Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

97 files changed, 2329 insertions, 773 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index 7b974699f8c2..a987aa1676b5 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -91,6 +91,9 @@ obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
 obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
 obj-$(CONFIG_TRACEPOINTS) += tracepoint.o
 obj-$(CONFIG_LATENCYTOP) += latencytop.o
+obj-$(CONFIG_BINFMT_ELF) += elfcore.o
+obj-$(CONFIG_COMPAT_BINFMT_ELF) += elfcore.o
+obj-$(CONFIG_BINFMT_ELF_FDPIC) += elfcore.o
 obj-$(CONFIG_FUNCTION_TRACER) += trace/
 obj-$(CONFIG_TRACING) += trace/
 obj-$(CONFIG_X86_DS) += trace/
diff --git a/kernel/acct.c b/kernel/acct.c
index a6605ca921b6..24f8c81fc48d 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -588,16 +588,6 @@ out:
 }
 
 /**
- * acct_init_pacct - initialize a new pacct_struct
- * @pacct: per-process accounting info struct to initialize
- */
-void acct_init_pacct(struct pacct_struct *pacct)
-{
-        memset(pacct, 0, sizeof(struct pacct_struct));
-        pacct->ac_utime = pacct->ac_stime = cputime_zero;
-}
-
-/**
  * acct_collect - collect accounting information into pacct_struct
  * @exitcode: task exit code
  * @group_dead: not 0, if this thread is the last one in the process.
diff --git a/kernel/async.c b/kernel/async.c
index 27235f5de198..15319d6c18fe 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -56,6 +56,7 @@ asynchronous and synchronous parts of the kernel.
 #include <linux/init.h>
 #include <linux/kthread.h>
 #include <linux/delay.h>
+#include <linux/slab.h>
 #include <asm/atomic.h>
 
 static async_cookie_t next_cookie = 1;
diff --git a/kernel/audit.c b/kernel/audit.c
index 5feed232be9d..c71bd26631a2 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -46,6 +46,7 @@
 #include <asm/atomic.h>
 #include <linux/mm.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/err.h>
 #include <linux/kthread.h>
 
@@ -398,7 +399,7 @@ static void kauditd_send_skb(struct sk_buff *skb)
         skb_get(skb);
         err = netlink_unicast(audit_sock, skb, audit_nlk_pid, 0);
         if (err < 0) {
-                BUG_ON(err != -ECONNREFUSED); /* Shoudn't happen */
+                BUG_ON(err != -ECONNREFUSED); /* Shouldn't happen */
                 printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
                 audit_log_lost("auditd dissapeared\n");
                 audit_pid = 0;
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index 028e85663f27..46a57b57a335 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -3,6 +3,7 @@
 #include <linux/namei.h>
 #include <linux/mount.h>
 #include <linux/kthread.h>
+#include <linux/slab.h>
 
 struct audit_tree;
 struct audit_chunk;
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index cc7e87936cbc..8df43696f4ba 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -27,6 +27,7 @@
 #include <linux/namei.h>
 #include <linux/netlink.h>
 #include <linux/sched.h>
+#include <linux/slab.h>
 #include <linux/inotify.h>
 #include <linux/security.h>
 #include "audit.h"
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index a70604047f3c..ce08041f578d 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -27,6 +27,7 @@
 #include <linux/namei.h>
 #include <linux/netlink.h>
 #include <linux/sched.h>
+#include <linux/slab.h>
 #include <linux/security.h>
 #include "audit.h"
 
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index f3a461c0970a..3828ad5fb8f1 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -49,6 +49,7 @@
 #include <linux/namei.h>
 #include <linux/mm.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/mount.h>
 #include <linux/socket.h>
 #include <linux/mqueue.h>
@@ -1893,7 +1894,7 @@ static int audit_inc_name_count(struct audit_context *context,
 {
         if (context->name_count >= AUDIT_NAMES) {
                 if (inode)
-                        printk(KERN_DEBUG "name_count maxed, losing inode data: "
+                        printk(KERN_DEBUG "audit: name_count maxed, losing inode data: "
                                "dev=%02x:%02x, inode=%lu\n",
                                MAJOR(inode->i_sb->s_dev),
                                MINOR(inode->i_sb->s_dev),
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 4fd90e129772..e2769e13980c 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4,6 +4,10 @@
  *  Based originally on the cpuset system, extracted by Paul Menage
  *  Copyright (C) 2006 Google, Inc
  *
+ *  Notifications support
+ *  Copyright (C) 2009 Nokia Corporation
+ *  Author: Kirill A. Shutemov
+ *
  *  Copyright notices from the original cpuset code:
  *  --------------------------------------------------
  *  Copyright (C) 2003 BULL SA.
@@ -23,7 +27,6 @@
  */
 
 #include <linux/cgroup.h>
-#include <linux/module.h>
 #include <linux/ctype.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
@@ -44,6 +47,7 @@
 #include <linux/string.h>
 #include <linux/sort.h>
 #include <linux/kmod.h>
+#include <linux/module.h>
 #include <linux/delayacct.h>
 #include <linux/cgroupstats.h>
 #include <linux/hash.h>
@@ -52,15 +56,21 @@
 #include <linux/pid_namespace.h>
 #include <linux/idr.h>
 #include <linux/vmalloc.h> /* TODO: replace with more sophisticated array */
+#include <linux/eventfd.h>
+#include <linux/poll.h>
 
 #include <asm/atomic.h>
 
 static DEFINE_MUTEX(cgroup_mutex);
 
-/* Generate an array of cgroup subsystem pointers */
+/*
+ * Generate an array of cgroup subsystem pointers. At boot time, this is
+ * populated up to CGROUP_BUILTIN_SUBSYS_COUNT, and modular subsystems are
+ * registered after that. The mutable section of this array is protected by
+ * cgroup_mutex.
+ */
 #define SUBSYS(_x) &_x ## _subsys,
-
-static struct cgroup_subsys *subsys[] = {
+static struct cgroup_subsys *subsys[CGROUP_SUBSYS_COUNT] = {
 #include <linux/cgroup_subsys.h>
 };
 
@@ -147,6 +157,35 @@ struct css_id {
         unsigned short stack[0]; /* Array of Length (depth+1) */
 };
 
+/*
+ * cgroup_event represents events which userspace want to recieve.
+ */
+struct cgroup_event {
+        /*
+         * Cgroup which the event belongs to.
+         */
+        struct cgroup *cgrp;
+        /*
+         * Control file which the event associated.
+         */
+        struct cftype *cft;
+        /*
+         * eventfd to signal userspace about the event.
+         */
+        struct eventfd_ctx *eventfd;
+        /*
+         * Each of these stored in a list by the cgroup.
+         */
+        struct list_head list;
+        /*
+         * All fields below needed to unregister event when
+         * userspace closes eventfd.
+         */
+        poll_table pt;
+        wait_queue_head_t *wqh;
+        wait_queue_t wait;
+        struct work_struct remove;
+};
 
 /* The list of hierarchy roots */
 
@@ -250,7 +289,8 @@ 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);
+static int cgroup_init_idr(struct cgroup_subsys *ss,
+                           struct cgroup_subsys_state *css);
 
 /* css_set_lock protects the list of css_set objects, and the
  * chain of tasks off each css_set.  Nests outside task->alloc_lock
@@ -448,8 +488,11 @@ static struct css_set *find_existing_css_set(
         struct hlist_node *node;
         struct css_set *cg;
 
-        /* Built the set of subsystem state objects that we want to
-         * see in the new css_set */
+        /*
+         * Build the set of subsystem state objects that we want to see in the
+         * new css_set. while subsystems can change globally, the entries here
+         * won't change, so no need for locking.
+         */
         for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
                 if (root->subsys_bits & (1UL << i)) {
                         /* Subsystem is in this hierarchy. So we want
@@ -696,6 +739,7 @@ void cgroup_lock(void)
 {
         mutex_lock(&cgroup_mutex);
 }
+EXPORT_SYMBOL_GPL(cgroup_lock);
 
 /**
  * cgroup_unlock - release lock on cgroup changes
@@ -706,6 +750,7 @@ void cgroup_unlock(void)
 {
         mutex_unlock(&cgroup_mutex);
 }
+EXPORT_SYMBOL_GPL(cgroup_unlock);
 
 /*
  * A couple of forward declarations required, due to cyclic reference loop:
@@ -757,6 +802,7 @@ static int cgroup_call_pre_destroy(struct cgroup *cgrp)
                         if (ret)
                                 break;
                 }
+
         return ret;
 }
 
@@ -884,7 +930,11 @@ void cgroup_release_and_wakeup_rmdir(struct cgroup_subsys_state *css)
         css_put(css);
 }
 
-
+/*
+ * Call with cgroup_mutex held. Drops reference counts on modules, including
+ * any duplicate ones that parse_cgroupfs_options took. If this function
+ * returns an error, no reference counts are touched.
+ */
 static int rebind_subsystems(struct cgroupfs_root *root,
                               unsigned long final_bits)
 {
@@ -892,6 +942,8 @@ static int rebind_subsystems(struct cgroupfs_root *root,
         struct cgroup *cgrp = &root->top_cgroup;
         int i;
 
+        BUG_ON(!mutex_is_locked(&cgroup_mutex));
+
         removed_bits = root->actual_subsys_bits & ~final_bits;
         added_bits = final_bits & ~root->actual_subsys_bits;
         /* Check that any added subsystems are currently free */
@@ -900,6 +952,12 @@ static int rebind_subsystems(struct cgroupfs_root *root,
                 struct cgroup_subsys *ss = subsys[i];
                 if (!(bit & added_bits))
                         continue;
+                /*
+                 * Nobody should tell us to do a subsys that doesn't exist:
+                 * parse_cgroupfs_options should catch that case and refcounts
+                 * ensure that subsystems won't disappear once selected.
+                 */
+                BUG_ON(ss == NULL);
                 if (ss->root != &rootnode) {
                         /* Subsystem isn't free */
                         return -EBUSY;
@@ -919,6 +977,7 @@ static int rebind_subsystems(struct cgroupfs_root *root,
                 unsigned long bit = 1UL << i;
                 if (bit & added_bits) {
                         /* We're binding this subsystem to this hierarchy */
+                        BUG_ON(ss == NULL);
                         BUG_ON(cgrp->subsys[i]);
                         BUG_ON(!dummytop->subsys[i]);
                         BUG_ON(dummytop->subsys[i]->cgroup != dummytop);
@@ -930,8 +989,10 @@ static int rebind_subsystems(struct cgroupfs_root *root,
                         if (ss->bind)
                                 ss->bind(ss, cgrp);
                         mutex_unlock(&ss->hierarchy_mutex);
+                        /* refcount was already taken, and we're keeping it */
                 } else if (bit & removed_bits) {
                         /* We're removing this subsystem */
+                        BUG_ON(ss == NULL);
                         BUG_ON(cgrp->subsys[i] != dummytop->subsys[i]);
                         BUG_ON(cgrp->subsys[i]->cgroup != cgrp);
                         mutex_lock(&ss->hierarchy_mutex);
@@ -942,9 +1003,20 @@ static int rebind_subsystems(struct cgroupfs_root *root,
                         subsys[i]->root = &rootnode;
                         list_move(&ss->sibling, &rootnode.subsys_list);
                         mutex_unlock(&ss->hierarchy_mutex);
+                        /* subsystem is now free - drop reference on module */
+                        module_put(ss->module);
                 } else if (bit & final_bits) {
                         /* Subsystem state should already exist */
+                        BUG_ON(ss == NULL);
                         BUG_ON(!cgrp->subsys[i]);
+                        /*
+                         * a refcount was taken, but we already had one, so
+                         * drop the extra reference.
+                         */
+                        module_put(ss->module);
+#ifdef CONFIG_MODULE_UNLOAD
+                        BUG_ON(ss->module && !module_refcount(ss->module));
+#endif
                 } else {
                         /* Subsystem state shouldn't exist */
                         BUG_ON(cgrp->subsys[i]);
@@ -986,13 +1058,20 @@ struct cgroup_sb_opts {
 
 };
 
-/* Convert a hierarchy specifier into a bitmask of subsystems and
- * flags. */
-static int parse_cgroupfs_options(char *data,
-                                     struct cgroup_sb_opts *opts)
+/*
+ * Convert a hierarchy specifier into a bitmask of subsystems and flags. Call
+ * with cgroup_mutex held to protect the subsys[] array. This function takes
+ * refcounts on subsystems to be used, unless it returns error, in which case
+ * no refcounts are taken.
+ */
+static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
 {
         char *token, *o = data ?: "all";
         unsigned long mask = (unsigned long)-1;
+        int i;
+        bool module_pin_failed = false;
+
+        BUG_ON(!mutex_is_locked(&cgroup_mutex));
 
 #ifdef CONFIG_CPUSETS
         mask = ~(1UL << cpuset_subsys_id);
@@ -1005,10 +1084,11 @@ static int parse_cgroupfs_options(char *data,
                         return -EINVAL;
                 if (!strcmp(token, "all")) {
                         /* Add all non-disabled subsystems */
-                        int i;
                         opts->subsys_bits = 0;
                         for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
                                 struct cgroup_subsys *ss = subsys[i];
+                                if (ss == NULL)
+                                        continue;
                                 if (!ss->disabled)
                                         opts->subsys_bits |= 1ul << i;
                         }
@@ -1026,7 +1106,6 @@ static int parse_cgroupfs_options(char *data,
                         if (!opts->release_agent)
                                 return -ENOMEM;
                 } else if (!strncmp(token, "name=", 5)) {
-                        int i;
                         const char *name = token + 5;
                         /* Can't specify an empty name */
                         if (!strlen(name))
@@ -1050,9 +1129,10 @@ static int parse_cgroupfs_options(char *data,
                                 return -ENOMEM;
                 } else {
                         struct cgroup_subsys *ss;
-                        int i;
                         for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
                                 ss = subsys[i];
+                                if (ss == NULL)
+                                        continue;
                                 if (!strcmp(token, ss->name)) {
                                         if (!ss->disabled)
                                                 set_bit(i, &opts->subsys_bits);
@@ -1087,9 +1167,54 @@ static int parse_cgroupfs_options(char *data,
         if (!opts->subsys_bits && !opts->name)
                 return -EINVAL;
 
+        /*
+         * Grab references on all the modules we'll need, so the subsystems
+         * don't dance around before rebind_subsystems attaches them. This may
+         * take duplicate reference counts on a subsystem that's already used,
+         * but rebind_subsystems handles this case.
+         */
+        for (i = CGROUP_BUILTIN_SUBSYS_COUNT; i < CGROUP_SUBSYS_COUNT; i++) {
+                unsigned long bit = 1UL << i;
+
+                if (!(bit & opts->subsys_bits))
+                        continue;
+                if (!try_module_get(subsys[i]->module)) {
+                        module_pin_failed = true;
+                        break;
+                }
+        }
+        if (module_pin_failed) {
+                /*
+                 * oops, one of the modules was going away. this means that we
+                 * raced with a module_delete call, and to the user this is
+                 * essentially a "subsystem doesn't exist" case.
+                 */
+                for (i--; i >= CGROUP_BUILTIN_SUBSYS_COUNT; i--) {
+                        /* drop refcounts only on the ones we took */
+                        unsigned long bit = 1UL << i;
+
+                        if (!(bit & opts->subsys_bits))
+                                continue;
+                        module_put(subsys[i]->module);
+                }
+                return -ENOENT;
+        }
+
         return 0;
 }
 
+static void drop_parsed_module_refcounts(unsigned long subsys_bits)
+{
+        int i;
+        for (i = CGROUP_BUILTIN_SUBSYS_COUNT; i < CGROUP_SUBSYS_COUNT; i++) {
+                unsigned long bit = 1UL << i;
+
+                if (!(bit & subsys_bits))
+                        continue;
+                module_put(subsys[i]->module);
+        }
+}
+
 static int cgroup_remount(struct super_block *sb, int *flags, char *data)
 {
         int ret = 0;
@@ -1106,21 +1231,19 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
         if (ret)
                 goto out_unlock;
 
-        /* Don't allow flags to change at remount */
-        if (opts.flags != root->flags) {
-                ret = -EINVAL;
-                goto out_unlock;
-        }
-
-        /* Don't allow name to change at remount */
-        if (opts.name && strcmp(opts.name, root->name)) {
+        /* Don't allow flags or name to change at remount */
+        if (opts.flags != root->flags ||
+            (opts.name && strcmp(opts.name, root->name))) {
                 ret = -EINVAL;
+                drop_parsed_module_refcounts(opts.subsys_bits);
                 goto out_unlock;
         }
 
         ret = rebind_subsystems(root, opts.subsys_bits);
-        if (ret)
+        if (ret) {
+                drop_parsed_module_refcounts(opts.subsys_bits);
                 goto out_unlock;
+        }
 
         /* (re)populate subsystem files */
         cgroup_populate_dir(cgrp);
@@ -1151,6 +1274,8 @@ static void init_cgroup_housekeeping(struct cgroup *cgrp)
         INIT_LIST_HEAD(&cgrp->release_list);
         INIT_LIST_HEAD(&cgrp->pidlists);
         mutex_init(&cgrp->pidlist_mutex);
+        INIT_LIST_HEAD(&cgrp->event_list);
+        spin_lock_init(&cgrp->event_list_lock);
 }
 
 static void init_cgroup_root(struct cgroupfs_root *root)
@@ -1306,7 +1431,9 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
         struct cgroupfs_root *new_root;
 
         /* First find the desired set of subsystems */
+        mutex_lock(&cgroup_mutex);
         ret = parse_cgroupfs_options(data, &opts);
+        mutex_unlock(&cgroup_mutex);
         if (ret)
                 goto out_err;
 
@@ -1317,7 +1444,7 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
         new_root = cgroup_root_from_opts(&opts);
         if (IS_ERR(new_root)) {
                 ret = PTR_ERR(new_root);
-                goto out_err;
+                goto drop_modules;
         }
         opts.new_root = new_root;
 
@@ -1326,7 +1453,7 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
         if (IS_ERR(sb)) {
                 ret = PTR_ERR(sb);
                 cgroup_drop_root(opts.new_root);
-                goto out_err;
+                goto drop_modules;
         }
 
         root = sb->s_fs_info;
@@ -1382,6 +1509,11 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
                         free_cg_links(&tmp_cg_links);
                         goto drop_new_super;
                 }
+                /*
+                 * There must be no failure case after here, since rebinding
+                 * takes care of subsystems' refcounts, which are explicitly
+                 * dropped in the failure exit path.
+                 */
 
                 /* EBUSY should be the only error here */
                 BUG_ON(ret);
@@ -1420,6 +1552,8 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
                  * any) is not needed
                  */
                 cgroup_drop_root(opts.new_root);
+                /* no subsys rebinding, so refcounts don't change */
+                drop_parsed_module_refcounts(opts.subsys_bits);
         }
 
         simple_set_mnt(mnt, sb);
@@ -1429,6 +1563,8 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
 
  drop_new_super:
         deactivate_locked_super(sb);
+ drop_modules:
+        drop_parsed_module_refcounts(opts.subsys_bits);
  out_err:
         kfree(opts.release_agent);
         kfree(opts.name);
@@ -1542,6 +1678,7 @@ int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen)
         memmove(buf, start, buf + buflen - start);
         return 0;
 }
+EXPORT_SYMBOL_GPL(cgroup_path);
 
 /**
  * cgroup_attach_task - attach task 'tsk' to cgroup 'cgrp'
@@ -1554,7 +1691,7 @@ int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen)
 int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
 {
         int retval = 0;
-        struct cgroup_subsys *ss;
+        struct cgroup_subsys *ss, *failed_ss = NULL;
         struct cgroup *oldcgrp;
         struct css_set *cg;
         struct css_set *newcg;
@@ -1568,8 +1705,16 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
         for_each_subsys(root, ss) {
                 if (ss->can_attach) {
                         retval = ss->can_attach(ss, cgrp, tsk, false);
-                        if (retval)
-                                return retval;
+                        if (retval) {
+                                /*
+                                 * Remember on which subsystem the can_attach()
+                                 * failed, so that we only call cancel_attach()
+                                 * against the subsystems whose can_attach()
+                                 * succeeded. (See below)
+                                 */
+                                failed_ss = ss;
+                                goto out;
+                        }
                 }
         }
 
@@ -1583,14 +1728,17 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
          */
         newcg = find_css_set(cg, cgrp);
         put_css_set(cg);
-        if (!newcg)
-                return -ENOMEM;
+        if (!newcg) {
+                retval = -ENOMEM;
+                goto out;
+        }
 
         task_lock(tsk);
         if (tsk->flags & PF_EXITING) {
                 task_unlock(tsk);
                 put_css_set(newcg);
-                return -ESRCH;
+                retval = -ESRCH;
+                goto out;
         }
         rcu_assign_pointer(tsk->cgroups, newcg);
         task_unlock(tsk);
@@ -1616,7 +1764,22 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
          * is no longer empty.
          */
         cgroup_wakeup_rmdir_waiter(cgrp);
-        return 0;
+out:
+        if (retval) {
+                for_each_subsys(root, ss) {
+                        if (ss == failed_ss)
+                                /*
+                                 * This subsystem was the one that failed the
+                                 * can_attach() check earlier, so we don't need
+                                 * to call cancel_attach() against it or any
+                                 * remaining subsystems.
+                                 */
+                                break;
+                        if (ss->cancel_attach)
+                                ss->cancel_attach(ss, cgrp, tsk, false);
+                }
+        }
+        return retval;
 }
 
 /*
@@ -1682,6 +1845,7 @@ bool cgroup_lock_live_group(struct cgroup *cgrp)
         }
         return true;
 }
+EXPORT_SYMBOL_GPL(cgroup_lock_live_group);
 
 static int cgroup_release_agent_write(struct cgroup *cgrp, struct cftype *cft,
                                       const char *buffer)
@@ -1950,6 +2114,16 @@ static const struct inode_operations cgroup_dir_inode_operations = {
         .rename = cgroup_rename,
 };
 
+/*
+ * Check if a file is a control file
+ */
+static inline struct cftype *__file_cft(struct file *file)
+{
+        if (file->f_dentry->d_inode->i_fop != &cgroup_file_operations)
+                return ERR_PTR(-EINVAL);
+        return __d_cft(file->f_dentry);
+}
+
 static int cgroup_create_file(struct dentry *dentry, mode_t mode,
                                 struct super_block *sb)
 {
@@ -2069,6 +2243,7 @@ int cgroup_add_file(struct cgroup *cgrp,
                 error = PTR_ERR(dentry);
         return error;
 }
+EXPORT_SYMBOL_GPL(cgroup_add_file);
 
 int cgroup_add_files(struct cgroup *cgrp,
                         struct cgroup_subsys *subsys,
@@ -2083,6 +2258,7 @@ int cgroup_add_files(struct cgroup *cgrp,
         }
         return 0;
 }
+EXPORT_SYMBOL_GPL(cgroup_add_files);
 
 /**
  * cgroup_task_count - count the number of tasks in a cgroup.
@@ -2468,7 +2644,8 @@ static struct cgroup_pidlist *cgroup_pidlist_find(struct cgroup *cgrp,
 {
         struct cgroup_pidlist *l;
         /* don't need task_nsproxy() if we're looking at ourself */
-        struct pid_namespace *ns = get_pid_ns(current->nsproxy->pid_ns);
+        struct pid_namespace *ns = current->nsproxy->pid_ns;
+
         /*
          * We can't drop the pidlist_mutex before taking the l->mutex in case
          * the last ref-holder is trying to remove l from the list at the same
@@ -2478,8 +2655,6 @@ static struct cgroup_pidlist *cgroup_pidlist_find(struct cgroup *cgrp,
         mutex_lock(&cgrp->pidlist_mutex);
         list_for_each_entry(l, &cgrp->pidlists, links) {
                 if (l->key.type == type && l->key.ns == ns) {
-                        /* found a matching list - drop the extra refcount */
-                        put_pid_ns(ns);
                         /* make sure l doesn't vanish out from under us */
                         down_write(&l->mutex);
                         mutex_unlock(&cgrp->pidlist_mutex);
@@ -2490,13 +2665,12 @@ static struct cgroup_pidlist *cgroup_pidlist_find(struct cgroup *cgrp,
         l = kmalloc(sizeof(struct cgroup_pidlist), GFP_KERNEL);
         if (!l) {
                 mutex_unlock(&cgrp->pidlist_mutex);
-                put_pid_ns(ns);
                 return l;
         }
         init_rwsem(&l->mutex);
         down_write(&l->mutex);
         l->key.type = type;
-        l->key.ns = ns;
+        l->key.ns = get_pid_ns(ns);
         l->use_count = 0; /* don't increment here */
         l->list = NULL;
         l->owner = cgrp;
@@ -2804,6 +2978,174 @@ static int cgroup_write_notify_on_release(struct cgroup *cgrp,
 }
 
 /*
+ * Unregister event and free resources.
+ *
+ * Gets called from workqueue.
+ */
+static void cgroup_event_remove(struct work_struct *work)
+{
+        struct cgroup_event *event = container_of(work, struct cgroup_event,
+                        remove);
+        struct cgroup *cgrp = event->cgrp;
+
+        /* TODO: check return code */
+        event->cft->unregister_event(cgrp, event->cft, event->eventfd);
+
+        eventfd_ctx_put(event->eventfd);
+        kfree(event);
+        dput(cgrp->dentry);
+}
+
+/*
+ * Gets called on POLLHUP on eventfd when user closes it.
+ *
+ * Called with wqh->lock held and interrupts disabled.
+ */
+static int cgroup_event_wake(wait_queue_t *wait, unsigned mode,
+                int sync, void *key)
+{
+        struct cgroup_event *event = container_of(wait,
+                        struct cgroup_event, wait);
+        struct cgroup *cgrp = event->cgrp;
+        unsigned long flags = (unsigned long)key;
+
+        if (flags & POLLHUP) {
+                remove_wait_queue_locked(event->wqh, &event->wait);
+                spin_lock(&cgrp->event_list_lock);
+                list_del(&event->list);
+                spin_unlock(&cgrp->event_list_lock);
+                /*
+                 * We are in atomic context, but cgroup_event_remove() may
+                 * sleep, so we have to call it in workqueue.
+                 */
+                schedule_work(&event->remove);
+        }
+
+        return 0;
+}
+
+static void cgroup_event_ptable_queue_proc(struct file *file,
+                wait_queue_head_t *wqh, poll_table *pt)
+{
+        struct cgroup_event *event = container_of(pt,
+                        struct cgroup_event, pt);
+
+        event->wqh = wqh;
+        add_wait_queue(wqh, &event->wait);
+}
+
+/*
+ * Parse input and register new cgroup event handler.
+ *
+ * Input must be in format '<event_fd> <control_fd> <args>'.
+ * Interpretation of args is defined by control file implementation.
+ */
+static int cgroup_write_event_control(struct cgroup *cgrp, struct cftype *cft,
+                                      const char *buffer)
+{
+        struct cgroup_event *event = NULL;
+        unsigned int efd, cfd;
+        struct file *efile = NULL;
+        struct file *cfile = NULL;
+        char *endp;
+        int ret;
+
+        efd = simple_strtoul(buffer, &endp, 10);
+        if (*endp != ' ')
+                return -EINVAL;
+        buffer = endp + 1;
+
+        cfd = simple_strtoul(buffer, &endp, 10);
+        if ((*endp != ' ') && (*endp != '\0'))
+                return -EINVAL;
+        buffer = endp + 1;
+
+        event = kzalloc(sizeof(*event), GFP_KERNEL);
+        if (!event)
+                return -ENOMEM;
+        event->cgrp = cgrp;
+        INIT_LIST_HEAD(&event->list);
+        init_poll_funcptr(&event->pt, cgroup_event_ptable_queue_proc);
+        init_waitqueue_func_entry(&event->wait, cgroup_event_wake);
+        INIT_WORK(&event->remove, cgroup_event_remove);
+
+        efile = eventfd_fget(efd);
+        if (IS_ERR(efile)) {
+                ret = PTR_ERR(efile);
+                goto fail;
+        }
+
+        event->eventfd = eventfd_ctx_fileget(efile);
+        if (IS_ERR(event->eventfd)) {
+                ret = PTR_ERR(event->eventfd);
+                goto fail;
+        }
+
+        cfile = fget(cfd);
+        if (!cfile) {
+                ret = -EBADF;
+                goto fail;
+        }
+
+        /* the process need read permission on control file */
+        ret = file_permission(cfile, MAY_READ);
+        if (ret < 0)
+                goto fail;
+
+        event->cft = __file_cft(cfile);
+        if (IS_ERR(event->cft)) {
+                ret = PTR_ERR(event->cft);
+                goto fail;
+        }
+
+        if (!event->cft->register_event || !event->cft->unregister_event) {
+                ret = -EINVAL;
+                goto fail;
+        }
+
+        ret = event->cft->register_event(cgrp, event->cft,
+                        event->eventfd, buffer);
+        if (ret)
+                goto fail;
+
+        if (efile->f_op->poll(efile, &event->pt) & POLLHUP) {
+                event->cft->unregister_event(cgrp, event->cft, event->eventfd);
+                ret = 0;
+                goto fail;
+        }
+
+        /*
+         * Events should be removed after rmdir of cgroup directory, but before
+         * destroying subsystem state objects. Let's take reference to cgroup
+         * directory dentry to do that.
+         */
+        dget(cgrp->dentry);
+
+        spin_lock(&cgrp->event_list_lock);
+        list_add(&event->list, &cgrp->event_list);
+        spin_unlock(&cgrp->event_list_lock);
+
+        fput(cfile);
+        fput(efile);
+
+        return 0;
+
+fail:
+        if (cfile)
+                fput(cfile);
+
+        if (event && event->eventfd && !IS_ERR(event->eventfd))
+                eventfd_ctx_put(event->eventfd);
+
+        if (!IS_ERR_OR_NULL(efile))
+                fput(efile);
+
+        kfree(event);
+
+        return ret;
+}
+
+/*
  * for the common functions, 'private' gives the type of file
  */
 /* for hysterical raisins, we can't put this on the older files */
@@ -2828,6 +3170,11 @@ static struct cftype files[] = {
                 .read_u64 = cgroup_read_notify_on_release,
                 .write_u64 = cgroup_write_notify_on_release,
         },
+        {
+                .name = CGROUP_FILE_GENERIC_PREFIX "event_control",
+                .write_string = cgroup_write_event_control,
+                .mode = S_IWUGO,
+        },
 };
 
 static struct cftype cft_release_agent = {
@@ -2892,8 +3239,14 @@ static void cgroup_lock_hierarchy(struct cgroupfs_root *root)
         /* We need to take each hierarchy_mutex in a consistent order */
         int i;
 
