123 files changed, 14701 insertions, 4562 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index 42423665660a..0a32cb21ec97 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -11,6 +11,7 @@ obj-y     = sched.o fork.o exec_domain.o panic.o printk.o \
             hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
             notifier.o ksysfs.o pm_qos_params.o sched_clock.o cred.o \
             async.o
+obj-y += groups.o
 
 ifdef CONFIG_FUNCTION_TRACER
 # Do not trace debug files and internal ftrace files
@@ -70,6 +71,7 @@ obj-$(CONFIG_STOP_MACHINE) += stop_machine.o
 obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
 obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
 obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
+obj-$(CONFIG_GCOV_KERNEL) += gcov/
 obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
 obj-$(CONFIG_KPROBES) += kprobes.o
 obj-$(CONFIG_KGDB) += kgdb.o
@@ -93,8 +95,10 @@ obj-$(CONFIG_LATENCYTOP) += latencytop.o
 obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
 obj-$(CONFIG_FUNCTION_TRACER) += trace/
 obj-$(CONFIG_TRACING) += trace/
+obj-$(CONFIG_X86_DS) += trace/
 obj-$(CONFIG_SMP) += sched_cpupri.o
 obj-$(CONFIG_SLOW_WORK) += slow-work.o
+obj-$(CONFIG_PERF_COUNTERS) += perf_counter.o
 
 ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
 # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
diff --git a/kernel/async.c b/kernel/async.c
index 968ef9457d4e..27235f5de198 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -92,19 +92,18 @@ extern int initcall_debug;
 static async_cookie_t  __lowest_in_progress(struct list_head *running)
 {
         struct async_entry *entry;
+
         if (!list_empty(running)) {
                 entry = list_first_entry(running,
                         struct async_entry, list);
                 return entry->cookie;
-        } else if (!list_empty(&async_pending)) {
-                entry = list_first_entry(&async_pending,
-                        struct async_entry, list);
-                return entry->cookie;
-        } else {
-                /* nothing in progress... next_cookie is "infinity" */
-                return next_cookie;
         }
 
+        list_for_each_entry(entry, &async_pending, list)
+                if (entry->running == running)
+                        return entry->cookie;
+
+        return next_cookie;     /* "infinity" value */
 }
 
 static async_cookie_t  lowest_in_progress(struct list_head *running)
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index 6e7351739a82..1f6396d76687 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -568,7 +568,7 @@ void audit_trim_trees(void)
                 if (err)
                         goto skip_it;
 
-                root_mnt = collect_mounts(path.mnt, path.dentry);
+                root_mnt = collect_mounts(&path);
                 path_put(&path);
                 if (!root_mnt)
                         goto skip_it;
@@ -660,7 +660,7 @@ int audit_add_tree_rule(struct audit_krule *rule)
         err = kern_path(tree->pathname, 0, &path);
         if (err)
                 goto Err;
-        mnt = collect_mounts(path.mnt, path.dentry);
+        mnt = collect_mounts(&path);
         path_put(&path);
         if (!mnt) {
                 err = -ENOMEM;
@@ -720,7 +720,7 @@ int audit_tag_tree(char *old, char *new)
         err = kern_path(new, 0, &path);
         if (err)
                 return err;
-        tagged = collect_mounts(path.mnt, path.dentry);
+        tagged = collect_mounts(&path);
         path_put(&path);
         if (!tagged)
                 return -ENOMEM;
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a7267bfd3765..3737a682cdf5 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -46,6 +46,7 @@
 #include <linux/cgroupstats.h>
 #include <linux/hash.h>
 #include <linux/namei.h>
+#include <linux/smp_lock.h>
 
 #include <asm/atomic.h>
 
@@ -842,6 +843,11 @@ static int parse_cgroupfs_options(char *data,
                                      struct cgroup_sb_opts *opts)
 {
         char *token, *o = data ?: "all";
+        unsigned long mask = (unsigned long)-1;
+
+#ifdef CONFIG_CPUSETS
+        mask = ~(1UL << cpuset_subsys_id);
+#endif
 
         opts->subsys_bits = 0;
         opts->flags = 0;
@@ -886,6 +892,15 @@ static int parse_cgroupfs_options(char *data,
                 }
         }
 
