) += trace_events.o
+obj-$(CONFIG_EVENT_TRACER) += events.o
+obj-$(CONFIG_EVENT_TRACER) += trace_export.o
+obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o
+obj-$(CONFIG_EVENT_PROFILE) += trace_event_profile.o
+obj-$(CONFIG_EVENT_TRACER) += trace_events_filter.o
 
 libftrace-y := ftrace.o
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
new file mode 100644
index 000000000000..b32ff446c3fb
--- /dev/null
+++ b/kernel/trace/blktrace.c
@@ -0,0 +1,1550 @@
+/*
+ * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/blkdev.h>
+#include <linux/blktrace_api.h>
+#include <linux/percpu.h>
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/debugfs.h>
+#include <linux/time.h>
+#include <trace/block.h>
+#include <linux/uaccess.h>
+#include "trace_output.h"
+
+static unsigned int blktrace_seq __read_mostly = 1;
+
+static struct trace_array *blk_tr;
+static bool blk_tracer_enabled __read_mostly;
+
+/* Select an alternative, minimalistic output than the original one */
+#define TRACE_BLK_OPT_CLASSIC   0x1
+
+static struct tracer_opt blk_tracer_opts[] = {
+        /* Default disable the minimalistic output */
+        { TRACER_OPT(blk_classic, TRACE_BLK_OPT_CLASSIC) },
+        { }
+};
+
+static struct tracer_flags blk_tracer_flags = {
+        .val  = 0,
+        .opts = blk_tracer_opts,
+};
+
+/* Global reference count of probes */
+static atomic_t blk_probes_ref = ATOMIC_INIT(0);
+
+static void blk_register_tracepoints(void);
+static void blk_unregister_tracepoints(void);
+
+/*
+ * Send out a notify message.
+ */
+static void trace_note(struct blk_trace *bt, pid_t pid, int action,
+                       const void *data, size_t len)
+{
+        struct blk_io_trace *t;
+        struct ring_buffer_event *event = NULL;
+        int pc = 0;
+        int cpu = smp_processor_id();
+        bool blk_tracer = blk_tracer_enabled;
+
+        if (blk_tracer) {
+                pc = preempt_count();
+                event = trace_buffer_lock_reserve(blk_tr, TRACE_BLK,
+                                                  sizeof(*t) + len,
+                                                  0, pc);
+                if (!event)
+                        return;
+                t = ring_buffer_event_data(event);
+                goto record_it;
+        }
+
+        if (!bt->rchan)
+                return;
+
+        t = relay_reserve(bt->rchan, sizeof(*t) + len);
+        if (t) {
+                t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
+                t->time = ktime_to_ns(ktime_get());
+record_it:
+                t->device = bt->dev;
+                t->action = action;
+                t->pid = pid;
+                t->cpu = cpu;
+                t->pdu_len = len;
+                memcpy((void *) t + sizeof(*t), data, len);
+
+                if (blk_tracer)
+                        trace_buffer_unlock_commit(blk_tr, event, 0, pc);
+        }
+}
+
+/*
+ * Send out a notify for this process, if we haven't done so since a trace
+ * started
+ */
+static void trace_note_tsk(struct blk_trace *bt, struct task_struct *tsk)
+{
+        tsk->btrace_seq = blktrace_seq;
+        trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm, sizeof(tsk->comm));
+}
+
+static void trace_note_time(struct blk_trace *bt)
+{
+        struct timespec now;
+        unsigned long flags;
+        u32 words[2];
+
+        getnstimeofday(&now);
+        words[0] = now.tv_sec;
+        words[1] = now.tv_nsec;
+
+        local_irq_save(flags);
+        trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words));
+        local_irq_restore(flags);
+}
+
+void __trace_note_message(struct blk_trace *bt, const char *fmt, ...)
+{
+        int n;
+        va_list args;
+        unsigned long flags;
+        char *buf;
+
+        if (unlikely(bt->trace_state != Blktrace_running &&
+                     !blk_tracer_enabled))
+                return;
+
+        local_irq_save(flags);
+        buf = per_cpu_ptr(bt->msg_data, smp_processor_id());
+        va_start(args, fmt);
+        n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args);
+        va_end(args);
+
+        trace_note(bt, 0, BLK_TN_MESSAGE, buf, n);
+        local_irq_restore(flags);
+}
+EXPORT_SYMBOL_GPL(__trace_note_message);
+
+static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
+                         pid_t pid)
+{
+        if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0)
+                return 1;
+        if (sector < bt->start_lba || sector > bt->end_lba)
+                return 1;
+        if (bt->pid && pid != bt->pid)
+                return 1;
+
+        return 0;
+}
+
+/*
+ * Data direction bit lookup
+ */
+static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ),
+                                 BLK_TC_ACT(BLK_TC_WRITE) };
+
+/* The ilog2() calls fall out because they're constant */
+#define MASK_TC_BIT(rw, __name) ((rw & (1 << BIO_RW_ ## __name)) << \
+          (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - BIO_RW_ ## __name))
+
+/*
+ * The worker for the various blk_add_trace*() types. Fills out a
+ * blk_io_trace structure and places it in a per-cpu subbuffer.
+ */
+static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
+                     int rw, u32 what, int error, int pdu_len, void *pdu_data)
+{
+        struct task_struct *tsk = current;
+        struct ring_buffer_event *event = NULL;
+        struct blk_io_trace *t;
+        unsigned long flags = 0;
+        unsigned long *sequence;
+        pid_t pid;
+        int cpu, pc = 0;
+        bool blk_tracer = blk_tracer_enabled;
+
+        if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer))
+                return;
+
+        what |= ddir_act[rw & WRITE];
+        what |= MASK_TC_BIT(rw, BARRIER);
+        what |= MASK_TC_BIT(rw, SYNCIO);
+        what |= MASK_TC_BIT(rw, AHEAD);
+        what |= MASK_TC_BIT(rw, META);
+        what |= MASK_TC_BIT(rw, DISCARD);
+
+        pid = tsk->pid;
+        if (unlikely(act_log_check(bt, what, sector, pid)))
+                return;
+        cpu = raw_smp_processor_id();
+
+        if (blk_tracer) {
+                tracing_record_cmdline(current);
+
+                pc = preempt_count();
+                event = trace_buffer_lock_reserve(blk_tr, TRACE_BLK,
+                                                  sizeof(*t) + pdu_len,
+                                                  0, pc);
+                if (!event)
+                        return;
+                t = ring_buffer_event_data(event);
+                goto record_it;
+        }
+
+        /*
+         * A word about the locking here - we disable interrupts to reserve
+         * some space in the relay per-cpu buffer, to prevent an irq
+         * from coming in and stepping on our toes.
+         */
+        local_irq_save(flags);
+
+        if (unlikely(tsk->btrace_seq != blktrace_seq))
+                trace_note_tsk(bt, tsk);
+
+        t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len);
+        if (t) {
+                sequence = per_cpu_ptr(bt->sequence, cpu);
+
+                t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
+                t->sequence = ++(*sequence);
+                t->time = ktime_to_ns(ktime_get());
+record_it:
+                /*
+                 * These two are not needed in ftrace as they are in the
+                 * generic trace_entry, filled by tracing_generic_entry_update,
+                 * but for the trace_event->bin() synthesizer benefit we do it
+                 * here too.
+                 */
+                t->cpu = cpu;
+                t->pid = pid;
+
+                t->sector = sector;
+                t->bytes = bytes;
+                t->action = what;
+                t->device = bt->dev;
+                t->error = error;
+                t->pdu_len = pdu_len;
+
+                if (pdu_len)
+                        memcpy((void *) t + sizeof(*t), pdu_data, pdu_len);
+
+                if (blk_tracer) {
+                        trace_buffer_unlock_commit(blk_tr, event, 0, pc);
+                        return;
+                }
+        }
+
+        local_irq_restore(flags);
+}
+
+static struct dentry *blk_tree_root;
+static DEFINE_MUTEX(blk_tree_mutex);
+
+static void blk_trace_free(struct blk_trace *bt)
+{
+        debugfs_remove(bt->msg_file);
+        debugfs_remove(bt->dropped_file);
+        relay_close(bt->rchan);
+        free_percpu(bt->sequence);
+        free_percpu(bt->msg_data);
+        kfree(bt);
+}
+
+static void blk_trace_cleanup(struct blk_trace *bt)
+{
+        blk_trace_free(bt);
+        if (atomic_dec_and_test(&blk_probes_ref))
+                blk_unregister_tracepoints();
+}
+
+int blk_trace_remove(struct request_queue *q)
+{
+        struct blk_trace *bt;
+
+        bt = xchg(&q->blk_trace, NULL);
+        if (!bt)
+                return -EINVAL;
+
+        if (bt->trace_state != Blktrace_running)
+                blk_trace_cleanup(bt);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(blk_trace_remove);
+
+static int blk_dropped_open(struct inode *inode, struct file *filp)
+{
+        filp->private_data = inode->i_private;
+
+        return 0;
+}
+
+static ssize_t blk_dropped_read(struct file *filp, char __user *buffer,
+                                size_t count, loff_t *ppos)
+{
+        struct blk_trace *bt = filp->private_data;
+        char buf[16];
+
+        snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped));
+
+        return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
+}
+
+static const struct file_operations blk_dropped_fops = {
+        .owner =        THIS_MODULE,
+        .open =         blk_dropped_open,
+        .read =         blk_dropped_read,
+};
+
+static int blk_msg_open(struct inode *inode, struct file *filp)
+{
+        filp->private_data = inode->i_private;
+
+        return 0;
+}
+
+static ssize_t blk_msg_write(struct file *filp, const char __user *buffer,
+                                size_t count, loff_t *ppos)
+{
+        char *msg;
+        struct blk_trace *bt;
+
+        if (count >= BLK_TN_MAX_MSG)
+                return -EINVAL;
+
+        msg = kmalloc(count + 1, GFP_KERNEL);
+        if (msg == NULL)
+                return -ENOMEM;
+
+        if (copy_from_user(msg, buffer, count)) {
+                kfree(msg);
+                return -EFAULT;
+        }
+
+        msg[count] = '\0';
+        bt = filp->private_data;
+        __trace_note_message(bt, "%s", msg);
+        kfree(msg);
+
+        return count;
+}
+
+static const struct file_operations blk_msg_fops = {
+        .owner =        THIS_MODULE,
+        .open =         blk_msg_open,
+        .write =        blk_msg_write,
+};
+
+/*
+ * Keep track of how many times we encountered a full subbuffer, to aid
+ * the user space app in telling how many lost events there were.
+ */
+static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf,
+                                     void *prev_subbuf, size_t prev_padding)
+{
+        struct blk_trace *bt;
+
+        if (!relay_buf_full(buf))
+                return 1;
+
+        bt = buf->chan->private_data;
+        atomic_inc(&bt->dropped);
+        return 0;
+}
+
+static int blk_remove_buf_file_callback(struct dentry *dentry)
+{
+        struct dentry *parent = dentry->d_parent;
+        debugfs_remove(dentry);
+
+        /*
+        * this will fail for all but the last file, but that is ok. what we
+        * care about is the top level buts->name directory going away, when
+        * the last trace file is gone. Then we don't have to rmdir() that
+        * manually on trace stop, so it nicely solves the issue with
+        * force killing of running traces.
+        */
+
+        debugfs_remove(parent);
+        return 0;
+}
+
+static struct dentry *blk_create_buf_file_callback(const char *filename,
+                                                   struct dentry *parent,
+                                                   int mode,
+                                                   struct rchan_buf *buf,
+                                                   int *is_global)
+{
+        return debugfs_create_file(filename, mode, parent, buf,
+                                        &relay_file_operations);
+}
+
+static struct rchan_callbacks blk_relay_callbacks = {
+        .subbuf_start           = blk_subbuf_start_callback,
+        .create_buf_file        = blk_create_buf_file_callback,
+        .remove_buf_file        = blk_remove_buf_file_callback,
+};
+
+/*
+ * Setup everything required to start tracing
+ */
+int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
+                        struct blk_user_trace_setup *buts)
+{
+        struct blk_trace *old_bt, *bt = NULL;
+        struct dentry *dir = NULL;
+        int ret, i;
+
+        if (!buts->buf_size || !buts->buf_nr)
+                return -EINVAL;
+
+        strncpy(buts->name, name, BLKTRACE_BDEV_SIZE);
+        buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0';
+
+        /*
+         * some device names have larger paths - convert the slashes
+         * to underscores for this to work as expected
+         */
+        for (i = 0; i < strlen(buts->name); i++)
+                if (buts->name[i] == '/')
+                        buts->name[i] = '_';
+
+        bt = kzalloc(sizeof(*bt), GFP_KERNEL);
+        if (!bt)
+                return -ENOMEM;
+
+        ret = -ENOMEM;
+        bt->sequence = alloc_percpu(unsigned long);
+        if (!bt->sequence)
+                goto err;
+
+        bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char));
+        if (!bt->msg_data)
+                goto err;
+
+        ret = -ENOENT;
+
+        mutex_lock(&blk_tree_mutex);
+        if (!blk_tree_root) {
+                blk_tree_root = debugfs_create_dir("block", NULL);
+                if (!blk_tree_root) {
+                        mutex_unlock(&blk_tree_mutex);
+                        goto err;
+                }
+        }
+        mutex_unlock(&blk_tree_mutex);
+
+        dir = debugfs_create_dir(buts->name, blk_tree_root);
+
+        if (!dir)
+                goto err;
+
+        bt->dir = dir;
+        bt->dev = dev;
+        atomic_set(&bt->dropped, 0);
+
+        ret = -EIO;
+        bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt,
+                                               &blk_dropped_fops);
+        if (!bt->dropped_file)
+                goto err;
+
+        bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops);
+        if (!bt->msg_file)
+                goto err;
+
+        bt->rchan = relay_open("trace", dir, buts->buf_size,
+                                buts->buf_nr, &blk_relay_callbacks, bt);
+        if (!bt->rchan)
+                goto err;
+
+        bt->act_mask = buts->act_mask;
+        if (!bt->act_mask)
+                bt->act_mask = (u16) -1;
+
+        bt->start_lba = buts->start_lba;
+        bt->end_lba = buts->end_lba;
+        if (!bt->end_lba)
+                bt->end_lba = -1ULL;
+
+        bt->pid = buts->pid;
+        bt->trace_state = Blktrace_setup;
+
+        ret = -EBUSY;
+        old_bt = xchg(&q->blk_trace, bt);
+        if (old_bt) {
+                (void) xchg(&q->blk_trace, old_bt);
+                goto err;
+        }
+
+        if (atomic_inc_return(&blk_probes_ref) == 1)
+                blk_register_tracepoints();
+
+        return 0;
+err:
+        blk_trace_free(bt);
+        return ret;
+}
+
+int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
+                    char __user *arg)
+{
+        struct blk_user_trace_setup buts;
+        int ret;
+
+        ret = copy_from_user(&buts, arg, sizeof(buts));
+        if (ret)
+                return -EFAULT;
+
+        ret = do_blk_trace_setup(q, name, dev, &buts);
+        if (ret)
+                return ret;
+
+        if (copy_to_user(arg, &buts, sizeof(buts)))
+                return -EFAULT;
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(blk_trace_setup);
+
+int blk_trace_startstop(struct request_queue *q, int start)
+{
+        int ret;
+        struct blk_trace *bt = q->blk_trace;
+
+        if (bt == NULL)
+                return -EINVAL;
+
+        /*
+         * For starting a trace, we can transition from a setup or stopped
+         * trace. For stopping a trace, the state must be running
+         */
+        ret = -EINVAL;
+        if (start) {
+                if (bt->trace_state == Blktrace_setup ||
+                    bt->trace_state == Blktrace_stopped) {
+                        blktrace_seq++;
+                        smp_mb();
+                        bt->trace_state = Blktrace_running;
+
+                        trace_note_time(bt);
+                        ret = 0;
+                }
+        } else {
+                if (bt->trace_state == Blktrace_running) {
+                        bt->trace_state = Blktrace_stopped;
+                        relay_flush(bt->rchan);
+                        ret = 0;
+                }
+        }
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(blk_trace_startstop);
+
+/**
+ * blk_trace_ioctl: - handle the ioctls associated with tracing
+ * @bdev:       the block device
+ * @cmd:        the ioctl cmd
+ * @arg:        the argument data, if any
+ *
+ **/
+int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
+{
+        struct request_queue *q;
+        int ret, start = 0;
+        char b[BDEVNAME_SIZE];
+
+        q = bdev_get_queue(bdev);
+        if (!q)
+                return -ENXIO;
+
+        mutex_lock(&bdev->bd_mutex);
+
+        switch (cmd) {
+        case BLKTRACESETUP:
+                bdevname(bdev, b);
+                ret = blk_trace_setup(q, b, bdev->bd_dev, arg);
+                break;
+        case BLKTRACESTART:
+                start = 1;
+        case BLKTRACESTOP:
+                ret = blk_trace_startstop(q, start);
+                break;
+        case BLKTRACETEARDOWN:
+                ret = blk_trace_remove(q);
+                break;
+        default:
+                ret = -ENOTTY;
+                break;
+        }
+
+        mutex_unlock(&bdev->bd_mutex);
+        return ret;
+}
+
+/**
+ * blk_trace_shutdown: - stop and cleanup trace structures
+ * @q:    the request queue associated with the device
+ *
+ **/
+void blk_trace_shutdown(struct request_queue *q)
+{
+        if (q->blk_trace) {
+                blk_trace_startstop(q, 0);
+                blk_trace_remove(q);
+        }
+}
+
+/*
+ * blktrace probes
+ */
+
+/**
+ * blk_add_trace_rq - Add a trace for a request oriented action
+ * @q:          queue the io is for
+ * @rq:         the source request
+ * @what:       the action
+ *
+ * Description:
+ *     Records an action against a request. Will log the bio offset + size.
+ *
+ **/
+static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
+                                    u32 what)
+{
+        struct blk_trace *bt = q->blk_trace;
+        int rw = rq->cmd_flags & 0x03;
+
+        if (likely(!bt))
+                return;
+
+        if (blk_discard_rq(rq))
+                rw |= (1 << BIO_RW_DISCARD);
+
+        if (blk_pc_request(rq)) {
+                what |= BLK_TC_ACT(BLK_TC_PC);
+                __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors,
+                                rq->cmd_len, rq->cmd);
+        } else  {
+                what |= BLK_TC_ACT(BLK_TC_FS);
+                __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
+                                rw, what, rq->errors, 0, NULL);
+        }
+}
+
+static void blk_add_trace_rq_abort(struct request_queue *q, struct request *rq)
+{
+        blk_add_trace_rq(q, rq, BLK_TA_ABORT);
+}
+
+static void blk_add_trace_rq_insert(struct request_queue *q, struct request *rq)
+{
+        blk_add_trace_rq(q, rq, BLK_TA_INSERT);
+}
+
+static void blk_add_trace_rq_issue(struct request_queue *q, struct request *rq)
+{
+        blk_add_trace_rq(q, rq, BLK_TA_ISSUE);
+}
+
+static void blk_add_trace_rq_requeue(struct request_queue *q,
+                                     struct request *rq)
+{
+        blk_add_trace_rq(q, rq, BLK_TA_REQUEUE);
+}
+
+static void blk_add_trace_rq_complete(struct request_queue *q,
+                                      struct request *rq)
+{
+        blk_add_trace_rq(q, rq, BLK_TA_COMPLETE);
+}
+
+/**
+ * blk_add_trace_bio - Add a trace for a bio oriented action
+ * @q:          queue the io is for
+ * @bio:        the source bio
+ * @what:       the action
+ *
+ * Description:
+ *     Records an action against a bio. Will log the bio offset + size.
+ *
+ **/
+static void blk_add_trace_bio(struct request_queue *q, struct bio *bio,
+                                     u32 what)
+{
+        struct blk_trace *bt = q->blk_trace;
+
+        if (likely(!bt))
+                return;
+
+        __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what,
+                        !bio_flagged(bio, BIO_UPTODATE), 0, NULL);
+}
+
+static void blk_add_trace_bio_bounce(struct request_queue *q, struct bio *bio)
+{
+        blk_add_trace_bio(q, bio, BLK_TA_BOUNCE);
+}
+
+static void blk_add_trace_bio_complete(struct request_queue *q, struct bio *bio)
+{
+        blk_add_trace_bio(q, bio, BLK_TA_COMPLETE);
+}
+
+static void blk_add_trace_bio_backmerge(struct request_queue *q,
+                                        struct bio *bio)
+{
+        blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE);
+}
+
+static void blk_add_trace_bio_frontmerge(struct request_queue *q,
+                                         struct bio *bio)
+{
+        blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE);
+}
+
+static void blk_add_trace_bio_queue(struct request_queue *q, struct bio *bio)
+{
+        blk_add_trace_bio(q, bio, BLK_TA_QUEUE);
+}
+
+static void blk_add_trace_getrq(struct request_queue *q,
+                                struct bio *bio, int rw)
+{
+        if (bio)
+                blk_add_trace_bio(q, bio, BLK_TA_GETRQ);
+        else {
+                struct blk_trace *bt = q->blk_trace;
+
+                if (bt)
+                        __blk_add_trace(bt, 0, 0, rw, BLK_TA_GETRQ, 0, 0, NULL);
+        }
+}
+
+
+static void blk_add_trace_sleeprq(struct request_queue *q,
+                                  struct bio *bio, int rw)
+{
+        if (bio)
+                blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ);
+        else {
+                struct blk_trace *bt = q->blk_trace;
+
+                if (bt)
+                        __blk_add_trace(bt, 0, 0, rw, BLK_TA_SLEEPRQ,
+                                        0, 0, NULL);
+        }
+}
+
+static void blk_add_trace_plug(struct request_queue *q)
+{
+        struct blk_trace *bt = q->blk_trace;
+
+        if (bt)
+                __blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL);
+}
+
+static void blk_add_trace_unplug_io(struct request_queue *q)
+{
+        struct blk_trace *bt = q->blk_trace;
+
+        if (bt) {
+                unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE];
+                __be64 rpdu = cpu_to_be64(pdu);
+
+                __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_IO, 0,
+                                sizeof(rpdu), &rpdu);
+        }
+}
+
+static void blk_add_trace_unplug_timer(struct request_queue *q)
+{
+        struct blk_trace *bt = q->blk_trace;
+
+        if (bt) {
+                unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE];
+                __be64 rpdu = cpu_to_be64(pdu);
+
+                __blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_TIMER, 0,
+                                sizeof(rpdu), &rpdu);
+        }
+}
+
+static void blk_add_trace_split(struct request_queue *q, struct bio *bio,
+                                unsigned int pdu)
+{
+        struct blk_trace *bt = q->blk_trace;
+
+        if (bt) {
+                __be64 rpdu = cpu_to_be64(pdu);
+
+                __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw,
+                                BLK_TA_SPLIT, !bio_flagged(bio, BIO_UPTODATE),
+                                sizeof(rpdu), &rpdu);
+        }
+}
+
+/**
+ * blk_add_trace_remap - Add a trace for a remap operation
+ * @q:          queue the io is for
+ * @bio:        the source bio
+ * @dev:        target device
+ * @from:       source sector
+ * @to:         target sector
+ *
+ * Description:
+ *     Device mapper or raid target sometimes need to split a bio because
+ *     it spans a stripe (or similar). Add a trace for that action.
+ *
+ **/
+static void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
+                                       dev_t dev, sector_t from, sector_t to)
+{
+        struct blk_trace *bt = q->blk_trace;
+        struct blk_io_trace_remap r;
+
+        if (likely(!bt))
+                return;
+
+        r.device = cpu_to_be32(dev);
+        r.device_from = cpu_to_be32(bio->bi_bdev->bd_dev);
+        r.sector = cpu_to_be64(to);
+
+        __blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP,
+                        !bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r);
+}
+
+/**
+ * blk_add_driver_data - Add binary message with driver-specific data
+ * @q:          queue the io is for
+ * @rq:         io request
+ * @data:       driver-specific data
+ * @len:        length of driver-specific data
+ *
+ * Description:
+ *     Some drivers might want to write driver-specific data per request.
+ *
+ **/
+void blk_add_driver_data(struct request_queue *q,
+                         struct request *rq,
+                         void *data, size_t len)
+{
+        struct blk_trace *bt = q->blk_trace;
+
+        if (likely(!bt))
+                return;
+
+        if (blk_pc_request(rq))
+                __blk_add_trace(bt, 0, rq->data_len, 0, BLK_TA_DRV_DATA,
+                                rq->errors, len, data);
+        else
+                __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
+                                0, BLK_TA_DRV_DATA, rq->errors, len, data);
+}
+EXPORT_SYMBOL_GPL(blk_add_driver_data);
+
+static void blk_register_tracepoints(void)
+{
+        int ret;
+
+        ret = register_trace_block_rq_abort(blk_add_trace_rq_abort);
+        WARN_ON(ret);
+        ret = register_trace_block_rq_insert(blk_add_trace_rq_insert);
+        WARN_ON(ret);
+        ret = register_trace_block_rq_issue(blk_add_trace_rq_issue);
+        WARN_ON(ret);
+        ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue);
+        WARN_ON(ret);
+        ret = register_trace_block_rq_complete(blk_add_trace_rq_complete);
+        WARN_ON(ret);
+        ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce);
+        WARN_ON(ret);
+        ret = register_trace_block_bio_complete(blk_add_trace_bio_complete);
+        WARN_ON(ret);
+        ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge);
+        WARN_ON(ret);
+        ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge);
+        WARN_ON(ret);
+        ret = register_trace_block_bio_queue(blk_add_trace_bio_queue);
+        WARN_ON(ret);
+        ret = register_trace_block_getrq(blk_add_trace_getrq);
+        WARN_ON(ret);
+        ret = register_trace_block_sleeprq(blk_add_trace_sleeprq);
+        WARN_ON(ret);
+        ret = register_trace_block_plug(blk_add_trace_plug);
+        WARN_ON(ret);
+        ret = register_trace_block_unplug_timer(blk_add_trace_unplug_timer);
+        WARN_ON(ret);
+        ret = register_trace_block_unplug_io(blk_add_trace_unplug_io);
+        WARN_ON(ret);
+        ret = register_trace_block_split(blk_add_trace_split);
+        WARN_ON(ret);
+        ret = register_trace_block_remap(blk_add_trace_remap);
+        WARN_ON(ret);
+}
+
+static void blk_unregister_tracepoints(void)
+{
+        unregister_trace_block_remap(blk_add_trace_remap);
+        unregister_trace_block_split(blk_add_trace_split);
+        unregister_trace_block_unplug_io(blk_add_trace_unplug_io);
+        unregister_trace_block_unplug_timer(blk_add_trace_unplug_timer);
+        unregister_trace_block_plug(blk_add_trace_plug);
+        unregister_trace_block_sleeprq(blk_add_trace_sleeprq);
+        unregister_trace_block_getrq(blk_add_trace_getrq);
+        unregister_trace_block_bio_queue(blk_add_trace_bio_queue);
+        unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge);
+        unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge);
+        unregister_trace_block_bio_complete(blk_add_trace_bio_complete);
+        unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce);
+        unregister_trace_block_rq_complete(blk_add_trace_rq_complete);
+        unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue);
+        unregister_trace_block_rq_issue(blk_add_trace_rq_issue);
+        unregister_trace_block_rq_insert(blk_add_trace_rq_insert);
+        unregister_trace_block_rq_abort(blk_add_trace_rq_abort);
+
+        tracepoint_synchronize_unregister();
+}
+
+/*
+ * struct blk_io_tracer formatting routines
+ */
+
+static void fill_rwbs(char *rwbs, const struct blk_io_trace *t)
+{
+        int i = 0;
+        int tc = t->action >> BLK_TC_SHIFT;
+
+        if (t->action == BLK_TN_MESSAGE) {
+                rwbs[i++] = 'N';
+                goto out;
+        }
+
+        if (tc & BLK_TC_DISCARD)
+                rwbs[i++] = 'D';
+        else if (tc & BLK_TC_WRITE)
+                rwbs[i++] = 'W';
+        else if (t->bytes)
+                rwbs[i++] = 'R';
+        else
+                rwbs[i++] = 'N';
+
+        if (tc & BLK_TC_AHEAD)
+                rwbs[i++] = 'A';
+        if (tc & BLK_TC_BARRIER)
+                rwbs[i++] = 'B';
+        if (tc & BLK_TC_SYNC)
+                rwbs[i++] = 'S';
+        if (tc & BLK_TC_META)
+                rwbs[i++] = 'M';
+out:
+        rwbs[i] = '\0';
+}
+
+static inline
+const struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent)
+{
+        return (const struct blk_io_trace *)ent;
+}
+
+static inline const void *pdu_start(const struct trace_entry *ent)
+{
+        return te_blk_io_trace(ent) + 1;
+}
+
+static inline u32 t_sec(const struct trace_entry *ent)
+{
+        return te_blk_io_trace(ent)->bytes >> 9;
+}
+
+static inline unsigned long long t_sector(const struct trace_entry *ent)
+{
+        return te_blk_io_trace(ent)->sector;
+}
+
+static inline __u16 t_error(const struct trace_entry *ent)
+{
+        return te_blk_io_trace(ent)->error;
+}
+
+static __u64 get_pdu_int(const struct trace_entry *ent)
+{
+        const __u64 *val = pdu_start(ent);
+        return be64_to_cpu(*val);
+}
+
+static void get_pdu_remap(const struct trace_entry *ent,
+                          struct blk_io_trace_remap *r)
+{
+        const struct blk_io_trace_remap *__r = pdu_start(ent);
+        __u64 sector = __r->sector;
+
+        r->device = be32_to_cpu(__r->device);
+        r->device_from = be32_to_cpu(__r->device_from);
+        r->sector = be64_to_cpu(sector);
+}
+
+typedef int (blk_log_action_t) (struct trace_iterator *iter, const char *act);
+
+static int blk_log_action_classic(struct trace_iterator *iter, const char *act)
+{
+        char rwbs[6];
+        unsigned long long ts  = iter->ts;
+        unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC);
+        unsigned secs          = (unsigned long)ts;
+        const struct blk_io_trace *t = te_blk_io_trace(iter->ent);
+
+        fill_rwbs(rwbs, t);
+
+        return trace_seq_printf(&iter->seq,
+                                "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ",
+                                MAJOR(t->device), MINOR(t->device), iter->cpu,
+                                secs, nsec_rem, iter->ent->pid, act, rwbs);
+}
+
+static int blk_log_action(struct trace_iterator *iter, const char *act)
+{
+        char rwbs[6];
+        const struct blk_io_trace *t = te_blk_io_trace(iter->ent);
+
+        fill_rwbs(rwbs, t);
+        return trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ",
+                                MAJOR(t->device), MINOR(t->device), act, rwbs);
+}
+
+static int blk_log_generic(struct trace_seq *s, const struct trace_entry *ent)
+{
+        char cmd[TASK_COMM_LEN];
+
+        trace_find_cmdline(ent->pid, cmd);
+
+        if (t_sec(ent))
+                return trace_seq_printf(s, "%llu + %u [%s]\n",
+                                        t_sector(ent), t_sec(ent), cmd);
+        return trace_seq_printf(s, "[%s]\n", cmd);
+}
+
+static int blk_log_with_error(struct trace_seq *s,
+                              const struct trace_entry *ent)
+{
+        if (t_sec(ent))
+                return trace_seq_printf(s, "%llu + %u [%d]\n", t_sector(ent),
+                                        t_sec(ent), t_error(ent));
+        return trace_seq_printf(s, "%llu [%d]\n", t_sector(ent), t_error(ent));
+}
+
+static int blk_log_remap(struct trace_seq *s, const struct trace_entry *ent)
+{
+        struct blk_io_trace_remap r = { .device = 0, };
+
+        get_pdu_remap(ent, &r);
+        return trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n",
+                               t_sector(ent),
+                               t_sec(ent), MAJOR(r.device), MINOR(r.device),
+                               (unsigned long long)r.sector);
+}
+
+static int blk_log_plug(struct trace_seq *s, const struct trace_entry *ent)
+{
+        char cmd[TASK_COMM_LEN];
+
+        trace_find_cmdline(ent->pid, cmd);
+
+        return trace_seq_printf(s, "[%s]\n", cmd);
+}
+
+static int blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent)
+{
+        char cmd[TASK_COMM_LEN];
+
+        trace_find_cmdline(ent->pid, cmd);
+
+        return trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent));
+}
+
+static int blk_log_split(struct trace_seq *s, const struct trace_entry *ent)
+{
+        char cmd[TASK_COMM_LEN];
+
+        trace_find_cmdline(ent->pid, cmd);
+
+        return trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent),
+                                get_pdu_int(ent), cmd);
+}
+
+static int blk_log_msg(struct trace_seq *s, const struct trace_entry *ent)
+{
+        int ret;
+        const struct blk_io_trace *t = te_blk_io_trace(ent);
+
+        ret = trace_seq_putmem(s, t + 1, t->pdu_len);
+        if (ret)
+                return trace_seq_putc(s, '\n');
+        return ret;
+}
+
+/*
+ * struct tracer operations
+ */
+
+static void blk_tracer_print_header(struct seq_file *m)
+{
+        if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC))
+                return;
+        seq_puts(m, "# DEV   CPU TIMESTAMP     PID ACT FLG\n"
+                    "#  |     |     |           |   |   |\n");
+}
+
+static void blk_tracer_start(struct trace_array *tr)
+{
+        blk_tracer_enabled = true;
+        trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
+}
+
+static int blk_tracer_init(struct trace_array *tr)
+{
+        blk_tr = tr;
+        blk_tracer_start(tr);
+        return 0;
+}
+
+static void blk_tracer_stop(struct trace_array *tr)
+{
+        blk_tracer_enabled = false;
+        trace_flags |= TRACE_ITER_CONTEXT_INFO;
+}
+
+static void blk_tracer_reset(struct trace_array *tr)
+{
+        blk_tracer_stop(tr);
+}
+
+static const struct {
+        const char *act[2];
+        int        (*print)(struct trace_seq *s, const struct trace_entry *ent);
+} what2act[] = {
+        [__BLK_TA_QUEUE]        = {{  "Q", "queue" },      blk_log_generic },
+        [__BLK_TA_BACKMERGE]    = {{  "M", "backmerge" },  blk_log_generic },
+        [__BLK_TA_FRONTMERGE]   = {{  "F", "frontmerge" }, blk_log_generic },
+        [__BLK_TA_GETRQ]        = {{  "G", "getrq" },      blk_log_generic },
+        [__BLK_TA_SLEEPRQ]      = {{  "S", "sleeprq" },    blk_log_generic },
+        [__BLK_TA_REQUEUE]      = {{  "R", "requeue" },    blk_log_with_error },
+        [__BLK_TA_ISSUE]        = {{  "D", "issue" },      blk_log_generic },
+        [__BLK_TA_COMPLETE]     = {{  "C", "complete" },   blk_log_with_error },
+        [__BLK_TA_PLUG]         = {{  "P", "plug" },       blk_log_plug },
+        [__BLK_TA_UNPLUG_IO]    = {{  "U", "unplug_io" },  blk_log_unplug },
+        [__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug },
+        [__BLK_TA_INSERT]       = {{  "I", "insert" },     blk_log_generic },
+        [__BLK_TA_SPLIT]        = {{  "X", "split" },      blk_log_split },
+        [__BLK_TA_BOUNCE]       = {{  "B", "bounce" },     blk_log_generic },
+        [__BLK_TA_REMAP]        = {{  "A", "remap" },      blk_log_remap },
+};
+
+static enum print_line_t print_one_line(struct trace_iterator *iter,
+                                        bool classic)
+{
+        struct trace_seq *s = &iter->seq;
+        const struct blk_io_trace *t;
+        u16 what;
+        int ret;
+        bool long_act;
+        blk_log_action_t *log_action;
+
+        t          = te_blk_io_trace(iter->ent);
+        what       = t->action & ((1 << BLK_TC_SHIFT) - 1);
+        long_act   = !!(trace_flags & TRACE_ITER_VERBOSE);
+        log_action = classic ? &blk_log_action_classic : &blk_log_action;
+
+        if (t->action == BLK_TN_MESSAGE) {
+                ret = log_action(iter, long_act ? "message" : "m");
+                if (ret)
+                        ret = blk_log_msg(s, iter->ent);
+                goto out;
+        }
+
+        if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act)))
+                ret = trace_seq_printf(s, "Bad pc action %x\n", what);
+        else {
+                ret = log_action(iter, what2act[what].act[long_act]);
+                if (ret)
+                        ret = what2act[what].print(s, iter->ent);
+        }
+out:
+        return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
+}
+
+static enum print_line_t blk_trace_event_print(struct trace_iterator *iter,
+                                               int flags)
+{
+        if (!trace_print_context(iter))
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return print_one_line(iter, false);
+}
+
+static int blk_trace_synthesize_old_trace(struct trace_iterator *iter)
+{
+        struct trace_seq *s = &iter->seq;
+        struct blk_io_trace *t = (struct blk_io_trace *)iter->ent;
+        const int offset = offsetof(struct blk_io_trace, sector);
+        struct blk_io_trace old = {
+                .magic    = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION,
+                .time     = iter->ts,
+        };
+
+        if (!trace_seq_putmem(s, &old, offset))
+                return 0;
+        return trace_seq_putmem(s, &t->sector,
+                                sizeof(old) - offset + t->pdu_len);
+}
+
+static enum print_line_t
+blk_trace_event_print_binary(struct trace_iterator *iter, int flags)
+{
+        return blk_trace_synthesize_old_trace(iter) ?
+                        TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
+}
+
+static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter)
+{
+        if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC))
+                return TRACE_TYPE_UNHANDLED;
+
+        return print_one_line(iter, true);
+}
+
+static struct tracer blk_tracer __read_mostly = {
+        .name           = "blk",
+        .init           = blk_tracer_init,
+        .reset          = blk_tracer_reset,
+        .start          = blk_tracer_start,
+        .stop           = blk_tracer_stop,
+        .print_header   = blk_tracer_print_header,
+        .print_line     = blk_tracer_print_line,
+        .flags          = &blk_tracer_flags,
+};
+
+static struct trace_event trace_blk_event = {
+        .type           = TRACE_BLK,
+        .trace          = blk_trace_event_print,
+        .binary         = blk_trace_event_print_binary,
+};
+
+static int __init init_blk_tracer(void)
+{
+        if (!register_ftrace_event(&trace_blk_event)) {
+                pr_warning("Warning: could not register block events\n");
+                return 1;
+        }
+
+        if (register_tracer(&blk_tracer) != 0) {
+                pr_warning("Warning: could not register the block tracer\n");
+                unregister_ftrace_event(&trace_blk_event);
+                return 1;
+        }
+
+        return 0;
+}
+
+device_initcall(init_blk_tracer);
+
+static int blk_trace_remove_queue(struct request_queue *q)
+{
+        struct blk_trace *bt;
+
+        bt = xchg(&q->blk_trace, NULL);
+        if (bt == NULL)
+                return -EINVAL;
+
+        if (atomic_dec_and_test(&blk_probes_ref))
+                blk_unregister_tracepoints();
+
+        blk_trace_free(bt);
+        return 0;
+}
+
+/*
+ * Setup everything required to start tracing
+ */
+static int blk_trace_setup_queue(struct request_queue *q, dev_t dev)
+{
+        struct blk_trace *old_bt, *bt = NULL;
+        int ret = -ENOMEM;
+
+        bt = kzalloc(sizeof(*bt), GFP_KERNEL);
+        if (!bt)
+                return -ENOMEM;
+
+        bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char));
+        if (!bt->msg_data)
+                goto free_bt;
+
+        bt->dev = dev;
+        bt->act_mask = (u16)-1;
+        bt->end_lba = -1ULL;
+
+        old_bt = xchg(&q->blk_trace, bt);
+        if (old_bt != NULL) {
+                (void)xchg(&q->blk_trace, old_bt);
+                ret = -EBUSY;
+                goto free_bt;
+        }
+
+        if (atomic_inc_return(&blk_probes_ref) == 1)
+                blk_register_tracepoints();
+        return 0;
+
+free_bt:
+        blk_trace_free(bt);
+        return ret;
+}
+
+/*
+ * sysfs interface to enable and configure tracing
+ */
+
+static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
+                                         struct device_attribute *attr,
+                                         char *buf);
+static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
+                                          struct device_attribute *attr,
+                                          const char *buf, size_t count);
+#define BLK_TRACE_DEVICE_ATTR(_name) \
+        DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \
+                    sysfs_blk_trace_attr_show, \
+                    sysfs_blk_trace_attr_store)
+
+static BLK_TRACE_DEVICE_ATTR(enable);
+static BLK_TRACE_DEVICE_ATTR(act_mask);
+static BLK_TRACE_DEVICE_ATTR(pid);
+static BLK_TRACE_DEVICE_ATTR(start_lba);
+static BLK_TRACE_DEVICE_ATTR(end_lba);
+
+static struct attribute *blk_trace_attrs[] = {
+        &dev_attr_enable.attr,
+        &dev_attr_act_mask.attr,
+        &dev_attr_pid.attr,
+        &dev_attr_start_lba.attr,
+        &dev_attr_end_lba.attr,
+        NULL
+};
+
+struct attribute_group blk_trace_attr_group = {
+        .name  = "trace",
+        .attrs = blk_trace_attrs,
+};
+
+static const struct {
+        int mask;
+        const char *str;
+} mask_maps[] = {
+        { BLK_TC_READ,          "read"          },
+        { BLK_TC_WRITE,         "write"         },
+        { BLK_TC_BARRIER,       "barrier"       },
+        { BLK_TC_SYNC,          "sync"          },
+        { BLK_TC_QUEUE,         "queue"         },
+        { BLK_TC_REQUEUE,       "requeue"       },
+        { BLK_TC_ISSUE,         "issue"         },
+        { BLK_TC_COMPLETE,      "complete"      },
+        { BLK_TC_FS,            "fs"            },
+        { BLK_TC_PC,            "pc"            },
+        { BLK_TC_AHEAD,         "ahead"         },
+        { BLK_TC_META,          "meta"          },
+        { BLK_TC_DISCARD,       "discard"       },
+        { BLK_TC_DRV_DATA,      "drv_data"      },
+};
+
+static int blk_trace_str2mask(const char *str)
+{
+        int i;
+        int mask = 0;
+        char *s, *token;
+
+        s = kstrdup(str, GFP_KERNEL);
+        if (s == NULL)
+                return -ENOMEM;
+        s = strstrip(s);
+
+        while (1) {
+                token = strsep(&s, ",");
+                if (token == NULL)
+                        break;
+
+                if (*token == '\0')
+                        continue;
+
+                for (i = 0; i < ARRAY_SIZE(mask_maps); i++) {
+                        if (strcasecmp(token, mask_maps[i].str) == 0) {
+                                mask |= mask_maps[i].mask;
+                                break;
+                        }
+                }
+                if (i == ARRAY_SIZE(mask_maps)) {
+                        mask = -EINVAL;
+                        break;
+                }
+        }
+        kfree(s);
+
+        return mask;
+}
+
+static ssize_t blk_trace_mask2str(char *buf, int mask)
+{
+        int i;
+        char *p = buf;
+
+        for (i = 0; i < ARRAY_SIZE(mask_maps); i++) {
+                if (mask & mask_maps[i].mask) {
+                        p += sprintf(p, "%s%s",
+                                    (p == buf) ? "" : ",", mask_maps[i].str);
+                }
+        }
+        *p++ = '\n';
+
+        return p - buf;
+}
+
+static struct request_queue *blk_trace_get_queue(struct block_device *bdev)
+{
+        if (bdev->bd_disk == NULL)
+                return NULL;
+
+        return bdev_get_queue(bdev);
+}
+
+static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
+                                         struct device_attribute *attr,
+                                         char *buf)
+{
+        struct hd_struct *p = dev_to_part(dev);
+        struct request_queue *q;
+        struct block_device *bdev;
+        ssize_t ret = -ENXIO;
+
+        lock_kernel();
+        bdev = bdget(part_devt(p));
+        if (bdev == NULL)
+                goto out_unlock_kernel;
+
+        q = blk_trace_get_queue(bdev);
+        if (q == NULL)
+                goto out_bdput;
+
+        mutex_lock(&bdev->bd_mutex);
+
+        if (attr == &dev_attr_enable) {
+                ret = sprintf(buf, "%u\n", !!q->blk_trace);
+                goto out_unlock_bdev;
+        }
+
+        if (q->blk_trace == NULL)
+                ret = sprintf(buf, "disabled\n");
+        else if (attr == &dev_attr_act_mask)
+                ret = blk_trace_mask2str(buf, q->blk_trace->act_mask);
+        else if (attr == &dev_attr_pid)
+                ret = sprintf(buf, "%u\n", q->blk_trace->pid);
+        else if (attr == &dev_attr_start_lba)
+                ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba);
+        else if (attr == &dev_attr_end_lba)
+                ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba);
+
+out_unlock_bdev:
+        mutex_unlock(&bdev->bd_mutex);
+out_bdput:
+        bdput(bdev);
+out_unlock_kernel:
+        unlock_kernel();
+        return ret;
+}
+
+static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
+                                          struct device_attribute *attr,
+                                          const char *buf, size_t count)
+{
+        struct block_device *bdev;
+        struct request_queue *q;
+        struct hd_struct *p;
+        u64 value;
+        ssize_t ret = -EINVAL;
+
+        if (count == 0)
+                goto out;
+
+        if (attr == &dev_attr_act_mask) {
+                if (sscanf(buf, "%llx", &value) != 1) {
+                        /* Assume it is a list of trace category names */
+                        ret = blk_trace_str2mask(buf);
+                        if (ret < 0)
+                                goto out;
+                        value = ret;
+                }
+        } else if (sscanf(buf, "%llu", &value) != 1)
+                goto out;
+
+        ret = -ENXIO;
+
+        lock_kernel();
+        p = dev_to_part(dev);
+        bdev = bdget(part_devt(p));
+        if (bdev == NULL)
+                goto out_unlock_kernel;
+
+        q = blk_trace_get_queue(bdev);
+        if (q == NULL)
+                goto out_bdput;
+
+        mutex_lock(&bdev->bd_mutex);
+
+        if (attr == &dev_attr_enable) {
+                if (value)
+                        ret = blk_trace_setup_queue(q, bdev->bd_dev);
+                else
+                        ret = blk_trace_remove_queue(q);
+                goto out_unlock_bdev;
+        }
+
+        ret = 0;
+        if (q->blk_trace == NULL)
+                ret = blk_trace_setup_queue(q, bdev->bd_dev);
+
+        if (ret == 0) {
+                if (attr == &dev_attr_act_mask)
+                        q->blk_trace->act_mask = value;
+                else if (attr == &dev_attr_pid)
+                        q->blk_trace->pid = value;
+                else if (attr == &dev_attr_start_lba)
+                        q->blk_trace->start_lba = value;
+                else if (attr == &dev_attr_end_lba)
+                        q->blk_trace->end_lba = value;
+        }
+
+out_unlock_bdev:
+        mutex_unlock(&bdev->bd_mutex);
+out_bdput:
+        bdput(bdev);
+out_unlock_kernel:
+        unlock_kernel();
+out:
+        return ret ? ret : count;
+}
+
diff --git a/kernel/trace/events.c b/kernel/trace/events.c
new file mode 100644
index 000000000000..246f2aa6dc46
--- /dev/null
+++ b/kernel/trace/events.c
@@ -0,0 +1,14 @@
+/*
+ * This is the place to register all trace points as events.
+ */
+
+#include <linux/stringify.h>
+
+#include <trace/trace_events.h>
+
+#include "trace_output.h"
+
+#include "trace_events_stage_1.h"
+#include "trace_events_stage_2.h"
+#include "trace_events_stage_3.h"
+
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 9a236ffe2aa4..f1ed080406c3 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -27,6 +27,9 @@
 #include <linux/sysctl.h>
 #include <linux/ctype.h>
 #include <linux/list.h>
+#include <linux/hash.h>
+
+#include <trace/sched.h>
 
 #include <asm/ftrace.h>
 
@@ -44,14 +47,14 @@
                         ftrace_kill();          \
         } while (0)
 
+/* hash bits for specific function selection */
+#define FTRACE_HASH_BITS 7
+#define FTRACE_FUNC_HASHSIZE (1 << FTRACE_HASH_BITS)
+
 /* ftrace_enabled is a method to turn ftrace on or off */
 int ftrace_enabled __read_mostly;
 static int last_ftrace_enabled;
 
-/* set when tracing only a pid */
-struct pid *ftrace_pid_trace;
-static struct pid * const ftrace_swapper_pid = &init_struct_pid;
-
 /* Quick disabling of function tracer. */
 int function_trace_stop;
 
@@ -61,9 +64,7 @@ int function_trace_stop;
  */
 static int ftrace_disabled __read_mostly;
 
-static DEFINE_SPINLOCK(ftrace_lock);
-static DEFINE_MUTEX(ftrace_sysctl_lock);
-static DEFINE_MUTEX(ftrace_start_lock);
+static DEFINE_MUTEX(ftrace_lock);
 
 static struct ftrace_ops ftrace_list_end __read_mostly =
 {
@@ -134,9 +135,6 @@ static void ftrace_test_stop_func(unsigned long ip, unsigned long parent_ip)
 
 static int __register_ftrace_function(struct ftrace_ops *ops)
 {
-        /* should not be called from interrupt context */
-        spin_lock(&ftrace_lock);
-
         ops->next = ftrace_list;
         /*
          * We are entering ops into the ftrace_list but another
@@ -172,18 +170,12 @@ static int __register_ftrace_function(struct ftrace_ops *ops)
 #endif
         }
 
-        spin_unlock(&ftrace_lock);
-
         return 0;
 }
 
 static int __unregister_ftrace_function(struct ftrace_ops *ops)
 {
         struct ftrace_ops **p;
-        int ret = 0;
-
-        /* should not be called from interrupt context */
-        spin_lock(&ftrace_lock);
 
         /*
          * If we are removing the last function, then simply point
@@ -192,17 +184,15 @@ static int __unregister_ftrace_function(struct ftrace_ops *ops)
         if (ftrace_list == ops && ops->next == &ftrace_list_end) {
                 ftrace_trace_function = ftrace_stub;
                 ftrace_list = &ftrace_list_end;
-                goto out;
+                return 0;
         }
 
         for (p = &ftrace_list; *p != &ftrace_list_end; p = &(*p)->next)
                 if (*p == ops)
                         break;
 
-        if (*p != ops) {
-                ret = -1;
-                goto out;
-        }
+        if (*p != ops)
+                return -1;
 
         *p = (*p)->next;
 
@@ -223,21 +213,15 @@ static int __unregister_ftrace_function(struct ftrace_ops *ops)
                 }
         }
 
- out:
-        spin_unlock(&ftrace_lock);
-
-        return ret;
+        return 0;
 }
 
 static void ftrace_update_pid_func(void)
 {
         ftrace_func_t func;
 
-        /* should not be called from interrupt context */
-        spin_lock(&ftrace_lock);
-
         if (ftrace_trace_function == ftrace_stub)
-                goto out;
+                return;
 
         func = ftrace_trace_function;
 
@@ -254,23 +238,29 @@ static void ftrace_update_pid_func(void)
 #else
         __ftrace_trace_function = func;
 #endif
-
- out:
-        spin_unlock(&ftrace_lock);
 }
 
+/* set when tracing only a pid */
+struct pid *ftrace_pid_trace;
+static struct pid * const ftrace_swapper_pid = &init_struct_pid;
+
 #ifdef CONFIG_DYNAMIC_FTRACE
+
 #ifndef CONFIG_FTRACE_MCOUNT_RECORD
 # error Dynamic ftrace depends on MCOUNT_RECORD
 #endif
 
-/*
- * Since MCOUNT_ADDR may point to mcount itself, we do not want
- * to get it confused by reading a reference in the code as we
- * are parsing on objcopy output of text. Use a variable for
- * it instead.
- */
-static unsigned long mcount_addr = MCOUNT_ADDR;
+static struct hlist_head ftrace_func_hash[FTRACE_FUNC_HASHSIZE] __read_mostly;
+
+struct ftrace_func_probe {
+        struct hlist_node       node;
+        struct ftrace_probe_ops *ops;
+        unsigned long           flags;
+        unsigned long           ip;
+        void                    *data;
+        struct rcu_head         rcu;
+};
+
 
 enum {
         FTRACE_ENABLE_CALLS             = (1 << 0),
@@ -284,13 +274,13 @@ enum {
 
 static int ftrace_filtered;
 
-static LIST_HEAD(ftrace_new_addrs);
+static struct dyn_ftrace *ftrace_new_addrs;
 
 static DEFINE_MUTEX(ftrace_regex_lock);
 
 struct ftrace_page {
         struct ftrace_page      *next;
-        unsigned long           index;
+        int                     index;
         struct dyn_ftrace       records[];
 };
 
@@ -305,6 +295,19 @@ static struct ftrace_page	*ftrace_pages;
 
 static struct dyn_ftrace *ftrace_free_records;
 
+/*
+ * This is a double for. Do not use 'break' to break out of the loop,
+ * you must use a goto.
+ */
+#define do_for_each_ftrace_rec(pg, rec)                                 \
+        for (pg = ftrace_pages_start; pg; pg = pg->next) {              \
+                int _____i;                                             \
+                for (_____i = 0; _____i < pg->index; _____i++) {        \
+                        rec = &pg->records[_____i];
+
+#define while_for_each_ftrace_rec()             \
+                }                               \
+        }
 
 #ifdef CONFIG_KPROBES
 
@@ -338,7 +341,7 @@ static inline int record_frozen(struct dyn_ftrace *rec)
 
 static void ftrace_free_rec(struct dyn_ftrace *rec)
 {
-        rec->ip = (unsigned long)ftrace_free_records;
+        rec->freelist = ftrace_free_records;
         ftrace_free_records = rec;
         rec->flags |= FTRACE_FL_FREE;
 }
@@ -349,23 +352,22 @@ void ftrace_release(void *start, unsigned long size)
         struct ftrace_page *pg;
         unsigned long s = (unsigned long)start;
         unsigned long e = s + size;
-        int i;
 
         if (ftrace_disabled || !start)
                 return;
 
-        /* should not be called from interrupt context */
-        spin_lock(&ftrace_lock);
-
-        for (pg = ftrace_pages_start; pg; pg = pg->next) {
-                for (i = 0; i < pg->index; i++) {
-                        rec = &pg->records[i];
-
-                        if ((rec->ip >= s) && (rec->ip < e))
-                                ftrace_free_rec(rec);
+        mutex_lock(&ftrace_lock);
+        do_for_each_ftrace_rec(pg, rec) {
+                if ((rec->ip >= s) && (rec->ip < e)) {
+                        /*
+                         * rec->ip is changed in ftrace_free_rec()
+                         * It should not between s and e if record was freed.
+                         */
+                        FTRACE_WARN_ON(rec->flags & FTRACE_FL_FREE);
+                        ftrace_free_rec(rec);
                 }
-        }
-        spin_unlock(&ftrace_lock);
+        } while_for_each_ftrace_rec();
+        mutex_unlock(&ftrace_lock);
 }
 
 static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip)
@@ -382,7 +384,7 @@ static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip)
                         return NULL;
                 }
 
-                ftrace_free_records = (void *)rec->ip;
+                ftrace_free_records = rec->freelist;
                 memset(rec, 0, sizeof(*rec));
                 return rec;
         }
@@ -414,8 +416,8 @@ ftrace_record_ip(unsigned long ip)
                 return NULL;
 
         rec->ip = ip;
-
-        list_add(&rec->list, &ftrace_new_addrs);
+        rec->newlist = ftrace_new_addrs;
+        ftrace_new_addrs = rec;
 
         return rec;
 }
@@ -461,10 +463,10 @@ static void ftrace_bug(int failed, unsigned long ip)
 static int
 __ftrace_replace_code(struct dyn_ftrace *rec, int enable)
 {
-        unsigned long ip, fl;
         unsigned long ftrace_addr;
+        unsigned long ip, fl;
 
-        ftrace_addr = (unsigned long)ftrace_caller;
+        ftrace_addr = (unsigned long)FTRACE_ADDR;
 
         ip = rec->ip;
 
@@ -473,7 +475,7 @@ __ftrace_replace_code(struct dyn_ftrace *rec, int enable)
          * it is not enabled then do nothing.
          *
          * If this record is not to be traced and
-         * it is enabled then disabled it.
+         * it is enabled then disable it.
          *
          */
         if (rec->flags & FTRACE_FL_NOTRACE) {
@@ -493,7 +495,7 @@ __ftrace_replace_code(struct dyn_ftrace *rec, int enable)
                 if (fl == (FTRACE_FL_FILTER | FTRACE_FL_ENABLED))
                         return 0;
 
-                /* Record is not filtered and is not enabled do nothing */
+                /* Record is not filtered or enabled, do nothing */
                 if (!fl)
                         return 0;
 
@@ -515,7 +517,7 @@ __ftrace_replace_code(struct dyn_ftrace *rec, int enable)
 
                 } else {
 
-                        /* if record is not enabled do nothing */
+                        /* if record is not enabled, do nothing */
                         if (!(rec->flags & FTRACE_FL_ENABLED))
                                 return 0;
 
@@ -531,41 +533,41 @@ __ftrace_replace_code(struct dyn_ftrace *rec, int enable)
 
 static void ftrace_replace_code(int enable)
 {
-        int i, failed;
         struct dyn_ftrace *rec;
         struct ftrace_page *pg;
+        int failed;
 
-        for (pg = ftrace_pages_start; pg; pg = pg->next) {
-                for (i = 0; i < pg->index; i++) {
-                        rec = &pg->records[i];
-
-                        /*
-                         * Skip over free records and records that have
-                         * failed.
-                         */
-                        if (rec->flags & FTRACE_FL_FREE ||
-                            rec->flags & FTRACE_FL_FAILED)
-                                continue;
+        do_for_each_ftrace_rec(pg, rec) {
+                /*
+                 * Skip over free records, records that have
+                 * failed and not converted.
+                 */
+                if (rec->flags & FTRACE_FL_FREE ||
+                    rec->flags & FTRACE_FL_FAILED ||
+                    !(rec->flags & FTRACE_FL_CONVERTED))
+                        continue;
 
-                        /* ignore updates to this record's mcount site */
-                        if (get_kprobe((void *)rec->ip)) {
-                                freeze_record(rec);
-                                continue;
-                        } else {
-                                unfreeze_record(rec);
-                        }
+                /* ignore updates to this record's mcount site */
+                if (get_kprobe((void *)rec->ip)) {
+                        freeze_record(rec);
+                        continue;
+                } else {
+                        unfreeze_record(rec);
+                }
 
-                        failed = __ftrace_replace_code(rec, enable);
-                        if (failed && (rec->flags & FTRACE_FL_CONVERTED)) {
-                                rec->flags |= FTRACE_FL_FAILED;
-                                if ((system_state == SYSTEM_BOOTING) ||
-                                    !core_kernel_text(rec->ip)) {
-                                        ftrace_free_rec(rec);
-                                } else
-                                        ftrace_bug(failed, rec->ip);
-                        }
+                failed = __ftrace_replace_code(rec, enable);
+                if (failed) {
+                        rec->flags |= FTRACE_FL_FAILED;
+                        if ((system_state == SYSTEM_BOOTING) ||
+                            !core_kernel_text(rec->ip)) {
+                                ftrace_free_rec(rec);
+                                } else {
+                                ftrace_bug(failed, rec->ip);
+                                        /* Stop processing */
+                                        return;
+                                }
                 }
-        }
+        } while_for_each_ftrace_rec();
 }
 
 static int
@@ -576,7 +578,7 @@ ftrace_code_disable(struct module *mod, struct dyn_ftrace *rec)
 
         ip = rec->ip;
 
-        ret = ftrace_make_nop(mod, rec, mcount_addr);
+        ret = ftrace_make_nop(mod, rec, MCOUNT_ADDR);
         if (ret) {
                 ftrace_bug(ret, ip);
                 rec->flags |= FTRACE_FL_FAILED;
@@ -585,6 +587,24 @@ ftrace_code_disable(struct module *mod, struct dyn_ftrace *rec)
         return 1;
 }
 
+/*
+ * archs can override this function if they must do something
+ * before the modifying code is performed.
+ */
+int __weak ftrace_arch_code_modify_prepare(void)
+{
+        return 0;
+}
+
+/*
+ * archs can override this function if they must do something
+ * after the modifying code is performed.
+ */
+int __weak ftrace_arch_code_modify_post_process(void)
+{
+        return 0;
+}
+
 static int __ftrace_modify_code(void *data)
 {
         int *command = data;
@@ -607,7 +627,17 @@ static int __ftrace_modify_code(void *data)
 
 static void ftrace_run_update_code(int command)
 {
+        int ret;
+
+        ret = ftrace_arch_code_modify_prepare();
+        FTRACE_WARN_ON(ret);
+        if (ret)
+                return;
+
         stop_machine(__ftrace_modify_code, &command, NULL);
+
+        ret = ftrace_arch_code_modify_post_process();
+        FTRACE_WARN_ON(ret);
 }
 
 static ftrace_func_t saved_ftrace_func;
@@ -631,13 +661,10 @@ static void ftrace_startup(int command)
         if (unlikely(ftrace_disabled))
                 return;
 
-        mutex_lock(&ftrace_start_lock);
         ftrace_start_up++;
         command |= FTRACE_ENABLE_CALLS;
 
         ftrace_startup_enable(command);
-
-        mutex_unlock(&ftrace_start_lock);
 }
 
 static void ftrace_shutdown(int command)
@@ -645,7 +672,6 @@ static void ftrace_shutdown(int command)
         if (unlikely(ftrace_disabled))
                 return;
 
-        mutex_lock(&ftrace_start_lock);
         ftrace_start_up--;
         if (!ftrace_start_up)
                 command |= FTRACE_DISABLE_CALLS;
@@ -656,11 +682,9 @@ static void ftrace_shutdown(int command)
         }
 
         if (!command || !ftrace_enabled)
-                goto out;
+                return;
 
         ftrace_run_update_code(command);
- out:
-        mutex_unlock(&ftrace_start_lock);
 }
 
 static void ftrace_startup_sysctl(void)
@@ -670,7 +694,6 @@ static void ftrace_startup_sysctl(void)
         if (unlikely(ftrace_disabled))
                 return;
 
-        mutex_lock(&ftrace_start_lock);
         /* Force update next time */
         saved_ftrace_func = NULL;
         /* ftrace_start_up is true if we want ftrace running */
@@ -678,7 +701,6 @@ static void ftrace_startup_sysctl(void)
                 command |= FTRACE_ENABLE_CALLS;
 
         ftrace_run_update_code(command);
-        mutex_unlock(&ftrace_start_lock);
 }
 
 static void ftrace_shutdown_sysctl(void)
@@ -688,13 +710,11 @@ static void ftrace_shutdown_sysctl(void)
         if (unlikely(ftrace_disabled))
                 return;
 
-        mutex_lock(&ftrace_start_lock);
         /* ftrace_start_up is true if ftrace is running */
         if (ftrace_start_up)
                 command |= FTRACE_DISABLE_CALLS;
 
         ftrace_run_update_code(command);
-        mutex_unlock(&ftrace_start_lock);
 }
 
 static cycle_t          ftrace_update_time;
@@ -703,19 +723,21 @@ unsigned long		ftrace_update_tot_cnt;
 
 static int ftrace_update_code(struct module *mod)
 {
-        struct dyn_ftrace *p, *t;
+        struct dyn_ftrace *p;
         cycle_t start, stop;
 
         start = ftrace_now(raw_smp_processor_id());
         ftrace_update_cnt = 0;
 
-        list_for_each_entry_safe(p, t, &ftrace_new_addrs, list) {
+        while (ftrace_new_addrs) {
 
                 /* If something went wrong, bail without enabling anything */
                 if (unlikely(ftrace_disabled))
                         return -1;
 
-                list_del_init(&p->list);
+                p = ftrace_new_addrs;
+                ftrace_new_addrs = p->newlist;
+                p->flags = 0L;
 
                 /* convert record (i.e, patch mcount-call with NOP) */
                 if (ftrace_code_disable(mod, p)) {
@@ -781,13 +803,16 @@ enum {
         FTRACE_ITER_CONT        = (1 << 1),
         FTRACE_ITER_NOTRACE     = (1 << 2),
         FTRACE_ITER_FAILURES    = (1 << 3),
+        FTRACE_ITER_PRINTALL    = (1 << 4),
+        FTRACE_ITER_HASH        = (1 << 5),
 };
 
 #define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */
 
 struct ftrace_iterator {
         struct ftrace_page      *pg;
-        unsigned                idx;
+        int                     hidx;
+        int                     idx;
         unsigned                flags;
         unsigned char           buffer[FTRACE_BUFF_MAX+1];
         unsigned                buffer_idx;
@@ -795,15 +820,89 @@ struct ftrace_iterator {
 };
 
 static void *
+t_hash_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        struct ftrace_iterator *iter = m->private;
+        struct hlist_node *hnd = v;
+        struct hlist_head *hhd;
+
+        WARN_ON(!(iter->flags & FTRACE_ITER_HASH));
+
+        (*pos)++;
+
+ retry:
+        if (iter->hidx >= FTRACE_FUNC_HASHSIZE)
+                return NULL;
+
+        hhd = &ftrace_func_hash[iter->hidx];
+
+        if (hlist_empty(hhd)) {
+                iter->hidx++;
+                hnd = NULL;
+                goto retry;
+        }
+
+        if (!hnd)
+                hnd = hhd->first;
+        else {
+                hnd = hnd->next;
+                if (!hnd) {
+                        iter->hidx++;
+                        goto retry;
+                }
+        }
+
+        return hnd;
+}
+
+static void *t_hash_start(struct seq_file *m, loff_t *pos)
+{
+        struct ftrace_iterator *iter = m->private;
+        void *p = NULL;
+
+        iter->flags |= FTRACE_ITER_HASH;
+
+        return t_hash_next(m, p, pos);
+}
+
+static int t_hash_show(struct seq_file *m, void *v)
+{
+        struct ftrace_func_probe *rec;
+        struct hlist_node *hnd = v;
+        char str[KSYM_SYMBOL_LEN];
+
+        rec = hlist_entry(hnd, struct ftrace_func_probe, node);
+
+        if (rec->ops->print)
+                return rec->ops->print(m, rec->ip, rec->ops, rec->data);
+
+        kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
+        seq_printf(m, "%s:", str);
+
+        kallsyms_lookup((unsigned long)rec->ops->func, NULL, NULL, NULL, str);
+        seq_printf(m, "%s", str);
+
+        if (rec->data)
+                seq_printf(m, ":%p", rec->data);
+        seq_putc(m, '\n');
+
+        return 0;
+}
+
+static void *
 t_next(struct seq_file *m, void *v, loff_t *pos)
 {
         struct ftrace_iterator *iter = m->private;
         struct dyn_ftrace *rec = NULL;
 
+        if (iter->flags & FTRACE_ITER_HASH)
+                return t_hash_next(m, v, pos);
+
         (*pos)++;
 
-        /* should not be called from interrupt context */
-        spin_lock(&ftrace_lock);
+        if (iter->flags & FTRACE_ITER_PRINTALL)
+                return NULL;
+
  retry:
         if (iter->idx >= iter->pg->index) {
                 if (iter->pg->next) {
@@ -832,7 +931,6 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
                         goto retry;
                 }
         }
-        spin_unlock(&ftrace_lock);
 
         return rec;
 }
@@ -842,6 +940,23 @@ static void *t_start(struct seq_file *m, loff_t *pos)
         struct ftrace_iterator *iter = m->private;
         void *p = NULL;
 
+        mutex_lock(&ftrace_lock);
+        /*
+         * For set_ftrace_filter reading, if we have the filter
+         * off, we can short cut and just print out that all
+         * functions are enabled.
+         */
+        if (iter->flags & FTRACE_ITER_FILTER && !ftrace_filtered) {
+                if (*pos > 0)
+                        return t_hash_start(m, pos);
+                iter->flags |= FTRACE_ITER_PRINTALL;
+                (*pos)++;
+                return iter;
+        }
+
+        if (iter->flags & FTRACE_ITER_HASH)
+                return t_hash_start(m, pos);
+
         if (*pos > 0) {
                 if (iter->idx < 0)
                         return p;
@@ -851,18 +966,31 @@ static void *t_start(struct seq_file *m, loff_t *pos)
 
         p = t_next(m, p, pos);
 
+        if (!p)
+                return t_hash_start(m, pos);
+
         return p;
 }
 
 static void t_stop(struct seq_file *m, void *p)
 {
+        mutex_unlock(&ftrace_lock);
 }
 
 static int t_show(struct seq_file *m, void *v)
 {
+        struct ftrace_iterator *iter = m->private;
         struct dyn_ftrace *rec = v;
         char str[KSYM_SYMBOL_LEN];
 
+        if (iter->flags & FTRACE_ITER_HASH)
+                return t_hash_show(m, v);
+
+        if (iter->flags & FTRACE_ITER_PRINTALL) {
+                seq_printf(m, "#### all functions enabled ####\n");
+                return 0;
+        }
+
         if (!rec)
                 return 0;
 
@@ -941,23 +1069,16 @@ static void ftrace_filter_reset(int enable)
         struct ftrace_page *pg;
         struct dyn_ftrace *rec;
         unsigned long type = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
-        unsigned i;
 