+        /*
+         * No worry about a race with rebind_subsystems that might mess up the
+         * locking order, since both parties are under cgroup_mutex.
+         */
         for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
                 struct cgroup_subsys *ss = subsys[i];
+                if (ss == NULL)
+                        continue;
                 if (ss->root == root)
                         mutex_lock(&ss->hierarchy_mutex);
         }
@@ -2905,6 +3258,8 @@ static void cgroup_unlock_hierarchy(struct cgroupfs_root *root)
 
         for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
                 struct cgroup_subsys *ss = subsys[i];
+                if (ss == NULL)
+                        continue;
                 if (ss->root == root)
                         mutex_unlock(&ss->hierarchy_mutex);
         }
@@ -3028,11 +3383,16 @@ static int cgroup_has_css_refs(struct cgroup *cgrp)
          * synchronization other than RCU, and the subsystem linked
          * list isn't RCU-safe */
         int i;
+        /*
+         * We won't need to lock the subsys array, because the subsystems
+         * we're concerned about aren't going anywhere since our cgroup root
+         * has a reference on them.
+         */
         for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
                 struct cgroup_subsys *ss = subsys[i];
                 struct cgroup_subsys_state *css;
-                /* Skip subsystems not in this hierarchy */
-                if (ss->root != cgrp->root)
+                /* Skip subsystems not present or not in this hierarchy */
+                if (ss == NULL || ss->root != cgrp->root)
                         continue;
                 css = cgrp->subsys[ss->subsys_id];
                 /* When called from check_for_release() it's possible
@@ -3106,6 +3466,7 @@ static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry)
         struct dentry *d;
         struct cgroup *parent;
         DEFINE_WAIT(wait);
+        struct cgroup_event *event, *tmp;
         int ret;
 
         /* the vfs holds both inode->i_mutex already */
@@ -3189,6 +3550,20 @@ again:
         set_bit(CGRP_RELEASABLE, &parent->flags);
         check_for_release(parent);
 
+        /*
+         * Unregister events and notify userspace.
+         * Notify userspace about cgroup removing only after rmdir of cgroup
+         * directory to avoid race between userspace and kernelspace
+         */
+        spin_lock(&cgrp->event_list_lock);
+        list_for_each_entry_safe(event, tmp, &cgrp->event_list, list) {
+                list_del(&event->list);
+                remove_wait_queue(event->wqh, &event->wait);
+                eventfd_signal(event->eventfd, 1);
+                schedule_work(&event->remove);
+        }
+        spin_unlock(&cgrp->event_list_lock);
+
         mutex_unlock(&cgroup_mutex);
         return 0;
 }
@@ -3223,9 +3598,198 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
         mutex_init(&ss->hierarchy_mutex);
         lockdep_set_class(&ss->hierarchy_mutex, &ss->subsys_key);
         ss->active = 1;
+
+        /* this function shouldn't be used with modular subsystems, since they
+         * need to register a subsys_id, among other things */
+        BUG_ON(ss->module);
 }
 
 /**
+ * cgroup_load_subsys: load and register a modular subsystem at runtime
+ * @ss: the subsystem to load
+ *
+ * This function should be called in a modular subsystem's initcall. If the
+ * subsytem is built as a module, it will be assigned a new subsys_id and set
+ * up for use. If the subsystem is built-in anyway, work is delegated to the
+ * simpler cgroup_init_subsys.
+ */
+int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
+{
+        int i;
+        struct cgroup_subsys_state *css;
+
+        /* check name and function validity */
+        if (ss->name == NULL || strlen(ss->name) > MAX_CGROUP_TYPE_NAMELEN ||
+            ss->create == NULL || ss->destroy == NULL)
+                return -EINVAL;
+
+        /*
+         * we don't support callbacks in modular subsystems. this check is
+         * before the ss->module check for consistency; a subsystem that could
+         * be a module should still have no callbacks even if the user isn't
+         * compiling it as one.
+         */
+        if (ss->fork || ss->exit)
+                return -EINVAL;
+
+        /*
+         * an optionally modular subsystem is built-in: we want to do nothing,
+         * since cgroup_init_subsys will have already taken care of it.
+         */
+        if (ss->module == NULL) {
+                /* a few sanity checks */
+                BUG_ON(ss->subsys_id >= CGROUP_BUILTIN_SUBSYS_COUNT);
+                BUG_ON(subsys[ss->subsys_id] != ss);
+                return 0;
+        }
+
+        /*
+         * need to register a subsys id before anything else - for example,
+         * init_cgroup_css needs it.
+         */
+        mutex_lock(&cgroup_mutex);
+        /* find the first empty slot in the array */
+        for (i = CGROUP_BUILTIN_SUBSYS_COUNT; i < CGROUP_SUBSYS_COUNT; i++) {
+                if (subsys[i] == NULL)
+                        break;
+        }
+        if (i == CGROUP_SUBSYS_COUNT) {
+                /* maximum number of subsystems already registered! */
+                mutex_unlock(&cgroup_mutex);
+                return -EBUSY;
+        }
+        /* assign ourselves the subsys_id */
+        ss->subsys_id = i;
+        subsys[i] = ss;
+
+        /*
+         * no ss->create seems to need anything important in the ss struct, so
+         * this can happen first (i.e. before the rootnode attachment).
+         */
+        css = ss->create(ss, dummytop);
+        if (IS_ERR(css)) {
+                /* failure case - need to deassign the subsys[] slot. */
+                subsys[i] = NULL;
+                mutex_unlock(&cgroup_mutex);
+                return PTR_ERR(css);
+        }
+
+        list_add(&ss->sibling, &rootnode.subsys_list);
+        ss->root = &rootnode;
+
+        /* our new subsystem will be attached to the dummy hierarchy. */
+        init_cgroup_css(css, ss, dummytop);
+        /* init_idr must be after init_cgroup_css because it sets css->id. */
+        if (ss->use_id) {
+                int ret = cgroup_init_idr(ss, css);
+                if (ret) {
+                        dummytop->subsys[ss->subsys_id] = NULL;
+                        ss->destroy(ss, dummytop);
+                        subsys[i] = NULL;
+                        mutex_unlock(&cgroup_mutex);
+                        return ret;
+                }
+        }
+
+        /*
+         * Now we need to entangle the css into the existing css_sets. unlike
+         * in cgroup_init_subsys, there are now multiple css_sets, so each one
+         * will need a new pointer to it; done by iterating the css_set_table.
+         * furthermore, modifying the existing css_sets will corrupt the hash
+         * table state, so each changed css_set will need its hash recomputed.
+         * this is all done under the css_set_lock.
+         */
+        write_lock(&css_set_lock);
+        for (i = 0; i < CSS_SET_TABLE_SIZE; i++) {
+                struct css_set *cg;
+                struct hlist_node *node, *tmp;
+                struct hlist_head *bucket = &css_set_table[i], *new_bucket;
+
+                hlist_for_each_entry_safe(cg, node, tmp, bucket, hlist) {
+                        /* skip entries that we already rehashed */
+                        if (cg->subsys[ss->subsys_id])
+                                continue;
+                        /* remove existing entry */
+                        hlist_del(&cg->hlist);
+                        /* set new value */
+                        cg->subsys[ss->subsys_id] = css;
+                        /* recompute hash and restore entry */
+                        new_bucket = css_set_hash(cg->subsys);
+                        hlist_add_head(&cg->hlist, new_bucket);
+                }
+        }
+        write_unlock(&css_set_lock);
+
+        mutex_init(&ss->hierarchy_mutex);
+        lockdep_set_class(&ss->hierarchy_mutex, &ss->subsys_key);
+        ss->active = 1;
+
+        /* success! */
+        mutex_unlock(&cgroup_mutex);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(cgroup_load_subsys);
+
+/**
+ * cgroup_unload_subsys: unload a modular subsystem
+ * @ss: the subsystem to unload
+ *
+ * This function should be called in a modular subsystem's exitcall. When this
+ * function is invoked, the refcount on the subsystem's module will be 0, so
+ * the subsystem will not be attached to any hierarchy.
+ */
+void cgroup_unload_subsys(struct cgroup_subsys *ss)
+{
+        struct cg_cgroup_link *link;
+        struct hlist_head *hhead;
+
+        BUG_ON(ss->module == NULL);
+
+        /*
+         * we shouldn't be called if the subsystem is in use, and the use of
+         * try_module_get in parse_cgroupfs_options should ensure that it
+         * doesn't start being used while we're killing it off.
+         */
+        BUG_ON(ss->root != &rootnode);
+
+        mutex_lock(&cgroup_mutex);
+        /* deassign the subsys_id */
+        BUG_ON(ss->subsys_id < CGROUP_BUILTIN_SUBSYS_COUNT);
+        subsys[ss->subsys_id] = NULL;
+
+        /* remove subsystem from rootnode's list of subsystems */
+        list_del(&ss->sibling);
+
+        /*
+         * disentangle the css from all css_sets attached to the dummytop. as
+         * in loading, we need to pay our respects to the hashtable gods.
+         */
+        write_lock(&css_set_lock);
+        list_for_each_entry(link, &dummytop->css_sets, cgrp_link_list) {
+                struct css_set *cg = link->cg;
+
+                hlist_del(&cg->hlist);
+                BUG_ON(!cg->subsys[ss->subsys_id]);
+                cg->subsys[ss->subsys_id] = NULL;
+                hhead = css_set_hash(cg->subsys);
+                hlist_add_head(&cg->hlist, hhead);
+        }
+        write_unlock(&css_set_lock);
+
+        /*
+         * remove subsystem's css from the dummytop and free it - need to free
+         * before marking as null because ss->destroy needs the cgrp->subsys
+         * pointer to find their state. note that this also takes care of
+         * freeing the css_id.
+         */
+        ss->destroy(ss, dummytop);
+        dummytop->subsys[ss->subsys_id] = NULL;
+
+        mutex_unlock(&cgroup_mutex);
+}
+EXPORT_SYMBOL_GPL(cgroup_unload_subsys);
+
+/**
  * cgroup_init_early - cgroup initialization at system boot
  *
  * Initialize cgroups at system boot, and initialize any
@@ -3253,7 +3817,8 @@ int __init cgroup_init_early(void)
         for (i = 0; i < CSS_SET_TABLE_SIZE; i++)
                 INIT_HLIST_HEAD(&css_set_table[i]);
 
-        for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
+        /* at bootup time, we don't worry about modular subsystems */
+        for (i = 0; i < CGROUP_BUILTIN_SUBSYS_COUNT; i++) {
                 struct cgroup_subsys *ss = subsys[i];
 
                 BUG_ON(!ss->name);
@@ -3288,12 +3853,13 @@ int __init cgroup_init(void)
         if (err)
                 return err;
 
-        for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
+        /* at bootup time, we don't worry about modular subsystems */
+        for (i = 0; i < CGROUP_BUILTIN_SUBSYS_COUNT; i++) {
                 struct cgroup_subsys *ss = subsys[i];
                 if (!ss->early_init)
                         cgroup_init_subsys(ss);
                 if (ss->use_id)
-                        cgroup_subsys_init_idr(ss);
+                        cgroup_init_idr(ss, init_css_set.subsys[ss->subsys_id]);
         }
 
         /* Add init_css_set to the hash table */
@@ -3397,9 +3963,16 @@ static int proc_cgroupstats_show(struct seq_file *m, void *v)
         int i;
 
         seq_puts(m, "#subsys_name\thierarchy\tnum_cgroups\tenabled\n");
+        /*
+         * ideally we don't want subsystems moving around while we do this.
+         * cgroup_mutex is also necessary to guarantee an atomic snapshot of
+         * subsys/hierarchy state.
+         */
         mutex_lock(&cgroup_mutex);
         for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
                 struct cgroup_subsys *ss = subsys[i];
+                if (ss == NULL)
+                        continue;
                 seq_printf(m, "%s\t%d\t%d\t%d\n",
                            ss->name, ss->root->hierarchy_id,
                            ss->root->number_of_cgroups, !ss->disabled);
@@ -3457,7 +4030,12 @@ void cgroup_fork_callbacks(struct task_struct *child)
 {
         if (need_forkexit_callback) {
                 int i;
-                for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
+                /*
+                 * forkexit callbacks are only supported for builtin
+                 * subsystems, and the builtin section of the subsys array is
+                 * immutable, so we don't need to lock the subsys array here.
+                 */
+                for (i = 0; i < CGROUP_BUILTIN_SUBSYS_COUNT; i++) {
                         struct cgroup_subsys *ss = subsys[i];
                         if (ss->fork)
                                 ss->fork(ss, child);
@@ -3526,7 +4104,11 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks)
         struct css_set *cg;
 
         if (run_callbacks && need_forkexit_callback) {
-                for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
+                /*
+                 * modular subsystems can't use callbacks, so no need to lock
+                 * the subsys array
+                 */
+                for (i = 0; i < CGROUP_BUILTIN_SUBSYS_COUNT; i++) {
                         struct cgroup_subsys *ss = subsys[i];
                         if (ss->exit)
                                 ss->exit(ss, tsk);
@@ -3720,12 +4302,13 @@ static void check_for_release(struct cgroup *cgrp)
         }
 }
 
-void __css_put(struct cgroup_subsys_state *css)
+/* Caller must verify that the css is not for root cgroup */
+void __css_put(struct cgroup_subsys_state *css, int count)
 {
         struct cgroup *cgrp = css->cgroup;
         int val;
         rcu_read_lock();
-        val = atomic_dec_return(&css->refcnt);
+        val = atomic_sub_return(count, &css->refcnt);
         if (val == 1) {
                 if (notify_on_release(cgrp)) {
                         set_bit(CGRP_RELEASABLE, &cgrp->flags);
@@ -3736,6 +4319,7 @@ void __css_put(struct cgroup_subsys_state *css)
         rcu_read_unlock();
         WARN_ON_ONCE(val < 1);
 }
+EXPORT_SYMBOL_GPL(__css_put);
 
 /*
  * Notify userspace when a cgroup is released, by running the
@@ -3817,8 +4401,11 @@ static int __init cgroup_disable(char *str)
         while ((token = strsep(&str, ",")) != NULL) {
                 if (!*token)
                         continue;
-
-                for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
+                /*
+                 * cgroup_disable, being at boot time, can't know about module
+                 * subsystems, so we don't worry about them.
+                 */
+                for (i = 0; i < CGROUP_BUILTIN_SUBSYS_COUNT; i++) {
                         struct cgroup_subsys *ss = subsys[i];
 
                         if (!strcmp(token, ss->name)) {
@@ -3848,6 +4435,7 @@ unsigned short css_id(struct cgroup_subsys_state *css)
                 return cssid->id;
         return 0;
 }
+EXPORT_SYMBOL_GPL(css_id);
 
 unsigned short css_depth(struct cgroup_subsys_state *css)
 {
@@ -3857,6 +4445,7 @@ unsigned short css_depth(struct cgroup_subsys_state *css)
                 return cssid->depth;
         return 0;
 }
+EXPORT_SYMBOL_GPL(css_depth);
 
 bool css_is_ancestor(struct cgroup_subsys_state *child,
                     const struct cgroup_subsys_state *root)
@@ -3893,6 +4482,7 @@ void free_css_id(struct cgroup_subsys *ss, struct cgroup_subsys_state *css)
         spin_unlock(&ss->id_lock);
         call_rcu(&id->rcu_head, __free_css_id_cb);
 }
+EXPORT_SYMBOL_GPL(free_css_id);
 
 /*
  * This is called by init or create(). Then, calls to this function are
@@ -3942,15 +4532,14 @@ err_out:
 
 }
 
-static int __init cgroup_subsys_init_idr(struct cgroup_subsys *ss)
+static int __init_or_module cgroup_init_idr(struct cgroup_subsys *ss,
+                                            struct cgroup_subsys_state *rootcss)
 {
         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);
@@ -4010,6 +4599,7 @@ struct cgroup_subsys_state *css_lookup(struct cgroup_subsys *ss, int id)
 
         return rcu_dereference(cssid->css);
 }
+EXPORT_SYMBOL_GPL(css_lookup);
 
 /**
  * css_get_next - lookup next cgroup under specified hierarchy.
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 59e9ef6aab40..da5e13975531 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -15,6 +15,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/cgroup.h>
 #include <linux/fs.h>
 #include <linux/uaccess.h>
@@ -47,17 +48,20 @@ static inline struct freezer *task_freezer(struct task_struct *task)
                             struct freezer, css);
 }
 
-int cgroup_frozen(struct task_struct *task)
+int cgroup_freezing_or_frozen(struct task_struct *task)
 {
         struct freezer *freezer;
         enum freezer_state state;
 
         task_lock(task);
         freezer = task_freezer(task);
-        state = freezer->state;
+        if (!freezer->css.cgroup->parent)
+                state = CGROUP_THAWED; /* root cgroup can't be frozen */
+        else
+                state = freezer->state;
         task_unlock(task);
 
-        return state == CGROUP_FROZEN;
+        return (state == CGROUP_FREEZING) || (state == CGROUP_FROZEN);
 }
 
 /*
diff --git a/kernel/compat.c b/kernel/compat.c
index f6c204f07ea6..7f40e9275fd9 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -25,6 +25,7 @@
 #include <linux/posix-timers.h>
 #include <linux/times.h>
 #include <linux/ptrace.h>
+#include <linux/gfp.h>
 
 #include <asm/uaccess.h>
 
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 677f25376a38..25bba73b1be3 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -14,6 +14,7 @@
 #include <linux/kthread.h>
 #include <linux/stop_machine.h>
 #include <linux/mutex.h>
+#include <linux/gfp.h>
 
 #ifdef CONFIG_SMP
 /* Serializes the updates to cpu_online_mask, cpu_present_mask */
@@ -338,7 +339,7 @@ int __cpuinit cpu_up(unsigned int cpu)
         if (!cpu_possible(cpu)) {
                 printk(KERN_ERR "can't online cpu %d because it is not "
                         "configured as may-hotadd at boot time\n", cpu);
-#if defined(CONFIG_IA64) || defined(CONFIG_X86_64)
+#if defined(CONFIG_IA64)
                 printk(KERN_ERR "please check additional_cpus= boot "
                                 "parameter\n");
 #endif
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index ba401fab459f..d10946748ec2 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -920,9 +920,6 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
  *    call to guarantee_online_mems(), as we know no one is changing
  *    our task's cpuset.
  *
- *    Hold callback_mutex around the two modifications of our tasks
- *    mems_allowed to synchronize with cpuset_mems_allowed().
- *
  *    While the mm_struct we are migrating is typically from some
  *    other task, the task_struct mems_allowed that we are hacking
  *    is for our current task, which must allocate new pages for that
@@ -973,15 +970,20 @@ static void cpuset_change_nodemask(struct task_struct *p,
         struct cpuset *cs;
         int migrate;
         const nodemask_t *oldmem = scan->data;
-        nodemask_t newmems;
+        NODEMASK_ALLOC(nodemask_t, newmems, GFP_KERNEL);
+
+        if (!newmems)
+                return;
 
         cs = cgroup_cs(scan->cg);
-        guarantee_online_mems(cs, &newmems);
+        guarantee_online_mems(cs, newmems);
 
         task_lock(p);
-        cpuset_change_task_nodemask(p, &newmems);
+        cpuset_change_task_nodemask(p, newmems);
         task_unlock(p);
 
+        NODEMASK_FREE(newmems);
+
         mm = get_task_mm(p);
         if (!mm)
                 return;
@@ -1051,16 +1053,21 @@ static void update_tasks_nodemask(struct cpuset *cs, const nodemask_t *oldmem,
 static int update_nodemask(struct cpuset *cs, struct cpuset *trialcs,
                            const char *buf)
 {
-        nodemask_t oldmem;
+        NODEMASK_ALLOC(nodemask_t, oldmem, GFP_KERNEL);
         int retval;
         struct ptr_heap heap;
 
+        if (!oldmem)
+                return -ENOMEM;
+
         /*
          * top_cpuset.mems_allowed tracks node_stats[N_HIGH_MEMORY];
          * it's read-only
          */
-        if (cs == &top_cpuset)
-                return -EACCES;
+        if (cs == &top_cpuset) {
+                retval = -EACCES;
+                goto done;
+        }
 
         /*
          * An empty mems_allowed is ok iff there are no tasks in the cpuset.
@@ -1076,11 +1083,13 @@ static int update_nodemask(struct cpuset *cs, struct cpuset *trialcs,
                         goto done;
 
                 if (!nodes_subset(trialcs->mems_allowed,
-                                node_states[N_HIGH_MEMORY]))
-                        return -EINVAL;
+                                node_states[N_HIGH_MEMORY])) {
+                        retval =  -EINVAL;
+                        goto done;
+                }
         }
-        oldmem = cs->mems_allowed;
-        if (nodes_equal(oldmem, trialcs->mems_allowed)) {
+        *oldmem = cs->mems_allowed;
+        if (nodes_equal(*oldmem, trialcs->mems_allowed)) {
                 retval = 0;             /* Too easy - nothing to do */
                 goto done;
         }
@@ -1096,10 +1105,11 @@ static int update_nodemask(struct cpuset *cs, struct cpuset *trialcs,
         cs->mems_allowed = trialcs->mems_allowed;
         mutex_unlock(&callback_mutex);
 
-        update_tasks_nodemask(cs, &oldmem, &heap);
+        update_tasks_nodemask(cs, oldmem, &heap);
 
         heap_free(&heap);
 done:
+        NODEMASK_FREE(oldmem);
         return retval;
 }
 
@@ -1384,40 +1394,47 @@ static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cont,
                           struct cgroup *oldcont, struct task_struct *tsk,
                           bool threadgroup)
 {
-        nodemask_t from, to;
         struct mm_struct *mm;
         struct cpuset *cs = cgroup_cs(cont);
         struct cpuset *oldcs = cgroup_cs(oldcont);
+        NODEMASK_ALLOC(nodemask_t, from, GFP_KERNEL);
+        NODEMASK_ALLOC(nodemask_t, to, GFP_KERNEL);
+
+        if (from == NULL || to == NULL)
+                goto alloc_fail;
 
         if (cs == &top_cpuset) {
                 cpumask_copy(cpus_attach, cpu_possible_mask);
-                to = node_possible_map;
         } else {
                 guarantee_online_cpus(cs, cpus_attach);
-                guarantee_online_mems(cs, &to);
         }
+        guarantee_online_mems(cs, to);
 
         /* do per-task migration stuff possibly for each in the threadgroup */
-        cpuset_attach_task(tsk, &to, cs);
+        cpuset_attach_task(tsk, to, cs);
         if (threadgroup) {
                 struct task_struct *c;
                 rcu_read_lock();
                 list_for_each_entry_rcu(c, &tsk->thread_group, thread_group) {
-                        cpuset_attach_task(c, &to, cs);
+                        cpuset_attach_task(c, to, cs);
                 }
                 rcu_read_unlock();
         }
 
         /* change mm; only needs to be done once even if threadgroup */
-        from = oldcs->mems_allowed;
-        to = cs->mems_allowed;
+        *from = oldcs->mems_allowed;
+        *to = cs->mems_allowed;
         mm = get_task_mm(tsk);
         if (mm) {
-                mpol_rebind_mm(mm, &to);
+                mpol_rebind_mm(mm, to);
                 if (is_memory_migrate(cs))
-                        cpuset_migrate_mm(mm, &from, &to);
+                        cpuset_migrate_mm(mm, from, to);
                 mmput(mm);
         }
+
+alloc_fail:
+        NODEMASK_FREE(from);
+        NODEMASK_FREE(to);
 }
 
 /* The various types of files and directories in a cpuset file system */
@@ -1562,13 +1579,21 @@ static int cpuset_sprintf_cpulist(char *page, struct cpuset *cs)
 
 static int cpuset_sprintf_memlist(char *page, struct cpuset *cs)
 {
-        nodemask_t mask;
+        NODEMASK_ALLOC(nodemask_t, mask, GFP_KERNEL);
+        int retval;
+
+        if (mask == NULL)
+                return -ENOMEM;
 
         mutex_lock(&callback_mutex);
-        mask = cs->mems_allowed;
+        *mask = cs->mems_allowed;
         mutex_unlock(&callback_mutex);
 
-        return nodelist_scnprintf(page, PAGE_SIZE, mask);
+        retval = nodelist_scnprintf(page, PAGE_SIZE, *mask);
+
+        NODEMASK_FREE(mask);
+
+        return retval;
 }
 
 static ssize_t cpuset_common_file_read(struct cgroup *cont,
@@ -1997,7 +2022,10 @@ static void scan_for_empty_cpusets(struct cpuset *root)
         struct cpuset *cp;      /* scans cpusets being updated */
         struct cpuset *child;   /* scans child cpusets of cp */
         struct cgroup *cont;
-        nodemask_t oldmems;
+        NODEMASK_ALLOC(nodemask_t, oldmems, GFP_KERNEL);
+
+        if (oldmems == NULL)
+                return;
 
         list_add_tail((struct list_head *)&root->stack_list, &queue);
 
@@ -2014,7 +2042,7 @@ static void scan_for_empty_cpusets(struct cpuset *root)
                     nodes_subset(cp->mems_allowed, node_states[N_HIGH_MEMORY]))
                         continue;
 
-                oldmems = cp->mems_allowed;
+                *oldmems = cp->mems_allowed;
 
                 /* Remove offline cpus and mems from this cpuset. */
                 mutex_lock(&callback_mutex);
@@ -2030,9 +2058,10 @@ 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, NULL);
+                        update_tasks_nodemask(cp, oldmems, NULL);
                 }
         }
+        NODEMASK_FREE(oldmems);
 }
 
 /*
@@ -2090,20 +2119,33 @@ static int cpuset_track_online_cpus(struct notifier_block *unused_nb,
 static int cpuset_track_online_nodes(struct notifier_block *self,
                                 unsigned long action, void *arg)
 {
+        NODEMASK_ALLOC(nodemask_t, oldmems, GFP_KERNEL);
+
+        if (oldmems == NULL)
+                return NOTIFY_DONE;
+
         cgroup_lock();
         switch (action) {
         case MEM_ONLINE:
-        case MEM_OFFLINE:
+                *oldmems = top_cpuset.mems_allowed;
                 mutex_lock(&callback_mutex);
                 top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
                 mutex_unlock(&callback_mutex);
-                if (action == MEM_OFFLINE)
-                        scan_for_empty_cpusets(&top_cpuset);
+                update_tasks_nodemask(&top_cpuset, oldmems, NULL);
+                break;
+        case MEM_OFFLINE:
+                /*
+                 * needn't update top_cpuset.mems_allowed explicitly because
+                 * scan_for_empty_cpusets() will update it.
+                 */
+                scan_for_empty_cpusets(&top_cpuset);
                 break;
         default:
                 break;
         }
         cgroup_unlock();
+
+        NODEMASK_FREE(oldmems);
         return NOTIFY_OK;
 }
 #endif
diff --git a/kernel/cred.c b/kernel/cred.c
index 1ed8ca18790c..62af1816c235 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -10,6 +10,7 @@
  */
 #include <linux/module.h>
 #include <linux/cred.h>
+#include <linux/slab.h>
 #include <linux/sched.h>
 #include <linux/key.h>
 #include <linux/keyctl.h>
@@ -364,7 +365,7 @@ struct cred *prepare_usermodehelper_creds(void)
 
         new = kmem_cache_alloc(cred_jar, GFP_ATOMIC);
         if (!new)
-                return NULL;
+                goto free_tgcred;
 
         kdebug("prepare_usermodehelper_creds() alloc %p", new);
 
@@ -398,6 +399,12 @@ struct cred *prepare_usermodehelper_creds(void)
 error:
         put_cred(new);
         return NULL;
+
+free_tgcred:
+#ifdef CONFIG_KEYS
+        kfree(tgcred);
+#endif
+        return NULL;
 }
 
 /*
@@ -786,8 +793,6 @@ bool creds_are_invalid(const struct cred *cred)
 {
         if (cred->magic != CRED_MAGIC)
                 return true;
-        if (atomic_read(&cred->usage) < atomic_read(&cred->subscribers))
-                return true;
 #ifdef CONFIG_SECURITY_SELINUX
         if (selinux_is_enabled()) {
                 if ((unsigned long) cred->security < PAGE_SIZE)
diff --git a/kernel/early_res.c b/kernel/early_res.c
index 3cb2c661bb78..31aa9332ef3f 100644
--- a/kernel/early_res.c
+++ b/kernel/early_res.c
@@ -333,6 +333,12 @@ void __init free_early_partial(u64 start, u64 end)
         struct early_res *r;
         int i;
 
+        if (start == end)
+                return;
+
+        if (WARN_ONCE(start > end, "  wrong range [%#llx, %#llx]\n", start, end))
+                return;
+
 try_next:
         i = find_overlapped_early(start, end);
         if (i >= max_early_res)
diff --git a/kernel/elfcore.c b/kernel/elfcore.c
new file mode 100644
index 000000000000..ff915efef66d
--- /dev/null
+++ b/kernel/elfcore.c
@@ -0,0 +1,28 @@
+#include <linux/elf.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+
+#include <asm/elf.h>
+
+
+Elf_Half __weak elf_core_extra_phdrs(void)
+{
+        return 0;
+}
+
+int __weak elf_core_write_extra_phdrs(struct file *file, loff_t offset, size_t *size,
+                                      unsigned long limit)
+{
+        return 1;
+}
+
+int __weak elf_core_write_extra_data(struct file *file, size_t *size,
+                                     unsigned long limit)
+{
+        return 1;
+}
+
+size_t __weak elf_core_extra_data_size(void)
+{
+        return 0;
+}
diff --git a/kernel/exit.c b/kernel/exit.c
index 45ed043b8bf5..7f2683a10ac4 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -87,7 +87,7 @@ static void __exit_signal(struct task_struct *tsk)
 
         sighand = rcu_dereference_check(tsk->sighand,
                                         rcu_read_lock_held() ||
-                                        lockdep_is_held(&tasklist_lock));
+                                        lockdep_tasklist_lock_is_held());
         spin_lock(&sighand->siglock);
 
         posix_cpu_timers_exit(tsk);
@@ -952,7 +952,9 @@ NORET_TYPE void do_exit(long code)
                                 preempt_count());
 
         acct_update_integrals(tsk);
-
+        /* sync mm's RSS info before statistics gathering */
+        if (tsk->mm)
+                sync_mm_rss(tsk, tsk->mm);
         group_dead = atomic_dec_and_test(&tsk->signal->live);
         if (group_dead) {
                 hrtimer_cancel(&tsk->signal->real_timer);
@@ -1188,7 +1190,7 @@ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
 
         if (unlikely(wo->wo_flags & WNOWAIT)) {
                 int exit_code = p->exit_code;
-                int why, status;
+                int why;
 
                 get_task_struct(p);
                 read_unlock(&tasklist_lock);
diff --git a/kernel/fork.c b/kernel/fork.c
index 17bbf093356d..44b0791b0a2e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -86,7 +86,14 @@ int max_threads;		/* tunable limit on nr_threads */
 DEFINE_PER_CPU(unsigned long, process_counts) = 0;
 