+        /*
+         * Option noprefix was introduced just for backward compatibility
+         * with the old cpuset, so we allow noprefix only if mounting just
+         * the cpuset subsystem.
+         */
+        if (test_bit(ROOT_NOPREFIX, &opts->flags) &&
+            (opts->subsys_bits & mask))
+                return -EINVAL;
+
         /* We can't have an empty hierarchy */
         if (!opts->subsys_bits)
                 return -EINVAL;
@@ -900,6 +915,7 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
         struct cgroup *cgrp = &root->top_cgroup;
         struct cgroup_sb_opts opts;
 
+        lock_kernel();
         mutex_lock(&cgrp->dentry->d_inode->i_mutex);
         mutex_lock(&cgroup_mutex);
 
@@ -927,6 +943,7 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
         kfree(opts.release_agent);
         mutex_unlock(&cgroup_mutex);
         mutex_unlock(&cgrp->dentry->d_inode->i_mutex);
+        unlock_kernel();
         return ret;
 }
 
diff --git a/kernel/compat.c b/kernel/compat.c
index 42d56544460f..f6c204f07ea6 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -882,6 +882,17 @@ compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
 
 }
 
+asmlinkage long
+compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
+                             struct compat_siginfo __user *uinfo)
+{
+        siginfo_t info;
+
+        if (copy_siginfo_from_user32(&info, uinfo))
+                return -EFAULT;
+        return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
+}
+
 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 
 /* compat_time_t is a 32 bit "long" and needs to get converted. */
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 026faccca869..7e75a41bd508 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -97,12 +97,6 @@ struct cpuset {
 
         struct cpuset *parent;          /* my parent */
 
-        /*
-         * Copy of global cpuset_mems_generation as of the most
-         * recent time this cpuset changed its mems_allowed.
-         */
-        int mems_generation;
-
         struct fmeter fmeter;           /* memory_pressure filter */
 
         /* partition number for rebuild_sched_domains() */
@@ -176,27 +170,6 @@ static inline int is_spread_slab(const struct cpuset *cs)
         return test_bit(CS_SPREAD_SLAB, &cs->flags);
 }
 
-/*
- * Increment this integer everytime any cpuset changes its
- * mems_allowed value.  Users of cpusets can track this generation
- * number, and avoid having to lock and reload mems_allowed unless
- * the cpuset they're using changes generation.
- *
- * A single, global generation is needed because cpuset_attach_task() could
- * reattach a task to a different cpuset, which must not have its
- * generation numbers aliased with those of that tasks previous cpuset.
- *
- * Generations are needed for mems_allowed because one task cannot
- * modify another's memory placement.  So we must enable every task,
- * on every visit to __alloc_pages(), to efficiently check whether
- * its current->cpuset->mems_allowed has changed, requiring an update
- * of its current->mems_allowed.
- *
- * Since writes to cpuset_mems_generation are guarded by the cgroup lock
- * there is no need to mark it atomic.
- */
-static int cpuset_mems_generation;
-
 static struct cpuset top_cpuset = {
         .flags = ((1 << CS_CPU_EXCLUSIVE) | (1 << CS_MEM_EXCLUSIVE)),
 };
@@ -228,8 +201,9 @@ static struct cpuset top_cpuset = {
  * If a task is only holding callback_mutex, then it has read-only
  * access to cpusets.
  *
- * The task_struct fields mems_allowed and mems_generation may only
- * be accessed in the context of that task, so require no locks.
+ * Now, the task_struct fields mems_allowed and mempolicy may be changed
+ * by other task, we use alloc_lock in the task_struct fields to protect
+ * them.
  *
  * The cpuset_common_file_read() handlers only hold callback_mutex across
  * small pieces of code, such as when reading out possibly multi-word
@@ -331,75 +305,22 @@ static void guarantee_online_mems(const struct cpuset *cs, nodemask_t *pmask)
         BUG_ON(!nodes_intersects(*pmask, node_states[N_HIGH_MEMORY]));
 }
 