-        /* should not be called from interrupt context */
-        spin_lock(&ftrace_lock);
+        mutex_lock(&ftrace_lock);
         if (enable)
                 ftrace_filtered = 0;
-        pg = ftrace_pages_start;
-        while (pg) {
-                for (i = 0; i < pg->index; i++) {
-                        rec = &pg->records[i];
-                        if (rec->flags & FTRACE_FL_FAILED)
-                                continue;
-                        rec->flags &= ~type;
-                }
-                pg = pg->next;
-        }
-        spin_unlock(&ftrace_lock);
+        do_for_each_ftrace_rec(pg, rec) {
+                if (rec->flags & FTRACE_FL_FAILED)
+                        continue;
+                rec->flags &= ~type;
+        } while_for_each_ftrace_rec();
+        mutex_unlock(&ftrace_lock);
 }
 
 static int
@@ -1008,16 +1129,6 @@ ftrace_notrace_open(struct inode *inode, struct file *file)
         return ftrace_regex_open(inode, file, 0);
 }
 
-static ssize_t
-ftrace_regex_read(struct file *file, char __user *ubuf,
-                       size_t cnt, loff_t *ppos)
-{
-        if (file->f_mode & FMODE_READ)
-                return seq_read(file, ubuf, cnt, ppos);
-        else
-                return -EPERM;
-}
-
 static loff_t
 ftrace_regex_lseek(struct file *file, loff_t offset, int origin)
 {
@@ -1038,86 +1149,536 @@ enum {
         MATCH_END_ONLY,
 };
 
-static void
-ftrace_match(unsigned char *buff, int len, int enable)
+/*
+ * (static function - no need for kernel doc)
+ *
+ * Pass in a buffer containing a glob and this function will
+ * set search to point to the search part of the buffer and
+ * return the type of search it is (see enum above).
+ * This does modify buff.
+ *
+ * Returns enum type.
+ *  search returns the pointer to use for comparison.
+ *  not returns 1 if buff started with a '!'
+ *     0 otherwise.
+ */
+static int
+ftrace_setup_glob(char *buff, int len, char **search, int *not)
 {
-        char str[KSYM_SYMBOL_LEN];
-        char *search = NULL;
-        struct ftrace_page *pg;
-        struct dyn_ftrace *rec;
         int type = MATCH_FULL;
-        unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
-        unsigned i, match = 0, search_len = 0;
-        int not = 0;
+        int i;
 
         if (buff[0] == '!') {
-                not = 1;
+                *not = 1;
                 buff++;
                 len--;
-        }
+        } else
+                *not = 0;
+
+        *search = buff;
 
         for (i = 0; i < len; i++) {
                 if (buff[i] == '*') {
                         if (!i) {
-                                search = buff + i + 1;
+                                *search = buff + 1;
                                 type = MATCH_END_ONLY;
-                                search_len = len - (i + 1);
                         } else {
-                                if (type == MATCH_END_ONLY) {
+                                if (type == MATCH_END_ONLY)
                                         type = MATCH_MIDDLE_ONLY;
-                                } else {
-                                        match = i;
+                                else
                                         type = MATCH_FRONT_ONLY;
-                                }
                                 buff[i] = 0;
                                 break;
                         }
                 }
         }
 
-        /* should not be called from interrupt context */
-        spin_lock(&ftrace_lock);
-        if (enable)
-                ftrace_filtered = 1;
-        pg = ftrace_pages_start;
-        while (pg) {
-                for (i = 0; i < pg->index; i++) {
-                        int matched = 0;
-                        char *ptr;
-
-                        rec = &pg->records[i];
-                        if (rec->flags & FTRACE_FL_FAILED)
+        return type;
+}
+
+static int ftrace_match(char *str, char *regex, int len, int type)
+{
+        int matched = 0;
+        char *ptr;
+
+        switch (type) {
+        case MATCH_FULL:
+                if (strcmp(str, regex) == 0)
+                        matched = 1;
+                break;
+        case MATCH_FRONT_ONLY:
+                if (strncmp(str, regex, len) == 0)
+                        matched = 1;
+                break;
+        case MATCH_MIDDLE_ONLY:
+                if (strstr(str, regex))
+                        matched = 1;
+                break;
+        case MATCH_END_ONLY:
+                ptr = strstr(str, regex);
+                if (ptr && (ptr[len] == 0))
+                        matched = 1;
+                break;
+        }
+
+        return matched;
+}
+
+static int
+ftrace_match_record(struct dyn_ftrace *rec, char *regex, int len, int type)
+{
+        char str[KSYM_SYMBOL_LEN];
+
+        kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
+        return ftrace_match(str, regex, len, type);
+}
+
+static void ftrace_match_records(char *buff, int len, int enable)
+{
+        unsigned int search_len;
+        struct ftrace_page *pg;
+        struct dyn_ftrace *rec;
+        unsigned long flag;
+        char *search;
+        int type;
+        int not;
+
+        flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
+        type = ftrace_setup_glob(buff, len, &search, &not);
+
+        search_len = strlen(search);
+
+        mutex_lock(&ftrace_lock);
+        do_for_each_ftrace_rec(pg, rec) {
+
+                if (rec->flags & FTRACE_FL_FAILED)
+                        continue;
+
+                if (ftrace_match_record(rec, search, search_len, type)) {
+                        if (not)
+                                rec->flags &= ~flag;
+                        else
+                                rec->flags |= flag;
+                }
+                /*
+                 * Only enable filtering if we have a function that
+                 * is filtered on.
+                 */
+                if (enable && (rec->flags & FTRACE_FL_FILTER))
+                        ftrace_filtered = 1;
+        } while_for_each_ftrace_rec();
+        mutex_unlock(&ftrace_lock);
+}
+
+static int
+ftrace_match_module_record(struct dyn_ftrace *rec, char *mod,
+                           char *regex, int len, int type)
+{
+        char str[KSYM_SYMBOL_LEN];
+        char *modname;
+
+        kallsyms_lookup(rec->ip, NULL, NULL, &modname, str);
+
+        if (!modname || strcmp(modname, mod))
+                return 0;
+
+        /* blank search means to match all funcs in the mod */
+        if (len)
+                return ftrace_match(str, regex, len, type);
+        else
+                return 1;
+}
+
+static void ftrace_match_module_records(char *buff, char *mod, int enable)
+{
+        unsigned search_len = 0;
+        struct ftrace_page *pg;
+        struct dyn_ftrace *rec;
+        int type = MATCH_FULL;
+        char *search = buff;
+        unsigned long flag;
+        int not = 0;
+
+        flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
+
+        /* blank or '*' mean the same */
+        if (strcmp(buff, "*") == 0)
+                buff[0] = 0;
+
+        /* handle the case of 'dont filter this module' */
+        if (strcmp(buff, "!") == 0 || strcmp(buff, "!*") == 0) {
+                buff[0] = 0;
+                not = 1;
+        }
+
+        if (strlen(buff)) {
+                type = ftrace_setup_glob(buff, strlen(buff), &search, &not);
+                search_len = strlen(search);
+        }
+
+        mutex_lock(&ftrace_lock);
+        do_for_each_ftrace_rec(pg, rec) {
+
+                if (rec->flags & FTRACE_FL_FAILED)
+                        continue;
+
+                if (ftrace_match_module_record(rec, mod,
+                                               search, search_len, type)) {
+                        if (not)
+                                rec->flags &= ~flag;
+                        else
+                                rec->flags |= flag;
+                }
+                if (enable && (rec->flags & FTRACE_FL_FILTER))
+                        ftrace_filtered = 1;
+
+        } while_for_each_ftrace_rec();
+        mutex_unlock(&ftrace_lock);
+}
+
+/*
+ * We register the module command as a template to show others how
+ * to register the a command as well.
+ */
+
+static int
+ftrace_mod_callback(char *func, char *cmd, char *param, int enable)
+{
+        char *mod;
+
+        /*
+         * cmd == 'mod' because we only registered this func
+         * for the 'mod' ftrace_func_command.
+         * But if you register one func with multiple commands,
+         * you can tell which command was used by the cmd
+         * parameter.
+         */
+
+        /* we must have a module name */
+        if (!param)
+                return -EINVAL;
+
+        mod = strsep(&param, ":");
+        if (!strlen(mod))
+                return -EINVAL;
+
+        ftrace_match_module_records(func, mod, enable);
+        return 0;
+}
+
+static struct ftrace_func_command ftrace_mod_cmd = {
+        .name                   = "mod",
+        .func                   = ftrace_mod_callback,
+};
+
+static int __init ftrace_mod_cmd_init(void)
+{
+        return register_ftrace_command(&ftrace_mod_cmd);
+}
+device_initcall(ftrace_mod_cmd_init);
+
+static void
+function_trace_probe_call(unsigned long ip, unsigned long parent_ip)
+{
+        struct ftrace_func_probe *entry;
+        struct hlist_head *hhd;
+        struct hlist_node *n;
+        unsigned long key;
+        int resched;
+
+        key = hash_long(ip, FTRACE_HASH_BITS);
+
+        hhd = &ftrace_func_hash[key];
+
+        if (hlist_empty(hhd))
+                return;
+
+        /*
+         * Disable preemption for these calls to prevent a RCU grace
+         * period. This syncs the hash iteration and freeing of items
+         * on the hash. rcu_read_lock is too dangerous here.
+         */
+        resched = ftrace_preempt_disable();
+        hlist_for_each_entry_rcu(entry, n, hhd, node) {
+                if (entry->ip == ip)
+                        entry->ops->func(ip, parent_ip, &entry->data);
+        }
+        ftrace_preempt_enable(resched);
+}
+
+static struct ftrace_ops trace_probe_ops __read_mostly =
+{
+        .func = function_trace_probe_call,
+};
+
+static int ftrace_probe_registered;
+
+static void __enable_ftrace_function_probe(void)
+{
+        int i;
+
+        if (ftrace_probe_registered)
+                return;
+
+        for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) {
+                struct hlist_head *hhd = &ftrace_func_hash[i];
+                if (hhd->first)
+                        break;
+        }
+        /* Nothing registered? */
+        if (i == FTRACE_FUNC_HASHSIZE)
+                return;
+
+        __register_ftrace_function(&trace_probe_ops);
+        ftrace_startup(0);
+        ftrace_probe_registered = 1;
+}
+
+static void __disable_ftrace_function_probe(void)
+{
+        int i;
+
+        if (!ftrace_probe_registered)
+                return;
+
+        for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) {
+                struct hlist_head *hhd = &ftrace_func_hash[i];
+                if (hhd->first)
+                        return;
+        }
+
+        /* no more funcs left */
+        __unregister_ftrace_function(&trace_probe_ops);
+        ftrace_shutdown(0);
+        ftrace_probe_registered = 0;
+}
+
+
+static void ftrace_free_entry_rcu(struct rcu_head *rhp)
+{
+        struct ftrace_func_probe *entry =
+                container_of(rhp, struct ftrace_func_probe, rcu);
+
+        if (entry->ops->free)
+                entry->ops->free(&entry->data);
+        kfree(entry);
+}
+
+
+int
+register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
+                              void *data)
+{
+        struct ftrace_func_probe *entry;
+        struct ftrace_page *pg;
+        struct dyn_ftrace *rec;
+        int type, len, not;
+        unsigned long key;
+        int count = 0;
+        char *search;
+
+        type = ftrace_setup_glob(glob, strlen(glob), &search, &not);
+        len = strlen(search);
+
+        /* we do not support '!' for function probes */
+        if (WARN_ON(not))
+                return -EINVAL;
+
+        mutex_lock(&ftrace_lock);
+        do_for_each_ftrace_rec(pg, rec) {
+
+                if (rec->flags & FTRACE_FL_FAILED)
+                        continue;
+
+                if (!ftrace_match_record(rec, search, len, type))
+                        continue;
+
+                entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+                if (!entry) {
+                        /* If we did not process any, then return error */
+                        if (!count)
+                                count = -ENOMEM;
+                        goto out_unlock;
+                }
+
+                count++;
+
+                entry->data = data;
+
+                /*
+                 * The caller might want to do something special
+                 * for each function we find. We call the callback
+                 * to give the caller an opportunity to do so.
+                 */
+                if (ops->callback) {
+                        if (ops->callback(rec->ip, &entry->data) < 0) {
+                                /* caller does not like this func */
+                                kfree(entry);
                                 continue;
-                        kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
-                        switch (type) {
-                        case MATCH_FULL:
-                                if (strcmp(str, buff) == 0)
-                                        matched = 1;
-                                break;
-                        case MATCH_FRONT_ONLY:
-                                if (memcmp(str, buff, match) == 0)
-                                        matched = 1;
-                                break;
-                        case MATCH_MIDDLE_ONLY:
-                                if (strstr(str, search))
-                                        matched = 1;
-                                break;
-                        case MATCH_END_ONLY:
-                                ptr = strstr(str, search);
-                                if (ptr && (ptr[search_len] == 0))
-                                        matched = 1;
-                                break;
                         }
-                        if (matched) {
-                                if (not)
-                                        rec->flags &= ~flag;
-                                else
-                                        rec->flags |= flag;
+                }
+
+                entry->ops = ops;
+                entry->ip = rec->ip;
+
+                key = hash_long(entry->ip, FTRACE_HASH_BITS);
+                hlist_add_head_rcu(&entry->node, &ftrace_func_hash[key]);
+
+        } while_for_each_ftrace_rec();
+        __enable_ftrace_function_probe();
+
+ out_unlock:
+        mutex_unlock(&ftrace_lock);
+
+        return count;
+}
+
+enum {
+        PROBE_TEST_FUNC         = 1,
+        PROBE_TEST_DATA         = 2
+};
+
+static void
+__unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
+                                  void *data, int flags)
+{
+        struct ftrace_func_probe *entry;
+        struct hlist_node *n, *tmp;
+        char str[KSYM_SYMBOL_LEN];
+        int type = MATCH_FULL;
+        int i, len = 0;
+        char *search;
+
+        if (glob && (strcmp(glob, "*") || !strlen(glob)))
+                glob = NULL;
+        else {
+                int not;
+
+                type = ftrace_setup_glob(glob, strlen(glob), &search, &not);
+                len = strlen(search);
+
+                /* we do not support '!' for function probes */
+                if (WARN_ON(not))
+                        return;
+        }
+
+        mutex_lock(&ftrace_lock);
+        for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) {
+                struct hlist_head *hhd = &ftrace_func_hash[i];
+
+                hlist_for_each_entry_safe(entry, n, tmp, hhd, node) {
+
+                        /* break up if statements for readability */
+                        if ((flags & PROBE_TEST_FUNC) && entry->ops != ops)
+                                continue;
+
+                        if ((flags & PROBE_TEST_DATA) && entry->data != data)
+                                continue;
+
+                        /* do this last, since it is the most expensive */
+                        if (glob) {
+                                kallsyms_lookup(entry->ip, NULL, NULL,
+                                                NULL, str);
+                                if (!ftrace_match(str, glob, len, type))
+                                        continue;
                         }
+
+                        hlist_del(&entry->node);
+                        call_rcu(&entry->rcu, ftrace_free_entry_rcu);
                 }
-                pg = pg->next;
         }
-        spin_unlock(&ftrace_lock);
+        __disable_ftrace_function_probe();
+        mutex_unlock(&ftrace_lock);
+}
+
+void
+unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
+                                void *data)
+{
+        __unregister_ftrace_function_probe(glob, ops, data,
+                                          PROBE_TEST_FUNC | PROBE_TEST_DATA);
+}
+
+void
+unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops)
+{
+        __unregister_ftrace_function_probe(glob, ops, NULL, PROBE_TEST_FUNC);
+}
+
+void unregister_ftrace_function_probe_all(char *glob)
+{
+        __unregister_ftrace_function_probe(glob, NULL, NULL, 0);
+}
+
+static LIST_HEAD(ftrace_commands);
+static DEFINE_MUTEX(ftrace_cmd_mutex);
+
+int register_ftrace_command(struct ftrace_func_command *cmd)
+{
+        struct ftrace_func_command *p;
+        int ret = 0;
+
+        mutex_lock(&ftrace_cmd_mutex);
+        list_for_each_entry(p, &ftrace_commands, list) {
+                if (strcmp(cmd->name, p->name) == 0) {
+                        ret = -EBUSY;
+                        goto out_unlock;
+                }
+        }
+        list_add(&cmd->list, &ftrace_commands);
+ out_unlock:
+        mutex_unlock(&ftrace_cmd_mutex);
+
+        return ret;
+}
+
+int unregister_ftrace_command(struct ftrace_func_command *cmd)
+{
+        struct ftrace_func_command *p, *n;
+        int ret = -ENODEV;
+
+        mutex_lock(&ftrace_cmd_mutex);
+        list_for_each_entry_safe(p, n, &ftrace_commands, list) {
+                if (strcmp(cmd->name, p->name) == 0) {
+                        ret = 0;
+                        list_del_init(&p->list);
+                        goto out_unlock;
+                }
+        }
+ out_unlock:
+        mutex_unlock(&ftrace_cmd_mutex);
+
+        return ret;
+}
+
+static int ftrace_process_regex(char *buff, int len, int enable)
+{
+        char *func, *command, *next = buff;
+        struct ftrace_func_command *p;
+        int ret = -EINVAL;
+
+        func = strsep(&next, ":");
+
+        if (!next) {
+                ftrace_match_records(func, len, enable);
+                return 0;
+        }
+
+        /* command found */
+
+        command = strsep(&next, ":");
+
+        mutex_lock(&ftrace_cmd_mutex);
+        list_for_each_entry(p, &ftrace_commands, list) {
+                if (strcmp(p->name, command) == 0) {
+                        ret = p->func(func, command, next, enable);
+                        goto out_unlock;
+                }
+        }
+ out_unlock:
+        mutex_unlock(&ftrace_cmd_mutex);
+
+        return ret;
 }
 
 static ssize_t
@@ -1187,7 +1748,10 @@ ftrace_regex_write(struct file *file, const char __user *ubuf,
         if (isspace(ch)) {
                 iter->filtered++;
                 iter->buffer[iter->buffer_idx] = 0;
-                ftrace_match(iter->buffer, iter->buffer_idx, enable);
+                ret = ftrace_process_regex(iter->buffer,
+                                           iter->buffer_idx, enable);
+                if (ret)
+                        goto out;
                 iter->buffer_idx = 0;
         } else
                 iter->flags |= FTRACE_ITER_CONT;
@@ -1226,7 +1790,7 @@ ftrace_set_regex(unsigned char *buf, int len, int reset, int enable)
         if (reset)
                 ftrace_filter_reset(enable);
         if (buf)
-                ftrace_match(buf, len, enable);
+                ftrace_match_records(buf, len, enable);
         mutex_unlock(&ftrace_regex_lock);
 }
 
@@ -1276,15 +1840,13 @@ ftrace_regex_release(struct inode *inode, struct file *file, int enable)
         if (iter->buffer_idx) {
                 iter->filtered++;
                 iter->buffer[iter->buffer_idx] = 0;
-                ftrace_match(iter->buffer, iter->buffer_idx, enable);
+                ftrace_match_records(iter->buffer, iter->buffer_idx, enable);
         }
 
-        mutex_lock(&ftrace_sysctl_lock);
-        mutex_lock(&ftrace_start_lock);
+        mutex_lock(&ftrace_lock);
         if (ftrace_start_up && ftrace_enabled)
                 ftrace_run_update_code(FTRACE_ENABLE_CALLS);
-        mutex_unlock(&ftrace_start_lock);
-        mutex_unlock(&ftrace_sysctl_lock);
+        mutex_unlock(&ftrace_lock);
 
         kfree(iter);
         mutex_unlock(&ftrace_regex_lock);
@@ -1303,31 +1865,31 @@ ftrace_notrace_release(struct inode *inode, struct file *file)
         return ftrace_regex_release(inode, file, 0);
 }
 
-static struct file_operations ftrace_avail_fops = {
+static const struct file_operations ftrace_avail_fops = {
         .open = ftrace_avail_open,
         .read = seq_read,
         .llseek = seq_lseek,
         .release = ftrace_avail_release,
 };
 
-static struct file_operations ftrace_failures_fops = {
+static const struct file_operations ftrace_failures_fops = {
         .open = ftrace_failures_open,
         .read = seq_read,
         .llseek = seq_lseek,
         .release = ftrace_avail_release,
 };
 
-static struct file_operations ftrace_filter_fops = {
+static const struct file_operations ftrace_filter_fops = {
         .open = ftrace_filter_open,
-        .read = ftrace_regex_read,
+        .read = seq_read,
         .write = ftrace_filter_write,
         .llseek = ftrace_regex_lseek,
         .release = ftrace_filter_release,
 };
 
-static struct file_operations ftrace_notrace_fops = {
+static const struct file_operations ftrace_notrace_fops = {
         .open = ftrace_notrace_open,
-        .read = ftrace_regex_read,
+        .read = seq_read,
         .write = ftrace_notrace_write,
         .llseek = ftrace_regex_lseek,
         .release = ftrace_notrace_release,
@@ -1360,6 +1922,10 @@ static void *g_start(struct seq_file *m, loff_t *pos)
 
         mutex_lock(&graph_lock);
 
+        /* Nothing, tell g_show to print all functions are enabled */
+        if (!ftrace_graph_count && !*pos)
+                return (void *)1;
+
         p = g_next(m, p, pos);
 
         return p;
@@ -1378,6 +1944,11 @@ static int g_show(struct seq_file *m, void *v)
         if (!ptr)
                 return 0;
 
+        if (ptr == (unsigned long *)1) {
+                seq_printf(m, "#### all functions enabled ####\n");
+                return 0;
+        }
+
         kallsyms_lookup(*ptr, NULL, NULL, NULL, str);
 
         seq_printf(m, "%s\n", str);
@@ -1420,53 +1991,53 @@ ftrace_graph_open(struct inode *inode, struct file *file)
         return ret;
 }
 
-static ssize_t
-ftrace_graph_read(struct file *file, char __user *ubuf,
-                       size_t cnt, loff_t *ppos)
-{
-        if (file->f_mode & FMODE_READ)
-                return seq_read(file, ubuf, cnt, ppos);
-        else
-                return -EPERM;
-}
-
 static int
-ftrace_set_func(unsigned long *array, int idx, char *buffer)
+ftrace_set_func(unsigned long *array, int *idx, char *buffer)
 {
-        char str[KSYM_SYMBOL_LEN];
         struct dyn_ftrace *rec;
         struct ftrace_page *pg;
+        int search_len;
         int found = 0;
-        int i, j;
+        int type, not;
+        char *search;
+        bool exists;
+        int i;
 
         if (ftrace_disabled)
                 return -ENODEV;
 
-        /* should not be called from interrupt context */
-        spin_lock(&ftrace_lock);
+        /* decode regex */
+        type = ftrace_setup_glob(buffer, strlen(buffer), &search, &not);
+        if (not)
+                return -EINVAL;
+
+        search_len = strlen(search);
 
-        for (pg = ftrace_pages_start; pg; pg = pg->next) {
-                for (i = 0; i < pg->index; i++) {
-                        rec = &pg->records[i];
+        mutex_lock(&ftrace_lock);
+        do_for_each_ftrace_rec(pg, rec) {
 
-                        if (rec->flags & (FTRACE_FL_FAILED | FTRACE_FL_FREE))
-                                continue;
+                if (*idx >= FTRACE_GRAPH_MAX_FUNCS)
+                        break;
 
-                        kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
-                        if (strcmp(str, buffer) == 0) {
+                if (rec->flags & (FTRACE_FL_FAILED | FTRACE_FL_FREE))
+                        continue;
+
+                if (ftrace_match_record(rec, search, search_len, type)) {
+                        /* ensure it is not already in the array */
+                        exists = false;
+                        for (i = 0; i < *idx; i++)
+                                if (array[i] == rec->ip) {
+                                        exists = true;
+                                        break;
+                                }
+                        if (!exists) {
+                                array[(*idx)++] = rec->ip;
                                 found = 1;
-                                for (j = 0; j < idx; j++)
-                                        if (array[j] == rec->ip) {
-                                                found = 0;
-                                                break;
-                                        }
-                                if (found)
-                                        array[idx] = rec->ip;
-                                break;
                         }
                 }
-        }
-        spin_unlock(&ftrace_lock);
+        } while_for_each_ftrace_rec();
+
+        mutex_unlock(&ftrace_lock);
 
         return found ? 0 : -EINVAL;
 }
@@ -1534,13 +2105,11 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
         }
         buffer[index] = 0;
 
-        /* we allow only one at a time */
-        ret = ftrace_set_func(array, ftrace_graph_count, buffer);
+        /* we allow only one expression at a time */
+        ret = ftrace_set_func(array, &ftrace_graph_count, buffer);
         if (ret)
                 goto out;
 
-        ftrace_graph_count++;
-
         file->f_pos += read;
 
         ret = read;
@@ -1552,7 +2121,7 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
 
 static const struct file_operations ftrace_graph_fops = {
         .open = ftrace_graph_open,
-        .read = ftrace_graph_read,
+        .read = seq_read,
         .write = ftrace_graph_write,
 };
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
@@ -1604,7 +2173,7 @@ static int ftrace_convert_nops(struct module *mod,
         unsigned long addr;
         unsigned long flags;
 
-        mutex_lock(&ftrace_start_lock);
+        mutex_lock(&ftrace_lock);
         p = start;
         while (p < end) {
                 addr = ftrace_call_adjust(*p++);
@@ -1623,7 +2192,7 @@ static int ftrace_convert_nops(struct module *mod,
         local_irq_save(flags);
         ftrace_update_code(mod);
         local_irq_restore(flags);
-        mutex_unlock(&ftrace_start_lock);
+        mutex_unlock(&ftrace_lock);
 
         return 0;
 }
@@ -1700,7 +2269,7 @@ ftrace_pid_read(struct file *file, char __user *ubuf,
         if (ftrace_pid_trace == ftrace_swapper_pid)
                 r = sprintf(buf, "swapper tasks\n");
         else if (ftrace_pid_trace)
-                r = sprintf(buf, "%u\n", pid_nr(ftrace_pid_trace));
+                r = sprintf(buf, "%u\n", pid_vnr(ftrace_pid_trace));
         else
                 r = sprintf(buf, "no pid\n");
 
@@ -1796,7 +2365,7 @@ ftrace_pid_write(struct file *filp, const char __user *ubuf,
         if (ret < 0)
                 return ret;
 
-        mutex_lock(&ftrace_start_lock);
+        mutex_lock(&ftrace_lock);
         if (val < 0) {
                 /* disable pid tracing */
                 if (!ftrace_pid_trace)
@@ -1835,12 +2404,12 @@ ftrace_pid_write(struct file *filp, const char __user *ubuf,
         ftrace_startup_enable(0);
 
  out:
-        mutex_unlock(&ftrace_start_lock);
+        mutex_unlock(&ftrace_lock);
 
         return cnt;
 }
 
-static struct file_operations ftrace_pid_fops = {
+static const struct file_operations ftrace_pid_fops = {
         .read = ftrace_pid_read,
         .write = ftrace_pid_write,
 };
@@ -1863,7 +2432,6 @@ static __init int ftrace_init_debugfs(void)
                            "'set_ftrace_pid' entry\n");
         return 0;
 }
-
 fs_initcall(ftrace_init_debugfs);
 
 /**
@@ -1898,17 +2466,17 @@ int register_ftrace_function(struct ftrace_ops *ops)
         if (unlikely(ftrace_disabled))
                 return -1;
 
-        mutex_lock(&ftrace_sysctl_lock);
+        mutex_lock(&ftrace_lock);
 
         ret = __register_ftrace_function(ops);
         ftrace_startup(0);
 
-        mutex_unlock(&ftrace_sysctl_lock);
+        mutex_unlock(&ftrace_lock);
         return ret;
 }
 
 /**
- * unregister_ftrace_function - unresgister a function for profiling.
+ * unregister_ftrace_function - unregister a function for profiling.
  * @ops - ops structure that holds the function to unregister
  *
  * Unregister a function that was added to be called by ftrace profiling.
@@ -1917,10 +2485,10 @@ int unregister_ftrace_function(struct ftrace_ops *ops)
 {
         int ret;
 
-        mutex_lock(&ftrace_sysctl_lock);
+        mutex_lock(&ftrace_lock);
         ret = __unregister_ftrace_function(ops);
         ftrace_shutdown(0);
-        mutex_unlock(&ftrace_sysctl_lock);
+        mutex_unlock(&ftrace_lock);
 
         return ret;
 }
@@ -1935,7 +2503,7 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
         if (unlikely(ftrace_disabled))
                 return -ENODEV;
 
-        mutex_lock(&ftrace_sysctl_lock);
+        mutex_lock(&ftrace_lock);
 
         ret  = proc_dointvec(table, write, file, buffer, lenp, ppos);
 
@@ -1964,7 +2532,7 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
         }
 
  out:
-        mutex_unlock(&ftrace_sysctl_lock);
+        mutex_unlock(&ftrace_lock);
         return ret;
 }
 
@@ -2029,11 +2597,43 @@ free:
         return ret;
 }
 
+static void
+ftrace_graph_probe_sched_switch(struct rq *__rq, struct task_struct *prev,
+                                struct task_struct *next)
+{
+        unsigned long long timestamp;
+        int index;
+
+        /*
+         * Does the user want to count the time a function was asleep.
+         * If so, do not update the time stamps.
+         */
+        if (trace_flags & TRACE_ITER_SLEEP_TIME)
+                return;
+
+        timestamp = trace_clock_local();
+
+        prev->ftrace_timestamp = timestamp;
+
+        /* only process tasks that we timestamped */
+        if (!next->ftrace_timestamp)
+                return;
+
+        /*
+         * Update all the counters in next to make up for the
+         * time next was sleeping.
+         */
+        timestamp -= next->ftrace_timestamp;
+
+        for (index = next->curr_ret_stack; index >= 0; index--)
+                next->ret_stack[index].calltime += timestamp;
+}
+
 /* Allocate a return stack for each task */
 static int start_graph_tracing(void)
 {
         struct ftrace_ret_stack **ret_stack_list;
-        int ret;
+        int ret, cpu;
 
         ret_stack_list = kmalloc(FTRACE_RETSTACK_ALLOC_SIZE *
                                 sizeof(struct ftrace_ret_stack *),
@@ -2042,10 +2642,21 @@ static int start_graph_tracing(void)
         if (!ret_stack_list)
                 return -ENOMEM;
 
+        /* The cpu_boot init_task->ret_stack will never be freed */
+        for_each_online_cpu(cpu)
+                ftrace_graph_init_task(idle_task(cpu));
+
         do {
                 ret = alloc_retstack_tasklist(ret_stack_list);
         } while (ret == -EAGAIN);
 
+        if (!ret) {
+                ret = register_trace_sched_switch(ftrace_graph_probe_sched_switch);
+                if (ret)
+                        pr_info("ftrace_graph: Couldn't activate tracepoint"
+                                " probe to kernel_sched_switch\n");
+        }
+
         kfree(ret_stack_list);
         return ret;
 }
@@ -2076,7 +2687,13 @@ int register_ftrace_graph(trace_func_graph_ret_t retfunc,
 {
         int ret = 0;
 
-        mutex_lock(&ftrace_sysctl_lock);
+        mutex_lock(&ftrace_lock);
+
+        /* we currently allow only one tracer registered at a time */
+        if (atomic_read(&ftrace_graph_active)) {
+                ret = -EBUSY;
+                goto out;
+        }
 
         ftrace_suspend_notifier.notifier_call = ftrace_suspend_notifier_call;
         register_pm_notifier(&ftrace_suspend_notifier);
@@ -2094,21 +2711,26 @@ int register_ftrace_graph(trace_func_graph_ret_t retfunc,
         ftrace_startup(FTRACE_START_FUNC_RET);
 
 out:
-        mutex_unlock(&ftrace_sysctl_lock);
+        mutex_unlock(&ftrace_lock);
         return ret;
 }
 
 void unregister_ftrace_graph(void)
 {
-        mutex_lock(&ftrace_sysctl_lock);
+        mutex_lock(&ftrace_lock);
+
+        if (!unlikely(atomic_read(&ftrace_graph_active)))
+                goto out;
 
         atomic_dec(&ftrace_graph_active);
+        unregister_trace_sched_switch(ftrace_graph_probe_sched_switch);
         ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub;
         ftrace_graph_entry = ftrace_graph_entry_stub;
         ftrace_shutdown(FTRACE_STOP_FUNC_RET);
         unregister_pm_notifier(&ftrace_suspend_notifier);
 
-        mutex_unlock(&ftrace_sysctl_lock);
+ out:
+        mutex_unlock(&ftrace_lock);
 }
 
 /* Allocate a return stack for newly created task */
@@ -2123,6 +2745,7 @@ void ftrace_graph_init_task(struct task_struct *t)
                 t->curr_ret_stack = -1;
                 atomic_set(&t->tracing_graph_pause, 0);
                 atomic_set(&t->trace_overrun, 0);
+                t->ftrace_timestamp = 0;
         } else
                 t->ret_stack = NULL;
 }
diff --git a/kernel/trace/kmemtrace.c b/kernel/trace/kmemtrace.c
new file mode 100644
index 000000000000..5011f4d91e37
--- /dev/null
+++ b/kernel/trace/kmemtrace.c
@@ -0,0 +1,464 @@
+/*
+ * Memory allocator tracing
+ *
+ * Copyright (C) 2008 Eduard - Gabriel Munteanu
+ * Copyright (C) 2008 Pekka Enberg <penberg@cs.helsinki.fi>
+ * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ */
+
+#include <linux/tracepoint.h>
+#include <linux/seq_file.h>
+#include <linux/debugfs.h>
+#include <linux/dcache.h>
+#include <linux/fs.h>
+
+#include <trace/kmemtrace.h>
+
+#include "trace_output.h"
+#include "trace.h"
+
+/* Select an alternative, minimalistic output than the original one */
+#define TRACE_KMEM_OPT_MINIMAL  0x1
+
+static struct tracer_opt kmem_opts[] = {
+        /* Default disable the minimalistic output */
+        { TRACER_OPT(kmem_minimalistic, TRACE_KMEM_OPT_MINIMAL) },
+        { }
+};
+
+static struct tracer_flags kmem_tracer_flags = {
+        .val                    = 0,
+        .opts                   = kmem_opts
+};
+
+static struct trace_array *kmemtrace_array;
+
+/* Trace allocations */
+static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
+                                   unsigned long call_site,
+                                   const void *ptr,
+                                   size_t bytes_req,
+                                   size_t bytes_alloc,
+                                   gfp_t gfp_flags,
+                                   int node)
+{
+        struct trace_array *tr = kmemtrace_array;
+        struct kmemtrace_alloc_entry *entry;
+        struct ring_buffer_event *event;
+
+        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
+        if (!event)
+                return;
+
+        entry = ring_buffer_event_data(event);
+        tracing_generic_entry_update(&entry->ent, 0, 0);
+
+        entry->ent.type         = TRACE_KMEM_ALLOC;
+        entry->type_id          = type_id;
+        entry->call_site        = call_site;
+        entry->ptr              = ptr;
+        entry->bytes_req        = bytes_req;
+        entry->bytes_alloc      = bytes_alloc;
+        entry->gfp_flags        = gfp_flags;
+        entry->node             = node;
+
+        ring_buffer_unlock_commit(tr->buffer, event);
+
+        trace_wake_up();
+}
+
+static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
+                                  unsigned long call_site,
+                                  const void *ptr)
+{
+        struct trace_array *tr = kmemtrace_array;
+        struct kmemtrace_free_entry *entry;
+        struct ring_buffer_event *event;
+
+        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
+        if (!event)
+                return;
+        entry   = ring_buffer_event_data(event);
+        tracing_generic_entry_update(&entry->ent, 0, 0);
+
+        entry->ent.type         = TRACE_KMEM_FREE;
+        entry->type_id          = type_id;
+        entry->call_site        = call_site;
+        entry->ptr              = ptr;
+
+        ring_buffer_unlock_commit(tr->buffer, event);
+
+        trace_wake_up();
+}
+
+static void kmemtrace_kmalloc(unsigned long call_site,
+                              const void *ptr,
+                              size_t bytes_req,
+                              size_t bytes_alloc,
+                              gfp_t gfp_flags)
+{
+        kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
+                        bytes_req, bytes_alloc, gfp_flags, -1);
+}
+
+static void kmemtrace_kmem_cache_alloc(unsigned long call_site,
+                                       const void *ptr,
+                                       size_t bytes_req,
+                                       size_t bytes_alloc,
+                                       gfp_t gfp_flags)
+{
+        kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
+                        bytes_req, bytes_alloc, gfp_flags, -1);
+}
+
+static void kmemtrace_kmalloc_node(unsigned long call_site,
+                                   const void *ptr,
+                                   size_t bytes_req,
+                                   size_t bytes_alloc,
+                                   gfp_t gfp_flags,
+                                   int node)
+{
+        kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
+                        bytes_req, bytes_alloc, gfp_flags, node);
+}
+
+static void kmemtrace_kmem_cache_alloc_node(unsigned long call_site,
+                                            const void *ptr,
+                                            size_t bytes_req,
+                                            size_t bytes_alloc,
+                                            gfp_t gfp_flags,
+                                            int node)
+{
+        kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
+                        bytes_req, bytes_alloc, gfp_flags, node);
+}
+
+static void kmemtrace_kfree(unsigned long call_site, const void *ptr)
+{
+        kmemtrace_free(KMEMTRACE_TYPE_KMALLOC, call_site, ptr);
+}
+
+static void kmemtrace_kmem_cache_free(unsigned long call_site, const void *ptr)
+{
+        kmemtrace_free(KMEMTRACE_TYPE_CACHE, call_site, ptr);
+}
+
+static int kmemtrace_start_probes(void)
+{
+        int err;
+
+        err = register_trace_kmalloc(kmemtrace_kmalloc);
+        if (err)
+                return err;
+        err = register_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc);
+        if (err)
+                return err;
+        err = register_trace_kmalloc_node(kmemtrace_kmalloc_node);
+        if (err)
+                return err;
+        err = register_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node);
+        if (err)
+                return err;
+        err = register_trace_kfree(kmemtrace_kfree);
+        if (err)
+                return err;
+        err = register_trace_kmem_cache_free(kmemtrace_kmem_cache_free);
+
+        return err;
+}
+
+static void kmemtrace_stop_probes(void)
+{
+        unregister_trace_kmalloc(kmemtrace_kmalloc);
+        unregister_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc);
+        unregister_trace_kmalloc_node(kmemtrace_kmalloc_node);
+        unregister_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node);
+        unregister_trace_kfree(kmemtrace_kfree);
+        unregister_trace_kmem_cache_free(kmemtrace_kmem_cache_free);
+}
+
+static int kmem_trace_init(struct trace_array *tr)
+{
+        int cpu;
+        kmemtrace_array = tr;
+
+        for_each_cpu_mask(cpu, cpu_possible_map)
+                tracing_reset(tr, cpu);
+
+        kmemtrace_start_probes();
+
+        return 0;
+}
+
+static void kmem_trace_reset(struct trace_array *tr)
+{
+        kmemtrace_stop_probes();
+}
+
+static void kmemtrace_headers(struct seq_file *s)
+{
+        /* Don't need headers for the original kmemtrace output */
+        if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
+                return;
+
+        seq_printf(s, "#\n");
+        seq_printf(s, "# ALLOC  TYPE  REQ   GIVEN  FLAGS     "
+                        "      POINTER         NODE    CALLER\n");
+        seq_printf(s, "# FREE   |      |     |       |       "
+                        "       |   |            |        |\n");
+        seq_printf(s, "# |\n\n");
+}
+
+/*
+ * The following functions give the original output from kmemtrace,
+ * plus the origin CPU, since reordering occurs in-kernel now.
+ */
+
+#define KMEMTRACE_USER_ALLOC    0
+#define KMEMTRACE_USER_FREE     1
+
+struct kmemtrace_user_event {
+        u8                      event_id;
+        u8                      type_id;
+        u16                     event_size;
+        u32                     cpu;
+        u64                     timestamp;
+        unsigned long           call_site;
+        unsigned long           ptr;
+};
+
+struct kmemtrace_user_event_alloc {
+        size_t                  bytes_req;
+        size_t                  bytes_alloc;
+        unsigned                gfp_flags;
+        int                     node;
+};
+
+static enum print_line_t
+kmemtrace_print_alloc_user(struct trace_iterator *iter,
+                           struct kmemtrace_alloc_entry *entry)
+{
+        struct kmemtrace_user_event_alloc *ev_alloc;
+        struct trace_seq *s = &iter->seq;
+        struct kmemtrace_user_event *ev;
+
+        ev = trace_seq_reserve(s, sizeof(*ev));
+        if (!ev)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        ev->event_id            = KMEMTRACE_USER_ALLOC;
+        ev->type_id             = entry->type_id;
+        ev->event_size          = sizeof(*ev) + sizeof(*ev_alloc);
+        ev->cpu                 = iter->cpu;
+        ev->timestamp           = iter->ts;
+        ev->call_site           = entry->call_site;
+        ev->ptr                 = (unsigned long)entry->ptr;
+
+        ev_alloc = trace_seq_reserve(s, sizeof(*ev_alloc));
+        if (!ev_alloc)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        ev_alloc->bytes_req     = entry->bytes_req;
+        ev_alloc->bytes_alloc   = entry->bytes_alloc;
+        ev_alloc->gfp_flags     = entry->gfp_flags;
+        ev_alloc->node          = entry->node;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+kmemtrace_print_free_user(struct trace_iterator *iter,
+                          struct kmemtrace_free_entry *entry)
+{
+        struct trace_seq *s = &iter->seq;
+        struct kmemtrace_user_event *ev;
+
+        ev = trace_seq_reserve(s, sizeof(*ev));
+        if (!ev)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        ev->event_id            = KMEMTRACE_USER_FREE;
+        ev->type_id             = entry->type_id;
+        ev->event_size          = sizeof(*ev);
+        ev->cpu                 = iter->cpu;
+        ev->timestamp           = iter->ts;
+        ev->call_site           = entry->call_site;
+        ev->ptr                 = (unsigned long)entry->ptr;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+/* The two other following provide a more minimalistic output */
+static enum print_line_t
+kmemtrace_print_alloc_compress(struct trace_iterator *iter,
+                                        struct kmemtrace_alloc_entry *entry)
+{
+        struct trace_seq *s = &iter->seq;
+        int ret;
+
+        /* Alloc entry */
+        ret = trace_seq_printf(s, "  +      ");
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Type */
+        switch (entry->type_id) {
+        case KMEMTRACE_TYPE_KMALLOC:
+                ret = trace_seq_printf(s, "K   ");
+                break;
+        case KMEMTRACE_TYPE_CACHE:
+                ret = trace_seq_printf(s, "C   ");
+                break;
+        case KMEMTRACE_TYPE_PAGES:
+                ret = trace_seq_printf(s, "P   ");
+                break;
+        default:
+                ret = trace_seq_printf(s, "?   ");
+        }
+
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Requested */
+        ret = trace_seq_printf(s, "%4zu   ", entry->bytes_req);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Allocated */
+        ret = trace_seq_printf(s, "%4zu   ", entry->bytes_alloc);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Flags
+         * TODO: would be better to see the name of the GFP flag names
+         */
+        ret = trace_seq_printf(s, "%08x   ", entry->gfp_flags);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Pointer to allocated */
+        ret = trace_seq_printf(s, "0x%tx   ", (ptrdiff_t)entry->ptr);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Node */
+        ret = trace_seq_printf(s, "%4d   ", entry->node);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Call site */
+        ret = seq_print_ip_sym(s, entry->call_site, 0);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        if (!trace_seq_printf(s, "\n"))
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+kmemtrace_print_free_compress(struct trace_iterator *iter,
+                              struct kmemtrace_free_entry *entry)
+{
+        struct trace_seq *s = &iter->seq;
+        int ret;
+
+        /* Free entry */
+        ret = trace_seq_printf(s, "  -      ");
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Type */
+        switch (entry->type_id) {
+        case KMEMTRACE_TYPE_KMALLOC:
+                ret = trace_seq_printf(s, "K     ");
+                break;
+        case KMEMTRACE_TYPE_CACHE:
+                ret = trace_seq_printf(s, "C     ");
+                break;
+        case KMEMTRACE_TYPE_PAGES:
+                ret = trace_seq_printf(s, "P     ");
+                break;
+        default:
+                ret = trace_seq_printf(s, "?     ");
+        }
+
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Skip requested/allocated/flags */
+        ret = trace_seq_printf(s, "                       ");
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Pointer to allocated */
+        ret = trace_seq_printf(s, "0x%tx   ", (ptrdiff_t)entry->ptr);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Skip node */
+        ret = trace_seq_printf(s, "       ");
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Call site */
+        ret = seq_print_ip_sym(s, entry->call_site, 0);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        if (!trace_seq_printf(s, "\n"))
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
+{
+        struct trace_entry *entry = iter->ent;
+
+        switch (entry->type) {
+        case TRACE_KMEM_ALLOC: {
+                struct kmemtrace_alloc_entry *field;
+
+                trace_assign_type(field, entry);
+                if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
+                        return kmemtrace_print_alloc_compress(iter, field);
+                else
+                        return kmemtrace_print_alloc_user(iter, field);
+        }
+
+        case TRACE_KMEM_FREE: {
+                struct kmemtrace_free_entry *field;
+
+                trace_assign_type(field, entry);
+                if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
+                        return kmemtrace_print_free_compress(iter, field);
+                else
+                        return kmemtrace_print_free_user(iter, field);
+        }
+
+        default:
+                return TRACE_TYPE_UNHANDLED;
+        }
+}
+
+static struct tracer kmem_tracer __read_mostly = {
+        .name                   = "kmemtrace",
+        .init                   = kmem_trace_init,
+        .reset                  = kmem_trace_reset,
+        .print_line             = kmemtrace_print_line,
+        .print_header           = kmemtrace_headers,
+        .flags                  = &kmem_tracer_flags
+};
+
+void kmemtrace_init(void)
+{
+        /* earliest opportunity to start kmem tracing */
+}
+
+static int __init init_kmem_tracer(void)
+{
+        return register_tracer(&kmem_tracer);
+}
+device_initcall(init_kmem_tracer);
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index bd38c5cfd8ad..960cbf44c844 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -4,21 +4,92 @@
  * Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com>
  */
 #include <linux/ring_buffer.h>
+#include <linux/trace_clock.h>
+#include <linux/ftrace_irq.h>
 #include <linux/spinlock.h>
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
+#include <linux/hardirq.h>
 #include <linux/module.h>
 #include <linux/percpu.h>
 #include <linux/mutex.h>
-#include <linux/sched.h>        /* used for sched_clock() (for now) */
 #include <linux/init.h>
 #include <linux/hash.h>
 #include <linux/list.h>
+#include <linux/cpu.h>
 #include <linux/fs.h>
 
 #include "trace.h"
 
 /*
+ * The ring buffer is made up of a list of pages. A separate list of pages is
+ * allocated for each CPU. A writer may only write to a buffer that is
+ * associated with the CPU it is currently executing on.  A reader may read
+ * from any per cpu buffer.
+ *
+ * The reader is special. For each per cpu buffer, the reader has its own
+ * reader page. When a reader has read the entire reader page, this reader
+ * page is swapped with another page in the ring buffer.
+ *
+ * Now, as long as the writer is off the reader page, the reader can do what
+ * ever it wants with that page. The writer will never write to that page
+ * again (as long as it is out of the ring buffer).
+ *
+ * Here's some silly ASCII art.
+ *
+ *   +------+
+ *   |reader|          RING BUFFER
+ *   |page  |
+ *   +------+        +---+   +---+   +---+
+ *                   |   |-->|   |-->|   |
+ *                   +---+   +---+   +---+
+ *                     ^               |
+ *                     |               |
+ *                     +---------------+
+ *
+ *
+ *   +------+
+ *   |reader|          RING BUFFER
+ *   |page  |------------------v
+ *   +------+        +---+   +---+   +---+
+ *                   |   |-->|   |-->|   |
+ *                   +---+   +---+   +---+
+ *                     ^               |
+ *                     |               |
+ *                     +---------------+
+ *
+ *
+ *   +------+
+ *   |reader|          RING BUFFER
+ *   |page  |------------------v
+ *   +------+        +---+   +---+   +---+
+ *      ^            |   |-->|   |-->|   |
+ *      |            +---+   +---+   +---+
+ *      |                              |
+ *      |                              |
+ *      +------------------------------+
+ *
+ *
+ *   +------+
+ *   |buffer|          RING BUFFER
+ *   |page  |------------------v
+ *   +------+        +---+   +---+   +---+
+ *      ^            |   |   |   |-->|   |
+ *      |   New      +---+   +---+   +---+
+ *      |  Reader------^               |
+ *      |   page                       |
+ *      +------------------------------+
+ *
+ *
+ * After we make this swap, the reader can hand this page off to the splice
+ * code and be done with it. It can even allocate a new page if it needs to
+ * and swap that into the ring buffer.
+ *
+ * We will be using cmpxchg soon to make all this lockless.
+ *
+ */
+
+/*
  * A fast way to enable or disable all ring buffers is to
  * call tracing_on or tracing_off. Turning off the ring buffers
  * prevents all ring buffers from being recorded to.
@@ -57,7 +128,9 @@ enum {
         RB_BUFFERS_DISABLED     = 1 << RB_BUFFERS_DISABLED_BIT,
 };
 
-static long ring_buffer_flags __read_mostly = RB_BUFFERS_ON;
+static unsigned long ring_buffer_flags __read_mostly = RB_BUFFERS_ON;
+
+#define BUF_PAGE_HDR_SIZE offsetof(struct buffer_data_page, data)
 
 /**
  * tracing_on - enable all tracing buffers
@@ -89,59 +162,92 @@ EXPORT_SYMBOL_GPL(tracing_off);
  * tracing_off_permanent - permanently disable ring buffers
  *
  * This function, once called, will disable all ring buffers
- * permanenty.
+ * permanently.
  */
 void tracing_off_permanent(void)
 {
         set_bit(RB_BUFFERS_DISABLED_BIT, &ring_buffer_flags);
 }
 
+/**
+ * tracing_is_on - show state of ring buffers enabled
+ */
+int tracing_is_on(void)
+{
+        return ring_buffer_flags == RB_BUFFERS_ON;
+}
+EXPORT_SYMBOL_GPL(tracing_is_on);
+
 #include "trace.h"
 
-/* Up this if you want to test the TIME_EXTENTS and normalization */
-#define DEBUG_SHIFT 0
+#define RB_EVNT_HDR_SIZE (offsetof(struct ring_buffer_event, array))
+#define RB_ALIGNMENT            4U
+#define RB_MAX_SMALL_DATA       28
+
+enum {
+        RB_LEN_TIME_EXTEND = 8,
+        RB_LEN_TIME_STAMP = 16,
+};
 
-/* FIXME!!! */
-u64 ring_buffer_time_stamp(int cpu)
+static inline int rb_null_event(struct ring_buffer_event *event)
 {
-        u64 time;
+        return event->type == RINGBUF_TYPE_PADDING && event->time_delta == 0;
+}
 
-        preempt_disable_notrace();
-        /* shift to debug/test normalization and TIME_EXTENTS */
-        time = sched_clock() << DEBUG_SHIFT;
-        preempt_enable_no_resched_notrace();
+static inline int rb_discarded_event(struct ring_buffer_event *event)
+{
+        return event->type == RINGBUF_TYPE_PADDING && event->time_delta;
+}
 
-        return time;
+static void rb_event_set_padding(struct ring_buffer_event *event)
+{
+        event->type = RINGBUF_TYPE_PADDING;
+        event->time_delta = 0;
 }
-EXPORT_SYMBOL_GPL(ring_buffer_time_stamp);
 
-void ring_buffer_normalize_time_stamp(int cpu, u64 *ts)
+/**
+ * ring_buffer_event_discard - discard an event in the ring buffer
+ * @buffer: the ring buffer
+ * @event: the event to discard
+ *
+ * Sometimes a event that is in the ring buffer needs to be ignored.
+ * This function lets the user discard an event in the ring buffer
+ * and then that event will not be read later.
+ *
+ * Note, it is up to the user to be careful with this, and protect
+ * against races. If the user discards an event that has been consumed
+ * it is possible that it could corrupt the ring buffer.
+ */
+void ring_buffer_event_discard(struct ring_buffer_event *event)
 {
-        /* Just stupid testing the normalize function and deltas */
-        *ts >>= DEBUG_SHIFT;
+        event->type = RINGBUF_TYPE_PADDING;
+        /* time delta must be non zero */
+        if (!event->time_delta)
+                event->time_delta = 1;
 }
-EXPORT_SYMBOL_GPL(ring_buffer_normalize_time_stamp);
 
-#define RB_EVNT_HDR_SIZE (sizeof(struct ring_buffer_event))
-#define RB_ALIGNMENT_SHIFT      2
-#define RB_ALIGNMENT            (1 << RB_ALIGNMENT_SHIFT)
-#define RB_MAX_SMALL_DATA       28
+static unsigned
+rb_event_data_length(struct ring_buffer_event *event)
+{
+        unsigned length;
 
-enum {
-        RB_LEN_TIME_EXTEND = 8,
-        RB_LEN_TIME_STAMP = 16,
-};
+        if (event->len)
+                length = event->len * RB_ALIGNMENT;
+        else
+                length = event->array[0];
+        return length + RB_EVNT_HDR_SIZE;
+}
 
 /* inline for ring buffer fast paths */
-static inline unsigned
+static unsigned
 rb_event_length(struct ring_buffer_event *event)
 {
-        unsigned length;
-
         switch (event->type) {
         case RINGBUF_TYPE_PADDING:
-                /* undefined */
-                return -1;
+                if (rb_null_event(event))
+                        /* undefined */
+                        return -1;
+                return rb_event_data_length(event);
 
         case RINGBUF_TYPE_TIME_EXTEND:
                 return RB_LEN_TIME_EXTEND;
@@ -150,11 +256,7 @@ rb_event_length(struct ring_buffer_event *event)
                 return RB_LEN_TIME_STAMP;
 
         case RINGBUF_TYPE_DATA:
-                if (event->len)
-                        length = event->len << RB_ALIGNMENT_SHIFT;
-                else
-                        length = event->array[0];
-                return length + RB_EVNT_HDR_SIZE;
+                return rb_event_data_length(event);
         default:
                 BUG();
         }
@@ -179,7 +281,7 @@ unsigned ring_buffer_event_length(struct ring_buffer_event *event)
 EXPORT_SYMBOL_GPL(ring_buffer_event_length);
 
 /* inline for ring buffer fast paths */
-static inline void *
+static void *
 rb_event_data(struct ring_buffer_event *event)
 {
         BUG_ON(event->type != RINGBUF_TYPE_DATA);
@@ -209,7 +311,7 @@ EXPORT_SYMBOL_GPL(ring_buffer_event_data);
 
 struct buffer_data_page {
         u64              time_stamp;    /* page time stamp */
-        local_t          commit;        /* write commited index */
+        local_t          commit;        /* write committed index */
         unsigned char    data[];        /* data of buffer page */
 };
 
@@ -225,14 +327,25 @@ static void rb_init_page(struct buffer_data_page *bpage)
         local_set(&bpage->commit, 0);
 }
 
+/**
+ * ring_buffer_page_len - the size of data on the page.
+ * @page: The page to read
+ *
+ * Returns the amount of data on the page, including buffer page header.
+ */
+size_t ring_buffer_page_len(void *page)
+{
+        return local_read(&((struct buffer_data_page *)page)->commit)
+                + BUF_PAGE_HDR_SIZE;
+}
+
 /*
  * Also stolen from mm/slob.c. Thanks to Mathieu Desnoyers for pointing
  * this issue out.
  */
-static inline void free_buffer_page(struct buffer_page *bpage)
+static void free_buffer_page(struct buffer_page *bpage)
 {
-        if (bpage->page)
-                free_page((unsigned long)bpage->page);
+        free_page((unsigned long)bpage->page);
         kfree(bpage);
 }
 
@@ -246,7 +359,7 @@ static inline int test_time_stamp(u64 delta)
         return 0;
 }
 
-#define BUF_PAGE_SIZE (PAGE_SIZE - offsetof(struct buffer_data_page, data))
+#define BUF_PAGE_SIZE (PAGE_SIZE - BUF_PAGE_HDR_SIZE)
 
 /*
  * head_page == tail_page && head == tail then buffer is empty.
@@ -260,7 +373,7 @@ struct ring_buffer_per_cpu {
         struct list_head                pages;
         struct buffer_page              *head_page;     /* read from head */
         struct buffer_page              *tail_page;     /* write to tail */
-        struct buffer_page              *commit_page;   /* commited pages */
+        struct buffer_page              *commit_page;   /* committed pages */
         struct buffer_page              *reader_page;
         unsigned long                   overrun;
         unsigned long                   entries;
@@ -273,12 +386,17 @@ struct ring_buffer {
         unsigned                        pages;
         unsigned                        flags;
         int                             cpus;
-        cpumask_var_t                   cpumask;
         atomic_t                        record_disabled;
+        cpumask_var_t                   cpumask;
 
         struct mutex                    mutex;
 
         struct ring_buffer_per_cpu      **buffers;
+
+#ifdef CONFIG_HOTPLUG_CPU
+        struct notifier_block           cpu_notify;
+#endif
+        u64                             (*clock)(void);
 };
 
 struct ring_buffer_iter {
@@ -299,11 +417,35 @@ struct ring_buffer_iter {
                 _____ret;                                       \
         })
 
+/* Up this if you want to test the TIME_EXTENTS and normalization */
+#define DEBUG_SHIFT 0
+
+u64 ring_buffer_time_stamp(struct ring_buffer *buffer, int cpu)
+{
+        u64 time;
+
+        preempt_disable_notrace();
+        /* shift to debug/test normalization and TIME_EXTENTS */
+        time = buffer->clock() << DEBUG_SHIFT;
+        preempt_enable_no_resched_notrace();
+
+        return time;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_time_stamp);
+
+void ring_buffer_normalize_time_stamp(struct ring_buffer *buffer,
+                                      int cpu, u64 *ts)
+{
+        /* Just stupid testing the normalize function and deltas */
+        *ts >>= DEBUG_SHIFT;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_normalize_time_stamp);
+
 /**
  * check_pages - integrity check of buffer pages
  * @cpu_buffer: CPU buffer with pages to test
  *
- * As a safty measure we check to make sure the data pages have not
+ * As a safety measure we check to make sure the data pages have not
  * been corrupted.
  */
 static int rb_check_pages(struct ring_buffer_per_cpu *cpu_buffer)
@@ -421,7 +563,6 @@ static void rb_free_cpu_buffer(struct ring_buffer_per_cpu *cpu_buffer)
         struct list_head *head = &cpu_buffer->pages;
         struct buffer_page *bpage, *tmp;
 
-        list_del_init(&cpu_buffer->reader_page->list);
         free_buffer_page(cpu_buffer->reader_page);
 
         list_for_each_entry_safe(bpage, tmp, head, list) {
@@ -437,6 +578,11 @@ static void rb_free_cpu_buffer(struct ring_buffer_per_cpu *cpu_buffer)
  */
 extern int ring_buffer_page_too_big(void);
 
+#ifdef CONFIG_HOTPLUG_CPU
+static int rb_cpu_notify(struct notifier_block *self,
+                         unsigned long action, void *hcpu);
+#endif
+
 /**
  * ring_buffer_alloc - allocate a new ring_buffer
  * @size: the size in bytes per cpu that is needed.
@@ -469,12 +615,23 @@ struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
 
         buffer->pages = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
         buffer->flags = flags;
+        buffer->clock = trace_clock_local;
 
         /* need at least two pages */
         if (buffer->pages == 1)
                 buffer->pages++;
 
+        /*
+         * In case of non-hotplug cpu, if the ring-buffer is allocated
+         * in early initcall, it will not be notified of secondary cpus.
+         * In that off case, we need to allocate for all possible cpus.
+         */
+#ifdef CONFIG_HOTPLUG_CPU
+        get_online_cpus();
+        cpumask_copy(buffer->cpumask, cpu_online_mask);
+#else
         cpumask_copy(buffer->cpumask, cpu_possible_mask);
+#endif
         buffer->cpus = nr_cpu_ids;
 
         bsize = sizeof(void *) * nr_cpu_ids;
@@ -490,6 +647,13 @@ struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
                         goto fail_free_buffers;
         }
 
+#ifdef CONFIG_HOTPLUG_CPU
+        buffer->cpu_notify.notifier_call = rb_cpu_notify;
+        buffer->cpu_notify.priority = 0;
+        register_cpu_notifier(&buffer->cpu_notify);
+#endif
+
+        put_online_cpus();
         mutex_init(&buffer->mutex);
 
         return buffer;
@@ -503,6 +667,7 @@ struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
 
  fail_free_cpumask:
         free_cpumask_var(buffer->cpumask);
+        put_online_cpus();
 
  fail_free_buffer:
         kfree(buffer);
@@ -519,15 +684,29 @@ ring_buffer_free(struct ring_buffer *buffer)
 {
         int cpu;
 
+        get_online_cpus();
+
+#ifdef CONFIG_HOTPLUG_CPU
+        unregister_cpu_notifier(&buffer->cpu_notify);
+#endif
+
         for_each_buffer_cpu(buffer, cpu)
                 rb_free_cpu_buffer(buffer->buffers[cpu]);
 
+        put_online_cpus();
+
         free_cpumask_var(buffer->cpumask);
 
         kfree(buffer);
 }
 EXPORT_SYMBOL_GPL(ring_buffer_free);
 
+void ring_buffer_set_clock(struct ring_buffer *buffer,
+                           u64 (*clock)(void))
+{
+        buffer->clock = clock;
+}
+
 static void rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer);
 
 static void
@@ -627,16 +806,15 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
                 return size;
 
         mutex_lock(&buffer->mutex);
+        get_online_cpus();
 
         nr_pages = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
 
         if (size < buffer_size) {
 
                 /* easy case, just free pages */
-                if (RB_WARN_ON(buffer, nr_pages >= buffer->pages)) {
-                        mutex_unlock(&buffer->mutex);
-                        return -1;
-                }
+                if (RB_WARN_ON(buffer, nr_pages >= buffer->pages))
+                        goto out_fail;
 
                 rm_pages = buffer->pages - nr_pages;
 
@@ -655,10 +833,8 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
          * add these pages to the cpu_buffers. Otherwise we just free
          * them all and return -ENOMEM;
          */
-        if (RB_WARN_ON(buffer, nr_pages <= buffer->pages)) {
-                mutex_unlock(&buffer->mutex);
-                return -1;
-        }
+        if (RB_WARN_ON(buffer, nr_pages <= buffer->pages))
+                goto out_fail;
 
         new_pages = nr_pages - buffer->pages;
 
@@ -683,13 +859,12 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
                 rb_insert_pages(cpu_buffer, &pages, new_pages);
         }
 
-        if (RB_WARN_ON(buffer, !list_empty(&pages))) {
-                mutex_unlock(&buffer->mutex);
-                return -1;
-        }
+        if (RB_WARN_ON(buffer, !list_empty(&pages)))
+                goto out_fail;
 
  out:
         buffer->pages = nr_pages;
+        put_online_cpus();
         mutex_unlock(&buffer->mutex);
 
         return size;
@@ -699,15 +874,20 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
                 list_del_init(&bpage->list);
                 free_buffer_page(bpage);
         }
+        put_online_cpus();
         mutex_unlock(&buffer->mutex);
         return -ENOMEM;
-}
-EXPORT_SYMBOL_GPL(ring_buffer_resize);
 
-static inline int rb_null_event(struct ring_buffer_event *event)
-{
-        return event->type == RINGBUF_TYPE_PADDING;
+        /*
+         * Something went totally wrong, and we are too paranoid
+         * to even clean up the mess.
+         */
+ out_fail:
+        put_online_cpus();
+        mutex_unlock(&buffer->mutex);
+        return -1;
 }
+EXPORT_SYMBOL_GPL(ring_buffer_resize);
 
 static inline void *
 __rb_data_page_index(struct buffer_data_page *bpage, unsigned index)
@@ -811,7 +991,7 @@ rb_event_index(struct ring_buffer_event *event)
         return (addr & ~PAGE_MASK) - (PAGE_SIZE - BUF_PAGE_SIZE);
 }
 
-static inline int
+static int
 rb_is_commit(struct ring_buffer_per_cpu *cpu_buffer,
              struct ring_buffer_event *event)
 {
@@ -825,7 +1005,7 @@ rb_is_commit(struct ring_buffer_per_cpu *cpu_buffer,
                 rb_commit_index(cpu_buffer) == index;
 }
 
-static inline void
+static void
 rb_set_commit_event(struct ring_buffer_per_cpu *cpu_buffer,
                     struct ring_buffer_event *event)
 {
@@ -850,7 +1030,7 @@ rb_set_commit_event(struct ring_buffer_per_cpu *cpu_buffer,
         local_set(&cpu_buffer->commit_page->page->commit, index);
 }
 
-static inline void
+static void
 rb_set_commit_to_write(struct ring_buffer_per_cpu *cpu_buffer)
 {
         /*
@@ -896,7 +1076,7 @@ static void rb_reset_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
         cpu_buffer->reader_page->read = 0;
 }
 
-static inline void rb_inc_iter(struct ring_buffer_iter *iter)
+static void rb_inc_iter(struct ring_buffer_iter *iter)
 {
         struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
 
@@ -926,7 +1106,7 @@ static inline void rb_inc_iter(struct ring_buffer_iter *iter)
  * and with this, we can determine what to place into the
  * data field.
  */
-static inline void
+static void
 rb_update_event(struct ring_buffer_event *event,
                          unsigned type, unsigned length)
 {
@@ -938,15 +1118,11 @@ rb_update_event(struct ring_buffer_event *event,
                 break;
 
         case RINGBUF_TYPE_TIME_EXTEND:
-                event->len =
-                        (RB_LEN_TIME_EXTEND + (RB_ALIGNMENT-1))
-                        >> RB_ALIGNMENT_SHIFT;
+                event->len = DIV_ROUND_UP(RB_LEN_TIME_EXTEND, RB_ALIGNMENT);
                 break;
 
         case RINGBUF_TYPE_TIME_STAMP:
-                event->len =
-                        (RB_LEN_TIME_STAMP + (RB_ALIGNMENT-1))
-                        >> RB_ALIGNMENT_SHIFT;
+                event->len = DIV_ROUND_UP(RB_LEN_TIME_STAMP, RB_ALIGNMENT);
                 break;
 
         case RINGBUF_TYPE_DATA:
@@ -955,16 +1131,14 @@ rb_update_event(struct ring_buffer_event *event,
                         event->len = 0;
                         event->array[0] = length;
                 } else
-                        event->len =
-                                (length + (RB_ALIGNMENT-1))
-                                >> RB_ALIGNMENT_SHIFT;
+                        event->len = DIV_ROUND_UP(length, RB_ALIGNMENT);
                 break;
         default:
                 BUG();
         }
 }
 
-static inline unsigned rb_calculate_event_length(unsigned length)
+static unsigned rb_calculate_event_length(unsigned length)
 {
         struct ring_buffer_event event; /* Used only for sizeof array */
 
@@ -990,6 +1164,7 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
         struct ring_buffer *buffer = cpu_buffer->buffer;
         struct ring_buffer_event *event;
         unsigned long flags;
+        bool lock_taken = false;
 
         commit_page = cpu_buffer->commit_page;
         /* we just need to protect against interrupts */
@@ -1003,7 +1178,30 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
                 struct buffer_page *next_page = tail_page;
 
                 local_irq_save(flags);
-                __raw_spin_lock(&cpu_buffer->lock);
+                /*
+                 * Since the write to the buffer is still not
+                 * fully lockless, we must be careful with NMIs.
+                 * The locks in the writers are taken when a write
+                 * crosses to a new page. The locks protect against
+                 * races with the readers (this will soon be fixed
+                 * with a lockless solution).
+                 *
+                 * Because we can not protect against NMIs, and we
+                 * want to keep traces reentrant, we need to manage
+                 * what happens when we are in an NMI.
+                 *
+                 * NMIs can happen after we take the lock.
+                 * If we are in an NMI, only take the lock
+                 * if it is not already taken. Otherwise
+                 * simply fail.
+                 */
+                if (unlikely(in_nmi())) {
+                        if (!__raw_spin_trylock(&cpu_buffer->lock))
+                                goto out_reset;
+                } else
+                        __raw_spin_lock(&cpu_buffer->lock);
+
+                lock_taken = true;
 
                 rb_inc_page(cpu_buffer, &next_page);
 
@@ -1012,7 +1210,7 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
 
                 /* we grabbed the lock before incrementing */
                 if (RB_WARN_ON(cpu_buffer, next_page == reader_page))
-                        goto out_unlock;
+                        goto out_reset;
 
                 /*
                  * If for some reason, we had an interrupt storm that made
@@ -1021,12 +1219,12 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
                  */
                 if (unlikely(next_page == commit_page)) {
                         WARN_ON_ONCE(1);
-                        goto out_unlock;
+                        goto out_reset;
                 }
 
                 if (next_page == head_page) {
                         if (!(buffer->flags & RB_FL_OVERWRITE))
-                                goto out_unlock;
+                                goto out_reset;
 
                         /* tail_page has not moved yet? */
                         if (tail_page == cpu_buffer->tail_page) {
@@ -1050,7 +1248,7 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
                         cpu_buffer->tail_page = next_page;
 