 __cacheline_aligned DEFINE_RWLOCK(tasklist_lock);  /* outer */
-EXPORT_SYMBOL_GPL(tasklist_lock);
+
+#ifdef CONFIG_PROVE_RCU
+int lockdep_tasklist_lock_is_held(void)
+{
+        return lockdep_is_held(&tasklist_lock);
+}
+EXPORT_SYMBOL_GPL(lockdep_tasklist_lock_is_held);
+#endif /* #ifdef CONFIG_PROVE_RCU */
 
 int nr_processes(void)
 {
@@ -329,15 +336,17 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
                 if (!tmp)
                         goto fail_nomem;
                 *tmp = *mpnt;
+                INIT_LIST_HEAD(&tmp->anon_vma_chain);
                 pol = mpol_dup(vma_policy(mpnt));
                 retval = PTR_ERR(pol);
                 if (IS_ERR(pol))
                         goto fail_nomem_policy;
                 vma_set_policy(tmp, pol);
+                if (anon_vma_fork(tmp, mpnt))
+                        goto fail_nomem_anon_vma_fork;
                 tmp->vm_flags &= ~VM_LOCKED;
                 tmp->vm_mm = mm;
                 tmp->vm_next = NULL;
-                anon_vma_link(tmp);
                 file = tmp->vm_file;
                 if (file) {
                         struct inode *inode = file->f_path.dentry->d_inode;
@@ -392,6 +401,8 @@ out:
         flush_tlb_mm(oldmm);
         up_write(&oldmm->mmap_sem);
         return retval;
+fail_nomem_anon_vma_fork:
+        mpol_put(pol);
 fail_nomem_policy:
         kmem_cache_free(vm_area_cachep, tmp);
 fail_nomem:
@@ -455,8 +466,7 @@ static struct mm_struct * mm_init(struct mm_struct * mm, struct task_struct *p)
                 (current->mm->flags & MMF_INIT_MASK) : default_dump_filter;
         mm->core_state = NULL;
         mm->nr_ptes = 0;
-        set_mm_counter(mm, file_rss, 0);
-        set_mm_counter(mm, anon_rss, 0);
+        memset(&mm->rss_stat, 0, sizeof(mm->rss_stat));
         spin_lock_init(&mm->page_table_lock);
         mm->free_area_cache = TASK_UNMAPPED_BASE;
         mm->cached_hole_size = ~0UL;
@@ -825,23 +835,14 @@ void __cleanup_sighand(struct sighand_struct *sighand)
  */
 static void posix_cpu_timers_init_group(struct signal_struct *sig)
 {
+        unsigned long cpu_limit;
+
         /* Thread group counters. */
         thread_group_cputime_init(sig);
 
-        /* Expiration times and increments. */
-        sig->it[CPUCLOCK_PROF].expires = cputime_zero;
-        sig->it[CPUCLOCK_PROF].incr = cputime_zero;
-        sig->it[CPUCLOCK_VIRT].expires = cputime_zero;
-        sig->it[CPUCLOCK_VIRT].incr = cputime_zero;
-
-        /* Cached expiration times. */
-        sig->cputime_expires.prof_exp = cputime_zero;
-        sig->cputime_expires.virt_exp = cputime_zero;
-        sig->cputime_expires.sched_exp = 0;
-
-        if (sig->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
-                sig->cputime_expires.prof_exp =
-                        secs_to_cputime(sig->rlim[RLIMIT_CPU].rlim_cur);
+        cpu_limit = ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_cur);
+        if (cpu_limit != RLIM_INFINITY) {
+                sig->cputime_expires.prof_exp = secs_to_cputime(cpu_limit);
                 sig->cputimer.running = 1;
         }
 
@@ -858,7 +859,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
         if (clone_flags & CLONE_THREAD)
                 return 0;
 
-        sig = kmem_cache_alloc(signal_cachep, GFP_KERNEL);
+        sig = kmem_cache_zalloc(signal_cachep, GFP_KERNEL);
         tsk->signal = sig;
         if (!sig)
                 return -ENOMEM;
@@ -866,46 +867,21 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
         atomic_set(&sig->count, 1);
         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;
         sig->curr_target = tsk;
         init_sigpending(&sig->shared_pending);
         INIT_LIST_HEAD(&sig->posix_timers);
 
         hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-        sig->it_real_incr.tv64 = 0;
         sig->real_timer.function = it_real_fn;
 
-        sig->leader = 0;        /* session leadership doesn't inherit */
-        sig->tty_old_pgrp = NULL;
-        sig->tty = NULL;
-
-        sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
-        sig->gtime = cputime_zero;
-        sig->cgtime = cputime_zero;
-#ifndef CONFIG_VIRT_CPU_ACCOUNTING
-        sig->prev_utime = sig->prev_stime = cputime_zero;
-#endif
-        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;
-        sig->maxrss = sig->cmaxrss = 0;
-        task_io_accounting_init(&sig->ioac);
-        sig->sum_sched_runtime = 0;
-        taskstats_tgid_init(sig);
-
         task_lock(current->group_leader);
         memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim);
         task_unlock(current->group_leader);
 
         posix_cpu_timers_init_group(sig);
 
-        acct_init_pacct(&sig->pacct);
-
         tty_audit_fork(sig);
 
         sig->oom_adj = current->signal->oom_adj;
@@ -1034,7 +1010,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #endif
         retval = -EAGAIN;
         if (atomic_read(&p->real_cred->user->processes) >=
-                        p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
+                        task_rlimit(p, RLIMIT_NPROC)) {
                 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
                     p->real_cred->user != INIT_USER)
                         goto bad_fork_free;
@@ -1076,6 +1052,9 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         p->prev_utime = cputime_zero;
         p->prev_stime = cputime_zero;
 #endif
+#if defined(SPLIT_RSS_COUNTING)
+        memset(&p->rss_stat, 0, sizeof(p->rss_stat));
+#endif
 
         p->default_timer_slack_ns = current->timer_slack_ns;
 
diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index 967e66143e11..03808ed342a6 100644
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -413,17 +413,17 @@ EXPORT_SYMBOL_GPL(unregister_hw_breakpoint);
  *
  * @return a set of per_cpu pointers to perf events
  */
-struct perf_event **
+struct perf_event * __percpu *
 register_wide_hw_breakpoint(struct perf_event_attr *attr,
                             perf_overflow_handler_t triggered)
 {
-        struct perf_event **cpu_events, **pevent, *bp;
+        struct perf_event * __percpu *cpu_events, **pevent, *bp;
         long err;
         int cpu;
 
         cpu_events = alloc_percpu(typeof(*cpu_events));
         if (!cpu_events)
-                return ERR_PTR(-ENOMEM);
+                return (void __percpu __force *)ERR_PTR(-ENOMEM);
 
         get_online_cpus();
         for_each_online_cpu(cpu) {
@@ -451,7 +451,7 @@ fail:
         put_online_cpus();
 
         free_percpu(cpu_events);
-        return ERR_PTR(err);
+        return (void __percpu __force *)ERR_PTR(err);
 }
 EXPORT_SYMBOL_GPL(register_wide_hw_breakpoint);
 
@@ -459,7 +459,7 @@ EXPORT_SYMBOL_GPL(register_wide_hw_breakpoint);
  * unregister_wide_hw_breakpoint - unregister a wide breakpoint in the kernel
  * @cpu_events: the per cpu set of events to unregister
  */
-void unregister_wide_hw_breakpoint(struct perf_event **cpu_events)
+void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events)
 {
         int cpu;
         struct perf_event **pevent;
@@ -489,5 +489,4 @@ struct pmu perf_ops_bp = {
         .enable         = arch_install_hw_breakpoint,
         .disable        = arch_uninstall_hw_breakpoint,
         .read           = hw_breakpoint_pmu_read,
-        .unthrottle     = hw_breakpoint_pmu_unthrottle
 };
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index d70394f12ee9..b7091d5ca2f8 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -359,6 +359,23 @@ static inline void mask_ack_irq(struct irq_desc *desc, int irq)
                 if (desc->chip->ack)
                         desc->chip->ack(irq);
         }
+        desc->status |= IRQ_MASKED;
+}
+
+static inline void mask_irq(struct irq_desc *desc, int irq)
+{
+        if (desc->chip->mask) {
+                desc->chip->mask(irq);
+                desc->status |= IRQ_MASKED;
+        }
+}
+
+static inline void unmask_irq(struct irq_desc *desc, int irq)
+{
+        if (desc->chip->unmask) {
+                desc->chip->unmask(irq);
+                desc->status &= ~IRQ_MASKED;
+        }
 }
 
 /*
@@ -484,10 +501,8 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc)
         raw_spin_lock(&desc->lock);
         desc->status &= ~IRQ_INPROGRESS;
 
-        if (unlikely(desc->status & IRQ_ONESHOT))
-                desc->status |= IRQ_MASKED;
-        else if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask)
-                desc->chip->unmask(irq);
+        if (!(desc->status & (IRQ_DISABLED | IRQ_ONESHOT)))
+                unmask_irq(desc, irq);
 out_unlock:
         raw_spin_unlock(&desc->lock);
 }
@@ -524,8 +539,7 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
         action = desc->action;
         if (unlikely(!action || (desc->status & IRQ_DISABLED))) {
                 desc->status |= IRQ_PENDING;
-                if (desc->chip->mask)
-                        desc->chip->mask(irq);
+                mask_irq(desc, irq);
                 goto out;
         }
 
@@ -554,7 +568,7 @@ out:
  *      signal. The occurence is latched into the irq controller hardware
  *      and must be acked in order to be reenabled. After the ack another
  *      interrupt can happen on the same source even before the first one
- *      is handled by the assosiacted event handler. If this happens it
+ *      is handled by the associated event handler. If this happens it
  *      might be necessary to disable (mask) the interrupt depending on the
  *      controller hardware. This requires to reenable the interrupt inside
  *      of the loop which handles the interrupts which have arrived while
@@ -593,7 +607,7 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
                 irqreturn_t action_ret;
 
                 if (unlikely(!action)) {
-                        desc->chip->mask(irq);
+                        mask_irq(desc, irq);
                         goto out_unlock;
                 }
 
@@ -605,8 +619,7 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
                 if (unlikely((desc->status &
                                (IRQ_PENDING | IRQ_MASKED | IRQ_DISABLED)) ==
                               (IRQ_PENDING | IRQ_MASKED))) {
-                        desc->chip->unmask(irq);
-                        desc->status &= ~IRQ_MASKED;
+                        unmask_irq(desc, irq);
                 }
 
                 desc->status &= ~IRQ_PENDING;
@@ -716,7 +729,7 @@ set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
         __set_irq_handler(irq, handle, 0, name);
 }
 
-void __init set_irq_noprobe(unsigned int irq)
+void set_irq_noprobe(unsigned int irq)
 {
         struct irq_desc *desc = irq_to_desc(irq);
         unsigned long flags;
@@ -731,7 +744,7 @@ void __init set_irq_noprobe(unsigned int irq)
         raw_spin_unlock_irqrestore(&desc->lock, flags);
 }
 
-void __init set_irq_probe(unsigned int irq)
+void set_irq_probe(unsigned int irq)
 {
         struct irq_desc *desc = irq_to_desc(irq);
         unsigned long flags;
diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
index d06df9c41cba..1ef4ffcdfa55 100644
--- a/kernel/irq/devres.c
+++ b/kernel/irq/devres.c
@@ -42,7 +42,7 @@ static int devm_irq_match(struct device *dev, void *res, void *data)
  *      automatically freed on driver detach.
  *
  *      If an IRQ allocated with this function needs to be freed
- *      separately, dev_free_irq() must be used.
+ *      separately, devm_free_irq() must be used.
  */
 int devm_request_threaded_irq(struct device *dev, unsigned int irq,
                               irq_handler_t handler, irq_handler_t thread_fn,
@@ -81,7 +81,7 @@ EXPORT_SYMBOL(devm_request_threaded_irq);
  *      Except for the extra @dev argument, this function takes the
  *      same arguments and performs the same function as free_irq().
  *      This function instead of free_irq() should be used to manually
- *      free IRQs allocated with dev_request_irq().
+ *      free IRQs allocated with devm_request_irq().
  */
 void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
 {
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index eb6078ca60c7..704e488730a5 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -382,6 +382,7 @@ int can_request_irq(unsigned int irq, unsigned long irqflags)
 {
         struct irq_desc *desc = irq_to_desc(irq);
         struct irqaction *action;
+        unsigned long flags;
 
         if (!desc)
                 return 0;
@@ -389,11 +390,14 @@ int can_request_irq(unsigned int irq, unsigned long irqflags)
         if (desc->status & IRQ_NOREQUEST)
                 return 0;
 
+        raw_spin_lock_irqsave(&desc->lock, flags);
         action = desc->action;
         if (action)
                 if (irqflags & action->flags & IRQF_SHARED)
                         action = NULL;
 
+        raw_spin_unlock_irqrestore(&desc->lock, flags);
+
         return !action;
 }
 
@@ -483,8 +487,26 @@ static int irq_wait_for_interrupt(struct irqaction *action)
  */
 static void irq_finalize_oneshot(unsigned int irq, struct irq_desc *desc)
 {
+again:
         chip_bus_lock(irq, desc);
         raw_spin_lock_irq(&desc->lock);
+
+        /*
+         * Implausible though it may be we need to protect us against
+         * the following scenario:
+         *
+         * The thread is faster done than the hard interrupt handler
+         * on the other CPU. If we unmask the irq line then the
+         * interrupt can come in again and masks the line, leaves due
+         * to IRQ_INPROGRESS and the irq line is masked forever.
+         */
+        if (unlikely(desc->status & IRQ_INPROGRESS)) {
+                raw_spin_unlock_irq(&desc->lock);
+                chip_bus_sync_unlock(irq, desc);
+                cpu_relax();
+                goto again;
+        }
+
         if (!(desc->status & IRQ_DISABLED) && (desc->status & IRQ_MASKED)) {
                 desc->status &= ~IRQ_MASKED;
                 desc->chip->unmask(irq);
@@ -735,6 +757,16 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
                 if (new->flags & IRQF_ONESHOT)
                         desc->status |= IRQ_ONESHOT;
 
+                /*
+                 * Force MSI interrupts to run with interrupts
+                 * disabled. The multi vector cards can cause stack
+                 * overflows due to nested interrupts when enough of
+                 * them are directed to a core and fire at the same
+                 * time.
+                 */
+                if (desc->msi_desc)
+                        new->flags |= IRQF_DISABLED;
+
                 if (!(desc->status & IRQ_NOAUTOEN)) {
                         desc->depth = 0;
                         desc->status &= ~IRQ_DISABLED;
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
index 963559dbd858..65d3845665ac 100644
--- a/kernel/irq/numa_migrate.c
+++ b/kernel/irq/numa_migrate.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/irq.h>
+#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/random.h>
 #include <linux/interrupt.h>
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 6f50eccc79c0..7a6eb04ef6b5 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/irq.h>
+#include <linux/gfp.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/interrupt.h>
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 8e5288a8a355..13aff293f4de 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -21,6 +21,7 @@
 #include <linux/sched.h>        /* for cond_resched */
 #include <linux/mm.h>
 #include <linux/ctype.h>
+#include <linux/slab.h>
 
 #include <asm/sections.h>
 
diff --git a/kernel/kgdb.c b/kernel/kgdb.c
index 761fdd2b3034..11f3515ca83f 100644
--- a/kernel/kgdb.c
+++ b/kernel/kgdb.c
@@ -69,9 +69,16 @@ struct kgdb_state {
         struct pt_regs          *linux_regs;
 };
 
+/* Exception state values */
+#define DCPU_WANT_MASTER 0x1 /* Waiting to become a master kgdb cpu */
+#define DCPU_NEXT_MASTER 0x2 /* Transition from one master cpu to another */
+#define DCPU_IS_SLAVE    0x4 /* Slave cpu enter exception */
+#define DCPU_SSTEP       0x8 /* CPU is single stepping */
+
 static struct debuggerinfo_struct {
         void                    *debuggerinfo;
         struct task_struct      *task;
+        int                     exception_state;
 } kgdb_info[NR_CPUS];
 
 /**
@@ -391,27 +398,22 @@ int kgdb_mem2hex(char *mem, char *buf, int count)
 
 /*
  * Copy the binary array pointed to by buf into mem.  Fix $, #, and
- * 0x7d escaped with 0x7d.  Return a pointer to the character after
- * the last byte written.
+ * 0x7d escaped with 0x7d. Return -EFAULT on failure or 0 on success.
+ * The input buf is overwitten with the result to write to mem.
  */
 static int kgdb_ebin2mem(char *buf, char *mem, int count)
 {
-        int err = 0;
-        char c;
+        int size = 0;
+        char *c = buf;
 
         while (count-- > 0) {
-                c = *buf++;
-                if (c == 0x7d)
-                        c = *buf++ ^ 0x20;
-
-                err = probe_kernel_write(mem, &c, 1);
-                if (err)
-                        break;
-
-                mem++;
+                c[size] = *buf++;
+                if (c[size] == 0x7d)
+                        c[size] = *buf++ ^ 0x20;
+                size++;
         }
 
-        return err;
+        return probe_kernel_write(mem, c, size);
 }
 
 /*
@@ -563,49 +565,6 @@ static struct task_struct *getthread(struct pt_regs *regs, int tid)
 }
 
 /*
- * CPU debug state control:
- */
-
-#ifdef CONFIG_SMP
-static void kgdb_wait(struct pt_regs *regs)
-{
-        unsigned long flags;
-        int cpu;
-
-        local_irq_save(flags);
-        cpu = raw_smp_processor_id();
-        kgdb_info[cpu].debuggerinfo = regs;
-        kgdb_info[cpu].task = current;
-        /*
-         * Make sure the above info reaches the primary CPU before
-         * our cpu_in_kgdb[] flag setting does:
-         */
-        smp_wmb();
-        atomic_set(&cpu_in_kgdb[cpu], 1);
-
-        /* Disable any cpu specific hw breakpoints */
-        kgdb_disable_hw_debug(regs);
-
-        /* Wait till primary CPU is done with debugging */
-        while (atomic_read(&passive_cpu_wait[cpu]))
-                cpu_relax();
-
-        kgdb_info[cpu].debuggerinfo = NULL;
-        kgdb_info[cpu].task = NULL;
-
-        /* fix up hardware debug registers on local cpu */
-        if (arch_kgdb_ops.correct_hw_break)
-                arch_kgdb_ops.correct_hw_break();
-
-        /* Signal the primary CPU that we are done: */
-        atomic_set(&cpu_in_kgdb[cpu], 0);
-        touch_softlockup_watchdog_sync();
-        clocksource_touch_watchdog();
-        local_irq_restore(flags);
-}
-#endif
-
-/*
  * Some architectures need cache flushes when we set/clear a
  * breakpoint:
  */
@@ -1400,34 +1359,13 @@ static int kgdb_reenter_check(struct kgdb_state *ks)
         return 1;
 }
 
-/*
- * kgdb_handle_exception() - main entry point from a kernel exception
- *
- * Locking hierarchy:
- *      interface locks, if any (begin_session)
- *      kgdb lock (kgdb_active)
- */
-int
-kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
+static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs)
 {
-        struct kgdb_state kgdb_var;
-        struct kgdb_state *ks = &kgdb_var;
         unsigned long flags;
         int sstep_tries = 100;
         int error = 0;
         int i, cpu;
-
-        ks->cpu                 = raw_smp_processor_id();
-        ks->ex_vector           = evector;
-        ks->signo               = signo;
-        ks->ex_vector           = evector;
-        ks->err_code            = ecode;
-        ks->kgdb_usethreadid    = 0;
-        ks->linux_regs          = regs;
-
-        if (kgdb_reenter_check(ks))
-                return 0; /* Ouch, double exception ! */
-
+        int trace_on = 0;
 acquirelock:
         /*
          * Interrupts will be restored by the 'trap return' code, except when
@@ -1435,13 +1373,43 @@ acquirelock:
          */
         local_irq_save(flags);
 
-        cpu = raw_smp_processor_id();
+        cpu = ks->cpu;
+        kgdb_info[cpu].debuggerinfo = regs;
+        kgdb_info[cpu].task = current;
+        /*
+         * Make sure the above info reaches the primary CPU before
+         * our cpu_in_kgdb[] flag setting does:
+         */
+        atomic_inc(&cpu_in_kgdb[cpu]);
 
         /*
-         * Acquire the kgdb_active lock:
+         * CPU will loop if it is a slave or request to become a kgdb
+         * master cpu and acquire the kgdb_active lock:
          */
-        while (atomic_cmpxchg(&kgdb_active, -1, cpu) != -1)
+        while (1) {
+                if (kgdb_info[cpu].exception_state & DCPU_WANT_MASTER) {
+                        if (atomic_cmpxchg(&kgdb_active, -1, cpu) == cpu)
+                                break;
+                } else if (kgdb_info[cpu].exception_state & DCPU_IS_SLAVE) {
+                        if (!atomic_read(&passive_cpu_wait[cpu]))
+                                goto return_normal;
+                } else {
+return_normal:
+                        /* Return to normal operation by executing any
+                         * hw breakpoint fixup.
+                         */
+                        if (arch_kgdb_ops.correct_hw_break)
+                                arch_kgdb_ops.correct_hw_break();
+                        if (trace_on)
+                                tracing_on();
+                        atomic_dec(&cpu_in_kgdb[cpu]);
+                        touch_softlockup_watchdog_sync();
+                        clocksource_touch_watchdog();
+                        local_irq_restore(flags);
+                        return 0;
+                }
                 cpu_relax();
+        }
 
         /*
          * For single stepping, try to only enter on the processor
@@ -1475,9 +1443,6 @@ acquirelock:
         if (kgdb_io_ops->pre_exception)
                 kgdb_io_ops->pre_exception();
 
-        kgdb_info[ks->cpu].debuggerinfo = ks->linux_regs;
-        kgdb_info[ks->cpu].task = current;
-
         kgdb_disable_hw_debug(ks->linux_regs);
 
         /*
@@ -1486,15 +1451,9 @@ acquirelock:
          */
         if (!kgdb_single_step) {
                 for (i = 0; i < NR_CPUS; i++)
-                        atomic_set(&passive_cpu_wait[i], 1);
+                        atomic_inc(&passive_cpu_wait[i]);
         }
 
-        /*
-         * spin_lock code is good enough as a barrier so we don't
-         * need one here:
-         */
-        atomic_set(&cpu_in_kgdb[ks->cpu], 1);
-
 #ifdef CONFIG_SMP
         /* Signal the other CPUs to enter kgdb_wait() */
         if ((!kgdb_single_step) && kgdb_do_roundup)
@@ -1518,6 +1477,9 @@ acquirelock:
         kgdb_single_step = 0;
         kgdb_contthread = current;
         exception_level = 0;
+        trace_on = tracing_is_on();
+        if (trace_on)
+                tracing_off();
 
         /* Talk to debugger with gdbserial protocol */
         error = gdb_serial_stub(ks);
@@ -1526,13 +1488,11 @@ acquirelock:
         if (kgdb_io_ops->post_exception)
                 kgdb_io_ops->post_exception();
 
-        kgdb_info[ks->cpu].debuggerinfo = NULL;
-        kgdb_info[ks->cpu].task = NULL;
-        atomic_set(&cpu_in_kgdb[ks->cpu], 0);
+        atomic_dec(&cpu_in_kgdb[ks->cpu]);
 
         if (!kgdb_single_step) {
                 for (i = NR_CPUS-1; i >= 0; i--)
-                        atomic_set(&passive_cpu_wait[i], 0);
+                        atomic_dec(&passive_cpu_wait[i]);
                 /*
                  * Wait till all the CPUs have quit
                  * from the debugger.
@@ -1551,6 +1511,8 @@ kgdb_restore:
                 else
                         kgdb_sstep_pid = 0;
         }
+        if (trace_on)
+                tracing_on();
         /* Free kgdb_active */
         atomic_set(&kgdb_active, -1);
         touch_softlockup_watchdog_sync();
@@ -1560,13 +1522,52 @@ kgdb_restore:
         return error;
 }
 
+/*
+ * kgdb_handle_exception() - main entry point from a kernel exception
+ *
+ * Locking hierarchy:
+ *      interface locks, if any (begin_session)
+ *      kgdb lock (kgdb_active)
+ */
+int
+kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
+{
+        struct kgdb_state kgdb_var;
+        struct kgdb_state *ks = &kgdb_var;
+        int ret;
+
+        ks->cpu                 = raw_smp_processor_id();
+        ks->ex_vector           = evector;
+        ks->signo               = signo;
+        ks->ex_vector           = evector;
+        ks->err_code            = ecode;
+        ks->kgdb_usethreadid    = 0;
+        ks->linux_regs          = regs;
+
+        if (kgdb_reenter_check(ks))
+                return 0; /* Ouch, double exception ! */
+        kgdb_info[ks->cpu].exception_state |= DCPU_WANT_MASTER;
+        ret = kgdb_cpu_enter(ks, regs);
+        kgdb_info[ks->cpu].exception_state &= ~DCPU_WANT_MASTER;
+        return ret;
+}
+
 int kgdb_nmicallback(int cpu, void *regs)
 {
 #ifdef CONFIG_SMP
+        struct kgdb_state kgdb_var;
+        struct kgdb_state *ks = &kgdb_var;
+
+        memset(ks, 0, sizeof(struct kgdb_state));
+        ks->cpu                 = cpu;
+        ks->linux_regs          = regs;
+
         if (!atomic_read(&cpu_in_kgdb[cpu]) &&
-                        atomic_read(&kgdb_active) != cpu &&
-                        atomic_read(&cpu_in_kgdb[atomic_read(&kgdb_active)])) {
-                kgdb_wait((struct pt_regs *)regs);
+            atomic_read(&kgdb_active) != -1 &&
+            atomic_read(&kgdb_active) != cpu) {
+                kgdb_info[cpu].exception_state |= DCPU_IS_SLAVE;
+                kgdb_cpu_enter(ks, regs);
+                kgdb_info[cpu].exception_state &= ~DCPU_IS_SLAVE;
                 return 0;
         }
 #endif
@@ -1742,11 +1743,11 @@ EXPORT_SYMBOL_GPL(kgdb_unregister_io_module);
  */
 void kgdb_breakpoint(void)
 {
-        atomic_set(&kgdb_setting_breakpoint, 1);
+        atomic_inc(&kgdb_setting_breakpoint);
         wmb(); /* Sync point before breakpoint */
         arch_kgdb_breakpoint();
         wmb(); /* Sync point after breakpoint */
-        atomic_set(&kgdb_setting_breakpoint, 0);
+        atomic_dec(&kgdb_setting_breakpoint);
 }
 EXPORT_SYMBOL_GPL(kgdb_breakpoint);
 
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index ccec774c716d..0ed46f3e51e9 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -42,9 +42,11 @@
 #include <linux/freezer.h>
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
+#include <linux/sysctl.h>
 #include <linux/kdebug.h>
 #include <linux/memory.h>
 #include <linux/ftrace.h>
+#include <linux/cpu.h>
 
 #include <asm-generic/sections.h>
 #include <asm/cacheflush.h>
@@ -105,57 +107,74 @@ static struct kprobe_blackpoint kprobe_blacklist[] = {
  * stepping on the instruction on a vmalloced/kmalloced/data page
  * is a recipe for disaster
  */
-#define INSNS_PER_PAGE  (PAGE_SIZE/(MAX_INSN_SIZE * sizeof(kprobe_opcode_t)))
-
 struct kprobe_insn_page {
         struct list_head list;
         kprobe_opcode_t *insns;         /* Page of instruction slots */
-        char slot_used[INSNS_PER_PAGE];
         int nused;
         int ngarbage;
+        char slot_used[];
+};
+
+#define KPROBE_INSN_PAGE_SIZE(slots)                    \
+        (offsetof(struct kprobe_insn_page, slot_used) + \
+         (sizeof(char) * (slots)))
+
+struct kprobe_insn_cache {
+        struct list_head pages; /* list of kprobe_insn_page */
+        size_t insn_size;       /* size of instruction slot */
+        int nr_garbage;
 };
 
+static int slots_per_page(struct kprobe_insn_cache *c)
+{
+        return PAGE_SIZE/(c->insn_size * sizeof(kprobe_opcode_t));
+}
+
 enum kprobe_slot_state {
         SLOT_CLEAN = 0,
         SLOT_DIRTY = 1,
         SLOT_USED = 2,
 };
 
-static DEFINE_MUTEX(kprobe_insn_mutex); /* Protects kprobe_insn_pages */
-static LIST_HEAD(kprobe_insn_pages);
-static int kprobe_garbage_slots;
-static int collect_garbage_slots(void);
+static DEFINE_MUTEX(kprobe_insn_mutex); /* Protects kprobe_insn_slots */
+static struct kprobe_insn_cache kprobe_insn_slots = {
+        .pages = LIST_HEAD_INIT(kprobe_insn_slots.pages),
+        .insn_size = MAX_INSN_SIZE,
+        .nr_garbage = 0,
+};
+static int __kprobes collect_garbage_slots(struct kprobe_insn_cache *c);
 
 /**
  * __get_insn_slot() - Find a slot on an executable page for an instruction.
  * We allocate an executable page if there's no room on existing ones.
  */
-static kprobe_opcode_t __kprobes *__get_insn_slot(void)
+static kprobe_opcode_t __kprobes *__get_insn_slot(struct kprobe_insn_cache *c)
 {
         struct kprobe_insn_page *kip;
 
  retry:
-        list_for_each_entry(kip, &kprobe_insn_pages, list) {
-                if (kip->nused < INSNS_PER_PAGE) {
+        list_for_each_entry(kip, &c->pages, list) {
+                if (kip->nused < slots_per_page(c)) {
                         int i;
-                        for (i = 0; i < INSNS_PER_PAGE; i++) {
+                        for (i = 0; i < slots_per_page(c); i++) {
                                 if (kip->slot_used[i] == SLOT_CLEAN) {
                                         kip->slot_used[i] = SLOT_USED;
                                         kip->nused++;
-                                        return kip->insns + (i * MAX_INSN_SIZE);
+                                        return kip->insns + (i * c->insn_size);
                                 }
                         }
-                        /* Surprise!  No unused slots.  Fix kip->nused. */
-                        kip->nused = INSNS_PER_PAGE;
+                        /* kip->nused is broken. Fix it. */
+                        kip->nused = slots_per_page(c);
+                        WARN_ON(1);
                 }
         }
 
         /* If there are any garbage slots, collect it and try again. */
-        if (kprobe_garbage_slots && collect_garbage_slots() == 0) {
+        if (c->nr_garbage && collect_garbage_slots(c) == 0)
                 goto retry;
-        }
-        /* All out of space.  Need to allocate a new page. Use slot 0. */
-        kip = kmalloc(sizeof(struct kprobe_insn_page), GFP_KERNEL);
+
+        /* All out of space.  Need to allocate a new page. */
+        kip = kmalloc(KPROBE_INSN_PAGE_SIZE(slots_per_page(c)), GFP_KERNEL);
         if (!kip)
                 return NULL;
 