-/**
- * cpuset_update_task_memory_state - update task memory placement
- *
- * If the current tasks cpusets mems_allowed changed behind our
- * backs, update current->mems_allowed, mems_generation and task NUMA
- * mempolicy to the new value.
- *
- * Task mempolicy is updated by rebinding it relative to the
- * current->cpuset if a task has its memory placement changed.
- * Do not call this routine if in_interrupt().
- *
- * Call without callback_mutex or task_lock() held.  May be
- * called with or without cgroup_mutex held.  Thanks in part to
- * 'the_top_cpuset_hack', the task's cpuset pointer will never
- * be NULL.  This routine also might acquire callback_mutex during
- * call.
- *
- * Reading current->cpuset->mems_generation doesn't need task_lock
- * to guard the current->cpuset derefence, because it is guarded
- * from concurrent freeing of current->cpuset using RCU.
- *
- * The rcu_dereference() is technically probably not needed,
- * as I don't actually mind if I see a new cpuset pointer but
- * an old value of mems_generation.  However this really only
- * matters on alpha systems using cpusets heavily.  If I dropped
- * that rcu_dereference(), it would save them a memory barrier.
- * For all other arch's, rcu_dereference is a no-op anyway, and for
- * alpha systems not using cpusets, another planned optimization,
- * avoiding the rcu critical section for tasks in the root cpuset
- * which is statically allocated, so can't vanish, will make this
- * irrelevant.  Better to use RCU as intended, than to engage in
- * some cute trick to save a memory barrier that is impossible to
- * test, for alpha systems using cpusets heavily, which might not
- * even exist.
- *
- * This routine is needed to update the per-task mems_allowed data,
- * within the tasks context, when it is trying to allocate memory
- * (in various mm/mempolicy.c routines) and notices that some other
- * task has been modifying its cpuset.
+/*
+ * update task's spread flag if cpuset's page/slab spread flag is set
+ *
+ * Called with callback_mutex/cgroup_mutex held
  */
-
-void cpuset_update_task_memory_state(void)
+static void cpuset_update_task_spread_flag(struct cpuset *cs,
+                                        struct task_struct *tsk)
 {
-        int my_cpusets_mem_gen;
-        struct task_struct *tsk = current;
-        struct cpuset *cs;
-
-        rcu_read_lock();
-        my_cpusets_mem_gen = task_cs(tsk)->mems_generation;
-        rcu_read_unlock();
-
-        if (my_cpusets_mem_gen != tsk->cpuset_mems_generation) {
-                mutex_lock(&callback_mutex);
-                task_lock(tsk);
-                cs = task_cs(tsk); /* Maybe changed when task not locked */
-                guarantee_online_mems(cs, &tsk->mems_allowed);
-                tsk->cpuset_mems_generation = cs->mems_generation;
-                if (is_spread_page(cs))
-                        tsk->flags |= PF_SPREAD_PAGE;
-                else
-                        tsk->flags &= ~PF_SPREAD_PAGE;
-                if (is_spread_slab(cs))
-                        tsk->flags |= PF_SPREAD_SLAB;
-                else
-                        tsk->flags &= ~PF_SPREAD_SLAB;
-                task_unlock(tsk);
-                mutex_unlock(&callback_mutex);
-                mpol_rebind_task(tsk, &tsk->mems_allowed);
-        }
+        if (is_spread_page(cs))
+                tsk->flags |= PF_SPREAD_PAGE;
+        else
+                tsk->flags &= ~PF_SPREAD_PAGE;
+        if (is_spread_slab(cs))
+                tsk->flags |= PF_SPREAD_SLAB;
+        else
+                tsk->flags &= ~PF_SPREAD_SLAB;
 }
 