                         /* reread the time stamp */
-                        *ts = ring_buffer_time_stamp(cpu_buffer->cpu);
+                        *ts = ring_buffer_time_stamp(buffer, cpu_buffer->cpu);
                         cpu_buffer->tail_page->page->time_stamp = *ts;
                 }
 
@@ -1060,7 +1258,7 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
                 if (tail < BUF_PAGE_SIZE) {
                         /* Mark the rest of the page with padding */
                         event = __rb_page_index(tail_page, tail);
-                        event->type = RINGBUF_TYPE_PADDING;
+                        rb_event_set_padding(event);
                 }
 
                 if (tail <= BUF_PAGE_SIZE)
@@ -1100,12 +1298,13 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
 
         return event;
 
- out_unlock:
+ out_reset:
         /* reset write */
         if (tail <= BUF_PAGE_SIZE)
                 local_set(&tail_page->write, tail);
 
-        __raw_spin_unlock(&cpu_buffer->lock);
+        if (likely(lock_taken))
+                __raw_spin_unlock(&cpu_buffer->lock);
         local_irq_restore(flags);
         return NULL;
 }
@@ -1192,7 +1391,7 @@ rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
         if (RB_WARN_ON(cpu_buffer, ++nr_loops > 1000))
                 return NULL;
 
-        ts = ring_buffer_time_stamp(cpu_buffer->cpu);
+        ts = ring_buffer_time_stamp(cpu_buffer->buffer, cpu_buffer->cpu);
 
         /*
          * Only the first commit can update the timestamp.
@@ -1265,7 +1464,6 @@ static DEFINE_PER_CPU(int, rb_need_resched);
  * ring_buffer_lock_reserve - reserve a part of the buffer
  * @buffer: the ring buffer to reserve from
  * @length: the length of the data to reserve (excluding event header)
- * @flags: a pointer to save the interrupt flags
  *
  * Returns a reseverd event on the ring buffer to copy directly to.
  * The user of this interface will need to get the body to write into
@@ -1278,9 +1476,7 @@ static DEFINE_PER_CPU(int, rb_need_resched);
  * If NULL is returned, then nothing has been allocated or locked.
  */
 struct ring_buffer_event *
-ring_buffer_lock_reserve(struct ring_buffer *buffer,
-                         unsigned long length,
-                         unsigned long *flags)
+ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
 {
         struct ring_buffer_per_cpu *cpu_buffer;
         struct ring_buffer_event *event;
@@ -1347,15 +1543,13 @@ static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer,
  * ring_buffer_unlock_commit - commit a reserved
  * @buffer: The buffer to commit to
  * @event: The event pointer to commit.
- * @flags: the interrupt flags received from ring_buffer_lock_reserve.
  *
  * This commits the data to the ring buffer, and releases any locks held.
  *
  * Must be paired with ring_buffer_lock_reserve.
  */
 int ring_buffer_unlock_commit(struct ring_buffer *buffer,
-                              struct ring_buffer_event *event,
-                              unsigned long flags)
+                              struct ring_buffer_event *event)
 {
         struct ring_buffer_per_cpu *cpu_buffer;
         int cpu = raw_smp_processor_id();
@@ -1438,7 +1632,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
 }
 EXPORT_SYMBOL_GPL(ring_buffer_write);
 
-static inline int rb_per_cpu_empty(struct ring_buffer_per_cpu *cpu_buffer)
+static int rb_per_cpu_empty(struct ring_buffer_per_cpu *cpu_buffer)
 {
         struct buffer_page *reader = cpu_buffer->reader_page;
         struct buffer_page *head = cpu_buffer->head_page;
@@ -1528,12 +1722,15 @@ EXPORT_SYMBOL_GPL(ring_buffer_record_enable_cpu);
 unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu)
 {
         struct ring_buffer_per_cpu *cpu_buffer;
+        unsigned long ret;
 
         if (!cpumask_test_cpu(cpu, buffer->cpumask))
                 return 0;
 
         cpu_buffer = buffer->buffers[cpu];
-        return cpu_buffer->entries;
+        ret = cpu_buffer->entries;
+
+        return ret;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_entries_cpu);
 
@@ -1545,12 +1742,15 @@ EXPORT_SYMBOL_GPL(ring_buffer_entries_cpu);
 unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu)
 {
         struct ring_buffer_per_cpu *cpu_buffer;
+        unsigned long ret;
 
         if (!cpumask_test_cpu(cpu, buffer->cpumask))
                 return 0;
 
         cpu_buffer = buffer->buffers[cpu];
-        return cpu_buffer->overrun;
+        ret = cpu_buffer->overrun;
+
+        return ret;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_overrun_cpu);
 
@@ -1627,9 +1827,14 @@ static void rb_iter_reset(struct ring_buffer_iter *iter)
  */
 void ring_buffer_iter_reset(struct ring_buffer_iter *iter)
 {
-        struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+        struct ring_buffer_per_cpu *cpu_buffer;
         unsigned long flags;
 
+        if (!iter)
+                return;
+
+        cpu_buffer = iter->cpu_buffer;
+
         spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
         rb_iter_reset(iter);
         spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
@@ -1803,7 +2008,7 @@ static void rb_advance_reader(struct ring_buffer_per_cpu *cpu_buffer)
 
         event = rb_reader_event(cpu_buffer);
 
-        if (event->type == RINGBUF_TYPE_DATA)
+        if (event->type == RINGBUF_TYPE_DATA || rb_discarded_event(event))
                 cpu_buffer->entries--;
 
         rb_update_read_stamp(cpu_buffer, event);
@@ -1864,9 +2069,6 @@ rb_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
         struct buffer_page *reader;
         int nr_loops = 0;
 
-        if (!cpumask_test_cpu(cpu, buffer->cpumask))
-                return NULL;
-
         cpu_buffer = buffer->buffers[cpu];
 
  again:
@@ -1889,9 +2091,18 @@ rb_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
 
         switch (event->type) {
         case RINGBUF_TYPE_PADDING:
-                RB_WARN_ON(cpu_buffer, 1);
+                if (rb_null_event(event))
+                        RB_WARN_ON(cpu_buffer, 1);
+                /*
+                 * Because the writer could be discarding every
+                 * event it creates (which would probably be bad)
+                 * if we were to go back to "again" then we may never
+                 * catch up, and will trigger the warn on, or lock
+                 * the box. Return the padding, and we will release
+                 * the current locks, and try again.
+                 */
                 rb_advance_reader(cpu_buffer);
-                return NULL;
+                return event;
 
         case RINGBUF_TYPE_TIME_EXTEND:
                 /* Internal data, OK to advance */
@@ -1906,7 +2117,8 @@ rb_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
         case RINGBUF_TYPE_DATA:
                 if (ts) {
                         *ts = cpu_buffer->read_stamp + event->time_delta;
-                        ring_buffer_normalize_time_stamp(cpu_buffer->cpu, ts);
+                        ring_buffer_normalize_time_stamp(buffer,
+                                                         cpu_buffer->cpu, ts);
                 }
                 return event;
 
@@ -1951,8 +2163,12 @@ rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
 
         switch (event->type) {
         case RINGBUF_TYPE_PADDING:
-                rb_inc_iter(iter);
-                goto again;
+                if (rb_null_event(event)) {
+                        rb_inc_iter(iter);
+                        goto again;
+                }
+                rb_advance_iter(iter);
+                return event;
 
         case RINGBUF_TYPE_TIME_EXTEND:
                 /* Internal data, OK to advance */
@@ -1967,7 +2183,8 @@ rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
         case RINGBUF_TYPE_DATA:
                 if (ts) {
                         *ts = iter->read_stamp + event->time_delta;
-                        ring_buffer_normalize_time_stamp(cpu_buffer->cpu, ts);
+                        ring_buffer_normalize_time_stamp(buffer,
+                                                         cpu_buffer->cpu, ts);
                 }
                 return event;
 
@@ -1995,10 +2212,19 @@ ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
         struct ring_buffer_event *event;
         unsigned long flags;
 
+        if (!cpumask_test_cpu(cpu, buffer->cpumask))
+                return NULL;
+
+ again:
         spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
         event = rb_buffer_peek(buffer, cpu, ts);
         spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 
+        if (event && event->type == RINGBUF_TYPE_PADDING) {
+                cpu_relax();
+                goto again;
+        }
+
         return event;
 }
 
@@ -2017,10 +2243,16 @@ ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
         struct ring_buffer_event *event;
         unsigned long flags;
 
+ again:
         spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
         event = rb_iter_peek(iter, ts);
         spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 
+        if (event && event->type == RINGBUF_TYPE_PADDING) {
+                cpu_relax();
+                goto again;
+        }
+
         return event;
 }
 
@@ -2035,24 +2267,37 @@ ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
 struct ring_buffer_event *
 ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)
 {
-        struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
-        struct ring_buffer_event *event;
+        struct ring_buffer_per_cpu *cpu_buffer;
+        struct ring_buffer_event *event = NULL;
         unsigned long flags;
 
+ again:
+        /* might be called in atomic */
+        preempt_disable();
+
         if (!cpumask_test_cpu(cpu, buffer->cpumask))
-                return NULL;
+                goto out;
 
+        cpu_buffer = buffer->buffers[cpu];
         spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
 
         event = rb_buffer_peek(buffer, cpu, ts);
         if (!event)
-                goto out;
+                goto out_unlock;
 
         rb_advance_reader(cpu_buffer);
 
- out:
+ out_unlock:
         spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 
+ out:
+        preempt_enable();
+
+        if (event && event->type == RINGBUF_TYPE_PADDING) {
+                cpu_relax();
+                goto again;
+        }
+
         return event;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_consume);
@@ -2131,6 +2376,7 @@ ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts)
         struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
         unsigned long flags;
 
+ again:
         spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
         event = rb_iter_peek(iter, ts);
         if (!event)
@@ -2140,6 +2386,11 @@ ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts)
  out:
         spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 
+        if (event && event->type == RINGBUF_TYPE_PADDING) {
+                cpu_relax();
+                goto again;
+        }
+
         return event;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_read);
@@ -2232,6 +2483,7 @@ int ring_buffer_empty(struct ring_buffer *buffer)
                 if (!rb_per_cpu_empty(cpu_buffer))
                         return 0;
         }
+
         return 1;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_empty);
@@ -2244,12 +2496,16 @@ EXPORT_SYMBOL_GPL(ring_buffer_empty);
 int ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu)
 {
         struct ring_buffer_per_cpu *cpu_buffer;
+        int ret;
 
         if (!cpumask_test_cpu(cpu, buffer->cpumask))
                 return 1;
 
         cpu_buffer = buffer->buffers[cpu];
-        return rb_per_cpu_empty(cpu_buffer);
+        ret = rb_per_cpu_empty(cpu_buffer);
+
+
+        return ret;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_empty_cpu);
 
@@ -2268,18 +2524,36 @@ int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
 {
         struct ring_buffer_per_cpu *cpu_buffer_a;
         struct ring_buffer_per_cpu *cpu_buffer_b;
+        int ret = -EINVAL;
 
         if (!cpumask_test_cpu(cpu, buffer_a->cpumask) ||
             !cpumask_test_cpu(cpu, buffer_b->cpumask))
-                return -EINVAL;
+                goto out;
 
         /* At least make sure the two buffers are somewhat the same */
         if (buffer_a->pages != buffer_b->pages)
-                return -EINVAL;
+                goto out;
+
+        ret = -EAGAIN;
+
+        if (ring_buffer_flags != RB_BUFFERS_ON)
+                goto out;
+
+        if (atomic_read(&buffer_a->record_disabled))
+                goto out;
+
+        if (atomic_read(&buffer_b->record_disabled))
+                goto out;
 
         cpu_buffer_a = buffer_a->buffers[cpu];
         cpu_buffer_b = buffer_b->buffers[cpu];
 
+        if (atomic_read(&cpu_buffer_a->record_disabled))
+                goto out;
+
+        if (atomic_read(&cpu_buffer_b->record_disabled))
+                goto out;
+
         /*
          * We can't do a synchronize_sched here because this
          * function can be called in atomic context.
@@ -2298,18 +2572,21 @@ int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
         atomic_dec(&cpu_buffer_a->record_disabled);
         atomic_dec(&cpu_buffer_b->record_disabled);
 
-        return 0;
+        ret = 0;
+out:
+        return ret;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_swap_cpu);
 
 static void rb_remove_entries(struct ring_buffer_per_cpu *cpu_buffer,
-                              struct buffer_data_page *bpage)
+                              struct buffer_data_page *bpage,
+                              unsigned int offset)
 {
         struct ring_buffer_event *event;
         unsigned long head;
 
         __raw_spin_lock(&cpu_buffer->lock);
-        for (head = 0; head < local_read(&bpage->commit);
+        for (head = offset; head < local_read(&bpage->commit);
              head += rb_event_length(event)) {
 
                 event = __rb_data_page_index(bpage, head);
@@ -2340,8 +2617,8 @@ static void rb_remove_entries(struct ring_buffer_per_cpu *cpu_buffer,
  */
 void *ring_buffer_alloc_read_page(struct ring_buffer *buffer)
 {
-        unsigned long addr;
         struct buffer_data_page *bpage;
+        unsigned long addr;
 
         addr = __get_free_page(GFP_KERNEL);
         if (!addr)
@@ -2349,6 +2626,8 @@ void *ring_buffer_alloc_read_page(struct ring_buffer *buffer)
 
         bpage = (void *)addr;
 
+        rb_init_page(bpage);
+
         return bpage;
 }
 
@@ -2368,6 +2647,7 @@ void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data)
  * ring_buffer_read_page - extract a page from the ring buffer
  * @buffer: buffer to extract from
  * @data_page: the page to use allocated from ring_buffer_alloc_read_page
+ * @len: amount to extract
  * @cpu: the cpu of the buffer to extract
  * @full: should the extraction only happen when the page is full.
  *
@@ -2377,12 +2657,12 @@ void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data)
  * to swap with a page in the ring buffer.
  *
  * for example:
- *      rpage = ring_buffer_alloc_page(buffer);
+ *      rpage = ring_buffer_alloc_read_page(buffer);
  *      if (!rpage)
  *              return error;
- *      ret = ring_buffer_read_page(buffer, &rpage, cpu, 0);
- *      if (ret)
- *              process_page(rpage);
+ *      ret = ring_buffer_read_page(buffer, &rpage, len, cpu, 0);
+ *      if (ret >= 0)
+ *              process_page(rpage, ret);
  *
  * When @full is set, the function will not return true unless
  * the writer is off the reader page.
@@ -2393,72 +2673,118 @@ void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data)
  *  responsible for that.
  *
  * Returns:
- *  1 if data has been transferred
- *  0 if no data has been transferred.
+ *  >=0 if data has been transferred, returns the offset of consumed data.
+ *  <0 if no data has been transferred.
  */
 int ring_buffer_read_page(struct ring_buffer *buffer,
-                            void **data_page, int cpu, int full)
+                          void **data_page, size_t len, int cpu, int full)
 {
         struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
         struct ring_buffer_event *event;
         struct buffer_data_page *bpage;
+        struct buffer_page *reader;
         unsigned long flags;
-        int ret = 0;
+        unsigned int commit;
+        unsigned int read;
+        u64 save_timestamp;
+        int ret = -1;
+
+        if (!cpumask_test_cpu(cpu, buffer->cpumask))
+                goto out;
+
+        /*
+         * If len is not big enough to hold the page header, then
+         * we can not copy anything.
+         */
+        if (len <= BUF_PAGE_HDR_SIZE)
+                goto out;
+
+        len -= BUF_PAGE_HDR_SIZE;
 
         if (!data_page)
-                return 0;
+                goto out;
 
         bpage = *data_page;
         if (!bpage)
-                return 0;
+                goto out;
 
         spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
 
-        /*
-         * rb_buffer_peek will get the next ring buffer if
-         * the current reader page is empty.
-         */
-        event = rb_buffer_peek(buffer, cpu, NULL);
-        if (!event)
-                goto out;
+        reader = rb_get_reader_page(cpu_buffer);
+        if (!reader)
+                goto out_unlock;
+
+        event = rb_reader_event(cpu_buffer);
+
+        read = reader->read;
+        commit = rb_page_commit(reader);
 
-        /* check for data */
-        if (!local_read(&cpu_buffer->reader_page->page->commit))
-                goto out;
         /*
-         * If the writer is already off of the read page, then simply
-         * switch the read page with the given page. Otherwise
-         * we need to copy the data from the reader to the writer.
+         * If this page has been partially read or
+         * if len is not big enough to read the rest of the page or
+         * a writer is still on the page, then
+         * we must copy the data from the page to the buffer.
+         * Otherwise, we can simply swap the page with the one passed in.
          */
-        if (cpu_buffer->reader_page == cpu_buffer->commit_page) {
-                unsigned int read = cpu_buffer->reader_page->read;
+        if (read || (len < (commit - read)) ||
+            cpu_buffer->reader_page == cpu_buffer->commit_page) {
+                struct buffer_data_page *rpage = cpu_buffer->reader_page->page;
+                unsigned int rpos = read;
+                unsigned int pos = 0;
+                unsigned int size;
 
                 if (full)
-                        goto out;
-                /* The writer is still on the reader page, we must copy */
-                bpage = cpu_buffer->reader_page->page;
-                memcpy(bpage->data,
-                       cpu_buffer->reader_page->page->data + read,
-                       local_read(&bpage->commit) - read);
+                        goto out_unlock;
+
+                if (len > (commit - read))
+                        len = (commit - read);
+
+                size = rb_event_length(event);
+
+                if (len < size)
+                        goto out_unlock;
 
-                /* consume what was read */
-                cpu_buffer->reader_page += read;
+                /* save the current timestamp, since the user will need it */
+                save_timestamp = cpu_buffer->read_stamp;
 
+                /* Need to copy one event at a time */
+                do {
+                        memcpy(bpage->data + pos, rpage->data + rpos, size);
+
+                        len -= size;
+
+                        rb_advance_reader(cpu_buffer);
+                        rpos = reader->read;
+                        pos += size;
+
+                        event = rb_reader_event(cpu_buffer);
+                        size = rb_event_length(event);
+                } while (len > size);
+
+                /* update bpage */
+                local_set(&bpage->commit, pos);
+                bpage->time_stamp = save_timestamp;
+
+                /* we copied everything to the beginning */
+                read = 0;
         } else {
                 /* swap the pages */
                 rb_init_page(bpage);
-                bpage = cpu_buffer->reader_page->page;
-                cpu_buffer->reader_page->page = *data_page;
-                cpu_buffer->reader_page->read = 0;
+                bpage = reader->page;
+                reader->page = *data_page;
+                local_set(&reader->write, 0);
+                reader->read = 0;
                 *data_page = bpage;
+
+                /* update the entry counter */
+                rb_remove_entries(cpu_buffer, bpage, read);
         }
-        ret = 1;
+        ret = read;
 
-        /* update the entry counter */
-        rb_remove_entries(cpu_buffer, bpage);
- out:
+ out_unlock:
         spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 
+ out:
         return ret;
 }
 
@@ -2466,7 +2792,7 @@ static ssize_t
 rb_simple_read(struct file *filp, char __user *ubuf,
                size_t cnt, loff_t *ppos)
 {
-        long *p = filp->private_data;
+        unsigned long *p = filp->private_data;
         char buf[64];
         int r;
 
@@ -2482,9 +2808,9 @@ static ssize_t
 rb_simple_write(struct file *filp, const char __user *ubuf,
                 size_t cnt, loff_t *ppos)
 {
-        long *p = filp->private_data;
+        unsigned long *p = filp->private_data;
         char buf[64];
-        long val;
+        unsigned long val;
         int ret;
 
         if (cnt >= sizeof(buf))
@@ -2509,7 +2835,7 @@ rb_simple_write(struct file *filp, const char __user *ubuf,
         return cnt;
 }
 
-static struct file_operations rb_simple_fops = {
+static const struct file_operations rb_simple_fops = {
         .open           = tracing_open_generic,
         .read           = rb_simple_read,
         .write          = rb_simple_write,
@@ -2532,3 +2858,42 @@ static __init int rb_init_debugfs(void)
 }
 
 fs_initcall(rb_init_debugfs);
+
+#ifdef CONFIG_HOTPLUG_CPU
+static int rb_cpu_notify(struct notifier_block *self,
+                         unsigned long action, void *hcpu)
+{
+        struct ring_buffer *buffer =
+                container_of(self, struct ring_buffer, cpu_notify);
+        long cpu = (long)hcpu;
+
+        switch (action) {
+        case CPU_UP_PREPARE:
+        case CPU_UP_PREPARE_FROZEN:
+                if (cpu_isset(cpu, *buffer->cpumask))
+                        return NOTIFY_OK;
+
+                buffer->buffers[cpu] =
+                        rb_allocate_cpu_buffer(buffer, cpu);
+                if (!buffer->buffers[cpu]) {
+                        WARN(1, "failed to allocate ring buffer on CPU %ld\n",
+                             cpu);
+                        return NOTIFY_OK;
+                }
+                smp_wmb();
+                cpu_set(cpu, *buffer->cpumask);
+                break;
+        case CPU_DOWN_PREPARE:
+        case CPU_DOWN_PREPARE_FROZEN:
+                /*
+                 * Do nothing.
+                 *  If we were to free the buffer, then the user would
+                 *  lose any trace that was in the buffer.
+                 */
+                break;
+        default:
+                break;
+        }
+        return NOTIFY_OK;
+}
+#endif
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 17bb88d86ac2..9d28476a9851 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -11,32 +11,34 @@
  *  Copyright (C) 2004-2006 Ingo Molnar
  *  Copyright (C) 2004 William Lee Irwin III
  */
+#include <linux/ring_buffer.h>
 #include <linux/utsrelease.h>
+#include <linux/stacktrace.h>
+#include <linux/writeback.h>
 #include <linux/kallsyms.h>
 #include <linux/seq_file.h>
 #include <linux/notifier.h>
+#include <linux/irqflags.h>
 #include <linux/debugfs.h>
 #include <linux/pagemap.h>
 #include <linux/hardirq.h>
 #include <linux/linkage.h>
 #include <linux/uaccess.h>
+#include <linux/kprobes.h>
 #include <linux/ftrace.h>
 #include <linux/module.h>
 #include <linux/percpu.h>
+#include <linux/splice.h>
 #include <linux/kdebug.h>
+#include <linux/string.h>
 #include <linux/ctype.h>
 #include <linux/init.h>
 #include <linux/poll.h>
 #include <linux/gfp.h>
 #include <linux/fs.h>
-#include <linux/kprobes.h>
-#include <linux/writeback.h>
-
-#include <linux/stacktrace.h>
-#include <linux/ring_buffer.h>
-#include <linux/irqflags.h>
 
 #include "trace.h"
+#include "trace_output.h"
 
 #define TRACE_BUFFER_FLAGS      (RB_FL_OVERWRITE)
 
@@ -44,14 +46,25 @@ unsigned long __read_mostly	tracing_max_latency;
 unsigned long __read_mostly     tracing_thresh;
 
 /*
+ * On boot up, the ring buffer is set to the minimum size, so that
+ * we do not waste memory on systems that are not using tracing.
+ */
+static int ring_buffer_expanded;
+
+/*
  * We need to change this state when a selftest is running.
  * A selftest will lurk into the ring-buffer to count the
  * entries inserted during the selftest although some concurrent
- * insertions into the ring-buffer such as ftrace_printk could occurred
+ * insertions into the ring-buffer such as trace_printk could occurred
  * at the same time, giving false positive or negative results.
  */
 static bool __read_mostly tracing_selftest_running;
 
+/*
+ * If a tracer is running, we do not want to run SELFTEST.
+ */
+static bool __read_mostly tracing_selftest_disabled;
+
 /* For tracers that don't implement custom flags */
 static struct tracer_opt dummy_tracer_opt[] = {
         { }
@@ -73,7 +86,7 @@ static int dummy_set_flag(u32 old_flags, u32 bit, int set)
  * of the tracer is successful. But that is the only place that sets
  * this back to zero.
  */
-int tracing_disabled = 1;
+static int tracing_disabled = 1;
 
 static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled);
 
@@ -91,6 +104,9 @@ static inline void ftrace_enable_cpu(void)
 
 static cpumask_var_t __read_mostly      tracing_buffer_mask;
 
+/* Define which cpu buffers are currently read in trace_pipe */
+static cpumask_var_t                    tracing_reader_cpumask;
+
 #define for_each_tracing_cpu(cpu)       \
         for_each_cpu(cpu, tracing_buffer_mask)
 
@@ -109,14 +125,21 @@ static cpumask_var_t __read_mostly	tracing_buffer_mask;
  */
 int ftrace_dump_on_oops;
 
-static int tracing_set_tracer(char *buf);
+static int tracing_set_tracer(const char *buf);
+
+#define BOOTUP_TRACER_SIZE              100
+static char bootup_tracer_buf[BOOTUP_TRACER_SIZE] __initdata;
+static char *default_bootup_tracer;
 
 static int __init set_ftrace(char *str)
 {
-        tracing_set_tracer(str);
+        strncpy(bootup_tracer_buf, str, BOOTUP_TRACER_SIZE);
+        default_bootup_tracer = bootup_tracer_buf;
+        /* We are using ftrace early, expand it */
+        ring_buffer_expanded = 1;
         return 1;
 }
-__setup("ftrace", set_ftrace);
+__setup("ftrace=", set_ftrace);
 
 static int __init set_ftrace_dump_on_oops(char *str)
 {
@@ -125,21 +148,13 @@ static int __init set_ftrace_dump_on_oops(char *str)
 }
 __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops);
 
-long
-ns2usecs(cycle_t nsec)
+unsigned long long ns2usecs(cycle_t nsec)
 {
         nsec += 500;
         do_div(nsec, 1000);
         return nsec;
 }
 
-cycle_t ftrace_now(int cpu)
-{
-        u64 ts = ring_buffer_time_stamp(cpu);
-        ring_buffer_normalize_time_stamp(cpu, &ts);
-        return ts;
-}
-
 /*
  * The global_trace is the descriptor that holds the tracing
  * buffers for the live tracing. For each CPU, it contains
@@ -156,6 +171,20 @@ static struct trace_array	global_trace;
 
 static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu);
 
+cycle_t ftrace_now(int cpu)
+{
+        u64 ts;
+
+        /* Early boot up does not have a buffer yet */
+        if (!global_trace.buffer)
+                return trace_clock_local();
+
+        ts = ring_buffer_time_stamp(global_trace.buffer, cpu);
+        ring_buffer_normalize_time_stamp(global_trace.buffer, cpu, &ts);
+
+        return ts;
+}
+
 /*
  * The max_tr is used to snapshot the global_trace when a maximum
  * latency is reached. Some tracers will use this to store a maximum
@@ -186,9 +215,6 @@ int tracing_is_enabled(void)
         return tracer_enabled;
 }
 
-/* function tracing enabled */
-int                             ftrace_function_enabled;
-
 /*
  * trace_buf_size is the size in bytes that is allocated
  * for a buffer. Note, the number of bytes is always rounded
@@ -229,7 +255,7 @@ static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
 
 /* trace_flags holds trace_options default values */
 unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
-        TRACE_ITER_ANNOTATE;
+        TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME;
 
 /**
  * trace_wake_up - wake up tasks waiting for trace input
@@ -280,13 +306,17 @@ static const char *trace_options[] = {
         "block",
         "stacktrace",
         "sched-tree",
-        "ftrace_printk",
+        "trace_printk",
         "ftrace_preempt",
         "branch",
         "annotate",
         "userstacktrace",
         "sym-userobj",
         "printk-msg-only",
+        "context-info",
+        "latency-format",
+        "global-clock",
+        "sleep-time",
         NULL
 };
 
@@ -326,146 +356,37 @@ __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
         data->rt_priority = tsk->rt_priority;
 
         /* record this tasks comm */
-        tracing_record_cmdline(current);
+        tracing_record_cmdline(tsk);
 }
 
-/**
- * trace_seq_printf - sequence printing of trace information
- * @s: trace sequence descriptor
- * @fmt: printf format string
- *
- * The tracer may use either sequence operations or its own
- * copy to user routines. To simplify formating of a trace
- * trace_seq_printf is used to store strings into a special
- * buffer (@s). Then the output may be either used by
- * the sequencer or pulled into another buffer.
- */
-int
-trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
+ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt)
 {
-        int len = (PAGE_SIZE - 1) - s->len;
-        va_list ap;
+        int len;
         int ret;
 
-        if (!len)
-                return 0;
-
-        va_start(ap, fmt);
-        ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
-        va_end(ap);
-
-        /* If we can't write it all, don't bother writing anything */
-        if (ret >= len)
-                return 0;
-
-        s->len += ret;
-
-        return len;
-}
-
-/**
- * trace_seq_puts - trace sequence printing of simple string
- * @s: trace sequence descriptor
- * @str: simple string to record
- *
- * The tracer may use either the sequence operations or its own
- * copy to user routines. This function records a simple string
- * into a special buffer (@s) for later retrieval by a sequencer
- * or other mechanism.
- */
-static int
-trace_seq_puts(struct trace_seq *s, const char *str)
-{
-        int len = strlen(str);
-
-        if (len > ((PAGE_SIZE - 1) - s->len))
-                return 0;
-
-        memcpy(s->buffer + s->len, str, len);
-        s->len += len;
-
-        return len;
-}
-
-static int
-trace_seq_putc(struct trace_seq *s, unsigned char c)
-{
-        if (s->len >= (PAGE_SIZE - 1))
-                return 0;
-
-        s->buffer[s->len++] = c;
-
-        return 1;
-}
-
-static int
-trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
-{
-        if (len > ((PAGE_SIZE - 1) - s->len))
+        if (!cnt)
                 return 0;
 
-        memcpy(s->buffer + s->len, mem, len);
-        s->len += len;
-
-        return len;
-}
-
-#define MAX_MEMHEX_BYTES        8
-#define HEX_CHARS               (MAX_MEMHEX_BYTES*2 + 1)
-
-static int
-trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
-{
-        unsigned char hex[HEX_CHARS];
-        unsigned char *data = mem;
-        int i, j;
-
-#ifdef __BIG_ENDIAN
-        for (i = 0, j = 0; i < len; i++) {
-#else
-        for (i = len-1, j = 0; i >= 0; i--) {
-#endif
-                hex[j++] = hex_asc_hi(data[i]);
-                hex[j++] = hex_asc_lo(data[i]);
-        }
-        hex[j++] = ' ';
-
-        return trace_seq_putmem(s, hex, j);
-}
-
-static int
-trace_seq_path(struct trace_seq *s, struct path *path)
-{
-        unsigned char *p;
+        if (s->len <= s->readpos)
+                return -EBUSY;
 
-        if (s->len >= (PAGE_SIZE - 1))
-                return 0;
-        p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
-        if (!IS_ERR(p)) {
-                p = mangle_path(s->buffer + s->len, p, "\n");
-                if (p) {
-                        s->len = p - s->buffer;
-                        return 1;
-                }
-        } else {
-                s->buffer[s->len++] = '?';
-                return 1;
-        }
+        len = s->len - s->readpos;
+        if (cnt > len)
+                cnt = len;
+        ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt);
+        if (ret == cnt)
+                return -EFAULT;
 
-        return 0;
-}
+        cnt -= ret;
 
-static void
-trace_seq_reset(struct trace_seq *s)
-{
-        s->len = 0;
-        s->readpos = 0;
+        s->readpos += cnt;
+        return cnt;
 }
 
-ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt)
+static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt)
 {
         int len;
-        int ret;
+        void *ret;
 
         if (s->len <= s->readpos)
                 return -EBUSY;
@@ -473,11 +394,11 @@ ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt)
         len = s->len - s->readpos;
         if (cnt > len)
                 cnt = len;
-        ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt);
-        if (ret)
+        ret = memcpy(buf, s->buffer + s->readpos, cnt);
+        if (!ret)
                 return -EFAULT;
 
-        s->readpos += len;
+        s->readpos += cnt;
         return cnt;
 }
 
@@ -489,7 +410,7 @@ trace_print_seq(struct seq_file *m, struct trace_seq *s)
         s->buffer[len] = 0;
         seq_puts(m, s->buffer);
 
-        trace_seq_reset(s);
+        trace_seq_init(s);
 }
 
 /**
@@ -543,7 +464,7 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
 
         ftrace_enable_cpu();
 
-        WARN_ON_ONCE(ret);
+        WARN_ON_ONCE(ret && ret != -EAGAIN);
 
         __update_max_tr(tr, tsk, cpu);
         __raw_spin_unlock(&ftrace_max_lock);
@@ -556,6 +477,8 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
  * Register a new plugin tracer.
  */
 int register_tracer(struct tracer *type)
+__releases(kernel_lock)
+__acquires(kernel_lock)
 {
         struct tracer *t;
         int len;
@@ -594,9 +517,12 @@ int register_tracer(struct tracer *type)
         else
                 if (!type->flags->opts)
                         type->flags->opts = dummy_tracer_opt;
+        if (!type->wait_pipe)
+                type->wait_pipe = default_wait_pipe;
+
 
 #ifdef CONFIG_FTRACE_STARTUP_TEST
-        if (type->selftest) {
+        if (type->selftest && !tracing_selftest_disabled) {
                 struct tracer *saved_tracer = current_trace;
                 struct trace_array *tr = &global_trace;
                 int i;
@@ -638,8 +564,26 @@ int register_tracer(struct tracer *type)
  out:
         tracing_selftest_running = false;
         mutex_unlock(&trace_types_lock);
-        lock_kernel();
 
+        if (ret || !default_bootup_tracer)
+                goto out_unlock;
+
+        if (strncmp(default_bootup_tracer, type->name, BOOTUP_TRACER_SIZE))
+                goto out_unlock;
+
+        printk(KERN_INFO "Starting tracer '%s'\n", type->name);
+        /* Do we want this tracer to start on bootup? */
+        tracing_set_tracer(type->name);
+        default_bootup_tracer = NULL;
+        /* disable other selftests, since this will break it. */
+        tracing_selftest_disabled = 1;
+#ifdef CONFIG_FTRACE_STARTUP_TEST
+        printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n",
+               type->name);
+#endif
+
+ out_unlock:
+        lock_kernel();
         return ret;
 }
 
@@ -658,6 +602,15 @@ void unregister_tracer(struct tracer *type)
 
  found:
         *t = (*t)->next;
+
+        if (type == current_trace && tracer_enabled) {
+                tracer_enabled = 0;
+                tracing_stop();
+                if (current_trace->stop)
+                        current_trace->stop(&global_trace);
+                current_trace = &nop_trace;
+        }
+
         if (strlen(type->name) != max_tracer_type_len)
                 goto out;
 
@@ -689,19 +642,20 @@ void tracing_reset_online_cpus(struct trace_array *tr)
 }
 
 #define SAVED_CMDLINES 128
+#define NO_CMDLINE_MAP UINT_MAX
 static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1];
 static unsigned map_cmdline_to_pid[SAVED_CMDLINES];
 static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN];
 static int cmdline_idx;
-static DEFINE_SPINLOCK(trace_cmdline_lock);
+static raw_spinlock_t trace_cmdline_lock = __RAW_SPIN_LOCK_UNLOCKED;
 
 /* temporary disable recording */
-atomic_t trace_record_cmdline_disabled __read_mostly;
+static atomic_t trace_record_cmdline_disabled __read_mostly;
 
 static void trace_init_cmdlines(void)
 {
-        memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline));
-        memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid));
+        memset(&map_pid_to_cmdline, NO_CMDLINE_MAP, sizeof(map_pid_to_cmdline));
+        memset(&map_cmdline_to_pid, NO_CMDLINE_MAP, sizeof(map_cmdline_to_pid));
         cmdline_idx = 0;
 }
 
@@ -738,13 +692,12 @@ void tracing_start(void)
                 return;
 
         spin_lock_irqsave(&tracing_start_lock, flags);
-        if (--trace_stop_count)
-                goto out;
-
-        if (trace_stop_count < 0) {
-                /* Someone screwed up their debugging */
-                WARN_ON_ONCE(1);
-                trace_stop_count = 0;
+        if (--trace_stop_count) {
+                if (trace_stop_count < 0) {
+                        /* Someone screwed up their debugging */
+                        WARN_ON_ONCE(1);
+                        trace_stop_count = 0;
+                }
                 goto out;
         }
 
@@ -794,8 +747,7 @@ void trace_stop_cmdline_recording(void);
 
 static void trace_save_cmdline(struct task_struct *tsk)
 {
-        unsigned map;
-        unsigned idx;
+        unsigned pid, idx;
 
         if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT))
                 return;
@@ -806,17 +758,24 @@ static void trace_save_cmdline(struct task_struct *tsk)
          * nor do we want to disable interrupts,
          * so if we miss here, then better luck next time.
          */
-        if (!spin_trylock(&trace_cmdline_lock))
+        if (!__raw_spin_trylock(&trace_cmdline_lock))
                 return;
 
         idx = map_pid_to_cmdline[tsk->pid];
-        if (idx >= SAVED_CMDLINES) {
+        if (idx == NO_CMDLINE_MAP) {
                 idx = (cmdline_idx + 1) % SAVED_CMDLINES;
 
-                map = map_cmdline_to_pid[idx];
-                if (map <= PID_MAX_DEFAULT)
-                        map_pid_to_cmdline[map] = (unsigned)-1;
+                /*
+                 * Check whether the cmdline buffer at idx has a pid
+                 * mapped. We are going to overwrite that entry so we
+                 * need to clear the map_pid_to_cmdline. Otherwise we
+                 * would read the new comm for the old pid.
+                 */
+                pid = map_cmdline_to_pid[idx];
+                if (pid != NO_CMDLINE_MAP)
+                        map_pid_to_cmdline[pid] = NO_CMDLINE_MAP;
 
+                map_cmdline_to_pid[idx] = tsk->pid;
                 map_pid_to_cmdline[tsk->pid] = idx;
 
                 cmdline_idx = idx;
@@ -824,33 +783,37 @@ static void trace_save_cmdline(struct task_struct *tsk)
 
         memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN);
 
-        spin_unlock(&trace_cmdline_lock);
+        __raw_spin_unlock(&trace_cmdline_lock);
 }
 
-char *trace_find_cmdline(int pid)
+void trace_find_cmdline(int pid, char comm[])
 {
-        char *cmdline = "<...>";
         unsigned map;
 
-        if (!pid)
-                return "<idle>";
+        if (!pid) {
+                strcpy(comm, "<idle>");
+                return;
+        }
 
-        if (pid > PID_MAX_DEFAULT)
-                goto out;
+        if (pid > PID_MAX_DEFAULT) {
+                strcpy(comm, "<...>");
+                return;
+        }
 
+        __raw_spin_lock(&trace_cmdline_lock);
         map = map_pid_to_cmdline[pid];
-        if (map >= SAVED_CMDLINES)
-                goto out;
-
-        cmdline = saved_cmdlines[map];
+        if (map != NO_CMDLINE_MAP)
+                strcpy(comm, saved_cmdlines[map]);
+        else
+                strcpy(comm, "<...>");
 
- out:
-        return cmdline;
+        __raw_spin_unlock(&trace_cmdline_lock);
 }
 
 void tracing_record_cmdline(struct task_struct *tsk)
 {
-        if (atomic_read(&trace_record_cmdline_disabled))
+        if (atomic_read(&trace_record_cmdline_disabled) || !tracer_enabled ||
+            !tracing_is_on())
                 return;
 
         trace_save_cmdline(tsk);
@@ -864,7 +827,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
 
         entry->preempt_count            = pc & 0xff;
         entry->pid                      = (tsk) ? tsk->pid : 0;
-        entry->tgid                     = (tsk) ? tsk->tgid : 0;
+        entry->tgid                     = (tsk) ? tsk->tgid : 0;
         entry->flags =
 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
                 (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
@@ -876,78 +839,132 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
                 (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0);
 }
 
+struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr,
+                                                    unsigned char type,
+                                                    unsigned long len,
+                                                    unsigned long flags, int pc)
+{
+        struct ring_buffer_event *event;
+
+        event = ring_buffer_lock_reserve(tr->buffer, len);
+        if (event != NULL) {
+                struct trace_entry *ent = ring_buffer_event_data(event);
+
+                tracing_generic_entry_update(ent, flags, pc);
+                ent->type = type;
+        }
+
+        return event;
+}
+static void ftrace_trace_stack(struct trace_array *tr,
+                               unsigned long flags, int skip, int pc);
+static void ftrace_trace_userstack(struct trace_array *tr,
+                                   unsigned long flags, int pc);
+
+static inline void __trace_buffer_unlock_commit(struct trace_array *tr,
+                                        struct ring_buffer_event *event,
+                                        unsigned long flags, int pc,
+                                        int wake)
+{
+        ring_buffer_unlock_commit(tr->buffer, event);
+
+        ftrace_trace_stack(tr, flags, 6, pc);
+        ftrace_trace_userstack(tr, flags, pc);
+
+        if (wake)
+                trace_wake_up();
+}
+
+void trace_buffer_unlock_commit(struct trace_array *tr,
+                                        struct ring_buffer_event *event,
+                                        unsigned long flags, int pc)
+{
+        __trace_buffer_unlock_commit(tr, event, flags, pc, 1);
+}
+
+struct ring_buffer_event *
+trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,
+                                  unsigned long flags, int pc)
+{
+        return trace_buffer_lock_reserve(&global_trace,
+                                         type, len, flags, pc);
+}
+
+void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
+                                        unsigned long flags, int pc)
+{
+        return __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 1);
+}
+
+void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,
+                                        unsigned long flags, int pc)
+{
+        return __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 0);
+}
+
 void
-trace_function(struct trace_array *tr, struct trace_array_cpu *data,
+trace_function(struct trace_array *tr,
                unsigned long ip, unsigned long parent_ip, unsigned long flags,
                int pc)
 {
         struct ring_buffer_event *event;
         struct ftrace_entry *entry;
-        unsigned long irq_flags;
 
         /* If we are reading the ring buffer, don't trace */
         if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
                 return;
 
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-                                         &irq_flags);
+        event = trace_buffer_lock_reserve(tr, TRACE_FN, sizeof(*entry),
+                                          flags, pc);
         if (!event)
                 return;
         entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, flags, pc);
-        entry->ent.type                 = TRACE_FN;
         entry->ip                       = ip;
         entry->parent_ip                = parent_ip;
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+        ring_buffer_unlock_commit(tr->buffer, event);
 }
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
-static void __trace_graph_entry(struct trace_array *tr,
-                                struct trace_array_cpu *data,
+static int __trace_graph_entry(struct trace_array *tr,
                                 struct ftrace_graph_ent *trace,
                                 unsigned long flags,
                                 int pc)
 {
         struct ring_buffer_event *event;
         struct ftrace_graph_ent_entry *entry;
-        unsigned long irq_flags;
 
         if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
-                return;
+                return 0;
 
-        event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry),
-                                         &irq_flags);
+        event = trace_buffer_lock_reserve(&global_trace, TRACE_GRAPH_ENT,
+                                          sizeof(*entry), flags, pc);
         if (!event)
-                return;
+                return 0;
         entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, flags, pc);
-        entry->ent.type                 = TRACE_GRAPH_ENT;
         entry->graph_ent                        = *trace;
-        ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags);
+        ring_buffer_unlock_commit(global_trace.buffer, event);
+
+        return 1;
 }
 
 static void __trace_graph_return(struct trace_array *tr,
-                                struct trace_array_cpu *data,
                                 struct ftrace_graph_ret *trace,
                                 unsigned long flags,
                                 int pc)
 {
         struct ring_buffer_event *event;
         struct ftrace_graph_ret_entry *entry;
-        unsigned long irq_flags;
 
         if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
                 return;
 
-        event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry),
-                                         &irq_flags);
+        event = trace_buffer_lock_reserve(&global_trace, TRACE_GRAPH_RET,
+                                          sizeof(*entry), flags, pc);
         if (!event)
                 return;
         entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, flags, pc);
-        entry->ent.type                 = TRACE_GRAPH_RET;
         entry->ret                              = *trace;
-        ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags);
+        ring_buffer_unlock_commit(global_trace.buffer, event);
 }
 #endif
 
@@ -957,31 +974,23 @@ ftrace(struct trace_array *tr, struct trace_array_cpu *data,
        int pc)
 {
         if (likely(!atomic_read(&data->disabled)))
-                trace_function(tr, data, ip, parent_ip, flags, pc);
+                trace_function(tr, ip, parent_ip, flags, pc);
 }
 
-static void ftrace_trace_stack(struct trace_array *tr,
-                               struct trace_array_cpu *data,
-                               unsigned long flags,
-                               int skip, int pc)
+static void __ftrace_trace_stack(struct trace_array *tr,
+                                 unsigned long flags,
+                                 int skip, int pc)
 {
 #ifdef CONFIG_STACKTRACE
         struct ring_buffer_event *event;
         struct stack_entry *entry;
         struct stack_trace trace;
-        unsigned long irq_flags;
 
-        if (!(trace_flags & TRACE_ITER_STACKTRACE))
-                return;
-
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-                                         &irq_flags);
+        event = trace_buffer_lock_reserve(tr, TRACE_STACK,
+                                          sizeof(*entry), flags, pc);
         if (!event)
                 return;
         entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, flags, pc);
-        entry->ent.type         = TRACE_STACK;
-
         memset(&entry->caller, 0, sizeof(entry->caller));
 
         trace.nr_entries        = 0;
@@ -990,38 +999,43 @@ static void ftrace_trace_stack(struct trace_array *tr,
         trace.entries           = entry->caller;
 
         save_stack_trace(&trace);
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+        ring_buffer_unlock_commit(tr->buffer, event);
 #endif
 }
 
+static void ftrace_trace_stack(struct trace_array *tr,
+                               unsigned long flags,
+                               int skip, int pc)
+{
+        if (!(trace_flags & TRACE_ITER_STACKTRACE))
+                return;
+
+        __ftrace_trace_stack(tr, flags, skip, pc);
+}
+
 void __trace_stack(struct trace_array *tr,
-                   struct trace_array_cpu *data,
                    unsigned long flags,
-                   int skip)
+                   int skip, int pc)
 {
-        ftrace_trace_stack(tr, data, flags, skip, preempt_count());
+        __ftrace_trace_stack(tr, flags, skip, pc);
 }
 
 static void ftrace_trace_userstack(struct trace_array *tr,
-                   struct trace_array_cpu *data,
-                   unsigned long flags, int pc)
+                                   unsigned long flags, int pc)
 {
 #ifdef CONFIG_STACKTRACE
         struct ring_buffer_event *event;
         struct userstack_entry *entry;
         struct stack_trace trace;
-        unsigned long irq_flags;
 
         if (!(trace_flags & TRACE_ITER_USERSTACKTRACE))
                 return;
 
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-                                         &irq_flags);
+        event = trace_buffer_lock_reserve(tr, TRACE_USER_STACK,
+                                          sizeof(*entry), flags, pc);
         if (!event)
                 return;
         entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, flags, pc);
-        entry->ent.type         = TRACE_USER_STACK;
 
         memset(&entry->caller, 0, sizeof(entry->caller));
 
@@ -1031,70 +1045,58 @@ static void ftrace_trace_userstack(struct trace_array *tr,
         trace.entries           = entry->caller;
 
         save_stack_trace_user(&trace);
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+        ring_buffer_unlock_commit(tr->buffer, event);
 #endif
 }
 
-void __trace_userstack(struct trace_array *tr,
-                   struct trace_array_cpu *data,
-                   unsigned long flags)
+#ifdef UNUSED
+static void __trace_userstack(struct trace_array *tr, unsigned long flags)
 {
-        ftrace_trace_userstack(tr, data, flags, preempt_count());
+        ftrace_trace_userstack(tr, flags, preempt_count());
 }
+#endif /* UNUSED */
 
 static void
-ftrace_trace_special(void *__tr, void *__data,
+ftrace_trace_special(void *__tr,
                      unsigned long arg1, unsigned long arg2, unsigned long arg3,
                      int pc)
 {
         struct ring_buffer_event *event;
-        struct trace_array_cpu *data = __data;
         struct trace_array *tr = __tr;
         struct special_entry *entry;
-        unsigned long irq_flags;
 
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-                                         &irq_flags);
+        event = trace_buffer_lock_reserve(tr, TRACE_SPECIAL,
+                                          sizeof(*entry), 0, pc);
         if (!event)
                 return;
         entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, 0, pc);
-        entry->ent.type                 = TRACE_SPECIAL;
         entry->arg1                     = arg1;
         entry->arg2                     = arg2;
         entry->arg3                     = arg3;
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
-        ftrace_trace_stack(tr, data, irq_flags, 4, pc);
-        ftrace_trace_userstack(tr, data, irq_flags, pc);
-
-        trace_wake_up();
+        trace_buffer_unlock_commit(tr, event, 0, pc);
 }
 
 void
 __trace_special(void *__tr, void *__data,
                 unsigned long arg1, unsigned long arg2, unsigned long arg3)
 {
-        ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count());
+        ftrace_trace_special(__tr, arg1, arg2, arg3, preempt_count());
 }
 
 void
 tracing_sched_switch_trace(struct trace_array *tr,
-                           struct trace_array_cpu *data,
                            struct task_struct *prev,
                            struct task_struct *next,
                            unsigned long flags, int pc)
 {
         struct ring_buffer_event *event;
         struct ctx_switch_entry *entry;
-        unsigned long irq_flags;
 
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-                                           &irq_flags);
+        event = trace_buffer_lock_reserve(tr, TRACE_CTX,
+                                          sizeof(*entry), flags, pc);
         if (!event)
                 return;
         entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, flags, pc);
-        entry->ent.type                 = TRACE_CTX;
         entry->prev_pid                 = prev->pid;
         entry->prev_prio                = prev->prio;
         entry->prev_state               = prev->state;
@@ -1102,29 +1104,23 @@ tracing_sched_switch_trace(struct trace_array *tr,
         entry->next_prio                = next->prio;
         entry->next_state               = next->state;
         entry->next_cpu = task_cpu(next);
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
-        ftrace_trace_stack(tr, data, flags, 5, pc);
-        ftrace_trace_userstack(tr, data, flags, pc);
+        trace_buffer_unlock_commit(tr, event, flags, pc);
 }
 
 void
 tracing_sched_wakeup_trace(struct trace_array *tr,
-                           struct trace_array_cpu *data,
                            struct task_struct *wakee,
                            struct task_struct *curr,
                            unsigned long flags, int pc)
 {
         struct ring_buffer_event *event;
         struct ctx_switch_entry *entry;
-        unsigned long irq_flags;
 
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-                                           &irq_flags);
+        event = trace_buffer_lock_reserve(tr, TRACE_WAKE,
+                                          sizeof(*entry), flags, pc);
         if (!event)
                 return;
         entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, flags, pc);
-        entry->ent.type                 = TRACE_WAKE;
         entry->prev_pid                 = curr->pid;
         entry->prev_prio                = curr->prio;
         entry->prev_state               = curr->state;
@@ -1132,11 +1128,10 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
         entry->next_prio                = wakee->prio;
         entry->next_state               = wakee->state;
         entry->next_cpu                 = task_cpu(wakee);
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
-        ftrace_trace_stack(tr, data, flags, 6, pc);
-        ftrace_trace_userstack(tr, data, flags, pc);
 
-        trace_wake_up();
+        ring_buffer_unlock_commit(tr->buffer, event);
+        ftrace_trace_stack(tr, flags, 6, pc);
+        ftrace_trace_userstack(tr, flags, pc);
 }
 
 void
@@ -1157,66 +1152,7 @@ ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
         data = tr->data[cpu];
 
         if (likely(atomic_inc_return(&data->disabled) == 1))
-                ftrace_trace_special(tr, data, arg1, arg2, arg3, pc);
-
-        atomic_dec(&data->disabled);
-        local_irq_restore(flags);
-}
-
-#ifdef CONFIG_FUNCTION_TRACER
-static void
-function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
-{
-        struct trace_array *tr = &global_trace;
-        struct trace_array_cpu *data;
-        unsigned long flags;
-        long disabled;
-        int cpu, resched;
-        int pc;
-
-        if (unlikely(!ftrace_function_enabled))
-                return;
-
-        pc = preempt_count();
-        resched = ftrace_preempt_disable();
-        local_save_flags(flags);
-        cpu = raw_smp_processor_id();
-        data = tr->data[cpu];
-        disabled = atomic_inc_return(&data->disabled);
-
-        if (likely(disabled == 1))
-                trace_function(tr, data, ip, parent_ip, flags, pc);
-
-        atomic_dec(&data->disabled);
-        ftrace_preempt_enable(resched);
-}
-
-static void
-function_trace_call(unsigned long ip, unsigned long parent_ip)
-{
-        struct trace_array *tr = &global_trace;
-        struct trace_array_cpu *data;
-        unsigned long flags;
-        long disabled;
-        int cpu;
-        int pc;
-
-        if (unlikely(!ftrace_function_enabled))
-                return;
-
-        /*
-         * Need to use raw, since this must be called before the
-         * recursive protection is performed.
-         */
-        local_irq_save(flags);
-        cpu = raw_smp_processor_id();
-        data = tr->data[cpu];
-        disabled = atomic_inc_return(&data->disabled);
-
-        if (likely(disabled == 1)) {
-                pc = preempt_count();
-                trace_function(tr, data, ip, parent_ip, flags, pc);
-        }
+                ftrace_trace_special(tr, arg1, arg2, arg3, pc);
 
         atomic_dec(&data->disabled);
         local_irq_restore(flags);
@@ -1229,6 +1165,7 @@ int trace_graph_entry(struct ftrace_graph_ent *trace)
         struct trace_array_cpu *data;
         unsigned long flags;
         long disabled;
+        int ret;
         int cpu;
         int pc;
 
@@ -1244,15 +1181,18 @@ int trace_graph_entry(struct ftrace_graph_ent *trace)
         disabled = atomic_inc_return(&data->disabled);
         if (likely(disabled == 1)) {
                 pc = preempt_count();
-                __trace_graph_entry(tr, data, trace, flags, pc);
+                ret = __trace_graph_entry(tr, trace, flags, pc);
+        } else {
+                ret = 0;
         }
         /* Only do the atomic if it is not already set */
         if (!test_tsk_trace_graph(current))
                 set_tsk_trace_graph(current);
+
         atomic_dec(&data->disabled);
         local_irq_restore(flags);
 
-        return 1;
+        return ret;
 }
 
 void trace_graph_return(struct ftrace_graph_ret *trace)
@@ -1270,7 +1210,7 @@ void trace_graph_return(struct ftrace_graph_ret *trace)
         disabled = atomic_inc_return(&data->disabled);
         if (likely(disabled == 1)) {
                 pc = preempt_count();
-                __trace_graph_return(tr, data, trace, flags, pc);
+                __trace_graph_return(tr, trace, flags, pc);
         }
         if (!trace->depth)
                 clear_tsk_trace_graph(current);
@@ -1279,30 +1219,122 @@ void trace_graph_return(struct ftrace_graph_ret *trace)
 }
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 
-static struct ftrace_ops trace_ops __read_mostly =
-{
-        .func = function_trace_call,
-};
 
-void tracing_start_function_trace(void)
+/**
+ * trace_vbprintk - write binary msg to tracing buffer
+ *
+ */
+int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
 {
-        ftrace_function_enabled = 0;
+        static raw_spinlock_t trace_buf_lock =
+                (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
+        static u32 trace_buf[TRACE_BUF_SIZE];
 
-        if (trace_flags & TRACE_ITER_PREEMPTONLY)
-                trace_ops.func = function_trace_call_preempt_only;
-        else
-                trace_ops.func = function_trace_call;
+        struct ring_buffer_event *event;
+        struct trace_array *tr = &global_trace;
+        struct trace_array_cpu *data;
+        struct bprint_entry *entry;
+        unsigned long flags;
+        int resched;
+        int cpu, len = 0, size, pc;
+
+        if (unlikely(tracing_selftest_running || tracing_disabled))
+                return 0;
+
+        /* Don't pollute graph traces with trace_vprintk internals */
+        pause_graph_tracing();
+
+        pc = preempt_count();
+        resched = ftrace_preempt_disable();
+        cpu = raw_smp_processor_id();
+        data = tr->data[cpu];
+
+        if (unlikely(atomic_read(&data->disabled)))
+                goto out;
+
+        /* Lockdep uses trace_printk for lock tracing */
+        local_irq_save(flags);
+        __raw_spin_lock(&trace_buf_lock);
+        len = vbin_printf(trace_buf, TRACE_BUF_SIZE, fmt, args);
+
+        if (len > TRACE_BUF_SIZE || len < 0)
+                goto out_unlock;
+
+        size = sizeof(*entry) + sizeof(u32) * len;
+        event = trace_buffer_lock_reserve(tr, TRACE_BPRINT, size, flags, pc);
+        if (!event)
+                goto out_unlock;
+        entry = ring_buffer_event_data(event);
+        entry->ip                       = ip;
+        entry->fmt                      = fmt;
+
+        memcpy(entry->buf, trace_buf, sizeof(u32) * len);
+        ring_buffer_unlock_commit(tr->buffer, event);
+
+out_unlock:
+        __raw_spin_unlock(&trace_buf_lock);
+        local_irq_restore(flags);
+
+out:
+        ftrace_preempt_enable(resched);
+        unpause_graph_tracing();
 
-        register_ftrace_function(&trace_ops);
-        ftrace_function_enabled = 1;
+        return len;
 }
+EXPORT_SYMBOL_GPL(trace_vbprintk);
 
-void tracing_stop_function_trace(void)
+int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
 {
-        ftrace_function_enabled = 0;
-        unregister_ftrace_function(&trace_ops);
+        static raw_spinlock_t trace_buf_lock = __RAW_SPIN_LOCK_UNLOCKED;
+        static char trace_buf[TRACE_BUF_SIZE];
+
+        struct ring_buffer_event *event;
+        struct trace_array *tr = &global_trace;
+        struct trace_array_cpu *data;
+        int cpu, len = 0, size, pc;
+        struct print_entry *entry;
+        unsigned long irq_flags;
+
+        if (tracing_disabled || tracing_selftest_running)
+                return 0;
+
+        pc = preempt_count();
+        preempt_disable_notrace();
+        cpu = raw_smp_processor_id();
+        data = tr->data[cpu];
+
+        if (unlikely(atomic_read(&data->disabled)))
+                goto out;
+
+        pause_graph_tracing();
+        raw_local_irq_save(irq_flags);
+        __raw_spin_lock(&trace_buf_lock);
+        len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
+
+        len = min(len, TRACE_BUF_SIZE-1);
+        trace_buf[len] = 0;
+
+        size = sizeof(*entry) + len + 1;
+        event = trace_buffer_lock_reserve(tr, TRACE_PRINT, size, irq_flags, pc);
+        if (!event)
+                goto out_unlock;
+        entry = ring_buffer_event_data(event);
+        entry->ip                       = ip;
+
+        memcpy(&entry->buf, trace_buf, len);
+        entry->buf[len] = 0;
+        ring_buffer_unlock_commit(tr->buffer, event);
+
+ out_unlock:
+        __raw_spin_unlock(&trace_buf_lock);
+        raw_local_irq_restore(irq_flags);
+        unpause_graph_tracing();
+ out:
+        preempt_enable_notrace();
+
+        return len;
 }
-#endif
+EXPORT_SYMBOL_GPL(trace_vprintk);
 
 enum trace_file_type {
         TRACE_FILE_LAT_FMT      = 1,
@@ -1345,10 +1377,25 @@ __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts)
 {
         struct ring_buffer *buffer = iter->tr->buffer;
         struct trace_entry *ent, *next = NULL;
+        int cpu_file = iter->cpu_file;
         u64 next_ts = 0, ts;
         int next_cpu = -1;
         int cpu;
 
+        /*
+         * If we are in a per_cpu trace file, don't bother by iterating over
+         * all cpu and peek directly.
+         */
+        if (cpu_file > TRACE_PIPE_ALL_CPU) {
+                if (ring_buffer_empty_cpu(buffer, cpu_file))
+                        return NULL;
+                ent = peek_next_entry(iter, cpu_file, ent_ts);
+                if (ent_cpu)
+                        *ent_cpu = cpu_file;
+
+                return ent;
+        }
+
         for_each_tracing_cpu(cpu) {
 
                 if (ring_buffer_empty_cpu(buffer, cpu))
@@ -1376,8 +1423,8 @@ __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts)
 }
 
 /* Find the next real entry, without updating the iterator itself */
-static struct trace_entry *
-find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts)
+struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
+                                          int *ent_cpu, u64 *ent_ts)
 {
         return __find_next_entry(iter, ent_cpu, ent_ts);
 }
@@ -1426,19 +1473,32 @@ static void *s_next(struct seq_file *m, void *v, loff_t *pos)
         return ent;
 }
 
+/*
+ * No necessary locking here. The worst thing which can
+ * happen is loosing events consumed at the same time
+ * by a trace_pipe reader.
+ * Other than that, we don't risk to crash the ring buffer
+ * because it serializes the readers.
+ *
+ * The current tracer is copied to avoid a global locking
+ * all around.
+ */
 static void *s_start(struct seq_file *m, loff_t *pos)
 {
         struct trace_iterator *iter = m->private;
+        static struct tracer *old_tracer;
+        int cpu_file = iter->cpu_file;
         void *p = NULL;
         loff_t l = 0;
         int cpu;
 
+        /* copy the tracer to avoid using a global lock all around */
         mutex_lock(&trace_types_lock);
-
-        if (!current_trace || current_trace != iter->trace) {
-                mutex_unlock(&trace_types_lock);
-                return NULL;
+        if (unlikely(old_tracer != current_trace && current_trace)) {
+                old_tracer = current_trace;
+                *iter->trace = *current_trace;
         }
+        mutex_unlock(&trace_types_lock);
 
         atomic_inc(&trace_record_cmdline_disabled);
 
@@ -1449,9 +1509,12 @@ static void *s_start(struct seq_file *m, loff_t *pos)
 
                 ftrace_disable_cpu();
 
-                for_each_tracing_cpu(cpu) {
-                        ring_buffer_iter_reset(iter->buffer_iter[cpu]);
-                }
+                if (cpu_file == TRACE_PIPE_ALL_CPU) {
+                        for_each_tracing_cpu(cpu)
+                                ring_buffer_iter_reset(iter->buffer_iter[cpu]);
+                } else
+                        ring_buffer_iter_reset(iter->buffer_iter[cpu_file]);
+
 
                 ftrace_enable_cpu();
 
@@ -1469,155 +1532,6 @@ static void *s_start(struct seq_file *m, loff_t *pos)
 static void s_stop(struct seq_file *m, void *p)
 {
         atomic_dec(&trace_record_cmdline_disabled);
-        mutex_unlock(&trace_types_lock);
-}
-
-#ifdef CONFIG_KRETPROBES
-static inline const char *kretprobed(const char *name)
-{
-        static const char tramp_name[] = "kretprobe_trampoline";
-        int size = sizeof(tramp_name);
-
-        if (strncmp(tramp_name, name, size) == 0)
-                return "[unknown/kretprobe'd]";
-        return name;
-}
-#else
-static inline const char *kretprobed(const char *name)
-{
-        return name;
-}
-#endif /* CONFIG_KRETPROBES */
-
-static int
-seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
-{
-#ifdef CONFIG_KALLSYMS
-        char str[KSYM_SYMBOL_LEN];
-        const char *name;
-
-        kallsyms_lookup(address, NULL, NULL, NULL, str);
-
-        name = kretprobed(str);
-
-        return trace_seq_printf(s, fmt, name);
-#endif
-        return 1;
-}
-
-static int
-seq_print_sym_offset(struct trace_seq *s, const char *fmt,
-                     unsigned long address)
-{
-#ifdef CONFIG_KALLSYMS
-        char str[KSYM_SYMBOL_LEN];
-        const char *name;
-
-        sprint_symbol(str, address);
-        name = kretprobed(str);
-
-        return trace_seq_printf(s, fmt, name);
-#endif
-        return 1;
-}
-
-#ifndef CONFIG_64BIT
-# define IP_FMT "%08lx"
-#else
-# define IP_FMT "%016lx"
-#endif
-
-int
-seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
-{
-        int ret;
-
-        if (!ip)
-                return trace_seq_printf(s, "0");
-
-        if (sym_flags & TRACE_ITER_SYM_OFFSET)
-                ret = seq_print_sym_offset(s, "%s", ip);
-        else
-                ret = seq_print_sym_short(s, "%s", ip);
-
-        if (!ret)
-                return 0;
-
-        if (sym_flags & TRACE_ITER_SYM_ADDR)
-                ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
-        return ret;
-}
-
-static inline int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
-                                    unsigned long ip, unsigned long sym_flags)
-{
-        struct file *file = NULL;
-        unsigned long vmstart = 0;
-        int ret = 1;
-
-        if (mm) {
-                const struct vm_area_struct *vma;
-
-                down_read(&mm->mmap_sem);
-                vma = find_vma(mm, ip);
-                if (vma) {
-                        file = vma->vm_file;
-                        vmstart = vma->vm_start;
-                }
-                if (file) {
-                        ret = trace_seq_path(s, &file->f_path);
-                        if (ret)
-                                ret = trace_seq_printf(s, "[+0x%lx]", ip - vmstart);
-                }
-                up_read(&mm->mmap_sem);
-        }
-        if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
-                ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
-        return ret;
-}
-
-static int
-seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
-                      unsigned long sym_flags)
-{
-        struct mm_struct *mm = NULL;
-        int ret = 1;
-        unsigned int i;
-
-        if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
-                struct task_struct *task;
-                /*
-                 * we do the lookup on the thread group leader,
-                 * since individual threads might have already quit!
-                 */
-                rcu_read_lock();
-                task = find_task_by_vpid(entry->ent.tgid);
-                if (task)
-                        mm = get_task_mm(task);
-                rcu_read_unlock();
-        }
-
-        for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
-                unsigned long ip = entry->caller[i];
-
-                if (ip == ULONG_MAX || !ret)
-                        break;
-                if (i && ret)
-                        ret = trace_seq_puts(s, " <- ");
-                if (!ip) {
-                        if (ret)
-                                ret = trace_seq_puts(s, "??");
-                        continue;
-                }
-                if (!ret)
-                        break;
-                if (ret)
-                        ret = seq_print_user_ip(s, mm, ip, sym_flags);
-        }
-
-        if (mm)
-                mmput(mm);
-        return ret;
 }
 
 static void print_lat_help_header(struct seq_file *m)
@@ -1658,11 +1572,11 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
         total = entries +
                 ring_buffer_overruns(iter->tr->buffer);
 
-        seq_printf(m, "%s latency trace v1.1.5 on %s\n",
+        seq_printf(m, "# %s latency trace v1.1.5 on %s\n",
                    name, UTS_RELEASE);
-        seq_puts(m, "-----------------------------------"
+        seq_puts(m, "# -----------------------------------"
                  "---------------------------------\n");
-        seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |"
+        seq_printf(m, "# latency: %lu us, #%lu/%lu, CPU#%d |"
                    " (M:%s VP:%d, KP:%d, SP:%d HP:%d",
                    nsecs_to_usecs(data->saved_latency),
                    entries,
@@ -1684,121 +1598,24 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
 #else
         seq_puts(m, ")\n");
 #endif
-        seq_puts(m, "    -----------------\n");
-        seq_printf(m, "    | task: %.16s-%d "
+        seq_puts(m, "#    -----------------\n");
+        seq_printf(m, "#    | task: %.16s-%d "
                    "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n",
                    data->comm, data->pid, data->uid, data->nice,
                    data->policy, data->rt_priority);
-        seq_puts(m, "    -----------------\n");
+        seq_puts(m, "#    -----------------\n");
 
         if (data->critical_start) {
-                seq_puts(m, " => started at: ");
+                seq_puts(m, "#  => started at: ");
                 seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags);
                 trace_print_seq(m, &iter->seq);
-                seq_puts(m, "\n => ended at:   ");
+                seq_puts(m, "\n#  => ended at:   ");
                 seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags);
                 trace_print_seq(m, &iter->seq);
-                seq_puts(m, "\n");
-        }
-
-        seq_puts(m, "\n");
-}
-
-static void
-lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
-{
-        int hardirq, softirq;
-        char *comm;
-
-        comm = trace_find_cmdline(entry->pid);
-
-        trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid);
-        trace_seq_printf(s, "%3d", cpu);
-        trace_seq_printf(s, "%c%c",
-                        (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
-                         (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.',
-                        ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.'));
-
-        hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
-        softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
-        if (hardirq && softirq) {
-                trace_seq_putc(s, 'H');
-        } else {
-                if (hardirq) {
-                        trace_seq_putc(s, 'h');
-                } else {
-                        if (softirq)
-                                trace_seq_putc(s, 's');
-                        else
-                                trace_seq_putc(s, '.');
-                }
-        }
-
-        if (entry->preempt_count)
-                trace_seq_printf(s, "%x", entry->preempt_count);
-        else
-                trace_seq_puts(s, ".");
-}
-
-unsigned long preempt_mark_thresh = 100;
-
-static void
-lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
-                    unsigned long rel_usecs)
-{
-        trace_seq_printf(s, " %4lldus", abs_usecs);
-        if (rel_usecs > preempt_mark_thresh)
-                trace_seq_puts(s, "!: ");
-        else if (rel_usecs > 1)
-                trace_seq_puts(s, "+: ");
-        else
-                trace_seq_puts(s, " : ");
-}
-
-static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
-
-static int task_state_char(unsigned long state)
-{
-        int bit = state ? __ffs(state) + 1 : 0;
-
-        return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
-}
-
-/*
- * The message is supposed to contain an ending newline.
- * If the printing stops prematurely, try to add a newline of our own.
- */
-void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter)
-{
-        struct trace_entry *ent;
-        struct trace_field_cont *cont;
-        bool ok = true;
-
-        ent = peek_next_entry(iter, iter->cpu, NULL);
-        if (!ent || ent->type != TRACE_CONT) {
-                trace_seq_putc(s, '\n');
-                return;
+                seq_puts(m, "#\n");
         }
 