@@ -170,20 +189,23 @@ static kprobe_opcode_t __kprobes *__get_insn_slot(void)
                 return NULL;
         }
         INIT_LIST_HEAD(&kip->list);
-        list_add(&kip->list, &kprobe_insn_pages);
-        memset(kip->slot_used, SLOT_CLEAN, INSNS_PER_PAGE);
+        memset(kip->slot_used, SLOT_CLEAN, slots_per_page(c));
         kip->slot_used[0] = SLOT_USED;
         kip->nused = 1;
         kip->ngarbage = 0;
+        list_add(&kip->list, &c->pages);
         return kip->insns;
 }
 
+
 kprobe_opcode_t __kprobes *get_insn_slot(void)
 {
-        kprobe_opcode_t *ret;
+        kprobe_opcode_t *ret = NULL;
+
         mutex_lock(&kprobe_insn_mutex);
-        ret = __get_insn_slot();
+        ret = __get_insn_slot(&kprobe_insn_slots);
         mutex_unlock(&kprobe_insn_mutex);
+
         return ret;
 }
 
@@ -199,7 +221,7 @@ static int __kprobes collect_one_slot(struct kprobe_insn_page *kip, int idx)
                  * so as not to have to set it up again the
                  * next time somebody inserts a probe.
                  */
-                if (!list_is_singular(&kprobe_insn_pages)) {
+                if (!list_is_singular(&kip->list)) {
                         list_del(&kip->list);
                         module_free(NULL, kip->insns);
                         kfree(kip);
@@ -209,51 +231,85 @@ static int __kprobes collect_one_slot(struct kprobe_insn_page *kip, int idx)
         return 0;
 }
 
-static int __kprobes collect_garbage_slots(void)
+static int __kprobes collect_garbage_slots(struct kprobe_insn_cache *c)
 {
         struct kprobe_insn_page *kip, *next;
 
         /* Ensure no-one is interrupted on the garbages */
         synchronize_sched();
 
-        list_for_each_entry_safe(kip, next, &kprobe_insn_pages, list) {
+        list_for_each_entry_safe(kip, next, &c->pages, list) {
                 int i;
                 if (kip->ngarbage == 0)
                         continue;
                 kip->ngarbage = 0;      /* we will collect all garbages */
-                for (i = 0; i < INSNS_PER_PAGE; i++) {
+                for (i = 0; i < slots_per_page(c); i++) {
                         if (kip->slot_used[i] == SLOT_DIRTY &&
                             collect_one_slot(kip, i))
                                 break;
                 }
         }
-        kprobe_garbage_slots = 0;
+        c->nr_garbage = 0;
         return 0;
 }
 
-void __kprobes free_insn_slot(kprobe_opcode_t * slot, int dirty)
+static void __kprobes __free_insn_slot(struct kprobe_insn_cache *c,
+                                       kprobe_opcode_t *slot, int dirty)
 {
         struct kprobe_insn_page *kip;
 
-        mutex_lock(&kprobe_insn_mutex);
-        list_for_each_entry(kip, &kprobe_insn_pages, list) {
-                if (kip->insns <= slot &&
-                    slot < kip->insns + (INSNS_PER_PAGE * MAX_INSN_SIZE)) {
-                        int i = (slot - kip->insns) / MAX_INSN_SIZE;
+        list_for_each_entry(kip, &c->pages, list) {
+                long idx = ((long)slot - (long)kip->insns) /
+                                (c->insn_size * sizeof(kprobe_opcode_t));
+                if (idx >= 0 && idx < slots_per_page(c)) {
+                        WARN_ON(kip->slot_used[idx] != SLOT_USED);
                         if (dirty) {
-                                kip->slot_used[i] = SLOT_DIRTY;
+                                kip->slot_used[idx] = SLOT_DIRTY;
                                 kip->ngarbage++;
+                                if (++c->nr_garbage > slots_per_page(c))
+                                        collect_garbage_slots(c);
                         } else
-                                collect_one_slot(kip, i);
-                        break;
+                                collect_one_slot(kip, idx);
+                        return;
                 }
         }
+        /* Could not free this slot. */
+        WARN_ON(1);
+}
 
-        if (dirty && ++kprobe_garbage_slots > INSNS_PER_PAGE)
-                collect_garbage_slots();
-
+void __kprobes free_insn_slot(kprobe_opcode_t * slot, int dirty)
+{
+        mutex_lock(&kprobe_insn_mutex);
+        __free_insn_slot(&kprobe_insn_slots, slot, dirty);
         mutex_unlock(&kprobe_insn_mutex);
 }
+#ifdef CONFIG_OPTPROBES
+/* For optimized_kprobe buffer */
+static DEFINE_MUTEX(kprobe_optinsn_mutex); /* Protects kprobe_optinsn_slots */
+static struct kprobe_insn_cache kprobe_optinsn_slots = {
+        .pages = LIST_HEAD_INIT(kprobe_optinsn_slots.pages),
+        /* .insn_size is initialized later */
+        .nr_garbage = 0,
+};
+/* Get a slot for optimized_kprobe buffer */
+kprobe_opcode_t __kprobes *get_optinsn_slot(void)
+{
+        kprobe_opcode_t *ret = NULL;
+
+        mutex_lock(&kprobe_optinsn_mutex);
+        ret = __get_insn_slot(&kprobe_optinsn_slots);
+        mutex_unlock(&kprobe_optinsn_mutex);
+
+        return ret;
+}
+
+void __kprobes free_optinsn_slot(kprobe_opcode_t * slot, int dirty)
+{
+        mutex_lock(&kprobe_optinsn_mutex);
+        __free_insn_slot(&kprobe_optinsn_slots, slot, dirty);
+        mutex_unlock(&kprobe_optinsn_mutex);
+}
+#endif
 #endif
 
 /* We have preemption disabled.. so it is safe to use __ versions */
@@ -284,23 +340,401 @@ struct kprobe __kprobes *get_kprobe(void *addr)
                 if (p->addr == addr)
                         return p;
         }
+
+        return NULL;
+}
+
+static int __kprobes aggr_pre_handler(struct kprobe *p, struct pt_regs *regs);
+
+/* Return true if the kprobe is an aggregator */
+static inline int kprobe_aggrprobe(struct kprobe *p)
+{
+        return p->pre_handler == aggr_pre_handler;
+}
+
+/*
+ * Keep all fields in the kprobe consistent
+ */
+static inline void copy_kprobe(struct kprobe *old_p, struct kprobe *p)
+{
+        memcpy(&p->opcode, &old_p->opcode, sizeof(kprobe_opcode_t));
+        memcpy(&p->ainsn, &old_p->ainsn, sizeof(struct arch_specific_insn));
+}
+
+#ifdef CONFIG_OPTPROBES
+/* NOTE: change this value only with kprobe_mutex held */
+static bool kprobes_allow_optimization;
+
+/*
+ * Call all pre_handler on the list, but ignores its return value.
+ * This must be called from arch-dep optimized caller.
+ */
+void __kprobes opt_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 && likely(!kprobe_disabled(kp))) {
+                        set_kprobe_instance(kp);
+                        kp->pre_handler(kp, regs);
+                }
+                reset_kprobe_instance();
+        }
+}
+
+/* Return true(!0) if the kprobe is ready for optimization. */
+static inline int kprobe_optready(struct kprobe *p)
+{
+        struct optimized_kprobe *op;
+
+        if (kprobe_aggrprobe(p)) {
+                op = container_of(p, struct optimized_kprobe, kp);
+                return arch_prepared_optinsn(&op->optinsn);
+        }
+
+        return 0;
+}
+
+/*
+ * Return an optimized kprobe whose optimizing code replaces
+ * instructions including addr (exclude breakpoint).
+ */
+struct kprobe *__kprobes get_optimized_kprobe(unsigned long addr)
+{
+        int i;
+        struct kprobe *p = NULL;
+        struct optimized_kprobe *op;
+
+        /* Don't check i == 0, since that is a breakpoint case. */
+        for (i = 1; !p && i < MAX_OPTIMIZED_LENGTH; i++)
+                p = get_kprobe((void *)(addr - i));
+
+        if (p && kprobe_optready(p)) {
+                op = container_of(p, struct optimized_kprobe, kp);
+                if (arch_within_optimized_kprobe(op, addr))
+                        return p;
+        }
+
         return NULL;
 }
 
+/* Optimization staging list, protected by kprobe_mutex */
+static LIST_HEAD(optimizing_list);
+
+static void kprobe_optimizer(struct work_struct *work);
+static DECLARE_DELAYED_WORK(optimizing_work, kprobe_optimizer);
+#define OPTIMIZE_DELAY 5
+
+/* Kprobe jump optimizer */
+static __kprobes void kprobe_optimizer(struct work_struct *work)
+{
+        struct optimized_kprobe *op, *tmp;
+
+        /* Lock modules while optimizing kprobes */
+        mutex_lock(&module_mutex);
+        mutex_lock(&kprobe_mutex);
+        if (kprobes_all_disarmed || !kprobes_allow_optimization)
+                goto end;
+
+        /*
+         * Wait for quiesence period to ensure all running interrupts
+         * are done. Because optprobe may modify multiple instructions
+         * there is a chance that Nth instruction is interrupted. In that
+         * case, running interrupt can return to 2nd-Nth byte of jump
+         * instruction. This wait is for avoiding it.
+         */
+        synchronize_sched();
+
+        /*
+         * The optimization/unoptimization refers online_cpus via
+         * stop_machine() and cpu-hotplug modifies online_cpus.
+         * And same time, text_mutex will be held in cpu-hotplug and here.
+         * This combination can cause a deadlock (cpu-hotplug try to lock
+         * text_mutex but stop_machine can not be done because online_cpus
+         * has been changed)
+         * To avoid this deadlock, we need to call get_online_cpus()
+         * for preventing cpu-hotplug outside of text_mutex locking.
+         */
+        get_online_cpus();
+        mutex_lock(&text_mutex);
+        list_for_each_entry_safe(op, tmp, &optimizing_list, list) {
+                WARN_ON(kprobe_disabled(&op->kp));
+                if (arch_optimize_kprobe(op) < 0)
+                        op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED;
+                list_del_init(&op->list);
+        }
+        mutex_unlock(&text_mutex);
+        put_online_cpus();
+end:
+        mutex_unlock(&kprobe_mutex);
+        mutex_unlock(&module_mutex);
+}
+
+/* Optimize kprobe if p is ready to be optimized */
+static __kprobes void optimize_kprobe(struct kprobe *p)
+{
+        struct optimized_kprobe *op;
+
+        /* Check if the kprobe is disabled or not ready for optimization. */
+        if (!kprobe_optready(p) || !kprobes_allow_optimization ||
+            (kprobe_disabled(p) || kprobes_all_disarmed))
+                return;
+
+        /* Both of break_handler and post_handler are not supported. */
+        if (p->break_handler || p->post_handler)
+                return;
+
+        op = container_of(p, struct optimized_kprobe, kp);
+
+        /* Check there is no other kprobes at the optimized instructions */
+        if (arch_check_optimized_kprobe(op) < 0)
+                return;
+
+        /* Check if it is already optimized. */
+        if (op->kp.flags & KPROBE_FLAG_OPTIMIZED)
+                return;
+
+        op->kp.flags |= KPROBE_FLAG_OPTIMIZED;
+        list_add(&op->list, &optimizing_list);
+        if (!delayed_work_pending(&optimizing_work))
+                schedule_delayed_work(&optimizing_work, OPTIMIZE_DELAY);
+}
+
+/* Unoptimize a kprobe if p is optimized */
+static __kprobes void unoptimize_kprobe(struct kprobe *p)
+{
+        struct optimized_kprobe *op;
+
+        if ((p->flags & KPROBE_FLAG_OPTIMIZED) && kprobe_aggrprobe(p)) {
+                op = container_of(p, struct optimized_kprobe, kp);
+                if (!list_empty(&op->list))
+                        /* Dequeue from the optimization queue */
+                        list_del_init(&op->list);
+                else
+                        /* Replace jump with break */
+                        arch_unoptimize_kprobe(op);
+                op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED;
+        }
+}
+
+/* Remove optimized instructions */
+static void __kprobes kill_optimized_kprobe(struct kprobe *p)
+{
+        struct optimized_kprobe *op;
+
+        op = container_of(p, struct optimized_kprobe, kp);
+        if (!list_empty(&op->list)) {
+                /* Dequeue from the optimization queue */
+                list_del_init(&op->list);
+                op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED;
+        }
+        /* Don't unoptimize, because the target code will be freed. */
+        arch_remove_optimized_kprobe(op);
+}
+
+/* Try to prepare optimized instructions */
+static __kprobes void prepare_optimized_kprobe(struct kprobe *p)
+{
+        struct optimized_kprobe *op;
+
+        op = container_of(p, struct optimized_kprobe, kp);
+        arch_prepare_optimized_kprobe(op);
+}
+
+/* Free optimized instructions and optimized_kprobe */
+static __kprobes void free_aggr_kprobe(struct kprobe *p)
+{
+        struct optimized_kprobe *op;
+
+        op = container_of(p, struct optimized_kprobe, kp);
+        arch_remove_optimized_kprobe(op);
+        kfree(op);
+}
+
+/* Allocate new optimized_kprobe and try to prepare optimized instructions */
+static __kprobes struct kprobe *alloc_aggr_kprobe(struct kprobe *p)
+{
+        struct optimized_kprobe *op;
+
+        op = kzalloc(sizeof(struct optimized_kprobe), GFP_KERNEL);
+        if (!op)
+                return NULL;
+
+        INIT_LIST_HEAD(&op->list);
+        op->kp.addr = p->addr;
+        arch_prepare_optimized_kprobe(op);
+
+        return &op->kp;
+}
+
+static void __kprobes init_aggr_kprobe(struct kprobe *ap, struct kprobe *p);
+
+/*
+ * Prepare an optimized_kprobe and optimize it
+ * NOTE: p must be a normal registered kprobe
+ */
+static __kprobes void try_to_optimize_kprobe(struct kprobe *p)
+{
+        struct kprobe *ap;
+        struct optimized_kprobe *op;
+
+        ap = alloc_aggr_kprobe(p);
+        if (!ap)
+                return;
+
+        op = container_of(ap, struct optimized_kprobe, kp);
+        if (!arch_prepared_optinsn(&op->optinsn)) {
+                /* If failed to setup optimizing, fallback to kprobe */
+                free_aggr_kprobe(ap);
+                return;
+        }
+
+        init_aggr_kprobe(ap, p);
+        optimize_kprobe(ap);
+}
+
+#ifdef CONFIG_SYSCTL
+static void __kprobes optimize_all_kprobes(void)
+{
+        struct hlist_head *head;
+        struct hlist_node *node;
+        struct kprobe *p;
+        unsigned int i;
+
+        /* If optimization is already allowed, just return */
+        if (kprobes_allow_optimization)
+                return;
+
+        kprobes_allow_optimization = true;
+        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_disabled(p))
+                                optimize_kprobe(p);
+        }
+        mutex_unlock(&text_mutex);
+        printk(KERN_INFO "Kprobes globally optimized\n");
+}
+
+static void __kprobes unoptimize_all_kprobes(void)
+{
+        struct hlist_head *head;
+        struct hlist_node *node;
+        struct kprobe *p;
+        unsigned int i;
+
+        /* If optimization is already prohibited, just return */
+        if (!kprobes_allow_optimization)
+                return;
+
+        kprobes_allow_optimization = false;
+        printk(KERN_INFO "Kprobes globally unoptimized\n");
+        get_online_cpus();      /* For avoiding text_mutex deadlock */
+        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_disabled(p))
+                                unoptimize_kprobe(p);
+                }
+        }
+
+        mutex_unlock(&text_mutex);
+        put_online_cpus();
+        /* Allow all currently running kprobes to complete */
+        synchronize_sched();
+}
+
+int sysctl_kprobes_optimization;
+int proc_kprobes_optimization_handler(struct ctl_table *table, int write,
+                                      void __user *buffer, size_t *length,
+                                      loff_t *ppos)
+{
+        int ret;
+
+        mutex_lock(&kprobe_mutex);
+        sysctl_kprobes_optimization = kprobes_allow_optimization ? 1 : 0;
+        ret = proc_dointvec_minmax(table, write, buffer, length, ppos);
+
+        if (sysctl_kprobes_optimization)
+                optimize_all_kprobes();
+        else
+                unoptimize_all_kprobes();
+        mutex_unlock(&kprobe_mutex);
+
+        return ret;
+}
+#endif /* CONFIG_SYSCTL */
+
+static void __kprobes __arm_kprobe(struct kprobe *p)
+{
+        struct kprobe *old_p;
+
+        /* Check collision with other optimized kprobes */
+        old_p = get_optimized_kprobe((unsigned long)p->addr);
+        if (unlikely(old_p))
+                unoptimize_kprobe(old_p); /* Fallback to unoptimized kprobe */
+
+        arch_arm_kprobe(p);
+        optimize_kprobe(p);     /* Try to optimize (add kprobe to a list) */
+}
+
+static void __kprobes __disarm_kprobe(struct kprobe *p)
+{
+        struct kprobe *old_p;
+
+        unoptimize_kprobe(p);   /* Try to unoptimize */
+        arch_disarm_kprobe(p);
+
+        /* If another kprobe was blocked, optimize it. */
+        old_p = get_optimized_kprobe((unsigned long)p->addr);
+        if (unlikely(old_p))
+                optimize_kprobe(old_p);
+}
+
+#else /* !CONFIG_OPTPROBES */
+
+#define optimize_kprobe(p)                      do {} while (0)
+#define unoptimize_kprobe(p)                    do {} while (0)
+#define kill_optimized_kprobe(p)                do {} while (0)
+#define prepare_optimized_kprobe(p)             do {} while (0)
+#define try_to_optimize_kprobe(p)               do {} while (0)
+#define __arm_kprobe(p)                         arch_arm_kprobe(p)
+#define __disarm_kprobe(p)                      arch_disarm_kprobe(p)
+
+static __kprobes void free_aggr_kprobe(struct kprobe *p)
+{
+        kfree(p);
+}
+
+static __kprobes struct kprobe *alloc_aggr_kprobe(struct kprobe *p)
+{
+        return kzalloc(sizeof(struct kprobe), GFP_KERNEL);
+}
+#endif /* CONFIG_OPTPROBES */
+
 /* Arm a kprobe with text_mutex */
 static void __kprobes arm_kprobe(struct kprobe *kp)
 {
+        /*
+         * Here, since __arm_kprobe() doesn't use stop_machine(),
+         * this doesn't cause deadlock on text_mutex. So, we don't
+         * need get_online_cpus().
+         */
         mutex_lock(&text_mutex);
-        arch_arm_kprobe(kp);
+        __arm_kprobe(kp);
         mutex_unlock(&text_mutex);
 }
 
 /* Disarm a kprobe with text_mutex */
 static void __kprobes disarm_kprobe(struct kprobe *kp)
 {
+        get_online_cpus();      /* For avoiding text_mutex deadlock */
         mutex_lock(&text_mutex);
-        arch_disarm_kprobe(kp);
+        __disarm_kprobe(kp);
         mutex_unlock(&text_mutex);
+        put_online_cpus();
 }
 
 /*
@@ -369,7 +803,7 @@ static int __kprobes aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
 void __kprobes kprobes_inc_nmissed_count(struct kprobe *p)
 {
         struct kprobe *kp;
-        if (p->pre_handler != aggr_pre_handler) {
+        if (!kprobe_aggrprobe(p)) {
                 p->nmissed++;
         } else {
                 list_for_each_entry_rcu(kp, &p->list, list)
@@ -493,21 +927,16 @@ static void __kprobes cleanup_rp_inst(struct kretprobe *rp)
 }
 
 /*
- * Keep all fields in the kprobe consistent
- */
-static inline void copy_kprobe(struct kprobe *old_p, struct kprobe *p)
-{
-        memcpy(&p->opcode, &old_p->opcode, sizeof(kprobe_opcode_t));
-        memcpy(&p->ainsn, &old_p->ainsn, sizeof(struct arch_specific_insn));
-}
-
-/*
 * 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 *ap, struct kprobe *p)
 {
         BUG_ON(kprobe_gone(ap) || kprobe_gone(p));
+
+        if (p->break_handler || p->post_handler)
+                unoptimize_kprobe(ap);  /* Fall back to normal kprobe */
+
         if (p->break_handler) {
                 if (ap->break_handler)
                         return -EEXIST;
@@ -522,7 +951,7 @@ static int __kprobes add_new_kprobe(struct kprobe *ap, struct kprobe *p)
                 ap->flags &= ~KPROBE_FLAG_DISABLED;
                 if (!kprobes_all_disarmed)
                         /* Arm the breakpoint again. */
-                        arm_kprobe(ap);
+                        __arm_kprobe(ap);
         }
         return 0;
 }
@@ -531,12 +960,13 @@ static int __kprobes add_new_kprobe(struct kprobe *ap, struct kprobe *p)
  * Fill in the required fields of the "manager kprobe". Replace the
  * earlier kprobe in the hlist with the manager kprobe
  */
-static inline void add_aggr_kprobe(struct kprobe *ap, struct kprobe *p)
+static void __kprobes init_aggr_kprobe(struct kprobe *ap, struct kprobe *p)
 {
+        /* Copy p's insn slot to ap */
         copy_kprobe(p, ap);
         flush_insn_slot(ap);
         ap->addr = p->addr;
-        ap->flags = p->flags;
+        ap->flags = p->flags & ~KPROBE_FLAG_OPTIMIZED;
         ap->pre_handler = aggr_pre_handler;
         ap->fault_handler = aggr_fault_handler;
         /* We don't care the kprobe which has gone. */
@@ -546,8 +976,9 @@ static inline void add_aggr_kprobe(struct kprobe *ap, struct kprobe *p)
                 ap->break_handler = aggr_break_handler;
 
         INIT_LIST_HEAD(&ap->list);
-        list_add_rcu(&p->list, &ap->list);
+        INIT_HLIST_NODE(&ap->hlist);
 
+        list_add_rcu(&p->list, &ap->list);
         hlist_replace_rcu(&p->hlist, &ap->hlist);
 }
 
@@ -561,12 +992,12 @@ static int __kprobes register_aggr_kprobe(struct kprobe *old_p,
         int ret = 0;
         struct kprobe *ap = 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 (!kprobe_aggrprobe(old_p)) {
+                /* If old_p is not an aggr_kprobe, create new aggr_kprobe. */
+                ap = alloc_aggr_kprobe(old_p);
                 if (!ap)
                         return -ENOMEM;
-                add_aggr_kprobe(ap, old_p);
+                init_aggr_kprobe(ap, old_p);
         }
 
         if (kprobe_gone(ap)) {
@@ -585,6 +1016,9 @@ static int __kprobes register_aggr_kprobe(struct kprobe *old_p,
                          */
                         return ret;
 
+                /* Prepare optimized instructions if possible. */
+                prepare_optimized_kprobe(ap);
+
                 /*
                  * Clear gone flag to prevent allocating new slot again, and
                  * set disabled flag because it is not armed yet.
@@ -593,6 +1027,7 @@ static int __kprobes register_aggr_kprobe(struct kprobe *old_p,
                             | KPROBE_FLAG_DISABLED;
         }
 
+        /* Copy ap's insn slot to p */
         copy_kprobe(ap, p);
         return add_new_kprobe(ap, p);
 }
@@ -743,27 +1178,34 @@ int __kprobes register_kprobe(struct kprobe *p)
         p->nmissed = 0;
         INIT_LIST_HEAD(&p->list);
         mutex_lock(&kprobe_mutex);
+
+        get_online_cpus();      /* For avoiding text_mutex deadlock. */
+        mutex_lock(&text_mutex);
+
         old_p = get_kprobe(p->addr);
         if (old_p) {
+                /* Since this may unoptimize old_p, locking text_mutex. */
                 ret = register_aggr_kprobe(old_p, p);
                 goto out;
         }
 
-        mutex_lock(&text_mutex);
         ret = arch_prepare_kprobe(p);
         if (ret)
-                goto out_unlock_text;
+                goto out;
 
         INIT_HLIST_NODE(&p->hlist);
         hlist_add_head_rcu(&p->hlist,
                        &kprobe_table[hash_ptr(p->addr, KPROBE_HASH_BITS)]);
 
         if (!kprobes_all_disarmed && !kprobe_disabled(p))
-                arch_arm_kprobe(p);
+                __arm_kprobe(p);
+
+        /* Try to optimize kprobe */
+        try_to_optimize_kprobe(p);
 
-out_unlock_text:
-        mutex_unlock(&text_mutex);
 out:
+        mutex_unlock(&text_mutex);
+        put_online_cpus();
         mutex_unlock(&kprobe_mutex);
 
         if (probed_mod)
@@ -785,7 +1227,7 @@ static int __kprobes __unregister_kprobe_top(struct kprobe *p)
                 return -EINVAL;
 
         if (old_p == p ||
-            (old_p->pre_handler == aggr_pre_handler &&
+            (kprobe_aggrprobe(old_p) &&
              list_is_singular(&old_p->list))) {
                 /*
                  * Only probe on the hash list. Disarm only if kprobes are
@@ -793,7 +1235,7 @@ static int __kprobes __unregister_kprobe_top(struct kprobe *p)
                  * already have been removed. We save on flushing icache.
                  */
                 if (!kprobes_all_disarmed && !kprobe_disabled(old_p))
-                        disarm_kprobe(p);
+                        disarm_kprobe(old_p);
                 hlist_del_rcu(&old_p->hlist);
         } else {
                 if (p->break_handler && !kprobe_gone(p))
@@ -809,8 +1251,13 @@ 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))
-                                disarm_kprobe(old_p);
+                        if (!kprobes_all_disarmed) {
+                                if (kprobe_disabled(old_p))
+                                        disarm_kprobe(old_p);
+                                else
+                                        /* Try to optimize this probe again */
+                                        optimize_kprobe(old_p);
+                        }
                 }
         }
         return 0;
@@ -827,7 +1274,7 @@ static void __kprobes __unregister_kprobe_bottom(struct kprobe *p)
                 old_p = list_entry(p->list.next, struct kprobe, list);
                 list_del(&p->list);
                 arch_remove_kprobe(old_p);
-                kfree(old_p);
+                free_aggr_kprobe(old_p);
         }
 }
 
@@ -1123,7 +1570,7 @@ static void __kprobes kill_kprobe(struct kprobe *p)
         struct kprobe *kp;
 
         p->flags |= KPROBE_FLAG_GONE;
-        if (p->pre_handler == aggr_pre_handler) {
+        if (kprobe_aggrprobe(p)) {
                 /*
                  * If this is an aggr_kprobe, we have to list all the
                  * chained probes and mark them GONE.
@@ -1132,6 +1579,7 @@ static void __kprobes kill_kprobe(struct kprobe *p)
                         kp->flags |= KPROBE_FLAG_GONE;
                 p->post_handler = NULL;
                 p->break_handler = NULL;
+                kill_optimized_kprobe(p);
         }
         /*
          * Here, we can remove insn_slot safely, because no thread calls
@@ -1241,6 +1689,15 @@ static int __init init_kprobes(void)
                 }
         }
 
+#if defined(CONFIG_OPTPROBES)
+#if defined(__ARCH_WANT_KPROBES_INSN_SLOT)
+        /* Init kprobe_optinsn_slots */
+        kprobe_optinsn_slots.insn_size = MAX_OPTINSN_SIZE;
+#endif
+        /* By default, kprobes can be optimized */
+        kprobes_allow_optimization = true;
+#endif
+
         /* By default, kprobes are armed */
         kprobes_all_disarmed = false;
 
@@ -1259,7 +1716,7 @@ static int __init init_kprobes(void)
 
 #ifdef CONFIG_DEBUG_FS
 static void __kprobes report_probe(struct seq_file *pi, struct kprobe *p,
-                const char *sym, int offset,char *modname)
+                const char *sym, int offset, char *modname, struct kprobe *pp)
 {
         char *kprobe_type;
 
@@ -1269,19 +1726,21 @@ static void __kprobes report_probe(struct seq_file *pi, struct kprobe *p,
                 kprobe_type = "j";
         else
                 kprobe_type = "k";
+
         if (sym)
-                seq_printf(pi, "%p  %s  %s+0x%x  %s %s%s\n",
+                seq_printf(pi, "%p  %s  %s+0x%x  %s ",
                         p->addr, kprobe_type, sym, offset,
-                        (modname ? modname : " "),
-                        (kprobe_gone(p) ? "[GONE]" : ""),
-                        ((kprobe_disabled(p) && !kprobe_gone(p)) ?
-                         "[DISABLED]" : ""));
+                        (modname ? modname : " "));
         else
-                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]" : ""));
+                seq_printf(pi, "%p  %s  %p ",
+                        p->addr, kprobe_type, p->addr);
+
+        if (!pp)
+                pp = p;
+        seq_printf(pi, "%s%s%s\n",
+                (kprobe_gone(p) ? "[GONE]" : ""),
+                ((kprobe_disabled(p) && !kprobe_gone(p)) ?  "[DISABLED]" : ""),
+                (kprobe_optimized(pp) ? "[OPTIMIZED]" : ""));
 }
 
 static void __kprobes *kprobe_seq_start(struct seq_file *f, loff_t *pos)
@@ -1317,11 +1776,11 @@ static int __kprobes show_kprobe_addr(struct seq_file *pi, void *v)
         hlist_for_each_entry_rcu(p, node, head, hlist) {
                 sym = kallsyms_lookup((unsigned long)p->addr, NULL,
                                         &offset, &modname, namebuf);
-                if (p->pre_handler == aggr_pre_handler) {
+                if (kprobe_aggrprobe(p)) {
                         list_for_each_entry_rcu(kp, &p->list, list)
-                                report_probe(pi, kp, sym, offset, modname);
+                                report_probe(pi, kp, sym, offset, modname, p);
                 } else
-                        report_probe(pi, p, sym, offset, modname);
+                        report_probe(pi, p, sym, offset, modname, NULL);
         }
         preempt_enable();
         return 0;
@@ -1399,12 +1858,13 @@ int __kprobes enable_kprobe(struct kprobe *kp)
                 goto out;
         }
 
-        if (!kprobes_all_disarmed && kprobe_disabled(p))
-                arm_kprobe(p);
-
-        p->flags &= ~KPROBE_FLAG_DISABLED;
         if (p != kp)
                 kp->flags &= ~KPROBE_FLAG_DISABLED;
+
+        if (!kprobes_all_disarmed && kprobe_disabled(p)) {
+                p->flags &= ~KPROBE_FLAG_DISABLED;
+                arm_kprobe(p);
+        }
 out:
         mutex_unlock(&kprobe_mutex);
         return ret;
@@ -1424,12 +1884,13 @@ static void __kprobes arm_all_kprobes(void)
         if (!kprobes_all_disarmed)
                 goto already_enabled;
 
+        /* Arming kprobes doesn't optimize kprobe itself */
         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_disabled(p))
-                                arch_arm_kprobe(p);
+                                __arm_kprobe(p);
         }
         mutex_unlock(&text_mutex);
 