 /*
@@ -1007,14 +928,6 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
  *    other task, the task_struct mems_allowed that we are hacking
  *    is for our current task, which must allocate new pages for that
  *    migrating memory region.
- *
- *    We call cpuset_update_task_memory_state() before hacking
- *    our tasks mems_allowed, so that we are assured of being in
- *    sync with our tasks cpuset, and in particular, callbacks to
- *    cpuset_update_task_memory_state() from nested page allocations
- *    won't see any mismatch of our cpuset and task mems_generation
- *    values, so won't overwrite our hacked tasks mems_allowed
- *    nodemask.
  */
 
 static void cpuset_migrate_mm(struct mm_struct *mm, const nodemask_t *from,
@@ -1022,22 +935,37 @@ static void cpuset_migrate_mm(struct mm_struct *mm, const nodemask_t *from,
 {
         struct task_struct *tsk = current;
 
-        cpuset_update_task_memory_state();
-
-        mutex_lock(&callback_mutex);
         tsk->mems_allowed = *to;
-        mutex_unlock(&callback_mutex);
 
         do_migrate_pages(mm, from, to, MPOL_MF_MOVE_ALL);
 
-        mutex_lock(&callback_mutex);
         guarantee_online_mems(task_cs(tsk),&tsk->mems_allowed);
-        mutex_unlock(&callback_mutex);
 }
 
 /*
- * Rebind task's vmas to cpuset's new mems_allowed, and migrate pages to new
- * nodes if memory_migrate flag is set. Called with cgroup_mutex held.
+ * cpuset_change_task_nodemask - change task's mems_allowed and mempolicy
+ * @tsk: the task to change
+ * @newmems: new nodes that the task will be set
+ *
+ * In order to avoid seeing no nodes if the old and new nodes are disjoint,
+ * we structure updates as setting all new allowed nodes, then clearing newly
+ * disallowed ones.
+ *
+ * Called with task's alloc_lock held
+ */
+static void cpuset_change_task_nodemask(struct task_struct *tsk,
+                                        nodemask_t *newmems)
+{
+        nodes_or(tsk->mems_allowed, tsk->mems_allowed, *newmems);
+        mpol_rebind_task(tsk, &tsk->mems_allowed);
+        mpol_rebind_task(tsk, newmems);
+        tsk->mems_allowed = *newmems;
+}
+
+/*
+ * Update task's mems_allowed and rebind its mempolicy and vmas' mempolicy
+ * of it to cpuset's new mems_allowed, and migrate pages to new nodes if
+ * memory_migrate flag is set. Called with cgroup_mutex held.
  */
 static void cpuset_change_nodemask(struct task_struct *p,
                                    struct cgroup_scanner *scan)
@@ -1046,12 +974,19 @@ static void cpuset_change_nodemask(struct task_struct *p,
         struct cpuset *cs;
         int migrate;
         const nodemask_t *oldmem = scan->data;
+        nodemask_t newmems;
+
+        cs = cgroup_cs(scan->cg);
+        guarantee_online_mems(cs, &newmems);
+
+        task_lock(p);
+        cpuset_change_task_nodemask(p, &newmems);
+        task_unlock(p);
 
         mm = get_task_mm(p);
         if (!mm)
                 return;
 
-        cs = cgroup_cs(scan->cg);
         migrate = is_memory_migrate(cs);
 
         mpol_rebind_mm(mm, &cs->mems_allowed);
@@ -1104,10 +1039,10 @@ static void update_tasks_nodemask(struct cpuset *cs, const nodemask_t *oldmem,
 /*
  * Handle user request to change the 'mems' memory placement
  * of a cpuset.  Needs to validate the request, update the
- * cpusets mems_allowed and mems_generation, and for each
- * task in the cpuset, rebind any vma mempolicies and if
- * the cpuset is marked 'memory_migrate', migrate the tasks
- * pages to the new memory.
+ * cpusets mems_allowed, and for each task in the cpuset,
+ * update mems_allowed and rebind task's mempolicy and any vma
+ * mempolicies and if the cpuset is marked 'memory_migrate',
+ * migrate the tasks pages to the new memory.
  *
  * Call with cgroup_mutex held.  May take callback_mutex during call.
  * Will take tasklist_lock, scan tasklist for tasks in cpuset cs,
@@ -1160,7 +1095,6 @@ static int update_nodemask(struct cpuset *cs, struct cpuset *trialcs,
 
         mutex_lock(&callback_mutex);
         cs->mems_allowed = trialcs->mems_allowed;
-        cs->mems_generation = cpuset_mems_generation++;
         mutex_unlock(&callback_mutex);
 
         update_tasks_nodemask(cs, &oldmem, &heap);
@@ -1193,6 +1127,46 @@ static int update_relax_domain_level(struct cpuset *cs, s64 val)
 }
 