-        do {
-                cont = (struct trace_field_cont *)ent;
-                if (ok)
-                        ok = (trace_seq_printf(s, "%s", cont->buf) > 0);
-
-                ftrace_disable_cpu();
-
-                if (iter->buffer_iter[iter->cpu])
-                        ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
-                else
-                        ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL);
-
-                ftrace_enable_cpu();
-
-                ent = peek_next_entry(iter, iter->cpu, NULL);
-        } while (ent && ent->type == TRACE_CONT);
-
-        if (!ok)
-                trace_seq_putc(s, '\n');
+        seq_puts(m, "#\n");
 }
 
 static void test_cpu_buff_start(struct trace_iterator *iter)
@@ -1815,141 +1632,11 @@ static void test_cpu_buff_start(struct trace_iterator *iter)
                 return;
 
         cpumask_set_cpu(iter->cpu, iter->started);
-        trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu);
-}
-
-static enum print_line_t
-print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
-{
-        struct trace_seq *s = &iter->seq;
-        unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
-        struct trace_entry *next_entry;
-        unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
-        struct trace_entry *entry = iter->ent;
-        unsigned long abs_usecs;
-        unsigned long rel_usecs;
-        u64 next_ts;
-        char *comm;
-        int S, T;
-        int i;
-
-        if (entry->type == TRACE_CONT)
-                return TRACE_TYPE_HANDLED;
-
-        test_cpu_buff_start(iter);
-
-        next_entry = find_next_entry(iter, NULL, &next_ts);
-        if (!next_entry)
-                next_ts = iter->ts;
-        rel_usecs = ns2usecs(next_ts - iter->ts);
-        abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
-
-        if (verbose) {
-                comm = trace_find_cmdline(entry->pid);
-                trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]"
-                                 " %ld.%03ldms (+%ld.%03ldms): ",
-                                 comm,
-                                 entry->pid, cpu, entry->flags,
-                                 entry->preempt_count, trace_idx,
-                                 ns2usecs(iter->ts),
-                                 abs_usecs/1000,
-                                 abs_usecs % 1000, rel_usecs/1000,
-                                 rel_usecs % 1000);
-        } else {
-                lat_print_generic(s, entry, cpu);
-                lat_print_timestamp(s, abs_usecs, rel_usecs);
-        }
-        switch (entry->type) {
-        case TRACE_FN: {
-                struct ftrace_entry *field;
-
-                trace_assign_type(field, entry);
-
-                seq_print_ip_sym(s, field->ip, sym_flags);
-                trace_seq_puts(s, " (");
-                seq_print_ip_sym(s, field->parent_ip, sym_flags);
-                trace_seq_puts(s, ")\n");
-                break;
-        }
-        case TRACE_CTX:
-        case TRACE_WAKE: {
-                struct ctx_switch_entry *field;
-
-                trace_assign_type(field, entry);
-
-                T = task_state_char(field->next_state);
-                S = task_state_char(field->prev_state);
-                comm = trace_find_cmdline(field->next_pid);
-                trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
-                                 field->prev_pid,
-                                 field->prev_prio,
-                                 S, entry->type == TRACE_CTX ? "==>" : "  +",
-                                 field->next_cpu,
-                                 field->next_pid,
-                                 field->next_prio,
-                                 T, comm);
-                break;
-        }
-        case TRACE_SPECIAL: {
-                struct special_entry *field;
-
-                trace_assign_type(field, entry);
-
-                trace_seq_printf(s, "# %ld %ld %ld\n",
-                                 field->arg1,
-                                 field->arg2,
-                                 field->arg3);
-                break;
-        }
-        case TRACE_STACK: {
-                struct stack_entry *field;
-
-                trace_assign_type(field, entry);
-
-                for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
-                        if (i)
-                                trace_seq_puts(s, " <= ");
-                        seq_print_ip_sym(s, field->caller[i], sym_flags);
-                }
-                trace_seq_puts(s, "\n");
-                break;
-        }
-        case TRACE_PRINT: {
-                struct print_entry *field;
 
-                trace_assign_type(field, entry);
-
-                seq_print_ip_sym(s, field->ip, sym_flags);
-                trace_seq_printf(s, ": %s", field->buf);
-                if (entry->flags & TRACE_FLAG_CONT)
-                        trace_seq_print_cont(s, iter);
-                break;
-        }
-        case TRACE_BRANCH: {
-                struct trace_branch *field;
-
-                trace_assign_type(field, entry);
-
-                trace_seq_printf(s, "[%s] %s:%s:%d\n",
-                                 field->correct ? "  ok  " : " MISS ",
-                                 field->func,
-                                 field->file,
-                                 field->line);
-                break;
-        }
-        case TRACE_USER_STACK: {
-                struct userstack_entry *field;
-
-                trace_assign_type(field, entry);
-
-                seq_print_userip_objs(field, s, sym_flags);
-                trace_seq_putc(s, '\n');
-                break;
-        }
-        default:
-                trace_seq_printf(s, "Unknown type %d\n", entry->type);
-        }
-        return TRACE_TYPE_HANDLED;
+        /* Don't print started cpu buffer for the first entry of the trace */
+        if (iter->idx > 1)
+                trace_seq_printf(s, "##### CPU %u buffer started ####\n",
+                                iter->cpu);
 }
 
 static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
@@ -1957,333 +1644,84 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
         struct trace_seq *s = &iter->seq;
         unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
         struct trace_entry *entry;
-        unsigned long usec_rem;
-        unsigned long long t;
-        unsigned long secs;
-        char *comm;
-        int ret;
-        int S, T;
-        int i;
+        struct trace_event *event;
 
         entry = iter->ent;
 
-        if (entry->type == TRACE_CONT)
-                return TRACE_TYPE_HANDLED;
-
         test_cpu_buff_start(iter);
 
-        comm = trace_find_cmdline(iter->ent->pid);
-
-        t = ns2usecs(iter->ts);
-        usec_rem = do_div(t, 1000000ULL);
-        secs = (unsigned long)t;
-
-        ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-        ret = trace_seq_printf(s, "[%03d] ", iter->cpu);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-        ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        switch (entry->type) {
-        case TRACE_FN: {
-                struct ftrace_entry *field;
-
-                trace_assign_type(field, entry);
-
-                ret = seq_print_ip_sym(s, field->ip, sym_flags);
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-                if ((sym_flags & TRACE_ITER_PRINT_PARENT) &&
-                                                field->parent_ip) {
-                        ret = trace_seq_printf(s, " <-");
-                        if (!ret)
-                                return TRACE_TYPE_PARTIAL_LINE;
-                        ret = seq_print_ip_sym(s,
-                                               field->parent_ip,
-                                               sym_flags);
-                        if (!ret)
-                                return TRACE_TYPE_PARTIAL_LINE;
-                }
-                ret = trace_seq_printf(s, "\n");
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-                break;
-        }
-        case TRACE_CTX:
-        case TRACE_WAKE: {
-                struct ctx_switch_entry *field;
-
-                trace_assign_type(field, entry);
-
-                T = task_state_char(field->next_state);
-                S = task_state_char(field->prev_state);
-                ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n",
-                                       field->prev_pid,
-                                       field->prev_prio,
-                                       S,
-                                       entry->type == TRACE_CTX ? "==>" : "  +",
-                                       field->next_cpu,
-                                       field->next_pid,
-                                       field->next_prio,
-                                       T);
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-                break;
-        }
-        case TRACE_SPECIAL: {
-                struct special_entry *field;
-
-                trace_assign_type(field, entry);
+        event = ftrace_find_event(entry->type);
 
-                ret = trace_seq_printf(s, "# %ld %ld %ld\n",
-                                 field->arg1,
-                                 field->arg2,
-                                 field->arg3);
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-                break;
-        }
-        case TRACE_STACK: {
-                struct stack_entry *field;
-
-                trace_assign_type(field, entry);
-
-                for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
-                        if (i) {
-                                ret = trace_seq_puts(s, " <= ");
-                                if (!ret)
-                                        return TRACE_TYPE_PARTIAL_LINE;
-                        }
-                        ret = seq_print_ip_sym(s, field->caller[i],
-                                               sym_flags);
-                        if (!ret)
-                                return TRACE_TYPE_PARTIAL_LINE;
+        if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+                if (iter->iter_flags & TRACE_FILE_LAT_FMT) {
+                        if (!trace_print_lat_context(iter))
+                                goto partial;
+                } else {
+                        if (!trace_print_context(iter))
+                                goto partial;
                 }
-                ret = trace_seq_puts(s, "\n");
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-                break;
-        }
-        case TRACE_PRINT: {
-                struct print_entry *field;
-
-                trace_assign_type(field, entry);
-
-                seq_print_ip_sym(s, field->ip, sym_flags);
-                trace_seq_printf(s, ": %s", field->buf);
-                if (entry->flags & TRACE_FLAG_CONT)
-                        trace_seq_print_cont(s, iter);
-                break;
-        }
-        case TRACE_GRAPH_RET: {
-                return print_graph_function(iter);
-        }
-        case TRACE_GRAPH_ENT: {
-                return print_graph_function(iter);
         }
-        case TRACE_BRANCH: {
-                struct trace_branch *field;
 
-                trace_assign_type(field, entry);
-
-                trace_seq_printf(s, "[%s] %s:%s:%d\n",
-                                 field->correct ? "  ok  " : " MISS ",
-                                 field->func,
-                                 field->file,
-                                 field->line);
-                break;
-        }
-        case TRACE_USER_STACK: {
-                struct userstack_entry *field;
+        if (event)
+                return event->trace(iter, sym_flags);
 
-                trace_assign_type(field, entry);
+        if (!trace_seq_printf(s, "Unknown type %d\n", entry->type))
+                goto partial;
 
-                ret = seq_print_userip_objs(field, s, sym_flags);
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-                ret = trace_seq_putc(s, '\n');
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-                break;
-        }
-        }
         return TRACE_TYPE_HANDLED;
+partial:
+        return TRACE_TYPE_PARTIAL_LINE;
 }
 
 static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
 {
         struct trace_seq *s = &iter->seq;
         struct trace_entry *entry;
-        int ret;
-        int S, T;
+        struct trace_event *event;
 
         entry = iter->ent;
 
-        if (entry->type == TRACE_CONT)
-                return TRACE_TYPE_HANDLED;
-
-        ret = trace_seq_printf(s, "%d %d %llu ",
-                entry->pid, iter->cpu, iter->ts);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        switch (entry->type) {
-        case TRACE_FN: {
-                struct ftrace_entry *field;
-
-                trace_assign_type(field, entry);
-
-                ret = trace_seq_printf(s, "%x %x\n",
-                                        field->ip,
-                                        field->parent_ip);
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-                break;
-        }
-        case TRACE_CTX:
-        case TRACE_WAKE: {
-                struct ctx_switch_entry *field;
-
-                trace_assign_type(field, entry);
-
-                T = task_state_char(field->next_state);
-                S = entry->type == TRACE_WAKE ? '+' :
-                        task_state_char(field->prev_state);
-                ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n",
-                                       field->prev_pid,
-                                       field->prev_prio,
-                                       S,
-                                       field->next_cpu,
-                                       field->next_pid,
-                                       field->next_prio,
-                                       T);
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-                break;
+        if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+                if (!trace_seq_printf(s, "%d %d %llu ",
+                                      entry->pid, iter->cpu, iter->ts))
+                        goto partial;
         }
-        case TRACE_SPECIAL:
-        case TRACE_USER_STACK:
-        case TRACE_STACK: {
-                struct special_entry *field;
 
-                trace_assign_type(field, entry);
-
-                ret = trace_seq_printf(s, "# %ld %ld %ld\n",
-                                 field->arg1,
-                                 field->arg2,
-                                 field->arg3);
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-                break;
-        }
-        case TRACE_PRINT: {
-                struct print_entry *field;
+        event = ftrace_find_event(entry->type);
+        if (event)
+                return event->raw(iter, 0);
 
-                trace_assign_type(field, entry);
+        if (!trace_seq_printf(s, "%d ?\n", entry->type))
+                goto partial;
 
-                trace_seq_printf(s, "# %lx %s", field->ip, field->buf);
-                if (entry->flags & TRACE_FLAG_CONT)
-                        trace_seq_print_cont(s, iter);
-                break;
-        }
-        }
         return TRACE_TYPE_HANDLED;
+partial:
+        return TRACE_TYPE_PARTIAL_LINE;
 }
 
-#define SEQ_PUT_FIELD_RET(s, x)                         \
-do {                                                    \
-        if (!trace_seq_putmem(s, &(x), sizeof(x)))      \
-                return 0;                               \
-} while (0)
-
-#define SEQ_PUT_HEX_FIELD_RET(s, x)                     \
-do {                                                    \
-        BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES);     \
-        if (!trace_seq_putmem_hex(s, &(x), sizeof(x)))  \
-                return 0;                               \
-} while (0)
-
 static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
 {
         struct trace_seq *s = &iter->seq;
         unsigned char newline = '\n';
         struct trace_entry *entry;
-        int S, T;
+        struct trace_event *event;
 
         entry = iter->ent;
 
-        if (entry->type == TRACE_CONT)
-                return TRACE_TYPE_HANDLED;
-
-        SEQ_PUT_HEX_FIELD_RET(s, entry->pid);
-        SEQ_PUT_HEX_FIELD_RET(s, iter->cpu);
-        SEQ_PUT_HEX_FIELD_RET(s, iter->ts);
-
-        switch (entry->type) {
-        case TRACE_FN: {
-                struct ftrace_entry *field;
-
-                trace_assign_type(field, entry);
-
-                SEQ_PUT_HEX_FIELD_RET(s, field->ip);
-                SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
-                break;
-        }
-        case TRACE_CTX:
-        case TRACE_WAKE: {
-                struct ctx_switch_entry *field;
-
-                trace_assign_type(field, entry);
-
-                T = task_state_char(field->next_state);
-                S = entry->type == TRACE_WAKE ? '+' :
-                        task_state_char(field->prev_state);
-                SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
-                SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
-                SEQ_PUT_HEX_FIELD_RET(s, S);
-                SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
-                SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
-                SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
-                SEQ_PUT_HEX_FIELD_RET(s, T);
-                break;
+        if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+                SEQ_PUT_HEX_FIELD_RET(s, entry->pid);
+                SEQ_PUT_HEX_FIELD_RET(s, iter->cpu);
+                SEQ_PUT_HEX_FIELD_RET(s, iter->ts);
         }
-        case TRACE_SPECIAL:
-        case TRACE_USER_STACK:
-        case TRACE_STACK: {
-                struct special_entry *field;
 
-                trace_assign_type(field, entry);
-
-                SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
-                SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
-                SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
-                break;
-        }
+        event = ftrace_find_event(entry->type);
+        if (event) {
+                enum print_line_t ret = event->hex(iter, 0);
+                if (ret != TRACE_TYPE_HANDLED)
+                        return ret;
         }
-        SEQ_PUT_FIELD_RET(s, newline);
-
-        return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t print_printk_msg_only(struct trace_iterator *iter)
-{
-        struct trace_seq *s = &iter->seq;
-        struct trace_entry *entry = iter->ent;
-        struct print_entry *field;
-        int ret;
 
-        trace_assign_type(field, entry);
-
-        ret = trace_seq_printf(s, field->buf);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        if (entry->flags & TRACE_FLAG_CONT)
-                trace_seq_print_cont(s, iter);
+        SEQ_PUT_FIELD_RET(s, newline);
 
         return TRACE_TYPE_HANDLED;
 }
@@ -2292,59 +1730,37 @@ static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
 {
         struct trace_seq *s = &iter->seq;
         struct trace_entry *entry;
+        struct trace_event *event;
 
         entry = iter->ent;
 
-        if (entry->type == TRACE_CONT)
-                return TRACE_TYPE_HANDLED;
-
-        SEQ_PUT_FIELD_RET(s, entry->pid);
-        SEQ_PUT_FIELD_RET(s, entry->cpu);
-        SEQ_PUT_FIELD_RET(s, iter->ts);
-
-        switch (entry->type) {
-        case TRACE_FN: {
-                struct ftrace_entry *field;
-
-                trace_assign_type(field, entry);
-
-                SEQ_PUT_FIELD_RET(s, field->ip);
-                SEQ_PUT_FIELD_RET(s, field->parent_ip);
-                break;
-        }
-        case TRACE_CTX: {
-                struct ctx_switch_entry *field;
-
-                trace_assign_type(field, entry);
-
-                SEQ_PUT_FIELD_RET(s, field->prev_pid);
-                SEQ_PUT_FIELD_RET(s, field->prev_prio);
-                SEQ_PUT_FIELD_RET(s, field->prev_state);
-                SEQ_PUT_FIELD_RET(s, field->next_pid);
-                SEQ_PUT_FIELD_RET(s, field->next_prio);
-                SEQ_PUT_FIELD_RET(s, field->next_state);
-                break;
+        if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+                SEQ_PUT_FIELD_RET(s, entry->pid);
+                SEQ_PUT_FIELD_RET(s, iter->cpu);
+                SEQ_PUT_FIELD_RET(s, iter->ts);
         }
-        case TRACE_SPECIAL:
-        case TRACE_USER_STACK:
-        case TRACE_STACK: {
-                struct special_entry *field;
 
-                trace_assign_type(field, entry);
-
-                SEQ_PUT_FIELD_RET(s, field->arg1);
-                SEQ_PUT_FIELD_RET(s, field->arg2);
-                SEQ_PUT_FIELD_RET(s, field->arg3);
-                break;
-        }
-        }
-        return 1;
+        event = ftrace_find_event(entry->type);
+        return event ? event->binary(iter, 0) : TRACE_TYPE_HANDLED;
 }
 
 static int trace_empty(struct trace_iterator *iter)
 {
         int cpu;
 
+        /* If we are looking at one CPU buffer, only check that one */
+        if (iter->cpu_file != TRACE_PIPE_ALL_CPU) {
+                cpu = iter->cpu_file;
+                if (iter->buffer_iter[cpu]) {
+                        if (!ring_buffer_iter_empty(iter->buffer_iter[cpu]))
+                                return 0;
+                } else {
+                        if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu))
+                                return 0;
+                }
+                return 1;
+        }
+
         for_each_tracing_cpu(cpu) {
                 if (iter->buffer_iter[cpu]) {
                         if (!ring_buffer_iter_empty(iter->buffer_iter[cpu]))
@@ -2368,10 +1784,15 @@ static enum print_line_t print_trace_line(struct trace_iterator *iter)
                         return ret;
         }
 
+        if (iter->ent->type == TRACE_BPRINT &&
+                        trace_flags & TRACE_ITER_PRINTK &&
+                        trace_flags & TRACE_ITER_PRINTK_MSGONLY)
+                return trace_print_bprintk_msg_only(iter);
+
         if (iter->ent->type == TRACE_PRINT &&
                         trace_flags & TRACE_ITER_PRINTK &&
                         trace_flags & TRACE_ITER_PRINTK_MSGONLY)
-                return print_printk_msg_only(iter);
+                return trace_print_printk_msg_only(iter);
 
         if (trace_flags & TRACE_ITER_BIN)
                 return print_bin_fmt(iter);
@@ -2382,9 +1803,6 @@ static enum print_line_t print_trace_line(struct trace_iterator *iter)
         if (trace_flags & TRACE_ITER_RAW)
                 return print_raw_fmt(iter);
 
-        if (iter->iter_flags & TRACE_FILE_LAT_FMT)
-                return print_lat_fmt(iter, iter->idx, iter->cpu);
-
         return print_trace_fmt(iter);
 }
 
@@ -2426,30 +1844,45 @@ static struct seq_operations tracer_seq_ops = {
 };
 
 static struct trace_iterator *
-__tracing_open(struct inode *inode, struct file *file, int *ret)
+__tracing_open(struct inode *inode, struct file *file)
 {
+        long cpu_file = (long) inode->i_private;
+        void *fail_ret = ERR_PTR(-ENOMEM);
         struct trace_iterator *iter;
         struct seq_file *m;
-        int cpu;
+        int cpu, ret;
 
-        if (tracing_disabled) {
-                *ret = -ENODEV;
-                return NULL;
-        }
+        if (tracing_disabled)
+                return ERR_PTR(-ENODEV);
 
         iter = kzalloc(sizeof(*iter), GFP_KERNEL);
-        if (!iter) {
-                *ret = -ENOMEM;
-                goto out;
-        }
+        if (!iter)
+                return ERR_PTR(-ENOMEM);
 
+        /*
+         * We make a copy of the current tracer to avoid concurrent
+         * changes on it while we are reading.
+         */
         mutex_lock(&trace_types_lock);
+        iter->trace = kzalloc(sizeof(*iter->trace), GFP_KERNEL);
+        if (!iter->trace)
+                goto fail;
+
+        if (current_trace)
+                *iter->trace = *current_trace;
+
+        if (!alloc_cpumask_var(&iter->started, GFP_KERNEL))
+                goto fail;
+
+        cpumask_clear(iter->started);
+
         if (current_trace && current_trace->print_max)
                 iter->tr = &max_tr;
         else
-                iter->tr = inode->i_private;
-        iter->trace = current_trace;
+                iter->tr = &global_trace;
         iter->pos = -1;
+        mutex_init(&iter->mutex);
+        iter->cpu_file = cpu_file;
 
         /* Notify the tracer early; before we stop tracing. */
         if (iter->trace && iter->trace->open)
@@ -2459,20 +1892,24 @@ __tracing_open(struct inode *inode, struct file *file, int *ret)
         if (ring_buffer_overruns(iter->tr->buffer))
                 iter->iter_flags |= TRACE_FILE_ANNOTATE;
 
+        if (iter->cpu_file == TRACE_PIPE_ALL_CPU) {
+                for_each_tracing_cpu(cpu) {
 
-        for_each_tracing_cpu(cpu) {
-
+                        iter->buffer_iter[cpu] =
+                                ring_buffer_read_start(iter->tr->buffer, cpu);
+                }
+        } else {
+                cpu = iter->cpu_file;
                 iter->buffer_iter[cpu] =
-                        ring_buffer_read_start(iter->tr->buffer, cpu);
-
-                if (!iter->buffer_iter[cpu])
-                        goto fail_buffer;
+                                ring_buffer_read_start(iter->tr->buffer, cpu);
         }
 
         /* TODO stop tracer */
-        *ret = seq_open(file, &tracer_seq_ops);
-        if (*ret)
+        ret = seq_open(file, &tracer_seq_ops);
+        if (ret < 0) {
+                fail_ret = ERR_PTR(ret);
                 goto fail_buffer;
+        }
 
         m = file->private_data;
         m->private = iter;
@@ -2482,7 +1919,6 @@ __tracing_open(struct inode *inode, struct file *file, int *ret)
 
         mutex_unlock(&trace_types_lock);
 
- out:
         return iter;
 
  fail_buffer:
@@ -2490,10 +1926,13 @@ __tracing_open(struct inode *inode, struct file *file, int *ret)
                 if (iter->buffer_iter[cpu])
                         ring_buffer_read_finish(iter->buffer_iter[cpu]);
         }
+        free_cpumask_var(iter->started);
+ fail:
         mutex_unlock(&trace_types_lock);
+        kfree(iter->trace);
         kfree(iter);
 
-        return ERR_PTR(-ENOMEM);
+        return fail_ret;
 }
 
 int tracing_open_generic(struct inode *inode, struct file *filp)
@@ -2505,12 +1944,17 @@ int tracing_open_generic(struct inode *inode, struct file *filp)
         return 0;
 }
 
-int tracing_release(struct inode *inode, struct file *file)
+static int tracing_release(struct inode *inode, struct file *file)
 {
         struct seq_file *m = (struct seq_file *)file->private_data;
-        struct trace_iterator *iter = m->private;
+        struct trace_iterator *iter;
         int cpu;
 
+        if (!(file->f_mode & FMODE_READ))
+                return 0;
+
+        iter = m->private;
+
         mutex_lock(&trace_types_lock);
         for_each_tracing_cpu(cpu) {
                 if (iter->buffer_iter[cpu])
@@ -2525,33 +1969,39 @@ int tracing_release(struct inode *inode, struct file *file)
         mutex_unlock(&trace_types_lock);
 
         seq_release(inode, file);
+        mutex_destroy(&iter->mutex);
+        free_cpumask_var(iter->started);
+        kfree(iter->trace);
         kfree(iter);
         return 0;
 }
 
 static int tracing_open(struct inode *inode, struct file *file)
 {
-        int ret;
-
-        __tracing_open(inode, file, &ret);
-
-        return ret;
-}
-
-static int tracing_lt_open(struct inode *inode, struct file *file)
-{
         struct trace_iterator *iter;
-        int ret;
+        int ret = 0;
 
-        iter = __tracing_open(inode, file, &ret);
+        /* If this file was open for write, then erase contents */
+        if ((file->f_mode & FMODE_WRITE) &&
+            !(file->f_flags & O_APPEND)) {
+                long cpu = (long) inode->i_private;
 
-        if (!ret)
-                iter->iter_flags |= TRACE_FILE_LAT_FMT;
+                if (cpu == TRACE_PIPE_ALL_CPU)
+                        tracing_reset_online_cpus(&global_trace);
+                else
+                        tracing_reset(&global_trace, cpu);
+        }
 
+        if (file->f_mode & FMODE_READ) {
+                iter = __tracing_open(inode, file);
+                if (IS_ERR(iter))
+                        ret = PTR_ERR(iter);
+                else if (trace_flags & TRACE_ITER_LATENCY_FMT)
+                        iter->iter_flags |= TRACE_FILE_LAT_FMT;
+        }
         return ret;
 }
 
-
 static void *
 t_next(struct seq_file *m, void *v, loff_t *pos)
 {
@@ -2623,21 +2073,22 @@ static int show_traces_open(struct inode *inode, struct file *file)
         return ret;
 }
 
-static struct file_operations tracing_fops = {
-        .open           = tracing_open,
-        .read           = seq_read,
-        .llseek         = seq_lseek,
-        .release        = tracing_release,
-};
+static ssize_t
+tracing_write_stub(struct file *filp, const char __user *ubuf,
+                   size_t count, loff_t *ppos)
+{
+        return count;
+}
 
-static struct file_operations tracing_lt_fops = {
-        .open           = tracing_lt_open,
+static const struct file_operations tracing_fops = {
+        .open           = tracing_open,
         .read           = seq_read,
+        .write          = tracing_write_stub,
         .llseek         = seq_lseek,
         .release        = tracing_release,
 };
 
-static struct file_operations show_traces_fops = {
+static const struct file_operations show_traces_fops = {
         .open           = show_traces_open,
         .read           = seq_read,
         .release        = seq_release,
@@ -2730,7 +2181,7 @@ err_unlock:
         return err;
 }
 
-static struct file_operations tracing_cpumask_fops = {
+static const struct file_operations tracing_cpumask_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_cpumask_read,
         .write          = tracing_cpumask_write,
@@ -2740,57 +2191,62 @@ static ssize_t
 tracing_trace_options_read(struct file *filp, char __user *ubuf,
                        size_t cnt, loff_t *ppos)
 {
-        int i;
+        struct tracer_opt *trace_opts;
+        u32 tracer_flags;
+        int len = 0;
         char *buf;
         int r = 0;
-        int len = 0;
-        u32 tracer_flags = current_trace->flags->val;
-        struct tracer_opt *trace_opts = current_trace->flags->opts;
+        int i;
 
 
-        /* calulate max size */
+        /* calculate max size */
         for (i = 0; trace_options[i]; i++) {
                 len += strlen(trace_options[i]);
-                len += 3; /* "no" and space */
+                len += 3; /* "no" and newline */
         }
 
+        mutex_lock(&trace_types_lock);
+        tracer_flags = current_trace->flags->val;
+        trace_opts = current_trace->flags->opts;
+
         /*
          * Increase the size with names of options specific
          * of the current tracer.
          */
         for (i = 0; trace_opts[i].name; i++) {
                 len += strlen(trace_opts[i].name);
-                len += 3; /* "no" and space */
+                len += 3; /* "no" and newline */
         }
 
         /* +2 for \n and \0 */
         buf = kmalloc(len + 2, GFP_KERNEL);
-        if (!buf)
+        if (!buf) {
+                mutex_unlock(&trace_types_lock);
                 return -ENOMEM;
+        }
 
         for (i = 0; trace_options[i]; i++) {
                 if (trace_flags & (1 << i))
-                        r += sprintf(buf + r, "%s ", trace_options[i]);
+                        r += sprintf(buf + r, "%s\n", trace_options[i]);
                 else
-                        r += sprintf(buf + r, "no%s ", trace_options[i]);
+                        r += sprintf(buf + r, "no%s\n", trace_options[i]);
         }
 
         for (i = 0; trace_opts[i].name; i++) {
                 if (tracer_flags & trace_opts[i].bit)
-                        r += sprintf(buf + r, "%s ",
+                        r += sprintf(buf + r, "%s\n",
                                 trace_opts[i].name);
                 else
-                        r += sprintf(buf + r, "no%s ",
+                        r += sprintf(buf + r, "no%s\n",
                                 trace_opts[i].name);
         }
+        mutex_unlock(&trace_types_lock);
 
-        r += sprintf(buf + r, "\n");
         WARN_ON(r >= len + 2);
 
         r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
 
         kfree(buf);
-
         return r;
 }
 
@@ -2828,6 +2284,34 @@ static int set_tracer_option(struct tracer *trace, char *cmp, int neg)
         return 0;
 }
 
+static void set_tracer_flags(unsigned int mask, int enabled)
+{
+        /* do nothing if flag is already set */
+        if (!!(trace_flags & mask) == !!enabled)
+                return;
+
+        if (enabled)
+                trace_flags |= mask;
+        else
+                trace_flags &= ~mask;
+
+        if (mask == TRACE_ITER_GLOBAL_CLK) {
+                u64 (*func)(void);
+
+                if (enabled)
+                        func = trace_clock_global;
+                else
+                        func = trace_clock_local;
+
+                mutex_lock(&trace_types_lock);
+                ring_buffer_set_clock(global_trace.buffer, func);
+
+                if (max_tr.buffer)
+                        ring_buffer_set_clock(max_tr.buffer, func);
+                mutex_unlock(&trace_types_lock);
+        }
+}
+
 static ssize_t
 tracing_trace_options_write(struct file *filp, const char __user *ubuf,
                         size_t cnt, loff_t *ppos)
@@ -2855,17 +2339,16 @@ tracing_trace_options_write(struct file *filp, const char __user *ubuf,
                 int len = strlen(trace_options[i]);
 
                 if (strncmp(cmp, trace_options[i], len) == 0) {
-                        if (neg)
-                                trace_flags &= ~(1 << i);
-                        else
-                                trace_flags |= (1 << i);
+                        set_tracer_flags(1 << i, !neg);
                         break;
                 }
         }
 
         /* If no option could be set, test the specific tracer options */
         if (!trace_options[i]) {
+                mutex_lock(&trace_types_lock);
                 ret = set_tracer_option(current_trace, cmp, neg);
+                mutex_unlock(&trace_types_lock);
                 if (ret)
                         return ret;
         }
@@ -2875,7 +2358,7 @@ tracing_trace_options_write(struct file *filp, const char __user *ubuf,
         return cnt;
 }
 
-static struct file_operations tracing_iter_fops = {
+static const struct file_operations tracing_iter_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_trace_options_read,
         .write          = tracing_trace_options_write,
@@ -2886,9 +2369,9 @@ static const char readme_msg[] =
         "# mkdir /debug\n"
         "# mount -t debugfs nodev /debug\n\n"
         "# cat /debug/tracing/available_tracers\n"
-        "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n"
+        "wakeup preemptirqsoff preemptoff irqsoff function sched_switch nop\n\n"
         "# cat /debug/tracing/current_tracer\n"
-        "none\n"
+        "nop\n"
         "# echo sched_switch > /debug/tracing/current_tracer\n"
         "# cat /debug/tracing/current_tracer\n"
         "sched_switch\n"
@@ -2908,7 +2391,7 @@ tracing_readme_read(struct file *filp, char __user *ubuf,
                                         readme_msg, strlen(readme_msg));
 }
 
-static struct file_operations tracing_readme_fops = {
+static const struct file_operations tracing_readme_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_readme_read,
 };
@@ -2930,7 +2413,7 @@ tracing_ctrl_write(struct file *filp, const char __user *ubuf,
 {
         struct trace_array *tr = filp->private_data;
         char buf[64];
-        long val;
+        unsigned long val;
         int ret;
 
         if (cnt >= sizeof(buf))
@@ -2985,13 +2468,105 @@ tracing_set_trace_read(struct file *filp, char __user *ubuf,
         return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
 }
 
-static int tracing_set_tracer(char *buf)
+int tracer_init(struct tracer *t, struct trace_array *tr)
+{
+        tracing_reset_online_cpus(tr);
+        return t->init(tr);
+}
+
+static int tracing_resize_ring_buffer(unsigned long size)
 {
+        int ret;
+
+        /*
+         * If kernel or user changes the size of the ring buffer
+         * we use the size that was given, and we can forget about
+         * expanding it later.
+         */
+        ring_buffer_expanded = 1;
+
+        ret = ring_buffer_resize(global_trace.buffer, size);
+        if (ret < 0)
+                return ret;
+
+        ret = ring_buffer_resize(max_tr.buffer, size);
+        if (ret < 0) {
+                int r;
+
+                r = ring_buffer_resize(global_trace.buffer,
+                                       global_trace.entries);
+                if (r < 0) {
+                        /*
+                         * AARGH! We are left with different
+                         * size max buffer!!!!
+                         * The max buffer is our "snapshot" buffer.
+                         * When a tracer needs a snapshot (one of the
+                         * latency tracers), it swaps the max buffer
+                         * with the saved snap shot. We succeeded to
+                         * update the size of the main buffer, but failed to
+                         * update the size of the max buffer. But when we tried
+                         * to reset the main buffer to the original size, we
+                         * failed there too. This is very unlikely to
+                         * happen, but if it does, warn and kill all
+                         * tracing.
+                         */
+                        WARN_ON(1);
+                        tracing_disabled = 1;
+                }
+                return ret;
+        }
+
+        global_trace.entries = size;
+
+        return ret;
+}
+
+/**
+ * tracing_update_buffers - used by tracing facility to expand ring buffers
+ *
+ * To save on memory when the tracing is never used on a system with it
+ * configured in. The ring buffers are set to a minimum size. But once
+ * a user starts to use the tracing facility, then they need to grow
+ * to their default size.
+ *
+ * This function is to be called when a tracer is about to be used.
+ */
+int tracing_update_buffers(void)
+{
+        int ret = 0;
+
+        mutex_lock(&trace_types_lock);
+        if (!ring_buffer_expanded)
+                ret = tracing_resize_ring_buffer(trace_buf_size);
+        mutex_unlock(&trace_types_lock);
+
+        return ret;
+}
+
+struct trace_option_dentry;
+
+static struct trace_option_dentry *
+create_trace_option_files(struct tracer *tracer);
+
+static void
+destroy_trace_option_files(struct trace_option_dentry *topts);
+
+static int tracing_set_tracer(const char *buf)
+{
+        static struct trace_option_dentry *topts;
         struct trace_array *tr = &global_trace;
         struct tracer *t;
         int ret = 0;
 
         mutex_lock(&trace_types_lock);
+
+        if (!ring_buffer_expanded) {
+                ret = tracing_resize_ring_buffer(trace_buf_size);
+                if (ret < 0)
+                        goto out;
+                ret = 0;
+        }
+
         for (t = trace_types; t; t = t->next) {
                 if (strcmp(t->name, buf) == 0)
                         break;
@@ -3007,9 +2582,14 @@ static int tracing_set_tracer(char *buf)
         if (current_trace && current_trace->reset)
                 current_trace->reset(tr);
 
+        destroy_trace_option_files(topts);
+
         current_trace = t;
+
+        topts = create_trace_option_files(current_trace);
+
         if (t->init) {
-                ret = t->init(tr);
+                ret = tracer_init(t, tr);
                 if (ret)
                         goto out;
         }
@@ -3072,9 +2652,9 @@ static ssize_t
 tracing_max_lat_write(struct file *filp, const char __user *ubuf,
                       size_t cnt, loff_t *ppos)
 {
-        long *ptr = filp->private_data;
+        unsigned long *ptr = filp->private_data;
         char buf[64];
-        long val;
+        unsigned long val;
         int ret;
 
         if (cnt >= sizeof(buf))
@@ -3094,54 +2674,96 @@ tracing_max_lat_write(struct file *filp, const char __user *ubuf,
         return cnt;
 }
 
-static atomic_t tracing_reader;
-
 static int tracing_open_pipe(struct inode *inode, struct file *filp)
 {
+        long cpu_file = (long) inode->i_private;
         struct trace_iterator *iter;
+        int ret = 0;
 
         if (tracing_disabled)
                 return -ENODEV;
 
-        /* We only allow for reader of the pipe */
-        if (atomic_inc_return(&tracing_reader) != 1) {
-                atomic_dec(&tracing_reader);
-                return -EBUSY;
+        mutex_lock(&trace_types_lock);
+
+        /* We only allow one reader per cpu */
+        if (cpu_file == TRACE_PIPE_ALL_CPU) {
+                if (!cpumask_empty(tracing_reader_cpumask)) {
+                        ret = -EBUSY;
+                        goto out;
+                }
+                cpumask_setall(tracing_reader_cpumask);
+        } else {
+                if (!cpumask_test_cpu(cpu_file, tracing_reader_cpumask))
+                        cpumask_set_cpu(cpu_file, tracing_reader_cpumask);
+                else {
+                        ret = -EBUSY;
+                        goto out;
+                }
         }
 
         /* create a buffer to store the information to pass to userspace */
         iter = kzalloc(sizeof(*iter), GFP_KERNEL);
-        if (!iter)
-                return -ENOMEM;
+        if (!iter) {
+                ret = -ENOMEM;
+                goto out;
+        }
 
-        if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) {
-                kfree(iter);
-                return -ENOMEM;
+        /*
+         * We make a copy of the current tracer to avoid concurrent
+         * changes on it while we are reading.
+         */
+        iter->trace = kmalloc(sizeof(*iter->trace), GFP_KERNEL);
+        if (!iter->trace) {
+                ret = -ENOMEM;
+                goto fail;
         }
+        if (current_trace)
+                *iter->trace = *current_trace;
 
-        mutex_lock(&trace_types_lock);
+        if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) {
+                ret = -ENOMEM;
+                goto fail;
+        }
 
         /* trace pipe does not show start of buffer */
         cpumask_setall(iter->started);
 
+        iter->cpu_file = cpu_file;
         iter->tr = &global_trace;
-        iter->trace = current_trace;
+        mutex_init(&iter->mutex);
         filp->private_data = iter;
 
         if (iter->trace->pipe_open)
                 iter->trace->pipe_open(iter);
+
+out:
         mutex_unlock(&trace_types_lock);
+        return ret;
 
-        return 0;
+fail:
+        kfree(iter->trace);
+        kfree(iter);
+        mutex_unlock(&trace_types_lock);
+        return ret;
 }
 
 static int tracing_release_pipe(struct inode *inode, struct file *file)
 {
         struct trace_iterator *iter = file->private_data;
 
+        mutex_lock(&trace_types_lock);
+
+        if (iter->cpu_file == TRACE_PIPE_ALL_CPU)
+                cpumask_clear(tracing_reader_cpumask);
+        else
+                cpumask_clear_cpu(iter->cpu_file, tracing_reader_cpumask);
+
+        mutex_unlock(&trace_types_lock);
+
         free_cpumask_var(iter->started);
+        mutex_destroy(&iter->mutex);
+        kfree(iter->trace);
         kfree(iter);
-        atomic_dec(&tracing_reader);
 
         return 0;
 }
@@ -3167,67 +2789,57 @@ tracing_poll_pipe(struct file *filp, poll_table *poll_table)
         }
 }
 
-/*
- * Consumer reader.
- */
-static ssize_t
-tracing_read_pipe(struct file *filp, char __user *ubuf,
-                  size_t cnt, loff_t *ppos)
+
+void default_wait_pipe(struct trace_iterator *iter)
 {
-        struct trace_iterator *iter = filp->private_data;
-        ssize_t sret;
+        DEFINE_WAIT(wait);
 
-        /* return any leftover data */
-        sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
-        if (sret != -EBUSY)
-                return sret;
+        prepare_to_wait(&trace_wait, &wait, TASK_INTERRUPTIBLE);
 
-        trace_seq_reset(&iter->seq);
+        if (trace_empty(iter))
+                schedule();
 
-        mutex_lock(&trace_types_lock);
-        if (iter->trace->read) {
-                sret = iter->trace->read(iter, filp, ubuf, cnt, ppos);
-                if (sret)
-                        goto out;
-        }
+        finish_wait(&trace_wait, &wait);
+}
+
+/*
+ * This is a make-shift waitqueue.
+ * A tracer might use this callback on some rare cases:
+ *
+ *  1) the current tracer might hold the runqueue lock when it wakes up
+ *     a reader, hence a deadlock (sched, function, and function graph tracers)
+ *  2) the function tracers, trace all functions, we don't want
+ *     the overhead of calling wake_up and friends
+ *     (and tracing them too)
+ *
+ *     Anyway, this is really very primitive wakeup.
+ */
+void poll_wait_pipe(struct trace_iterator *iter)
+{
+        set_current_state(TASK_INTERRUPTIBLE);
+        /* sleep for 100 msecs, and try again. */
+        schedule_timeout(HZ / 10);
+}
+
+/* Must be called with trace_types_lock mutex held. */
+static int tracing_wait_pipe(struct file *filp)
+{
+        struct trace_iterator *iter = filp->private_data;
 
-waitagain:
-        sret = 0;
         while (trace_empty(iter)) {
 
                 if ((filp->f_flags & O_NONBLOCK)) {
-                        sret = -EAGAIN;
-                        goto out;
+                        return -EAGAIN;
                 }
 
-                /*
-                 * This is a make-shift waitqueue. The reason we don't use
-                 * an actual wait queue is because:
-                 *  1) we only ever have one waiter
-                 *  2) the tracing, traces all functions, we don't want
-                 *     the overhead of calling wake_up and friends
-                 *     (and tracing them too)
-                 *     Anyway, this is really very primitive wakeup.
-                 */
-                set_current_state(TASK_INTERRUPTIBLE);
-                iter->tr->waiter = current;
-
-                mutex_unlock(&trace_types_lock);
-
-                /* sleep for 100 msecs, and try again. */
-                schedule_timeout(HZ/10);
+                mutex_unlock(&iter->mutex);
 
-                mutex_lock(&trace_types_lock);
+                iter->trace->wait_pipe(iter);
 
-                iter->tr->waiter = NULL;
-
-                if (signal_pending(current)) {
-                        sret = -EINTR;
-                        goto out;
-                }
+                mutex_lock(&iter->mutex);
 
-                if (iter->trace != current_trace)
-                        goto out;
+                if (signal_pending(current))
+                        return -EINTR;
 
                 /*
                  * We block until we read something and tracing is disabled.
@@ -3240,13 +2852,59 @@ waitagain:
                  */
                 if (!tracer_enabled && iter->pos)
                         break;
+        }
+
+        return 1;
+}
 
-                continue;
+/*
+ * Consumer reader.
+ */
+static ssize_t
+tracing_read_pipe(struct file *filp, char __user *ubuf,
+                  size_t cnt, loff_t *ppos)
+{
+        struct trace_iterator *iter = filp->private_data;
+        static struct tracer *old_tracer;
+        ssize_t sret;
+
+        /* return any leftover data */
+        sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
+        if (sret != -EBUSY)
+                return sret;
+
+        trace_seq_init(&iter->seq);
+
+        /* copy the tracer to avoid using a global lock all around */
+        mutex_lock(&trace_types_lock);
+        if (unlikely(old_tracer != current_trace && current_trace)) {
+                old_tracer = current_trace;
+                *iter->trace = *current_trace;
+        }
+        mutex_unlock(&trace_types_lock);
+
+        /*
+         * Avoid more than one consumer on a single file descriptor
+         * This is just a matter of traces coherency, the ring buffer itself
+         * is protected.
+         */
+        mutex_lock(&iter->mutex);
+        if (iter->trace->read) {
+                sret = iter->trace->read(iter, filp, ubuf, cnt, ppos);
+                if (sret)
+                        goto out;
         }
 
+waitagain:
+        sret = tracing_wait_pipe(filp);
+        if (sret <= 0)
+                goto out;
+
         /* stop when tracing is finished */
-        if (trace_empty(iter))
+        if (trace_empty(iter)) {
+                sret = 0;
                 goto out;
+        }
 
         if (cnt >= PAGE_SIZE)
                 cnt = PAGE_SIZE - 1;
@@ -3267,8 +2925,8 @@ waitagain:
                         iter->seq.len = len;
                         break;
                 }
-
-                trace_consume(iter);
+                if (ret != TRACE_TYPE_NO_CONSUME)
+                        trace_consume(iter);
 
                 if (iter->seq.len >= cnt)
                         break;
@@ -3277,7 +2935,7 @@ waitagain:
         /* Now copy what we have to the user */
         sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
         if (iter->seq.readpos >= iter->seq.len)
-                trace_seq_reset(&iter->seq);
+                trace_seq_init(&iter->seq);
 
         /*
          * If there was nothing to send to user, inspite of consuming trace
@@ -3287,20 +2945,165 @@ waitagain:
                 goto waitagain;
 
 out:
-        mutex_unlock(&trace_types_lock);
+        mutex_unlock(&iter->mutex);
 
         return sret;
 }
 
+static void tracing_pipe_buf_release(struct pipe_inode_info *pipe,
+                                     struct pipe_buffer *buf)
+{
+        __free_page(buf->page);
+}
+
+static void tracing_spd_release_pipe(struct splice_pipe_desc *spd,
+                                     unsigned int idx)
+{
+        __free_page(spd->pages[idx]);
+}
+
+static struct pipe_buf_operations tracing_pipe_buf_ops = {
+        .can_merge              = 0,
+        .map                    = generic_pipe_buf_map,
+        .unmap                  = generic_pipe_buf_unmap,
+        .confirm                = generic_pipe_buf_confirm,
+        .release                = tracing_pipe_buf_release,
+        .steal                  = generic_pipe_buf_steal,
+        .get                    = generic_pipe_buf_get,
+};
+
+static size_t
+tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter)
+{
+        size_t count;
+        int ret;
+
+        /* Seq buffer is page-sized, exactly what we need. */
+        for (;;) {
+                count = iter->seq.len;
+                ret = print_trace_line(iter);
+                count = iter->seq.len - count;
+                if (rem < count) {
+                        rem = 0;
+                        iter->seq.len -= count;
+                        break;
+                }
+                if (ret == TRACE_TYPE_PARTIAL_LINE) {
+                        iter->seq.len -= count;
+                        break;
+                }
+
+                trace_consume(iter);
+                rem -= count;
+                if (!find_next_entry_inc(iter)) {
+                        rem = 0;
+                        iter->ent = NULL;
+                        break;
+                }
+        }
+
+        return rem;
+}
+
+static ssize_t tracing_splice_read_pipe(struct file *filp,
+                                        loff_t *ppos,
+                                        struct pipe_inode_info *pipe,
+                                        size_t len,
+                                        unsigned int flags)
+{
+        struct page *pages[PIPE_BUFFERS];
+        struct partial_page partial[PIPE_BUFFERS];
+        struct trace_iterator *iter = filp->private_data;
+        struct splice_pipe_desc spd = {
+                .pages          = pages,
+                .partial        = partial,
+                .nr_pages       = 0, /* This gets updated below. */
+                .flags          = flags,
+                .ops            = &tracing_pipe_buf_ops,
+                .spd_release    = tracing_spd_release_pipe,
+        };
+        static struct tracer *old_tracer;
+        ssize_t ret;
+        size_t rem;
+        unsigned int i;
+
+        /* copy the tracer to avoid using a global lock all around */
+        mutex_lock(&trace_types_lock);
+        if (unlikely(old_tracer != current_trace && current_trace)) {
+                old_tracer = current_trace;
+                *iter->trace = *current_trace;
+        }
+        mutex_unlock(&trace_types_lock);
+
+        mutex_lock(&iter->mutex);
+
+        if (iter->trace->splice_read) {
+                ret = iter->trace->splice_read(iter, filp,
+                                               ppos, pipe, len, flags);
+                if (ret)
+                        goto out_err;
+        }
+
+        ret = tracing_wait_pipe(filp);
+        if (ret <= 0)
+                goto out_err;
+
+        if (!iter->ent && !find_next_entry_inc(iter)) {
+                ret = -EFAULT;
+                goto out_err;
+        }
+
+        /* Fill as many pages as possible. */
+        for (i = 0, rem = len; i < PIPE_BUFFERS && rem; i++) {
+                pages[i] = alloc_page(GFP_KERNEL);
+                if (!pages[i])
+                        break;
+
+                rem = tracing_fill_pipe_page(rem, iter);
+
+                /* Copy the data into the page, so we can start over. */
+                ret = trace_seq_to_buffer(&iter->seq,
+                                          page_address(pages[i]),
+                                          iter->seq.len);
+                if (ret < 0) {
+                        __free_page(pages[i]);
+                        break;
+                }
+                partial[i].offset = 0;
+                partial[i].len = iter->seq.len;
+
+                trace_seq_init(&iter->seq);
+        }
+
+        mutex_unlock(&iter->mutex);
+
+        spd.nr_pages = i;
+
+        return splice_to_pipe(pipe, &spd);
+
+out_err:
+        mutex_unlock(&iter->mutex);
+
+        return ret;
+}
+
 static ssize_t
 tracing_entries_read(struct file *filp, char __user *ubuf,
                      size_t cnt, loff_t *ppos)
 {
         struct trace_array *tr = filp->private_data;
-        char buf[64];
+        char buf[96];
         int r;
 
-        r = sprintf(buf, "%lu\n", tr->entries >> 10);
+        mutex_lock(&trace_types_lock);
+        if (!ring_buffer_expanded)
+                r = sprintf(buf, "%lu (expanded: %lu)\n",
+                            tr->entries >> 10,
+                            trace_buf_size >> 10);
+        else
+                r = sprintf(buf, "%lu\n", tr->entries >> 10);
+        mutex_unlock(&trace_types_lock);
+
         return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
 }
 
@@ -3344,28 +3147,11 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
         val <<= 10;
 
         if (val != global_trace.entries) {
-                ret = ring_buffer_resize(global_trace.buffer, val);
-                if (ret < 0) {
-                        cnt = ret;
-                        goto out;
-                }
-
-                ret = ring_buffer_resize(max_tr.buffer, val);
+                ret = tracing_resize_ring_buffer(val);
                 if (ret < 0) {
-                        int r;
                         cnt = ret;
-                        r = ring_buffer_resize(global_trace.buffer,
-                                               global_trace.entries);
-                        if (r < 0) {
-                                /* AARGH! We are left with different
-                                 * size max buffer!!!! */
-                                WARN_ON(1);
-                                tracing_disabled = 1;
-                        }
                         goto out;
                 }
-
-                global_trace.entries = val;
         }
 
         filp->f_pos += cnt;
@@ -3393,7 +3179,7 @@ static int mark_printk(const char *fmt, ...)
         int ret;
         va_list args;
         va_start(args, fmt);
-        ret = trace_vprintk(0, -1, fmt, args);
+        ret = trace_vprintk(0, fmt, args);
         va_end(args);
         return ret;
 }
@@ -3433,42 +3219,288 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
         return cnt;
 }
 
-static struct file_operations tracing_max_lat_fops = {
+static const struct file_operations tracing_max_lat_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_max_lat_read,
         .write          = tracing_max_lat_write,
 };
 
-static struct file_operations tracing_ctrl_fops = {
+static const struct file_operations tracing_ctrl_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_ctrl_read,
         .write          = tracing_ctrl_write,
 };
 
-static struct file_operations set_tracer_fops = {
+static const struct file_operations set_tracer_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_set_trace_read,
         .write          = tracing_set_trace_write,
 };
 
-static struct file_operations tracing_pipe_fops = {
+static const struct file_operations tracing_pipe_fops = {
         .open           = tracing_open_pipe,
         .poll           = tracing_poll_pipe,
         .read           = tracing_read_pipe,
+        .splice_read    = tracing_splice_read_pipe,
         .release        = tracing_release_pipe,
 };
 
-static struct file_operations tracing_entries_fops = {
+static const struct file_operations tracing_entries_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_entries_read,
         .write          = tracing_entries_write,
 };
 
-static struct file_operations tracing_mark_fops = {
+static const struct file_operations tracing_mark_fops = {
         .open           = tracing_open_generic,
         .write          = tracing_mark_write,
 };
 
+struct ftrace_buffer_info {
+        struct trace_array      *tr;
+        void                    *spare;
+        int                     cpu;
+        unsigned int            read;
+};
+
+static int tracing_buffers_open(struct inode *inode, struct file *filp)
+{
+        int cpu = (int)(long)inode->i_private;
+        struct ftrace_buffer_info *info;
+
+        if (tracing_disabled)
+                return -ENODEV;
+
+        info = kzalloc(sizeof(*info), GFP_KERNEL);
+        if (!info)
+                return -ENOMEM;
+
+        info->tr        = &global_trace;
+        info->cpu       = cpu;
+        info->spare     = ring_buffer_alloc_read_page(info->tr->buffer);
+        /* Force reading ring buffer for first read */
+        info->read      = (unsigned int)-1;
+        if (!info->spare)
+                goto out;
+
+        filp->private_data = info;
+
+        return 0;
+
+ out:
+        kfree(info);
+        return -ENOMEM;
+}
+
+static ssize_t
+tracing_buffers_read(struct file *filp, char __user *ubuf,
+                     size_t count, loff_t *ppos)
+{
+        struct ftrace_buffer_info *info = filp->private_data;
+        unsigned int pos;
+        ssize_t ret;
+        size_t size;
+
+        if (!count)
+                return 0;
+
+        /* Do we have previous read data to read? */
+        if (info->read < PAGE_SIZE)
+                goto read;
+
+        info->read = 0;
+
+        ret = ring_buffer_read_page(info->tr->buffer,
+                                    &info->spare,
+                                    count,
+                                    info->cpu, 0);
+        if (ret < 0)
+                return 0;
+
+        pos = ring_buffer_page_len(info->spare);
+
+        if (pos < PAGE_SIZE)
+                memset(info->spare + pos, 0, PAGE_SIZE - pos);
+
+read:
+        size = PAGE_SIZE - info->read;
+        if (size > count)
+                size = count;
+
+        ret = copy_to_user(ubuf, info->spare + info->read, size);
+        if (ret == size)
+                return -EFAULT;
+        size -= ret;
+
+        *ppos += size;
+        info->read += size;
+
+        return size;
+}
+
+static int tracing_buffers_release(struct inode *inode, struct file *file)
+{
+        struct ftrace_buffer_info *info = file->private_data;
+
+        ring_buffer_free_read_page(info->tr->buffer, info->spare);
+        kfree(info);
+
+        return 0;
+}
+
+struct buffer_ref {
+        struct ring_buffer      *buffer;
+        void                    *page;
+        int                     ref;
+};
+
+static void buffer_pipe_buf_release(struct pipe_inode_info *pipe,
+                                    struct pipe_buffer *buf)
+{
+        struct buffer_ref *ref = (struct buffer_ref *)buf->private;
+
+        if (--ref->ref)
+                return;
+
+        ring_buffer_free_read_page(ref->buffer, ref->page);
+        kfree(ref);
+        buf->private = 0;
+}
+
+static int buffer_pipe_buf_steal(struct pipe_inode_info *pipe,
+                                 struct pipe_buffer *buf)
+{
+        return 1;
+}
+
+static void buffer_pipe_buf_get(struct pipe_inode_info *pipe,
+                                struct pipe_buffer *buf)
+{
+        struct buffer_ref *ref = (struct buffer_ref *)buf->private;
+
+        ref->ref++;
+}
+
+/* Pipe buffer operations for a buffer. */
+static struct pipe_buf_operations buffer_pipe_buf_ops = {
+        .can_merge              = 0,
+        .map                    = generic_pipe_buf_map,
+        .unmap                  = generic_pipe_buf_unmap,
+        .confirm                = generic_pipe_buf_confirm,
+        .release                = buffer_pipe_buf_release,
+        .steal                  = buffer_pipe_buf_steal,
+        .get                    = buffer_pipe_buf_get,
+};
+
+/*
+ * Callback from splice_to_pipe(), if we need to release some pages
+ * at the end of the spd in case we error'ed out in filling the pipe.
+ */
+static void buffer_spd_release(struct splice_pipe_desc *spd, unsigned int i)
+{
+        struct buffer_ref *ref =
+                (struct buffer_ref *)spd->partial[i].private;
+
+        if (--ref->ref)
+                return;
+
+        ring_buffer_free_read_page(ref->buffer, ref->page);
+        kfree(ref);
+        spd->partial[i].private = 0;
+}
+
+static ssize_t
+tracing_buffers_splice_read(struct file *file, loff_t *ppos,
+                            struct pipe_inode_info *pipe, size_t len,
+                            unsigned int flags)
+{
+        struct ftrace_buffer_info *info = file->private_data;
+        struct partial_page partial[PIPE_BUFFERS];
+        struct page *pages[PIPE_BUFFERS];
+        struct splice_pipe_desc spd = {
+                .pages          = pages,
+                .partial        = partial,
+                .flags          = flags,
+                .ops            = &buffer_pipe_buf_ops,
+                .spd_release    = buffer_spd_release,
+        };
+        struct buffer_ref *ref;
+        int size, i;
+        size_t ret;
+
+        /*
+         * We can't seek on a buffer input
+         */
+        if (unlikely(*ppos))
+                return -ESPIPE;
+
+
+        for (i = 0; i < PIPE_BUFFERS && len; i++, len -= size) {
+                struct page *page;
+                int r;
+
+                ref = kzalloc(sizeof(*ref), GFP_KERNEL);
+                if (!ref)
+                        break;
+
+                ref->buffer = info->tr->buffer;
+                ref->page = ring_buffer_alloc_read_page(ref->buffer);
+                if (!ref->page) {
+                        kfree(ref);
+                        break;
+                }
+
+                r = ring_buffer_read_page(ref->buffer, &ref->page,
+                                          len, info->cpu, 0);
+                if (r < 0) {
+                        ring_buffer_free_read_page(ref->buffer,
+                                                   ref->page);
+                        kfree(ref);
+                        break;
+                }
+
+                /*
+                 * zero out any left over data, this is going to
+                 * user land.
+                 */
+                size = ring_buffer_page_len(ref->page);
+                if (size < PAGE_SIZE)
+                        memset(ref->page + size, 0, PAGE_SIZE - size);
+
+                page = virt_to_page(ref->page);
+
+                spd.pages[i] = page;
+                spd.partial[i].len = PAGE_SIZE;
+                spd.partial[i].offset = 0;
+                spd.partial[i].private = (unsigned long)ref;
+                spd.nr_pages++;
+        }
+
+        spd.nr_pages = i;
+
+        /* did we read anything? */
+        if (!spd.nr_pages) {
+                if (flags & SPLICE_F_NONBLOCK)
+                        ret = -EAGAIN;
+                else
+                        ret = 0;
+                /* TODO: block */
+                return ret;
+        }
+
+        ret = splice_to_pipe(pipe, &spd);
+
+        return ret;
+}
+
+static const struct file_operations tracing_buffers_fops = {
+        .open           = tracing_buffers_open,
+        .read           = tracing_buffers_read,
+        .release        = tracing_buffers_release,
+        .splice_read    = tracing_buffers_splice_read,
+        .llseek         = no_llseek,
+};
+
 #ifdef CONFIG_DYNAMIC_FTRACE
 
 int __weak ftrace_arch_read_dyn_info(char *buf, int size)
@@ -3500,7 +3532,7 @@ tracing_read_dyn_info(struct file *filp, char __user *ubuf,
         return r;
 }
 
-static struct file_operations tracing_dyn_info_fops = {
+static const struct file_operations tracing_dyn_info_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_read_dyn_info,
 };
@@ -3515,6 +3547,9 @@ struct dentry *tracing_init_dentry(void)
         if (d_tracer)
                 return d_tracer;
 
+        if (!debugfs_initialized())
+                return NULL;
+
         d_tracer = debugfs_create_dir("tracing", NULL);
 
         if (!d_tracer && !once) {
@@ -3526,15 +3561,350 @@ struct dentry *tracing_init_dentry(void)
         return d_tracer;
 }
 
+static struct dentry *d_percpu;
+
+struct dentry *tracing_dentry_percpu(void)
+{
+        static int once;
+        struct dentry *d_tracer;
+
+        if (d_percpu)
+                return d_percpu;
+
+        d_tracer = tracing_init_dentry();
+
+        if (!d_tracer)
+                return NULL;
+
+        d_percpu = debugfs_create_dir("per_cpu", d_tracer);
+
+        if (!d_percpu && !once) {
+                once = 1;
+                pr_warning("Could not create debugfs directory 'per_cpu'\n");
+                return NULL;
+        }
+
+        return d_percpu;
+}
+
+static void tracing_init_debugfs_percpu(long cpu)
+{
+        struct dentry *d_percpu = tracing_dentry_percpu();
+        struct dentry *entry, *d_cpu;
+        /* strlen(cpu) + MAX(log10(cpu)) + '\0' */
+        char cpu_dir[7];
+
+        if (cpu > 999 || cpu < 0)
+                return;
+
+        sprintf(cpu_dir, "cpu%ld", cpu);
+        d_cpu = debugfs_create_dir(cpu_dir, d_percpu);
+        if (!d_cpu) {
+                pr_warning("Could not create debugfs '%s' entry\n", cpu_dir);
+                return;
+        }
+
+        /* per cpu trace_pipe */
+        entry = debugfs_create_file("trace_pipe", 0444, d_cpu,
+                                (void *) cpu, &tracing_pipe_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs 'trace_pipe' entry\n");
+
+        /* per cpu trace */
+        entry = debugfs_create_file("trace", 0644, d_cpu,
+                                (void *) cpu, &tracing_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs 'trace' entry\n");
+
+        entry = debugfs_create_file("trace_pipe_raw", 0444, d_cpu,
+                                    (void *) cpu, &tracing_buffers_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs 'trace_pipe_raw' entry\n");
+}
+
 #ifdef CONFIG_FTRACE_SELFTEST
 /* Let selftest have access to static functions in this file */
 #include "trace_selftest.c"
 #endif
 
+struct trace_option_dentry {
+        struct tracer_opt               *opt;
+        struct tracer_flags             *flags;
+        struct dentry                   *entry;
+};
+
+static ssize_t
+trace_options_read(struct file *filp, char __user *ubuf, size_t cnt,
+                        loff_t *ppos)
+{
+        struct trace_option_dentry *topt = filp->private_data;
+        char *buf;
+
+        if (topt->flags->val & topt->opt->bit)
+                buf = "1\n";
+        else
+                buf = "0\n";
+
+        return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
+}
+
+static ssize_t
+trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt,
+                         loff_t *ppos)
+{
+        struct trace_option_dentry *topt = filp->private_data;
+        unsigned long val;
+        char buf[64];
+        int ret;
+
+        if (cnt >= sizeof(buf))
+                return -EINVAL;
+
+        if (copy_from_user(&buf, ubuf, cnt))
+                return -EFAULT;
+
+        buf[cnt] = 0;
+
+        ret = strict_strtoul(buf, 10, &val);
+        if (ret < 0)
+                return ret;
+
+        ret = 0;
+        switch (val) {
+        case 0:
+                /* do nothing if already cleared */
+                if (!(topt->flags->val & topt->opt->bit))
+                        break;
+
+                mutex_lock(&trace_types_lock);
+                if (current_trace->set_flag)
+                        ret = current_trace->set_flag(topt->flags->val,
+                                                      topt->opt->bit, 0);
+                mutex_unlock(&trace_types_lock);
+                if (ret)
+                        return ret;
+                topt->flags->val &= ~topt->opt->bit;
+                break;
+        case 1:
+                /* do nothing if already set */
+                if (topt->flags->val & topt->opt->bit)
+                        break;
+
+                mutex_lock(&trace_types_lock);
+                if (current_trace->set_flag)
+                        ret = current_trace->set_flag(topt->flags->val,
+                                                      topt->opt->bit, 1);
+                mutex_unlock(&trace_types_lock);
+                if (ret)
+                        return ret;
+                topt->flags->val |= topt->opt->bit;
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        *ppos += cnt;
+
+        return cnt;
+}
+
+
+static const struct file_operations trace_options_fops = {
+        .open = tracing_open_generic,
+        .read = trace_options_read,
+        .write = trace_options_write,
+};
+
+static ssize_t
+trace_options_core_read(struct file *filp, char __user *ubuf, size_t cnt,
+                        loff_t *ppos)
+{
+        long index = (long)filp->private_data;
+        char *buf;
+
+        if (trace_flags & (1 << index))
+                buf = "1\n";
+        else
+                buf = "0\n";
+
+        return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
+}
+
+static ssize_t
+trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt,
+                         loff_t *ppos)
+{
+        long index = (long)filp->private_data;
+        char buf[64];
+        unsigned long val;
+        int ret;
+
+        if (cnt >= sizeof(buf))
+                return -EINVAL;
+
+        if (copy_from_user(&buf, ubuf, cnt))
+                return -EFAULT;
+
+        buf[cnt] = 0;
+
+        ret = strict_strtoul(buf, 10, &val);
+        if (ret < 0)
+                return ret;
+
+        switch (val) {
+        case 0:
+                trace_flags &= ~(1 << index);
+                break;
+        case 1:
+                trace_flags |= 1 << index;
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        *ppos += cnt;
+
+        return cnt;
+}
+
+static const struct file_operations trace_options_core_fops = {
+        .open = tracing_open_generic,
+        .read = trace_options_core_read,
+        .write = trace_options_core_write,
+};
+
+static struct dentry *trace_options_init_dentry(void)
+{
+        struct dentry *d_tracer;
+        static struct dentry *t_options;
+
+        if (t_options)
+                return t_options;
+
+        d_tracer = tracing_init_dentry();
+        if (!d_tracer)
+                return NULL;
+
+        t_options = debugfs_create_dir("options", d_tracer);
+        if (!t_options) {
+                pr_warning("Could not create debugfs directory 'options'\n");
+                return NULL;
+        }
+
+        return t_options;
+}
+
+static void
+create_trace_option_file(struct trace_option_dentry *topt,
+                         struct tracer_flags *flags,
+                         struct tracer_opt *opt)
+{
+        struct dentry *t_options;
+        struct dentry *entry;
+
+        t_options = trace_options_init_dentry();
+        if (!t_options)
+                return;
+
+        topt->flags = flags;
+        topt->opt = opt;
+
+        entry = debugfs_create_file(opt->name, 0644, t_options, topt,
+                                    &trace_options_fops);
+
+        topt->entry = entry;
+
+}
+
+static struct trace_option_dentry *
+create_trace_option_files(struct tracer *tracer)
+{
+        struct trace_option_dentry *topts;
+        struct tracer_flags *flags;
+        struct tracer_opt *opts;
+        int cnt;
+
+        if (!tracer)
+                return NULL;
+
+        flags = tracer->flags;
+
+        if (!flags || !flags->opts)
+                return NULL;
+
+        opts = flags->opts;
+
+        for (cnt = 0; opts[cnt].name; cnt++)
+                ;
+
+        topts = kcalloc(cnt + 1, sizeof(*topts), GFP_KERNEL);
+        if (!topts)
+                return NULL;
+
+        for (cnt = 0; opts[cnt].name; cnt++)
+                create_trace_option_file(&topts[cnt], flags,
+                                         &opts[cnt]);
+
+        return topts;
+}
+
+static void
+destroy_trace_option_files(struct trace_option_dentry *topts)
+{
+        int cnt;
+
+        if (!topts)
+                return;
+
+        for (cnt = 0; topts[cnt].opt; cnt++) {
+                if (topts[cnt].entry)
+                        debugfs_remove(topts[cnt].entry);
+        }
+
+        kfree(topts);
+}
+
+static struct dentry *
+create_trace_option_core_file(const char *option, long index)
+{
+        struct dentry *t_options;
+        struct dentry *entry;
+
+        t_options = trace_options_init_dentry();
+        if (!t_options)
+                return NULL;
+
+        entry = debugfs_create_file(option, 0644, t_options, (void *)index,
+                                    &trace_options_core_fops);
+
+        return entry;
+}
+
+static __init void create_trace_options_dir(void)
+{
+        struct dentry *t_options;
+        struct dentry *entry;
+        int i;
+
+        t_options = trace_options_init_dentry();
+        if (!t_options)
+                return;
+
+        for (i = 0; trace_options[i]; i++) {
+                entry = create_trace_option_core_file(trace_options[i], i);
+                if (!entry)
+                        pr_warning("Could not create debugfs %s entry\n",
+                                   trace_options[i]);
+        }
+}
+
 static __init int tracer_init_debugfs(void)
 {
         struct dentry *d_tracer;
         struct dentry *entry;
+        int cpu;
 
         d_tracer = tracing_init_dentry();
 