@@ -1456,16 +1917,23 @@ static void __kprobes disarm_all_kprobes(void)
 
         kprobes_all_disarmed = true;
         printk(KERN_INFO "Kprobes globally disabled\n");
+
+        /*
+         * Here we call get_online_cpus() for avoiding text_mutex deadlock,
+         * because disarming may also unoptimize kprobes.
+         */
+        get_online_cpus();
         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_disabled(p))
-                                arch_disarm_kprobe(p);
+                                __disarm_kprobe(p);
                 }
         }
 
         mutex_unlock(&text_mutex);
+        put_online_cpus();
         mutex_unlock(&kprobe_mutex);
         /* Allow all currently running kprobes to complete */
         synchronize_sched();
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 6b1ccc3f0205..21fe3c426948 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -33,7 +33,7 @@ static ssize_t uevent_seqnum_show(struct kobject *kobj,
 }
 KERNEL_ATTR_RO(uevent_seqnum);
 
-/* uevent helper program, used during early boo */
+/* uevent helper program, used during early boot */
 static ssize_t uevent_helper_show(struct kobject *kobj,
                                   struct kobj_attribute *attr, char *buf)
 {
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 82ed0ea15194..83911c780175 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -219,7 +219,7 @@ int kthreadd(void *unused)
         set_task_comm(tsk, "kthreadd");
         ignore_signals(tsk);
         set_cpus_allowed_ptr(tsk, cpu_all_mask);
-        set_mems_allowed(node_possible_map);
+        set_mems_allowed(node_states[N_HIGH_MEMORY]);
 
         current->flags |= PF_NOFREEZE | PF_FREEZER_NOSIG;
 
diff --git a/kernel/latencytop.c b/kernel/latencytop.c
index ca07c5c0c914..877fb306d415 100644
--- a/kernel/latencytop.c
+++ b/kernel/latencytop.c
@@ -56,7 +56,6 @@
 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/list.h>
-#include <linux/slab.h>
 #include <linux/stacktrace.h>
 
 static DEFINE_SPINLOCK(latency_lock);
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 0c30d0455de1..2594e1ce41cb 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -43,6 +43,7 @@
 #include <linux/ftrace.h>
 #include <linux/stringify.h>
 #include <linux/bitops.h>
+#include <linux/gfp.h>
 
 #include <asm/sections.h>
 
@@ -582,9 +583,6 @@ static int static_obj(void *obj)
         unsigned long start = (unsigned long) &_stext,
                       end   = (unsigned long) &_end,
                       addr  = (unsigned long) obj;
-#ifdef CONFIG_SMP
-        int i;
-#endif
 
         /*
          * static variable?
@@ -595,24 +593,16 @@ static int static_obj(void *obj)
         if (arch_is_kernel_data(addr))
                 return 1;
 
-#ifdef CONFIG_SMP
         /*
-         * percpu var?
+         * in-kernel percpu var?
          */
-        for_each_possible_cpu(i) {
-                start = (unsigned long) &__per_cpu_start + per_cpu_offset(i);
-                end   = (unsigned long) &__per_cpu_start + PERCPU_ENOUGH_ROOM
-                                        + per_cpu_offset(i);
-
-                if ((addr >= start) && (addr < end))
-                        return 1;
-        }
-#endif
+        if (is_kernel_percpu_address(addr))
+                return 1;
 
         /*
-         * module var?
+         * module static or percpu var?
          */
-        return is_module_address(addr);
+        return is_module_address(addr) || is_module_percpu_address(addr);
 }
 
 /*
@@ -3211,8 +3201,6 @@ 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;
 
@@ -3220,6 +3208,7 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
         check_flags(flags);
 
         current->lockdep_recursion = 1;
+        trace_lock_acquire(lock, subclass, trylock, read, check, nest_lock, ip);
         __lock_acquire(lock, subclass, trylock, read, check,
                        irqs_disabled_flags(flags), nest_lock, ip, 0);
         current->lockdep_recursion = 0;
@@ -3232,14 +3221,13 @@ void lock_release(struct lockdep_map *lock, int nested,
 {
         unsigned long flags;
 
-        trace_lock_release(lock, nested, ip);
-
         if (unlikely(current->lockdep_recursion))
                 return;
 
         raw_local_irq_save(flags);
         check_flags(flags);
         current->lockdep_recursion = 1;
+        trace_lock_release(lock, nested, ip);
         __lock_release(lock, nested, ip);
         current->lockdep_recursion = 0;
         raw_local_irq_restore(flags);
@@ -3413,8 +3401,6 @@ void lock_contended(struct lockdep_map *lock, unsigned long ip)
 {
         unsigned long flags;
 
-        trace_lock_contended(lock, ip);
-
         if (unlikely(!lock_stat))
                 return;
 
@@ -3424,6 +3410,7 @@ void lock_contended(struct lockdep_map *lock, unsigned long ip)
         raw_local_irq_save(flags);
         check_flags(flags);
         current->lockdep_recursion = 1;
+        trace_lock_contended(lock, ip);
         __lock_contended(lock, ip);
         current->lockdep_recursion = 0;
         raw_local_irq_restore(flags);
@@ -3822,6 +3809,7 @@ void lockdep_rcu_dereference(const char *file, const int line)
         printk("%s:%d invoked rcu_dereference_check() without protection!\n",
                         file, line);
         printk("\nother info that might help us debug this:\n\n");
+        printk("\nrcu_scheduler_active = %d, debug_locks = %d\n", rcu_scheduler_active, debug_locks);
         lockdep_print_held_locks(curr);
         printk("\nstack backtrace:\n");
         dump_stack();
diff --git a/kernel/module.c b/kernel/module.c
index e5538d5f00ad..1016b75b026a 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -370,27 +370,33 @@ EXPORT_SYMBOL_GPL(find_module);
 
 #ifdef CONFIG_SMP
 
-static void *percpu_modalloc(unsigned long size, unsigned long align,
-                             const char *name)
+static inline void __percpu *mod_percpu(struct module *mod)
 {
-        void *ptr;
+        return mod->percpu;
+}
 
+static int percpu_modalloc(struct module *mod,
+                           unsigned long size, unsigned long align)
+{
         if (align > PAGE_SIZE) {
                 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
-                       name, align, PAGE_SIZE);
+                       mod->name, align, PAGE_SIZE);
                 align = PAGE_SIZE;
         }
 
-        ptr = __alloc_reserved_percpu(size, align);
-        if (!ptr)
+        mod->percpu = __alloc_reserved_percpu(size, align);
+        if (!mod->percpu) {
                 printk(KERN_WARNING
                        "Could not allocate %lu bytes percpu data\n", size);
-        return ptr;
+                return -ENOMEM;
+        }
+        mod->percpu_size = size;
+        return 0;
 }
 
-static void percpu_modfree(void *freeme)
+static void percpu_modfree(struct module *mod)
 {
-        free_percpu(freeme);
+        free_percpu(mod->percpu);
 }
 
 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
@@ -400,24 +406,62 @@ static unsigned int find_pcpusec(Elf_Ehdr *hdr,
         return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
 }
 
-static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
+static void percpu_modcopy(struct module *mod,
+                           const void *from, unsigned long size)
 {
         int cpu;
 
         for_each_possible_cpu(cpu)
-                memcpy(pcpudest + per_cpu_offset(cpu), from, size);
+                memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
+}
+
+/**
+ * is_module_percpu_address - test whether address is from module static percpu
+ * @addr: address to test
+ *
+ * Test whether @addr belongs to module static percpu area.
+ *
+ * RETURNS:
+ * %true if @addr is from module static percpu area
+ */
+bool is_module_percpu_address(unsigned long addr)
+{
+        struct module *mod;
+        unsigned int cpu;
+
+        preempt_disable();
+
+        list_for_each_entry_rcu(mod, &modules, list) {
+                if (!mod->percpu_size)
+                        continue;
+                for_each_possible_cpu(cpu) {
+                        void *start = per_cpu_ptr(mod->percpu, cpu);
+
+                        if ((void *)addr >= start &&
+                            (void *)addr < start + mod->percpu_size) {
+                                preempt_enable();
+                                return true;
+                        }
+                }
+        }
+
+        preempt_enable();
+        return false;
 }
 
 #else /* ... !CONFIG_SMP */
 
-static inline void *percpu_modalloc(unsigned long size, unsigned long align,
-                                    const char *name)
+static inline void __percpu *mod_percpu(struct module *mod)
 {
         return NULL;
 }
-static inline void percpu_modfree(void *pcpuptr)
+static inline int percpu_modalloc(struct module *mod,
+                                  unsigned long size, unsigned long align)
+{
+        return -ENOMEM;
+}
+static inline void percpu_modfree(struct module *mod)
 {
-        BUG();
 }
 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
                                         Elf_Shdr *sechdrs,
@@ -425,12 +469,16 @@ static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
 {
         return 0;
 }
-static inline void percpu_modcopy(void *pcpudst, const void *src,
-                                  unsigned long size)
+static inline void percpu_modcopy(struct module *mod,
+                                  const void *from, unsigned long size)
 {
         /* pcpusec should be 0, and size of that section should be 0. */
         BUG_ON(size != 0);
 }
+bool is_module_percpu_address(unsigned long addr)
+{
+        return false;
+}
 
 #endif /* CONFIG_SMP */
 
@@ -473,11 +521,13 @@ static void module_unload_init(struct module *mod)
         int cpu;
 
         INIT_LIST_HEAD(&mod->modules_which_use_me);
-        for_each_possible_cpu(cpu)
-                per_cpu_ptr(mod->refptr, cpu)->count = 0;
+        for_each_possible_cpu(cpu) {
+                per_cpu_ptr(mod->refptr, cpu)->incs = 0;
+                per_cpu_ptr(mod->refptr, cpu)->decs = 0;
+        }
 
         /* Hold reference count during initialization. */
-        __this_cpu_write(mod->refptr->count, 1);
+        __this_cpu_write(mod->refptr->incs, 1);
         /* Backwards compatibility macros put refcount during init. */
         mod->waiter = current;
 }
@@ -616,12 +666,28 @@ static int try_stop_module(struct module *mod, int flags, int *forced)
 
 unsigned int module_refcount(struct module *mod)
 {
-        unsigned int total = 0;
+        unsigned int incs = 0, decs = 0;
         int cpu;
 
         for_each_possible_cpu(cpu)
-                total += per_cpu_ptr(mod->refptr, cpu)->count;
-        return total;
+                decs += per_cpu_ptr(mod->refptr, cpu)->decs;
+        /*
+         * ensure the incs are added up after the decs.
+         * module_put ensures incs are visible before decs with smp_wmb.
+         *
+         * This 2-count scheme avoids the situation where the refcount
+         * for CPU0 is read, then CPU0 increments the module refcount,
+         * then CPU1 drops that refcount, then the refcount for CPU1 is
+         * read. We would record a decrement but not its corresponding
+         * increment so we would see a low count (disaster).
+         *
+         * Rare situation? But module_refcount can be preempted, and we
+         * might be tallying up 4096+ CPUs. So it is not impossible.
+         */
+        smp_rmb();
+        for_each_possible_cpu(cpu)
+                incs += per_cpu_ptr(mod->refptr, cpu)->incs;
+        return incs - decs;
 }
 EXPORT_SYMBOL(module_refcount);
 
@@ -798,10 +864,11 @@ void module_put(struct module *module)
 {
         if (module) {
                 preempt_disable();
-                __this_cpu_dec(module->refptr->count);
+                smp_wmb(); /* see comment in module_refcount */
+                __this_cpu_inc(module->refptr->decs);
 
                 trace_module_put(module, _RET_IP_,
-                                 __this_cpu_read(module->refptr->count));
+                                 __this_cpu_read(module->refptr->decs));
                 /* Maybe they're waiting for us to drop reference? */
                 if (unlikely(!module_is_live(module)))
                         wake_up_process(module->waiter);
@@ -1085,6 +1152,7 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
                 if (sattr->name == NULL)
                         goto out;
                 sect_attrs->nsections++;
+                sysfs_attr_init(&sattr->mattr.attr);
                 sattr->mattr.show = module_sect_show;
                 sattr->mattr.store = NULL;
                 sattr->mattr.attr.name = sattr->name;
@@ -1180,6 +1248,7 @@ static void add_notes_attrs(struct module *mod, unsigned int nsect,
                 if (sect_empty(&sechdrs[i]))
                         continue;
                 if (sechdrs[i].sh_type == SHT_NOTE) {
+                        sysfs_bin_attr_init(nattr);
                         nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
                         nattr->attr.mode = S_IRUGO;
                         nattr->size = sechdrs[i].sh_size;
@@ -1252,6 +1321,7 @@ int module_add_modinfo_attrs(struct module *mod)
                 if (!attr->test ||
                     (attr->test && attr->test(mod))) {
                         memcpy(temp_attr, attr, sizeof(*temp_attr));
+                        sysfs_attr_init(&temp_attr->attr);
                         error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
                         ++temp_attr;
                 }
@@ -1397,8 +1467,7 @@ static void free_module(struct module *mod)
         /* This may be NULL, but that's OK */
         module_free(mod, mod->module_init);
         kfree(mod->args);
-        if (mod->percpu)
-                percpu_modfree(mod->percpu);
+        percpu_modfree(mod);
 #if defined(CONFIG_MODULE_UNLOAD)
         if (mod->refptr)
                 free_percpu(mod->refptr);
@@ -1517,7 +1586,7 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
                 default:
                         /* Divert to percpu allocation if a percpu var. */
                         if (sym[i].st_shndx == pcpuindex)
-                                secbase = (unsigned long)mod->percpu;
+                                secbase = (unsigned long)mod_percpu(mod);
                         else
                                 secbase = sechdrs[sym[i].st_shndx].sh_addr;
                         sym[i].st_value += secbase;
@@ -1951,7 +2020,7 @@ static noinline struct module *load_module(void __user *umod,
         unsigned int modindex, versindex, infoindex, pcpuindex;
         struct module *mod;
         long err = 0;
-        void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
+        void *ptr = NULL; /* Stops spurious gcc warning */
         unsigned long symoffs, stroffs, *strmap;
 
         mm_segment_t old_fs;
@@ -2091,15 +2160,11 @@ static noinline struct module *load_module(void __user *umod,
 
         if (pcpuindex) {
                 /* We have a special allocation for this section. */
-                percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
-                                         sechdrs[pcpuindex].sh_addralign,
-                                         mod->name);
-                if (!percpu) {
-                        err = -ENOMEM;
+                err = percpu_modalloc(mod, sechdrs[pcpuindex].sh_size,
+                                      sechdrs[pcpuindex].sh_addralign);
+                if (err)
                         goto free_mod;
-                }
                 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
-                mod->percpu = percpu;
         }
 
         /* Determine total sizes, and put offsets in sh_entsize.  For now
@@ -2314,7 +2379,7 @@ static noinline struct module *load_module(void __user *umod,
         sort_extable(mod->extable, mod->extable + mod->num_exentries);
 
         /* Finally, copy percpu area over. */
-        percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
+        percpu_modcopy(mod, (void *)sechdrs[pcpuindex].sh_addr,
                        sechdrs[pcpuindex].sh_size);
 
         add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
@@ -2406,8 +2471,7 @@ static noinline struct module *load_module(void __user *umod,
         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);
+        percpu_modfree(mod);
  free_mod:
         kfree(args);
         kfree(strmap);
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index 09b4ff9711b2..f74e6c00e26d 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -13,6 +13,7 @@
  *             Pavel Emelianov <xemul@openvz.org>
  */
 
+#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/nsproxy.h>
 #include <linux/init_task.h>
@@ -24,7 +25,18 @@
 
 static struct kmem_cache *nsproxy_cachep;
 
-struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy);
+struct nsproxy init_nsproxy = {
+        .count  = ATOMIC_INIT(1),
+        .uts_ns = &init_uts_ns,
+#if defined(CONFIG_POSIX_MQUEUE) || defined(CONFIG_SYSVIPC)
+        .ipc_ns = &init_ipc_ns,
+#endif
+        .mnt_ns = NULL,
+        .pid_ns = &init_pid_ns,
+#ifdef CONFIG_NET
+        .net_ns = &init_net,
+#endif
+};
 
 static inline struct nsproxy *create_nsproxy(void)
 {
diff --git a/kernel/padata.c b/kernel/padata.c
index 5085046d83fb..5b44d0fa358e 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -25,6 +25,7 @@
 #include <linux/padata.h>
 #include <linux/mutex.h>
 #include <linux/sched.h>
+#include <linux/slab.h>
 #include <linux/rcupdate.h>
 
 #define MAX_SEQ_NR INT_MAX - NR_CPUS
@@ -642,6 +643,9 @@ struct padata_instance *padata_alloc(const struct cpumask *cpumask,
         if (!pd)
                 goto err_free_inst;
 
+        if (!alloc_cpumask_var(&pinst->cpumask, GFP_KERNEL))
+                goto err_free_pd;
+
         rcu_assign_pointer(pinst->pd, pd);
 
         pinst->wq = wq;
@@ -654,12 +658,14 @@ struct padata_instance *padata_alloc(const struct cpumask *cpumask,
         pinst->cpu_notifier.priority = 0;
         err = register_hotcpu_notifier(&pinst->cpu_notifier);
         if (err)
-                goto err_free_pd;
+                goto err_free_cpumask;
 
         mutex_init(&pinst->lock);
 
         return pinst;
 
+err_free_cpumask:
+        free_cpumask_var(pinst->cpumask);
 err_free_pd:
         padata_free_pd(pd);
 err_free_inst:
@@ -685,6 +691,7 @@ void padata_free(struct padata_instance *pinst)
 
         unregister_hotcpu_notifier(&pinst->cpu_notifier);
         padata_free_pd(pinst->pd);
+        free_cpumask_var(pinst->cpumask);
         kfree(pinst);
 }
 EXPORT_SYMBOL(padata_free);
diff --git a/kernel/panic.c b/kernel/panic.c
index c787333282b8..13d966b4c14a 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -36,15 +36,36 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
 
 EXPORT_SYMBOL(panic_notifier_list);
 
-static long no_blink(long time)
-{
-        return 0;
-}
-
 /* Returns how long it waited in ms */
 long (*panic_blink)(long time);
 EXPORT_SYMBOL(panic_blink);
 
+static void panic_blink_one_second(void)
+{
+        static long i = 0, end;
+
+        if (panic_blink) {
+                end = i + MSEC_PER_SEC;
+
+                while (i < end) {
+                        i += panic_blink(i);
+                        mdelay(1);
+                        i++;
+                }
+        } else {
+                /*
+                 * When running under a hypervisor a small mdelay may get
+                 * rounded up to the hypervisor timeslice. For example, with
+                 * a 1ms in 10ms hypervisor timeslice we might inflate a
+                 * mdelay(1) loop by 10x.
+                 *
+                 * If we have nothing to blink, spin on 1 second calls to
+                 * mdelay to avoid this.
+                 */
+                mdelay(MSEC_PER_SEC);
+        }
+}
+
 /**
  *      panic - halt the system
  *      @fmt: The text string to print
@@ -95,9 +116,6 @@ NORET_TYPE void panic(const char * fmt, ...)
 
         bust_spinlocks(0);
 
-        if (!panic_blink)
-                panic_blink = no_blink;
-
         if (panic_timeout > 0) {
                 /*
                  * Delay timeout seconds before rebooting the machine.
@@ -105,11 +123,9 @@ NORET_TYPE void panic(const char * fmt, ...)
                  */
                 printk(KERN_EMERG "Rebooting in %d seconds..", panic_timeout);
 
-                for (i = 0; i < panic_timeout*1000; ) {
+                for (i = 0; i < panic_timeout; i++) {
                         touch_nmi_watchdog();
-                        i += panic_blink(i);
-                        mdelay(1);
-                        i++;
+                        panic_blink_one_second();
                 }
                 /*
                  * This will not be a clean reboot, with everything
@@ -135,11 +151,9 @@ NORET_TYPE void panic(const char * fmt, ...)
         }
 #endif
         local_irq_enable();
-        for (i = 0; ; ) {
+        while (1) {
                 touch_softlockup_watchdog();
-                i += panic_blink(i);
-                mdelay(1);
-                i++;
+                panic_blink_one_second();
         }
 }
 
diff --git a/kernel/params.c b/kernel/params.c
index cf1b69183127..0b30ecd53a52 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -24,7 +24,6 @@
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/ctype.h>
-#include <linux/string.h>
 
 #if 0
 #define DEBUGP printk
@@ -402,8 +401,8 @@ int param_get_string(char *buffer, struct kernel_param *kp)
 }
 
 /* sysfs output in /sys/modules/XYZ/parameters/ */
-#define to_module_attr(n) container_of(n, struct module_attribute, attr);
-#define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
+#define to_module_attr(n) container_of(n, struct module_attribute, attr)
+#define to_module_kobject(n) container_of(n, struct module_kobject, kobj)
 
 extern struct kernel_param __start___param[], __stop___param[];
 
@@ -421,7 +420,7 @@ struct module_param_attrs
 };
 
 #ifdef CONFIG_SYSFS
-#define to_param_attr(n) container_of(n, struct param_attribute, mattr);
+#define to_param_attr(n) container_of(n, struct param_attribute, mattr)
 
 static ssize_t param_attr_show(struct module_attribute *mattr,
                                struct module *mod, char *buf)
@@ -517,6 +516,7 @@ static __modinit int add_sysfs_param(struct module_kobject *mk,
         new->grp.attrs = attrs;
 
         /* Tack new one on the end. */
+        sysfs_attr_init(&new->attrs[num].mattr.attr);
         new->attrs[num].param = kp;
         new->attrs[num].mattr.show = param_attr_show;
         new->attrs[num].mattr.store = param_attr_store;
@@ -723,7 +723,7 @@ static ssize_t module_attr_store(struct kobject *kobj,
         return ret;
 }
 
-static struct sysfs_ops module_sysfs_ops = {
+static const struct sysfs_ops module_sysfs_ops = {
         .show = module_attr_show,
         .store = module_attr_store,
 };
@@ -737,7 +737,7 @@ static int uevent_filter(struct kset *kset, struct kobject *kobj)
         return 0;
 }
 
-static struct kset_uevent_ops module_uevent_ops = {
+static const struct kset_uevent_ops module_uevent_ops = {
         .filter = uevent_filter,
 };
 
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index a661e7991865..2f3fbf84215a 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -15,6 +15,7 @@
 #include <linux/smp.h>
 #include <linux/file.h>
 #include <linux/poll.h>
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/dcache.h>
 #include <linux/percpu.h>
@@ -56,21 +57,6 @@ static atomic_t nr_task_events __read_mostly;
  */
 int sysctl_perf_event_paranoid __read_mostly = 1;
 
-static inline bool perf_paranoid_tracepoint_raw(void)
-{
-        return sysctl_perf_event_paranoid > -1;
-}
-
-static inline bool perf_paranoid_cpu(void)
-{
-        return sysctl_perf_event_paranoid > 0;
-}
-
-static inline bool perf_paranoid_kernel(void)
-{
-        return sysctl_perf_event_paranoid > 1;
-}
-
 int sysctl_perf_event_mlock __read_mostly = 512; /* 'free' kb per user */
 
 /*
@@ -96,10 +82,6 @@ extern __weak const struct pmu *hw_perf_event_init(struct perf_event *event)
 void __weak hw_perf_disable(void)               { barrier(); }
 void __weak hw_perf_enable(void)                { barrier(); }
 
-void __weak hw_perf_event_setup(int cpu)        { barrier(); }
-void __weak hw_perf_event_setup_online(int cpu) { barrier(); }
-void __weak hw_perf_event_setup_offline(int cpu)        { barrier(); }
-
 int __weak
 hw_perf_group_sched_in(struct perf_event *group_leader,
                struct perf_cpu_context *cpuctx,
@@ -112,25 +94,15 @@ void __weak perf_event_print_debug(void)	{ }
 
 static DEFINE_PER_CPU(int, perf_disable_count);
 
-void __perf_disable(void)
-{
-        __get_cpu_var(perf_disable_count)++;
-}
-
-bool __perf_enable(void)
-{
-        return !--__get_cpu_var(perf_disable_count);
-}
-
 void perf_disable(void)
 {
-        __perf_disable();
-        hw_perf_disable();
+        if (!__get_cpu_var(perf_disable_count)++)
+                hw_perf_disable();
 }
 
 void perf_enable(void)
 {
-        if (__perf_enable())
+        if (!--__get_cpu_var(perf_disable_count))
                 hw_perf_enable();
 }
 
@@ -1193,11 +1165,9 @@ void perf_event_task_sched_out(struct task_struct *task,
         struct perf_event_context *ctx = task->perf_event_ctxp;
         struct perf_event_context *next_ctx;
         struct perf_event_context *parent;
-        struct pt_regs *regs;
         int do_switch = 1;
 
-        regs = task_pt_regs(task);
-        perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 1, regs, 0);
+        perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 1, NULL, 0);
 
         if (likely(!ctx || !cpuctx->task_ctx))
                 return;
@@ -1553,12 +1523,15 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
                  */
                 if (interrupts == MAX_INTERRUPTS) {
                         perf_log_throttle(event, 1);
+                        perf_disable();
                         event->pmu->unthrottle(event);
+                        perf_enable();
                 }
 
                 if (!event->attr.freq || !event->attr.sample_freq)
                         continue;
 
+                perf_disable();
                 event->pmu->read(event);
                 now = atomic64_read(&event->count);
                 delta = now - hwc->freq_count_stamp;
@@ -1566,6 +1539,7 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
 
                 if (delta > 0)
                         perf_adjust_period(event, TICK_NSEC, delta);
+                perf_enable();
         }
         raw_spin_unlock(&ctx->lock);
 }
@@ -1575,9 +1549,6 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
  */
 static void rotate_ctx(struct perf_event_context *ctx)
 {
-        if (!ctx->nr_events)
-                return;
-
         raw_spin_lock(&ctx->lock);
 
         /* Rotate the first entry last of non-pinned groups */
@@ -1590,19 +1561,28 @@ void perf_event_task_tick(struct task_struct *curr)
 {
         struct perf_cpu_context *cpuctx;
         struct perf_event_context *ctx;
+        int rotate = 0;
 
         if (!atomic_read(&nr_events))
                 return;
 
         cpuctx = &__get_cpu_var(perf_cpu_context);
-        ctx = curr->perf_event_ctxp;
+        if (cpuctx->ctx.nr_events &&
+            cpuctx->ctx.nr_events != cpuctx->ctx.nr_active)
+                rotate = 1;
 
-        perf_disable();
+        ctx = curr->perf_event_ctxp;
+        if (ctx && ctx->nr_events && ctx->nr_events != ctx->nr_active)
+                rotate = 1;
 
         perf_ctx_adjust_freq(&cpuctx->ctx);
         if (ctx)
                 perf_ctx_adjust_freq(ctx);
 
+        if (!rotate)
+                return;
+
+        perf_disable();
         cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
         if (ctx)
                 task_ctx_sched_out(ctx, EVENT_FLEXIBLE);
@@ -1614,7 +1594,6 @@ void perf_event_task_tick(struct task_struct *curr)
         cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE);
         if (ctx)
                 task_ctx_sched_in(curr, EVENT_FLEXIBLE);
-
         perf_enable();
 }
 
@@ -2610,7 +2589,7 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
         if (user_locked > user_lock_limit)
                 extra = user_locked - user_lock_limit;
 
-        lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur;
+        lock_limit = rlimit(RLIMIT_MEMLOCK);
         lock_limit >>= PAGE_SHIFT;
         locked = vma->vm_mm->locked_vm + extra;
 
@@ -2806,6 +2785,12 @@ __weak struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
         return NULL;
 }
 
+__weak
+void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip)
+{
+}
+
+
 /*
  * Output
  */
@@ -3391,15 +3376,23 @@ static void perf_event_task_output(struct perf_event *event,
                                      struct perf_task_event *task_event)
 {
         struct perf_output_handle handle;
-        int size;
         struct task_struct *task = task_event->task;
-        int ret;
+        unsigned long flags;
+        int size, ret;
+
+        /*
+         * If this CPU attempts to acquire an rq lock held by a CPU spinning
+         * in perf_output_lock() from interrupt context, it's game over.
+         */
+        local_irq_save(flags);
 
         size  = task_event->event_id.header.size;
         ret = perf_output_begin(&handle, event, size, 0, 0);
 
-        if (ret)
+        if (ret) {
+                local_irq_restore(flags);
                 return;
+        }
 
         task_event->event_id.pid = perf_event_pid(event, task);
         task_event->event_id.ppid = perf_event_pid(event, current);
@@ -3410,6 +3403,7 @@ static void perf_event_task_output(struct perf_event *event,
         perf_output_put(&handle, task_event->event_id);
 
         perf_output_end(&handle);
+        local_irq_restore(flags);
 }
 
 static int perf_event_task_match(struct perf_event *event)
@@ -4123,8 +4117,7 @@ void __perf_sw_event(u32 event_id, u64 nr, int nmi,
         if (rctx < 0)
                 return;
 
-        data.addr = addr;
-        data.raw  = NULL;
+        perf_sample_data_init(&data, addr);
 
         do_perf_sw_event(PERF_TYPE_SOFTWARE, event_id, nr, nmi, &data, regs);
 
@@ -4169,11 +4162,10 @@ static enum hrtimer_restart perf_swevent_hrtimer(struct hrtimer *hrtimer)
         struct perf_event *event;
         u64 period;
 
-        event   = container_of(hrtimer, struct perf_event, hw.hrtimer);
+        event = container_of(hrtimer, struct perf_event, hw.hrtimer);
         event->pmu->read(event);
 
-        data.addr = 0;
-        data.raw = NULL;
+        perf_sample_data_init(&data, 0);
         data.period = event->hw.last_period;
         regs = get_irq_regs();
         /*
@@ -4335,26 +4327,20 @@ static const struct pmu perf_ops_task_clock = {
 #ifdef CONFIG_EVENT_TRACING
 
 void perf_tp_event(int event_id, u64 addr, u64 count, void *record,
-                          int entry_size)
+                   int entry_size, struct pt_regs *regs)
 {
+        struct perf_sample_data data;
         struct perf_raw_record raw = {
                 .size = entry_size,
                 .data = record,
         };
 
-        struct perf_sample_data data = {
-                .addr = addr,
-                .raw = &raw,
-        };
-
-        struct pt_regs *regs = get_irq_regs();
-
-        if (!regs)
-                regs = task_pt_regs(current);
+        perf_sample_data_init(&data, addr);
+        data.raw = &raw;
 
         /* Trace events already protected against recursion */
         do_perf_sw_event(PERF_TYPE_TRACEPOINT, event_id, count, 1,
-                                &data, regs);
+                         &data, regs);
 }
 EXPORT_SYMBOL_GPL(perf_tp_event);
 