 /*
+ * cpuset_change_flag - make a task's spread flags the same as its cpuset's
+ * @tsk: task to be updated
+ * @scan: struct cgroup_scanner containing the cgroup of the task
+ *
+ * Called by cgroup_scan_tasks() for each task in a cgroup.
+ *
+ * We don't need to re-check for the cgroup/cpuset membership, since we're
+ * holding cgroup_lock() at this point.
+ */
+static void cpuset_change_flag(struct task_struct *tsk,
+                                struct cgroup_scanner *scan)
+{
+        cpuset_update_task_spread_flag(cgroup_cs(scan->cg), tsk);
+}
+
+/*
+ * update_tasks_flags - update the spread flags of tasks in the cpuset.
+ * @cs: the cpuset in which each task's spread flags needs to be changed
+ * @heap: if NULL, defer allocating heap memory to cgroup_scan_tasks()
+ *
+ * Called with cgroup_mutex held
+ *
+ * The cgroup_scan_tasks() function will scan all the tasks in a cgroup,
+ * calling callback functions for each.
+ *
+ * No return value. It's guaranteed that cgroup_scan_tasks() always returns 0
+ * if @heap != NULL.
+ */
+static void update_tasks_flags(struct cpuset *cs, struct ptr_heap *heap)
+{
+        struct cgroup_scanner scan;
+
+        scan.cg = cs->css.cgroup;
+        scan.test_task = NULL;
+        scan.process_task = cpuset_change_flag;
+        scan.heap = heap;
+        cgroup_scan_tasks(&scan);
+}
+
+/*
  * update_flag - read a 0 or a 1 in a file and update associated flag
  * bit:         the bit to update (see cpuset_flagbits_t)
  * cs:          the cpuset to update
@@ -1205,8 +1179,10 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
                        int turning_on)
 {
         struct cpuset *trialcs;
-        int err;
         int balance_flag_changed;
+        int spread_flag_changed;
+        struct ptr_heap heap;
+        int err;
 
         trialcs = alloc_trial_cpuset(cs);
         if (!trialcs)
@@ -1221,9 +1197,16 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
         if (err < 0)
                 goto out;
 
+        err = heap_init(&heap, PAGE_SIZE, GFP_KERNEL, NULL);
+        if (err < 0)
+                goto out;
+
         balance_flag_changed = (is_sched_load_balance(cs) !=
                                 is_sched_load_balance(trialcs));
 
+        spread_flag_changed = ((is_spread_slab(cs) != is_spread_slab(trialcs))
+                        || (is_spread_page(cs) != is_spread_page(trialcs)));
+
         mutex_lock(&callback_mutex);
         cs->flags = trialcs->flags;
         mutex_unlock(&callback_mutex);
@@ -1231,6 +1214,9 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
         if (!cpumask_empty(trialcs->cpus_allowed) && balance_flag_changed)
                 async_rebuild_sched_domains();
 
+        if (spread_flag_changed)
+                update_tasks_flags(cs, &heap);
+        heap_free(&heap);
 out:
         free_trial_cpuset(trialcs);
         return err;
@@ -1372,15 +1358,20 @@ static void cpuset_attach(struct cgroup_subsys *ss,
 
         if (cs == &top_cpuset) {
                 cpumask_copy(cpus_attach, cpu_possible_mask);
+                to = node_possible_map;
         } else {
-                mutex_lock(&callback_mutex);
                 guarantee_online_cpus(cs, cpus_attach);
-                mutex_unlock(&callback_mutex);
+                guarantee_online_mems(cs, &to);
         }
         err = set_cpus_allowed_ptr(tsk, cpus_attach);
         if (err)
                 return;
 