@@ -3548,18 +3918,15 @@ static __init int tracer_init_debugfs(void)
         if (!entry)
                 pr_warning("Could not create debugfs 'trace_options' entry\n");
 
+        create_trace_options_dir();
+
         entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer,
                                     NULL, &tracing_cpumask_fops);
         if (!entry)
                 pr_warning("Could not create debugfs 'tracing_cpumask' entry\n");
 
-        entry = debugfs_create_file("latency_trace", 0444, d_tracer,
-                                    &global_trace, &tracing_lt_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'latency_trace' entry\n");
-
-        entry = debugfs_create_file("trace", 0444, d_tracer,
-                                    &global_trace, &tracing_fops);
+        entry = debugfs_create_file("trace", 0644, d_tracer,
+                                 (void *) TRACE_PIPE_ALL_CPU, &tracing_fops);
         if (!entry)
                 pr_warning("Could not create debugfs 'trace' entry\n");
 
@@ -3590,8 +3957,8 @@ static __init int tracer_init_debugfs(void)
         if (!entry)
                 pr_warning("Could not create debugfs 'README' entry\n");
 
-        entry = debugfs_create_file("trace_pipe", 0644, d_tracer,
-                                    NULL, &tracing_pipe_fops);
+        entry = debugfs_create_file("trace_pipe", 0444, d_tracer,
+                        (void *) TRACE_PIPE_ALL_CPU, &tracing_pipe_fops);
         if (!entry)
                 pr_warning("Could not create debugfs "
                            "'trace_pipe' entry\n");
@@ -3619,77 +3986,12 @@ static __init int tracer_init_debugfs(void)
 #ifdef CONFIG_SYSPROF_TRACER
         init_tracer_sysprof_debugfs(d_tracer);
 #endif
-        return 0;
-}
-
-int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args)
-{
-        static DEFINE_SPINLOCK(trace_buf_lock);
-        static char trace_buf[TRACE_BUF_SIZE];
-
-        struct ring_buffer_event *event;
-        struct trace_array *tr = &global_trace;
-        struct trace_array_cpu *data;
-        int cpu, len = 0, size, pc;
-        struct print_entry *entry;
-        unsigned long irq_flags;
-
-        if (tracing_disabled || tracing_selftest_running)
-                return 0;
-
-        pc = preempt_count();
-        preempt_disable_notrace();
-        cpu = raw_smp_processor_id();
-        data = tr->data[cpu];
-
-        if (unlikely(atomic_read(&data->disabled)))
-                goto out;
-
-        pause_graph_tracing();
-        spin_lock_irqsave(&trace_buf_lock, irq_flags);
-        len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
-
-        len = min(len, TRACE_BUF_SIZE-1);
-        trace_buf[len] = 0;
-
-        size = sizeof(*entry) + len + 1;
-        event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags);
-        if (!event)
-                goto out_unlock;
-        entry = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, irq_flags, pc);
-        entry->ent.type                 = TRACE_PRINT;
-        entry->ip                       = ip;
-        entry->depth                    = depth;
-
-        memcpy(&entry->buf, trace_buf, len);
-        entry->buf[len] = 0;
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
-
- out_unlock:
-        spin_unlock_irqrestore(&trace_buf_lock, irq_flags);
-        unpause_graph_tracing();
- out:
-        preempt_enable_notrace();
-
-        return len;
-}
-EXPORT_SYMBOL_GPL(trace_vprintk);
 
-int __ftrace_printk(unsigned long ip, const char *fmt, ...)
-{
-        int ret;
-        va_list ap;
-
-        if (!(trace_flags & TRACE_ITER_PRINTK))
-                return 0;
+        for_each_tracing_cpu(cpu)
+                tracing_init_debugfs_percpu(cpu);
 
-        va_start(ap, fmt);
-        ret = trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap);
-        va_end(ap);
-        return ret;
+        return 0;
 }
-EXPORT_SYMBOL_GPL(__ftrace_printk);
 
 static int trace_panic_handler(struct notifier_block *this,
                                unsigned long event, void *unused)
@@ -3750,14 +4052,15 @@ trace_printk_seq(struct trace_seq *s)
 
         printk(KERN_TRACE "%s", s->buffer);
 
-        trace_seq_reset(s);
+        trace_seq_init(s);
 }
 
-void ftrace_dump(void)
+static void __ftrace_dump(bool disable_tracing)
 {
         static DEFINE_SPINLOCK(ftrace_dump_lock);
         /* use static because iter can be a bit big for the stack */
         static struct trace_iterator iter;
+        unsigned int old_userobj;
         static int dump_ran;
         unsigned long flags;
         int cnt = 0, cpu;
@@ -3769,21 +4072,26 @@ void ftrace_dump(void)
 
         dump_ran = 1;
 
-        /* No turning back! */
         tracing_off();
-        ftrace_kill();
+
+        if (disable_tracing)
+                ftrace_kill();
 
         for_each_tracing_cpu(cpu) {
                 atomic_inc(&global_trace.data[cpu]->disabled);
         }
 
+        old_userobj = trace_flags & TRACE_ITER_SYM_USEROBJ;
+
         /* don't look at user memory in panic mode */
         trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
 
         printk(KERN_TRACE "Dumping ftrace buffer:\n");
 
+        /* Simulate the iterator */
         iter.tr = &global_trace;
         iter.trace = current_trace;
+        iter.cpu_file = TRACE_PIPE_ALL_CPU;
 
         /*
          * We need to stop all tracing on all CPUS to read the
@@ -3819,13 +4127,30 @@ void ftrace_dump(void)
         else
                 printk(KERN_TRACE "---------------------------------\n");
 
+        /* Re-enable tracing if requested */
+        if (!disable_tracing) {
+                trace_flags |= old_userobj;
+
+                for_each_tracing_cpu(cpu) {
+                        atomic_dec(&global_trace.data[cpu]->disabled);
+                }
+                tracing_on();
+        }
+
  out:
         spin_unlock_irqrestore(&ftrace_dump_lock, flags);
 }
 
+/* By default: disable tracing after the dump */
+void ftrace_dump(void)
+{
+        __ftrace_dump(true);
+}
+
 __init static int tracer_alloc_buffers(void)
 {
         struct trace_array_cpu *data;
+        int ring_buf_size;
         int i;
         int ret = -ENOMEM;
 
@@ -3835,11 +4160,21 @@ __init static int tracer_alloc_buffers(void)
         if (!alloc_cpumask_var(&tracing_cpumask, GFP_KERNEL))
                 goto out_free_buffer_mask;
 
+        if (!alloc_cpumask_var(&tracing_reader_cpumask, GFP_KERNEL))
+                goto out_free_tracing_cpumask;
+
+        /* To save memory, keep the ring buffer size to its minimum */
+        if (ring_buffer_expanded)
+                ring_buf_size = trace_buf_size;
+        else
+                ring_buf_size = 1;
+
         cpumask_copy(tracing_buffer_mask, cpu_possible_mask);
         cpumask_copy(tracing_cpumask, cpu_all_mask);
+        cpumask_clear(tracing_reader_cpumask);
 
         /* TODO: make the number of buffers hot pluggable with CPUS */
-        global_trace.buffer = ring_buffer_alloc(trace_buf_size,
+        global_trace.buffer = ring_buffer_alloc(ring_buf_size,
                                                    TRACE_BUFFER_FLAGS);
         if (!global_trace.buffer) {
                 printk(KERN_ERR "tracer: failed to allocate ring buffer!\n");
@@ -3850,7 +4185,7 @@ __init static int tracer_alloc_buffers(void)
 
 
 #ifdef CONFIG_TRACER_MAX_TRACE
-        max_tr.buffer = ring_buffer_alloc(trace_buf_size,
+        max_tr.buffer = ring_buffer_alloc(ring_buf_size,
                                              TRACE_BUFFER_FLAGS);
         if (!max_tr.buffer) {
                 printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n");
@@ -3871,14 +4206,10 @@ __init static int tracer_alloc_buffers(void)
         trace_init_cmdlines();
 
         register_tracer(&nop_trace);
+        current_trace = &nop_trace;
 #ifdef CONFIG_BOOT_TRACER
         register_tracer(&boot_tracer);
-        current_trace = &boot_tracer;
-        current_trace->init(&global_trace);
-#else
-        current_trace = &nop_trace;
 #endif
-
         /* All seems OK, enable tracing */
         tracing_disabled = 0;
 
@@ -3886,14 +4217,38 @@ __init static int tracer_alloc_buffers(void)
                                        &trace_panic_notifier);
 
         register_die_notifier(&trace_die_notifier);
-        ret = 0;
+
+        return 0;
 
 out_free_cpumask:
+        free_cpumask_var(tracing_reader_cpumask);
+out_free_tracing_cpumask:
         free_cpumask_var(tracing_cpumask);
 out_free_buffer_mask:
         free_cpumask_var(tracing_buffer_mask);
 out:
         return ret;
 }
+
+__init static int clear_boot_tracer(void)
+{
+        /*
+         * The default tracer at boot buffer is an init section.
+         * This function is called in lateinit. If we did not
+         * find the boot tracer, then clear it out, to prevent
+         * later registration from accessing the buffer that is
+         * about to be freed.
+         */
+        if (!default_bootup_tracer)
+                return 0;
+
+        printk(KERN_INFO "ftrace bootup tracer '%s' not registered.\n",
+               default_bootup_tracer);
+        default_bootup_tracer = NULL;
+
+        return 0;
+}
+
 early_initcall(tracer_alloc_buffers);
 fs_initcall(tracer_init_debugfs);
+late_initcall(clear_boot_tracer);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 4d3d381bfd95..e685ac2b2ba1 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -9,6 +9,8 @@
 #include <linux/mmiotrace.h>
 #include <linux/ftrace.h>
 #include <trace/boot.h>
+#include <trace/kmemtrace.h>
+#include <trace/power.h>
 
 enum trace_type {
         __TRACE_FIRST_TYPE = 0,
@@ -16,9 +18,9 @@ enum trace_type {
         TRACE_FN,
         TRACE_CTX,
         TRACE_WAKE,
-        TRACE_CONT,
         TRACE_STACK,
         TRACE_PRINT,
+        TRACE_BPRINT,
         TRACE_SPECIAL,
         TRACE_MMIO_RW,
         TRACE_MMIO_MAP,
@@ -29,9 +31,14 @@ enum trace_type {
         TRACE_GRAPH_ENT,
         TRACE_USER_STACK,
         TRACE_HW_BRANCHES,
+        TRACE_SYSCALL_ENTER,
+        TRACE_SYSCALL_EXIT,
+        TRACE_KMEM_ALLOC,
+        TRACE_KMEM_FREE,
         TRACE_POWER,
+        TRACE_BLK,
 
-        __TRACE_LAST_TYPE
+        __TRACE_LAST_TYPE,
 };
 
 /*
@@ -42,7 +49,6 @@ enum trace_type {
  */
 struct trace_entry {
         unsigned char           type;
-        unsigned char           cpu;
         unsigned char           flags;
         unsigned char           preempt_count;
         int                     pid;
@@ -60,13 +66,13 @@ struct ftrace_entry {
 
 /* Function call entry */
 struct ftrace_graph_ent_entry {
-        struct trace_entry                      ent;
+        struct trace_entry              ent;
         struct ftrace_graph_ent         graph_ent;
 };
 
 /* Function return entry */
 struct ftrace_graph_ret_entry {
-        struct trace_entry                      ent;
+        struct trace_entry              ent;
         struct ftrace_graph_ret         ret;
 };
 extern struct tracer boot_tracer;
@@ -112,12 +118,18 @@ struct userstack_entry {
 };
 
 /*
- * ftrace_printk entry:
+ * trace_printk entry:
  */
+struct bprint_entry {
+        struct trace_entry      ent;
+        unsigned long           ip;
+        const char              *fmt;
+        u32                     buf[];
+};
+
 struct print_entry {
         struct trace_entry      ent;
         unsigned long           ip;
-        int                     depth;
         char                    buf[];
 };
 
@@ -170,15 +182,51 @@ struct trace_power {
         struct power_trace      state_data;
 };
 
+enum kmemtrace_type_id {
+        KMEMTRACE_TYPE_KMALLOC = 0,     /* kmalloc() or kfree(). */
+        KMEMTRACE_TYPE_CACHE,           /* kmem_cache_*(). */
+        KMEMTRACE_TYPE_PAGES,           /* __get_free_pages() and friends. */
+};
+
+struct kmemtrace_alloc_entry {
+        struct trace_entry      ent;
+        enum kmemtrace_type_id type_id;
+        unsigned long call_site;
+        const void *ptr;
+        size_t bytes_req;
+        size_t bytes_alloc;
+        gfp_t gfp_flags;
+        int node;
+};
+
+struct kmemtrace_free_entry {
+        struct trace_entry      ent;
+        enum kmemtrace_type_id type_id;
+        unsigned long call_site;
+        const void *ptr;
+};
+
+struct syscall_trace_enter {
+        struct trace_entry      ent;
+        int                     nr;
+        unsigned long           args[];
+};
+
+struct syscall_trace_exit {
+        struct trace_entry      ent;
+        int                     nr;
+        unsigned long           ret;
+};
+
+
 /*
  * trace_flag_type is an enumeration that holds different
  * states when a trace occurs. These are:
  *  IRQS_OFF            - interrupts were disabled
- *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
+ *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
  *  NEED_RESCED         - reschedule is requested
  *  HARDIRQ             - inside an interrupt handler
  *  SOFTIRQ             - inside a softirq handler
- *  CONT                - multiple entries hold the trace item
  */
 enum trace_flag_type {
         TRACE_FLAG_IRQS_OFF             = 0x01,
@@ -186,7 +234,6 @@ enum trace_flag_type {
         TRACE_FLAG_NEED_RESCHED         = 0x04,
         TRACE_FLAG_HARDIRQ              = 0x08,
         TRACE_FLAG_SOFTIRQ              = 0x10,
-        TRACE_FLAG_CONT                 = 0x20,
 };
 
 #define TRACE_BUF_SIZE          1024
@@ -198,6 +245,7 @@ enum trace_flag_type {
  */
 struct trace_array_cpu {
         atomic_t                disabled;
+        void                    *buffer_page;   /* ring buffer spare */
 
         /* these fields get copied into max-trace: */
         unsigned long           trace_idx;
@@ -262,10 +310,10 @@ extern void __ftrace_bad_type(void);
         do {                                                            \
                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
-                IF_ASSIGN(var, ent, struct trace_field_cont, TRACE_CONT); \
                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
+                IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
                 IF_ASSIGN(var, ent, struct special_entry, 0);           \
                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
                           TRACE_MMIO_RW);                               \
@@ -279,7 +327,15 @@ extern void __ftrace_bad_type(void);
                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
                           TRACE_GRAPH_RET);             \
                 IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
-                IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
+                IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
+                IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry,       \
+                          TRACE_KMEM_ALLOC);    \
+                IF_ASSIGN(var, ent, struct kmemtrace_free_entry,        \
+                          TRACE_KMEM_FREE);     \
+                IF_ASSIGN(var, ent, struct syscall_trace_enter,         \
+                          TRACE_SYSCALL_ENTER);                         \
+                IF_ASSIGN(var, ent, struct syscall_trace_exit,          \
+                          TRACE_SYSCALL_EXIT);                          \
                 __ftrace_bad_type();                                    \
         } while (0)
 
@@ -287,7 +343,8 @@ extern void __ftrace_bad_type(void);
 enum print_line_t {
         TRACE_TYPE_PARTIAL_LINE = 0,    /* Retry after flushing the seq */
         TRACE_TYPE_HANDLED      = 1,
-        TRACE_TYPE_UNHANDLED    = 2     /* Relay to other output functions */
+        TRACE_TYPE_UNHANDLED    = 2,    /* Relay to other output functions */
+        TRACE_TYPE_NO_CONSUME   = 3     /* Handled but ask to not consume */
 };
 
 
@@ -297,8 +354,8 @@ enum print_line_t {
  * flags value in struct tracer_flags.
  */
 struct tracer_opt {
-        const char      *name; /* Will appear on the trace_options file */
-        u32             bit; /* Mask assigned in val field in tracer_flags */
+        const char      *name; /* Will appear on the trace_options file */
+        u32             bit; /* Mask assigned in val field in tracer_flags */
 };
 
 /*
@@ -307,28 +364,51 @@ struct tracer_opt {
  */
 struct tracer_flags {
         u32                     val;
-        struct tracer_opt       *opts;
+        struct tracer_opt       *opts;
 };
 
 /* Makes more easy to define a tracer opt */
 #define TRACER_OPT(s, b)        .name = #s, .bit = b
 
-/*
- * A specific tracer, represented by methods that operate on a trace array:
+
+/**
+ * struct tracer - a specific tracer and its callbacks to interact with debugfs
+ * @name: the name chosen to select it on the available_tracers file
+ * @init: called when one switches to this tracer (echo name > current_tracer)
+ * @reset: called when one switches to another tracer
+ * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
+ * @stop: called when tracing is paused (echo 0 > tracing_enabled)
+ * @open: called when the trace file is opened
+ * @pipe_open: called when the trace_pipe file is opened
+ * @wait_pipe: override how the user waits for traces on trace_pipe
+ * @close: called when the trace file is released
+ * @read: override the default read callback on trace_pipe
+ * @splice_read: override the default splice_read callback on trace_pipe
+ * @selftest: selftest to run on boot (see trace_selftest.c)
+ * @print_headers: override the first lines that describe your columns
+ * @print_line: callback that prints a trace
+ * @set_flag: signals one of your private flags changed (trace_options file)
+ * @flags: your private flags
  */
 struct tracer {
         const char              *name;
-        /* Your tracer should raise a warning if init fails */
         int                     (*init)(struct trace_array *tr);
         void                    (*reset)(struct trace_array *tr);
         void                    (*start)(struct trace_array *tr);
         void                    (*stop)(struct trace_array *tr);
         void                    (*open)(struct trace_iterator *iter);
         void                    (*pipe_open)(struct trace_iterator *iter);
+        void                    (*wait_pipe)(struct trace_iterator *iter);
         void                    (*close)(struct trace_iterator *iter);
         ssize_t                 (*read)(struct trace_iterator *iter,
                                         struct file *filp, char __user *ubuf,
                                         size_t cnt, loff_t *ppos);
+        ssize_t                 (*splice_read)(struct trace_iterator *iter,
+                                               struct file *filp,
+                                               loff_t *ppos,
+                                               struct pipe_inode_info *pipe,
+                                               size_t len,
+                                               unsigned int flags);
 #ifdef CONFIG_FTRACE_STARTUP_TEST
         int                     (*selftest)(struct tracer *trace,
                                             struct trace_array *tr);
@@ -339,7 +419,8 @@ struct tracer {
         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
         struct tracer           *next;
         int                     print_max;
-        struct tracer_flags     *flags;
+        struct tracer_flags     *flags;
+        struct tracer_stat      *stats;
 };
 
 struct trace_seq {
@@ -348,6 +429,16 @@ struct trace_seq {
         unsigned int            readpos;
 };
 
+static inline void
+trace_seq_init(struct trace_seq *s)
+{
+        s->len = 0;
+        s->readpos = 0;
+}
+
+
+#define TRACE_PIPE_ALL_CPU      -1
+
 /*
  * Trace iterator - used by printout routines who present trace
  * results to users and which routines might sleep, etc:
@@ -356,6 +447,8 @@ struct trace_iterator {
         struct trace_array      *tr;
         struct tracer           *trace;
         void                    *private;
+        int                     cpu_file;
+        struct mutex            mutex;
         struct ring_buffer_iter *buffer_iter[NR_CPUS];
 
         /* The below is zeroed out in pipe_read */
@@ -371,6 +464,7 @@ struct trace_iterator {
         cpumask_var_t           started;
 };
 
+int tracer_init(struct tracer *t, struct trace_array *tr);
 int tracing_is_enabled(void);
 void trace_wake_up(void);
 void tracing_reset(struct trace_array *tr, int cpu);
@@ -379,26 +473,50 @@ int tracing_open_generic(struct inode *inode, struct file *filp);
 struct dentry *tracing_init_dentry(void);
 void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
 
+struct ring_buffer_event;
+
+struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr,
+                                                    unsigned char type,
+                                                    unsigned long len,
+                                                    unsigned long flags,
+                                                    int pc);
+void trace_buffer_unlock_commit(struct trace_array *tr,
+                                struct ring_buffer_event *event,
+                                unsigned long flags, int pc);
+
+struct ring_buffer_event *
+trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,
+                                  unsigned long flags, int pc);
+void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
+                                        unsigned long flags, int pc);
+void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,
+                                        unsigned long flags, int pc);
+
 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
                                                 struct trace_array_cpu *data);
+
+struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
+                                          int *ent_cpu, u64 *ent_ts);
+
 void tracing_generic_entry_update(struct trace_entry *entry,
                                   unsigned long flags,
                                   int pc);
 
+void default_wait_pipe(struct trace_iterator *iter);
+void poll_wait_pipe(struct trace_iterator *iter);
+
 void ftrace(struct trace_array *tr,
                             struct trace_array_cpu *data,
                             unsigned long ip,
                             unsigned long parent_ip,
                             unsigned long flags, int pc);
 void tracing_sched_switch_trace(struct trace_array *tr,
-                                struct trace_array_cpu *data,
                                 struct task_struct *prev,
                                 struct task_struct *next,
                                 unsigned long flags, int pc);
 void tracing_record_cmdline(struct task_struct *tsk);
 
 void tracing_sched_wakeup_trace(struct trace_array *tr,
-                                struct trace_array_cpu *data,
                                 struct task_struct *wakee,
                                 struct task_struct *cur,
                                 unsigned long flags, int pc);
@@ -408,14 +526,12 @@ void trace_special(struct trace_array *tr,
                    unsigned long arg2,
                    unsigned long arg3, int pc);
 void trace_function(struct trace_array *tr,
-                    struct trace_array_cpu *data,
                     unsigned long ip,
                     unsigned long parent_ip,
                     unsigned long flags, int pc);
 
 void trace_graph_return(struct ftrace_graph_ret *trace);
 int trace_graph_entry(struct ftrace_graph_ent *trace);
-void trace_hw_branch(struct trace_array *tr, u64 from, u64 to);
 
 void tracing_start_cmdline_record(void);
 void tracing_stop_cmdline_record(void);
@@ -434,15 +550,11 @@ void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 void update_max_tr_single(struct trace_array *tr,
                           struct task_struct *tsk, int cpu);
 
-extern cycle_t ftrace_now(int cpu);
+void __trace_stack(struct trace_array *tr,
+                   unsigned long flags,
+                   int skip, int pc);
 
-#ifdef CONFIG_FUNCTION_TRACER
-void tracing_start_function_trace(void);
-void tracing_stop_function_trace(void);
-#else
-# define tracing_start_function_trace()         do { } while (0)
-# define tracing_stop_function_trace()          do { } while (0)
-#endif
+extern cycle_t ftrace_now(int cpu);
 
 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
 typedef void
@@ -456,10 +568,10 @@ struct tracer_switch_ops {
         void                            *private;
         struct tracer_switch_ops        *next;
 };
-
-char *trace_find_cmdline(int pid);
 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
 
+extern void trace_find_cmdline(int pid, char comm[]);
+
 #ifdef CONFIG_DYNAMIC_FTRACE
 extern unsigned long ftrace_update_tot_cnt;
 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
@@ -469,6 +581,8 @@ extern int DYN_FTRACE_TEST_NAME(void);
 #ifdef CONFIG_FTRACE_STARTUP_TEST
 extern int trace_selftest_startup_function(struct tracer *trace,
                                            struct trace_array *tr);
+extern int trace_selftest_startup_function_graph(struct tracer *trace,
+                                                 struct trace_array *tr);
 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
                                           struct trace_array *tr);
 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
@@ -488,18 +602,11 @@ extern int trace_selftest_startup_branch(struct tracer *trace,
 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 
 extern void *head_page(struct trace_array_cpu *data);
-extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
-extern void trace_seq_print_cont(struct trace_seq *s,
-                                 struct trace_iterator *iter);
-
+extern unsigned long long ns2usecs(cycle_t nsec);
 extern int
-seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
-                unsigned long sym_flags);
-extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
-                                 size_t cnt);
-extern long ns2usecs(cycle_t nsec);
+trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
 extern int
-trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args);
+trace_vprintk(unsigned long ip, const char *fmt, va_list args);
 
 extern unsigned long trace_flags;
 
@@ -580,7 +687,11 @@ enum trace_iterator_flags {
         TRACE_ITER_ANNOTATE             = 0x2000,
         TRACE_ITER_USERSTACKTRACE       = 0x4000,
         TRACE_ITER_SYM_USEROBJ          = 0x8000,
-        TRACE_ITER_PRINTK_MSGONLY       = 0x10000
+        TRACE_ITER_PRINTK_MSGONLY       = 0x10000,
+        TRACE_ITER_CONTEXT_INFO         = 0x20000, /* Print pid/cpu/time */
+        TRACE_ITER_LATENCY_FMT          = 0x40000,
+        TRACE_ITER_GLOBAL_CLK           = 0x80000,
+        TRACE_ITER_SLEEP_TIME           = 0x100000,
 };
 
 /*
@@ -601,12 +712,12 @@ extern struct tracer nop_trace;
  * preempt_enable (after a disable), a schedule might take place
  * causing an infinite recursion.
  *
- * To prevent this, we read the need_recshed flag before
+ * To prevent this, we read the need_resched flag before
  * disabling preemption. When we want to enable preemption we
  * check the flag, if it is set, then we call preempt_enable_no_resched.
  * Otherwise, we call preempt_enable.
  *
- * The rational for doing the above is that if need resched is set
+ * The rational for doing the above is that if need_resched is set
  * and we have yet to reschedule, we are either in an atomic location
  * (where we do not need to check for scheduling) or we are inside
  * the scheduler and do not want to resched.
@@ -627,7 +738,7 @@ static inline int ftrace_preempt_disable(void)
  *
  * This is a scheduler safe way to enable preemption and not miss
  * any preemption checks. The disabled saved the state of preemption.
- * If resched is set, then we were either inside an atomic or
+ * If resched is set, then we are either inside an atomic or
  * are inside the scheduler (we would have already scheduled
  * otherwise). In this case, we do not want to call normal
  * preempt_enable, but preempt_enable_no_resched instead.
@@ -664,4 +775,118 @@ static inline void trace_branch_disable(void)
 }
 #endif /* CONFIG_BRANCH_TRACER */
 
+/* set ring buffers to default size if not already done so */
+int tracing_update_buffers(void);
+
+/* trace event type bit fields, not numeric */
+enum {
+        TRACE_EVENT_TYPE_PRINTF         = 1,
+        TRACE_EVENT_TYPE_RAW            = 2,
+};
+
+struct ftrace_event_field {
+        struct list_head        link;
+        char                    *name;
+        char                    *type;
+        int                     offset;
+        int                     size;
+};
+
+struct ftrace_event_call {
+        char                    *name;
+        char                    *system;
+        struct dentry           *dir;
+        int                     enabled;
+        int                     (*regfunc)(void);
+        void                    (*unregfunc)(void);
+        int                     id;
+        int                     (*raw_init)(void);
+        int                     (*show_format)(struct trace_seq *s);
+        int                     (*define_fields)(void);
+        struct list_head        fields;
+        struct filter_pred      **preds;
+
+#ifdef CONFIG_EVENT_PROFILE
+        atomic_t        profile_count;
+        int             (*profile_enable)(struct ftrace_event_call *);
+        void            (*profile_disable)(struct ftrace_event_call *);
+#endif
+};
+
+struct event_subsystem {
+        struct list_head        list;
+        const char              *name;
+        struct dentry           *entry;
+        struct filter_pred      **preds;
+};
+
+#define events_for_each(event)                                          \
+        for (event = __start_ftrace_events;                             \
+             (unsigned long)event < (unsigned long)__stop_ftrace_events; \
+             event++)
+
+#define MAX_FILTER_PRED 8
+
+struct filter_pred;
+
+typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
+
+struct filter_pred {
+        filter_pred_fn_t fn;
+        u64 val;
+        char *str_val;
+        int str_len;
+        char *field_name;
+        int offset;
+        int not;
+        int or;
+        int compound;
+        int clear;
+};
+
+int trace_define_field(struct ftrace_event_call *call, char *type,
+                       char *name, int offset, int size);
+extern void filter_free_pred(struct filter_pred *pred);
+extern void filter_print_preds(struct filter_pred **preds,
+                               struct trace_seq *s);
+extern int filter_parse(char **pbuf, struct filter_pred *pred);
+extern int filter_add_pred(struct ftrace_event_call *call,
+                           struct filter_pred *pred);
+extern void filter_free_preds(struct ftrace_event_call *call);
+extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
+extern void filter_free_subsystem_preds(struct event_subsystem *system);
+extern int filter_add_subsystem_pred(struct event_subsystem *system,
+                                     struct filter_pred *pred);
+
+void event_trace_printk(unsigned long ip, const char *fmt, ...);
+extern struct ftrace_event_call __start_ftrace_events[];
+extern struct ftrace_event_call __stop_ftrace_events[];
+
+#define for_each_event(event)                                           \
+        for (event = __start_ftrace_events;                             \
+             (unsigned long)event < (unsigned long)__stop_ftrace_events; \
+             event++)
+
+extern const char *__start___trace_bprintk_fmt[];
+extern const char *__stop___trace_bprintk_fmt[];
+
+/*
+ * The double __builtin_constant_p is because gcc will give us an error
+ * if we try to allocate the static variable to fmt if it is not a
+ * constant. Even with the outer if statement optimizing out.
+ */
+#define event_trace_printk(ip, fmt, args...)                            \
+do {                                                                    \
+        __trace_printk_check_format(fmt, ##args);                       \
+        tracing_record_cmdline(current);                                \
+        if (__builtin_constant_p(fmt)) {                                \
+                static const char *trace_printk_fmt                     \
+                  __attribute__((section("__trace_printk_fmt"))) =      \
+                        __builtin_constant_p(fmt) ? fmt : NULL;         \
+                                                                        \
+                __trace_bprintk(ip, trace_printk_fmt, ##args);          \
+        } else                                                          \
+                __trace_printk(ip, fmt, ##args);                        \
+} while (0)
+
 #endif /* _LINUX_KERNEL_TRACE_H */
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index 366c8c333e13..7a30fc4c3642 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -11,6 +11,7 @@
 #include <linux/kallsyms.h>
 
 #include "trace.h"
+#include "trace_output.h"
 
 static struct trace_array *boot_trace;
 static bool pre_initcalls_finished;
@@ -27,13 +28,13 @@ void start_boot_trace(void)
 
 void enable_boot_trace(void)
 {
-        if (pre_initcalls_finished)
+        if (boot_trace && pre_initcalls_finished)
                 tracing_start_sched_switch_record();
 }
 
 void disable_boot_trace(void)
 {
-        if (pre_initcalls_finished)
+        if (boot_trace && pre_initcalls_finished)
                 tracing_stop_sched_switch_record();
 }
 
@@ -42,6 +43,9 @@ static int boot_trace_init(struct trace_array *tr)
         int cpu;
         boot_trace = tr;
 
+        if (!tr)
+                return 0;
+
         for_each_cpu(cpu, cpu_possible_mask)
                 tracing_reset(tr, cpu);
 
@@ -128,10 +132,9 @@ void trace_boot_call(struct boot_trace_call *bt, initcall_t fn)
 {
         struct ring_buffer_event *event;
         struct trace_boot_call *entry;
-        unsigned long irq_flags;
         struct trace_array *tr = boot_trace;
 
-        if (!pre_initcalls_finished)
+        if (!tr || !pre_initcalls_finished)
                 return;
 
         /* Get its name now since this function could
@@ -140,18 +143,13 @@ void trace_boot_call(struct boot_trace_call *bt, initcall_t fn)
         sprint_symbol(bt->func, (unsigned long)fn);
         preempt_disable();
 
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-                                         &irq_flags);
+        event = trace_buffer_lock_reserve(tr, TRACE_BOOT_CALL,
+                                          sizeof(*entry), 0, 0);
         if (!event)
                 goto out;
         entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, 0, 0);
-        entry->ent.type = TRACE_BOOT_CALL;
         entry->boot_call = *bt;
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
-
-        trace_wake_up();
-
+        trace_buffer_unlock_commit(tr, event, 0, 0);
  out:
         preempt_enable();
 }
@@ -160,27 +158,21 @@ void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn)
 {
         struct ring_buffer_event *event;
         struct trace_boot_ret *entry;
-        unsigned long irq_flags;
         struct trace_array *tr = boot_trace;
 
-        if (!pre_initcalls_finished)
+        if (!tr || !pre_initcalls_finished)
                 return;
 
         sprint_symbol(bt->func, (unsigned long)fn);
         preempt_disable();
 
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-                                         &irq_flags);
+        event = trace_buffer_lock_reserve(tr, TRACE_BOOT_RET,
+                                          sizeof(*entry), 0, 0);
         if (!event)
                 goto out;
         entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, 0, 0);
-        entry->ent.type = TRACE_BOOT_RET;
         entry->boot_ret = *bt;
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
-
-        trace_wake_up();
-
+        trace_buffer_unlock_commit(tr, event, 0, 0);
  out:
         preempt_enable();
 }
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
index 6c00feb3bac7..ad8c22efff41 100644
--- a/kernel/trace/trace_branch.c
+++ b/kernel/trace/trace_branch.c
@@ -14,12 +14,17 @@
 #include <linux/hash.h>
 #include <linux/fs.h>
 #include <asm/local.h>
+
 #include "trace.h"
+#include "trace_stat.h"
+#include "trace_output.h"
 
 #ifdef CONFIG_BRANCH_TRACER
 
+static struct tracer branch_trace;
 static int branch_tracing_enabled __read_mostly;
 static DEFINE_MUTEX(branch_tracing_mutex);
+
 static struct trace_array *branch_tracer;
 
 static void
@@ -28,7 +33,7 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
         struct trace_array *tr = branch_tracer;
         struct ring_buffer_event *event;
         struct trace_branch *entry;
-        unsigned long flags, irq_flags;
+        unsigned long flags;
         int cpu, pc;
         const char *p;
 
@@ -47,15 +52,13 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
         if (atomic_inc_return(&tr->data[cpu]->disabled) != 1)
                 goto out;
 
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-                                         &irq_flags);
+        pc = preempt_count();
+        event = trace_buffer_lock_reserve(tr, TRACE_BRANCH,
+                                          sizeof(*entry), flags, pc);
         if (!event)
                 goto out;
 
-        pc = preempt_count();
         entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, flags, pc);
-        entry->ent.type         = TRACE_BRANCH;
 
         /* Strip off the path, only save the file */
         p = f->file + strlen(f->file);
@@ -70,7 +73,7 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
         entry->line = f->line;
         entry->correct = val == expect;
 
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+        ring_buffer_unlock_commit(tr->buffer, event);
 
  out:
         atomic_dec(&tr->data[cpu]->disabled);
@@ -88,8 +91,6 @@ void trace_likely_condition(struct ftrace_branch_data *f, int val, int expect)
 
 int enable_branch_tracing(struct trace_array *tr)
 {
-        int ret = 0;
-
         mutex_lock(&branch_tracing_mutex);
         branch_tracer = tr;
         /*
@@ -100,7 +101,7 @@ int enable_branch_tracing(struct trace_array *tr)
         branch_tracing_enabled++;
         mutex_unlock(&branch_tracing_mutex);
 
-        return ret;
+        return 0;
 }
 
 void disable_branch_tracing(void)
@@ -128,11 +129,6 @@ static void stop_branch_trace(struct trace_array *tr)
 
 static int branch_trace_init(struct trace_array *tr)
 {
-        int cpu;
-
-        for_each_online_cpu(cpu)
-                tracing_reset(tr, cpu);
-
         start_branch_trace(tr);
         return 0;
 }
@@ -142,22 +138,53 @@ static void branch_trace_reset(struct trace_array *tr)
         stop_branch_trace(tr);
 }
 
-struct tracer branch_trace __read_mostly =
+static enum print_line_t trace_branch_print(struct trace_iterator *iter,
+                                            int flags)
+{
+        struct trace_branch *field;
+
+        trace_assign_type(field, iter->ent);
+
+        if (trace_seq_printf(&iter->seq, "[%s] %s:%s:%d\n",
+                             field->correct ? "  ok  " : " MISS ",
+                             field->func,
+                             field->file,
+                             field->line))
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+
+static struct trace_event trace_branch_event = {
+        .type           = TRACE_BRANCH,
+        .trace          = trace_branch_print,
+};
+
+static struct tracer branch_trace __read_mostly =
 {
         .name           = "branch",
         .init           = branch_trace_init,
         .reset          = branch_trace_reset,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest       = trace_selftest_startup_branch,
-#endif
+#endif /* CONFIG_FTRACE_SELFTEST */
 };
 
-__init static int init_branch_trace(void)
+__init static int init_branch_tracer(void)
 {
+        int ret;
+
+        ret = register_ftrace_event(&trace_branch_event);
+        if (!ret) {
+                printk(KERN_WARNING "Warning: could not register "
+                                    "branch events\n");
+                return 1;
+        }
         return register_tracer(&branch_trace);
 }
+device_initcall(init_branch_tracer);
 
-device_initcall(init_branch_trace);
 #else
 static inline
 void trace_likely_condition(struct ftrace_branch_data *f, int val, int expect)
@@ -183,66 +210,39 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect)
 }
 EXPORT_SYMBOL(ftrace_likely_update);
 
-struct ftrace_pointer {
-        void            *start;
-        void            *stop;
-        int             hit;
-};
+extern unsigned long __start_annotated_branch_profile[];
+extern unsigned long __stop_annotated_branch_profile[];
 
-static void *
-t_next(struct seq_file *m, void *v, loff_t *pos)
+static int annotated_branch_stat_headers(struct seq_file *m)
 {
-        const struct ftrace_pointer *f = m->private;
-        struct ftrace_branch_data *p = v;
-
-        (*pos)++;
-
-        if (v == (void *)1)
-                return f->start;
-
-        ++p;
-
-        if ((void *)p >= (void *)f->stop)
-                return NULL;
-
-        return p;
+        seq_printf(m, " correct incorrect  %% ");
+        seq_printf(m, "       Function                "
+                              "  File              Line\n"
+                              " ------- ---------  - "
+                              "       --------                "
+                              "  ----              ----\n");
+        return 0;
 }
 
-static void *t_start(struct seq_file *m, loff_t *pos)
+static inline long get_incorrect_percent(struct ftrace_branch_data *p)
 {
-        void *t = (void *)1;
-        loff_t l = 0;
-
-        for (; t && l < *pos; t = t_next(m, t, &l))
-                ;
+        long percent;
 
-        return t;
-}
+        if (p->correct) {
+                percent = p->incorrect * 100;
+                percent /= p->correct + p->incorrect;
+        } else
+                percent = p->incorrect ? 100 : -1;
 
-static void t_stop(struct seq_file *m, void *p)
-{
+        return percent;
 }
 
-static int t_show(struct seq_file *m, void *v)
+static int branch_stat_show(struct seq_file *m, void *v)
 {
-        const struct ftrace_pointer *fp = m->private;
         struct ftrace_branch_data *p = v;
         const char *f;
         long percent;
 
-        if (v == (void *)1) {
-                if (fp->hit)
-                        seq_printf(m, "   miss      hit    %% ");
-                else
-                        seq_printf(m, " correct incorrect  %% ");
-                seq_printf(m, "       Function                "
-                              "  File              Line\n"
-                              " ------- ---------  - "
-                              "       --------                "
-                              "  ----              ----\n");
-                return 0;
-        }
-
         /* Only print the file, not the path */
         f = p->file + strlen(p->file);
         while (f >= p->file && *f != '/')
@@ -252,11 +252,7 @@ static int t_show(struct seq_file *m, void *v)
         /*
          * The miss is overlayed on correct, and hit on incorrect.
          */
-        if (p->correct) {
-                percent = p->incorrect * 100;
-                percent /= p->correct + p->incorrect;
-        } else
-                percent = p->incorrect ? 100 : -1;
+        percent = get_incorrect_percent(p);
 
         seq_printf(m, "%8lu %8lu ",  p->correct, p->incorrect);
         if (percent < 0)
@@ -267,76 +263,118 @@ static int t_show(struct seq_file *m, void *v)
         return 0;
 }
 
-static struct seq_operations tracing_likely_seq_ops = {
-        .start          = t_start,
-        .next           = t_next,
-        .stop           = t_stop,
-        .show           = t_show,
+static void *annotated_branch_stat_start(void)
+{
+        return __start_annotated_branch_profile;
+}
+
+static void *
+annotated_branch_stat_next(void *v, int idx)
+{
+        struct ftrace_branch_data *p = v;
+
+        ++p;
+
+        if ((void *)p >= (void *)__stop_annotated_branch_profile)
+                return NULL;
+
+        return p;
+}
+
+static int annotated_branch_stat_cmp(void *p1, void *p2)
+{
+        struct ftrace_branch_data *a = p1;
+        struct ftrace_branch_data *b = p2;
+
+        long percent_a, percent_b;
+
+        percent_a = get_incorrect_percent(a);
+        percent_b = get_incorrect_percent(b);
+
+        if (percent_a < percent_b)
+                return -1;
+        if (percent_a > percent_b)
+                return 1;
+        else
+                return 0;
+}
+
+static struct tracer_stat annotated_branch_stats = {
+        .name = "branch_annotated",
+        .stat_start = annotated_branch_stat_start,
+        .stat_next = annotated_branch_stat_next,
+        .stat_cmp = annotated_branch_stat_cmp,
+        .stat_headers = annotated_branch_stat_headers,
+        .stat_show = branch_stat_show
 };
 
-static int tracing_branch_open(struct inode *inode, struct file *file)
+__init static int init_annotated_branch_stats(void)
 {
         int ret;
 
-        ret = seq_open(file, &tracing_likely_seq_ops);
+        ret = register_stat_tracer(&annotated_branch_stats);
         if (!ret) {
-                struct seq_file *m = file->private_data;
-                m->private = (void *)inode->i_private;
+                printk(KERN_WARNING "Warning: could not register "
+                                    "annotated branches stats\n");
+                return 1;
         }
-
-        return ret;
+        return 0;
 }
-
-static const struct file_operations tracing_branch_fops = {
-        .open           = tracing_branch_open,
-        .read           = seq_read,
-        .llseek         = seq_lseek,
-};
+fs_initcall(init_annotated_branch_stats);
 
 #ifdef CONFIG_PROFILE_ALL_BRANCHES
+
 extern unsigned long __start_branch_profile[];
 extern unsigned long __stop_branch_profile[];
 
-static const struct ftrace_pointer ftrace_branch_pos = {
-        .start                  = __start_branch_profile,
-        .stop                   = __stop_branch_profile,
-        .hit                    = 1,
-};
+static int all_branch_stat_headers(struct seq_file *m)
+{
+        seq_printf(m, "   miss      hit    %% ");
+        seq_printf(m, "       Function                "
+                              "  File              Line\n"
+                              " ------- ---------  - "
+                              "       --------                "
+                              "  ----              ----\n");
+        return 0;
+}
 
-#endif /* CONFIG_PROFILE_ALL_BRANCHES */
+static void *all_branch_stat_start(void)
+{
+        return __start_branch_profile;
+}
 
-extern unsigned long __start_annotated_branch_profile[];
-extern unsigned long __stop_annotated_branch_profile[];
+static void *
+all_branch_stat_next(void *v, int idx)
+{
+        struct ftrace_branch_data *p = v;
 
-static const struct ftrace_pointer ftrace_annotated_branch_pos = {
-        .start                  = __start_annotated_branch_profile,
-        .stop                   = __stop_annotated_branch_profile,
-};
+        ++p;
 
-static __init int ftrace_branch_init(void)
-{
-        struct dentry *d_tracer;
-        struct dentry *entry;
+        if ((void *)p >= (void *)__stop_branch_profile)
+                return NULL;
 
-        d_tracer = tracing_init_dentry();
+        return p;
+}
 
-        entry = debugfs_create_file("profile_annotated_branch", 0444, d_tracer,
-                                    (void *)&ftrace_annotated_branch_pos,
-                                    &tracing_branch_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'profile_annotatet_branch' entry\n");
+static struct tracer_stat all_branch_stats = {
+        .name = "branch_all",
+        .stat_start = all_branch_stat_start,
+        .stat_next = all_branch_stat_next,
+        .stat_headers = all_branch_stat_headers,
+        .stat_show = branch_stat_show
+};
 
-#ifdef CONFIG_PROFILE_ALL_BRANCHES
-        entry = debugfs_create_file("profile_branch", 0444, d_tracer,
-                                    (void *)&ftrace_branch_pos,
-                                    &tracing_branch_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs"
-                           " 'profile_branch' entry\n");
-#endif
+__init static int all_annotated_branch_stats(void)
+{
+        int ret;
 