@@ -4370,7 +4356,7 @@ static int perf_tp_event_match(struct perf_event *event,
 
 static void tp_perf_event_destroy(struct perf_event *event)
 {
-        ftrace_profile_disable(event->attr.config);
+        perf_trace_disable(event->attr.config);
 }
 
 static const struct pmu *tp_perf_event_init(struct perf_event *event)
@@ -4384,7 +4370,7 @@ static const struct pmu *tp_perf_event_init(struct perf_event *event)
                         !capable(CAP_SYS_ADMIN))
                 return ERR_PTR(-EPERM);
 
-        if (ftrace_profile_enable(event->attr.config))
+        if (perf_trace_enable(event->attr.config))
                 return NULL;
 
         event->destroy = tp_perf_event_destroy;
@@ -4463,8 +4449,7 @@ void perf_bp_event(struct perf_event *bp, void *data)
         struct perf_sample_data sample;
         struct pt_regs *regs = data;
 
-        sample.raw = NULL;
-        sample.addr = bp->attr.bp_addr;
+        perf_sample_data_init(&sample, bp->attr.bp_addr);
 
         if (!perf_exclude_event(bp, regs))
                 perf_swevent_add(bp, 1, 1, &sample, regs);
@@ -5392,18 +5377,26 @@ int perf_event_init_task(struct task_struct *child)
         return ret;
 }
 
+static void __init perf_event_init_all_cpus(void)
+{
+        int cpu;
+        struct perf_cpu_context *cpuctx;
+
+        for_each_possible_cpu(cpu) {
+                cpuctx = &per_cpu(perf_cpu_context, cpu);
+                __perf_event_init_context(&cpuctx->ctx, NULL);
+        }
+}
+
 static void __cpuinit perf_event_init_cpu(int cpu)
 {
         struct perf_cpu_context *cpuctx;
 
         cpuctx = &per_cpu(perf_cpu_context, cpu);
-        __perf_event_init_context(&cpuctx->ctx, NULL);
 
         spin_lock(&perf_resource_lock);
         cpuctx->max_pertask = perf_max_events - perf_reserved_percpu;
         spin_unlock(&perf_resource_lock);
-
-        hw_perf_event_setup(cpu);
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
@@ -5443,20 +5436,11 @@ perf_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
                 perf_event_init_cpu(cpu);
                 break;
 
-        case CPU_ONLINE:
-        case CPU_ONLINE_FROZEN:
-                hw_perf_event_setup_online(cpu);
-                break;
-
         case CPU_DOWN_PREPARE:
         case CPU_DOWN_PREPARE_FROZEN:
                 perf_event_exit_cpu(cpu);
                 break;
 
-        case CPU_DEAD:
-                hw_perf_event_setup_offline(cpu);
-                break;
-
         default:
                 break;
         }
@@ -5474,6 +5458,7 @@ static struct notifier_block __cpuinitdata perf_cpu_nb = {
 
 void __init perf_event_init(void)
 {
+        perf_event_init_all_cpus();
         perf_cpu_notify(&perf_cpu_nb, (unsigned long)CPU_UP_PREPARE,
                         (void *)(long)smp_processor_id());
         perf_cpu_notify(&perf_cpu_nb, (unsigned long)CPU_ONLINE,
@@ -5481,13 +5466,16 @@ void __init perf_event_init(void)
         register_cpu_notifier(&perf_cpu_nb);
 }
 
-static ssize_t perf_show_reserve_percpu(struct sysdev_class *class, char *buf)
+static ssize_t perf_show_reserve_percpu(struct sysdev_class *class,
+                                        struct sysdev_class_attribute *attr,
+                                        char *buf)
 {
         return sprintf(buf, "%d\n", perf_reserved_percpu);
 }
 
 static ssize_t
 perf_set_reserve_percpu(struct sysdev_class *class,
+                        struct sysdev_class_attribute *attr,
                         const char *buf,
                         size_t count)
 {
@@ -5516,13 +5504,17 @@ perf_set_reserve_percpu(struct sysdev_class *class,
         return count;
 }
 
-static ssize_t perf_show_overcommit(struct sysdev_class *class, char *buf)
+static ssize_t perf_show_overcommit(struct sysdev_class *class,
+                                    struct sysdev_class_attribute *attr,
+                                    char *buf)
 {
         return sprintf(buf, "%d\n", perf_overcommit);
 }
 
 static ssize_t
-perf_set_overcommit(struct sysdev_class *class, const char *buf, size_t count)
+perf_set_overcommit(struct sysdev_class *class,
+                    struct sysdev_class_attribute *attr,
+                    const char *buf, size_t count)
 {
         unsigned long val;
         int err;
diff --git a/kernel/pid.c b/kernel/pid.c
index b08e697cd83f..aebb30d9c233 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -367,7 +367,9 @@ struct task_struct *pid_task(struct pid *pid, enum pid_type type)
         struct task_struct *result = NULL;
         if (pid) {
                 struct hlist_node *first;
-                first = rcu_dereference_check(pid->tasks[type].first, rcu_read_lock_held() || lockdep_is_held(&tasklist_lock));
+                first = rcu_dereference_check(pid->tasks[type].first,
+                                              rcu_read_lock_held() ||
+                                              lockdep_tasklist_lock_is_held());
                 if (first)
                         result = hlist_entry(first, struct task_struct, pids[(type)].node);
         }
@@ -376,7 +378,7 @@ struct task_struct *pid_task(struct pid *pid, enum pid_type type)
 EXPORT_SYMBOL(pid_task);
 
 /*
- * Must be called under rcu_read_lock() or with tasklist_lock read-held.
+ * Must be called under rcu_read_lock().
  */
 struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns)
 {
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 86b3796b0436..a5aff94e1f0b 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -13,6 +13,7 @@
 #include <linux/syscalls.h>
 #include <linux/err.h>
 #include <linux/acct.h>
+#include <linux/slab.h>
 
 #define BITS_PER_PAGE           (PAGE_SIZE*8)
 
@@ -161,13 +162,12 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
                 rcu_read_lock();
 
                 /*
-                 * Use force_sig() since it clears SIGNAL_UNKILLABLE ensuring
-                 * any nested-container's init processes don't ignore the
-                 * signal
+                 * Any nested-container's init processes won't ignore the
+                 * SEND_SIG_NOINFO signal, see send_signal()->si_fromuser().
                  */
                 task = pid_task(find_vpid(nr), PIDTYPE_PID);
                 if (task)
-                        force_sig(SIGKILL, task);
+                        send_sig_info(SIGKILL, SEND_SIG_NOINFO, task);
 
                 rcu_read_unlock();
 
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 438ff4523513..bc7704b3a443 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -982,6 +982,7 @@ static void check_thread_timers(struct task_struct *tsk,
         int maxfire;
         struct list_head *timers = tsk->cpu_timers;
         struct signal_struct *const sig = tsk->signal;
+        unsigned long soft;
 
         maxfire = 20;
         tsk->cputime_expires.prof_exp = cputime_zero;
@@ -1030,9 +1031,10 @@ static void check_thread_timers(struct task_struct *tsk,
         /*
          * Check for the special case thread timers.
          */
-        if (sig->rlim[RLIMIT_RTTIME].rlim_cur != RLIM_INFINITY) {
-                unsigned long hard = sig->rlim[RLIMIT_RTTIME].rlim_max;
-                unsigned long *soft = &sig->rlim[RLIMIT_RTTIME].rlim_cur;
+        soft = ACCESS_ONCE(sig->rlim[RLIMIT_RTTIME].rlim_cur);
+        if (soft != RLIM_INFINITY) {
+                unsigned long hard =
+                        ACCESS_ONCE(sig->rlim[RLIMIT_RTTIME].rlim_max);
 
                 if (hard != RLIM_INFINITY &&
                     tsk->rt.timeout > DIV_ROUND_UP(hard, USEC_PER_SEC/HZ)) {
@@ -1043,14 +1045,13 @@ static void check_thread_timers(struct task_struct *tsk,
                         __group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk);
                         return;
                 }
-                if (tsk->rt.timeout > DIV_ROUND_UP(*soft, USEC_PER_SEC/HZ)) {
+                if (tsk->rt.timeout > DIV_ROUND_UP(soft, USEC_PER_SEC/HZ)) {
                         /*
                          * At the soft limit, send a SIGXCPU every second.
                          */
-                        if (sig->rlim[RLIMIT_RTTIME].rlim_cur
-                            < sig->rlim[RLIMIT_RTTIME].rlim_max) {
-                                sig->rlim[RLIMIT_RTTIME].rlim_cur +=
-                                                                USEC_PER_SEC;
+                        if (soft < hard) {
+                                soft += USEC_PER_SEC;
+                                sig->rlim[RLIMIT_RTTIME].rlim_cur = soft;
                         }
                         printk(KERN_INFO
                                 "RT Watchdog Timeout: %s[%d]\n",
@@ -1060,9 +1061,9 @@ static void check_thread_timers(struct task_struct *tsk,
         }
 }
 
-static void stop_process_timers(struct task_struct *tsk)
+static void stop_process_timers(struct signal_struct *sig)
 {
-        struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
+        struct thread_group_cputimer *cputimer = &sig->cputimer;
         unsigned long flags;
 
         if (!cputimer->running)
@@ -1071,6 +1072,10 @@ static void stop_process_timers(struct task_struct *tsk)
         spin_lock_irqsave(&cputimer->lock, flags);
         cputimer->running = 0;
         spin_unlock_irqrestore(&cputimer->lock, flags);
+
+        sig->cputime_expires.prof_exp = cputime_zero;
+        sig->cputime_expires.virt_exp = cputime_zero;
+        sig->cputime_expires.sched_exp = 0;
 }
 
 static u32 onecputick;
@@ -1121,6 +1126,7 @@ static void check_process_timers(struct task_struct *tsk,
         unsigned long long sum_sched_runtime, sched_expires;
         struct list_head *timers = sig->cpu_timers;
         struct task_cputime cputime;
+        unsigned long soft;
 
         /*
          * Don't sample the current process CPU clocks if there are no timers.
@@ -1131,7 +1137,7 @@ static void check_process_timers(struct task_struct *tsk,
             list_empty(&timers[CPUCLOCK_VIRT]) &&
             cputime_eq(sig->it[CPUCLOCK_VIRT].expires, cputime_zero) &&
             list_empty(&timers[CPUCLOCK_SCHED])) {
-                stop_process_timers(tsk);
+                stop_process_timers(sig);
                 return;
         }
 
@@ -1193,11 +1199,13 @@ static void check_process_timers(struct task_struct *tsk,
                          SIGPROF);
         check_cpu_itimer(tsk, &sig->it[CPUCLOCK_VIRT], &virt_expires, utime,
                          SIGVTALRM);
-
-        if (sig->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
+        soft = ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_cur);
+        if (soft != RLIM_INFINITY) {
                 unsigned long psecs = cputime_to_secs(ptime);
+                unsigned long hard =
+                        ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_max);
                 cputime_t x;
-                if (psecs >= sig->rlim[RLIMIT_CPU].rlim_max) {
+                if (psecs >= hard) {
                         /*
                          * At the hard limit, we just die.
                          * No need to calculate anything else now.
@@ -1205,17 +1213,17 @@ static void check_process_timers(struct task_struct *tsk,
                         __group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk);
                         return;
                 }
-                if (psecs >= sig->rlim[RLIMIT_CPU].rlim_cur) {
+                if (psecs >= soft) {
                         /*
                          * At the soft limit, send a SIGXCPU every second.
                          */
                         __group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk);
-                        if (sig->rlim[RLIMIT_CPU].rlim_cur
-                            < sig->rlim[RLIMIT_CPU].rlim_max) {
-                                sig->rlim[RLIMIT_CPU].rlim_cur++;
+                        if (soft < hard) {
+                                soft++;
+                                sig->rlim[RLIMIT_CPU].rlim_cur = soft;
                         }
                 }
-                x = secs_to_cputime(sig->rlim[RLIMIT_CPU].rlim_cur);
+                x = secs_to_cputime(soft);
                 if (cputime_eq(prof_expires, cputime_zero) ||
                     cputime_lt(x, prof_expires)) {
                         prof_expires = x;
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index bbfe472d7524..aa9e916da4d5 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -22,6 +22,7 @@
 #include <linux/console.h>
 #include <linux/cpu.h>
 #include <linux/freezer.h>
+#include <linux/gfp.h>
 #include <scsi/scsi_scan.h>
 #include <asm/suspend.h>
 
@@ -323,6 +324,7 @@ static int create_image(int platform_mode)
 int hibernation_snapshot(int platform_mode)
 {
         int error;
+        gfp_t saved_mask;
 
         error = platform_begin(platform_mode);
         if (error)
@@ -334,6 +336,7 @@ int hibernation_snapshot(int platform_mode)
                 goto Close;
 
         suspend_console();
+        saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
         error = dpm_suspend_start(PMSG_FREEZE);
         if (error)
                 goto Recover_platform;
@@ -351,6 +354,7 @@ int hibernation_snapshot(int platform_mode)
 
         dpm_resume_end(in_suspend ?
                 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
+        set_gfp_allowed_mask(saved_mask);
         resume_console();
  Close:
         platform_end(platform_mode);
@@ -445,14 +449,17 @@ static int resume_target_kernel(bool platform_mode)
 int hibernation_restore(int platform_mode)
 {
         int error;
+        gfp_t saved_mask;
 
         pm_prepare_console();
         suspend_console();
+        saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
         error = dpm_suspend_start(PMSG_QUIESCE);
         if (!error) {
                 error = resume_target_kernel(platform_mode);
                 dpm_resume_end(PMSG_RECOVER);
         }
+        set_gfp_allowed_mask(saved_mask);
         resume_console();
         pm_restore_console();
         return error;
@@ -466,6 +473,7 @@ int hibernation_restore(int platform_mode)
 int hibernation_platform_enter(void)
 {
         int error;
+        gfp_t saved_mask;
 
         if (!hibernation_ops)
                 return -ENOSYS;
@@ -481,6 +489,7 @@ int hibernation_platform_enter(void)
 
         entering_platform_hibernation = true;
         suspend_console();
+        saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
         error = dpm_suspend_start(PMSG_HIBERNATE);
         if (error) {
                 if (hibernation_ops->recover)
@@ -518,6 +527,7 @@ int hibernation_platform_enter(void)
  Resume_devices:
         entering_platform_hibernation = false;
         dpm_resume_end(PMSG_RESTORE);
+        set_gfp_allowed_mask(saved_mask);
         resume_console();
 
  Close:
diff --git a/kernel/power/hibernate_nvs.c b/kernel/power/hibernate_nvs.c
index 39ac698ef836..fdcad9ed5a7b 100644
--- a/kernel/power/hibernate_nvs.c
+++ b/kernel/power/hibernate_nvs.c
@@ -10,6 +10,7 @@
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/mm.h>
+#include <linux/slab.h>
 #include <linux/suspend.h>
 
 /*
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 5ade1bdcf366..71ae29052ab6 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -88,12 +88,11 @@ static int try_to_freeze_tasks(bool sig_only)
                 printk(KERN_ERR "Freezing of tasks failed after %d.%02d seconds "
                                 "(%d tasks refusing to freeze):\n",
                                 elapsed_csecs / 100, elapsed_csecs % 100, todo);
-                show_state();
                 read_lock(&tasklist_lock);
                 do_each_thread(g, p) {
                         task_lock(p);
                         if (freezing(p) && !freezer_should_skip(p))
-                                printk(KERN_ERR " %s\n", p->comm);
+                                sched_show_task(p);
                         cancel_freezing(p);
                         task_unlock(p);
                 } while_each_thread(g, p);
@@ -145,7 +144,7 @@ static void thaw_tasks(bool nosig_only)
                 if (nosig_only && should_send_signal(p))
                         continue;
 
-                if (cgroup_frozen(p))
+                if (cgroup_freezing_or_frozen(p))
                         continue;
 
                 thaw_process(p);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 830cadecbdfc..be861c26dda7 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -26,6 +26,7 @@
 #include <linux/console.h>
 #include <linux/highmem.h>
 #include <linux/list.h>
+#include <linux/slab.h>
 
 #include <asm/uaccess.h>
 #include <asm/mmu_context.h>
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 6f10dfc2d3e9..56e7dbb8b996 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -15,6 +15,7 @@
 #include <linux/console.h>
 #include <linux/cpu.h>
 #include <linux/syscalls.h>
+#include <linux/gfp.h>
 
 #include "power.h"
 
@@ -189,6 +190,7 @@ static int suspend_enter(suspend_state_t state)
 int suspend_devices_and_enter(suspend_state_t state)
 {
         int error;
+        gfp_t saved_mask;
 
         if (!suspend_ops)
                 return -ENOSYS;
@@ -199,6 +201,7 @@ int suspend_devices_and_enter(suspend_state_t state)
                         goto Close;
         }
         suspend_console();
+        saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
         suspend_test_start();
         error = dpm_suspend_start(PMSG_SUSPEND);
         if (error) {
@@ -215,6 +218,7 @@ int suspend_devices_and_enter(suspend_state_t state)
         suspend_test_start();
         dpm_resume_end(PMSG_RESUME);
         suspend_test_finish("resume devices");
+        set_gfp_allowed_mask(saved_mask);
         resume_console();
  Close:
         if (suspend_ops->end)
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 1d575733d4e1..66824d71983a 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -23,6 +23,7 @@
 #include <linux/swap.h>
 #include <linux/swapops.h>
 #include <linux/pm.h>
+#include <linux/slab.h>
 
 #include "power.h"
 
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 4d2289626a84..a8c96212bc1b 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -420,7 +420,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
                          * User space encodes device types as two-byte values,
                          * so we need to recode them
                          */
-                        swdev = old_decode_dev(swap_area.dev);
+                        swdev = new_decode_dev(swap_area.dev);
                         if (swdev) {
                                 offset = swap_area.offset;
                                 data->swap = swap_type_of(swdev, offset, NULL);
diff --git a/kernel/printk.c b/kernel/printk.c
index 40674122ecf2..75077ad0b537 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -70,8 +70,6 @@ int console_printk[4] = {
         DEFAULT_CONSOLE_LOGLEVEL,       /* default_console_loglevel */
 };
 
-static int saved_console_loglevel = -1;
-
 /*
  * Low level drivers may need that to know if they can schedule in
  * their unblank() callback or not. So let's export it.
@@ -146,6 +144,7 @@ static char __log_buf[__LOG_BUF_LEN];
 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 */
+static int saved_console_loglevel = -1;
 
 #ifdef CONFIG_KEXEC
 /*
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index f1125c1a6321..03a7ea1579f6 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -45,6 +45,7 @@
 #include <linux/mutex.h>
 #include <linux/module.h>
 #include <linux/kernel_stat.h>
+#include <linux/hardirq.h>
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 static struct lock_class_key rcu_lock_key;
@@ -66,6 +67,35 @@ EXPORT_SYMBOL_GPL(rcu_sched_lock_map);
 int rcu_scheduler_active __read_mostly;
 EXPORT_SYMBOL_GPL(rcu_scheduler_active);
 
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+
+int debug_lockdep_rcu_enabled(void)
+{
+        return rcu_scheduler_active && debug_locks &&
+               current->lockdep_recursion == 0;
+}
+EXPORT_SYMBOL_GPL(debug_lockdep_rcu_enabled);
+
+/**
+ * rcu_read_lock_bh_held - might we be in RCU-bh read-side critical section?
+ *
+ * Check for bottom half being disabled, which covers both the
+ * CONFIG_PROVE_RCU and not cases.  Note that if someone uses
+ * rcu_read_lock_bh(), but then later enables BH, lockdep (if enabled)
+ * will show the situation.
+ *
+ * Check debug_lockdep_rcu_enabled() to prevent false positives during boot.
+ */
+int rcu_read_lock_bh_held(void)
+{
+        if (!debug_lockdep_rcu_enabled())
+                return 1;
+        return in_softirq();
+}
+EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held);
+
+#endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
+
 /*
  * This function is invoked towards the end of the scheduler's initialization
  * process.  Before this is called, the idle task might contain
diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index 1439eb504c22..4a525a30e08e 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -246,12 +246,21 @@ struct rcu_data {
 
 #define RCU_JIFFIES_TILL_FORCE_QS        3      /* for rsp->jiffies_force_qs */
 #ifdef CONFIG_RCU_CPU_STALL_DETECTOR
-#define RCU_SECONDS_TILL_STALL_CHECK   (10 * HZ)  /* for rsp->jiffies_stall */
-#define RCU_SECONDS_TILL_STALL_RECHECK (30 * HZ)  /* for rsp->jiffies_stall */
-#define RCU_STALL_RAT_DELAY             2         /* Allow other CPUs time */
-                                                  /*  to take at least one */
-                                                  /*  scheduling clock irq */
-                                                  /*  before ratting on them. */
+
+#ifdef CONFIG_PROVE_RCU
+#define RCU_STALL_DELAY_DELTA          (5 * HZ)
+#else
+#define RCU_STALL_DELAY_DELTA          0
+#endif
+
+#define RCU_SECONDS_TILL_STALL_CHECK   (10 * HZ + RCU_STALL_DELAY_DELTA)
+                                                /* for rsp->jiffies_stall */
+#define RCU_SECONDS_TILL_STALL_RECHECK (30 * HZ + RCU_STALL_DELAY_DELTA)
+                                                /* for rsp->jiffies_stall */
+#define RCU_STALL_RAT_DELAY             2       /* Allow other CPUs time */
+                                                /*  to take at least one */
+                                                /*  scheduling clock irq */
+                                                /*  before ratting on them. */
 
 #endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
 
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 464ad2cdee00..79b53bda8943 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -1010,6 +1010,10 @@ int rcu_needs_cpu(int cpu)
         int c = 0;
         int thatcpu;
 
+        /* Check for being in the holdoff period. */
+        if (per_cpu(rcu_dyntick_holdoff, cpu) == jiffies)
+                return rcu_needs_cpu_quick_check(cpu);
+
         /* Don't bother unless we are the last non-dyntick-idle CPU. */
         for_each_cpu_not(thatcpu, nohz_cpu_mask)
                 if (thatcpu != cpu) {
@@ -1041,10 +1045,8 @@ int rcu_needs_cpu(int cpu)
         }
 
         /* If RCU callbacks are still pending, RCU still needs this CPU. */
-        if (c) {
+        if (c)
                 raise_softirq(RCU_SOFTIRQ);
-                per_cpu(rcu_dyntick_holdoff, cpu) = jiffies;
-        }
         return c;
 }
 
diff --git a/kernel/relay.c b/kernel/relay.c
index c705a41b4ba3..3d97f2821611 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -1215,14 +1215,14 @@ static void relay_page_release(struct splice_pipe_desc *spd, unsigned int i)
 /*
  *      subbuf_splice_actor - splice up to one subbuf's worth of data
  */
-static int subbuf_splice_actor(struct file *in,
+static ssize_t subbuf_splice_actor(struct file *in,
                                loff_t *ppos,
                                struct pipe_inode_info *pipe,
                                size_t len,
                                unsigned int flags,
                                int *nonpad_ret)
 {
-        unsigned int pidx, poff, total_len, subbuf_pages, nr_pages, ret;
+        unsigned int pidx, poff, total_len, subbuf_pages, nr_pages;
         struct rchan_buf *rbuf = in->private_data;
         unsigned int subbuf_size = rbuf->chan->subbuf_size;
         uint64_t pos = (uint64_t) *ppos;
@@ -1241,6 +1241,7 @@ static int subbuf_splice_actor(struct file *in,
                 .ops = &relay_pipe_buf_ops,
                 .spd_release = relay_page_release,
         };
+        ssize_t ret;
 
         if (rbuf->subbufs_produced == rbuf->subbufs_consumed)
                 return 0;
diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index bcdabf37c40b..c7eaa37a768b 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -10,7 +10,6 @@
 #include <linux/types.h>
 #include <linux/parser.h>
 #include <linux/fs.h>
-#include <linux/slab.h>
 #include <linux/res_counter.h>
 #include <linux/uaccess.h>
 #include <linux/mm.h>
diff --git a/kernel/resource.c b/kernel/resource.c
index 2d5be5d9bf5f..9c358e263534 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -219,19 +219,34 @@ void release_child_resources(struct resource *r)
 }
 
 /**
- * request_resource - request and reserve an I/O or memory resource
+ * request_resource_conflict - request and reserve an I/O or memory resource
  * @root: root resource descriptor
  * @new: resource descriptor desired by caller
  *
- * Returns 0 for success, negative error code on error.
+ * Returns 0 for success, conflict resource on error.
  */
-int request_resource(struct resource *root, struct resource *new)
+struct resource *request_resource_conflict(struct resource *root, struct resource *new)
 {
         struct resource *conflict;
 
         write_lock(&resource_lock);
         conflict = __request_resource(root, new);
         write_unlock(&resource_lock);
+        return conflict;
+}
+
+/**
+ * request_resource - request and reserve an I/O or memory resource
+ * @root: root resource descriptor
+ * @new: resource descriptor desired by caller
+ *
+ * Returns 0 for success, negative error code on error.
+ */
+int request_resource(struct resource *root, struct resource *new)
+{
+        struct resource *conflict;
+
+        conflict = request_resource_conflict(root, new);
         return conflict ? -EBUSY : 0;
 }
 
@@ -474,25 +489,40 @@ static struct resource * __insert_resource(struct resource *parent, struct resou
 }
 
 /**
- * insert_resource - Inserts a resource in the resource tree
+ * insert_resource_conflict - Inserts resource in the resource tree
  * @parent: parent of the new resource
  * @new: new resource to insert
  *
- * Returns 0 on success, -EBUSY if the resource can't be inserted.
+ * Returns 0 on success, conflict resource if the resource can't be inserted.
  *
- * This function is equivalent to request_resource when no conflict
+ * This function is equivalent to request_resource_conflict when no conflict
  * happens. If a conflict happens, and the conflicting resources
  * entirely fit within the range of the new resource, then the new
  * resource is inserted and the conflicting resources become children of
  * the new resource.
  */
-int insert_resource(struct resource *parent, struct resource *new)
+struct resource *insert_resource_conflict(struct resource *parent, struct resource *new)
 {
         struct resource *conflict;
 
         write_lock(&resource_lock);
         conflict = __insert_resource(parent, new);
         write_unlock(&resource_lock);
+        return conflict;
+}
+
+/**
+ * insert_resource - Inserts a resource in the resource tree
+ * @parent: parent of the new resource
+ * @new: new resource to insert
+ *
+ * Returns 0 on success, -EBUSY if the resource can't be inserted.
+ */
+int insert_resource(struct resource *parent, struct resource *new)
+{
+        struct resource *conflict;
+
+        conflict = insert_resource_conflict(parent, new);
         return conflict ? -EBUSY : 0;
 }
 
diff --git a/kernel/sched.c b/kernel/sched.c
index abb36b16b93b..6af210a7de70 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -71,6 +71,7 @@
 #include <linux/debugfs.h>
 #include <linux/ctype.h>
 #include <linux/ftrace.h>
+#include <linux/slab.h>
 
 #include <asm/tlb.h>
 #include <asm/irq_regs.h>
@@ -2359,7 +2360,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
 {
         int cpu, orig_cpu, this_cpu, success = 0;
         unsigned long flags;
-        struct rq *rq, *orig_rq;
+        struct rq *rq;
 
         if (!sched_feat(SYNC_WAKEUPS))
                 wake_flags &= ~WF_SYNC;
@@ -2367,7 +2368,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
         this_cpu = get_cpu();
 
         smp_wmb();
-        rq = orig_rq = task_rq_lock(p, &flags);
+        rq = task_rq_lock(p, &flags);
         update_rq_clock(rq);
         if (!(p->state & state))
                 goto out;
@@ -2650,7 +2651,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
 {
         unsigned long flags;
         struct rq *rq;
-        int cpu = get_cpu();
+        int cpu __maybe_unused = get_cpu();
 
 #ifdef CONFIG_SMP
         /*
@@ -4353,7 +4354,7 @@ int can_nice(const struct task_struct *p, const int nice)
         /* convert nice value [19,-20] to rlimit style value [1,40] */
         int nice_rlim = 20 - nice;
 
-        return (nice_rlim <= p->signal->rlim[RLIMIT_NICE].rlim_cur ||
+        return (nice_rlim <= task_rlimit(p, RLIMIT_NICE) ||
                 capable(CAP_SYS_NICE));
 }
 
@@ -4530,7 +4531,7 @@ recheck:
 
                         if (!lock_task_sighand(p, &flags))
                                 return -ESRCH;
-                        rlim_rtprio = p->signal->rlim[RLIMIT_RTPRIO].rlim_cur;
+                        rlim_rtprio = task_rlimit(p, RLIMIT_RTPRIO);
                         unlock_task_sighand(p, &flags);
 
                         /* can't set/change the rt policy */
@@ -4902,7 +4903,9 @@ SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len,
         int ret;
         cpumask_var_t mask;
 
-        if (len < cpumask_size())
+        if ((len * BITS_PER_BYTE) < nr_cpu_ids)
+                return -EINVAL;
+        if (len & (sizeof(unsigned long)-1))
                 return -EINVAL;
 
         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
@@ -4910,10 +4913,12 @@ SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len,
 
         ret = sched_getaffinity(pid, mask);
         if (ret == 0) {
-                if (copy_to_user(user_mask_ptr, mask, cpumask_size()))
+                size_t retlen = min_t(size_t, len, cpumask_size());
+
+                if (copy_to_user(user_mask_ptr, mask, retlen))
                         ret = -EFAULT;
                 else
-                        ret = cpumask_size();
+                        ret = retlen;
         }
         free_cpumask_var(mask);
 
@@ -5383,7 +5388,7 @@ int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
 
                 get_task_struct(mt);
                 task_rq_unlock(rq, &flags);
-                wake_up_process(rq->migration_thread);
+                wake_up_process(mt);
                 put_task_struct(mt);
                 wait_for_completion(&req.done);
                 tlb_migrate_finish(p->mm);
@@ -7406,11 +7411,13 @@ static ssize_t sched_power_savings_store(const char *buf, size_t count, int smt)
 
 #ifdef CONFIG_SCHED_MC
 static ssize_t sched_mc_power_savings_show(struct sysdev_class *class,
+                                           struct sysdev_class_attribute *attr,
                                            char *page)
 {
         return sprintf(page, "%u\n", sched_mc_power_savings);
 }
 static ssize_t sched_mc_power_savings_store(struct sysdev_class *class,
+                                            struct sysdev_class_attribute *attr,
                                             const char *buf, size_t count)
 {
         return sched_power_savings_store(buf, count, 0);
@@ -7422,11 +7429,13 @@ static SYSDEV_CLASS_ATTR(sched_mc_power_savings, 0644,
 
 #ifdef CONFIG_SCHED_SMT
 static ssize_t sched_smt_power_savings_show(struct sysdev_class *dev,
+                                            struct sysdev_class_attribute *attr,
                                             char *page)
 {
         return sprintf(page, "%u\n", sched_smt_power_savings);
 }
 static ssize_t sched_smt_power_savings_store(struct sysdev_class *dev,
+                                             struct sysdev_class_attribute *attr,
                                              const char *buf, size_t count)
 {
         return sched_power_savings_store(buf, count, 1);
diff --git a/kernel/sched_cpupri.c b/kernel/sched_cpupri.c
index eeb3506c4834..e6871cb3fc83 100644
--- a/kernel/sched_cpupri.c
+++ b/kernel/sched_cpupri.c
@@ -27,6 +27,7 @@
  *  of the License.
  */
 