+        task_lock(tsk);
+        cpuset_change_task_nodemask(tsk, &to);
+        task_unlock(tsk);
+        cpuset_update_task_spread_flag(cs, tsk);
+
         from = oldcs->mems_allowed;
         to = cs->mems_allowed;
         mm = get_task_mm(tsk);
@@ -1442,11 +1433,9 @@ static int cpuset_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val)
                 break;
         case FILE_SPREAD_PAGE:
                 retval = update_flag(CS_SPREAD_PAGE, cs, val);
-                cs->mems_generation = cpuset_mems_generation++;
                 break;
         case FILE_SPREAD_SLAB:
                 retval = update_flag(CS_SPREAD_SLAB, cs, val);
-                cs->mems_generation = cpuset_mems_generation++;
                 break;
         default:
                 retval = -EINVAL;
@@ -1786,8 +1775,6 @@ static struct cgroup_subsys_state *cpuset_create(
         struct cpuset *parent;
 
         if (!cont->parent) {
-                /* This is early initialization for the top cgroup */
-                top_cpuset.mems_generation = cpuset_mems_generation++;
                 return &top_cpuset.css;
         }
         parent = cgroup_cs(cont->parent);
@@ -1799,7 +1786,6 @@ static struct cgroup_subsys_state *cpuset_create(
                 return ERR_PTR(-ENOMEM);
         }
 
-        cpuset_update_task_memory_state();
         cs->flags = 0;
         if (is_spread_page(parent))
                 set_bit(CS_SPREAD_PAGE, &cs->flags);
@@ -1808,7 +1794,6 @@ static struct cgroup_subsys_state *cpuset_create(
         set_bit(CS_SCHED_LOAD_BALANCE, &cs->flags);
         cpumask_clear(cs->cpus_allowed);
         nodes_clear(cs->mems_allowed);
-        cs->mems_generation = cpuset_mems_generation++;
         fmeter_init(&cs->fmeter);
         cs->relax_domain_level = -1;
 
@@ -1827,8 +1812,6 @@ static void cpuset_destroy(struct cgroup_subsys *ss, struct cgroup *cont)
 {
         struct cpuset *cs = cgroup_cs(cont);
 
-        cpuset_update_task_memory_state();
-
         if (is_sched_load_balance(cs))
                 update_flag(CS_SCHED_LOAD_BALANCE, cs, 0);
 
@@ -1849,21 +1832,6 @@ struct cgroup_subsys cpuset_subsys = {
         .early_init = 1,
 };
 
-/*
- * cpuset_init_early - just enough so that the calls to
- * cpuset_update_task_memory_state() in early init code
- * are harmless.
- */
-
-int __init cpuset_init_early(void)
-{
-        alloc_bootmem_cpumask_var(&top_cpuset.cpus_allowed);
-
-        top_cpuset.mems_generation = cpuset_mems_generation++;
-        return 0;
-}
-
-
 /**
  * cpuset_init - initialize cpusets at system boot
  *
@@ -1874,11 +1842,13 @@ int __init cpuset_init(void)
 {
         int err = 0;
 
+        if (!alloc_cpumask_var(&top_cpuset.cpus_allowed, GFP_KERNEL))
+                BUG();
+
         cpumask_setall(top_cpuset.cpus_allowed);
         nodes_setall(top_cpuset.mems_allowed);
 
         fmeter_init(&top_cpuset.fmeter);
-        top_cpuset.mems_generation = cpuset_mems_generation++;
         set_bit(CS_SCHED_LOAD_BALANCE, &top_cpuset.flags);
         top_cpuset.relax_domain_level = -1;
 
diff --git a/kernel/cred.c b/kernel/cred.c
index 3a039189d707..1bb4d7e5d616 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -167,7 +167,7 @@ EXPORT_SYMBOL(prepare_creds);
 