+        ret = register_stat_tracer(&all_branch_stats);
+        if (!ret) {
+                printk(KERN_WARNING "Warning: could not register "
+                                    "all branches stats\n");
+                return 1;
+        }
         return 0;
 }
-
-device_initcall(ftrace_branch_init);
+fs_initcall(all_annotated_branch_stats);
+#endif /* CONFIG_PROFILE_ALL_BRANCHES */
diff --git a/kernel/trace/trace_clock.c b/kernel/trace/trace_clock.c
new file mode 100644
index 000000000000..b588fd81f7f9
--- /dev/null
+++ b/kernel/trace/trace_clock.c
@@ -0,0 +1,109 @@
+/*
+ * tracing clocks
+ *
+ *  Copyright (C) 2009 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ *
+ * Implements 3 trace clock variants, with differing scalability/precision
+ * tradeoffs:
+ *
+ *  -   local: CPU-local trace clock
+ *  -  medium: scalable global clock with some jitter
+ *  -  global: globally monotonic, serialized clock
+ *
+ * Tracer plugins will chose a default from these clocks.
+ */
+#include <linux/spinlock.h>
+#include <linux/hardirq.h>
+#include <linux/module.h>
+#include <linux/percpu.h>
+#include <linux/sched.h>
+#include <linux/ktime.h>
+#include <linux/trace_clock.h>
+
+/*
+ * trace_clock_local(): the simplest and least coherent tracing clock.
+ *
+ * Useful for tracing that does not cross to other CPUs nor
+ * does it go through idle events.
+ */
+u64 notrace trace_clock_local(void)
+{
+        unsigned long flags;
+        u64 clock;
+
+        /*
+         * sched_clock() is an architecture implemented, fast, scalable,
+         * lockless clock. It is not guaranteed to be coherent across
+         * CPUs, nor across CPU idle events.
+         */
+        raw_local_irq_save(flags);
+        clock = sched_clock();
+        raw_local_irq_restore(flags);
+
+        return clock;
+}
+
+/*
+ * trace_clock(): 'inbetween' trace clock. Not completely serialized,
+ * but not completely incorrect when crossing CPUs either.
+ *
+ * This is based on cpu_clock(), which will allow at most ~1 jiffy of
+ * jitter between CPUs. So it's a pretty scalable clock, but there
+ * can be offsets in the trace data.
+ */
+u64 notrace trace_clock(void)
+{
+        return cpu_clock(raw_smp_processor_id());
+}
+
+
+/*
+ * trace_clock_global(): special globally coherent trace clock
+ *
+ * It has higher overhead than the other trace clocks but is still
+ * an order of magnitude faster than GTOD derived hardware clocks.
+ *
+ * Used by plugins that need globally coherent timestamps.
+ */
+
+static u64 prev_trace_clock_time;
+
+static raw_spinlock_t trace_clock_lock ____cacheline_aligned_in_smp =
+        (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
+
+u64 notrace trace_clock_global(void)
+{
+        unsigned long flags;
+        int this_cpu;
+        u64 now;
+
+        raw_local_irq_save(flags);
+
+        this_cpu = raw_smp_processor_id();
+        now = cpu_clock(this_cpu);
+        /*
+         * If in an NMI context then dont risk lockups and return the
+         * cpu_clock() time:
+         */
+        if (unlikely(in_nmi()))
+                goto out;
+
+        __raw_spin_lock(&trace_clock_lock);
+
+        /*
+         * TODO: if this happens often then maybe we should reset
+         * my_scd->clock to prev_trace_clock_time+1, to make sure
+         * we start ticking with the local clock from now on?
+         */
+        if ((s64)(now - prev_trace_clock_time) < 0)
+                now = prev_trace_clock_time + 1;
+
+        prev_trace_clock_time = now;
+
+        __raw_spin_unlock(&trace_clock_lock);
+
+ out:
+        raw_local_irq_restore(flags);
+
+        return now;
+}
diff --git a/kernel/trace/trace_event_profile.c b/kernel/trace/trace_event_profile.c
new file mode 100644
index 000000000000..22cba9970776
--- /dev/null
+++ b/kernel/trace/trace_event_profile.c
@@ -0,0 +1,31 @@
+/*
+ * trace event based perf counter profiling
+ *
+ * Copyright (C) 2009 Red Hat Inc, Peter Zijlstra <pzijlstr@redhat.com>
+ *
+ */
+
+#include "trace.h"
+
+int ftrace_profile_enable(int event_id)
+{
+        struct ftrace_event_call *event;
+
+        for_each_event(event) {
+                if (event->id == event_id)
+                        return event->profile_enable(event);
+        }
+
+        return -EINVAL;
+}
+
+void ftrace_profile_disable(int event_id)
+{
+        struct ftrace_event_call *event;
+
+        for_each_event(event) {
+                if (event->id == event_id)
+                        return event->profile_disable(event);
+        }
+}
+
diff --git a/kernel/trace/trace_event_types.h b/kernel/trace/trace_event_types.h
new file mode 100644
index 000000000000..fd78bee71dd7
--- /dev/null
+++ b/kernel/trace/trace_event_types.h
@@ -0,0 +1,173 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM    ftrace
+
+/*
+ * We cheat and use the proto type field as the ID
+ * and args as the entry type (minus 'struct')
+ */
+TRACE_EVENT_FORMAT(function, TRACE_FN, ftrace_entry, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(unsigned long, ip, ip)
+                TRACE_FIELD(unsigned long, parent_ip, parent_ip)
+        ),
+        TP_RAW_FMT(" %lx <-- %lx")
+);
+
+TRACE_EVENT_FORMAT(funcgraph_entry, TRACE_GRAPH_ENT,
+                   ftrace_graph_ent_entry, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(unsigned long, graph_ent.func, func)
+                TRACE_FIELD(int, graph_ent.depth, depth)
+        ),
+        TP_RAW_FMT("--> %lx (%d)")
+);
+
+TRACE_EVENT_FORMAT(funcgraph_exit, TRACE_GRAPH_RET,
+                   ftrace_graph_ret_entry, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(unsigned long, ret.func, func)
+                TRACE_FIELD(int, ret.depth, depth)
+        ),
+        TP_RAW_FMT("<-- %lx (%d)")
+);
+
+TRACE_EVENT_FORMAT(wakeup, TRACE_WAKE, ctx_switch_entry, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(unsigned int, prev_pid, prev_pid)
+                TRACE_FIELD(unsigned char, prev_prio, prev_prio)
+                TRACE_FIELD(unsigned char, prev_state, prev_state)
+                TRACE_FIELD(unsigned int, next_pid, next_pid)
+                TRACE_FIELD(unsigned char, next_prio, next_prio)
+                TRACE_FIELD(unsigned char, next_state, next_state)
+                TRACE_FIELD(unsigned int, next_cpu, next_cpu)
+        ),
+        TP_RAW_FMT("%u:%u:%u  ==+ %u:%u:%u [%03u]")
+);
+
+TRACE_EVENT_FORMAT(context_switch, TRACE_CTX, ctx_switch_entry, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(unsigned int, prev_pid, prev_pid)
+                TRACE_FIELD(unsigned char, prev_prio, prev_prio)
+                TRACE_FIELD(unsigned char, prev_state, prev_state)
+                TRACE_FIELD(unsigned int, next_pid, next_pid)
+                TRACE_FIELD(unsigned char, next_prio, next_prio)
+                TRACE_FIELD(unsigned char, next_state, next_state)
+                TRACE_FIELD(unsigned int, next_cpu, next_cpu)
+        ),
+        TP_RAW_FMT("%u:%u:%u  ==+ %u:%u:%u [%03u]")
+);
+
+TRACE_EVENT_FORMAT(special, TRACE_SPECIAL, special_entry, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(unsigned long, arg1, arg1)
+                TRACE_FIELD(unsigned long, arg2, arg2)
+                TRACE_FIELD(unsigned long, arg3, arg3)
+        ),
+        TP_RAW_FMT("(%08lx) (%08lx) (%08lx)")
+);
+
+/*
+ * Stack-trace entry:
+ */
+
+/* #define FTRACE_STACK_ENTRIES   8 */
+
+TRACE_EVENT_FORMAT(kernel_stack, TRACE_STACK, stack_entry, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(unsigned long, caller[0], stack0)
+                TRACE_FIELD(unsigned long, caller[1], stack1)
+                TRACE_FIELD(unsigned long, caller[2], stack2)
+                TRACE_FIELD(unsigned long, caller[3], stack3)
+                TRACE_FIELD(unsigned long, caller[4], stack4)
+                TRACE_FIELD(unsigned long, caller[5], stack5)
+                TRACE_FIELD(unsigned long, caller[6], stack6)
+                TRACE_FIELD(unsigned long, caller[7], stack7)
+        ),
+        TP_RAW_FMT("\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n"
+                 "\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n")
+);
+
+TRACE_EVENT_FORMAT(user_stack, TRACE_USER_STACK, userstack_entry, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(unsigned long, caller[0], stack0)
+                TRACE_FIELD(unsigned long, caller[1], stack1)
+                TRACE_FIELD(unsigned long, caller[2], stack2)
+                TRACE_FIELD(unsigned long, caller[3], stack3)
+                TRACE_FIELD(unsigned long, caller[4], stack4)
+                TRACE_FIELD(unsigned long, caller[5], stack5)
+                TRACE_FIELD(unsigned long, caller[6], stack6)
+                TRACE_FIELD(unsigned long, caller[7], stack7)
+        ),
+        TP_RAW_FMT("\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n"
+                 "\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n")
+);
+
+TRACE_EVENT_FORMAT(bprint, TRACE_BPRINT, bprint_entry, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(unsigned long, ip, ip)
+                TRACE_FIELD(char *, fmt, fmt)
+                TRACE_FIELD_ZERO_CHAR(buf)
+        ),
+        TP_RAW_FMT("%08lx (%d) fmt:%p %s")
+);
+
+TRACE_EVENT_FORMAT(print, TRACE_PRINT, print_entry, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(unsigned long, ip, ip)
+                TRACE_FIELD_ZERO_CHAR(buf)
+        ),
+        TP_RAW_FMT("%08lx (%d) fmt:%p %s")
+);
+
+TRACE_EVENT_FORMAT(branch, TRACE_BRANCH, trace_branch, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(unsigned int, line, line)
+                TRACE_FIELD_SPECIAL(char func[TRACE_FUNC_SIZE+1], func, func)
+                TRACE_FIELD_SPECIAL(char file[TRACE_FUNC_SIZE+1], file, file)
+                TRACE_FIELD(char, correct, correct)
+        ),
+        TP_RAW_FMT("%u:%s:%s (%u)")
+);
+
+TRACE_EVENT_FORMAT(hw_branch, TRACE_HW_BRANCHES, hw_branch_entry, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(u64, from, from)
+                TRACE_FIELD(u64, to, to)
+        ),
+        TP_RAW_FMT("from: %llx to: %llx")
+);
+
+TRACE_EVENT_FORMAT(power, TRACE_POWER, trace_power, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(ktime_t, state_data.stamp, stamp)
+                TRACE_FIELD(ktime_t, state_data.end, end)
+                TRACE_FIELD(int, state_data.type, type)
+                TRACE_FIELD(int, state_data.state, state)
+        ),
+        TP_RAW_FMT("%llx->%llx type:%u state:%u")
+);
+
+TRACE_EVENT_FORMAT(kmem_alloc, TRACE_KMEM_ALLOC, kmemtrace_alloc_entry, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(enum kmemtrace_type_id, type_id, type_id)
+                TRACE_FIELD(unsigned long, call_site, call_site)
+                TRACE_FIELD(const void *, ptr, ptr)
+                TRACE_FIELD(size_t, bytes_req, bytes_req)
+                TRACE_FIELD(size_t, bytes_alloc, bytes_alloc)
+                TRACE_FIELD(gfp_t, gfp_flags, gfp_flags)
+                TRACE_FIELD(int, node, node)
+        ),
+        TP_RAW_FMT("type:%u call_site:%lx ptr:%p req:%lu alloc:%lu"
+                 " flags:%x node:%d")
+);
+
+TRACE_EVENT_FORMAT(kmem_free, TRACE_KMEM_FREE, kmemtrace_free_entry, ignore,
+        TRACE_STRUCT(
+                TRACE_FIELD(enum kmemtrace_type_id, type_id, type_id)
+                TRACE_FIELD(unsigned long, call_site, call_site)
+                TRACE_FIELD(const void *, ptr, ptr)
+        ),
+        TP_RAW_FMT("type:%u call_site:%lx ptr:%p")
+);
+
+#undef TRACE_SYSTEM
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
new file mode 100644
index 000000000000..64ec4d278ffb
--- /dev/null
+++ b/kernel/trace/trace_events.c
@@ -0,0 +1,824 @@
+/*
+ * event tracer
+ *
+ * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ *  - Added format output of fields of the trace point.
+ *    This was based off of work by Tom Zanussi <tzanussi@gmail.com>.
+ *
+ */
+
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/ctype.h>
+
+#include "trace_output.h"
+
+#define TRACE_SYSTEM "TRACE_SYSTEM"
+
+static DEFINE_MUTEX(event_mutex);
+
+int trace_define_field(struct ftrace_event_call *call, char *type,
+                       char *name, int offset, int size)
+{
+        struct ftrace_event_field *field;
+
+        field = kzalloc(sizeof(*field), GFP_KERNEL);
+        if (!field)
+                goto err;
+
+        field->name = kstrdup(name, GFP_KERNEL);
+        if (!field->name)
+                goto err;
+
+        field->type = kstrdup(type, GFP_KERNEL);
+        if (!field->type)
+                goto err;
+
+        field->offset = offset;
+        field->size = size;
+        list_add(&field->link, &call->fields);
+
+        return 0;
+
+err:
+        if (field) {
+                kfree(field->name);
+                kfree(field->type);
+        }
+        kfree(field);
+
+        return -ENOMEM;
+}
+
+static void ftrace_clear_events(void)
+{
+        struct ftrace_event_call *call = (void *)__start_ftrace_events;
+
+
+        while ((unsigned long)call < (unsigned long)__stop_ftrace_events) {
+
+                if (call->enabled) {
+                        call->enabled = 0;
+                        call->unregfunc();
+                }
+                call++;
+        }
+}
+
+static void ftrace_event_enable_disable(struct ftrace_event_call *call,
+                                        int enable)
+{
+
+        switch (enable) {
+        case 0:
+                if (call->enabled) {
+                        call->enabled = 0;
+                        call->unregfunc();
+                }
+                break;
+        case 1:
+                if (!call->enabled) {
+                        call->enabled = 1;
+                        call->regfunc();
+                }
+                break;
+        }
+}
+
+static int ftrace_set_clr_event(char *buf, int set)
+{
+        struct ftrace_event_call *call = __start_ftrace_events;
+        char *event = NULL, *sub = NULL, *match;
+        int ret = -EINVAL;
+
+        /*
+         * The buf format can be <subsystem>:<event-name>
+         *  *:<event-name> means any event by that name.
+         *  :<event-name> is the same.
+         *
+         *  <subsystem>:* means all events in that subsystem
+         *  <subsystem>: means the same.
+         *
+         *  <name> (no ':') means all events in a subsystem with
+         *  the name <name> or any event that matches <name>
+         */
+
+        match = strsep(&buf, ":");
+        if (buf) {
+                sub = match;
+                event = buf;
+                match = NULL;
+
+                if (!strlen(sub) || strcmp(sub, "*") == 0)
+                        sub = NULL;
+                if (!strlen(event) || strcmp(event, "*") == 0)
+                        event = NULL;
+        }
+
+        mutex_lock(&event_mutex);
+        for_each_event(call) {
+
+                if (!call->name || !call->regfunc)
+                        continue;
+
+                if (match &&
+                    strcmp(match, call->name) != 0 &&
+                    strcmp(match, call->system) != 0)
+                        continue;
+
+                if (sub && strcmp(sub, call->system) != 0)
+                        continue;
+
+                if (event && strcmp(event, call->name) != 0)
+                        continue;
+
+                ftrace_event_enable_disable(call, set);
+
+                ret = 0;
+        }
+        mutex_unlock(&event_mutex);
+
+        return ret;
+}
+
+/* 128 should be much more than enough */
+#define EVENT_BUF_SIZE          127
+
+static ssize_t
+ftrace_event_write(struct file *file, const char __user *ubuf,
+                   size_t cnt, loff_t *ppos)
+{
+        size_t read = 0;
+        int i, set = 1;
+        ssize_t ret;
+        char *buf;
+        char ch;
+
+        if (!cnt || cnt < 0)
+                return 0;
+
+        ret = tracing_update_buffers();
+        if (ret < 0)
+                return ret;
+
+        ret = get_user(ch, ubuf++);
+        if (ret)
+                return ret;
+        read++;
+        cnt--;
+
+        /* skip white space */
+        while (cnt && isspace(ch)) {
+                ret = get_user(ch, ubuf++);
+                if (ret)
+                        return ret;
+                read++;
+                cnt--;
+        }
+
+        /* Only white space found? */
+        if (isspace(ch)) {
+                file->f_pos += read;
+                ret = read;
+                return ret;
+        }
+
+        buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL);
+        if (!buf)
+                return -ENOMEM;
+
+        if (cnt > EVENT_BUF_SIZE)
+                cnt = EVENT_BUF_SIZE;
+
+        i = 0;
+        while (cnt && !isspace(ch)) {
+                if (!i && ch == '!')
+                        set = 0;
+                else
+                        buf[i++] = ch;
+
+                ret = get_user(ch, ubuf++);
+                if (ret)
+                        goto out_free;
+                read++;
+                cnt--;
+        }
+        buf[i] = 0;
+
+        file->f_pos += read;
+
+        ret = ftrace_set_clr_event(buf, set);
+        if (ret)
+                goto out_free;
+
+        ret = read;
+
+ out_free:
+        kfree(buf);
+
+        return ret;
+}
+
+static void *
+t_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        struct ftrace_event_call *call = m->private;
+        struct ftrace_event_call *next = call;
+
+        (*pos)++;
+
+        for (;;) {
+                if ((unsigned long)call >= (unsigned long)__stop_ftrace_events)
+                        return NULL;
+
+                /*
+                 * The ftrace subsystem is for showing formats only.
+                 * They can not be enabled or disabled via the event files.
+                 */
+                if (call->regfunc)
+                        break;
+
+                call++;
+                next = call;
+        }
+
+        m->private = ++next;
+
+        return call;
+}
+
+static void *t_start(struct seq_file *m, loff_t *pos)
+{
+        return t_next(m, NULL, pos);
+}
+
+static void *
+s_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        struct ftrace_event_call *call = m->private;
+        struct ftrace_event_call *next;
+
+        (*pos)++;
+
+ retry:
+        if ((unsigned long)call >= (unsigned long)__stop_ftrace_events)
+                return NULL;
+
+        if (!call->enabled) {
+                call++;
+                goto retry;
+        }
+
+        next = call;
+        m->private = ++next;
+
+        return call;
+}
+
+static void *s_start(struct seq_file *m, loff_t *pos)
+{
+        return s_next(m, NULL, pos);
+}
+
+static int t_show(struct seq_file *m, void *v)
+{
+        struct ftrace_event_call *call = v;
+
+        if (strcmp(call->system, TRACE_SYSTEM) != 0)
+                seq_printf(m, "%s:", call->system);
+        seq_printf(m, "%s\n", call->name);
+
+        return 0;
+}
+
+static void t_stop(struct seq_file *m, void *p)
+{
+}
+
+static int
+ftrace_event_seq_open(struct inode *inode, struct file *file)
+{
+        int ret;
+        const struct seq_operations *seq_ops;
+
+        if ((file->f_mode & FMODE_WRITE) &&
+            !(file->f_flags & O_APPEND))
+                ftrace_clear_events();
+
+        seq_ops = inode->i_private;
+        ret = seq_open(file, seq_ops);
+        if (!ret) {
+                struct seq_file *m = file->private_data;
+
+                m->private = __start_ftrace_events;
+        }
+        return ret;
+}
+
+static ssize_t
+event_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
+                  loff_t *ppos)
+{
+        struct ftrace_event_call *call = filp->private_data;
+        char *buf;
+
+        if (call->enabled)
+                buf = "1\n";
+        else
+                buf = "0\n";
+
+        return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
+}
+
+static ssize_t
+event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
+                   loff_t *ppos)
+{
+        struct ftrace_event_call *call = filp->private_data;
+        char buf[64];
+        unsigned long val;
+        int ret;
+
+        if (cnt >= sizeof(buf))
+                return -EINVAL;
+
+        if (copy_from_user(&buf, ubuf, cnt))
+                return -EFAULT;
+
+        buf[cnt] = 0;
+
+        ret = strict_strtoul(buf, 10, &val);
+        if (ret < 0)
+                return ret;
+
+        ret = tracing_update_buffers();
+        if (ret < 0)
+                return ret;
+
+        switch (val) {
+        case 0:
+        case 1:
+                mutex_lock(&event_mutex);
+                ftrace_event_enable_disable(call, val);
+                mutex_unlock(&event_mutex);
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        *ppos += cnt;
+
+        return cnt;
+}
+
+#undef FIELD
+#define FIELD(type, name)                                               \
+        #type, "common_" #name, offsetof(typeof(field), name),          \
+                sizeof(field.name)
+
+static int trace_write_header(struct trace_seq *s)
+{
+        struct trace_entry field;
+
+        /* struct trace_entry */
+        return trace_seq_printf(s,
+                                "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
+                                "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
+                                "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
+                                "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
+                                "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
+                                "\n",
+                                FIELD(unsigned char, type),
+                                FIELD(unsigned char, flags),
+                                FIELD(unsigned char, preempt_count),
+                                FIELD(int, pid),
+                                FIELD(int, tgid));
+}
+
+static ssize_t
+event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
+                  loff_t *ppos)
+{
+        struct ftrace_event_call *call = filp->private_data;
+        struct trace_seq *s;
+        char *buf;
+        int r;
+
+        if (*ppos)
+                return 0;
+
+        s = kmalloc(sizeof(*s), GFP_KERNEL);
+        if (!s)
+                return -ENOMEM;
+
+        trace_seq_init(s);
+
+        /* If any of the first writes fail, so will the show_format. */
+
+        trace_seq_printf(s, "name: %s\n", call->name);
+        trace_seq_printf(s, "ID: %d\n", call->id);
+        trace_seq_printf(s, "format:\n");
+        trace_write_header(s);
+
+        r = call->show_format(s);
+        if (!r) {
+                /*
+                 * ug!  The format output is bigger than a PAGE!!
+                 */
+                buf = "FORMAT TOO BIG\n";
+                r = simple_read_from_buffer(ubuf, cnt, ppos,
+                                              buf, strlen(buf));
+                goto out;
+        }
+
+        r = simple_read_from_buffer(ubuf, cnt, ppos,
+                                    s->buffer, s->len);
+ out:
+        kfree(s);
+        return r;
+}
+
+static ssize_t
+event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
+{
+        struct ftrace_event_call *call = filp->private_data;
+        struct trace_seq *s;
+        int r;
+
+        if (*ppos)
+                return 0;
+
+        s = kmalloc(sizeof(*s), GFP_KERNEL);
+        if (!s)
+                return -ENOMEM;
+
+        trace_seq_init(s);
+        trace_seq_printf(s, "%d\n", call->id);
+
+        r = simple_read_from_buffer(ubuf, cnt, ppos,
+                                    s->buffer, s->len);
+        kfree(s);
+        return r;
+}
+
+static ssize_t
+event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
+                  loff_t *ppos)
+{
+        struct ftrace_event_call *call = filp->private_data;
+        struct trace_seq *s;
+        int r;
+
+        if (*ppos)
+                return 0;
+
+        s = kmalloc(sizeof(*s), GFP_KERNEL);
+        if (!s)
+                return -ENOMEM;
+
+        trace_seq_init(s);
+
+        filter_print_preds(call->preds, s);
+        r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
+
+        kfree(s);
+
+        return r;
+}
+
+static ssize_t
+event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
+                   loff_t *ppos)
+{
+        struct ftrace_event_call *call = filp->private_data;
+        char buf[64], *pbuf = buf;
+        struct filter_pred *pred;
+        int err;
+
+        if (cnt >= sizeof(buf))
+                return -EINVAL;
+
+        if (copy_from_user(&buf, ubuf, cnt))
+                return -EFAULT;
+
+        pred = kzalloc(sizeof(*pred), GFP_KERNEL);
+        if (!pred)
+                return -ENOMEM;
+
+        err = filter_parse(&pbuf, pred);
+        if (err < 0) {
+                filter_free_pred(pred);
+                return err;
+        }
+
+        if (pred->clear) {
+                filter_free_preds(call);
+                filter_free_pred(pred);
+                return cnt;
+        }
+
+        if (filter_add_pred(call, pred)) {
+                filter_free_pred(pred);
+                return -EINVAL;
+        }
+
+        *ppos += cnt;
+
+        return cnt;
+}
+
+static ssize_t
+subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
+                      loff_t *ppos)
+{
+        struct event_subsystem *system = filp->private_data;
+        struct trace_seq *s;
+        int r;
+
+        if (*ppos)
+                return 0;
+
+        s = kmalloc(sizeof(*s), GFP_KERNEL);
+        if (!s)
+                return -ENOMEM;
+
+        trace_seq_init(s);
+
+        filter_print_preds(system->preds, s);
+        r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
+
+        kfree(s);
+
+        return r;
+}
+
+static ssize_t
+subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
+                       loff_t *ppos)
+{
+        struct event_subsystem *system = filp->private_data;
+        char buf[64], *pbuf = buf;
+        struct filter_pred *pred;
+        int err;
+
+        if (cnt >= sizeof(buf))
+                return -EINVAL;
+
+        if (copy_from_user(&buf, ubuf, cnt))
+                return -EFAULT;
+
+        pred = kzalloc(sizeof(*pred), GFP_KERNEL);
+        if (!pred)
+                return -ENOMEM;
+
+        err = filter_parse(&pbuf, pred);
+        if (err < 0) {
+                filter_free_pred(pred);
+                return err;
+        }
+
+        if (pred->clear) {
+                filter_free_subsystem_preds(system);
+                filter_free_pred(pred);
+                return cnt;
+        }
+
+        if (filter_add_subsystem_pred(system, pred)) {
+                filter_free_subsystem_preds(system);
+                filter_free_pred(pred);
+                return -EINVAL;
+        }
+
+        *ppos += cnt;
+
+        return cnt;
+}
+
+static const struct seq_operations show_event_seq_ops = {
+        .start = t_start,
+        .next = t_next,
+        .show = t_show,
+        .stop = t_stop,
+};
+
+static const struct seq_operations show_set_event_seq_ops = {
+        .start = s_start,
+        .next = s_next,
+        .show = t_show,
+        .stop = t_stop,
+};
+
+static const struct file_operations ftrace_avail_fops = {
+        .open = ftrace_event_seq_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = seq_release,
+};
+
+static const struct file_operations ftrace_set_event_fops = {
+        .open = ftrace_event_seq_open,
+        .read = seq_read,
+        .write = ftrace_event_write,
+        .llseek = seq_lseek,
+        .release = seq_release,
+};
+
+static const struct file_operations ftrace_enable_fops = {
+        .open = tracing_open_generic,
+        .read = event_enable_read,
+        .write = event_enable_write,
+};
+
+static const struct file_operations ftrace_event_format_fops = {
+        .open = tracing_open_generic,
+        .read = event_format_read,
+};
+
+static const struct file_operations ftrace_event_id_fops = {
+        .open = tracing_open_generic,
+        .read = event_id_read,
+};
+
+static const struct file_operations ftrace_event_filter_fops = {
+        .open = tracing_open_generic,
+        .read = event_filter_read,
+        .write = event_filter_write,
+};
+
+static const struct file_operations ftrace_subsystem_filter_fops = {
+        .open = tracing_open_generic,
+        .read = subsystem_filter_read,
+        .write = subsystem_filter_write,
+};
+
+static struct dentry *event_trace_events_dir(void)
+{
+        static struct dentry *d_tracer;
+        static struct dentry *d_events;
+
+        if (d_events)
+                return d_events;
+
+        d_tracer = tracing_init_dentry();
+        if (!d_tracer)
+                return NULL;
+
+        d_events = debugfs_create_dir("events", d_tracer);
+        if (!d_events)
+                pr_warning("Could not create debugfs "
+                           "'events' directory\n");
+
+        return d_events;
+}
+
+static LIST_HEAD(event_subsystems);
+
+static struct dentry *
+event_subsystem_dir(const char *name, struct dentry *d_events)
+{
+        struct event_subsystem *system;
+
+        /* First see if we did not already create this dir */
+        list_for_each_entry(system, &event_subsystems, list) {
+                if (strcmp(system->name, name) == 0)
+                        return system->entry;
+        }
+
+        /* need to create new entry */
+        system = kmalloc(sizeof(*system), GFP_KERNEL);
+        if (!system) {
+                pr_warning("No memory to create event subsystem %s\n",
+                           name);
+                return d_events;
+        }
+
+        system->entry = debugfs_create_dir(name, d_events);
+        if (!system->entry) {
+                pr_warning("Could not create event subsystem %s\n",
+                           name);
+                kfree(system);
+                return d_events;
+        }
+
+        system->name = name;
+        list_add(&system->list, &event_subsystems);
+
+        system->preds = NULL;
+
+        return system->entry;
+}
+
+static int
+event_create_dir(struct ftrace_event_call *call, struct dentry *d_events)
+{
+        struct dentry *entry;
+        int ret;
+
+        /*
+         * If the trace point header did not define TRACE_SYSTEM
+         * then the system would be called "TRACE_SYSTEM".
+         */
+        if (strcmp(call->system, "TRACE_SYSTEM") != 0)
+                d_events = event_subsystem_dir(call->system, d_events);
+
+        if (call->raw_init) {
+                ret = call->raw_init();
+                if (ret < 0) {
+                        pr_warning("Could not initialize trace point"
+                                   " events/%s\n", call->name);
+                        return ret;
+                }
+        }
+
+        call->dir = debugfs_create_dir(call->name, d_events);
+        if (!call->dir) {
+                pr_warning("Could not create debugfs "
+                           "'%s' directory\n", call->name);
+                return -1;
+        }
+
+        if (call->regfunc) {
+                entry = debugfs_create_file("enable", 0644, call->dir, call,
+                                            &ftrace_enable_fops);
+                if (!entry)
+                        pr_warning("Could not create debugfs "
+                                   "'%s/enable' entry\n", call->name);
+        }
+
+        if (call->id) {
+                entry = debugfs_create_file("id", 0444, call->dir, call,
+                                &ftrace_event_id_fops);
+                if (!entry)
+                        pr_warning("Could not create debugfs '%s/id' entry\n",
+                                        call->name);
+        }
+
+        if (call->define_fields) {
+                ret = call->define_fields();
+                if (ret < 0) {
+                        pr_warning("Could not initialize trace point"
+                                   " events/%s\n", call->name);
+                        return ret;
+                }
+                entry = debugfs_create_file("filter", 0644, call->dir, call,
+                                            &ftrace_event_filter_fops);
+                if (!entry)
+                        pr_warning("Could not create debugfs "
+                                   "'%s/filter' entry\n", call->name);
+        }
+
+        /* A trace may not want to export its format */
+        if (!call->show_format)
+                return 0;
+
+        entry = debugfs_create_file("format", 0444, call->dir, call,
+                                    &ftrace_event_format_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs "
+                           "'%s/format' entry\n", call->name);
+
+        return 0;
+}
+
+static __init int event_trace_init(void)
+{
+        struct ftrace_event_call *call = __start_ftrace_events;
+        struct dentry *d_tracer;
+        struct dentry *entry;
+        struct dentry *d_events;
+
+        d_tracer = tracing_init_dentry();
+        if (!d_tracer)
+                return 0;
+
+        entry = debugfs_create_file("available_events", 0444, d_tracer,
+                                    (void *)&show_event_seq_ops,
+                                    &ftrace_avail_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs "
+                           "'available_events' entry\n");
+
+        entry = debugfs_create_file("set_event", 0644, d_tracer,
+                                    (void *)&show_set_event_seq_ops,
+                                    &ftrace_set_event_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs "
+                           "'set_event' entry\n");
+
+        d_events = event_trace_events_dir();
+        if (!d_events)
+                return 0;
+
+        for_each_event(call) {
+                /* The linker may leave blanks */
+                if (!call->name)
+                        continue;
+                event_create_dir(call, d_events);
+        }
+
+        return 0;
+}
+fs_initcall(event_trace_init);
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
new file mode 100644
index 000000000000..026be412f356
--- /dev/null
+++ b/kernel/trace/trace_events_filter.c
@@ -0,0 +1,427 @@
+/*
+ * trace_events_filter - generic event filtering
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) 2009 Tom Zanussi <tzanussi@gmail.com>
+ */
+
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/ctype.h>
+
+#include "trace.h"
+#include "trace_output.h"
+
+static int filter_pred_64(struct filter_pred *pred, void *event)
+{
+        u64 *addr = (u64 *)(event + pred->offset);
+        u64 val = (u64)pred->val;
+        int match;
+
+        match = (val == *addr) ^ pred->not;
+
+        return match;
+}
+
+static int filter_pred_32(struct filter_pred *pred, void *event)
+{
+        u32 *addr = (u32 *)(event + pred->offset);
+        u32 val = (u32)pred->val;
+        int match;
+
+        match = (val == *addr) ^ pred->not;
+
+        return match;
+}
+
+static int filter_pred_16(struct filter_pred *pred, void *event)
+{
+        u16 *addr = (u16 *)(event + pred->offset);
+        u16 val = (u16)pred->val;
+        int match;
+
+        match = (val == *addr) ^ pred->not;
+
+        return match;
+}
+
+static int filter_pred_8(struct filter_pred *pred, void *event)
+{
+        u8 *addr = (u8 *)(event + pred->offset);
+        u8 val = (u8)pred->val;
+        int match;
+
+        match = (val == *addr) ^ pred->not;
+
+        return match;
+}
+
+static int filter_pred_string(struct filter_pred *pred, void *event)
+{
+        char *addr = (char *)(event + pred->offset);
+        int cmp, match;
+
+        cmp = strncmp(addr, pred->str_val, pred->str_len);
+
+        match = (!cmp) ^ pred->not;
+
+        return match;
+}
+
+/* return 1 if event matches, 0 otherwise (discard) */
+int filter_match_preds(struct ftrace_event_call *call, void *rec)
+{
+        int i, matched, and_failed = 0;
+        struct filter_pred *pred;
+
+        for (i = 0; i < MAX_FILTER_PRED; i++) {
+                if (call->preds[i]) {
+                        pred = call->preds[i];
+                        if (and_failed && !pred->or)
+                                continue;
+                        matched = pred->fn(pred, rec);
+                        if (!matched && !pred->or) {
+                                and_failed = 1;
+                                continue;
+                        } else if (matched && pred->or)
+                                return 1;
+                } else
+                        break;
+        }
+
+        if (and_failed)
+                return 0;
+
+        return 1;
+}
+
+void filter_print_preds(struct filter_pred **preds, struct trace_seq *s)
+{
+        char *field_name;
+        struct filter_pred *pred;
+        int i;
+
+        if (!preds) {
+                trace_seq_printf(s, "none\n");
+                return;
+        }
+
+        for (i = 0; i < MAX_FILTER_PRED; i++) {
+                if (preds[i]) {
+                        pred = preds[i];
+                        field_name = pred->field_name;
+                        if (i)
+                                trace_seq_printf(s, pred->or ? "|| " : "&& ");
+                        trace_seq_printf(s, "%s ", field_name);
+                        trace_seq_printf(s, pred->not ? "!= " : "== ");
+                        if (pred->str_val)
+                                trace_seq_printf(s, "%s\n", pred->str_val);
+                        else
+                                trace_seq_printf(s, "%llu\n", pred->val);
+                } else
+                        break;
+        }
+}
+
+static struct ftrace_event_field *
+find_event_field(struct ftrace_event_call *call, char *name)
+{
+        struct ftrace_event_field *field;
+
+        list_for_each_entry(field, &call->fields, link) {
+                if (!strcmp(field->name, name))
+                        return field;
+        }
+
+        return NULL;
+}
+
+void filter_free_pred(struct filter_pred *pred)
+{
+        if (!pred)
+                return;
+
+        kfree(pred->field_name);
+        kfree(pred->str_val);
+        kfree(pred);
+}
+
+void filter_free_preds(struct ftrace_event_call *call)
+{
+        int i;
+
+        if (call->preds) {
+                for (i = 0; i < MAX_FILTER_PRED; i++)
+                        filter_free_pred(call->preds[i]);
+                kfree(call->preds);
+                call->preds = NULL;
+        }
+}
+
+void filter_free_subsystem_preds(struct event_subsystem *system)
+{
+        struct ftrace_event_call *call = __start_ftrace_events;
+        int i;
+
+        if (system->preds) {
+                for (i = 0; i < MAX_FILTER_PRED; i++)
+                        filter_free_pred(system->preds[i]);
+                kfree(system->preds);
+                system->preds = NULL;
+        }
+
+        events_for_each(call) {
+                if (!call->name || !call->regfunc)
+                        continue;
+
+                if (!strcmp(call->system, system->name))
+                        filter_free_preds(call);
+        }
+}
+
+static int __filter_add_pred(struct ftrace_event_call *call,
+                             struct filter_pred *pred)
+{
+        int i;
+
+        if (call->preds && !pred->compound)
+                filter_free_preds(call);
+
+        if (!call->preds) {
+                call->preds = kzalloc(MAX_FILTER_PRED * sizeof(pred),
+                                      GFP_KERNEL);
+                if (!call->preds)
+                        return -ENOMEM;
+        }
+
+        for (i = 0; i < MAX_FILTER_PRED; i++) {
+                if (!call->preds[i]) {
+                        call->preds[i] = pred;
+                        return 0;
+                }
+        }
+
+        return -ENOMEM;
+}
+
+static int is_string_field(const char *type)
+{
+        if (strchr(type, '[') && strstr(type, "char"))
+                return 1;
+
+        return 0;
+}
+
+int filter_add_pred(struct ftrace_event_call *call, struct filter_pred *pred)
+{
+        struct ftrace_event_field *field;
+
+        field = find_event_field(call, pred->field_name);
+        if (!field)
+                return -EINVAL;
+
+        pred->offset = field->offset;
+
+        if (is_string_field(field->type)) {
+                if (!pred->str_val)
+                        return -EINVAL;
+                pred->fn = filter_pred_string;
+                pred->str_len = field->size;
+                return __filter_add_pred(call, pred);
+        } else {
+                if (pred->str_val)
+                        return -EINVAL;
+        }
+
+        switch (field->size) {
+        case 8:
+                pred->fn = filter_pred_64;
+                break;
+        case 4:
+                pred->fn = filter_pred_32;
+                break;
+        case 2:
+                pred->fn = filter_pred_16;
+                break;
+        case 1:
+                pred->fn = filter_pred_8;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return __filter_add_pred(call, pred);
+}
+
+static struct filter_pred *copy_pred(struct filter_pred *pred)
+{
+        struct filter_pred *new_pred = kmalloc(sizeof(*pred), GFP_KERNEL);
+        if (!new_pred)
+                return NULL;
+
+        memcpy(new_pred, pred, sizeof(*pred));
+
+        if (pred->field_name) {
+                new_pred->field_name = kstrdup(pred->field_name, GFP_KERNEL);
+                if (!new_pred->field_name) {
+                        kfree(new_pred);
+                        return NULL;
+                }
+        }
+
+        if (pred->str_val) {
+                new_pred->str_val = kstrdup(pred->str_val, GFP_KERNEL);
+                if (!new_pred->str_val) {
+                        filter_free_pred(new_pred);
+                        return NULL;
+                }
+        }
+
+        return new_pred;
+}
+
+int filter_add_subsystem_pred(struct event_subsystem *system,
+                              struct filter_pred *pred)
+{
+        struct ftrace_event_call *call = __start_ftrace_events;
+        struct filter_pred *event_pred;
+        int i;
+
+        if (system->preds && !pred->compound)
+                filter_free_subsystem_preds(system);
+
+        if (!system->preds) {
+                system->preds = kzalloc(MAX_FILTER_PRED * sizeof(pred),
+                                        GFP_KERNEL);
+                if (!system->preds)
+                        return -ENOMEM;
+        }
+
+        for (i = 0; i < MAX_FILTER_PRED; i++) {
+                if (!system->preds[i]) {
+                        system->preds[i] = pred;
+                        break;
+                }
+        }
+
+        if (i == MAX_FILTER_PRED)
+                return -EINVAL;
+
+        events_for_each(call) {
+                int err;
+
+                if (!call->name || !call->regfunc)
+                        continue;
+
+                if (strcmp(call->system, system->name))
+                        continue;
+
+                if (!find_event_field(call, pred->field_name))
+                        continue;
+
+                event_pred = copy_pred(pred);
+                if (!event_pred)
+                        goto oom;
+
+                err = filter_add_pred(call, event_pred);
+                if (err)
+                        filter_free_pred(event_pred);
+                if (err == -ENOMEM)
+                        goto oom;
+        }
+
+        return 0;
+
+oom:
+        system->preds[i] = NULL;
+        return -ENOMEM;
+}
+
+int filter_parse(char **pbuf, struct filter_pred *pred)
+{
+        char *tmp, *tok, *val_str = NULL;
+        int tok_n = 0;
+
+        /* field ==/!= number, or/and field ==/!= number, number */
+        while ((tok = strsep(pbuf, " \n"))) {
+                if (tok_n == 0) {
+                        if (!strcmp(tok, "0")) {
+                                pred->clear = 1;
+                                return 0;
+                        } else if (!strcmp(tok, "&&")) {
+                                pred->or = 0;
+                                pred->compound = 1;
+                        } else if (!strcmp(tok, "||")) {
+                                pred->or = 1;
+                                pred->compound = 1;
+                        } else
+                                pred->field_name = tok;
+                        tok_n = 1;
+                        continue;
+                }
+                if (tok_n == 1) {
+                        if (!pred->field_name)
+                                pred->field_name = tok;
+                        else if (!strcmp(tok, "!="))
+                                pred->not = 1;
+                        else if (!strcmp(tok, "=="))
+                                pred->not = 0;
+                        else {
+                                pred->field_name = NULL;
+                                return -EINVAL;
+                        }
+                        tok_n = 2;
+                        continue;
+                }
+                if (tok_n == 2) {
+                        if (pred->compound) {
+                                if (!strcmp(tok, "!="))
+                                        pred->not = 1;
+                                else if (!strcmp(tok, "=="))
+                                        pred->not = 0;
+                                else {
+                                        pred->field_name = NULL;
+                                        return -EINVAL;
+                                }
+                        } else {
+                                val_str = tok;
+                                break; /* done */
+                        }
+                        tok_n = 3;
+                        continue;
+                }
+                if (tok_n == 3) {
+                        val_str = tok;
+                        break; /* done */
+                }
+        }
+
+        pred->field_name = kstrdup(pred->field_name, GFP_KERNEL);
+        if (!pred->field_name)
+                return -ENOMEM;
+
+        pred->val = simple_strtoull(val_str, &tmp, 10);
+        if (tmp == val_str) {
+                pred->str_val = kstrdup(val_str, GFP_KERNEL);
+                if (!pred->str_val)
+                        return -ENOMEM;
+        }
+
+        return 0;
+}
+
+
diff --git a/kernel/trace/trace_events_stage_1.h b/kernel/trace/trace_events_stage_1.h
new file mode 100644
index 000000000000..38985f9b379c
--- /dev/null
+++ b/kernel/trace/trace_events_stage_1.h
@@ -0,0 +1,39 @@
+/*
+ * Stage 1 of the trace events.
+ *
+ * Override the macros in <trace/trace_event_types.h> to include the following:
+ *
+ * struct ftrace_raw_<call> {
+ *      struct trace_entry              ent;
+ *      <type>                          <item>;
+ *      <type2>                         <item2>[<len>];
+ *      [...]
+ * };
+ *
+ * The <type> <item> is created by the __field(type, item) macro or
+ * the __array(type2, item2, len) macro.
+ * We simply do "type item;", and that will create the fields
+ * in the structure.
+ */
+
+#undef TRACE_FORMAT
+#define TRACE_FORMAT(call, proto, args, fmt)
+
+#undef __array
+#define __array(type, item, len)        type    item[len];
+
+#undef __field
+#define __field(type, item)             type    item;
+
+#undef TP_STRUCT__entry
+#define TP_STRUCT__entry(args...) args
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(name, proto, args, tstruct, assign, print)  \
+        struct ftrace_raw_##name {                              \
+                struct trace_entry      ent;                    \
+                tstruct                                         \
+        };                                                      \
+        static struct ftrace_event_call event_##name
+
+#include <trace/trace_event_types.h>
diff --git a/kernel/trace/trace_events_stage_2.h b/kernel/trace/trace_events_stage_2.h
new file mode 100644
index 000000000000..30743f7d4110
--- /dev/null
+++ b/kernel/trace/trace_events_stage_2.h
@@ -0,0 +1,176 @@
+/*
+ * Stage 2 of the trace events.
+ *
+ * Override the macros in <trace/trace_event_types.h> to include the following:
+ *
+ * enum print_line_t
+ * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
+ * {
+ *      struct trace_seq *s = &iter->seq;
+ *      struct ftrace_raw_<call> *field; <-- defined in stage 1
+ *      struct trace_entry *entry;
+ *      int ret;
+ *
+ *      entry = iter->ent;
+ *
+ *      if (entry->type != event_<call>.id) {
+ *              WARN_ON_ONCE(1);
+ *              return TRACE_TYPE_UNHANDLED;
+ *      }
+ *
+ *      field = (typeof(field))entry;
+ *
+ *      ret = trace_seq_printf(s, <TP_printk> "\n");
+ *      if (!ret)
+ *              return TRACE_TYPE_PARTIAL_LINE;
+ *
+ *      return TRACE_TYPE_HANDLED;
+ * }
+ *
+ * This is the method used to print the raw event to the trace
+ * output format. Note, this is not needed if the data is read
+ * in binary.
+ */
+
+#undef __entry
+#define __entry field
+
+#undef TP_printk
+#define TP_printk(fmt, args...) fmt "\n", args
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
+enum print_line_t                                                       \
+ftrace_raw_output_##call(struct trace_iterator *iter, int flags)        \
+{                                                                       \
+        struct trace_seq *s = &iter->seq;                               \
+        struct ftrace_raw_##call *field;                                \
+        struct trace_entry *entry;                                      \
+        int ret;                                                        \
+                                                                        \
+        entry = iter->ent;                                              \
+                                                                        \
+        if (entry->type != event_##call.id) {                           \
+                WARN_ON_ONCE(1);                                        \
+                return TRACE_TYPE_UNHANDLED;                            \
+        }                                                               \
+                                                                        \
+        field = (typeof(field))entry;                                   \
+                                                                        \
+        ret = trace_seq_printf(s, #call ": " print);                    \
+        if (!ret)                                                       \
+                return TRACE_TYPE_PARTIAL_LINE;                         \
+                                                                        \
+        return TRACE_TYPE_HANDLED;                                      \
+}
+        
+#include <trace/trace_event_types.h>
+
+/*
+ * Setup the showing format of trace point.
+ *
+ * int
+ * ftrace_format_##call(struct trace_seq *s)
+ * {
+ *      struct ftrace_raw_##call field;
+ *      int ret;
+ *
+ *      ret = trace_seq_printf(s, #type " " #item ";"
+ *                             " offset:%u; size:%u;\n",
+ *                             offsetof(struct ftrace_raw_##call, item),
+ *                             sizeof(field.type));
+ *
+ * }
+ */
+
+#undef TP_STRUCT__entry
+#define TP_STRUCT__entry(args...) args
+
+#undef __field
+#define __field(type, item)                                     \
+        ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"      \
+                               "offset:%u;\tsize:%u;\n",                \
+                               (unsigned int)offsetof(typeof(field), item), \
+                               (unsigned int)sizeof(field.item));       \
+        if (!ret)                                                       \
+                return 0;
+
+#undef __array
+#define __array(type, item, len)                                                \
+        ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t"    \
+                               "offset:%u;\tsize:%u;\n",                \
+                               (unsigned int)offsetof(typeof(field), item), \
+                               (unsigned int)sizeof(field.item));       \
+        if (!ret)                                                       \
+                return 0;
+
+#undef __entry
+#define __entry "REC"
+
+#undef TP_printk
+#define TP_printk(fmt, args...) "%s, %s\n", #fmt, #args
+
+#undef TP_fast_assign
+#define TP_fast_assign(args...) args
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
+static int                                                              \
+ftrace_format_##call(struct trace_seq *s)                               \
+{                                                                       \
+        struct ftrace_raw_##call field;                                 \
+        int ret;                                                        \
+                                                                        \
+        tstruct;                                                        \
+                                                                        \
+        trace_seq_printf(s, "\nprint fmt: " print);                     \
+                                                                        \
+        return ret;                                                     \
+}
+
+#include <trace/trace_event_types.h>
+
+#undef __field
+#define __field(type, item)                                             \
+        ret = trace_define_field(event_call, #type, #item,              \
+                                 offsetof(typeof(field), item),         \
+                                 sizeof(field.item));                   \
+        if (ret)                                                        \
+                return ret;
+
+#undef __array
+#define __array(type, item, len)                                        \
+        ret = trace_define_field(event_call, #type "[" #len "]", #item, \
+                                 offsetof(typeof(field), item),         \
+                                 sizeof(field.item));                   \
+        if (ret)                                                        \
+                return ret;
+
+#define __common_field(type, item)                                      \
+        ret = trace_define_field(event_call, #type, "common_" #item,    \
+                                 offsetof(typeof(field.ent), item),     \
+                                 sizeof(field.ent.item));               \
+        if (ret)                                                        \
+                return ret;
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
+int                                                                     \
+ftrace_define_fields_##call(void)                                       \
+{                                                                       \
+        struct ftrace_raw_##call field;                                 \
+        struct ftrace_event_call *event_call = &event_##call;           \
+        int ret;                                                        \
+                                                                        \
+        __common_field(unsigned char, type);                            \
+        __common_field(unsigned char, flags);                           \
+        __common_field(unsigned char, preempt_count);                   \
+        __common_field(int, pid);                                       \
+        __common_field(int, tgid);                                      \
+                                                                        \
+        tstruct;                                                        \
+                                                                        \
+        return ret;                                                     \
+}
+
+#include <trace/trace_event_types.h>
diff --git a/kernel/trace/trace_events_stage_3.h b/kernel/trace/trace_events_stage_3.h
new file mode 100644
index 000000000000..9d2fa78cecca
--- /dev/null
+++ b/kernel/trace/trace_events_stage_3.h
@@ -0,0 +1,281 @@
+/*
+ * Stage 3 of the trace events.
+ *
+ * Override the macros in <trace/trace_event_types.h> to include the following:
+ *
+ * static void ftrace_event_<call>(proto)
+ * {
+ *      event_trace_printk(_RET_IP_, "<call>: " <fmt>);
+ * }
+ *
+ * static int ftrace_reg_event_<call>(void)
+ * {
+ *      int ret;
+ *
+ *      ret = register_trace_<call>(ftrace_event_<call>);
+ *      if (!ret)
+ *              pr_info("event trace: Could not activate trace point "
+ *                      "probe to  <call>");
+ *      return ret;
+ * }
+ *
+ * static void ftrace_unreg_event_<call>(void)
+ * {
+ *      unregister_trace_<call>(ftrace_event_<call>);
+ * }
+ *
+ * For those macros defined with TRACE_FORMAT:
+ *
+ * static struct ftrace_event_call __used
+ * __attribute__((__aligned__(4)))
+ * __attribute__((section("_ftrace_events"))) event_<call> = {
+ *      .name                   = "<call>",
+ *      .regfunc                = ftrace_reg_event_<call>,
+ *      .unregfunc              = ftrace_unreg_event_<call>,
+ * }
+ *
+ *
+ * For those macros defined with TRACE_EVENT:
+ *
+ * static struct ftrace_event_call event_<call>;
+ *
+ * static void ftrace_raw_event_<call>(proto)
+ * {
+ *      struct ring_buffer_event *event;
+ *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
+ *      unsigned long irq_flags;
+ *      int pc;
+ *
+ *      local_save_flags(irq_flags);
+ *      pc = preempt_count();
+ *
+ *      event = trace_current_buffer_lock_reserve(event_<call>.id,
+ *                                sizeof(struct ftrace_raw_<call>),
+ *                                irq_flags, pc);
+ *      if (!event)
+ *              return;
+ *      entry   = ring_buffer_event_data(event);
+ *
+ *      <assign>;  <-- Here we assign the entries by the __field and
+ *                      __array macros.
+ *
+ *      trace_current_buffer_unlock_commit(event, irq_flags, pc);
+ * }
+ *
+ * static int ftrace_raw_reg_event_<call>(void)
+ * {
+ *      int ret;
+ *
+ *      ret = register_trace_<call>(ftrace_raw_event_<call>);
+ *      if (!ret)
+ *              pr_info("event trace: Could not activate trace point "
+ *                      "probe to <call>");
+ *      return ret;
+ * }
+ *
+ * static void ftrace_unreg_event_<call>(void)
+ * {
+ *      unregister_trace_<call>(ftrace_raw_event_<call>);
+ * }
+ *
+ * static struct trace_event ftrace_event_type_<call> = {
+ *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
+ * };
+ *
+ * static int ftrace_raw_init_event_<call>(void)
+ * {
+ *      int id;
+ *
+ *      id = register_ftrace_event(&ftrace_event_type_<call>);
+ *      if (!id)
+ *              return -ENODEV;
+ *      event_<call>.id = id;
+ *      return 0;
+ * }
+ *
+ * static struct ftrace_event_call __used
+ * __attribute__((__aligned__(4)))
+ * __attribute__((section("_ftrace_events"))) event_<call> = {
+ *      .name                   = "<call>",
+ *      .system                 = "<system>",
+ *      .raw_init               = ftrace_raw_init_event_<call>,
+ *      .regfunc                = ftrace_reg_event_<call>,
+ *      .unregfunc              = ftrace_unreg_event_<call>,
+ *      .show_format            = ftrace_format_<call>,
+ * }
+ *
+ */
+
+#undef TP_FMT
+#define TP_FMT(fmt, args...)    fmt "\n", ##args
+
+#ifdef CONFIG_EVENT_PROFILE
+#define _TRACE_PROFILE(call, proto, args)                               \
+static void ftrace_profile_##call(proto)                                \
+{                                                                       \
+        extern void perf_tpcounter_event(int);                          \
+        perf_tpcounter_event(event_##call.id);                          \
+}                                                                       \
+                                                                        \
+static int ftrace_profile_enable_##call(struct ftrace_event_call *call) \
+{                                                                       \
+        int ret = 0;                                                    \
+                                                                        \
+        if (!atomic_inc_return(&call->profile_count))                   \
+                ret = register_trace_##call(ftrace_profile_##call);     \
+                                                                        \
+        return ret;                                                     \
+}                                                                       \
+                                                                        \
+static void ftrace_profile_disable_##call(struct ftrace_event_call *call) \
+{                                                                       \
+        if (atomic_add_negative(-1, &call->profile_count))              \
+                unregister_trace_##call(ftrace_profile_##call);         \
+}
+
+#define _TRACE_PROFILE_INIT(call)                                       \
+        .profile_count = ATOMIC_INIT(-1),                               \
+        .profile_enable = ftrace_profile_enable_##call,                 \
+        .profile_disable = ftrace_profile_disable_##call,
+
+#else
+#define _TRACE_PROFILE(call, proto, args)
+#define _TRACE_PROFILE_INIT(call)
+#endif
+
+#define _TRACE_FORMAT(call, proto, args, fmt)                           \
+static void ftrace_event_##call(proto)                                  \
+{                                                                       \
+        event_trace_printk(_RET_IP_, #call ": " fmt);                   \
+}                                                                       \
+                                                                        \
+static int ftrace_reg_event_##call(void)                                \
+{                                                                       \
+        int ret;                                                        \
+                                                                        \
+        ret = register_trace_##call(ftrace_event_##call);               \
+        if (ret)                                                        \
+                pr_info("event trace: Could not activate trace point "  \
+                        "probe to " #call "\n");                        \
+        return ret;                                                     \
+}                                                                       \
+                                                                        \
+static void ftrace_unreg_event_##call(void)                             \
+{                                                                       \
+        unregister_trace_##call(ftrace_event_##call);                   \
+}                                                                       \
+                                                                        \
+static struct ftrace_event_call event_##call;                           \
+                                                                        \
+static int ftrace_init_event_##call(void)                               \
+{                                                                       \
+        int id;                                                         \
+                                                                        \
+        id = register_ftrace_event(NULL);                               \
+        if (!id)                                                        \
+                return -ENODEV;                                         \
+        event_##call.id = id;                                           \
+        return 0;                                                       \
+}
+
+#undef TRACE_FORMAT
+#define TRACE_FORMAT(call, proto, args, fmt)                            \
+_TRACE_FORMAT(call, PARAMS(proto), PARAMS(args), PARAMS(fmt))           \
+_TRACE_PROFILE(call, PARAMS(proto), PARAMS(args))                       \
+static struct ftrace_event_call __used                                  \
+__attribute__((__aligned__(4)))                                         \
+__attribute__((section("_ftrace_events"))) event_##call = {             \
+        .name                   = #call,                                \
+        .system                 = __stringify(TRACE_SYSTEM),            \
+        .raw_init               = ftrace_init_event_##call,             \
+        .regfunc                = ftrace_reg_event_##call,              \
+        .unregfunc              = ftrace_unreg_event_##call,            \
+        _TRACE_PROFILE_INIT(call)                                       \
+}
+
+#undef __entry
+#define __entry entry
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
+_TRACE_PROFILE(call, PARAMS(proto), PARAMS(args))                       \
+                                                                        \
+static struct ftrace_event_call event_##call;                           \
+                                                                        \
+static void ftrace_raw_event_##call(proto)                              \
+{                                                                       \
+        struct ftrace_event_call *call = &event_##call;                 \
+        struct ring_buffer_event *event;                                \
+        struct ftrace_raw_##call *entry;                                \
+        unsigned long irq_flags;                                        \
+        int pc;                                                         \
+                                                                        \
+        local_save_flags(irq_flags);                                    \
+        pc = preempt_count();                                           \
+                                                                        \
+        event = trace_current_buffer_lock_reserve(event_##call.id,      \
+                                  sizeof(struct ftrace_raw_##call),     \
+                                  irq_flags, pc);                       \
+        if (!event)                                                     \
+                return;                                                 \
+        entry   = ring_buffer_event_data(event);                        \
+                                                                        \
+        assign;                                                         \
+                                                                        \
+        if (call->preds && !filter_match_preds(call, entry))            \
+                ring_buffer_event_discard(event);                       \
+                                                                        \
+        trace_nowake_buffer_unlock_commit(event, irq_flags, pc);        \
+                                                                        \
+}                                                                       \
+                                                                        \
+static int ftrace_raw_reg_event_##call(void)                            \
+{                                                                       \
+        int ret;                                                        \
+                                                                        \
+        ret = register_trace_##call(ftrace_raw_event_##call);           \
+        if (ret)                                                        \
+                pr_info("event trace: Could not activate trace point "  \
+                        "probe to " #call "\n");                        \
+        return ret;                                                     \
+}                                                                       \
+                                                                        \
+static void ftrace_raw_unreg_event_##call(void)                         \
+{                                                                       \
+        unregister_trace_##call(ftrace_raw_event_##call);               \
+}                                                                       \
+                                                                        \
+static struct trace_event ftrace_event_type_##call = {                  \
+        .trace                  = ftrace_raw_output_##call,             \
+};                                                                      \
+                                                                        \
+static int ftrace_raw_init_event_##call(void)                           \
+{                                                                       \
+        int id;                                                         \
+                                                                        \
+        id = register_ftrace_event(&ftrace_event_type_##call);          \
+        if (!id)                                                        \
+                return -ENODEV;                                         \
+        event_##call.id = id;                                           \
+        INIT_LIST_HEAD(&event_##call.fields);                           \
+        return 0;                                                       \
+}                                                                       \
+                                                                        \
+static struct ftrace_event_call __used                                  \
+__attribute__((__aligned__(4)))                                         \
+__attribute__((section("_ftrace_events"))) event_##call = {             \
+        .name                   = #call,                                \
+        .system                 = __stringify(TRACE_SYSTEM),            \
+        .raw_init               = ftrace_raw_init_event_##call,         \
+        .regfunc                = ftrace_raw_reg_event_##call,          \
+        .unregfunc              = ftrace_raw_unreg_event_##call,        \
+        .show_format            = ftrace_format_##call,                 \
+        .define_fields          = ftrace_define_fields_##call,          \
+        _TRACE_PROFILE_INIT(call)                                       \
+}
+
+#include <trace/trace_event_types.h>
+
+#undef _TRACE_PROFILE
+#undef _TRACE_PROFILE_INIT
+
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
new file mode 100644
index 000000000000..07a22c33ebf3
--- /dev/null
+++ b/kernel/trace/trace_export.c
@@ -0,0 +1,102 @@
+/*
+ * trace_export.c - export basic ftrace utilities to user space
+ *
+ * Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com>
+ */
+#include <linux/stringify.h>
+#include <linux/kallsyms.h>
+#include <linux/seq_file.h>
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/ftrace.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+
+#include "trace_output.h"
+
+
+#undef TRACE_STRUCT
+#define TRACE_STRUCT(args...) args
+
+#undef TRACE_FIELD
+#define TRACE_FIELD(type, item, assign)                                 \
+        ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"      \
+                               "offset:%u;\tsize:%u;\n",                \
+                               (unsigned int)offsetof(typeof(field), item), \
+                               (unsigned int)sizeof(field.item));       \
+        if (!ret)                                                       \
+                return 0;
+
+
+#undef TRACE_FIELD_SPECIAL
+#define TRACE_FIELD_SPECIAL(type_item, item, cmd)                       \
+        ret = trace_seq_printf(s, "\tfield special:" #type_item ";\t"   \
+                               "offset:%u;\tsize:%u;\n",                \
+                               (unsigned int)offsetof(typeof(field), item), \
+                               (unsigned int)sizeof(field.item));       \
+        if (!ret)                                                       \
+                return 0;
+
+#undef TRACE_FIELD_ZERO_CHAR
+#define TRACE_FIELD_ZERO_CHAR(item)                                     \
+        ret = trace_seq_printf(s, "\tfield:char " #item ";\t"           \
+                               "offset:%u;\tsize:0;\n",                 \
+                               (unsigned int)offsetof(typeof(field), item)); \
+        if (!ret)                                                       \
+                return 0;
+
+
+#undef TP_RAW_FMT
+#define TP_RAW_FMT(args...) args
+
+#undef TRACE_EVENT_FORMAT
+#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
+static int                                                              \
+ftrace_format_##call(struct trace_seq *s)                               \
+{                                                                       \
+        struct args field;                                              \
+        int ret;                                                        \
+                                                                        \
+        tstruct;                                                        \
+                                                                        \
+        trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt);            \
+                                                                        \
+        return ret;                                                     \
+}
+
+#include "trace_event_types.h"
+
+#undef TRACE_ZERO_CHAR
+#define TRACE_ZERO_CHAR(arg)
+
+#undef TRACE_FIELD
+#define TRACE_FIELD(type, item, assign)\
+        entry->item = assign;
+
+#undef TRACE_FIELD
+#define TRACE_FIELD(type, item, assign)\
+        entry->item = assign;
+
+#undef TP_CMD
+#define TP_CMD(cmd...)  cmd
+
+#undef TRACE_ENTRY
+#define TRACE_ENTRY     entry
+
+#undef TRACE_FIELD_SPECIAL
+#define TRACE_FIELD_SPECIAL(type_item, item, cmd) \
+        cmd;
+
+#undef TRACE_EVENT_FORMAT
+#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
+                                                                        \
+static struct ftrace_event_call __used                                  \
+__attribute__((__aligned__(4)))                                         \
+__attribute__((section("_ftrace_events"))) event_##call = {             \
+        .name                   = #call,                                \
+        .id                     = proto,                                \
+        .system                 = __stringify(TRACE_SYSTEM),            \
+        .show_format            = ftrace_format_##call,                 \
+}
+#include "trace_event_types.h"
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index 9236d7e25a16..c9a0b7df44ff 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -9,6 +9,7 @@
  *  Copyright (C) 2004-2006 Ingo Molnar
  *  Copyright (C) 2004 William Lee Irwin III
  */
+#include <linux/ring_buffer.h>
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/ftrace.h>
@@ -16,52 +17,388 @@
 
 #include "trace.h"
 
-static void start_function_trace(struct trace_array *tr)
+/* function tracing enabled */
+static int                      ftrace_function_enabled;
+
+static struct trace_array       *func_trace;
+
+static void tracing_start_function_trace(void);
+static void tracing_stop_function_trace(void);
+
+static int function_trace_init(struct trace_array *tr)
 {
+        func_trace = tr;
         tr->cpu = get_cpu();
-        tracing_reset_online_cpus(tr);
         put_cpu();
 
         tracing_start_cmdline_record();
         tracing_start_function_trace();
+        return 0;
 }
 
-static void stop_function_trace(struct trace_array *tr)
+static void function_trace_reset(struct trace_array *tr)
 {
         tracing_stop_function_trace();
         tracing_stop_cmdline_record();
 }
 
-static int function_trace_init(struct trace_array *tr)
+static void function_trace_start(struct trace_array *tr)
 {
-        start_function_trace(tr);
-        return 0;
+        tracing_reset_online_cpus(tr);
 }
 
-static void function_trace_reset(struct trace_array *tr)
+static void
+function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
+{
+        struct trace_array *tr = func_trace;
+        struct trace_array_cpu *data;
+        unsigned long flags;
+        long disabled;
+        int cpu, resched;
+        int pc;
+
+        if (unlikely(!ftrace_function_enabled))
+                return;
+
+        pc = preempt_count();
+        resched = ftrace_preempt_disable();
+        local_save_flags(flags);
+        cpu = raw_smp_processor_id();
+        data = tr->data[cpu];
+        disabled = atomic_inc_return(&data->disabled);
+
+        if (likely(disabled == 1))
+                trace_function(tr, ip, parent_ip, flags, pc);
+
+        atomic_dec(&data->disabled);
+        ftrace_preempt_enable(resched);
+}
+
+static void
+function_trace_call(unsigned long ip, unsigned long parent_ip)
 {
-        stop_function_trace(tr);
+        struct trace_array *tr = func_trace;
+        struct trace_array_cpu *data;
+        unsigned long flags;
+        long disabled;
+        int cpu;
+        int pc;
+
+        if (unlikely(!ftrace_function_enabled))
+                return;
+
+        /*
+         * Need to use raw, since this must be called before the
+         * recursive protection is performed.
+         */
+        local_irq_save(flags);
+        cpu = raw_smp_processor_id();
+        data = tr->data[cpu];
+        disabled = atomic_inc_return(&data->disabled);
+
+        if (likely(disabled == 1)) {
+                pc = preempt_count();
+                trace_function(tr, ip, parent_ip, flags, pc);
+        }
+
+        atomic_dec(&data->disabled);
+        local_irq_restore(flags);
 }
 
-static void function_trace_start(struct trace_array *tr)
+static void
+function_stack_trace_call(unsigned long ip, unsigned long parent_ip)
 {
-        tracing_reset_online_cpus(tr);
+        struct trace_array *tr = func_trace;
+        struct trace_array_cpu *data;
+        unsigned long flags;
+        long disabled;
+        int cpu;
+        int pc;
+
+        if (unlikely(!ftrace_function_enabled))
+                return;
+
+        /*
+         * Need to use raw, since this must be called before the
+         * recursive protection is performed.
+         */
+        local_irq_save(flags);
+        cpu = raw_smp_processor_id();
+        data = tr->data[cpu];
+        disabled = atomic_inc_return(&data->disabled);
+
+        if (likely(disabled == 1)) {
+                pc = preempt_count();
+                trace_function(tr, ip, parent_ip, flags, pc);
+                /*
+                 * skip over 5 funcs:
+                 *    __ftrace_trace_stack,
+                 *    __trace_stack,
+                 *    function_stack_trace_call
+                 *    ftrace_list_func
+                 *    ftrace_call
+                 */
+                __trace_stack(tr, flags, 5, pc);
+        }
+
+        atomic_dec(&data->disabled);
+        local_irq_restore(flags);
+}
+
+
+static struct ftrace_ops trace_ops __read_mostly =
+{
+        .func = function_trace_call,
+};
+
+static struct ftrace_ops trace_stack_ops __read_mostly =
+{
+        .func = function_stack_trace_call,
+};
+
+/* Our two options */
+enum {
+        TRACE_FUNC_OPT_STACK = 0x1,
+};
+
+static struct tracer_opt func_opts[] = {
+#ifdef CONFIG_STACKTRACE
+        { TRACER_OPT(func_stack_trace, TRACE_FUNC_OPT_STACK) },
+#endif
+        { } /* Always set a last empty entry */
+};
+
+static struct tracer_flags func_flags = {
+        .val = 0, /* By default: all flags disabled */
+        .opts = func_opts
+};
+
+static void tracing_start_function_trace(void)
+{
+        ftrace_function_enabled = 0;
+
+        if (trace_flags & TRACE_ITER_PREEMPTONLY)
+                trace_ops.func = function_trace_call_preempt_only;
+        else
+                trace_ops.func = function_trace_call;
+
+        if (func_flags.val & TRACE_FUNC_OPT_STACK)
+                register_ftrace_function(&trace_stack_ops);
+        else
+                register_ftrace_function(&trace_ops);
+
+        ftrace_function_enabled = 1;
+}
+
+static void tracing_stop_function_trace(void)
+{
+        ftrace_function_enabled = 0;
+        /* OK if they are not registered */
+        unregister_ftrace_function(&trace_stack_ops);
+        unregister_ftrace_function(&trace_ops);
+}
+
+static int func_set_flag(u32 old_flags, u32 bit, int set)
+{
+        if (bit == TRACE_FUNC_OPT_STACK) {
+                /* do nothing if already set */
+                if (!!set == !!(func_flags.val & TRACE_FUNC_OPT_STACK))
+                        return 0;
+
+                if (set) {
+                        unregister_ftrace_function(&trace_ops);
+                        register_ftrace_function(&trace_stack_ops);
+                } else {
+                        unregister_ftrace_function(&trace_stack_ops);
+                        register_ftrace_function(&trace_ops);
+                }
+
+                return 0;
+        }
+
+        return -EINVAL;
 }
 
 static struct tracer function_trace __read_mostly =
 {
-        .name        = "function",
-        .init        = function_trace_init,
-        .reset       = function_trace_reset,
-        .start       = function_trace_start,
+        .name           = "function",
+        .init           = function_trace_init,
+        .reset          = function_trace_reset,
+        .start          = function_trace_start,
+        .wait_pipe      = poll_wait_pipe,
+        .flags          = &func_flags,
+        .set_flag       = func_set_flag,
 #ifdef CONFIG_FTRACE_SELFTEST
-        .selftest    = trace_selftest_startup_function,
+        .selftest       = trace_selftest_startup_function,
 #endif
 };
 
+#ifdef CONFIG_DYNAMIC_FTRACE
+static void
+ftrace_traceon(unsigned long ip, unsigned long parent_ip, void **data)
+{
+        long *count = (long *)data;
+
+        if (tracing_is_on())
+                return;
+
+        if (!*count)
+                return;
+
+        if (*count != -1)
+                (*count)--;
+
+        tracing_on();
+}
+
+static void
+ftrace_traceoff(unsigned long ip, unsigned long parent_ip, void **data)
+{
+        long *count = (long *)data;
+
+        if (!tracing_is_on())
+                return;
+
+        if (!*count)
+                return;
+
+        if (*count != -1)
+                (*count)--;
+
+        tracing_off();
+}
+
+static int
+ftrace_trace_onoff_print(struct seq_file *m, unsigned long ip,
+                         struct ftrace_probe_ops *ops, void *data);
+
+static struct ftrace_probe_ops traceon_probe_ops = {
+        .func                   = ftrace_traceon,
+        .print                  = ftrace_trace_onoff_print,
+};
+
+static struct ftrace_probe_ops traceoff_probe_ops = {
+        .func                   = ftrace_traceoff,
+        .print                  = ftrace_trace_onoff_print,
+};
+
+static int
+ftrace_trace_onoff_print(struct seq_file *m, unsigned long ip,
+                         struct ftrace_probe_ops *ops, void *data)
+{
+        char str[KSYM_SYMBOL_LEN];
+        long count = (long)data;
+
+        kallsyms_lookup(ip, NULL, NULL, NULL, str);
+        seq_printf(m, "%s:", str);
+
+        if (ops == &traceon_probe_ops)
+                seq_printf(m, "traceon");
+        else
+                seq_printf(m, "traceoff");
+
+        if (count == -1)
+                seq_printf(m, ":unlimited\n");
+        else
+                seq_printf(m, ":count=%ld", count);
+        seq_putc(m, '\n');
+
+        return 0;
+}
+
+static int
+ftrace_trace_onoff_unreg(char *glob, char *cmd, char *param)
+{
+        struct ftrace_probe_ops *ops;
+
+        /* we register both traceon and traceoff to this callback */
+        if (strcmp(cmd, "traceon") == 0)
+                ops = &traceon_probe_ops;
+        else
+                ops = &traceoff_probe_ops;
+
+        unregister_ftrace_function_probe_func(glob, ops);
+
+        return 0;
+}
+
+static int
+ftrace_trace_onoff_callback(char *glob, char *cmd, char *param, int enable)
+{
+        struct ftrace_probe_ops *ops;
+        void *count = (void *)-1;
+        char *number;
+        int ret;
+
+        /* hash funcs only work with set_ftrace_filter */
+        if (!enable)
+                return -EINVAL;
+
+        if (glob[0] == '!')
+                return ftrace_trace_onoff_unreg(glob+1, cmd, param);
+
+        /* we register both traceon and traceoff to this callback */
+        if (strcmp(cmd, "traceon") == 0)
+                ops = &traceon_probe_ops;
+        else
+                ops = &traceoff_probe_ops;
+
+        if (!param)
+                goto out_reg;
+
+        number = strsep(&param, ":");
+
+        if (!strlen(number))
+                goto out_reg;
+
+        /*
+         * We use the callback data field (which is a pointer)
+         * as our counter.
+         */
+        ret = strict_strtoul(number, 0, (unsigned long *)&count);
+        if (ret)
+                return ret;
+
+ out_reg:
+        ret = register_ftrace_function_probe(glob, ops, count);
+
+        return ret;
+}
+
+static struct ftrace_func_command ftrace_traceon_cmd = {
+        .name                   = "traceon",
+        .func                   = ftrace_trace_onoff_callback,
+};
+
+static struct ftrace_func_command ftrace_traceoff_cmd = {
+        .name                   = "traceoff",
+        .func                   = ftrace_trace_onoff_callback,
+};
+
+static int __init init_func_cmd_traceon(void)
+{
+        int ret;
+
+        ret = register_ftrace_command(&ftrace_traceoff_cmd);
+        if (ret)
+                return ret;
+
+        ret = register_ftrace_command(&ftrace_traceon_cmd);
+        if (ret)
+                unregister_ftrace_command(&ftrace_traceoff_cmd);
+        return ret;
+}
+#else
+static inline int init_func_cmd_traceon(void)
+{
+        return 0;
+}
+#endif /* CONFIG_DYNAMIC_FTRACE */
+
 static __init int init_function_trace(void)
 {
+        init_func_cmd_traceon();
         return register_tracer(&function_trace);
 }
-
 device_initcall(init_function_trace);
+
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 930c08e5b38e..d28687e7b3a7 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -1,7 +1,7 @@
 /*
  *
  * Function graph tracer.
- * Copyright (c) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ * Copyright (c) 2008-2009 Frederic Weisbecker <fweisbec@gmail.com>
  * Mostly borrowed from function tracer which
  * is Copyright (c) Steven Rostedt <srostedt@redhat.com>
  *
@@ -12,6 +12,12 @@
 #include <linux/fs.h>
 
 #include "trace.h"
+#include "trace_output.h"
+
+struct fgraph_data {
+        pid_t           last_pid;
+        int             depth;
+};
 
 #define TRACE_GRAPH_INDENT      2
 
@@ -20,9 +26,11 @@
 #define TRACE_GRAPH_PRINT_CPU           0x2
 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
 #define TRACE_GRAPH_PRINT_PROC          0x8
+#define TRACE_GRAPH_PRINT_DURATION      0x10
+#define TRACE_GRAPH_PRINT_ABS_TIME      0X20
 
 static struct tracer_opt trace_opts[] = {
-        /* Display overruns ? */
+        /* Display overruns? (for self-debug purpose) */
         { TRACER_OPT(funcgraph-overrun, TRACE_GRAPH_PRINT_OVERRUN) },
         /* Display CPU ? */
         { TRACER_OPT(funcgraph-cpu, TRACE_GRAPH_PRINT_CPU) },
@@ -30,26 +38,103 @@ static struct tracer_opt trace_opts[] = {
         { TRACER_OPT(funcgraph-overhead, TRACE_GRAPH_PRINT_OVERHEAD) },
         /* Display proc name/pid */
         { TRACER_OPT(funcgraph-proc, TRACE_GRAPH_PRINT_PROC) },
+        /* Display duration of execution */
+        { TRACER_OPT(funcgraph-duration, TRACE_GRAPH_PRINT_DURATION) },
+        /* Display absolute time of an entry */
+        { TRACER_OPT(funcgraph-abstime, TRACE_GRAPH_PRINT_ABS_TIME) },
         { } /* Empty entry */
 };
 
 static struct tracer_flags tracer_flags = {
         /* Don't display overruns and proc by default */
-        .val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD,
+        .val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD |
+               TRACE_GRAPH_PRINT_DURATION,
         .opts = trace_opts
 };
 
 /* pid on the last trace processed */
-static pid_t last_pid[NR_CPUS] = { [0 ... NR_CPUS-1] = -1 };
 
-static int graph_trace_init(struct trace_array *tr)
+
+/* Add a function return address to the trace stack on thread info.*/
+int
+ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth)
 {
-        int cpu, ret;
+        unsigned long long calltime;
+        int index;
+
+        if (!current->ret_stack)
+                return -EBUSY;
+
+        /* The return trace stack is full */
+        if (current->curr_ret_stack == FTRACE_RETFUNC_DEPTH - 1) {
+                atomic_inc(&current->trace_overrun);
+                return -EBUSY;
+        }
+
+        calltime = trace_clock_local();
+
+        index = ++current->curr_ret_stack;
+        barrier();
+        current->ret_stack[index].ret = ret;
+        current->ret_stack[index].func = func;
+        current->ret_stack[index].calltime = calltime;
+        *depth = index;
+
+        return 0;
+}
+
+/* Retrieve a function return address to the trace stack on thread info.*/
+void
+ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret)
+{
+        int index;
+
+        index = current->curr_ret_stack;
+
+        if (unlikely(index < 0)) {
+                ftrace_graph_stop();
+                WARN_ON(1);
+                /* Might as well panic, otherwise we have no where to go */
+                *ret = (unsigned long)panic;
+                return;
+        }
 
-        for_each_online_cpu(cpu)
-                tracing_reset(tr, cpu);
+        *ret = current->ret_stack[index].ret;
+        trace->func = current->ret_stack[index].func;
+        trace->calltime = current->ret_stack[index].calltime;
+        trace->overrun = atomic_read(&current->trace_overrun);
+        trace->depth = index;
+        barrier();
+        current->curr_ret_stack--;
 
-        ret = register_ftrace_graph(&trace_graph_return,
+}
+
+/*
+ * Send the trace to the ring-buffer.
+ * @return the original return address.
+ */
+unsigned long ftrace_return_to_handler(void)
+{
+        struct ftrace_graph_ret trace;
+        unsigned long ret;
+
+        ftrace_pop_return_trace(&trace, &ret);
+        trace.rettime = trace_clock_local();
+        ftrace_graph_return(&trace);
+
+        if (unlikely(!ret)) {
+                ftrace_graph_stop();
+                WARN_ON(1);
+                /* Might as well panic. What else to do? */
+                ret = (unsigned long)panic;
+        }
+
+        return ret;
+}
+
+static int graph_trace_init(struct trace_array *tr)
+{
+        int ret = register_ftrace_graph(&trace_graph_return,
                                         &trace_graph_entry);
         if (ret)
                 return ret;
@@ -112,15 +197,15 @@ print_graph_cpu(struct trace_seq *s, int cpu)
 static enum print_line_t
 print_graph_proc(struct trace_seq *s, pid_t pid)
 {
-        int i;
-        int ret;
-        int len;
-        char comm[8];
-        int spaces = 0;
+        char comm[TASK_COMM_LEN];
         /* sign + log10(MAX_INT) + '\0' */
         char pid_str[11];
+        int spaces = 0;
+        int ret;
+        int len;
+        int i;
 
-        strncpy(comm, trace_find_cmdline(pid), 7);
+        trace_find_cmdline(pid, comm);
         comm[7] = '\0';
         sprintf(pid_str, "%d", pid);
 
@@ -153,17 +238,25 @@ print_graph_proc(struct trace_seq *s, pid_t pid)
 
 /* If the pid changed since the last trace, output this event */
 static enum print_line_t
-verif_pid(struct trace_seq *s, pid_t pid, int cpu)
+verif_pid(struct trace_seq *s, pid_t pid, int cpu, struct fgraph_data *data)
 {
         pid_t prev_pid;
+        pid_t *last_pid;
         int ret;
 
-        if (last_pid[cpu] != -1 && last_pid[cpu] == pid)
+        if (!data)
                 return TRACE_TYPE_HANDLED;
 
-        prev_pid = last_pid[cpu];
-        last_pid[cpu] = pid;
+        last_pid = &(per_cpu_ptr(data, cpu)->last_pid);
 
+        if (*last_pid == pid)
+                return TRACE_TYPE_HANDLED;
+
+        prev_pid = *last_pid;
+        *last_pid = pid;
+
+        if (prev_pid == -1)
+                return TRACE_TYPE_HANDLED;
 /*
  * Context-switch trace line:
 
@@ -175,34 +268,34 @@ verif_pid(struct trace_seq *s, pid_t pid, int cpu)
         ret = trace_seq_printf(s,
                 " ------------------------------------------\n");
         if (!ret)
-                TRACE_TYPE_PARTIAL_LINE;
+                return TRACE_TYPE_PARTIAL_LINE;
 
         ret = print_graph_cpu(s, cpu);
         if (ret == TRACE_TYPE_PARTIAL_LINE)
-                TRACE_TYPE_PARTIAL_LINE;
+                return TRACE_TYPE_PARTIAL_LINE;
 
         ret = print_graph_proc(s, prev_pid);
         if (ret == TRACE_TYPE_PARTIAL_LINE)
-                TRACE_TYPE_PARTIAL_LINE;
+                return TRACE_TYPE_PARTIAL_LINE;
 
         ret = trace_seq_printf(s, " => ");
         if (!ret)
-                TRACE_TYPE_PARTIAL_LINE;
+                return TRACE_TYPE_PARTIAL_LINE;
 
         ret = print_graph_proc(s, pid);
         if (ret == TRACE_TYPE_PARTIAL_LINE)
-                TRACE_TYPE_PARTIAL_LINE;
+                return TRACE_TYPE_PARTIAL_LINE;
 
         ret = trace_seq_printf(s,
                 "\n ------------------------------------------\n\n");
         if (!ret)
-                TRACE_TYPE_PARTIAL_LINE;
+                return TRACE_TYPE_PARTIAL_LINE;
 
-        return ret;
+        return TRACE_TYPE_HANDLED;
 }
 
-static bool
-trace_branch_is_leaf(struct trace_iterator *iter,
+static struct ftrace_graph_ret_entry *
+get_return_for_leaf(struct trace_iterator *iter,
                 struct ftrace_graph_ent_entry *curr)
 {
         struct ring_buffer_iter *ring_iter;
@@ -211,65 +304,123 @@ trace_branch_is_leaf(struct trace_iterator *iter,
 
         ring_iter = iter->buffer_iter[iter->cpu];
 
-        if (!ring_iter)
-                return false;
-
-        event = ring_buffer_iter_peek(ring_iter, NULL);
+        /* First peek to compare current entry and the next one */
+        if (ring_iter)
+                event = ring_buffer_iter_peek(ring_iter, NULL);
+        else {
+        /* We need to consume the current entry to see the next one */
+                ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL);
+                event = ring_buffer_peek(iter->tr->buffer, iter->cpu,
+                                        NULL);
+        }
 
         if (!event)
-                return false;
+                return NULL;
 
         next = ring_buffer_event_data(event);
 
         if (next->ent.type != TRACE_GRAPH_RET)
-                return false;
+                return NULL;
 
         if (curr->ent.pid != next->ent.pid ||
                         curr->graph_ent.func != next->ret.func)
-                return false;
+                return NULL;
+
+        /* this is a leaf, now advance the iterator */
+        if (ring_iter)
+                ring_buffer_read(ring_iter, NULL);
+
+        return next;
+}
+
+/* Signal a overhead of time execution to the output */
+static int
+print_graph_overhead(unsigned long long duration, struct trace_seq *s)
+{
+        /* If duration disappear, we don't need anything */
+        if (!(tracer_flags.val & TRACE_GRAPH_PRINT_DURATION))
+                return 1;
+
+        /* Non nested entry or return */
+        if (duration == -1)
+                return trace_seq_printf(s, "  ");
+
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+                /* Duration exceeded 100 msecs */
+                if (duration > 100000ULL)
+                        return trace_seq_printf(s, "! ");
 
-        return true;
+                /* Duration exceeded 10 msecs */
+                if (duration > 10000ULL)
+                        return trace_seq_printf(s, "+ ");
+        }
+
+        return trace_seq_printf(s, "  ");
+}
+
+static int print_graph_abs_time(u64 t, struct trace_seq *s)
+{
+        unsigned long usecs_rem;
+
+        usecs_rem = do_div(t, NSEC_PER_SEC);
+        usecs_rem /= 1000;
+
+        return trace_seq_printf(s, "%5lu.%06lu |  ",
+                        (unsigned long)t, usecs_rem);
 }
 
 static enum print_line_t
-print_graph_irq(struct trace_seq *s, unsigned long addr,
-                                enum trace_type type, int cpu, pid_t pid)
+print_graph_irq(struct trace_iterator *iter, unsigned long addr,
+                enum trace_type type, int cpu, pid_t pid)
 {
         int ret;
+        struct trace_seq *s = &iter->seq;
 
         if (addr < (unsigned long)__irqentry_text_start ||
                 addr >= (unsigned long)__irqentry_text_end)
                 return TRACE_TYPE_UNHANDLED;
 
-        if (type == TRACE_GRAPH_ENT) {
-                ret = trace_seq_printf(s, "==========> |  ");
-        } else {
-                /* Cpu */
-                if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
-                        ret = print_graph_cpu(s, cpu);
-                        if (ret == TRACE_TYPE_PARTIAL_LINE)
-                                return TRACE_TYPE_PARTIAL_LINE;
-                }
-                /* Proc */
-                if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
-                        ret = print_graph_proc(s, pid);
-                        if (ret == TRACE_TYPE_PARTIAL_LINE)
-                                return TRACE_TYPE_PARTIAL_LINE;
+        /* Absolute time */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME) {
+                ret = print_graph_abs_time(iter->ts, s);
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
 
-                        ret = trace_seq_printf(s, " | ");
-                        if (!ret)
-                                return TRACE_TYPE_PARTIAL_LINE;
-                }
+        /* Cpu */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+                ret = print_graph_cpu(s, cpu);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+        /* Proc */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+                ret = print_graph_proc(s, pid);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+                ret = trace_seq_printf(s, " | ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
 
-                /* No overhead */
-                if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
-                        ret = trace_seq_printf(s, "  ");
-                        if (!ret)
-                                return TRACE_TYPE_PARTIAL_LINE;
-                }
+        /* No overhead */
+        ret = print_graph_overhead(-1, s);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        if (type == TRACE_GRAPH_ENT)
+                ret = trace_seq_printf(s, "==========>");
+        else
+                ret = trace_seq_printf(s, "<==========");
+
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Don't close the duration column if haven't one */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+                trace_seq_printf(s, " |");
+        ret = trace_seq_printf(s, "\n");
 
-                ret = trace_seq_printf(s, "<========== |\n");
-        }
         if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
         return TRACE_TYPE_HANDLED;
@@ -288,7 +439,7 @@ print_graph_duration(unsigned long long duration, struct trace_seq *s)
         sprintf(msecs_str, "%lu", (unsigned long) duration);
 
         /* Print msecs */
-        ret = trace_seq_printf(s, msecs_str);
+        ret = trace_seq_printf(s, "%s", msecs_str);
         if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
 
@@ -321,52 +472,47 @@ print_graph_duration(unsigned long long duration, struct trace_seq *s)
 
 }
 
-/* Signal a overhead of time execution to the output */
-static int
-print_graph_overhead(unsigned long long duration, struct trace_seq *s)
-{
-        /* Duration exceeded 100 msecs */
-        if (duration > 100000ULL)
-                return trace_seq_printf(s, "! ");
-
-        /* Duration exceeded 10 msecs */
-        if (duration > 10000ULL)
-                return trace_seq_printf(s, "+ ");
-
-        return trace_seq_printf(s, "  ");
-}
-
 /* Case of a leaf function on its call entry */
 static enum print_line_t
 print_graph_entry_leaf(struct trace_iterator *iter,
-                struct ftrace_graph_ent_entry *entry, struct trace_seq *s)
+                struct ftrace_graph_ent_entry *entry,
+                struct ftrace_graph_ret_entry *ret_entry, struct trace_seq *s)
 {
-        struct ftrace_graph_ret_entry *ret_entry;
+        struct fgraph_data *data = iter->private;
         struct ftrace_graph_ret *graph_ret;
-        struct ring_buffer_event *event;
         struct ftrace_graph_ent *call;
         unsigned long long duration;
         int ret;
         int i;
 
-        event = ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
-        ret_entry = ring_buffer_event_data(event);
         graph_ret = &ret_entry->ret;
         call = &entry->graph_ent;
         duration = graph_ret->rettime - graph_ret->calltime;
 
-        /* Overhead */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
-                ret = print_graph_overhead(duration, s);
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
+        if (data) {
+                int cpu = iter->cpu;
+                int *depth = &(per_cpu_ptr(data, cpu)->depth);
+
+                /*
+                 * Comments display at + 1 to depth. Since
+                 * this is a leaf function, keep the comments
+                 * equal to this depth.
+                 */
+                *depth = call->depth - 1;
         }
 
-        /* Duration */
-        ret = print_graph_duration(duration, s);
-        if (ret == TRACE_TYPE_PARTIAL_LINE)
+        /* Overhead */
+        ret = print_graph_overhead(duration, s);
+        if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
 
+        /* Duration */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+                ret = print_graph_duration(duration, s);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
         /* Function */
         for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
                 ret = trace_seq_printf(s, " ");
@@ -386,33 +532,34 @@ print_graph_entry_leaf(struct trace_iterator *iter,
 }
 
 static enum print_line_t
-print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
-                        struct trace_seq *s, pid_t pid, int cpu)
+print_graph_entry_nested(struct trace_iterator *iter,
+                         struct ftrace_graph_ent_entry *entry,
+                         struct trace_seq *s, int cpu)
 {
-        int i;
-        int ret;
         struct ftrace_graph_ent *call = &entry->graph_ent;
+        struct fgraph_data *data = iter->private;
+        int ret;
+        int i;
 
-        /* No overhead */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
-                ret = trace_seq_printf(s, "  ");
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
+        if (data) {
+                int cpu = iter->cpu;
+                int *depth = &(per_cpu_ptr(data, cpu)->depth);
+
+                *depth = call->depth;
         }
 
-        /* Interrupt */
-        ret = print_graph_irq(s, call->func, TRACE_GRAPH_ENT, cpu, pid);
-        if (ret == TRACE_TYPE_UNHANDLED) {
-                /* No time */
+        /* No overhead */
+        ret = print_graph_overhead(-1, s);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* No time */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
                 ret = trace_seq_printf(s, "            |  ");
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
-        } else {
-                if (ret == TRACE_TYPE_PARTIAL_LINE)
-                        return TRACE_TYPE_PARTIAL_LINE;
         }
 
-
         /* Function */
         for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
                 ret = trace_seq_printf(s, " ");
@@ -428,20 +575,40 @@ print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
         if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
 
-        return TRACE_TYPE_HANDLED;
+        /*
+         * we already consumed the current entry to check the next one
+         * and see if this is a leaf.
+         */
+        return TRACE_TYPE_NO_CONSUME;
 }
 
 static enum print_line_t
-print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
-                        struct trace_iterator *iter, int cpu)
+print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
+                     int type, unsigned long addr)
 {
-        int ret;
+        struct fgraph_data *data = iter->private;
         struct trace_entry *ent = iter->ent;
+        int cpu = iter->cpu;
+        int ret;
 
         /* Pid */
-        if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
+        if (verif_pid(s, ent->pid, cpu, data) == TRACE_TYPE_PARTIAL_LINE)
                 return TRACE_TYPE_PARTIAL_LINE;
 
+        if (type) {
+                /* Interrupt */
+                ret = print_graph_irq(iter, addr, type, cpu, ent->pid);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        /* Absolute time */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME) {
+                ret = print_graph_abs_time(iter->ts, s);
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
         /* Cpu */
         if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
                 ret = print_graph_cpu(s, cpu);
@@ -460,54 +627,65 @@ print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
                         return TRACE_TYPE_PARTIAL_LINE;
         }
 