+#include <linux/gfp.h>
 #include "sched_cpupri.h"
 
 /* Convert between a 140 based task->prio, and our 102 based cpupri */
@@ -47,7 +48,7 @@ static int convert_prio(int prio)
 }
 
 #define for_each_cpupri_active(array, idx)                    \
-        for_each_bit(idx, array, CPUPRI_NR_PRIORITIES)
+        for_each_set_bit(idx, array, CPUPRI_NR_PRIORITIES)
 
 /**
  * cpupri_find - find the best (lowest-pri) CPU in the system
@@ -56,7 +57,7 @@ static int convert_prio(int prio)
  * @lowest_mask: A mask to fill in with selected CPUs (or NULL)
  *
  * Note: This function returns the recommended CPUs as calculated during the
- * current invokation.  By the time the call returns, the CPUs may have in
+ * current invocation.  By the time the call returns, the CPUs may have in
  * fact changed priorities any number of times.  While not ideal, it is not
  * an issue of correctness since the normal rebalancer logic will correct
  * any discrepancies created by racing against the uncertainty of the current
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 67f95aada4b9..9b49db144037 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -518,8 +518,4 @@ void proc_sched_set_task(struct task_struct *p)
         p->se.nr_wakeups_idle                   = 0;
         p->sched_info.bkl_count                 = 0;
 #endif
-        p->se.sum_exec_runtime                  = 0;
-        p->se.prev_sum_exec_runtime             = 0;
-        p->nvcsw                                = 0;
-        p->nivcsw                               = 0;
 }
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 3e1fd96c6cf9..5a5ea2cd924f 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -3476,7 +3476,7 @@ static void run_rebalance_domains(struct softirq_action *h)
 
 static inline int on_null_domain(int cpu)
 {
-        return !rcu_dereference(cpu_rq(cpu)->sd);
+        return !rcu_dereference_sched(cpu_rq(cpu)->sd);
 }
 
 /*
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index bf3e38fdbe6d..b5b920ae2ea7 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1146,7 +1146,12 @@ static struct task_struct *pick_next_highest_task_rt(struct rq *rq, int cpu)
                 if (next && next->prio < idx)
                         continue;
                 list_for_each_entry(rt_se, array->queue + idx, run_list) {
-                        struct task_struct *p = rt_task_of(rt_se);
+                        struct task_struct *p;
+
+                        if (!rt_entity_is_task(rt_se))
+                                continue;
+
+                        p = rt_task_of(rt_se);
                         if (pick_rt_task(rq, p, cpu)) {
                                 next = p;
                                 break;
@@ -1662,8 +1667,9 @@ static void watchdog(struct rq *rq, struct task_struct *p)
         if (!p->signal)
                 return;
 
-        soft = p->signal->rlim[RLIMIT_RTTIME].rlim_cur;
-        hard = p->signal->rlim[RLIMIT_RTTIME].rlim_max;
+        /* max may change after cur was read, this will be fixed next tick */
+        soft = task_rlimit(p, RLIMIT_RTTIME);
+        hard = task_rlimit_max(p, RLIMIT_RTTIME);
 
         if (soft != RLIM_INFINITY) {
                 unsigned long next;
diff --git a/kernel/signal.c b/kernel/signal.c
index 5bb9baffa4f1..dbd7fe073c55 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -245,7 +245,7 @@ __sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimi
 
         if (override_rlimit ||
             atomic_read(&user->sigpending) <=
-                        t->signal->rlim[RLIMIT_SIGPENDING].rlim_cur) {
+                        task_rlimit(t, RLIMIT_SIGPENDING)) {
                 q = kmem_cache_alloc(sigqueue_cachep, flags);
         } else {
                 print_dropped_signal(sig);
diff --git a/kernel/slow-work.c b/kernel/slow-work.c
index 7494bbf5a270..7d3f4fa9ef4f 100644
--- a/kernel/slow-work.c
+++ b/kernel/slow-work.c
@@ -637,7 +637,7 @@ int delayed_slow_work_enqueue(struct delayed_slow_work *dwork,
                         goto cancelled;
 
                 /* the timer holds a reference whilst it is pending */
-                ret = work->ops->get_ref(work);
+                ret = slow_work_get_ref(work);
                 if (ret < 0)
                         goto cant_get_ref;
 
diff --git a/kernel/slow-work.h b/kernel/slow-work.h
index 321f3c59d732..a29ebd1ef41d 100644
--- a/kernel/slow-work.h
+++ b/kernel/slow-work.h
@@ -43,28 +43,28 @@ extern void slow_work_new_thread_desc(struct slow_work *, struct seq_file *);
  */
 static inline void slow_work_set_thread_pid(int id, pid_t pid)
 {
-#ifdef CONFIG_SLOW_WORK_PROC
+#ifdef CONFIG_SLOW_WORK_DEBUG
         slow_work_pids[id] = pid;
 #endif
 }
 
 static inline void slow_work_mark_time(struct slow_work *work)
 {
-#ifdef CONFIG_SLOW_WORK_PROC
+#ifdef CONFIG_SLOW_WORK_DEBUG
         work->mark = CURRENT_TIME;
 #endif
 }
 
 static inline void slow_work_begin_exec(int id, struct slow_work *work)
 {
-#ifdef CONFIG_SLOW_WORK_PROC
+#ifdef CONFIG_SLOW_WORK_DEBUG
         slow_work_execs[id] = work;
 #endif
 }
 
 static inline void slow_work_end_exec(int id, struct slow_work *work)
 {
-#ifdef CONFIG_SLOW_WORK_PROC
+#ifdef CONFIG_SLOW_WORK_DEBUG
         write_lock(&slow_work_execs_lock);
         slow_work_execs[id] = NULL;
         write_unlock(&slow_work_execs_lock);
diff --git a/kernel/smp.c b/kernel/smp.c
index 9867b6bfefce..3fc697336183 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -9,6 +9,7 @@
 #include <linux/module.h>
 #include <linux/percpu.h>
 #include <linux/init.h>
+#include <linux/gfp.h>
 #include <linux/smp.h>
 #include <linux/cpu.h>
 
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 0d4c7898ab80..4b493f67dcb5 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -155,11 +155,11 @@ void softlockup_tick(void)
          * Wake up the high-prio watchdog task twice per
          * threshold timespan.
          */
-        if (now > touch_ts + softlockup_thresh/2)
+        if (time_after(now - softlockup_thresh/2, touch_ts))
                 wake_up_process(per_cpu(softlockup_watchdog, this_cpu));
 
         /* Warn about unreasonable delays: */
-        if (now <= (touch_ts + softlockup_thresh))
+        if (time_before_eq(now - softlockup_thresh, touch_ts))
                 return;
 
         per_cpu(softlockup_print_ts, this_cpu) = touch_ts;
diff --git a/kernel/srcu.c b/kernel/srcu.c
index bde4295774c8..2980da3fd509 100644
--- a/kernel/srcu.c
+++ b/kernel/srcu.c
@@ -30,7 +30,6 @@
 #include <linux/preempt.h>
 #include <linux/rcupdate.h>
 #include <linux/sched.h>
-#include <linux/slab.h>
 #include <linux/smp.h>
 #include <linux/srcu.h>
 
diff --git a/kernel/sys.c b/kernel/sys.c
index 877fe4f8e05e..7cb426a58965 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -33,8 +33,10 @@
 #include <linux/task_io_accounting_ops.h>
 #include <linux/seccomp.h>
 #include <linux/cpu.h>
+#include <linux/personality.h>
 #include <linux/ptrace.h>
 #include <linux/fs_struct.h>
+#include <linux/gfp.h>
 
 #include <linux/compat.h>
 #include <linux/syscalls.h>
@@ -571,8 +573,7 @@ static int set_user(struct cred *new)
         if (!new_user)
                 return -EAGAIN;
 
-        if (atomic_read(&new_user->processes) >=
-                                current->signal->rlim[RLIMIT_NPROC].rlim_cur &&
+        if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) &&
                         new_user != INIT_USER) {
                 free_uid(new_user);
                 return -EAGAIN;
@@ -1115,6 +1116,15 @@ out:
 
 DECLARE_RWSEM(uts_sem);
 
+#ifdef COMPAT_UTS_MACHINE
+#define override_architecture(name) \
+        (personality(current->personality) == PER_LINUX32 && \
+         copy_to_user(name->machine, COMPAT_UTS_MACHINE, \
+                      sizeof(COMPAT_UTS_MACHINE)))
+#else
+#define override_architecture(name)     0
+#endif
+
 SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name)
 {
         int errno = 0;
@@ -1123,9 +1133,66 @@ SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name)
         if (copy_to_user(name, utsname(), sizeof *name))
                 errno = -EFAULT;
         up_read(&uts_sem);
+
+        if (!errno && override_architecture(name))
+                errno = -EFAULT;
         return errno;
 }
 
+#ifdef __ARCH_WANT_SYS_OLD_UNAME
+/*
+ * Old cruft
+ */
+SYSCALL_DEFINE1(uname, struct old_utsname __user *, name)
+{
+        int error = 0;
+
+        if (!name)
+                return -EFAULT;
+
+        down_read(&uts_sem);
+        if (copy_to_user(name, utsname(), sizeof(*name)))
+                error = -EFAULT;
+        up_read(&uts_sem);
+
+        if (!error && override_architecture(name))
+                error = -EFAULT;
+        return error;
+}
+
+SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name)
+{
+        int error;
+
+        if (!name)
+                return -EFAULT;
+        if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
+                return -EFAULT;
+
+        down_read(&uts_sem);
+        error = __copy_to_user(&name->sysname, &utsname()->sysname,
+                               __OLD_UTS_LEN);
+        error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
+        error |= __copy_to_user(&name->nodename, &utsname()->nodename,
+                                __OLD_UTS_LEN);
+        error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
+        error |= __copy_to_user(&name->release, &utsname()->release,
+                                __OLD_UTS_LEN);
+        error |= __put_user(0, name->release + __OLD_UTS_LEN);
+        error |= __copy_to_user(&name->version, &utsname()->version,
+                                __OLD_UTS_LEN);
+        error |= __put_user(0, name->version + __OLD_UTS_LEN);
+        error |= __copy_to_user(&name->machine, &utsname()->machine,
+                                __OLD_UTS_LEN);
+        error |= __put_user(0, name->machine + __OLD_UTS_LEN);
+        up_read(&uts_sem);
+
+        if (!error && override_architecture(name))
+                error = -EFAULT;
+        return error ? -EFAULT : 0;
+}
+#endif
+
 SYSCALL_DEFINE2(sethostname, char __user *, name, int, len)
 {
         int errno;
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 695384f12a7d..70f2ea758ffe 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -126,6 +126,7 @@ cond_syscall(sys_setreuid16);
 cond_syscall(sys_setuid16);
 cond_syscall(sys_vm86old);
 cond_syscall(sys_vm86);
+cond_syscall(sys_ipc);
 cond_syscall(compat_sys_ipc);
 cond_syscall(compat_sys_sysctl);
 cond_syscall(sys_flock);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 33e7a38b6eb9..8686b0f5fc12 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -23,6 +23,7 @@
 #include <linux/swap.h>
 #include <linux/slab.h>
 #include <linux/sysctl.h>
+#include <linux/signal.h>
 #include <linux/proc_fs.h>
 #include <linux/security.h>
 #include <linux/ctype.h>
@@ -50,6 +51,7 @@
 #include <linux/ftrace.h>
 #include <linux/slow-work.h>
 #include <linux/perf_event.h>
+#include <linux/kprobes.h>
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
@@ -59,13 +61,23 @@
 #include <asm/stacktrace.h>
 #include <asm/io.h>
 #endif
+#ifdef CONFIG_BSD_PROCESS_ACCT
+#include <linux/acct.h>
+#endif
+#ifdef CONFIG_RT_MUTEXES
+#include <linux/rtmutex.h>
+#endif
+#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
+#include <linux/lockdep.h>
+#endif
+#ifdef CONFIG_CHR_DEV_SG
+#include <scsi/sg.h>
+#endif
 
 
 #if defined(CONFIG_SYSCTL)
 
 /* External variables not in a header file. */
-extern int C_A_D;
-extern int print_fatal_signals;
 extern int sysctl_overcommit_memory;
 extern int sysctl_overcommit_ratio;
 extern int sysctl_panic_on_oom;
@@ -87,9 +99,6 @@ extern int sysctl_nr_open_min, sysctl_nr_open_max;
 #ifndef CONFIG_MMU
 extern int sysctl_nr_trim_pages;
 #endif
-#ifdef CONFIG_RCU_TORTURE_TEST
-extern int rcutorture_runnable;
-#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
 #ifdef CONFIG_BLOCK
 extern int blk_iopoll_enabled;
 #endif
@@ -119,14 +128,6 @@ static int min_percpu_pagelist_fract = 8;
 
 static int ngroups_max = NGROUPS_MAX;
 
-#ifdef CONFIG_MODULES
-extern char modprobe_path[];
-extern int modules_disabled;
-#endif
-#ifdef CONFIG_CHR_DEV_SG
-extern int sg_big_buff;
-#endif
-
 #ifdef CONFIG_SPARC
 #include <asm/system.h>
 #endif
@@ -148,10 +149,6 @@ extern int sysctl_userprocess_debug;
 extern int spin_retry;
 #endif
 
-#ifdef CONFIG_BSD_PROCESS_ACCT
-extern int acct_parm[];
-#endif
-
 #ifdef CONFIG_IA64
 extern int no_unaligned_warning;
 extern int unaligned_dump_stack;
@@ -159,10 +156,6 @@ extern int unaligned_dump_stack;
 
 extern struct ratelimit_state printk_ratelimit_state;
 
-#ifdef CONFIG_RT_MUTEXES
-extern int max_lock_depth;
-#endif
-
 #ifdef CONFIG_PROC_SYSCTL
 static int proc_do_cad_pid(struct ctl_table *table, int write,
                   void __user *buffer, size_t *lenp, loff_t *ppos);
@@ -201,9 +194,6 @@ extern struct ctl_table epoll_table[];
 int sysctl_legacy_va_layout;
 #endif
 
-extern int prove_locking;
-extern int lock_stat;
-
 /* The default sysctl tables: */
 
 static struct ctl_table root_table[] = {
@@ -1450,6 +1440,17 @@ static struct ctl_table debug_table[] = {
                 .proc_handler   = proc_dointvec
         },
 #endif
+#if defined(CONFIG_OPTPROBES)
+        {
+                .procname       = "kprobes-optimization",
+                .data           = &sysctl_kprobes_optimization,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = proc_kprobes_optimization_handler,
+                .extra1         = &zero,
+                .extra2         = &one,
+        },
+#endif
         { }
 };
 
diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index 8cd50d8f9bde..59030570f5ca 100644
--- a/kernel/sysctl_binary.c
+++ b/kernel/sysctl_binary.c
@@ -13,6 +13,7 @@
 #include <linux/file.h>
 #include <linux/ctype.h>
 #include <linux/netdevice.h>
+#include <linux/slab.h>
 
 #ifdef CONFIG_SYSCTL_SYSCALL
 
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 899ca51be5e8..11281d5792bd 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -22,6 +22,7 @@
 #include <linux/delayacct.h>
 #include <linux/cpumask.h>
 #include <linux/percpu.h>
+#include <linux/slab.h>
 #include <linux/cgroupstats.h>
 #include <linux/cgroup.h>
 #include <linux/fs.h>
diff --git a/kernel/time.c b/kernel/time.c
index 804798005d19..656dccfe1cbb 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -35,7 +35,6 @@
 #include <linux/syscalls.h>
 #include <linux/security.h>
 #include <linux/fs.h>
-#include <linux/slab.h>
 #include <linux/math64.h>
 #include <linux/ptrace.h>
 
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 1f663d23e85e..1f5dde637457 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -592,6 +592,10 @@ static inline void clocksource_select(void) { }
  */
 static int __init clocksource_done_booting(void)
 {
+        mutex_lock(&clocksource_mutex);
+        curr_clocksource = clocksource_default_clock();
+        mutex_unlock(&clocksource_mutex);
+
         finished_booting = 1;
 
         /*
diff --git a/kernel/time/tick-oneshot.c b/kernel/time/tick-oneshot.c
index 0a8a213016f0..aada0e52680a 100644
--- a/kernel/time/tick-oneshot.c
+++ b/kernel/time/tick-oneshot.c
@@ -22,6 +22,29 @@
 
 #include "tick-internal.h"
 
+/* Limit min_delta to a jiffie */
+#define MIN_DELTA_LIMIT         (NSEC_PER_SEC / HZ)
+
+static int tick_increase_min_delta(struct clock_event_device *dev)
+{
+        /* Nothing to do if we already reached the limit */
+        if (dev->min_delta_ns >= MIN_DELTA_LIMIT)
+                return -ETIME;
+
+        if (dev->min_delta_ns < 5000)
+                dev->min_delta_ns = 5000;
+        else
+                dev->min_delta_ns += dev->min_delta_ns >> 1;
+
+        if (dev->min_delta_ns > MIN_DELTA_LIMIT)
+                dev->min_delta_ns = MIN_DELTA_LIMIT;
+
+        printk(KERN_WARNING "CE: %s increased min_delta_ns to %llu nsec\n",
+               dev->name ? dev->name : "?",
+               (unsigned long long) dev->min_delta_ns);
+        return 0;
+}
+
 /**
  * tick_program_event internal worker function
  */
@@ -37,23 +60,28 @@ int tick_dev_program_event(struct clock_event_device *dev, ktime_t expires,
                 if (!ret || !force)
                         return ret;
 
+                dev->retries++;
                 /*
-                 * We tried 2 times to program the device with the given
-                 * min_delta_ns. If that's not working then we double it
+                 * We tried 3 times to program the device with the given
+                 * min_delta_ns. If that's not working then we increase it
                  * and emit a warning.
                  */
                 if (++i > 2) {
                         /* Increase the min. delta and try again */
-                        if (!dev->min_delta_ns)
-                                dev->min_delta_ns = 5000;
-                        else
-                                dev->min_delta_ns += dev->min_delta_ns >> 1;
-
-                        printk(KERN_WARNING
-                               "CE: %s increasing min_delta_ns to %llu nsec\n",
-                               dev->name ? dev->name : "?",
-                               (unsigned long long) dev->min_delta_ns << 1);
-
+                        if (tick_increase_min_delta(dev)) {
+                                /*
+                                 * Get out of the loop if min_delta_ns
+                                 * hit the limit already. That's
+                                 * better than staying here forever.
+                                 *
+                                 * We clear next_event so we have a
+                                 * chance that the box survives.
+                                 */
+                                printk(KERN_WARNING
+                                       "CE: Reprogramming failure. Giving up\n");
+                                dev->next_event.tv64 = KTIME_MAX;
+                                return -ETIME;
+                        }
                         i = 0;
                 }
 
diff --git a/kernel/time/timecompare.c b/kernel/time/timecompare.c
index 12f5c55090be..ac38fbb176cc 100644
--- a/kernel/time/timecompare.c
+++ b/kernel/time/timecompare.c
@@ -19,6 +19,7 @@
 
 #include <linux/timecompare.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/math64.h>
 
 /*
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 16736379a9ca..39f6177fafac 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -818,7 +818,8 @@ void update_wall_time(void)
         shift = min(shift, maxshift);
         while (offset >= timekeeper.cycle_interval) {
                 offset = logarithmic_accumulation(offset, shift);
-                shift--;
+                if(offset < timekeeper.cycle_interval<<shift)
+                        shift--;
         }
 
         /* correct the clock when NTP error is too big */
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index bdfb8dd1050c..1a4a7dd78777 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -228,6 +228,7 @@ print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
         SEQ_printf(m, " event_handler:  ");
         print_name_offset(m, dev->event_handler);
         SEQ_printf(m, "\n");
+        SEQ_printf(m, " retries:        %lu\n", dev->retries);
 }
 
 static void timer_list_show_tickdevices(struct seq_file *m)
@@ -257,7 +258,7 @@ static int timer_list_show(struct seq_file *m, void *v)
         u64 now = ktime_to_ns(ktime_get());
         int cpu;
 
-        SEQ_printf(m, "Timer List Version: v0.5\n");
+        SEQ_printf(m, "Timer List Version: v0.6\n");
         SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
         SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
 
diff --git a/kernel/timer.c b/kernel/timer.c
index c61a7949387f..aeb6a54f2771 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -39,6 +39,7 @@
 #include <linux/kallsyms.h>
 #include <linux/perf_event.h>
 #include <linux/sched.h>
+#include <linux/slab.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -880,6 +881,7 @@ int try_to_del_timer_sync(struct timer_list *timer)
         if (base->running_timer == timer)
                 goto out;
 
+        timer_stats_timer_clear_start_info(timer);
         ret = 0;
         if (timer_pending(timer)) {
                 detach_timer(timer, 1);
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index d00c6fe23f54..78edc6490038 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -52,7 +52,7 @@ obj-$(CONFIG_EVENT_TRACING) += trace_events.o
 obj-$(CONFIG_EVENT_TRACING) += trace_export.o
 obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o
 ifeq ($(CONFIG_PERF_EVENTS),y)
-obj-$(CONFIG_EVENT_TRACING) += trace_event_profile.o
+obj-$(CONFIG_EVENT_TRACING) += trace_event_perf.o
 endif
 obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
 obj-$(CONFIG_KPROBE_EVENT) += trace_kprobe.o
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 07f945a99430..b3bc91a3f510 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -21,6 +21,7 @@
 #include <linux/percpu.h>
 #include <linux/init.h>
 #include <linux/mutex.h>
+#include <linux/slab.h>
 #include <linux/debugfs.h>
 #include <linux/smp_lock.h>
 #include <linux/time.h>
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 83783579378f..2404b59b3097 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -24,9 +24,11 @@
 #include <linux/uaccess.h>
 #include <linux/ftrace.h>
 #include <linux/sysctl.h>
+#include <linux/slab.h>
 #include <linux/ctype.h>
 #include <linux/list.h>
 #include <linux/hash.h>
+#include <linux/rcupdate.h>
 
 #include <trace/events/sched.h>
 
@@ -84,22 +86,22 @@ ftrace_func_t ftrace_trace_function __read_mostly = ftrace_stub;
 ftrace_func_t __ftrace_trace_function __read_mostly = ftrace_stub;
 ftrace_func_t ftrace_pid_function __read_mostly = ftrace_stub;
 
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-static int ftrace_set_func(unsigned long *array, int *idx, char *buffer);
-#endif
-
+/*
+ * Traverse the ftrace_list, invoking all entries.  The reason that we
+ * can use rcu_dereference_raw() is that elements removed from this list
+ * are simply leaked, so there is no need to interact with a grace-period
+ * mechanism.  The rcu_dereference_raw() calls are needed to handle
+ * concurrent insertions into the ftrace_list.
+ *
+ * Silly Alpha and silly pointer-speculation compiler optimizations!
+ */
 static void ftrace_list_func(unsigned long ip, unsigned long parent_ip)
 {
-        struct ftrace_ops *op = ftrace_list;
-
-        /* in case someone actually ports this to alpha! */
-        read_barrier_depends();
+        struct ftrace_ops *op = rcu_dereference_raw(ftrace_list); /*see above*/
 
         while (op != &ftrace_list_end) {
-                /* silly alpha */
-                read_barrier_depends();
                 op->func(ip, parent_ip);
-                op = op->next;
+                op = rcu_dereference_raw(op->next); /*see above*/
         };
 }
 
@@ -154,8 +156,7 @@ static int __register_ftrace_function(struct ftrace_ops *ops)
          * the ops->next pointer is valid before another CPU sees
          * the ops pointer included into the ftrace_list.
          */
-        smp_wmb();
-        ftrace_list = ops;
+        rcu_assign_pointer(ftrace_list, ops);
 
         if (ftrace_enabled) {
                 ftrace_func_t func;
@@ -2276,6 +2277,8 @@ __setup("ftrace_filter=", set_ftrace_filter);
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 static char ftrace_graph_buf[FTRACE_FILTER_SIZE] __initdata;
+static int ftrace_set_func(unsigned long *array, int *idx, char *buffer);
+
 static int __init set_graph_function(char *str)
 {
         strlcpy(ftrace_graph_buf, str, FTRACE_FILTER_SIZE);
@@ -3351,6 +3354,7 @@ void ftrace_graph_init_task(struct task_struct *t)
 {
         /* Make sure we do not use the parent ret_stack */
         t->ret_stack = NULL;
+        t->curr_ret_stack = -1;
 
         if (ftrace_graph_active) {
                 struct ftrace_ret_stack *ret_stack;
@@ -3360,7 +3364,6 @@ void ftrace_graph_init_task(struct task_struct *t)
                                 GFP_KERNEL);
                 if (!ret_stack)
                         return;
-                t->curr_ret_stack = -1;
                 atomic_set(&t->tracing_graph_pause, 0);
                 atomic_set(&t->trace_overrun, 0);
                 t->ftrace_timestamp = 0;
diff --git a/kernel/trace/power-traces.c b/kernel/trace/power-traces.c
index 9f4f565b01e6..a22582a06161 100644
--- a/kernel/trace/power-traces.c
+++ b/kernel/trace/power-traces.c
@@ -9,7 +9,6 @@
 #include <linux/workqueue.h>
 #include <linux/sched.h>
 #include <linux/module.h>
-#include <linux/slab.h>
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/power.h>
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 0287f9f52f5a..41ca394feb22 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -14,6 +14,7 @@
 #include <linux/module.h>
 #include <linux/percpu.h>
 #include <linux/mutex.h>
+#include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/hash.h>
 #include <linux/list.h>
@@ -207,6 +208,14 @@ EXPORT_SYMBOL_GPL(tracing_is_on);
 #define RB_MAX_SMALL_DATA       (RB_ALIGNMENT * RINGBUF_TYPE_DATA_TYPE_LEN_MAX)
 #define RB_EVNT_MIN_SIZE        8U      /* two 32bit words */
 
+#if !defined(CONFIG_64BIT) || defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
+# define RB_FORCE_8BYTE_ALIGNMENT       0
+# define RB_ARCH_ALIGNMENT              RB_ALIGNMENT
+#else
+# define RB_FORCE_8BYTE_ALIGNMENT       1
+# define RB_ARCH_ALIGNMENT              8U
+#endif
+
 /* define RINGBUF_TYPE_DATA for 'case RINGBUF_TYPE_DATA:' */
 #define RINGBUF_TYPE_DATA 0 ... RINGBUF_TYPE_DATA_TYPE_LEN_MAX
 
@@ -1201,18 +1210,19 @@ rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned nr_pages)
 
         for (i = 0; i < nr_pages; i++) {
                 if (RB_WARN_ON(cpu_buffer, list_empty(cpu_buffer->pages)))
-                        return;
+                        goto out;
                 p = cpu_buffer->pages->next;
                 bpage = list_entry(p, struct buffer_page, list);
                 list_del_init(&bpage->list);
                 free_buffer_page(bpage);
         }
         if (RB_WARN_ON(cpu_buffer, list_empty(cpu_buffer->pages)))
-                return;
+                goto out;
 
         rb_reset_cpu(cpu_buffer);
         rb_check_pages(cpu_buffer);
 
+out:
         spin_unlock_irq(&cpu_buffer->reader_lock);
 }
 
@@ -1229,7 +1239,7 @@ rb_insert_pages(struct ring_buffer_per_cpu *cpu_buffer,
 
         for (i = 0; i < nr_pages; i++) {
                 if (RB_WARN_ON(cpu_buffer, list_empty(pages)))
-                        return;
+                        goto out;
                 p = pages->next;
                 bpage = list_entry(p, struct buffer_page, list);
                 list_del_init(&bpage->list);
@@ -1238,6 +1248,7 @@ rb_insert_pages(struct ring_buffer_per_cpu *cpu_buffer,
         rb_reset_cpu(cpu_buffer);
         rb_check_pages(cpu_buffer);
 
+out:
         spin_unlock_irq(&cpu_buffer->reader_lock);
 }
 
@@ -1547,7 +1558,7 @@ rb_update_event(struct ring_buffer_event *event,
 
         case 0:
                 length -= RB_EVNT_HDR_SIZE;
-                if (length > RB_MAX_SMALL_DATA)
+                if (length > RB_MAX_SMALL_DATA || RB_FORCE_8BYTE_ALIGNMENT)
                         event->array[0] = length;
                 else
                         event->type_len = DIV_ROUND_UP(length, RB_ALIGNMENT);
@@ -1722,11 +1733,11 @@ static unsigned rb_calculate_event_length(unsigned length)
         if (!length)
                 length = 1;
 
-        if (length > RB_MAX_SMALL_DATA)
+        if (length > RB_MAX_SMALL_DATA || RB_FORCE_8BYTE_ALIGNMENT)
                 length += sizeof(event.array[0]);
 
         length += RB_EVNT_HDR_SIZE;
-        length = ALIGN(length, RB_ALIGNMENT);
+        length = ALIGN(length, RB_ARCH_ALIGNMENT);
 
         return length;
 }
@@ -2233,12 +2244,12 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
         if (ring_buffer_flags != RB_BUFFERS_ON)
                 return NULL;
 
-        if (atomic_read(&buffer->record_disabled))
-                return NULL;
-
         /* If we are tracing schedule, we don't want to recurse */
         resched = ftrace_preempt_disable();
 
+        if (atomic_read(&buffer->record_disabled))
+                goto out_nocheck;
+
         if (trace_recursive_lock())
                 goto out_nocheck;
 
@@ -2470,11 +2481,11 @@ int ring_buffer_write(struct ring_buffer *buffer,
         if (ring_buffer_flags != RB_BUFFERS_ON)
                 return -EBUSY;
 
-        if (atomic_read(&buffer->record_disabled))
-                return -EBUSY;
-
         resched = ftrace_preempt_disable();
 
+        if (atomic_read(&buffer->record_disabled))
+                goto out;
+
         cpu = raw_smp_processor_id();
 
         if (!cpumask_test_cpu(cpu, buffer->cpumask))
@@ -2542,7 +2553,7 @@ EXPORT_SYMBOL_GPL(ring_buffer_record_disable);
  * @buffer: The ring buffer to enable writes
  *
  * Note, multiple disables will need the same number of enables
- * to truely enable the writing (much like preempt_disable).
+ * to truly enable the writing (much like preempt_disable).
  */
 void ring_buffer_record_enable(struct ring_buffer *buffer)
 {
@@ -2578,7 +2589,7 @@ EXPORT_SYMBOL_GPL(ring_buffer_record_disable_cpu);
  * @cpu: The CPU to enable.
  *
  * Note, multiple disables will need the same number of enables
- * to truely enable the writing (much like preempt_disable).
+ * to truly enable the writing (much like preempt_disable).
  */
 void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu)
 {
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ed01fdba4a55..44f916a04065 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -33,10 +33,10 @@
 #include <linux/kdebug.h>
 #include <linux/string.h>
 #include <linux/rwsem.h>
+#include <linux/slab.h>
 #include <linux/ctype.h>
 #include <linux/init.h>
 #include <linux/poll.h>
-#include <linux/gfp.h>
 #include <linux/fs.h>
 