-        if (trace_branch_is_leaf(iter, field))
-                return print_graph_entry_leaf(iter, field, s);
+        return 0;
+}
+
+static enum print_line_t
+print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
+                        struct trace_iterator *iter)
+{
+        int cpu = iter->cpu;
+        struct ftrace_graph_ent *call = &field->graph_ent;
+        struct ftrace_graph_ret_entry *leaf_ret;
+
+        if (print_graph_prologue(iter, s, TRACE_GRAPH_ENT, call->func))
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        leaf_ret = get_return_for_leaf(iter, field);
+        if (leaf_ret)
+                return print_graph_entry_leaf(iter, field, leaf_ret, s);
         else
-                return print_graph_entry_nested(field, s, iter->ent->pid, cpu);
+                return print_graph_entry_nested(iter, field, s, cpu);
 
 }
 
 static enum print_line_t
 print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
-                   struct trace_entry *ent, int cpu)
+                   struct trace_entry *ent, struct trace_iterator *iter)
 {
-        int i;
-        int ret;
         unsigned long long duration = trace->rettime - trace->calltime;
+        struct fgraph_data *data = iter->private;
+        pid_t pid = ent->pid;
+        int cpu = iter->cpu;
+        int ret;
+        int i;
 
-        /* Pid */
-        if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
-                return TRACE_TYPE_PARTIAL_LINE;
+        if (data) {
+                int cpu = iter->cpu;
+                int *depth = &(per_cpu_ptr(data, cpu)->depth);
 
-        /* Cpu */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
-                ret = print_graph_cpu(s, cpu);
-                if (ret == TRACE_TYPE_PARTIAL_LINE)
-                        return TRACE_TYPE_PARTIAL_LINE;
+                /*
+                 * Comments display at + 1 to depth. This is the
+                 * return from a function, we now want the comments
+                 * to display at the same level of the bracket.
+                 */
+                *depth = trace->depth - 1;
         }
 
-        /* Proc */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
-                ret = print_graph_proc(s, ent->pid);
-                if (ret == TRACE_TYPE_PARTIAL_LINE)
-                        return TRACE_TYPE_PARTIAL_LINE;
-
-                ret = trace_seq_printf(s, " | ");
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-        }
+        if (print_graph_prologue(iter, s, 0, 0))
+                return TRACE_TYPE_PARTIAL_LINE;
 
         /* Overhead */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
-                ret = print_graph_overhead(duration, s);
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-        }
+        ret = print_graph_overhead(duration, s);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
 
         /* Duration */
-        ret = print_graph_duration(duration, s);
-        if (ret == TRACE_TYPE_PARTIAL_LINE)
-                return TRACE_TYPE_PARTIAL_LINE;
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+                ret = print_graph_duration(duration, s);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
 
         /* Closing brace */
         for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++) {
@@ -528,7 +706,7 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
                         return TRACE_TYPE_PARTIAL_LINE;
         }
 
-        ret = print_graph_irq(s, trace->func, TRACE_GRAPH_RET, cpu, ent->pid);
+        ret = print_graph_irq(iter, trace->func, TRACE_GRAPH_RET, cpu, pid);
         if (ret == TRACE_TYPE_PARTIAL_LINE)
                 return TRACE_TYPE_PARTIAL_LINE;
 
@@ -536,61 +714,73 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
 }
 
 static enum print_line_t
-print_graph_comment(struct print_entry *trace, struct trace_seq *s,
-                   struct trace_entry *ent, struct trace_iterator *iter)
+print_graph_comment(struct trace_seq *s,  struct trace_entry *ent,
+                    struct trace_iterator *iter)
 {
-        int i;
+        unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
+        struct fgraph_data *data = iter->private;
+        struct trace_event *event;
+        int depth = 0;
         int ret;
+        int i;
 
-        /* Pid */
-        if (verif_pid(s, ent->pid, iter->cpu) == TRACE_TYPE_PARTIAL_LINE)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        /* Cpu */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
-                ret = print_graph_cpu(s, iter->cpu);
-                if (ret == TRACE_TYPE_PARTIAL_LINE)
-                        return TRACE_TYPE_PARTIAL_LINE;
-        }
-
-        /* Proc */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
-                ret = print_graph_proc(s, ent->pid);
-                if (ret == TRACE_TYPE_PARTIAL_LINE)
-                        return TRACE_TYPE_PARTIAL_LINE;
+        if (data)
+                depth = per_cpu_ptr(data, iter->cpu)->depth;
 
-                ret = trace_seq_printf(s, " | ");
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-        }
+        if (print_graph_prologue(iter, s, 0, 0))
+                return TRACE_TYPE_PARTIAL_LINE;
 
         /* No overhead */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
-                ret = trace_seq_printf(s, "  ");
+        ret = print_graph_overhead(-1, s);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* No time */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+                ret = trace_seq_printf(s, "            |  ");
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
         }
 
-        /* No time */
-        ret = trace_seq_printf(s, "            |  ");
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
         /* Indentation */
-        if (trace->depth > 0)
-                for (i = 0; i < (trace->depth + 1) * TRACE_GRAPH_INDENT; i++) {
+        if (depth > 0)
+                for (i = 0; i < (depth + 1) * TRACE_GRAPH_INDENT; i++) {
                         ret = trace_seq_printf(s, " ");
                         if (!ret)
                                 return TRACE_TYPE_PARTIAL_LINE;
                 }
 
         /* The comment */
-        ret = trace_seq_printf(s, "/* %s", trace->buf);
+        ret = trace_seq_printf(s, "/* ");
         if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
 
-        if (ent->flags & TRACE_FLAG_CONT)
-                trace_seq_print_cont(s, iter);
+        switch (iter->ent->type) {
+        case TRACE_BPRINT:
+                ret = trace_print_bprintk_msg_only(iter);
+                if (ret != TRACE_TYPE_HANDLED)
+                        return ret;
+                break;
+        case TRACE_PRINT:
+                ret = trace_print_printk_msg_only(iter);
+                if (ret != TRACE_TYPE_HANDLED)
+                        return ret;
+                break;
+        default:
+                event = ftrace_find_event(ent->type);
+                if (!event)
+                        return TRACE_TYPE_UNHANDLED;
+
+                ret = event->trace(iter, sym_flags);
+                if (ret != TRACE_TYPE_HANDLED)
+                        return ret;
+        }
+
+        /* Strip ending newline */
+        if (s->buffer[s->len - 1] == '\n') {
+                s->buffer[s->len - 1] = '\0';
+                s->len--;
+        }
 
         ret = trace_seq_printf(s, " */\n");
         if (!ret)
@@ -603,62 +793,91 @@ print_graph_comment(struct print_entry *trace, struct trace_seq *s,
 enum print_line_t
 print_graph_function(struct trace_iterator *iter)
 {
-        struct trace_seq *s = &iter->seq;
         struct trace_entry *entry = iter->ent;
+        struct trace_seq *s = &iter->seq;
 
         switch (entry->type) {
         case TRACE_GRAPH_ENT: {
                 struct ftrace_graph_ent_entry *field;
                 trace_assign_type(field, entry);
-                return print_graph_entry(field, s, iter,
-                                         iter->cpu);
+                return print_graph_entry(field, s, iter);
         }
         case TRACE_GRAPH_RET: {
                 struct ftrace_graph_ret_entry *field;
                 trace_assign_type(field, entry);
-                return print_graph_return(&field->ret, s, entry, iter->cpu);
-        }
-        case TRACE_PRINT: {
-                struct print_entry *field;
-                trace_assign_type(field, entry);
-                return print_graph_comment(field, s, entry, iter);
+                return print_graph_return(&field->ret, s, entry, iter);
         }
         default:
-                return TRACE_TYPE_UNHANDLED;
+                return print_graph_comment(s, entry, iter);
         }
+
+        return TRACE_TYPE_HANDLED;
 }
 
 static void print_graph_headers(struct seq_file *s)
 {
         /* 1st line */
         seq_printf(s, "# ");
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME)
+                seq_printf(s, "     TIME       ");
         if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
-                seq_printf(s, "CPU ");
+                seq_printf(s, "CPU");
         if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
-                seq_printf(s, "TASK/PID     ");
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD)
-                seq_printf(s, "OVERHEAD/");
-        seq_printf(s, "DURATION            FUNCTION CALLS\n");
+                seq_printf(s, "  TASK/PID      ");
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+                seq_printf(s, "  DURATION   ");
+        seq_printf(s, "               FUNCTION CALLS\n");
 
         /* 2nd line */
         seq_printf(s, "# ");
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME)
+                seq_printf(s, "      |         ");
         if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
-                seq_printf(s, "|   ");
+                seq_printf(s, "|  ");
         if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
-                seq_printf(s, "|      |     ");
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
-                seq_printf(s, "|        ");
-                seq_printf(s, "|                   |   |   |   |\n");
-        } else
-                seq_printf(s, "    |               |   |   |   |\n");
+                seq_printf(s, "  |    |        ");
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+                seq_printf(s, "   |   |      ");
+        seq_printf(s, "               |   |   |   |\n");
+}
+
+static void graph_trace_open(struct trace_iterator *iter)
+{
+        /* pid and depth on the last trace processed */
+        struct fgraph_data *data = alloc_percpu(struct fgraph_data);
+        int cpu;
+
+        if (!data)
+                pr_warning("function graph tracer: not enough memory\n");
+        else
+                for_each_possible_cpu(cpu) {
+                        pid_t *pid = &(per_cpu_ptr(data, cpu)->last_pid);
+                        int *depth = &(per_cpu_ptr(data, cpu)->depth);
+                        *pid = -1;
+                        *depth = 0;
+                }
+
+        iter->private = data;
 }
+
+static void graph_trace_close(struct trace_iterator *iter)
+{
+        free_percpu(iter->private);
+}
+
 static struct tracer graph_trace __read_mostly = {
-        .name           = "function_graph",
-        .init           = graph_trace_init,
-        .reset          = graph_trace_reset,
+        .name           = "function_graph",
+        .open           = graph_trace_open,
+        .close          = graph_trace_close,
+        .wait_pipe      = poll_wait_pipe,
+        .init           = graph_trace_init,
+        .reset          = graph_trace_reset,
         .print_line     = print_graph_function,
         .print_header   = print_graph_headers,
         .flags          = &tracer_flags,
+#ifdef CONFIG_FTRACE_SELFTEST
+        .selftest       = trace_selftest_startup_function_graph,
+#endif
 };
 
 static __init int init_graph_trace(void)
diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c
index 649df22d435f..7bfdf4c2347f 100644
--- a/kernel/trace/trace_hw_branches.c
+++ b/kernel/trace/trace_hw_branches.c
@@ -1,30 +1,53 @@
 /*
  * h/w branch tracer for x86 based on bts
  *
- * Copyright (C) 2008 Markus Metzger <markus.t.metzger@gmail.com>
- *
+ * Copyright (C) 2008-2009 Intel Corporation.
+ * Markus Metzger <markus.t.metzger@gmail.com>, 2008-2009
  */
-
-#include <linux/module.h>
-#include <linux/fs.h>
+#include <linux/spinlock.h>
+#include <linux/kallsyms.h>
 #include <linux/debugfs.h>
 #include <linux/ftrace.h>
-#include <linux/kallsyms.h>
+#include <linux/module.h>
+#include <linux/cpu.h>
+#include <linux/smp.h>
+#include <linux/fs.h>
 
 #include <asm/ds.h>
 
 #include "trace.h"
+#include "trace_output.h"
 
 
 #define SIZEOF_BTS (1 << 13)
 
+/*
+ * The tracer lock protects the below per-cpu tracer array.
+ * It needs to be held to:
+ * - start tracing on all cpus
+ * - stop tracing on all cpus
+ * - start tracing on a single hotplug cpu
+ * - stop tracing on a single hotplug cpu
+ * - read the trace from all cpus
+ * - read the trace from a single cpu
+ */
+static DEFINE_SPINLOCK(bts_tracer_lock);
 static DEFINE_PER_CPU(struct bts_tracer *, tracer);
 static DEFINE_PER_CPU(unsigned char[SIZEOF_BTS], buffer);
 
 #define this_tracer per_cpu(tracer, smp_processor_id())
 #define this_buffer per_cpu(buffer, smp_processor_id())
 
+static int __read_mostly trace_hw_branches_enabled;
+static struct trace_array *hw_branch_trace __read_mostly;
+
 
+/*
+ * Start tracing on the current cpu.
+ * The argument is ignored.
+ *
+ * pre: bts_tracer_lock must be locked.
+ */
 static void bts_trace_start_cpu(void *arg)
 {
         if (this_tracer)
@@ -42,14 +65,20 @@ static void bts_trace_start_cpu(void *arg)
 
 static void bts_trace_start(struct trace_array *tr)
 {
-        int cpu;
+        spin_lock(&bts_tracer_lock);
 
-        tracing_reset_online_cpus(tr);
+        on_each_cpu(bts_trace_start_cpu, NULL, 1);
+        trace_hw_branches_enabled = 1;
 
-        for_each_cpu(cpu, cpu_possible_mask)
-                smp_call_function_single(cpu, bts_trace_start_cpu, NULL, 1);
+        spin_unlock(&bts_tracer_lock);
 }
 
+/*
+ * Stop tracing on the current cpu.
+ * The argument is ignored.
+ *
+ * pre: bts_tracer_lock must be locked.
+ */
 static void bts_trace_stop_cpu(void *arg)
 {
         if (this_tracer) {
@@ -60,26 +89,60 @@ static void bts_trace_stop_cpu(void *arg)
 
 static void bts_trace_stop(struct trace_array *tr)
 {
-        int cpu;
+        spin_lock(&bts_tracer_lock);
+
+        trace_hw_branches_enabled = 0;
+        on_each_cpu(bts_trace_stop_cpu, NULL, 1);
+
+        spin_unlock(&bts_tracer_lock);
+}
+
+static int __cpuinit bts_hotcpu_handler(struct notifier_block *nfb,
+                                     unsigned long action, void *hcpu)
+{
+        unsigned int cpu = (unsigned long)hcpu;
 
-        for_each_cpu(cpu, cpu_possible_mask)
+        spin_lock(&bts_tracer_lock);
+
+        if (!trace_hw_branches_enabled)
+                goto out;
+
+        switch (action) {
+        case CPU_ONLINE:
+        case CPU_DOWN_FAILED:
+                smp_call_function_single(cpu, bts_trace_start_cpu, NULL, 1);
+                break;
+        case CPU_DOWN_PREPARE:
                 smp_call_function_single(cpu, bts_trace_stop_cpu, NULL, 1);
+                break;
+        }
+
+ out:
+        spin_unlock(&bts_tracer_lock);
+        return NOTIFY_DONE;
 }
 
+static struct notifier_block bts_hotcpu_notifier __cpuinitdata = {
+        .notifier_call = bts_hotcpu_handler
+};
+
 static int bts_trace_init(struct trace_array *tr)
 {
-        tracing_reset_online_cpus(tr);
+        hw_branch_trace = tr;
+
         bts_trace_start(tr);
 
         return 0;
 }
 
+static void bts_trace_reset(struct trace_array *tr)
+{
+        bts_trace_stop(tr);
+}
+
 static void bts_trace_print_header(struct seq_file *m)
 {
-        seq_puts(m,
-                 "# CPU#        FROM                   TO         FUNCTION\n");
-        seq_puts(m,
-                 "#  |           |                     |             |\n");
+        seq_puts(m, "# CPU#        TO  <-  FROM\n");
 }
 
 static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
@@ -87,15 +150,15 @@ static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
         struct trace_entry *entry = iter->ent;
         struct trace_seq *seq = &iter->seq;
         struct hw_branch_entry *it;
+        unsigned long symflags = TRACE_ITER_SYM_OFFSET;
 
         trace_assign_type(it, entry);
 
         if (entry->type == TRACE_HW_BRANCHES) {
-                if (trace_seq_printf(seq, "%4d  ", entry->cpu) &&
-                    trace_seq_printf(seq, "0x%016llx -> 0x%016llx ",
-                                     it->from, it->to) &&
-                    (!it->from ||
-                     seq_print_ip_sym(seq, it->from, /* sym_flags = */ 0)) &&
+                if (trace_seq_printf(seq, "%4d  ", iter->cpu) &&
+                    seq_print_ip_sym(seq, it->to, symflags) &&
+                    trace_seq_printf(seq, "\t  <-  ") &&
+                    seq_print_ip_sym(seq, it->from, symflags) &&
                     trace_seq_printf(seq, "\n"))
                         return TRACE_TYPE_HANDLED;
                 return TRACE_TYPE_PARTIAL_LINE;;
@@ -103,26 +166,42 @@ static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
         return TRACE_TYPE_UNHANDLED;
 }
 
-void trace_hw_branch(struct trace_array *tr, u64 from, u64 to)
+void trace_hw_branch(u64 from, u64 to)
 {
+        struct trace_array *tr = hw_branch_trace;
         struct ring_buffer_event *event;
         struct hw_branch_entry *entry;
-        unsigned long irq;
+        unsigned long irq1;
+        int cpu;
 
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), &irq);
-        if (!event)
+        if (unlikely(!tr))
                 return;
+
+        if (unlikely(!trace_hw_branches_enabled))
+                return;
+
+        local_irq_save(irq1);
+        cpu = raw_smp_processor_id();
+        if (atomic_inc_return(&tr->data[cpu]->disabled) != 1)
+                goto out;
+
+        event = trace_buffer_lock_reserve(tr, TRACE_HW_BRANCHES,
+                                          sizeof(*entry), 0, 0);
+        if (!event)
+                goto out;
         entry   = ring_buffer_event_data(event);
         tracing_generic_entry_update(&entry->ent, 0, from);
         entry->ent.type = TRACE_HW_BRANCHES;
-        entry->ent.cpu = smp_processor_id();
         entry->from = from;
         entry->to   = to;
-        ring_buffer_unlock_commit(tr->buffer, event, irq);
+        trace_buffer_unlock_commit(tr, event, 0, 0);
+
+ out:
+        atomic_dec(&tr->data[cpu]->disabled);
+        local_irq_restore(irq1);
 }
 
-static void trace_bts_at(struct trace_array *tr,
-                         const struct bts_trace *trace, void *at)
+static void trace_bts_at(const struct bts_trace *trace, void *at)
 {
         struct bts_struct bts;
         int err = 0;
@@ -137,18 +216,29 @@ static void trace_bts_at(struct trace_array *tr,
 
         switch (bts.qualifier) {
         case BTS_BRANCH:
-                trace_hw_branch(tr, bts.variant.lbr.from, bts.variant.lbr.to);
+                trace_hw_branch(bts.variant.lbr.from, bts.variant.lbr.to);
                 break;
         }
 }
 
+/*
+ * Collect the trace on the current cpu and write it into the ftrace buffer.
+ *
+ * pre: bts_tracer_lock must be locked
+ */
 static void trace_bts_cpu(void *arg)
 {
         struct trace_array *tr = (struct trace_array *) arg;
         const struct bts_trace *trace;
         unsigned char *at;
 
-        if (!this_tracer)
+        if (unlikely(!tr))
+                return;
+
+        if (unlikely(atomic_read(&tr->data[raw_smp_processor_id()]->disabled)))
+                return;
+
+        if (unlikely(!this_tracer))
                 return;
 
         ds_suspend_bts(this_tracer);
@@ -158,11 +248,11 @@ static void trace_bts_cpu(void *arg)
 
         for (at = trace->ds.top; (void *)at < trace->ds.end;
              at += trace->ds.size)
-                trace_bts_at(tr, trace, at);
+                trace_bts_at(trace, at);
 
         for (at = trace->ds.begin; (void *)at < trace->ds.top;
              at += trace->ds.size)
-                trace_bts_at(tr, trace, at);
+                trace_bts_at(trace, at);
 
 out:
         ds_resume_bts(this_tracer);
@@ -170,26 +260,43 @@ out:
 
 static void trace_bts_prepare(struct trace_iterator *iter)
 {
-        int cpu;
+        spin_lock(&bts_tracer_lock);
+
+        on_each_cpu(trace_bts_cpu, iter->tr, 1);
+
+        spin_unlock(&bts_tracer_lock);
+}
+
+static void trace_bts_close(struct trace_iterator *iter)
+{
+        tracing_reset_online_cpus(iter->tr);
+}
+
+void trace_hw_branch_oops(void)
+{
+        spin_lock(&bts_tracer_lock);
+
+        trace_bts_cpu(hw_branch_trace);
 
-        for_each_cpu(cpu, cpu_possible_mask)
-                smp_call_function_single(cpu, trace_bts_cpu, iter->tr, 1);
+        spin_unlock(&bts_tracer_lock);
 }
 
 struct tracer bts_tracer __read_mostly =
 {
         .name           = "hw-branch-tracer",
         .init           = bts_trace_init,
-        .reset          = bts_trace_stop,
+        .reset          = bts_trace_reset,
         .print_header   = bts_trace_print_header,
         .print_line     = bts_trace_print_line,
         .start          = bts_trace_start,
         .stop           = bts_trace_stop,
-        .open           = trace_bts_prepare
+        .open           = trace_bts_prepare,
+        .close          = trace_bts_close
 };
 
 __init static int init_bts_trace(void)
 {
+        register_hotcpu_notifier(&bts_hotcpu_notifier);
         return register_tracer(&bts_tracer);
 }
 device_initcall(init_bts_trace);
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 62a78d943534..b923d13e2fad 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -1,5 +1,5 @@
 /*
- * trace irqs off criticall timings
+ * trace irqs off critical timings
  *
  * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
  * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
@@ -32,6 +32,8 @@ enum {
 
 static int trace_type __read_mostly;
 
+static int save_lat_flag;
+
 #ifdef CONFIG_PREEMPT_TRACER
 static inline int
 preempt_trace(void)
@@ -95,7 +97,7 @@ irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip)
         disabled = atomic_inc_return(&data->disabled);
 
         if (likely(disabled == 1))
-                trace_function(tr, data, ip, parent_ip, flags, preempt_count());
+                trace_function(tr, ip, parent_ip, flags, preempt_count());
 
         atomic_dec(&data->disabled);
 }
@@ -153,7 +155,7 @@ check_critical_timing(struct trace_array *tr,
         if (!report_latency(delta))
                 goto out_unlock;
 
-        trace_function(tr, data, CALLER_ADDR0, parent_ip, flags, pc);
+        trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc);
 
         latency = nsecs_to_usecs(delta);
 
@@ -177,7 +179,7 @@ out:
         data->critical_sequence = max_sequence;
         data->preempt_timestamp = ftrace_now(cpu);
         tracing_reset(tr, cpu);
-        trace_function(tr, data, CALLER_ADDR0, parent_ip, flags, pc);
+        trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc);
 }
 
 static inline void
@@ -210,7 +212,7 @@ start_critical_timing(unsigned long ip, unsigned long parent_ip)
 
         local_save_flags(flags);
 
-        trace_function(tr, data, ip, parent_ip, flags, preempt_count());
+        trace_function(tr, ip, parent_ip, flags, preempt_count());
 
         per_cpu(tracing_cpu, cpu) = 1;
 
@@ -244,7 +246,7 @@ stop_critical_timing(unsigned long ip, unsigned long parent_ip)
         atomic_inc(&data->disabled);
 
         local_save_flags(flags);
-        trace_function(tr, data, ip, parent_ip, flags, preempt_count());
+        trace_function(tr, ip, parent_ip, flags, preempt_count());
         check_critical_timing(tr, data, parent_ip ? : ip, cpu);
         data->critical_start = 0;
         atomic_dec(&data->disabled);
@@ -353,33 +355,26 @@ void trace_preempt_off(unsigned long a0, unsigned long a1)
 }
 #endif /* CONFIG_PREEMPT_TRACER */
 
-/*
- * save_tracer_enabled is used to save the state of the tracer_enabled
- * variable when we disable it when we open a trace output file.
- */
-static int save_tracer_enabled;
-
 static void start_irqsoff_tracer(struct trace_array *tr)
 {
         register_ftrace_function(&trace_ops);
-        if (tracing_is_enabled()) {
+        if (tracing_is_enabled())
                 tracer_enabled = 1;
-                save_tracer_enabled = 1;
-        } else {
+        else
                 tracer_enabled = 0;
-                save_tracer_enabled = 0;
-        }
 }
 
 static void stop_irqsoff_tracer(struct trace_array *tr)
 {
         tracer_enabled = 0;
-        save_tracer_enabled = 0;
         unregister_ftrace_function(&trace_ops);
 }
 
 static void __irqsoff_tracer_init(struct trace_array *tr)
 {
+        save_lat_flag = trace_flags & TRACE_ITER_LATENCY_FMT;
+        trace_flags |= TRACE_ITER_LATENCY_FMT;
+
         tracing_max_latency = 0;
         irqsoff_trace = tr;
         /* make sure that the tracer is visible */
@@ -390,30 +385,19 @@ static void __irqsoff_tracer_init(struct trace_array *tr)
 static void irqsoff_tracer_reset(struct trace_array *tr)
 {
         stop_irqsoff_tracer(tr);
+
+        if (!save_lat_flag)
+                trace_flags &= ~TRACE_ITER_LATENCY_FMT;
 }
 
 static void irqsoff_tracer_start(struct trace_array *tr)
 {
         tracer_enabled = 1;
-        save_tracer_enabled = 1;
 }
 
 static void irqsoff_tracer_stop(struct trace_array *tr)
 {
         tracer_enabled = 0;
-        save_tracer_enabled = 0;
-}
-
-static void irqsoff_tracer_open(struct trace_iterator *iter)
-{
-        /* stop the trace while dumping */
-        tracer_enabled = 0;
-}
-
-static void irqsoff_tracer_close(struct trace_iterator *iter)
-{
-        /* restart tracing */
-        tracer_enabled = save_tracer_enabled;
 }
 
 #ifdef CONFIG_IRQSOFF_TRACER
@@ -431,8 +415,6 @@ static struct tracer irqsoff_tracer __read_mostly =
         .reset          = irqsoff_tracer_reset,
         .start          = irqsoff_tracer_start,
         .stop           = irqsoff_tracer_stop,
-        .open           = irqsoff_tracer_open,
-        .close          = irqsoff_tracer_close,
         .print_max      = 1,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_irqsoff,
@@ -459,8 +441,6 @@ static struct tracer preemptoff_tracer __read_mostly =
         .reset          = irqsoff_tracer_reset,
         .start          = irqsoff_tracer_start,
         .stop           = irqsoff_tracer_stop,
-        .open           = irqsoff_tracer_open,
-        .close          = irqsoff_tracer_close,
         .print_max      = 1,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_preemptoff,
@@ -489,8 +469,6 @@ static struct tracer preemptirqsoff_tracer __read_mostly =
         .reset          = irqsoff_tracer_reset,
         .start          = irqsoff_tracer_start,
         .stop           = irqsoff_tracer_stop,
-        .open           = irqsoff_tracer_open,
-        .close          = irqsoff_tracer_close,
         .print_max      = 1,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_preemptirqsoff,
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index fffcb069f1dc..8e37fcddd8b4 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -9,8 +9,10 @@
 #include <linux/kernel.h>
 #include <linux/mmiotrace.h>
 #include <linux/pci.h>
+#include <asm/atomic.h>
 
 #include "trace.h"
+#include "trace_output.h"
 
 struct header_iter {
         struct pci_dev *dev;
@@ -19,6 +21,7 @@ struct header_iter {
 static struct trace_array *mmio_trace_array;
 static bool overrun_detected;
 static unsigned long prev_overruns;
+static atomic_t dropped_count;
 
 static void mmio_reset_data(struct trace_array *tr)
 {
@@ -121,11 +124,11 @@ static void mmio_close(struct trace_iterator *iter)
 
 static unsigned long count_overruns(struct trace_iterator *iter)
 {
-        unsigned long cnt = 0;
+        unsigned long cnt = atomic_xchg(&dropped_count, 0);
         unsigned long over = ring_buffer_overruns(iter->tr->buffer);
 
         if (over > prev_overruns)
-                cnt = over - prev_overruns;
+                cnt += over - prev_overruns;
         prev_overruns = over;
         return cnt;
 }
@@ -181,21 +184,22 @@ static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
         switch (rw->opcode) {
         case MMIO_READ:
                 ret = trace_seq_printf(s,
-                        "R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
+                        "R %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
                         rw->width, secs, usec_rem, rw->map_id,
                         (unsigned long long)rw->phys,
                         rw->value, rw->pc, 0);
                 break;
         case MMIO_WRITE:
                 ret = trace_seq_printf(s,
-                        "W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
+                        "W %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
                         rw->width, secs, usec_rem, rw->map_id,
                         (unsigned long long)rw->phys,
                         rw->value, rw->pc, 0);
                 break;
         case MMIO_UNKNOWN_OP:
                 ret = trace_seq_printf(s,
-                        "UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n",
+                        "UNKNOWN %u.%06lu %d 0x%llx %02lx,%02lx,"
+                        "%02lx 0x%lx %d\n",
                         secs, usec_rem, rw->map_id,
                         (unsigned long long)rw->phys,
                         (rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff,
@@ -227,14 +231,14 @@ static enum print_line_t mmio_print_map(struct trace_iterator *iter)
         switch (m->opcode) {
         case MMIO_PROBE:
                 ret = trace_seq_printf(s,
-                        "MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
+                        "MAP %u.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
                         secs, usec_rem, m->map_id,
                         (unsigned long long)m->phys, m->virt, m->len,
                         0UL, 0);
                 break;
         case MMIO_UNPROBE:
                 ret = trace_seq_printf(s,
-                        "UNMAP %lu.%06lu %d 0x%lx %d\n",
+                        "UNMAP %u.%06lu %d 0x%lx %d\n",
                         secs, usec_rem, m->map_id, 0UL, 0);
                 break;
         default:
@@ -253,18 +257,15 @@ static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
         const char *msg         = print->buf;
         struct trace_seq *s     = &iter->seq;
         unsigned long long t    = ns2usecs(iter->ts);
-        unsigned long usec_rem  = do_div(t, 1000000ULL);
+        unsigned long usec_rem  = do_div(t, USEC_PER_SEC);
         unsigned secs           = (unsigned long)t;
         int ret;
 
         /* The trailing newline must be in the message. */
-        ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg);
+        ret = trace_seq_printf(s, "MARK %u.%06lu %s", secs, usec_rem, msg);
         if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
 
-        if (entry->flags & TRACE_FLAG_CONT)
-                trace_seq_print_cont(s, iter);
-
         return TRACE_TYPE_HANDLED;
 }
 
@@ -306,19 +307,17 @@ static void __trace_mmiotrace_rw(struct trace_array *tr,
 {
         struct ring_buffer_event *event;
         struct trace_mmiotrace_rw *entry;
-        unsigned long irq_flags;
+        int pc = preempt_count();
 
-        event   = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-                                           &irq_flags);
-        if (!event)
+        event = trace_buffer_lock_reserve(tr, TRACE_MMIO_RW,
+                                          sizeof(*entry), 0, pc);
+        if (!event) {
+                atomic_inc(&dropped_count);
                 return;
+        }
         entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, 0, preempt_count());
-        entry->ent.type                 = TRACE_MMIO_RW;
         entry->rw                       = *rw;
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
-
-        trace_wake_up();
+        trace_buffer_unlock_commit(tr, event, 0, pc);
 }
 
 void mmio_trace_rw(struct mmiotrace_rw *rw)
@@ -334,19 +333,17 @@ static void __trace_mmiotrace_map(struct trace_array *tr,
 {
         struct ring_buffer_event *event;
         struct trace_mmiotrace_map *entry;
-        unsigned long irq_flags;
+        int pc = preempt_count();
 
-        event   = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-                                           &irq_flags);
-        if (!event)
+        event = trace_buffer_lock_reserve(tr, TRACE_MMIO_MAP,
+                                          sizeof(*entry), 0, pc);
+        if (!event) {
+                atomic_inc(&dropped_count);
                 return;
+        }
         entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, 0, preempt_count());
-        entry->ent.type                 = TRACE_MMIO_MAP;
         entry->map                      = *map;
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
-
-        trace_wake_up();
+        trace_buffer_unlock_commit(tr, event, 0, pc);
 }
 
 void mmio_trace_mapping(struct mmiotrace_map *map)
@@ -362,5 +359,5 @@ void mmio_trace_mapping(struct mmiotrace_map *map)
 
 int mmio_trace_printk(const char *fmt, va_list args)
 {
-        return trace_vprintk(0, -1, fmt, args);
+        return trace_vprintk(0, fmt, args);
 }
diff --git a/kernel/trace/trace_nop.c b/kernel/trace/trace_nop.c
index b9767acd30ac..394f94417e2f 100644
--- a/kernel/trace/trace_nop.c
+++ b/kernel/trace/trace_nop.c
@@ -47,12 +47,7 @@ static void stop_nop_trace(struct trace_array *tr)
 
 static int nop_trace_init(struct trace_array *tr)
 {
-        int cpu;
         ctx_trace = tr;
-
-        for_each_online_cpu(cpu)
-                tracing_reset(tr, cpu);
-
         start_nop_trace(tr);
         return 0;
 }
@@ -96,6 +91,7 @@ struct tracer nop_trace __read_mostly =
         .name           = "nop",
         .init           = nop_trace_init,
         .reset          = nop_trace_reset,
+        .wait_pipe      = poll_wait_pipe,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest       = trace_selftest_startup_nop,
 #endif
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
new file mode 100644
index 000000000000..64b54a59c55b
--- /dev/null
+++ b/kernel/trace/trace_output.c
@@ -0,0 +1,1017 @@
+/*
+ * trace_output.c
+ *
+ * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/ftrace.h>
+
+#include "trace_output.h"
+
+/* must be a power of 2 */
+#define EVENT_HASHSIZE  128
+
+static DEFINE_MUTEX(trace_event_mutex);
+static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
+
+static int next_event_type = __TRACE_LAST_TYPE + 1;
+
+enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
+{
+        struct trace_seq *s = &iter->seq;
+        struct trace_entry *entry = iter->ent;
+        struct bprint_entry *field;
+        int ret;
+
+        trace_assign_type(field, entry);
+
+        ret = trace_seq_bprintf(s, field->fmt, field->buf);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
+{
+        struct trace_seq *s = &iter->seq;
+        struct trace_entry *entry = iter->ent;
+        struct print_entry *field;
+        int ret;
+
+        trace_assign_type(field, entry);
+
+        ret = trace_seq_printf(s, "%s", field->buf);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+/**
+ * trace_seq_printf - sequence printing of trace information
+ * @s: trace sequence descriptor
+ * @fmt: printf format string
+ *
+ * The tracer may use either sequence operations or its own
+ * copy to user routines. To simplify formating of a trace
+ * trace_seq_printf is used to store strings into a special
+ * buffer (@s). Then the output may be either used by
+ * the sequencer or pulled into another buffer.
+ */
+int
+trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
+{
+        int len = (PAGE_SIZE - 1) - s->len;
+        va_list ap;
+        int ret;
+
+        if (!len)
+                return 0;
+
+        va_start(ap, fmt);
+        ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
+        va_end(ap);
+
+        /* If we can't write it all, don't bother writing anything */
+        if (ret >= len)
+                return 0;
+
+        s->len += ret;
+
+        return len;
+}
+
+int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
+{
+        int len = (PAGE_SIZE - 1) - s->len;
+        int ret;
+
+        if (!len)
+                return 0;
+
+        ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
+
+        /* If we can't write it all, don't bother writing anything */
+        if (ret >= len)
+                return 0;
+
+        s->len += ret;
+
+        return len;
+}
+
+/**
+ * trace_seq_puts - trace sequence printing of simple string
+ * @s: trace sequence descriptor
+ * @str: simple string to record
+ *
+ * The tracer may use either the sequence operations or its own
+ * copy to user routines. This function records a simple string
+ * into a special buffer (@s) for later retrieval by a sequencer
+ * or other mechanism.
+ */
+int trace_seq_puts(struct trace_seq *s, const char *str)
+{
+        int len = strlen(str);
+
+        if (len > ((PAGE_SIZE - 1) - s->len))
+                return 0;
+
+        memcpy(s->buffer + s->len, str, len);
+        s->len += len;
+
+        return len;
+}
+
+int trace_seq_putc(struct trace_seq *s, unsigned char c)
+{
+        if (s->len >= (PAGE_SIZE - 1))
+                return 0;
+
+        s->buffer[s->len++] = c;
+
+        return 1;
+}
+
+int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
+{
+        if (len > ((PAGE_SIZE - 1) - s->len))
+                return 0;
+
+        memcpy(s->buffer + s->len, mem, len);
+        s->len += len;
+
+        return len;
+}
+
+int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
+{
+        unsigned char hex[HEX_CHARS];
+        const unsigned char *data = mem;
+        int i, j;
+
+#ifdef __BIG_ENDIAN
+        for (i = 0, j = 0; i < len; i++) {
+#else
+        for (i = len-1, j = 0; i >= 0; i--) {
+#endif
+                hex[j++] = hex_asc_hi(data[i]);
+                hex[j++] = hex_asc_lo(data[i]);
+        }
+        hex[j++] = ' ';
+
+        return trace_seq_putmem(s, hex, j);
+}
+
+void *trace_seq_reserve(struct trace_seq *s, size_t len)
+{
+        void *ret;
+
+        if (len > ((PAGE_SIZE - 1) - s->len))
+                return NULL;
+
+        ret = s->buffer + s->len;
+        s->len += len;
+
+        return ret;
+}
+
+int trace_seq_path(struct trace_seq *s, struct path *path)
+{
+        unsigned char *p;
+
+        if (s->len >= (PAGE_SIZE - 1))
+                return 0;
+        p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
+        if (!IS_ERR(p)) {
+                p = mangle_path(s->buffer + s->len, p, "\n");
+                if (p) {
+                        s->len = p - s->buffer;
+                        return 1;
+                }
+        } else {
+                s->buffer[s->len++] = '?';
+                return 1;
+        }
+
+        return 0;
+}
+
+#ifdef CONFIG_KRETPROBES
+static inline const char *kretprobed(const char *name)
+{
+        static const char tramp_name[] = "kretprobe_trampoline";
+        int size = sizeof(tramp_name);
+
+        if (strncmp(tramp_name, name, size) == 0)
+                return "[unknown/kretprobe'd]";
+        return name;
+}
+#else
+static inline const char *kretprobed(const char *name)
+{
+        return name;
+}
+#endif /* CONFIG_KRETPROBES */
+
+static int
+seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
+{
+#ifdef CONFIG_KALLSYMS
+        char str[KSYM_SYMBOL_LEN];
+        const char *name;
+
+        kallsyms_lookup(address, NULL, NULL, NULL, str);
+
+        name = kretprobed(str);
+
+        return trace_seq_printf(s, fmt, name);
+#endif
+        return 1;
+}
+
+static int
+seq_print_sym_offset(struct trace_seq *s, const char *fmt,
+                     unsigned long address)
+{
+#ifdef CONFIG_KALLSYMS
+        char str[KSYM_SYMBOL_LEN];
+        const char *name;
+
+        sprint_symbol(str, address);
+        name = kretprobed(str);
+
+        return trace_seq_printf(s, fmt, name);
+#endif
+        return 1;
+}
+
+#ifndef CONFIG_64BIT
+# define IP_FMT "%08lx"
+#else
+# define IP_FMT "%016lx"
+#endif
+
+int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
+                      unsigned long ip, unsigned long sym_flags)
+{
+        struct file *file = NULL;
+        unsigned long vmstart = 0;
+        int ret = 1;
+
+        if (mm) {
+                const struct vm_area_struct *vma;
+
+                down_read(&mm->mmap_sem);
+                vma = find_vma(mm, ip);
+                if (vma) {
+                        file = vma->vm_file;
+                        vmstart = vma->vm_start;
+                }
+                if (file) {
+                        ret = trace_seq_path(s, &file->f_path);
+                        if (ret)
+                                ret = trace_seq_printf(s, "[+0x%lx]",
+                                                       ip - vmstart);
+                }
+                up_read(&mm->mmap_sem);
+        }
+        if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
+                ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
+        return ret;
+}
+
+int
+seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
+                      unsigned long sym_flags)
+{
+        struct mm_struct *mm = NULL;
+        int ret = 1;
+        unsigned int i;
+
+        if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
+                struct task_struct *task;
+                /*
+                 * we do the lookup on the thread group leader,
+                 * since individual threads might have already quit!
+                 */
+                rcu_read_lock();
+                task = find_task_by_vpid(entry->ent.tgid);
+                if (task)
+                        mm = get_task_mm(task);
+                rcu_read_unlock();
+        }
+
+        for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
+                unsigned long ip = entry->caller[i];
+
+                if (ip == ULONG_MAX || !ret)
+                        break;
+                if (i && ret)
+                        ret = trace_seq_puts(s, " <- ");
+                if (!ip) {
+                        if (ret)
+                                ret = trace_seq_puts(s, "??");
+                        continue;
+                }
+                if (!ret)
+                        break;
+                if (ret)
+                        ret = seq_print_user_ip(s, mm, ip, sym_flags);
+        }
+
+        if (mm)
+                mmput(mm);
+        return ret;
+}
+
+int
+seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
+{
+        int ret;
+
+        if (!ip)
+                return trace_seq_printf(s, "0");
+
+        if (sym_flags & TRACE_ITER_SYM_OFFSET)
+                ret = seq_print_sym_offset(s, "%s", ip);
+        else
+                ret = seq_print_sym_short(s, "%s", ip);
+
+        if (!ret)
+                return 0;
+
+        if (sym_flags & TRACE_ITER_SYM_ADDR)
+                ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
+        return ret;
+}
+
+static int
+lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
+{
+        int hardirq, softirq;
+        char comm[TASK_COMM_LEN];
+
+        trace_find_cmdline(entry->pid, comm);
+        hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
+        softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
+
+        if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c",
+                              comm, entry->pid, cpu,
+                              (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
+                                (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
+                                  'X' : '.',
+                              (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
+                                'N' : '.',
+                              (hardirq && softirq) ? 'H' :
+                                hardirq ? 'h' : softirq ? 's' : '.'))
+                return 0;
+
+        if (entry->preempt_count)
+                return trace_seq_printf(s, "%x", entry->preempt_count);
+        return trace_seq_puts(s, ".");
+}
+
+static unsigned long preempt_mark_thresh = 100;
+
+static int
+lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
+                    unsigned long rel_usecs)
+{
+        return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
+                                rel_usecs > preempt_mark_thresh ? '!' :
+                                  rel_usecs > 1 ? '+' : ' ');
+}
+
+int trace_print_context(struct trace_iterator *iter)
+{
+        struct trace_seq *s = &iter->seq;
+        struct trace_entry *entry = iter->ent;
+        unsigned long long t = ns2usecs(iter->ts);
+        unsigned long usec_rem = do_div(t, USEC_PER_SEC);
+        unsigned long secs = (unsigned long)t;
+        char comm[TASK_COMM_LEN];
+
+        trace_find_cmdline(entry->pid, comm);
+
+        return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
+                                comm, entry->pid, iter->cpu, secs, usec_rem);
+}
+
+int trace_print_lat_context(struct trace_iterator *iter)
+{
+        u64 next_ts;
+        int ret;
+        struct trace_seq *s = &iter->seq;
+        struct trace_entry *entry = iter->ent,
+                           *next_entry = trace_find_next_entry(iter, NULL,
+                                                               &next_ts);
+        unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
+        unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
+        unsigned long rel_usecs;
+
+        if (!next_entry)
+                next_ts = iter->ts;
+        rel_usecs = ns2usecs(next_ts - iter->ts);
+
+        if (verbose) {
+                char comm[TASK_COMM_LEN];
+
+                trace_find_cmdline(entry->pid, comm);
+
+                ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
+                                       " %ld.%03ldms (+%ld.%03ldms): ", comm,
+                                       entry->pid, iter->cpu, entry->flags,
+                                       entry->preempt_count, iter->idx,
+                                       ns2usecs(iter->ts),
+                                       abs_usecs / USEC_PER_MSEC,
+                                       abs_usecs % USEC_PER_MSEC,
+                                       rel_usecs / USEC_PER_MSEC,
+                                       rel_usecs % USEC_PER_MSEC);
+        } else {
+                ret = lat_print_generic(s, entry, iter->cpu);
+                if (ret)
+                        ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
+        }
+
+        return ret;
+}
+
+static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
+
+static int task_state_char(unsigned long state)
+{
+        int bit = state ? __ffs(state) + 1 : 0;
+
+        return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
+}
+
+/**
+ * ftrace_find_event - find a registered event
+ * @type: the type of event to look for
+ *
+ * Returns an event of type @type otherwise NULL
+ */
+struct trace_event *ftrace_find_event(int type)
+{
+        struct trace_event *event;
+        struct hlist_node *n;
+        unsigned key;
+
+        key = type & (EVENT_HASHSIZE - 1);
+
+        hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
+                if (event->type == type)
+                        return event;
+        }
+
+        return NULL;
+}
+
+/**
+ * register_ftrace_event - register output for an event type
+ * @event: the event type to register
+ *
+ * Event types are stored in a hash and this hash is used to
+ * find a way to print an event. If the @event->type is set
+ * then it will use that type, otherwise it will assign a
+ * type to use.
+ *
+ * If you assign your own type, please make sure it is added
+ * to the trace_type enum in trace.h, to avoid collisions
+ * with the dynamic types.
+ *
+ * Returns the event type number or zero on error.
+ */
+int register_ftrace_event(struct trace_event *event)
+{
+        unsigned key;
+        int ret = 0;
+
+        mutex_lock(&trace_event_mutex);
+
+        if (!event) {
+                ret = next_event_type++;
+                goto out;
+        }
+
+        if (!event->type)
+                event->type = next_event_type++;
+        else if (event->type > __TRACE_LAST_TYPE) {
+                printk(KERN_WARNING "Need to add type to trace.h\n");
+                WARN_ON(1);
+        }
+
+        if (ftrace_find_event(event->type))
+                goto out;
+
+        if (event->trace == NULL)
+                event->trace = trace_nop_print;
+        if (event->raw == NULL)
+                event->raw = trace_nop_print;
+        if (event->hex == NULL)
+                event->hex = trace_nop_print;
+        if (event->binary == NULL)
+                event->binary = trace_nop_print;
+
+        key = event->type & (EVENT_HASHSIZE - 1);
+
+        hlist_add_head_rcu(&event->node, &event_hash[key]);
+
+        ret = event->type;
+ out:
+        mutex_unlock(&trace_event_mutex);
+
+        return ret;
+}
+
+/**
+ * unregister_ftrace_event - remove a no longer used event
+ * @event: the event to remove
+ */
+int unregister_ftrace_event(struct trace_event *event)
+{
+        mutex_lock(&trace_event_mutex);
+        hlist_del(&event->node);
+        mutex_unlock(&trace_event_mutex);
+
+        return 0;
+}
+
+/*
+ * Standard events
+ */
+
+enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
+{
+        return TRACE_TYPE_HANDLED;
+}
+
+/* TRACE_FN */
+static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
+{
+        struct ftrace_entry *field;
+        struct trace_seq *s = &iter->seq;
+
+        trace_assign_type(field, iter->ent);
+
+        if (!seq_print_ip_sym(s, field->ip, flags))
+                goto partial;
+
+        if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
+                if (!trace_seq_printf(s, " <-"))
+                        goto partial;
+                if (!seq_print_ip_sym(s,
+                                      field->parent_ip,
+                                      flags))
+                        goto partial;
+        }
+        if (!trace_seq_printf(s, "\n"))
+                goto partial;
+
+        return TRACE_TYPE_HANDLED;
+
+ partial:
+        return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
+{
+        struct ftrace_entry *field;
+
+        trace_assign_type(field, iter->ent);
+
+        if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
+                              field->ip,
+                              field->parent_ip))
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
+{
+        struct ftrace_entry *field;
+        struct trace_seq *s = &iter->seq;
+
+        trace_assign_type(field, iter->ent);
+
+        SEQ_PUT_HEX_FIELD_RET(s, field->ip);
+        SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
+{
+        struct ftrace_entry *field;
+        struct trace_seq *s = &iter->seq;
+
+        trace_assign_type(field, iter->ent);
+
+        SEQ_PUT_FIELD_RET(s, field->ip);
+        SEQ_PUT_FIELD_RET(s, field->parent_ip);
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static struct trace_event trace_fn_event = {
+        .type           = TRACE_FN,
+        .trace          = trace_fn_trace,
+        .raw            = trace_fn_raw,
+        .hex            = trace_fn_hex,
+        .binary         = trace_fn_bin,
+};
+
+/* TRACE_CTX an TRACE_WAKE */
+static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
+                                             char *delim)
+{
+        struct ctx_switch_entry *field;
+        char comm[TASK_COMM_LEN];
+        int S, T;
+
+
+        trace_assign_type(field, iter->ent);
+
+        T = task_state_char(field->next_state);
+        S = task_state_char(field->prev_state);
+        trace_find_cmdline(field->next_pid, comm);
+        if (!trace_seq_printf(&iter->seq,
+                              " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
+                              field->prev_pid,
+                              field->prev_prio,
+                              S, delim,
+                              field->next_cpu,
+                              field->next_pid,
+                              field->next_prio,
+                              T, comm))
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
+{
+        return trace_ctxwake_print(iter, "==>");
+}
+
+static enum print_line_t trace_wake_print(struct trace_iterator *iter,
+                                          int flags)
+{
+        return trace_ctxwake_print(iter, "  +");
+}
+
+static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
+{
+        struct ctx_switch_entry *field;
+        int T;
+
+        trace_assign_type(field, iter->ent);
+
+        if (!S)
+                task_state_char(field->prev_state);
+        T = task_state_char(field->next_state);
+        if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
+                              field->prev_pid,
+                              field->prev_prio,
+                              S,
+                              field->next_cpu,
+                              field->next_pid,
+                              field->next_prio,
+                              T))
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
+{
+        return trace_ctxwake_raw(iter, 0);
+}
+
+static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
+{
+        return trace_ctxwake_raw(iter, '+');
+}
+
+
+static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
+{
+        struct ctx_switch_entry *field;
+        struct trace_seq *s = &iter->seq;
+        int T;
+
+        trace_assign_type(field, iter->ent);
+
+        if (!S)
+                task_state_char(field->prev_state);
+        T = task_state_char(field->next_state);
+
+        SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
+        SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
+        SEQ_PUT_HEX_FIELD_RET(s, S);
+        SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
+        SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
+        SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
+        SEQ_PUT_HEX_FIELD_RET(s, T);
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
+{
+        return trace_ctxwake_hex(iter, 0);
+}
+
+static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
+{
+        return trace_ctxwake_hex(iter, '+');
+}
+
+static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
+                                           int flags)
+{
+        struct ctx_switch_entry *field;
+        struct trace_seq *s = &iter->seq;
+
+        trace_assign_type(field, iter->ent);
+
+        SEQ_PUT_FIELD_RET(s, field->prev_pid);
+        SEQ_PUT_FIELD_RET(s, field->prev_prio);
+        SEQ_PUT_FIELD_RET(s, field->prev_state);
+        SEQ_PUT_FIELD_RET(s, field->next_pid);
+        SEQ_PUT_FIELD_RET(s, field->next_prio);
+        SEQ_PUT_FIELD_RET(s, field->next_state);
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static struct trace_event trace_ctx_event = {
+        .type           = TRACE_CTX,
+        .trace          = trace_ctx_print,
+        .raw            = trace_ctx_raw,
+        .hex            = trace_ctx_hex,
+        .binary         = trace_ctxwake_bin,
+};
+
+static struct trace_event trace_wake_event = {
+        .type           = TRACE_WAKE,
+        .trace          = trace_wake_print,
+        .raw            = trace_wake_raw,
+        .hex            = trace_wake_hex,
+        .binary         = trace_ctxwake_bin,
+};
+
+/* TRACE_SPECIAL */
+static enum print_line_t trace_special_print(struct trace_iterator *iter,
+                                             int flags)
+{
+        struct special_entry *field;
+
+        trace_assign_type(field, iter->ent);
+
+        if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
+                              field->arg1,
+                              field->arg2,
+                              field->arg3))
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t trace_special_hex(struct trace_iterator *iter,
+                                           int flags)
+{
+        struct special_entry *field;
+        struct trace_seq *s = &iter->seq;
+
+        trace_assign_type(field, iter->ent);
+
+        SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
+        SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
+        SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t trace_special_bin(struct trace_iterator *iter,
+                                           int flags)
+{
+        struct special_entry *field;
+        struct trace_seq *s = &iter->seq;
+
+        trace_assign_type(field, iter->ent);
+
+        SEQ_PUT_FIELD_RET(s, field->arg1);
+        SEQ_PUT_FIELD_RET(s, field->arg2);
+        SEQ_PUT_FIELD_RET(s, field->arg3);
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static struct trace_event trace_special_event = {
+        .type           = TRACE_SPECIAL,
+        .trace          = trace_special_print,
+        .raw            = trace_special_print,
+        .hex            = trace_special_hex,
+        .binary         = trace_special_bin,
+};
+
+/* TRACE_STACK */
+
+static enum print_line_t trace_stack_print(struct trace_iterator *iter,
+                                           int flags)
+{
+        struct stack_entry *field;
+        struct trace_seq *s = &iter->seq;
+        int i;
+
+        trace_assign_type(field, iter->ent);
+
+        for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
+                if (i) {
+                        if (!trace_seq_puts(s, " <= "))
+                                goto partial;
+
+                        if (!seq_print_ip_sym(s, field->caller[i], flags))
+                                goto partial;
+                }
+                if (!trace_seq_puts(s, "\n"))
+                        goto partial;
+        }
+
+        return TRACE_TYPE_HANDLED;
+
+ partial:
+        return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static struct trace_event trace_stack_event = {
+        .type           = TRACE_STACK,
+        .trace          = trace_stack_print,
+        .raw            = trace_special_print,
+        .hex            = trace_special_hex,
+        .binary         = trace_special_bin,
+};
+
+/* TRACE_USER_STACK */
+static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
+                                                int flags)
+{
+        struct userstack_entry *field;
+        struct trace_seq *s = &iter->seq;
+
+        trace_assign_type(field, iter->ent);
+
+        if (!seq_print_userip_objs(field, s, flags))
+                goto partial;
+
+        if (!trace_seq_putc(s, '\n'))
+                goto partial;
+
+        return TRACE_TYPE_HANDLED;
+
+ partial:
+        return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static struct trace_event trace_user_stack_event = {
+        .type           = TRACE_USER_STACK,
+        .trace          = trace_user_stack_print,
+        .raw            = trace_special_print,
+        .hex            = trace_special_hex,
+        .binary         = trace_special_bin,
+};
+
+/* TRACE_BPRINT */
+static enum print_line_t
+trace_bprint_print(struct trace_iterator *iter, int flags)
+{
+        struct trace_entry *entry = iter->ent;
+        struct trace_seq *s = &iter->seq;
+        struct bprint_entry *field;
+
+        trace_assign_type(field, entry);
+
+        if (!seq_print_ip_sym(s, field->ip, flags))
+                goto partial;
+
+        if (!trace_seq_puts(s, ": "))
+                goto partial;
+
+        if (!trace_seq_bprintf(s, field->fmt, field->buf))
+                goto partial;
+
+        return TRACE_TYPE_HANDLED;
+
+ partial:
+        return TRACE_TYPE_PARTIAL_LINE;
+}
+
+
+static enum print_line_t
+trace_bprint_raw(struct trace_iterator *iter, int flags)
+{
+        struct bprint_entry *field;
+        struct trace_seq *s = &iter->seq;
+
+        trace_assign_type(field, iter->ent);
+
+        if (!trace_seq_printf(s, ": %lx : ", field->ip))
+                goto partial;
+
+        if (!trace_seq_bprintf(s, field->fmt, field->buf))
+                goto partial;
+
+        return TRACE_TYPE_HANDLED;
+
+ partial:
+        return TRACE_TYPE_PARTIAL_LINE;
+}
+
+
+static struct trace_event trace_bprint_event = {
+        .type           = TRACE_BPRINT,
+        .trace          = trace_bprint_print,
+        .raw            = trace_bprint_raw,
+};
+
+/* TRACE_PRINT */
+static enum print_line_t trace_print_print(struct trace_iterator *iter,
+                                           int flags)
+{
+        struct print_entry *field;
+        struct trace_seq *s = &iter->seq;
+
+        trace_assign_type(field, iter->ent);
+
+        if (!seq_print_ip_sym(s, field->ip, flags))
+                goto partial;
+
+        if (!trace_seq_printf(s, ": %s", field->buf))
+                goto partial;
+
+        return TRACE_TYPE_HANDLED;
+
+ partial:
+        return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
+{
+        struct print_entry *field;
+
+        trace_assign_type(field, iter->ent);
+
+        if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
+                goto partial;
+
+        return TRACE_TYPE_HANDLED;
+
+ partial:
+        return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static struct trace_event trace_print_event = {
+        .type           = TRACE_PRINT,
+        .trace          = trace_print_print,
+        .raw            = trace_print_raw,
+};
+
+
+static struct trace_event *events[] __initdata = {
+        &trace_fn_event,
+        &trace_ctx_event,
+        &trace_wake_event,
+        &trace_special_event,
+        &trace_stack_event,
+        &trace_user_stack_event,
+        &trace_bprint_event,
+        &trace_print_event,
+        NULL
+};
+
+__init static int init_events(void)
+{
+        struct trace_event *event;
+        int i, ret;
+
+        for (i = 0; events[i]; i++) {
+                event = events[i];
+
+                ret = register_ftrace_event(event);
+                if (!ret) {
+                        printk(KERN_WARNING "event %d failed to register\n",
+                               event->type);
+                        WARN_ON_ONCE(1);
+                }
+        }
+
+        return 0;
+}
+device_initcall(init_events);
diff --git a/kernel/trace/trace_output.h b/kernel/trace/trace_output.h
new file mode 100644
index 000000000000..e0bde39c2dd9
--- /dev/null
+++ b/kernel/trace/trace_output.h
@@ -0,0 +1,71 @@
+#ifndef __TRACE_EVENTS_H
+#define __TRACE_EVENTS_H
+
+#include "trace.h"
+
+typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
+                                              int flags);
+
+struct trace_event {
+        struct hlist_node       node;
+        int                     type;
+        trace_print_func        trace;
+        trace_print_func        raw;
+        trace_print_func        hex;
+        trace_print_func        binary;
+};
+
+extern enum print_line_t
+trace_print_bprintk_msg_only(struct trace_iterator *iter);
+extern enum print_line_t
+trace_print_printk_msg_only(struct trace_iterator *iter);
+
+extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
+        __attribute__ ((format (printf, 2, 3)));
+extern int
+trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
+extern int
+seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
+                unsigned long sym_flags);
+extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
+                                 size_t cnt);
+extern int trace_seq_puts(struct trace_seq *s, const char *str);
+extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
+extern int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len);
+extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
+                                size_t len);
+extern void *trace_seq_reserve(struct trace_seq *s, size_t len);
+extern int trace_seq_path(struct trace_seq *s, struct path *path);
+extern int seq_print_userip_objs(const struct userstack_entry *entry,
+                                 struct trace_seq *s, unsigned long sym_flags);
+extern int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
+                             unsigned long ip, unsigned long sym_flags);
+
+extern int trace_print_context(struct trace_iterator *iter);
+extern int trace_print_lat_context(struct trace_iterator *iter);
+
+extern struct trace_event *ftrace_find_event(int type);
+extern int register_ftrace_event(struct trace_event *event);
+extern int unregister_ftrace_event(struct trace_event *event);
+
+extern enum print_line_t trace_nop_print(struct trace_iterator *iter,
+                                         int flags);
+
+#define MAX_MEMHEX_BYTES        8
+#define HEX_CHARS               (MAX_MEMHEX_BYTES*2 + 1)
+
+#define SEQ_PUT_FIELD_RET(s, x)                         \
+do {                                                    \
+        if (!trace_seq_putmem(s, &(x), sizeof(x)))      \
+                return TRACE_TYPE_PARTIAL_LINE;         \
+} while (0)
+
+#define SEQ_PUT_HEX_FIELD_RET(s, x)                     \
+do {                                                    \
+        BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES);     \
+        if (!trace_seq_putmem_hex(s, &(x), sizeof(x)))  \
+                return TRACE_TYPE_PARTIAL_LINE;         \
+} while (0)
+
+#endif
+
diff --git a/kernel/trace/trace_power.c b/kernel/trace/trace_power.c
index 7bda248daf55..bae791ebcc51 100644
--- a/kernel/trace/trace_power.c
+++ b/kernel/trace/trace_power.c
@@ -11,15 +11,113 @@
 
 #include <linux/init.h>
 #include <linux/debugfs.h>
-#include <linux/ftrace.h>
+#include <trace/power.h>
 #include <linux/kallsyms.h>
 #include <linux/module.h>
 
 #include "trace.h"
+#include "trace_output.h"
 
 static struct trace_array *power_trace;
 static int __read_mostly trace_power_enabled;
 
+static void probe_power_start(struct power_trace *it, unsigned int type,
+                                unsigned int level)
+{
+        if (!trace_power_enabled)
+                return;
+
+        memset(it, 0, sizeof(struct power_trace));
+        it->state = level;
+        it->type = type;
+        it->stamp = ktime_get();
+}
+
+
+static void probe_power_end(struct power_trace *it)
+{
+        struct ring_buffer_event *event;
+        struct trace_power *entry;
+        struct trace_array_cpu *data;
+        struct trace_array *tr = power_trace;
+
+        if (!trace_power_enabled)
+                return;
+
+        preempt_disable();
+        it->end = ktime_get();
+        data = tr->data[smp_processor_id()];
+
+        event = trace_buffer_lock_reserve(tr, TRACE_POWER,
+                                          sizeof(*entry), 0, 0);
+        if (!event)
+                goto out;
+        entry   = ring_buffer_event_data(event);
+        entry->state_data = *it;
+        trace_buffer_unlock_commit(tr, event, 0, 0);
+ out:
+        preempt_enable();
+}
+
+static void probe_power_mark(struct power_trace *it, unsigned int type,
+                                unsigned int level)
+{
+        struct ring_buffer_event *event;
+        struct trace_power *entry;
+        struct trace_array_cpu *data;
+        struct trace_array *tr = power_trace;
+
+        if (!trace_power_enabled)
+                return;
+
+        memset(it, 0, sizeof(struct power_trace));
+        it->state = level;
+        it->type = type;
+        it->stamp = ktime_get();
+        preempt_disable();
+        it->end = it->stamp;
+        data = tr->data[smp_processor_id()];
+
+        event = trace_buffer_lock_reserve(tr, TRACE_POWER,
+                                          sizeof(*entry), 0, 0);
+        if (!event)
+                goto out;
+        entry   = ring_buffer_event_data(event);
+        entry->state_data = *it;
+        trace_buffer_unlock_commit(tr, event, 0, 0);
+ out:
+        preempt_enable();
+}
+
+static int tracing_power_register(void)
+{
+        int ret;
+
+        ret = register_trace_power_start(probe_power_start);
+        if (ret) {
+                pr_info("power trace: Couldn't activate tracepoint"
+                        " probe to trace_power_start\n");
+                return ret;
+        }
+        ret = register_trace_power_end(probe_power_end);
+        if (ret) {
+                pr_info("power trace: Couldn't activate tracepoint"
+                        " probe to trace_power_end\n");
+                goto fail_start;
+        }
+        ret = register_trace_power_mark(probe_power_mark);
+        if (ret) {
+                pr_info("power trace: Couldn't activate tracepoint"
+                        " probe to trace_power_mark\n");
+                goto fail_end;
+        }
+        return ret;
+fail_end:
+        unregister_trace_power_end(probe_power_end);
+fail_start:
+        unregister_trace_power_start(probe_power_start);
+        return ret;
+}
 
 static void start_power_trace(struct trace_array *tr)
 {
@@ -31,6 +129,14 @@ static void stop_power_trace(struct trace_array *tr)
         trace_power_enabled = 0;
 }
 
+static void power_trace_reset(struct trace_array *tr)
+{
+        trace_power_enabled = 0;
+        unregister_trace_power_start(probe_power_start);
+        unregister_trace_power_end(probe_power_end);
+        unregister_trace_power_mark(probe_power_mark);
+}
+
 
 static int power_trace_init(struct trace_array *tr)
 {
@@ -38,6 +144,7 @@ static int power_trace_init(struct trace_array *tr)
         power_trace = tr;
 
         trace_power_enabled = 1;
+        tracing_power_register();
 
         for_each_cpu(cpu, cpu_possible_mask)
                 tracing_reset(tr, cpu);
@@ -85,7 +192,7 @@ static struct tracer power_tracer __read_mostly =
         .init           = power_trace_init,
         .start          = start_power_trace,
         .stop           = stop_power_trace,
-        .reset          = stop_power_trace,
+        .reset          = power_trace_reset,
         .print_line     = power_print_line,
 };
 
@@ -94,86 +201,3 @@ static int init_power_trace(void)
         return register_tracer(&power_tracer);
 }
 device_initcall(init_power_trace);
-
-void trace_power_start(struct power_trace *it, unsigned int type,
-                         unsigned int level)
-{
-        if (!trace_power_enabled)
-                return;
-
-        memset(it, 0, sizeof(struct power_trace));
-        it->state = level;
-        it->type = type;
-        it->stamp = ktime_get();
-}
-EXPORT_SYMBOL_GPL(trace_power_start);
-
-
-void trace_power_end(struct power_trace *it)
-{
-        struct ring_buffer_event *event;
-        struct trace_power *entry;
-        struct trace_array_cpu *data;
-        unsigned long irq_flags;
-        struct trace_array *tr = power_trace;
-
-        if (!trace_power_enabled)
-                return;
-
-        preempt_disable();
-        it->end = ktime_get();
-        data = tr->data[smp_processor_id()];
-
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-                                         &irq_flags);
-        if (!event)
-                goto out;
-        entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, 0, 0);
-        entry->ent.type = TRACE_POWER;
-        entry->state_data = *it;
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
-
-        trace_wake_up();
-
- out:
-        preempt_enable();
-}
-EXPORT_SYMBOL_GPL(trace_power_end);
-
-void trace_power_mark(struct power_trace *it, unsigned int type,
-                         unsigned int level)
-{
-        struct ring_buffer_event *event;
-        struct trace_power *entry;
-        struct trace_array_cpu *data;
-        unsigned long irq_flags;
-        struct trace_array *tr = power_trace;
-
-        if (!trace_power_enabled)
-                return;
-
-        memset(it, 0, sizeof(struct power_trace));
-        it->state = level;
-        it->type = type;
-        it->stamp = ktime_get();
-        preempt_disable();
-        it->end = it->stamp;
-        data = tr->data[smp_processor_id()];
-
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-                                         &irq_flags);
-        if (!event)
-                goto out;
-        entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, 0, 0);
-        entry->ent.type = TRACE_POWER;
-        entry->state_data = *it;
-        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
-
-        trace_wake_up();
-
- out:
-        preempt_enable();
-}
-EXPORT_SYMBOL_GPL(trace_power_mark);
diff --git a/kernel/trace/trace_printk.c b/kernel/trace/trace_printk.c
new file mode 100644
index 000000000000..eb81556107fe
--- /dev/null
+++ b/kernel/trace/trace_printk.c
@@ -0,0 +1,270 @@
+/*
+ * trace binary printk
+ *
+ * Copyright (C) 2008 Lai Jiangshan <laijs@cn.fujitsu.com>
+ *
+ */
+#include <linux/seq_file.h>
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/kernel.h>
+#include <linux/ftrace.h>
+#include <linux/string.h>
+#include <linux/module.h>
+#include <linux/marker.h>
+#include <linux/mutex.h>
+#include <linux/ctype.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+
+#include "trace.h"
+
+#ifdef CONFIG_MODULES
+
+/*
+ * modules trace_printk()'s formats are autosaved in struct trace_bprintk_fmt
+ * which are queued on trace_bprintk_fmt_list.
+ */
+static LIST_HEAD(trace_bprintk_fmt_list);
+
+/* serialize accesses to trace_bprintk_fmt_list */
+static DEFINE_MUTEX(btrace_mutex);
+
+struct trace_bprintk_fmt {
+        struct list_head list;
+        char fmt[0];
+};
+
+static inline struct trace_bprintk_fmt *lookup_format(const char *fmt)
+{
+        struct trace_bprintk_fmt *pos;
+        list_for_each_entry(pos, &trace_bprintk_fmt_list, list) {
+                if (!strcmp(pos->fmt, fmt))
+                        return pos;
+        }
+        return NULL;
+}
+
+static
+void hold_module_trace_bprintk_format(const char **start, const char **end)
+{
+        const char **iter;
+
+        mutex_lock(&btrace_mutex);
+        for (iter = start; iter < end; iter++) {
+                struct trace_bprintk_fmt *tb_fmt = lookup_format(*iter);
+                if (tb_fmt) {
+                        *iter = tb_fmt->fmt;
+                        continue;
+                }
+
+                tb_fmt = kmalloc(offsetof(struct trace_bprintk_fmt, fmt)
+                                + strlen(*iter) + 1, GFP_KERNEL);
+                if (tb_fmt) {
+                        list_add_tail(&tb_fmt->list, &trace_bprintk_fmt_list);
+                        strcpy(tb_fmt->fmt, *iter);
+                        *iter = tb_fmt->fmt;
+                } else
+                        *iter = NULL;
+        }
+        mutex_unlock(&btrace_mutex);
+}
+
+static int module_trace_bprintk_format_notify(struct notifier_block *self,
+                unsigned long val, void *data)
+{
+        struct module *mod = data;
+        if (mod->num_trace_bprintk_fmt) {
+                const char **start = mod->trace_bprintk_fmt_start;
+                const char **end = start + mod->num_trace_bprintk_fmt;
+
+                if (val == MODULE_STATE_COMING)
+                        hold_module_trace_bprintk_format(start, end);
+        }
+        return 0;
+}
+
+#else /* !CONFIG_MODULES */
+__init static int
+module_trace_bprintk_format_notify(struct notifier_block *self,
+                unsigned long val, void *data)
+{
+        return 0;
+}
+#endif /* CONFIG_MODULES */
+
+
+__initdata_or_module static
+struct notifier_block module_trace_bprintk_format_nb = {
+        .notifier_call = module_trace_bprintk_format_notify,
+};
+
+int __trace_bprintk(unsigned long ip, const char *fmt, ...)
+ {
+        int ret;
+        va_list ap;
+
+        if (unlikely(!fmt))
+                return 0;
+
+        if (!(trace_flags & TRACE_ITER_PRINTK))
+                return 0;
+
+        va_start(ap, fmt);
+        ret = trace_vbprintk(ip, fmt, ap);
+        va_end(ap);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(__trace_bprintk);
+
+int __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap)
+ {
+        if (unlikely(!fmt))
+                return 0;
+
+        if (!(trace_flags & TRACE_ITER_PRINTK))
+                return 0;
+
+        return trace_vbprintk(ip, fmt, ap);
+}
+EXPORT_SYMBOL_GPL(__ftrace_vbprintk);
+
+int __trace_printk(unsigned long ip, const char *fmt, ...)
+{
+        int ret;
+        va_list ap;
+
+        if (!(trace_flags & TRACE_ITER_PRINTK))
+                return 0;
+
+        va_start(ap, fmt);
+        ret = trace_vprintk(ip, fmt, ap);
+        va_end(ap);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(__trace_printk);
+
+int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap)
+{
+        if (!(trace_flags & TRACE_ITER_PRINTK))
+                return 0;
+
+        return trace_vprintk(ip, fmt, ap);
+}
+EXPORT_SYMBOL_GPL(__ftrace_vprintk);
+
+static void *
+t_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        const char **fmt = m->private;
+        const char **next = fmt;
+
+        (*pos)++;
+
+        if ((unsigned long)fmt >= (unsigned long)__stop___trace_bprintk_fmt)
+                return NULL;
+
+        next = fmt;
+        m->private = ++next;
+
+        return fmt;
+}
+
+static void *t_start(struct seq_file *m, loff_t *pos)
+{
+        return t_next(m, NULL, pos);
+}
+
+static int t_show(struct seq_file *m, void *v)
+{
+        const char **fmt = v;
+        const char *str = *fmt;
+        int i;
+
+        seq_printf(m, "0x%lx : \"", (unsigned long)fmt);
+
+        /*
+         * Tabs and new lines need to be converted.
+         */
+        for (i = 0; str[i]; i++) {
+                switch (str[i]) {
+                case '\n':
+                        seq_puts(m, "\\n");
+                        break;
+                case '\t':
+                        seq_puts(m, "\\t");
+                        break;
+                case '\\':
+                        seq_puts(m, "\\");
+                        break;
+                case '"':
+                        seq_puts(m, "\\\"");
+                        break;
+                default:
+                        seq_putc(m, str[i]);
+                }
+        }
+        seq_puts(m, "\"\n");
+
+        return 0;
+}
+
+static void t_stop(struct seq_file *m, void *p)
+{
+}
+
+static const struct seq_operations show_format_seq_ops = {
+        .start = t_start,
+        .next = t_next,
+        .show = t_show,
+        .stop = t_stop,
+};
+
+static int
+ftrace_formats_open(struct inode *inode, struct file *file)
+{
+        int ret;
+
+        ret = seq_open(file, &show_format_seq_ops);
+        if (!ret) {
+                struct seq_file *m = file->private_data;
+
+                m->private = __start___trace_bprintk_fmt;
+        }
+        return ret;
+}
+
+static const struct file_operations ftrace_formats_fops = {
+        .open = ftrace_formats_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = seq_release,
+};
+
+static __init int init_trace_printk_function_export(void)
+{
+        struct dentry *d_tracer;
+        struct dentry *entry;
+
+        d_tracer = tracing_init_dentry();
+        if (!d_tracer)
+                return 0;
+
+        entry = debugfs_create_file("printk_formats", 0444, d_tracer,
+                                    NULL, &ftrace_formats_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs "
+                           "'printk_formats' entry\n");
+
+        return 0;
+}
+
+fs_initcall(init_trace_printk_function_export);
+
+static __init int init_trace_printk(void)
+{
+        return register_module_notifier(&module_trace_bprintk_format_nb);
+}
+
+early_initcall(init_trace_printk);
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index df175cb4564f..9117cea6f1ae 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -18,6 +18,7 @@ static struct trace_array	*ctx_trace;
 static int __read_mostly        tracer_enabled;
 static int                      sched_ref;
 static DEFINE_MUTEX(sched_register_mutex);
+static int                      sched_stopped;
 
 static void
 probe_sched_switch(struct rq *__rq, struct task_struct *prev,
@@ -28,7 +29,7 @@ probe_sched_switch(struct rq *__rq, struct task_struct *prev,
         int cpu;
         int pc;
 
-        if (!sched_ref)
+        if (!sched_ref || sched_stopped)
                 return;
 
         tracing_record_cmdline(prev);
@@ -43,7 +44,7 @@ probe_sched_switch(struct rq *__rq, struct task_struct *prev,
         data = ctx_trace->data[cpu];
 
         if (likely(!atomic_read(&data->disabled)))
-                tracing_sched_switch_trace(ctx_trace, data, prev, next, flags, pc);
+                tracing_sched_switch_trace(ctx_trace, prev, next, flags, pc);
 
         local_irq_restore(flags);
 }
@@ -61,12 +62,15 @@ probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee, int success)
         pc = preempt_count();
         tracing_record_cmdline(current);
 
+        if (sched_stopped)
+                return;
+
         local_irq_save(flags);
         cpu = raw_smp_processor_id();
         data = ctx_trace->data[cpu];
 
         if (likely(!atomic_read(&data->disabled)))
-                tracing_sched_wakeup_trace(ctx_trace, data, wakee, current,
+                tracing_sched_wakeup_trace(ctx_trace, wakee, current,
                                            flags, pc);
 
         local_irq_restore(flags);
@@ -93,7 +97,7 @@ static int tracing_sched_register(void)
         ret = register_trace_sched_switch(probe_sched_switch);
         if (ret) {
                 pr_info("sched trace: Couldn't activate tracepoint"
-                        " probe to kernel_sched_schedule\n");
+                        " probe to kernel_sched_switch\n");
                 goto fail_deprobe_wake_new;
         }
 
@@ -185,12 +189,6 @@ void tracing_sched_switch_assign_trace(struct trace_array *tr)
         ctx_trace = tr;
 }
 
-static void start_sched_trace(struct trace_array *tr)
-{
-        tracing_reset_online_cpus(tr);
-        tracing_start_sched_switch_record();
-}
-
 static void stop_sched_trace(struct trace_array *tr)
 {
         tracing_stop_sched_switch_record();
@@ -199,7 +197,8 @@ static void stop_sched_trace(struct trace_array *tr)
 static int sched_switch_trace_init(struct trace_array *tr)
 {
         ctx_trace = tr;
-        start_sched_trace(tr);
+        tracing_reset_online_cpus(tr);
+        tracing_start_sched_switch_record();
         return 0;
 }
 
@@ -211,13 +210,12 @@ static void sched_switch_trace_reset(struct trace_array *tr)
 
 static void sched_switch_trace_start(struct trace_array *tr)
 {
-        tracing_reset_online_cpus(tr);
-        tracing_start_sched_switch();
+        sched_stopped = 0;
 }
 
 static void sched_switch_trace_stop(struct trace_array *tr)
 {
-        tracing_stop_sched_switch();
+        sched_stopped = 1;
 }
 
 static struct tracer sched_switch_trace __read_mostly =
@@ -227,6 +225,7 @@ static struct tracer sched_switch_trace __read_mostly =
         .reset          = sched_switch_trace_reset,
         .start          = sched_switch_trace_start,
         .stop           = sched_switch_trace_stop,
+        .wait_pipe      = poll_wait_pipe,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_sched_switch,
 #endif
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 42ae1e77b6b3..5bc00e8f153e 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -25,12 +25,15 @@ static int __read_mostly	tracer_enabled;
 static struct task_struct       *wakeup_task;
 static int                      wakeup_cpu;
 static unsigned                 wakeup_prio = -1;
+static int                      wakeup_rt;
 
 static raw_spinlock_t wakeup_lock =
         (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
 
 static void __wakeup_reset(struct trace_array *tr);
 
+static int save_lat_flag;
+
 #ifdef CONFIG_FUNCTION_TRACER
 /*
  * irqsoff uses its own tracer function to keep the overhead down:
@@ -71,7 +74,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
         if (task_cpu(wakeup_task) != cpu)
                 goto unlock;
 
-        trace_function(tr, data, ip, parent_ip, flags, pc);
+        trace_function(tr, ip, parent_ip, flags, pc);
 
  unlock:
         __raw_spin_unlock(&wakeup_lock);
@@ -151,7 +154,8 @@ probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
         if (unlikely(!tracer_enabled || next != wakeup_task))
                 goto out_unlock;
 
-        trace_function(wakeup_trace, data, CALLER_ADDR1, CALLER_ADDR2, flags, pc);
+        trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc);
+        tracing_sched_switch_trace(wakeup_trace, prev, next, flags, pc);
 
         /*
          * usecs conversion is slow so we try to delay the conversion
@@ -182,13 +186,10 @@ out:
 
 static void __wakeup_reset(struct trace_array *tr)
 {
-        struct trace_array_cpu *data;
         int cpu;
 
-        for_each_possible_cpu(cpu) {
-                data = tr->data[cpu];
+        for_each_possible_cpu(cpu)
                 tracing_reset(tr, cpu);
-        }
 
         wakeup_cpu = -1;
         wakeup_prio = -1;
@@ -213,6 +214,7 @@ static void wakeup_reset(struct trace_array *tr)
 static void
 probe_wakeup(struct rq *rq, struct task_struct *p, int success)
 {
+        struct trace_array_cpu *data;
         int cpu = smp_processor_id();
         unsigned long flags;
         long disabled;
@@ -224,7 +226,7 @@ probe_wakeup(struct rq *rq, struct task_struct *p, int success)
         tracing_record_cmdline(p);
         tracing_record_cmdline(current);
 
-        if (likely(!rt_task(p)) ||
+        if ((wakeup_rt && !rt_task(p)) ||
                         p->prio >= wakeup_prio ||
                         p->prio >= current->prio)
                 return;
@@ -252,9 +254,16 @@ probe_wakeup(struct rq *rq, struct task_struct *p, int success)
 
         local_save_flags(flags);
 
-        wakeup_trace->data[wakeup_cpu]->preempt_timestamp = ftrace_now(cpu);
-        trace_function(wakeup_trace, wakeup_trace->data[wakeup_cpu],
-                       CALLER_ADDR1, CALLER_ADDR2, flags, pc);
+        data = wakeup_trace->data[wakeup_cpu];
+        data->preempt_timestamp = ftrace_now(cpu);
+        tracing_sched_wakeup_trace(wakeup_trace, p, current, flags, pc);
+
+        /*
+         * We must be careful in using CALLER_ADDR2. But since wake_up
+         * is not called by an assembly function  (where as schedule is)
+         * it should be safe to use it here.
+         */
+        trace_function(wakeup_trace, CALLER_ADDR1, CALLER_ADDR2, flags, pc);
 
 out_locked:
         __raw_spin_unlock(&wakeup_lock);
@@ -262,12 +271,6 @@ out:
         atomic_dec(&wakeup_trace->data[cpu]->disabled);
 }
 
-/*
- * save_tracer_enabled is used to save the state of the tracer_enabled
- * variable when we disable it when we open a trace output file.
- */
-static int save_tracer_enabled;
-
 static void start_wakeup_tracer(struct trace_array *tr)
 {
         int ret;
@@ -289,7 +292,7 @@ static void start_wakeup_tracer(struct trace_array *tr)
         ret = register_trace_sched_switch(probe_wakeup_sched_switch);
         if (ret) {
                 pr_info("sched trace: Couldn't activate tracepoint"
-                        " probe to kernel_sched_schedule\n");
+                        " probe to kernel_sched_switch\n");
                 goto fail_deprobe_wake_new;
         }
 
@@ -306,13 +309,10 @@ static void start_wakeup_tracer(struct trace_array *tr)
 
         register_ftrace_function(&trace_ops);
 
-        if (tracing_is_enabled()) {
+        if (tracing_is_enabled())
                 tracer_enabled = 1;
-                save_tracer_enabled = 1;
-        } else {
+        else
                 tracer_enabled = 0;
-                save_tracer_enabled = 0;
-        }
 
         return;
 fail_deprobe_wake_new:
@@ -324,54 +324,54 @@ fail_deprobe:
 static void stop_wakeup_tracer(struct trace_array *tr)
 {
         tracer_enabled = 0;
-        save_tracer_enabled = 0;
         unregister_ftrace_function(&trace_ops);
         unregister_trace_sched_switch(probe_wakeup_sched_switch);
         unregister_trace_sched_wakeup_new(probe_wakeup);
         unregister_trace_sched_wakeup(probe_wakeup);
 }
 
-static int wakeup_tracer_init(struct trace_array *tr)
+static int __wakeup_tracer_init(struct trace_array *tr)
 {
+        save_lat_flag = trace_flags & TRACE_ITER_LATENCY_FMT;
+        trace_flags |= TRACE_ITER_LATENCY_FMT;
+
         tracing_max_latency = 0;
         wakeup_trace = tr;
         start_wakeup_tracer(tr);
         return 0;
 }
 
+static int wakeup_tracer_init(struct trace_array *tr)
+{
+        wakeup_rt = 0;
+        return __wakeup_tracer_init(tr);
+}
+
+static int wakeup_rt_tracer_init(struct trace_array *tr)
+{
+        wakeup_rt = 1;
+        return __wakeup_tracer_init(tr);
+}
+
 static void wakeup_tracer_reset(struct trace_array *tr)
 {
         stop_wakeup_tracer(tr);
         /* make sure we put back any tasks we are tracing */
         wakeup_reset(tr);
+
+        if (!save_lat_flag)
+                trace_flags &= ~TRACE_ITER_LATENCY_FMT;
 }
 
 static void wakeup_tracer_start(struct trace_array *tr)
 {
         wakeup_reset(tr);
         tracer_enabled = 1;
-        save_tracer_enabled = 1;
 }
 
 static void wakeup_tracer_stop(struct trace_array *tr)
 {
         tracer_enabled = 0;
-        save_tracer_enabled = 0;
-}
-
-static void wakeup_tracer_open(struct trace_iterator *iter)
-{
-        /* stop the trace while dumping */
-        tracer_enabled = 0;
-}
-
-static void wakeup_tracer_close(struct trace_iterator *iter)
-{
-        /* forget about any processes we were recording */
-        if (save_tracer_enabled) {
-                wakeup_reset(iter->tr);
-                tracer_enabled = 1;
-        }
 }
 
 static struct tracer wakeup_tracer __read_mostly =
@@ -381,8 +381,20 @@ static struct tracer wakeup_tracer __read_mostly =
         .reset          = wakeup_tracer_reset,
         .start          = wakeup_tracer_start,
         .stop           = wakeup_tracer_stop,
-        .open           = wakeup_tracer_open,
-        .close          = wakeup_tracer_close,
+        .print_max      = 1,
+#ifdef CONFIG_FTRACE_SELFTEST
+        .selftest    = trace_selftest_startup_wakeup,
+#endif
+};
+
+static struct tracer wakeup_rt_tracer __read_mostly =
+{
+        .name           = "wakeup_rt",
+        .init           = wakeup_rt_tracer_init,
+        .reset          = wakeup_tracer_reset,
+        .start          = wakeup_tracer_start,
+        .stop           = wakeup_tracer_stop,
+        .wait_pipe      = poll_wait_pipe,
         .print_max      = 1,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_wakeup,
@@ -397,6 +409,10 @@ __init static int init_wakeup_tracer(void)
         if (ret)
                 return ret;
 
+        ret = register_tracer(&wakeup_rt_tracer);
+        if (ret)
+                return ret;
+
         return 0;
 }
 device_initcall(init_wakeup_tracer);
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 88c8eb70f54a..08f4eb2763d1 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -1,5 +1,6 @@
 /* Include in trace.c */
 
+#include <linux/stringify.h>
 #include <linux/kthread.h>
 #include <linux/delay.h>
 
@@ -9,11 +10,12 @@ static inline int trace_valid_entry(struct trace_entry *entry)
         case TRACE_FN:
         case TRACE_CTX:
         case TRACE_WAKE:
-        case TRACE_CONT:
         case TRACE_STACK:
         case TRACE_PRINT:
         case TRACE_SPECIAL:
         case TRACE_BRANCH:
+        case TRACE_GRAPH_ENT:
+        case TRACE_GRAPH_RET:
                 return 1;
         }
         return 0;
@@ -23,10 +25,20 @@ static int trace_test_buffer_cpu(struct trace_array *tr, int cpu)
 {
         struct ring_buffer_event *event;
         struct trace_entry *entry;
+        unsigned int loops = 0;
 
         while ((event = ring_buffer_consume(tr->buffer, cpu, NULL))) {
                 entry = ring_buffer_event_data(event);
 
+                /*
+                 * The ring buffer is a size of trace_buf_size, if
+                 * we loop more than the size, there's something wrong
+                 * with the ring buffer.
+                 */
+                if (loops++ > trace_buf_size) {
+                        printk(KERN_CONT ".. bad ring buffer ");
+                        goto failed;
+                }
                 if (!trace_valid_entry(entry)) {
                         printk(KERN_CONT ".. invalid entry %d ",
                                 entry->type);
@@ -57,11 +69,20 @@ static int trace_test_buffer(struct trace_array *tr, unsigned long *count)
 
         cnt = ring_buffer_entries(tr->buffer);
 
+        /*
+         * The trace_test_buffer_cpu runs a while loop to consume all data.
+         * If the calling tracer is broken, and is constantly filling
+         * the buffer, this will run forever, and hard lock the box.
+         * We disable the ring buffer while we do this test to prevent
+         * a hard lock up.
+         */
+        tracing_off();
         for_each_possible_cpu(cpu) {
                 ret = trace_test_buffer_cpu(tr, cpu);
                 if (ret)
                         break;
         }
+        tracing_on();
         __raw_spin_unlock(&ftrace_max_lock);
         local_irq_restore(flags);
 
@@ -80,9 +101,6 @@ static inline void warn_failed_init_tracer(struct tracer *trace, int init_ret)
 
 #ifdef CONFIG_DYNAMIC_FTRACE
 
-#define __STR(x) #x
-#define STR(x) __STR(x)
-
 /* Test dynamic code modification and ftrace filters */
 int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
                                            struct trace_array *tr,
@@ -106,17 +124,17 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
         func();
 
         /*
-         * Some archs *cough*PowerPC*cough* add charachters to the
+         * Some archs *cough*PowerPC*cough* add characters to the
          * start of the function names. We simply put a '*' to
-         * accomodate them.
+         * accommodate them.
          */
-        func_name = "*" STR(DYN_FTRACE_TEST_NAME);
+        func_name = "*" __stringify(DYN_FTRACE_TEST_NAME);
 
         /* filter only on our function */
         ftrace_set_filter(func_name, strlen(func_name), 1);
 
         /* enable tracing */
-        ret = trace->init(tr);
+        ret = tracer_init(trace, tr);
         if (ret) {
                 warn_failed_init_tracer(trace, ret);
                 goto out;
@@ -190,7 +208,7 @@ trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
         ftrace_enabled = 1;
         tracer_enabled = 1;
 
-        ret = trace->init(tr);
+        ret = tracer_init(trace, tr);
         if (ret) {
                 warn_failed_init_tracer(trace, ret);
                 goto out;
@@ -228,6 +246,90 @@ trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
 }
 #endif /* CONFIG_FUNCTION_TRACER */
 
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+
+/* Maximum number of functions to trace before diagnosing a hang */
+#define GRAPH_MAX_FUNC_TEST     100000000
+
+static void __ftrace_dump(bool disable_tracing);
+static unsigned int graph_hang_thresh;
+
+/* Wrap the real function entry probe to avoid possible hanging */
+static int trace_graph_entry_watchdog(struct ftrace_graph_ent *trace)
+{
+        /* This is harmlessly racy, we want to approximately detect a hang */
+        if (unlikely(++graph_hang_thresh > GRAPH_MAX_FUNC_TEST)) {
+                ftrace_graph_stop();
+                printk(KERN_WARNING "BUG: Function graph tracer hang!\n");
+                if (ftrace_dump_on_oops)
+                        __ftrace_dump(false);
+                return 0;
+        }
+
+        return trace_graph_entry(trace);
+}
+
+/*
+ * Pretty much the same than for the function tracer from which the selftest
+ * has been borrowed.
+ */
+int
+trace_selftest_startup_function_graph(struct tracer *trace,
+                                        struct trace_array *tr)
+{
+        int ret;
+        unsigned long count;
+
+        /*
+         * Simulate the init() callback but we attach a watchdog callback
+         * to detect and recover from possible hangs
+         */
+        tracing_reset_online_cpus(tr);
+        ret = register_ftrace_graph(&trace_graph_return,
+                                    &trace_graph_entry_watchdog);
+        if (ret) {
+                warn_failed_init_tracer(trace, ret);
+                goto out;
+        }
+        tracing_start_cmdline_record();
+
+        /* Sleep for a 1/10 of a second */
+        msleep(100);
+
+        /* Have we just recovered from a hang? */
+        if (graph_hang_thresh > GRAPH_MAX_FUNC_TEST) {
+                tracing_selftest_disabled = true;
+                ret = -1;
+                goto out;
+        }
+
+        tracing_stop();
+
+        /* check the trace buffer */
+        ret = trace_test_buffer(tr, &count);
+
+        trace->reset(tr);
+        tracing_start();
+
+        if (!ret && !count) {
+                printk(KERN_CONT ".. no entries found ..");
+                ret = -1;
+                goto out;
+        }
+
+        /* Don't test dynamic tracing, the function tracer already did */
+
+out:
+        /* Stop it if we failed */
+        if (ret)
+                ftrace_graph_stop();
+
+        return ret;
+}
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
+
 #ifdef CONFIG_IRQSOFF_TRACER
 int
 trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr)
@@ -237,7 +339,7 @@ trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr)
         int ret;
 
         /* start the tracing */
-        ret = trace->init(tr);
+        ret = tracer_init(trace, tr);
         if (ret) {
                 warn_failed_init_tracer(trace, ret);
                 return ret;
@@ -249,6 +351,14 @@ trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr)
         local_irq_disable();
         udelay(100);
         local_irq_enable();
+
+        /*
+         * Stop the tracer to avoid a warning subsequent
+         * to buffer flipping failure because tracing_stop()
+         * disables the tr and max buffers, making flipping impossible
+         * in case of parallels max irqs off latencies.
+         */
+        trace->stop(tr);
         /* stop the tracing. */
         tracing_stop();
         /* check both trace buffers */
@@ -291,7 +401,7 @@ trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr)
         }
 
         /* start the tracing */
-        ret = trace->init(tr);
+        ret = tracer_init(trace, tr);
         if (ret) {
                 warn_failed_init_tracer(trace, ret);
                 return ret;
@@ -303,6 +413,14 @@ trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr)
         preempt_disable();
         udelay(100);
         preempt_enable();
+
+        /*
+         * Stop the tracer to avoid a warning subsequent
+         * to buffer flipping failure because tracing_stop()
+         * disables the tr and max buffers, making flipping impossible
+         * in case of parallels max preempt off latencies.
+         */
+        trace->stop(tr);
         /* stop the tracing. */
         tracing_stop();
         /* check both trace buffers */
@@ -345,10 +463,10 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
         }
 
         /* start the tracing */
-        ret = trace->init(tr);
+        ret = tracer_init(trace, tr);
         if (ret) {
                 warn_failed_init_tracer(trace, ret);
-                goto out;
+                goto out_no_start;
         }
 
         /* reset the max latency */
@@ -362,31 +480,35 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
         /* reverse the order of preempt vs irqs */
         local_irq_enable();
 
+        /*
+         * Stop the tracer to avoid a warning subsequent
+         * to buffer flipping failure because tracing_stop()
+         * disables the tr and max buffers, making flipping impossible
+         * in case of parallels max irqs/preempt off latencies.
+         */
+        trace->stop(tr);
         /* stop the tracing. */
         tracing_stop();
         /* check both trace buffers */
         ret = trace_test_buffer(tr, NULL);
-        if (ret) {
-                tracing_start();
+        if (ret)
                 goto out;
-        }
 
         ret = trace_test_buffer(&max_tr, &count);
-        if (ret) {
-                tracing_start();
+        if (ret)
                 goto out;
-        }
 
         if (!ret && !count) {
                 printk(KERN_CONT ".. no entries found ..");
                 ret = -1;
-                tracing_start();
                 goto out;
         }
 
         /* do the test by disabling interrupts first this time */
         tracing_max_latency = 0;
         tracing_start();
+        trace->start(tr);
+
         preempt_disable();
         local_irq_disable();
         udelay(100);
@@ -394,6 +516,7 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
         /* reverse the order of preempt vs irqs */
         local_irq_enable();
 
+        trace->stop(tr);
         /* stop the tracing. */
         tracing_stop();
         /* check both trace buffers */
@@ -409,9 +532,10 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
                 goto out;
         }
 
- out:
-        trace->reset(tr);
+out:
         tracing_start();
+out_no_start:
+        trace->reset(tr);
         tracing_max_latency = save_max;
 
         return ret;
@@ -477,7 +601,7 @@ trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
         wait_for_completion(&isrt);
 
         /* start the tracing */
-        ret = trace->init(tr);
+        ret = tracer_init(trace, tr);
         if (ret) {
                 warn_failed_init_tracer(trace, ret);
                 return ret;
@@ -538,7 +662,7 @@ trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr
         int ret;
 
         /* start the tracing */
-        ret = trace->init(tr);
+        ret = tracer_init(trace, tr);
         if (ret) {
                 warn_failed_init_tracer(trace, ret);
                 return ret;
@@ -570,10 +694,10 @@ trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr)
         int ret;
 
         /* start the tracing */
-        ret = trace->init(tr);
+        ret = tracer_init(trace, tr);
         if (ret) {
                 warn_failed_init_tracer(trace, ret);
-                return 0;
+                return ret;
         }
 
         /* Sleep for a 1/10 of a second */
@@ -585,6 +709,11 @@ trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr)
         trace->reset(tr);
         tracing_start();
 
+        if (!ret && !count) {
+                printk(KERN_CONT ".. no entries found ..");
+                ret = -1;
+        }
+
         return ret;
 }
 #endif /* CONFIG_SYSPROF_TRACER */
@@ -597,7 +726,7 @@ trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
         int ret;
 
         /* start the tracing */
-        ret = trace->init(tr);
+        ret = tracer_init(trace, tr);
         if (ret) {
                 warn_failed_init_tracer(trace, ret);
                 return ret;
@@ -612,6 +741,11 @@ trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
         trace->reset(tr);
         tracing_start();
 
+        if (!ret && !count) {
+                printk(KERN_CONT ".. no entries found ..");
+                ret = -1;
+        }
+
         return ret;
 }
 #endif /* CONFIG_BRANCH_TRACER */
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index d0871bc0aca5..c750f65f9661 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -245,16 +245,31 @@ static int trace_lookup_stack(struct seq_file *m, long i)
 #endif
 }
 
+static void print_disabled(struct seq_file *m)
+{
+        seq_puts(m, "#\n"
+                 "#  Stack tracer disabled\n"
+                 "#\n"
+                 "# To enable the stack tracer, either add 'stacktrace' to the\n"
+                 "# kernel command line\n"
+                 "# or 'echo 1 > /proc/sys/kernel/stack_tracer_enabled'\n"
+                 "#\n");
+}
+
 static int t_show(struct seq_file *m, void *v)
 {
         long i;
         int size;
 
         if (v == SEQ_START_TOKEN) {
-                seq_printf(m, "        Depth   Size      Location"
+                seq_printf(m, "        Depth    Size   Location"
                            "    (%d entries)\n"
-                           "        -----   ----      --------\n",
+                           "        -----    ----   --------\n",
                            max_stack_trace.nr_entries);
+
+                if (!stack_tracer_enabled && !max_stack_size)
+                        print_disabled(m);
+
                 return 0;
         }
 
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
new file mode 100644
index 000000000000..acdebd771a93
--- /dev/null
+++ b/kernel/trace/trace_stat.c
@@ -0,0 +1,326 @@
+/*
+ * Infrastructure for statistic tracing (histogram output).
+ *
+ * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ *
+ * Based on the code from trace_branch.c which is
+ * Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+
+
+#include <linux/list.h>
+#include <linux/debugfs.h>
+#include "trace_stat.h"
+#include "trace.h"
+
+
+/* List of stat entries from a tracer */
+struct trace_stat_list {
+        struct list_head        list;
+        void                    *stat;
+};
+
+/* A stat session is the stats output in one file */
+struct tracer_stat_session {
+        struct list_head        session_list;
+        struct tracer_stat      *ts;
+        struct list_head        stat_list;
+        struct mutex            stat_mutex;
+        struct dentry           *file;
+};
+
+/* All of the sessions currently in use. Each stat file embed one session */
+static LIST_HEAD(all_stat_sessions);
+static DEFINE_MUTEX(all_stat_sessions_mutex);
+
+/* The root directory for all stat files */
+static struct dentry            *stat_dir;
+
+
+static void reset_stat_session(struct tracer_stat_session *session)
+{
+        struct trace_stat_list *node, *next;
+
+        list_for_each_entry_safe(node, next, &session->stat_list, list)
+                kfree(node);
+
+        INIT_LIST_HEAD(&session->stat_list);
+}
+
+static void destroy_session(struct tracer_stat_session *session)
+{
+        debugfs_remove(session->file);
+        reset_stat_session(session);
+        mutex_destroy(&session->stat_mutex);
+        kfree(session);
+}
+
+/*
+ * For tracers that don't provide a stat_cmp callback.
+ * This one will force an immediate insertion on tail of
+ * the list.
+ */
+static int dummy_cmp(void *p1, void *p2)
+{
+        return 1;
+}
+
+/*
+ * Initialize the stat list at each trace_stat file opening.
+ * All of these copies and sorting are required on all opening
+ * since the stats could have changed between two file sessions.
+ */
+static int stat_seq_init(struct tracer_stat_session *session)
+{
+        struct trace_stat_list *iter_entry, *new_entry;
+        struct tracer_stat *ts = session->ts;
+        void *stat;
+        int ret = 0;
+        int i;
+
+        mutex_lock(&session->stat_mutex);
+        reset_stat_session(session);
+
+        if (!ts->stat_cmp)
+                ts->stat_cmp = dummy_cmp;
+
+        stat = ts->stat_start();
+        if (!stat)
+                goto exit;
+
+        /*
+         * The first entry. Actually this is the second, but the first
+         * one (the stat_list head) is pointless.
+         */
+        new_entry = kmalloc(sizeof(struct trace_stat_list), GFP_KERNEL);
+        if (!new_entry) {
+                ret = -ENOMEM;
+                goto exit;
+        }
+
+        INIT_LIST_HEAD(&new_entry->list);
+
+        list_add(&new_entry->list, &session->stat_list);
+
+        new_entry->stat = stat;
+
+        /*
+         * Iterate over the tracer stat entries and store them in a sorted
+         * list.
+         */
+        for (i = 1; ; i++) {
+                stat = ts->stat_next(stat, i);
+
+                /* End of insertion */
+                if (!stat)
+                        break;
+
+                new_entry = kmalloc(sizeof(struct trace_stat_list), GFP_KERNEL);
+                if (!new_entry) {
+                        ret = -ENOMEM;
+                        goto exit_free_list;
+                }
+
+                INIT_LIST_HEAD(&new_entry->list);
+                new_entry->stat = stat;
+
+                list_for_each_entry_reverse(iter_entry, &session->stat_list,
+                                list) {
+
+                        /* Insertion with a descendent sorting */
+                        if (ts->stat_cmp(iter_entry->stat,
+                                        new_entry->stat) >= 0) {
+
+                                list_add(&new_entry->list, &iter_entry->list);
+                                break;
+                        }
+                }
+
+                /* The current larger value */
+                if (list_empty(&new_entry->list))
+                        list_add(&new_entry->list, &session->stat_list);
+        }
+exit:
+        mutex_unlock(&session->stat_mutex);
+        return ret;
+
+exit_free_list:
+        reset_stat_session(session);
+        mutex_unlock(&session->stat_mutex);
+        return ret;
+}
+
+
+static void *stat_seq_start(struct seq_file *s, loff_t *pos)
+{
+        struct tracer_stat_session *session = s->private;
+
+        /* Prevent from tracer switch or stat_list modification */
+        mutex_lock(&session->stat_mutex);
+
+        /* If we are in the beginning of the file, print the headers */
+        if (!*pos && session->ts->stat_headers)
+                return SEQ_START_TOKEN;
+
+        return seq_list_start(&session->stat_list, *pos);
+}
+
+static void *stat_seq_next(struct seq_file *s, void *p, loff_t *pos)
+{
+        struct tracer_stat_session *session = s->private;
+
+        if (p == SEQ_START_TOKEN)
+                return seq_list_start(&session->stat_list, *pos);
+
+        return seq_list_next(p, &session->stat_list, pos);
+}
+
+static void stat_seq_stop(struct seq_file *s, void *p)
+{
+        struct tracer_stat_session *session = s->private;
+        mutex_unlock(&session->stat_mutex);
+}
+
+static int stat_seq_show(struct seq_file *s, void *v)
+{
+        struct tracer_stat_session *session = s->private;
+        struct trace_stat_list *l = list_entry(v, struct trace_stat_list, list);
+
+        if (v == SEQ_START_TOKEN)
+                return session->ts->stat_headers(s);
+
+        return session->ts->stat_show(s, l->stat);
+}
+
+static const struct seq_operations trace_stat_seq_ops = {
+        .start          = stat_seq_start,
+        .next           = stat_seq_next,
+        .stop           = stat_seq_stop,
+        .show           = stat_seq_show
+};
+
+/* The session stat is refilled and resorted at each stat file opening */
+static int tracing_stat_open(struct inode *inode, struct file *file)
+{
+        int ret;
+
+        struct tracer_stat_session *session = inode->i_private;
+
+        ret = seq_open(file, &trace_stat_seq_ops);
+        if (!ret) {
+                struct seq_file *m = file->private_data;
+                m->private = session;
+                ret = stat_seq_init(session);
+        }
+
+        return ret;
+}
+
+/*
+ * Avoid consuming memory with our now useless list.
+ */
+static int tracing_stat_release(struct inode *i, struct file *f)
+{
+        struct tracer_stat_session *session = i->i_private;
+
+        mutex_lock(&session->stat_mutex);
+        reset_stat_session(session);
+        mutex_unlock(&session->stat_mutex);
+
+        return 0;
+}
+
+static const struct file_operations tracing_stat_fops = {
+        .open           = tracing_stat_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = tracing_stat_release
+};
+
+static int tracing_stat_init(void)
+{
+        struct dentry *d_tracing;
+
+        d_tracing = tracing_init_dentry();
+
+        stat_dir = debugfs_create_dir("trace_stat", d_tracing);
+        if (!stat_dir)
+                pr_warning("Could not create debugfs "
+                           "'trace_stat' entry\n");
+        return 0;
+}
+
+static int init_stat_file(struct tracer_stat_session *session)
+{
+        if (!stat_dir && tracing_stat_init())
+                return -ENODEV;
+
+        session->file = debugfs_create_file(session->ts->name, 0644,
+                                            stat_dir,
+                                            session, &tracing_stat_fops);
+        if (!session->file)
+                return -ENOMEM;
+        return 0;
+}
+
+int register_stat_tracer(struct tracer_stat *trace)
+{
+        struct tracer_stat_session *session, *node, *tmp;
+        int ret;
+
+        if (!trace)
+                return -EINVAL;
+
+        if (!trace->stat_start || !trace->stat_next || !trace->stat_show)
+                return -EINVAL;
+
+        /* Already registered? */
+        mutex_lock(&all_stat_sessions_mutex);
+        list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) {
+                if (node->ts == trace) {
+                        mutex_unlock(&all_stat_sessions_mutex);
+                        return -EINVAL;
+                }
+        }
+        mutex_unlock(&all_stat_sessions_mutex);
+
+        /* Init the session */
+        session = kmalloc(sizeof(struct tracer_stat_session), GFP_KERNEL);
+        if (!session)
+                return -ENOMEM;
+
+        session->ts = trace;
+        INIT_LIST_HEAD(&session->session_list);
+        INIT_LIST_HEAD(&session->stat_list);
+        mutex_init(&session->stat_mutex);
+        session->file = NULL;
+
+        ret = init_stat_file(session);
+        if (ret) {
+                destroy_session(session);
+                return ret;
+        }
+
+        /* Register */
+        mutex_lock(&all_stat_sessions_mutex);
+        list_add_tail(&session->session_list, &all_stat_sessions);
+        mutex_unlock(&all_stat_sessions_mutex);
+
+        return 0;
+}
+
+void unregister_stat_tracer(struct tracer_stat *trace)
+{
+        struct tracer_stat_session *node, *tmp;
+
+        mutex_lock(&all_stat_sessions_mutex);
+        list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) {
+                if (node->ts == trace) {
+                        list_del(&node->session_list);
+                        destroy_session(node);
+                        break;
+                }
+        }
+        mutex_unlock(&all_stat_sessions_mutex);
+}
diff --git a/kernel/trace/trace_stat.h b/kernel/trace/trace_stat.h
new file mode 100644
index 000000000000..202274cf7f3d
--- /dev/null
+++ b/kernel/trace/trace_stat.h
@@ -0,0 +1,31 @@
+#ifndef __TRACE_STAT_H
+#define __TRACE_STAT_H
+
+#include <linux/seq_file.h>
+
+/*
+ * If you want to provide a stat file (one-shot statistics), fill
+ * an iterator with stat_start/stat_next and a stat_show callbacks.
+ * The others callbacks are optional.
+ */
+struct tracer_stat {
+        /* The name of your stat file */
+        const char              *name;
+        /* Iteration over statistic entries */
+        void                    *(*stat_start)(void);
+        void                    *(*stat_next)(void *prev, int idx);
+        /* Compare two entries for stats sorting */
+        int                     (*stat_cmp)(void *p1, void *p2);
+        /* Print a stat entry */
+        int                     (*stat_show)(struct seq_file *s, void *p);
+        /* Print the headers of your stat entries */
+        int                     (*stat_headers)(struct seq_file *s);
+};
+
+/*
+ * Destroy or create a stat file
+ */
+extern int register_stat_tracer(struct tracer_stat *trace);
+extern void unregister_stat_tracer(struct tracer_stat *trace);
+
+#endif /* __TRACE_STAT_H */
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
new file mode 100644
index 000000000000..a2a3af29c943
--- /dev/null
+++ b/kernel/trace/trace_syscalls.c
@@ -0,0 +1,250 @@
+#include <linux/kernel.h>
+#include <linux/ftrace.h>
+#include <asm/syscall.h>
+
+#include "trace_output.h"
+#include "trace.h"
+
+/* Keep a counter of the syscall tracing users */
+static int refcount;
+
+/* Prevent from races on thread flags toggling */
+static DEFINE_MUTEX(syscall_trace_lock);
+
+/* Option to display the parameters types */
+enum {
+        TRACE_SYSCALLS_OPT_TYPES = 0x1,
+};
+
+static struct tracer_opt syscalls_opts[] = {
+        { TRACER_OPT(syscall_arg_type, TRACE_SYSCALLS_OPT_TYPES) },
+        { }
+};
+
+static struct tracer_flags syscalls_flags = {
+        .val = 0, /* By default: no parameters types */
+        .opts = syscalls_opts
+};
+
+enum print_line_t
+print_syscall_enter(struct trace_iterator *iter, int flags)
+{
+        struct trace_seq *s = &iter->seq;
+        struct trace_entry *ent = iter->ent;
+        struct syscall_trace_enter *trace;
+        struct syscall_metadata *entry;
+        int i, ret, syscall;
+
+        trace_assign_type(trace, ent);
+
+        syscall = trace->nr;
+
+        entry = syscall_nr_to_meta(syscall);
+        if (!entry)
+                goto end;
+
+        ret = trace_seq_printf(s, "%s(", entry->name);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        for (i = 0; i < entry->nb_args; i++) {
+                /* parameter types */
+                if (syscalls_flags.val & TRACE_SYSCALLS_OPT_TYPES) {
+                        ret = trace_seq_printf(s, "%s ", entry->types[i]);
+                        if (!ret)
+                                return TRACE_TYPE_PARTIAL_LINE;
+                }
+                /* parameter values */
+                ret = trace_seq_printf(s, "%s: %lx%s ", entry->args[i],
+                                       trace->args[i],
+                                       i == entry->nb_args - 1 ? ")" : ",");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+end:
+        trace_seq_printf(s, "\n");
+        return TRACE_TYPE_HANDLED;
+}
+
+enum print_line_t
+print_syscall_exit(struct trace_iterator *iter, int flags)
+{
+        struct trace_seq *s = &iter->seq;
+        struct trace_entry *ent = iter->ent;
+        struct syscall_trace_exit *trace;
+        int syscall;
+        struct syscall_metadata *entry;
+        int ret;
+
+        trace_assign_type(trace, ent);
+
+        syscall = trace->nr;
+
+        entry = syscall_nr_to_meta(syscall);
+        if (!entry) {
+                trace_seq_printf(s, "\n");
+                return TRACE_TYPE_HANDLED;
+        }
+
+        ret = trace_seq_printf(s, "%s -> 0x%lx\n", entry->name,
+                                trace->ret);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+void start_ftrace_syscalls(void)
+{
+        unsigned long flags;
+        struct task_struct *g, *t;
+
+        mutex_lock(&syscall_trace_lock);
+
+        /* Don't enable the flag on the tasks twice */
+        if (++refcount != 1)
+                goto unlock;
+
+        arch_init_ftrace_syscalls();
+        read_lock_irqsave(&tasklist_lock, flags);
+
+        do_each_thread(g, t) {
+                set_tsk_thread_flag(t, TIF_SYSCALL_FTRACE);
+        } while_each_thread(g, t);
+
+        read_unlock_irqrestore(&tasklist_lock, flags);
+
+unlock:
+        mutex_unlock(&syscall_trace_lock);
+}
+
+void stop_ftrace_syscalls(void)
+{
+        unsigned long flags;
+        struct task_struct *g, *t;
+
+        mutex_lock(&syscall_trace_lock);
+
+        /* There are perhaps still some users */
+        if (--refcount)
+                goto unlock;
+
+        read_lock_irqsave(&tasklist_lock, flags);
+
+        do_each_thread(g, t) {
+                clear_tsk_thread_flag(t, TIF_SYSCALL_FTRACE);
+        } while_each_thread(g, t);
+
+        read_unlock_irqrestore(&tasklist_lock, flags);
+
+unlock:
+        mutex_unlock(&syscall_trace_lock);
+}
+
+void ftrace_syscall_enter(struct pt_regs *regs)
+{
+        struct syscall_trace_enter *entry;
+        struct syscall_metadata *sys_data;
+        struct ring_buffer_event *event;
+        int size;
+        int syscall_nr;
+
+        syscall_nr = syscall_get_nr(current, regs);
+
+        sys_data = syscall_nr_to_meta(syscall_nr);
+        if (!sys_data)
+                return;
+
+        size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args;
+
+        event = trace_current_buffer_lock_reserve(TRACE_SYSCALL_ENTER, size,
+                                                        0, 0);
+        if (!event)
+                return;
+
+        entry = ring_buffer_event_data(event);
+        entry->nr = syscall_nr;
+        syscall_get_arguments(current, regs, 0, sys_data->nb_args, entry->args);
+
+        trace_current_buffer_unlock_commit(event, 0, 0);
+        trace_wake_up();
+}
+
+void ftrace_syscall_exit(struct pt_regs *regs)
+{
+        struct syscall_trace_exit *entry;
+        struct syscall_metadata *sys_data;
+        struct ring_buffer_event *event;
+        int syscall_nr;
+
+        syscall_nr = syscall_get_nr(current, regs);
+
+        sys_data = syscall_nr_to_meta(syscall_nr);
+        if (!sys_data)
+                return;
+
+        event = trace_current_buffer_lock_reserve(TRACE_SYSCALL_EXIT,
+                                sizeof(*entry), 0, 0);
+        if (!event)
+                return;
+
+        entry = ring_buffer_event_data(event);
+        entry->nr = syscall_nr;
+        entry->ret = syscall_get_return_value(current, regs);
+
+        trace_current_buffer_unlock_commit(event, 0, 0);
+        trace_wake_up();
+}
+
+static int init_syscall_tracer(struct trace_array *tr)
+{
+        start_ftrace_syscalls();
+
+        return 0;
+}
+
+static void reset_syscall_tracer(struct trace_array *tr)
+{
+        stop_ftrace_syscalls();
+        tracing_reset_online_cpus(tr);
+}
+
+static struct trace_event syscall_enter_event = {
+        .type           = TRACE_SYSCALL_ENTER,
+        .trace          = print_syscall_enter,
+};
+
+static struct trace_event syscall_exit_event = {
+        .type           = TRACE_SYSCALL_EXIT,
+        .trace          = print_syscall_exit,
+};
+
+static struct tracer syscall_tracer __read_mostly = {
+        .name           = "syscall",
+        .init           = init_syscall_tracer,
+        .reset          = reset_syscall_tracer,
+        .flags          = &syscalls_flags,
+};
+
+__init int register_ftrace_syscalls(void)
+{
+        int ret;
+
+        ret = register_ftrace_event(&syscall_enter_event);
+        if (!ret) {
+                printk(KERN_WARNING "event %d failed to register\n",
+                       syscall_enter_event.type);
+                WARN_ON_ONCE(1);
+        }
+
+        ret = register_ftrace_event(&syscall_exit_event);
+        if (!ret) {
+                printk(KERN_WARNING "event %d failed to register\n",
+                       syscall_exit_event.type);
+                WARN_ON_ONCE(1);
+        }
+
+        return register_tracer(&syscall_tracer);
+}
+device_initcall(register_ftrace_syscalls);
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
index eaca5ad803ff..91fd19c2149f 100644
--- a/kernel/trace/trace_sysprof.c
+++ b/kernel/trace/trace_sysprof.c
@@ -88,7 +88,7 @@ static void backtrace_address(void *data, unsigned long addr, int reliable)
         }
 }
 
-const static struct stacktrace_ops backtrace_ops = {
+static const struct stacktrace_ops backtrace_ops = {
         .warning                = backtrace_warning,
         .warning_symbol         = backtrace_warning_symbol,
         .stack                  = backtrace_stack,
@@ -226,15 +226,6 @@ static void stop_stack_timers(void)
                 stop_stack_timer(cpu);
 }
 
-static void start_stack_trace(struct trace_array *tr)
-{
-        mutex_lock(&sample_timer_lock);
-        tracing_reset_online_cpus(tr);
-        start_stack_timers();
-        tracer_enabled = 1;
-        mutex_unlock(&sample_timer_lock);
-}
-
 static void stop_stack_trace(struct trace_array *tr)
 {
         mutex_lock(&sample_timer_lock);
@@ -247,12 +238,18 @@ static int stack_trace_init(struct trace_array *tr)
 {
         sysprof_trace = tr;
 
-        start_stack_trace(tr);
+        tracing_start_cmdline_record();
+
+        mutex_lock(&sample_timer_lock);
+        start_stack_timers();
+        tracer_enabled = 1;
+        mutex_unlock(&sample_timer_lock);
         return 0;
 }
 
 static void stack_trace_reset(struct trace_array *tr)
 {
+        tracing_stop_cmdline_record();
         stop_stack_trace(tr);
 }
 
@@ -317,7 +314,7 @@ sysprof_sample_write(struct file *filp, const char __user *ubuf,
         return cnt;
 }
 
-static struct file_operations sysprof_sample_fops = {
+static const struct file_operations sysprof_sample_fops = {
         .read           = sysprof_sample_read,
         .write          = sysprof_sample_write,
 };
@@ -330,5 +327,5 @@ void init_tracer_sysprof_debugfs(struct dentry *d_tracer)
                         d_tracer, NULL, &sysprof_sample_fops);
         if (entry)
                 return;
-        pr_warning("Could not create debugfs 'dyn_ftrace_total_info' entry\n");
+        pr_warning("Could not create debugfs 'sysprof_sample_period' entry\n");
 }
diff --git a/kernel/trace/trace_workqueue.c b/kernel/trace/trace_workqueue.c
new file mode 100644
index 000000000000..797201e4a137
--- /dev/null
+++ b/kernel/trace/trace_workqueue.c
@@ -0,0 +1,288 @@
+/*
+ * Workqueue statistical tracer.
+ *
+ * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ *
+ */
+
+
+#include <trace/workqueue.h>
+#include <linux/list.h>
+#include <linux/percpu.h>
+#include "trace_stat.h"
+#include "trace.h"
+
+
+/* A cpu workqueue thread */
+struct cpu_workqueue_stats {
+        struct list_head            list;
+/* Useful to know if we print the cpu headers */
+        bool                        first_entry;
+        int                         cpu;
+        pid_t                       pid;
+/* Can be inserted from interrupt or user context, need to be atomic */
+        atomic_t                    inserted;
+/*
+ *  Don't need to be atomic, works are serialized in a single workqueue thread
+ *  on a single CPU.
+ */
+        unsigned int                executed;
+};
+
+/* List of workqueue threads on one cpu */
+struct workqueue_global_stats {
+        struct list_head        list;
+        spinlock_t              lock;
+};
+
+/* Don't need a global lock because allocated before the workqueues, and
+ * never freed.
+ */
+static DEFINE_PER_CPU(struct workqueue_global_stats, all_workqueue_stat);
+#define workqueue_cpu_stat(cpu) (&per_cpu(all_workqueue_stat, cpu))
+
+/* Insertion of a work */
+static void
+probe_workqueue_insertion(struct task_struct *wq_thread,
+                          struct work_struct *work)
+{
+        int cpu = cpumask_first(&wq_thread->cpus_allowed);
+        struct cpu_workqueue_stats *node, *next;
+        unsigned long flags;
+
+        spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+        list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
+                                                        list) {
+                if (node->pid == wq_thread->pid) {
+                        atomic_inc(&node->inserted);
+                        goto found;
+                }
+        }
+        pr_debug("trace_workqueue: entry not found\n");
+found:
+        spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+}
+
+/* Execution of a work */
+static void
+probe_workqueue_execution(struct task_struct *wq_thread,
+                          struct work_struct *work)
+{
+        int cpu = cpumask_first(&wq_thread->cpus_allowed);
+        struct cpu_workqueue_stats *node, *next;
+        unsigned long flags;
+
+        spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+        list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
+                                                        list) {
+                if (node->pid == wq_thread->pid) {
+                        node->executed++;
+                        goto found;
+                }
+        }
+        pr_debug("trace_workqueue: entry not found\n");
+found:
+        spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+}
+
+/* Creation of a cpu workqueue thread */
+static void probe_workqueue_creation(struct task_struct *wq_thread, int cpu)
+{
+        struct cpu_workqueue_stats *cws;
+        unsigned long flags;
+
+        WARN_ON(cpu < 0);
+
+        /* Workqueues are sometimes created in atomic context */
+        cws = kzalloc(sizeof(struct cpu_workqueue_stats), GFP_ATOMIC);
+        if (!cws) {
+                pr_warning("trace_workqueue: not enough memory\n");
+                return;
+        }
+        INIT_LIST_HEAD(&cws->list);
+        cws->cpu = cpu;
+
+        cws->pid = wq_thread->pid;
+
+        spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+        if (list_empty(&workqueue_cpu_stat(cpu)->list))
+                cws->first_entry = true;
+        list_add_tail(&cws->list, &workqueue_cpu_stat(cpu)->list);
+        spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+}
+
+/* Destruction of a cpu workqueue thread */
+static void probe_workqueue_destruction(struct task_struct *wq_thread)
+{
+        /* Workqueue only execute on one cpu */
+        int cpu = cpumask_first(&wq_thread->cpus_allowed);
+        struct cpu_workqueue_stats *node, *next;
+        unsigned long flags;
+
+        spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+        list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
+                                                        list) {
+                if (node->pid == wq_thread->pid) {
+                        list_del(&node->list);
+                        kfree(node);
+                        goto found;
+                }
+        }
+
+        pr_debug("trace_workqueue: don't find workqueue to destroy\n");
+found:
+        spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+
+}
+
+static struct cpu_workqueue_stats *workqueue_stat_start_cpu(int cpu)
+{
+        unsigned long flags;
+        struct cpu_workqueue_stats *ret = NULL;
+
+
+        spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+
+        if (!list_empty(&workqueue_cpu_stat(cpu)->list))
+                ret = list_entry(workqueue_cpu_stat(cpu)->list.next,
+                                 struct cpu_workqueue_stats, list);
+
+        spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+
+        return ret;
+}
+
+static void *workqueue_stat_start(void)
+{
+        int cpu;
+        void *ret = NULL;
+
+        for_each_possible_cpu(cpu) {
+                ret = workqueue_stat_start_cpu(cpu);
+                if (ret)
+                        return ret;
+        }
+        return NULL;
+}
+
+static void *workqueue_stat_next(void *prev, int idx)
+{
+        struct cpu_workqueue_stats *prev_cws = prev;
+        int cpu = prev_cws->cpu;
+        unsigned long flags;
+        void *ret = NULL;
+
+        spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+        if (list_is_last(&prev_cws->list, &workqueue_cpu_stat(cpu)->list)) {
+                spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+                do {
+                        cpu = cpumask_next(cpu, cpu_possible_mask);
+                        if (cpu >= nr_cpu_ids)
+                                return NULL;
+                } while (!(ret = workqueue_stat_start_cpu(cpu)));
+                return ret;
+        }
+        spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+
+        return list_entry(prev_cws->list.next, struct cpu_workqueue_stats,
+                          list);
+}
+
+static int workqueue_stat_show(struct seq_file *s, void *p)
+{
+        struct cpu_workqueue_stats *cws = p;
+        unsigned long flags;
+        int cpu = cws->cpu;
+        struct pid *pid;
+        struct task_struct *tsk;
+
+        spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+        if (&cws->list == workqueue_cpu_stat(cpu)->list.next)
+                seq_printf(s, "\n");
+        spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+
+        pid = find_get_pid(cws->pid);
+        if (pid) {
+                tsk = get_pid_task(pid, PIDTYPE_PID);
+                if (tsk) {
+                        seq_printf(s, "%3d %6d     %6u       %s\n", cws->cpu,
+                                   atomic_read(&cws->inserted), cws->executed,
+                                   tsk->comm);
+                        put_task_struct(tsk);
+                }
+                put_pid(pid);
+        }
+
+        return 0;
+}
+
+static int workqueue_stat_headers(struct seq_file *s)
+{
+        seq_printf(s, "# CPU  INSERTED  EXECUTED   NAME\n");
+        seq_printf(s, "# |      |         |          |\n");
+        return 0;
+}
+
+struct tracer_stat workqueue_stats __read_mostly = {
+        .name = "workqueues",
+        .stat_start = workqueue_stat_start,
+        .stat_next = workqueue_stat_next,
+        .stat_show = workqueue_stat_show,
+        .stat_headers = workqueue_stat_headers
+};
+
+
+int __init stat_workqueue_init(void)
+{
+        if (register_stat_tracer(&workqueue_stats)) {
+                pr_warning("Unable to register workqueue stat tracer\n");
+                return 1;
+        }
+
+        return 0;
+}
+fs_initcall(stat_workqueue_init);
+
+/*
+ * Workqueues are created very early, just after pre-smp initcalls.
+ * So we must register our tracepoints at this stage.
+ */
+int __init trace_workqueue_early_init(void)
+{
+        int ret, cpu;
+
+        ret = register_trace_workqueue_insertion(probe_workqueue_insertion);
+        if (ret)
+                goto out;
+
+        ret = register_trace_workqueue_execution(probe_workqueue_execution);
+        if (ret)
+                goto no_insertion;
+
+        ret = register_trace_workqueue_creation(probe_workqueue_creation);
+        if (ret)
+                goto no_execution;
+
+        ret = register_trace_workqueue_destruction(probe_workqueue_destruction);
+        if (ret)
+                goto no_creation;
+
+        for_each_possible_cpu(cpu) {
+                spin_lock_init(&workqueue_cpu_stat(cpu)->lock);
+                INIT_LIST_HEAD(&workqueue_cpu_stat(cpu)->list);
+        }
+
+        return 0;
+
+no_creation:
+        unregister_trace_workqueue_creation(probe_workqueue_creation);
+no_execution:
+        unregister_trace_workqueue_execution(probe_workqueue_execution);
+no_insertion:
+        unregister_trace_workqueue_insertion(probe_workqueue_insertion);
+out:
+        pr_warning("trace_workqueue: unable to trace workqueues\n");
+
+        return 1;
+}
+early_initcall(trace_workqueue_early_init);
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index 79602740bbb5..1ef5d3a601c7 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -272,12 +272,15 @@ static void disable_tracepoint(struct tracepoint *elem)
  *
  * Updates the probe callback corresponding to a range of tracepoints.
  */
-void tracepoint_update_probe_range(struct tracepoint *begin,
-        struct tracepoint *end)
+void
+tracepoint_update_probe_range(struct tracepoint *begin, struct tracepoint *end)
 {
         struct tracepoint *iter;
         struct tracepoint_entry *mark_entry;
 
+        if (!begin)
+                return;
+
         mutex_lock(&tracepoints_mutex);
         for (iter = begin; iter < end; iter++) {
                 mark_entry = get_tracepoint(iter->name);
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 43f891b05a4b..00d59d048edf 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -122,8 +122,10 @@ void acct_update_integrals(struct task_struct *tsk)
         if (likely(tsk->mm)) {
                 cputime_t time, dtime;
                 struct timeval value;
+                unsigned long flags;
                 u64 delta;
 
+                local_irq_save(flags);
                 time = tsk->stime + tsk->utime;
                 dtime = cputime_sub(time, tsk->acct_timexpd);
                 jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
@@ -131,10 +133,12 @@ void acct_update_integrals(struct task_struct *tsk)
                 delta = delta * USEC_PER_SEC + value.tv_usec;
 
                 if (delta == 0)
-                        return;
+                        goto out;
                 tsk->acct_timexpd = time;
                 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
                 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
+        out:
+                local_irq_restore(flags);
         }
 }
 
diff --git a/kernel/user.c b/kernel/user.c
index 477b6660f447..850e0ba41c1e 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -20,7 +20,7 @@
 
 struct user_namespace init_user_ns = {
         .kref = {
-                .refcount       = ATOMIC_INIT(1),
+                .refcount       = ATOMIC_INIT(2),
         },
         .creator = &root_user,
 };
@@ -72,6 +72,7 @@ static void uid_hash_insert(struct user_struct *up, struct hlist_head *hashent)
 static void uid_hash_remove(struct user_struct *up)
 {
         hlist_del_init(&up->uidhash_node);
+        put_user_ns(up->user_ns);
 }
 
 static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
@@ -285,14 +286,12 @@ int __init uids_sysfs_init(void)
 /* work function to remove sysfs directory for a user and free up
  * corresponding structures.
  */
-static void remove_user_sysfs_dir(struct work_struct *w)
+static void cleanup_user_struct(struct work_struct *w)
 {
         struct user_struct *up = container_of(w, struct user_struct, work);
         unsigned long flags;
         int remove_user = 0;
 
-        if (up->user_ns != &init_user_ns)
-                return;
         /* Make uid_hash_remove() + sysfs_remove_file() + kobject_del()
          * atomic.
          */
@@ -311,9 +310,11 @@ static void remove_user_sysfs_dir(struct work_struct *w)
         if (!remove_user)
                 goto done;
 
-        kobject_uevent(&up->kobj, KOBJ_REMOVE);
-        kobject_del(&up->kobj);
-        kobject_put(&up->kobj);
+        if (up->user_ns == &init_user_ns) {
+                kobject_uevent(&up->kobj, KOBJ_REMOVE);
+                kobject_del(&up->kobj);
+                kobject_put(&up->kobj);
+        }
 
         sched_destroy_user(up);
         key_put(up->uid_keyring);
@@ -334,8 +335,7 @@ static void free_user(struct user_struct *up, unsigned long flags)
         atomic_inc(&up->__count);
         spin_unlock_irqrestore(&uidhash_lock, flags);
 
-        put_user_ns(up->user_ns);
-        INIT_WORK(&up->work, remove_user_sysfs_dir);
+        INIT_WORK(&up->work, cleanup_user_struct);
         schedule_work(&up->work);
 }
 
@@ -357,12 +357,29 @@ static void free_user(struct user_struct *up, unsigned long flags)
         sched_destroy_user(up);
         key_put(up->uid_keyring);
         key_put(up->session_keyring);
-        put_user_ns(up->user_ns);
         kmem_cache_free(uid_cachep, up);
 }
 
 #endif
 
+#if defined(CONFIG_RT_GROUP_SCHED) && defined(CONFIG_USER_SCHED)
+/*
+ * We need to check if a setuid can take place. This function should be called
+ * before successfully completing the setuid.
+ */
+int task_can_switch_user(struct user_struct *up, struct task_struct *tsk)
+{
+
+        return sched_rt_can_attach(up->tg, tsk);
+
+}
+#else
+int task_can_switch_user(struct user_struct *up, struct task_struct *tsk)
+{
+        return 1;
+}
+#endif
+
 /*
  * Locate the user_struct for the passed UID.  If found, take a ref on it.  The
  * caller must undo that ref with free_uid().
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 79084311ee57..076c7c8215b0 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -60,12 +60,25 @@ int create_user_ns(struct cred *new)
         return 0;
 }
 
-void free_user_ns(struct kref *kref)
+/*
+ * Deferred destructor for a user namespace.  This is required because
+ * free_user_ns() may be called with uidhash_lock held, but we need to call
+ * back to free_uid() which will want to take the lock again.
+ */
+static void free_user_ns_work(struct work_struct *work)
 {
-        struct user_namespace *ns;
-
-        ns = container_of(kref, struct user_namespace, kref);
+        struct user_namespace *ns =
+                container_of(work, struct user_namespace, destroyer);
         free_uid(ns->creator);
         kfree(ns);
 }
+
+void free_user_ns(struct kref *kref)
+{
+        struct user_namespace *ns =
+                container_of(kref, struct user_namespace, kref);
+
+        INIT_WORK(&ns->destroyer, free_user_ns_work);
+        schedule_work(&ns->destroyer);
+}
 EXPORT_SYMBOL(free_user_ns);
diff --git a/kernel/utsname_sysctl.c b/kernel/utsname_sysctl.c
index 3b34b3545936..92359cc747a7 100644
--- a/kernel/utsname_sysctl.c
+++ b/kernel/utsname_sysctl.c
@@ -37,7 +37,7 @@ static void put_uts(ctl_table *table, int write, void *which)
                 up_write(&uts_sem);
 }
 
-#ifdef CONFIG_PROC_FS
+#ifdef CONFIG_PROC_SYSCTL
 /*
  *      Special case of dostring for the UTS structure. This has locks
  *      to observe. Should this be in kernel/sys.c ????
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 1f0c509b40d3..b6b966ce1451 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -33,6 +33,7 @@
 #include <linux/kallsyms.h>
 #include <linux/debug_locks.h>
 #include <linux/lockdep.h>
+#include <trace/workqueue.h>
 
 /*
  * The per-CPU workqueue (if single thread, we always use the first
@@ -48,8 +49,6 @@ struct cpu_workqueue_struct {
 
         struct workqueue_struct *wq;
         struct task_struct *thread;
-
-        int run_depth;          /* Detect run_workqueue() recursion depth */
 } ____cacheline_aligned;
 
 /*
@@ -125,9 +124,13 @@ struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
         return (void *) (atomic_long_read(&work->data) & WORK_STRUCT_WQ_DATA_MASK);
 }
 
+DEFINE_TRACE(workqueue_insertion);
+
 static void insert_work(struct cpu_workqueue_struct *cwq,
                         struct work_struct *work, struct list_head *head)
 {
+        trace_workqueue_insertion(cwq->thread, work);
+
         set_wq_data(work, cwq);
         /*
          * Ensure that we get the right work->data if we see the
@@ -259,16 +262,11 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
 }
 EXPORT_SYMBOL_GPL(queue_delayed_work_on);
 
+DEFINE_TRACE(workqueue_execution);
+
 static void run_workqueue(struct cpu_workqueue_struct *cwq)
 {
         spin_lock_irq(&cwq->lock);
-        cwq->run_depth++;
-        if (cwq->run_depth > 3) {
-                /* morton gets to eat his hat */
-                printk("%s: recursion depth exceeded: %d\n",
-                        __func__, cwq->run_depth);
-                dump_stack();
-        }
         while (!list_empty(&cwq->worklist)) {
                 struct work_struct *work = list_entry(cwq->worklist.next,
                                                 struct work_struct, entry);
@@ -284,7 +282,7 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
                  */
                 struct lockdep_map lockdep_map = work->lockdep_map;
 #endif
-
+                trace_workqueue_execution(cwq->thread, work);
                 cwq->current_work = work;
                 list_del_init(cwq->worklist.next);
                 spin_unlock_irq(&cwq->lock);
@@ -311,7 +309,6 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
                 spin_lock_irq(&cwq->lock);
                 cwq->current_work = NULL;
         }
-        cwq->run_depth--;
         spin_unlock_irq(&cwq->lock);
 }
 
@@ -368,29 +365,20 @@ static void insert_wq_barrier(struct cpu_workqueue_struct *cwq,
 
 static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
 {
-        int active;
-
-        if (cwq->thread == current) {
-                /*
-                 * Probably keventd trying to flush its own queue. So simply run
-                 * it by hand rather than deadlocking.
-                 */
-                run_workqueue(cwq);
-                active = 1;
-        } else {
-                struct wq_barrier barr;
+        int active = 0;
+        struct wq_barrier barr;
 
-                active = 0;
-                spin_lock_irq(&cwq->lock);
-                if (!list_empty(&cwq->worklist) || cwq->current_work != NULL) {
-                        insert_wq_barrier(cwq, &barr, &cwq->worklist);
-                        active = 1;
-                }
-                spin_unlock_irq(&cwq->lock);
+        WARN_ON(cwq->thread == current);
 
-                if (active)
-                        wait_for_completion(&barr.done);
+        spin_lock_irq(&cwq->lock);
+        if (!list_empty(&cwq->worklist) || cwq->current_work != NULL) {
+                insert_wq_barrier(cwq, &barr, &cwq->worklist);
+                active = 1;
         }
+        spin_unlock_irq(&cwq->lock);
+
+        if (active)
+                wait_for_completion(&barr.done);
 
         return active;
 }
@@ -416,7 +404,7 @@ void flush_workqueue(struct workqueue_struct *wq)
         might_sleep();
         lock_map_acquire(&wq->lockdep_map);
         lock_map_release(&wq->lockdep_map);
-        for_each_cpu_mask_nr(cpu, *cpu_map)
+        for_each_cpu(cpu, cpu_map)
                 flush_cpu_workqueue(per_cpu_ptr(wq->cpu_wq, cpu));
 }
 EXPORT_SYMBOL_GPL(flush_workqueue);
@@ -547,7 +535,7 @@ static void wait_on_work(struct work_struct *work)
         wq = cwq->wq;
         cpu_map = wq_cpu_map(wq);
 
-        for_each_cpu_mask_nr(cpu, *cpu_map)
+        for_each_cpu(cpu, cpu_map)
                 wait_on_cpu_work(per_cpu_ptr(wq->cpu_wq, cpu), work);
 }
 
@@ -765,6 +753,8 @@ init_cpu_workqueue(struct workqueue_struct *wq, int cpu)
         return cwq;
 }
 
+DEFINE_TRACE(workqueue_creation);
+
 static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
 {
         struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
@@ -787,6 +777,8 @@ static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
                 sched_setscheduler_nocheck(p, SCHED_FIFO, &param);
         cwq->thread = p;
 
+        trace_workqueue_creation(cwq->thread, cpu);
+
         return 0;
 }
 
@@ -868,6 +860,8 @@ struct workqueue_struct *__create_workqueue_key(const char *name,
 }
 EXPORT_SYMBOL_GPL(__create_workqueue_key);
 
+DEFINE_TRACE(workqueue_destruction);
+
 static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
 {
         /*
@@ -891,6 +885,7 @@ static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
          * checks list_empty(), and a "normal" queue_work() can't use
          * a dead CPU.
          */
+        trace_workqueue_destruction(cwq->thread);
         kthread_stop(cwq->thread);
         cwq->thread = NULL;
 }
@@ -911,7 +906,7 @@ void destroy_workqueue(struct workqueue_struct *wq)
         list_del(&wq->list);
         spin_unlock(&workqueue_lock);
 
-        for_each_cpu_mask_nr(cpu, *cpu_map)
+        for_each_cpu(cpu, cpu_map)
                 cleanup_workqueue_thread(per_cpu_ptr(wq->cpu_wq, cpu));
         cpu_maps_update_done();