 #include "trace.h"
@@ -374,6 +374,21 @@ static int __init set_buf_size(char *str)
 }
 __setup("trace_buf_size=", set_buf_size);
 
+static int __init set_tracing_thresh(char *str)
+{
+        unsigned long threshhold;
+        int ret;
+
+        if (!str)
+                return 0;
+        ret = strict_strtoul(str, 0, &threshhold);
+        if (ret < 0)
+                return 0;
+        tracing_thresh = threshhold * 1000;
+        return 1;
+}
+__setup("tracing_thresh=", set_tracing_thresh);
+
 unsigned long nsecs_to_usecs(unsigned long nsecs)
 {
         return nsecs / 1000;
@@ -579,9 +594,10 @@ static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt)
 static arch_spinlock_t ftrace_max_lock =
         (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
 
+unsigned long __read_mostly     tracing_thresh;
+
 #ifdef CONFIG_TRACER_MAX_TRACE
 unsigned long __read_mostly     tracing_max_latency;
-unsigned long __read_mostly     tracing_thresh;
 
 /*
  * Copy the new maximum trace into the separate maximum-trace
@@ -592,7 +608,7 @@ static void
 __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
 {
         struct trace_array_cpu *data = tr->data[cpu];
-        struct trace_array_cpu *max_data = tr->data[cpu];
+        struct trace_array_cpu *max_data;
 
         max_tr.cpu = cpu;
         max_tr.time_start = data->preempt_timestamp;
@@ -602,7 +618,7 @@ __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
         max_data->critical_start = data->critical_start;
         max_data->critical_end = data->critical_end;
 
-        memcpy(data->comm, tsk->comm, TASK_COMM_LEN);
+        memcpy(max_data->comm, tsk->comm, TASK_COMM_LEN);
         max_data->pid = tsk->pid;
         max_data->uid = task_uid(tsk);
         max_data->nice = tsk->static_prio - 20 - MAX_RT_PRIO;
@@ -824,10 +840,10 @@ out:
         mutex_unlock(&trace_types_lock);
 }
 
-static void __tracing_reset(struct trace_array *tr, int cpu)
+static void __tracing_reset(struct ring_buffer *buffer, int cpu)
 {
         ftrace_disable_cpu();
-        ring_buffer_reset_cpu(tr->buffer, cpu);
+        ring_buffer_reset_cpu(buffer, cpu);
         ftrace_enable_cpu();
 }
 
@@ -839,7 +855,7 @@ void tracing_reset(struct trace_array *tr, int cpu)
 
         /* Make sure all commits have finished */
         synchronize_sched();
-        __tracing_reset(tr, cpu);
+        __tracing_reset(buffer, cpu);
 
         ring_buffer_record_enable(buffer);
 }
@@ -857,7 +873,7 @@ void tracing_reset_online_cpus(struct trace_array *tr)
         tr->time_start = ftrace_now(tr->cpu);
 
         for_each_online_cpu(cpu)
-                __tracing_reset(tr, cpu);
+                __tracing_reset(buffer, cpu);
 
         ring_buffer_record_enable(buffer);
 }
@@ -934,6 +950,8 @@ void tracing_start(void)
                 goto out;
         }
 
+        /* Prevent the buffers from switching */
+        arch_spin_lock(&ftrace_max_lock);
 
         buffer = global_trace.buffer;
         if (buffer)
@@ -943,6 +961,8 @@ void tracing_start(void)
         if (buffer)
                 ring_buffer_record_enable(buffer);
 
+        arch_spin_unlock(&ftrace_max_lock);
+
         ftrace_start();
  out:
         spin_unlock_irqrestore(&tracing_start_lock, flags);
@@ -964,6 +984,9 @@ void tracing_stop(void)
         if (trace_stop_count++)
                 goto out;
 
+        /* Prevent the buffers from switching */
+        arch_spin_lock(&ftrace_max_lock);
+
         buffer = global_trace.buffer;
         if (buffer)
                 ring_buffer_record_disable(buffer);
@@ -972,6 +995,8 @@ void tracing_stop(void)
         if (buffer)
                 ring_buffer_record_disable(buffer);
 
+        arch_spin_unlock(&ftrace_max_lock);
+
  out:
         spin_unlock_irqrestore(&tracing_start_lock, flags);
 }
@@ -1259,6 +1284,13 @@ ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc)
         if (!(trace_flags & TRACE_ITER_USERSTACKTRACE))
                 return;
 
+        /*
+         * NMIs can not handle page faults, even with fix ups.
+         * The save user stack can (and often does) fault.
+         */
+        if (unlikely(in_nmi()))
+                return;
+
         event = trace_buffer_lock_reserve(buffer, TRACE_USER_STACK,
                                           sizeof(*entry), flags, pc);
         if (!event)
@@ -1703,6 +1735,7 @@ static void *s_start(struct seq_file *m, loff_t *pos)
 
                 ftrace_enable_cpu();
 
+                iter->leftover = 0;
                 for (p = iter; p && l < *pos; p = s_next(m, p, &l))
                         ;
 
@@ -4248,10 +4281,10 @@ static __init int tracer_init_debugfs(void)
 #ifdef CONFIG_TRACER_MAX_TRACE
         trace_create_file("tracing_max_latency", 0644, d_tracer,
                         &tracing_max_latency, &tracing_max_lat_fops);
+#endif
 
         trace_create_file("tracing_thresh", 0644, d_tracer,
                         &tracing_thresh, &tracing_max_lat_fops);
-#endif
 
         trace_create_file("README", 0444, d_tracer,
                         NULL, &tracing_readme_fops);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index fd05bcaf91b0..2825ef2c0b15 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -396,9 +396,10 @@ extern int process_new_ksym_entry(char *ksymname, int op, unsigned long addr);
 
 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 
+extern unsigned long tracing_thresh;
+
 #ifdef CONFIG_TRACER_MAX_TRACE
 extern unsigned long tracing_max_latency;
-extern unsigned long tracing_thresh;
 
 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 void update_max_tr_single(struct trace_array *tr,
@@ -550,7 +551,7 @@ static inline int ftrace_trace_task(struct task_struct *task)
  * struct trace_parser - servers for reading the user input separated by spaces
  * @cont: set if the input is not complete - no final space char was found
  * @buffer: holds the parsed user input
- * @idx: user input lenght
+ * @idx: user input length
  * @size: buffer size
  */
 struct trace_parser {
diff --git a/kernel/trace/trace_clock.c b/kernel/trace/trace_clock.c
index 84a3a7ba072a..9d589d8dcd1a 100644
--- a/kernel/trace/trace_clock.c
+++ b/kernel/trace/trace_clock.c
@@ -13,6 +13,7 @@
  * Tracer plugins will chose a default from these clocks.
  */
 #include <linux/spinlock.h>
+#include <linux/irqflags.h>
 #include <linux/hardirq.h>
 #include <linux/module.h>
 #include <linux/percpu.h>
@@ -83,7 +84,7 @@ u64 notrace trace_clock_global(void)
         int this_cpu;
         u64 now;
 
-        raw_local_irq_save(flags);
+        local_irq_save(flags);
 
         this_cpu = raw_smp_processor_id();
         now = cpu_clock(this_cpu);
@@ -109,7 +110,7 @@ u64 notrace trace_clock_global(void)
         arch_spin_unlock(&trace_clock_struct.lock);
 
  out:
-        raw_local_irq_restore(flags);
+        local_irq_restore(flags);
 
         return now;
 }
diff --git a/kernel/trace/trace_event_profile.c b/kernel/trace/trace_event_perf.c
index f0d693005075..0565bb42566f 100644
--- a/kernel/trace/trace_event_profile.c
+++ b/kernel/trace/trace_event_perf.c
@@ -1,32 +1,41 @@
 /*
- * trace event based perf counter profiling
+ * trace event based perf event profiling/tracing
  *
  * Copyright (C) 2009 Red Hat Inc, Peter Zijlstra <pzijlstr@redhat.com>
- *
+ * Copyright (C) 2009-2010 Frederic Weisbecker <fweisbec@gmail.com>
  */
 
 #include <linux/module.h>
 #include <linux/kprobes.h>
 #include "trace.h"
 
+DEFINE_PER_CPU(struct pt_regs, perf_trace_regs);
+EXPORT_PER_CPU_SYMBOL_GPL(perf_trace_regs);
+
+EXPORT_SYMBOL_GPL(perf_arch_fetch_caller_regs);
 
 static char *perf_trace_buf;
 static char *perf_trace_buf_nmi;
 
-typedef typeof(char [FTRACE_MAX_PROFILE_SIZE]) perf_trace_t ;
+/*
+ * Force it to be aligned to unsigned long to avoid misaligned accesses
+ * suprises
+ */
+typedef typeof(unsigned long [PERF_MAX_TRACE_SIZE / sizeof(unsigned long)])
+        perf_trace_t;
 
 /* Count the events in use (per event id, not per instance) */
-static int      total_profile_count;
+static int      total_ref_count;
 
-static int ftrace_profile_enable_event(struct ftrace_event_call *event)
+static int perf_trace_event_enable(struct ftrace_event_call *event)
 {
         char *buf;
         int ret = -ENOMEM;
 
-        if (event->profile_count++ > 0)
+        if (event->perf_refcount++ > 0)
                 return 0;
 
-        if (!total_profile_count) {
+        if (!total_ref_count) {
                 buf = (char *)alloc_percpu(perf_trace_t);
                 if (!buf)
                         goto fail_buf;
@@ -40,35 +49,35 @@ static int ftrace_profile_enable_event(struct ftrace_event_call *event)
                 rcu_assign_pointer(perf_trace_buf_nmi, buf);
         }
 
-        ret = event->profile_enable(event);
+        ret = event->perf_event_enable(event);
         if (!ret) {
-                total_profile_count++;
+                total_ref_count++;
                 return 0;
         }
 
 fail_buf_nmi:
-        if (!total_profile_count) {
+        if (!total_ref_count) {
                 free_percpu(perf_trace_buf_nmi);
                 free_percpu(perf_trace_buf);
                 perf_trace_buf_nmi = NULL;
                 perf_trace_buf = NULL;
         }
 fail_buf:
-        event->profile_count--;
+        event->perf_refcount--;
 
         return ret;
 }
 
-int ftrace_profile_enable(int event_id)
+int perf_trace_enable(int event_id)
 {
         struct ftrace_event_call *event;
         int ret = -EINVAL;
 
         mutex_lock(&event_mutex);
         list_for_each_entry(event, &ftrace_events, list) {
-                if (event->id == event_id && event->profile_enable &&
+                if (event->id == event_id && event->perf_event_enable &&
                     try_module_get(event->mod)) {
-                        ret = ftrace_profile_enable_event(event);
+                        ret = perf_trace_event_enable(event);
                         break;
                 }
         }
@@ -77,16 +86,16 @@ int ftrace_profile_enable(int event_id)
         return ret;
 }
 
-static void ftrace_profile_disable_event(struct ftrace_event_call *event)
+static void perf_trace_event_disable(struct ftrace_event_call *event)
 {
         char *buf, *nmi_buf;
 
-        if (--event->profile_count > 0)
+        if (--event->perf_refcount > 0)
                 return;
 
-        event->profile_disable(event);
+        event->perf_event_disable(event);
 
-        if (!--total_profile_count) {
+        if (!--total_ref_count) {
                 buf = perf_trace_buf;
                 rcu_assign_pointer(perf_trace_buf, NULL);
 
@@ -104,14 +113,14 @@ static void ftrace_profile_disable_event(struct ftrace_event_call *event)
         }
 }
 
-void ftrace_profile_disable(int event_id)
+void perf_trace_disable(int event_id)
 {
         struct ftrace_event_call *event;
 
         mutex_lock(&event_mutex);
         list_for_each_entry(event, &ftrace_events, list) {
                 if (event->id == event_id) {
-                        ftrace_profile_disable_event(event);
+                        perf_trace_event_disable(event);
                         module_put(event->mod);
                         break;
                 }
@@ -119,13 +128,15 @@ void ftrace_profile_disable(int event_id)
         mutex_unlock(&event_mutex);
 }
 
-__kprobes void *ftrace_perf_buf_prepare(int size, unsigned short type,
-                                        int *rctxp, unsigned long *irq_flags)
+__kprobes void *perf_trace_buf_prepare(int size, unsigned short type,
+                                       int *rctxp, unsigned long *irq_flags)
 {
         struct trace_entry *entry;
         char *trace_buf, *raw_data;
         int pc, cpu;
 
+        BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(unsigned long));
+
         pc = preempt_count();
 
         /* Protect the per cpu buffer, begin the rcu read side */
@@ -138,9 +149,9 @@ __kprobes void *ftrace_perf_buf_prepare(int size, unsigned short type,
         cpu = smp_processor_id();
 
         if (in_nmi())
-                trace_buf = rcu_dereference(perf_trace_buf_nmi);
+                trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
         else
-                trace_buf = rcu_dereference(perf_trace_buf);
+                trace_buf = rcu_dereference_sched(perf_trace_buf);
 
         if (!trace_buf)
                 goto err;
@@ -148,7 +159,7 @@ __kprobes void *ftrace_perf_buf_prepare(int size, unsigned short type,
         raw_data = per_cpu_ptr(trace_buf, cpu);
 
         /* zero the dead bytes from align to not leak stack to user */
-        *(u64 *)(&raw_data[size - sizeof(u64)]) = 0ULL;
+        memset(&raw_data[size - sizeof(u64)], 0, sizeof(u64));
 
         entry = (struct trace_entry *)raw_data;
         tracing_generic_entry_update(entry, *irq_flags, pc);
@@ -161,4 +172,4 @@ err_recursion:
         local_irq_restore(*irq_flags);
         return NULL;
 }
-EXPORT_SYMBOL_GPL(ftrace_perf_buf_prepare);
+EXPORT_SYMBOL_GPL(perf_trace_buf_prepare);
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 3f972ad98d04..c697c7043349 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -15,6 +15,7 @@
 #include <linux/uaccess.h>
 #include <linux/module.h>
 #include <linux/ctype.h>
+#include <linux/slab.h>
 #include <linux/delay.h>
 
 #include <asm/setup.h>
@@ -938,7 +939,7 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
                 trace_create_file("enable", 0644, call->dir, call,
                                   enable);
 
-        if (call->id && call->profile_enable)
+        if (call->id && call->perf_event_enable)
                 trace_create_file("id", 0444, call->dir, call,
                                   id);
 
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 4615f62a04f1..88c0b6dbd7fe 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -22,6 +22,7 @@
 #include <linux/ctype.h>
 #include <linux/mutex.h>
 #include <linux/perf_event.h>
+#include <linux/slab.h>
 
 #include "trace.h"
 #include "trace_output.h"
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 3fc2a575664f..9aed1a5cf553 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -9,6 +9,7 @@
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/ftrace.h>
+#include <linux/slab.h>
 #include <linux/fs.h>
 
 #include "trace.h"
@@ -237,6 +238,14 @@ int trace_graph_entry(struct ftrace_graph_ent *trace)
         return ret;
 }
 
+int trace_graph_thresh_entry(struct ftrace_graph_ent *trace)
+{
+        if (tracing_thresh)
+                return 1;
+        else
+                return trace_graph_entry(trace);
+}
+
 static void __trace_graph_return(struct trace_array *tr,
                                 struct ftrace_graph_ret *trace,
                                 unsigned long flags,
@@ -290,13 +299,26 @@ void set_graph_array(struct trace_array *tr)
         smp_mb();
 }
 
+void trace_graph_thresh_return(struct ftrace_graph_ret *trace)
+{
+        if (tracing_thresh &&
+            (trace->rettime - trace->calltime < tracing_thresh))
+                return;
+        else
+                trace_graph_return(trace);
+}
+
 static int graph_trace_init(struct trace_array *tr)
 {
         int ret;
 
         set_graph_array(tr);
-        ret = register_ftrace_graph(&trace_graph_return,
-                                    &trace_graph_entry);
+        if (tracing_thresh)
+                ret = register_ftrace_graph(&trace_graph_thresh_return,
+                                            &trace_graph_thresh_entry);
+        else
+                ret = register_ftrace_graph(&trace_graph_return,
+                                            &trace_graph_entry);
         if (ret)
                 return ret;
         tracing_start_cmdline_record();
@@ -920,7 +942,7 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
         } else {
-                ret = trace_seq_printf(s, "} (%ps)\n", (void *)trace->func);
+                ret = trace_seq_printf(s, "} /* %ps */\n", (void *)trace->func);
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
         }
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 505c92273b1a..1251e367bae9 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1214,7 +1214,7 @@ static int set_print_fmt(struct trace_probe *tp)
 #ifdef CONFIG_PERF_EVENTS
 
 /* Kprobe profile handler */
-static __kprobes void kprobe_profile_func(struct kprobe *kp,
+static __kprobes void kprobe_perf_func(struct kprobe *kp,
                                          struct pt_regs *regs)
 {
         struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp);
@@ -1227,11 +1227,11 @@ static __kprobes void kprobe_profile_func(struct kprobe *kp,
         __size = SIZEOF_KPROBE_TRACE_ENTRY(tp->nr_args);
         size = ALIGN(__size + sizeof(u32), sizeof(u64));
         size -= sizeof(u32);
-        if (WARN_ONCE(size > FTRACE_MAX_PROFILE_SIZE,
+        if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
                      "profile buffer not large enough"))
                 return;
 
-        entry = ftrace_perf_buf_prepare(size, call->id, &rctx, &irq_flags);
+        entry = perf_trace_buf_prepare(size, call->id, &rctx, &irq_flags);
         if (!entry)
                 return;
 
@@ -1240,11 +1240,11 @@ static __kprobes void kprobe_profile_func(struct kprobe *kp,
         for (i = 0; i < tp->nr_args; i++)
                 entry->args[i] = call_fetch(&tp->args[i].fetch, regs);
 
-        ftrace_perf_buf_submit(entry, size, rctx, entry->ip, 1, irq_flags);
+        perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, irq_flags, regs);
 }
 
 /* Kretprobe profile handler */
-static __kprobes void kretprobe_profile_func(struct kretprobe_instance *ri,
+static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri,
                                             struct pt_regs *regs)
 {
         struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
@@ -1257,11 +1257,11 @@ static __kprobes void kretprobe_profile_func(struct kretprobe_instance *ri,
         __size = SIZEOF_KRETPROBE_TRACE_ENTRY(tp->nr_args);
         size = ALIGN(__size + sizeof(u32), sizeof(u64));
         size -= sizeof(u32);
-        if (WARN_ONCE(size > FTRACE_MAX_PROFILE_SIZE,
+        if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
                      "profile buffer not large enough"))
                 return;
 
-        entry = ftrace_perf_buf_prepare(size, call->id, &rctx, &irq_flags);
+        entry = perf_trace_buf_prepare(size, call->id, &rctx, &irq_flags);
         if (!entry)
                 return;
 
@@ -1271,10 +1271,11 @@ static __kprobes void kretprobe_profile_func(struct kretprobe_instance *ri,
         for (i = 0; i < tp->nr_args; i++)
                 entry->args[i] = call_fetch(&tp->args[i].fetch, regs);
 
-        ftrace_perf_buf_submit(entry, size, rctx, entry->ret_ip, 1, irq_flags);
+        perf_trace_buf_submit(entry, size, rctx, entry->ret_ip, 1,
+                               irq_flags, regs);
 }
 
-static int probe_profile_enable(struct ftrace_event_call *call)
+static int probe_perf_enable(struct ftrace_event_call *call)
 {
         struct trace_probe *tp = (struct trace_probe *)call->data;
 
@@ -1286,7 +1287,7 @@ static int probe_profile_enable(struct ftrace_event_call *call)
                 return enable_kprobe(&tp->rp.kp);
 }
 
-static void probe_profile_disable(struct ftrace_event_call *call)
+static void probe_perf_disable(struct ftrace_event_call *call)
 {
         struct trace_probe *tp = (struct trace_probe *)call->data;
 
@@ -1311,7 +1312,7 @@ int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs)
                 kprobe_trace_func(kp, regs);
 #ifdef CONFIG_PERF_EVENTS
         if (tp->flags & TP_FLAG_PROFILE)
-                kprobe_profile_func(kp, regs);
+                kprobe_perf_func(kp, regs);
 #endif
         return 0;       /* We don't tweek kernel, so just return 0 */
 }
@@ -1325,7 +1326,7 @@ int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs)
                 kretprobe_trace_func(ri, regs);
 #ifdef CONFIG_PERF_EVENTS
         if (tp->flags & TP_FLAG_PROFILE)
-                kretprobe_profile_func(ri, regs);
+                kretprobe_perf_func(ri, regs);
 #endif
         return 0;       /* We don't tweek kernel, so just return 0 */
 }
@@ -1358,8 +1359,8 @@ static int register_probe_event(struct trace_probe *tp)
         call->unregfunc = probe_event_disable;
 
 #ifdef CONFIG_PERF_EVENTS
-        call->profile_enable = probe_profile_enable;
-        call->profile_disable = probe_profile_disable;
+        call->perf_event_enable = probe_perf_enable;
+        call->perf_event_disable = probe_perf_disable;
 #endif
         call->data = tp;
         ret = trace_add_event_call(call);
diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c
index 94103cdcf9d8..d59cd6879477 100644
--- a/kernel/trace/trace_ksym.c
+++ b/kernel/trace/trace_ksym.c
@@ -23,6 +23,7 @@
 #include <linux/debugfs.h>
 #include <linux/ftrace.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/fs.h>
 
 #include "trace_output.h"
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index 0acd834659ed..017fa376505d 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -9,6 +9,7 @@
 #include <linux/kernel.h>
 #include <linux/mmiotrace.h>
 #include <linux/pci.h>
+#include <linux/slab.h>
 #include <linux/time.h>
 
 #include <asm/atomic.h>
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 280fea470d67..81003b4d617f 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -3,6 +3,7 @@
 #include <linux/stringify.h>
 #include <linux/kthread.h>
 #include <linux/delay.h>
+#include <linux/slab.h>
 
 static inline int trace_valid_entry(struct trace_entry *entry)
 {
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index a4bb239eb987..96cffb269e73 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -10,6 +10,7 @@
 
 
 #include <linux/list.h>
+#include <linux/slab.h>
 #include <linux/rbtree.h>
 #include <linux/debugfs.h>
 #include "trace_stat.h"
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index cba47d7935cc..4d6d711717f2 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -1,5 +1,6 @@
 #include <trace/syscall.h>
 #include <trace/events/syscalls.h>
+#include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/ftrace.h>
 #include <linux/perf_event.h>
@@ -428,12 +429,12 @@ core_initcall(init_ftrace_syscalls);
 
 #ifdef CONFIG_PERF_EVENTS
 
-static DECLARE_BITMAP(enabled_prof_enter_syscalls, NR_syscalls);
-static DECLARE_BITMAP(enabled_prof_exit_syscalls, NR_syscalls);
-static int sys_prof_refcount_enter;
-static int sys_prof_refcount_exit;
+static DECLARE_BITMAP(enabled_perf_enter_syscalls, NR_syscalls);
+static DECLARE_BITMAP(enabled_perf_exit_syscalls, NR_syscalls);
+static int sys_perf_refcount_enter;
+static int sys_perf_refcount_exit;
 
-static void prof_syscall_enter(struct pt_regs *regs, long id)
+static void perf_syscall_enter(struct pt_regs *regs, long id)
 {
         struct syscall_metadata *sys_data;
         struct syscall_trace_enter *rec;
@@ -443,7 +444,7 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
         int size;
 
         syscall_nr = syscall_get_nr(current, regs);
-        if (!test_bit(syscall_nr, enabled_prof_enter_syscalls))
+        if (!test_bit(syscall_nr, enabled_perf_enter_syscalls))
                 return;
 
         sys_data = syscall_nr_to_meta(syscall_nr);
@@ -455,11 +456,11 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
         size = ALIGN(size + sizeof(u32), sizeof(u64));
         size -= sizeof(u32);
 
-        if (WARN_ONCE(size > FTRACE_MAX_PROFILE_SIZE,
-                      "profile buffer not large enough"))
+        if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
+                      "perf buffer not large enough"))
                 return;
 
-        rec = (struct syscall_trace_enter *)ftrace_perf_buf_prepare(size,
+        rec = (struct syscall_trace_enter *)perf_trace_buf_prepare(size,
                                 sys_data->enter_event->id, &rctx, &flags);
         if (!rec)
                 return;
@@ -467,10 +468,10 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
         rec->nr = syscall_nr;
         syscall_get_arguments(current, regs, 0, sys_data->nb_args,
                                (unsigned long *)&rec->args);
-        ftrace_perf_buf_submit(rec, size, rctx, 0, 1, flags);
+        perf_trace_buf_submit(rec, size, rctx, 0, 1, flags, regs);
 }
 
-int prof_sysenter_enable(struct ftrace_event_call *call)
+int perf_sysenter_enable(struct ftrace_event_call *call)
 {
         int ret = 0;
         int num;
@@ -478,34 +479,34 @@ int prof_sysenter_enable(struct ftrace_event_call *call)
         num = ((struct syscall_metadata *)call->data)->syscall_nr;
 
         mutex_lock(&syscall_trace_lock);
-        if (!sys_prof_refcount_enter)
-                ret = register_trace_sys_enter(prof_syscall_enter);
+        if (!sys_perf_refcount_enter)
+                ret = register_trace_sys_enter(perf_syscall_enter);
         if (ret) {
                 pr_info("event trace: Could not activate"
                                 "syscall entry trace point");
         } else {
-                set_bit(num, enabled_prof_enter_syscalls);
-                sys_prof_refcount_enter++;
+                set_bit(num, enabled_perf_enter_syscalls);
+                sys_perf_refcount_enter++;
         }
         mutex_unlock(&syscall_trace_lock);
         return ret;
 }
 
-void prof_sysenter_disable(struct ftrace_event_call *call)
+void perf_sysenter_disable(struct ftrace_event_call *call)
 {
         int num;
 
         num = ((struct syscall_metadata *)call->data)->syscall_nr;
 
         mutex_lock(&syscall_trace_lock);
-        sys_prof_refcount_enter--;
-        clear_bit(num, enabled_prof_enter_syscalls);
-        if (!sys_prof_refcount_enter)
-                unregister_trace_sys_enter(prof_syscall_enter);
+        sys_perf_refcount_enter--;
+        clear_bit(num, enabled_perf_enter_syscalls);
+        if (!sys_perf_refcount_enter)
+                unregister_trace_sys_enter(perf_syscall_enter);
         mutex_unlock(&syscall_trace_lock);
 }
 
-static void prof_syscall_exit(struct pt_regs *regs, long ret)
+static void perf_syscall_exit(struct pt_regs *regs, long ret)
 {
         struct syscall_metadata *sys_data;
         struct syscall_trace_exit *rec;
@@ -515,7 +516,7 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
         int size;
 
         syscall_nr = syscall_get_nr(current, regs);
-        if (!test_bit(syscall_nr, enabled_prof_exit_syscalls))
+        if (!test_bit(syscall_nr, enabled_perf_exit_syscalls))
                 return;
 
         sys_data = syscall_nr_to_meta(syscall_nr);
@@ -530,11 +531,11 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
          * Impossible, but be paranoid with the future
          * How to put this check outside runtime?
          */
-        if (WARN_ONCE(size > FTRACE_MAX_PROFILE_SIZE,
-                "exit event has grown above profile buffer size"))
+        if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
+                "exit event has grown above perf buffer size"))
                 return;
 
-        rec = (struct syscall_trace_exit *)ftrace_perf_buf_prepare(size,
+        rec = (struct syscall_trace_exit *)perf_trace_buf_prepare(size,
                                 sys_data->exit_event->id, &rctx, &flags);
         if (!rec)
                 return;
@@ -542,10 +543,10 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
         rec->nr = syscall_nr;
         rec->ret = syscall_get_return_value(current, regs);
 
-        ftrace_perf_buf_submit(rec, size, rctx, 0, 1, flags);
+        perf_trace_buf_submit(rec, size, rctx, 0, 1, flags, regs);
 }
 
-int prof_sysexit_enable(struct ftrace_event_call *call)
+int perf_sysexit_enable(struct ftrace_event_call *call)
 {
         int ret = 0;
         int num;
@@ -553,30 +554,30 @@ int prof_sysexit_enable(struct ftrace_event_call *call)
         num = ((struct syscall_metadata *)call->data)->syscall_nr;
 
         mutex_lock(&syscall_trace_lock);
-        if (!sys_prof_refcount_exit)
-                ret = register_trace_sys_exit(prof_syscall_exit);
+        if (!sys_perf_refcount_exit)
+                ret = register_trace_sys_exit(perf_syscall_exit);
         if (ret) {
                 pr_info("event trace: Could not activate"
                                 "syscall exit trace point");
         } else {
-                set_bit(num, enabled_prof_exit_syscalls);
-                sys_prof_refcount_exit++;
+                set_bit(num, enabled_perf_exit_syscalls);
+                sys_perf_refcount_exit++;
         }
         mutex_unlock(&syscall_trace_lock);
         return ret;
 }
 
-void prof_sysexit_disable(struct ftrace_event_call *call)
+void perf_sysexit_disable(struct ftrace_event_call *call)
 {
         int num;
 
         num = ((struct syscall_metadata *)call->data)->syscall_nr;
 
         mutex_lock(&syscall_trace_lock);
-        sys_prof_refcount_exit--;
-        clear_bit(num, enabled_prof_exit_syscalls);
-        if (!sys_prof_refcount_exit)
-                unregister_trace_sys_exit(prof_syscall_exit);
+        sys_perf_refcount_exit--;
+        clear_bit(num, enabled_perf_exit_syscalls);
+        if (!sys_perf_refcount_exit)
+                unregister_trace_sys_exit(perf_syscall_exit);
         mutex_unlock(&syscall_trace_lock);
 }
 
diff --git a/kernel/trace/trace_workqueue.c b/kernel/trace/trace_workqueue.c
index 40cafb07dffd..cc2d2faa7d9e 100644
--- a/kernel/trace/trace_workqueue.c
+++ b/kernel/trace/trace_workqueue.c
@@ -9,6 +9,7 @@
 #include <trace/events/workqueue.h>
 #include <linux/list.h>
 #include <linux/percpu.h>
+#include <linux/slab.h>
 #include <linux/kref.h>
 #include "trace_stat.h"
 #include "trace.h"
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 00d59d048edf..0a67e041edf8 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -21,6 +21,7 @@
 #include <linux/tsacct_kern.h>
 #include <linux/acct.h>
 #include <linux/jiffies.h>
+#include <linux/mm.h>
 
 /*
  * fill in basic accounting fields