 /*
  * Prepare credentials for current to perform an execve()
- * - The caller must hold current->cred_exec_mutex
+ * - The caller must hold current->cred_guard_mutex
  */
 struct cred *prepare_exec_creds(void)
 {
@@ -276,7 +276,7 @@ int copy_creds(struct task_struct *p, unsigned long clone_flags)
         struct cred *new;
         int ret;
 
-        mutex_init(&p->cred_exec_mutex);
+        mutex_init(&p->cred_guard_mutex);
 
         if (
 #ifdef CONFIG_KEYS
diff --git a/kernel/exit.c b/kernel/exit.c
index abf9cf3b95c6..628d41f0dd54 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -48,7 +48,8 @@
 #include <linux/tracehook.h>
 #include <linux/fs_struct.h>
 #include <linux/init_task.h>
-#include <trace/sched.h>
+#include <linux/perf_counter.h>
+#include <trace/events/sched.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -56,10 +57,6 @@
 #include <asm/mmu_context.h>
 #include "cred-internals.h"
 
-DEFINE_TRACE(sched_process_free);
-DEFINE_TRACE(sched_process_exit);
-DEFINE_TRACE(sched_process_wait);
-
 static void exit_mm(struct task_struct * tsk);
 
 static void __unhash_process(struct task_struct *p)
@@ -158,6 +155,9 @@ static void delayed_put_task_struct(struct rcu_head *rhp)
 {
         struct task_struct *tsk = container_of(rhp, struct task_struct, rcu);
 
+#ifdef CONFIG_PERF_COUNTERS
+        WARN_ON_ONCE(tsk->perf_counter_ctxp);
+#endif
         trace_sched_process_free(tsk);
         put_task_struct(tsk);
 }
@@ -174,6 +174,7 @@ repeat:
         atomic_dec(&__task_cred(p)->user->processes);
 
         proc_flush_task(p);
+
         write_lock_irq(&tasklist_lock);
         tracehook_finish_release_task(p);
         __exit_signal(p);
@@ -374,9 +375,8 @@ static void set_special_pids(struct pid *pid)
 }
 
 /*
- * Let kernel threads use this to say that they
- * allow a certain signal (since daemonize() will
- * have disabled all of them by default).
+ * Let kernel threads use this to say that they allow a certain signal.
+ * Must not be used if kthread was cloned with CLONE_SIGHAND.
  */
 int allow_signal(int sig)
 {
@@ -384,14 +384,14 @@ int allow_signal(int sig)
                 return -EINVAL;
 
         spin_lock_irq(&current->sighand->siglock);
+        /* This is only needed for daemonize()'ed kthreads */
         sigdelset(&current->blocked, sig);
-        if (!current->mm) {
-                /* Kernel threads handle their own signals.
-                   Let the signal code know it'll be handled, so
-                   that they don't get converted to SIGKILL or
-                   just silently dropped */
-                current->sighand->action[(sig)-1].sa.sa_handler = (void __user *)2;
-        }
+        /*
+         * Kernel threads handle their own signals. Let the signal code
+         * know it'll be handled, so that they don't get converted to
+         * SIGKILL or just silently dropped.
+         */
+        current->sighand->action[(sig)-1].sa.sa_handler = (void __user *)2;
         recalc_sigpending();
         spin_unlock_irq(&current->sighand->siglock);
         return 0;
@@ -590,7 +590,7 @@ retry:
         /*
          * Search in the siblings
          */
-        list_for_each_entry(c, &p->parent->children, sibling) {
+        list_for_each_entry(c, &p->real_parent->children, sibling) {
                 if (c->mm == mm)
                         goto assign_new_owner;
         }
@@ -757,7 +757,7 @@ static void reparent_thread(struct task_struct *father, struct task_struct *p,
         p->exit_signal = SIGCHLD;
 
         /* If it has exited notify the new parent about this child's death. */
-        if (!p->ptrace &&
+        if (!task_ptrace(p) &&
             p->exit_state == EXIT_ZOMBIE && thread_group_empty(p)) {
                 do_notify_parent(p, p->exit_signal);
                 if (task_detached(p)) {
@@ -782,7 +782,7 @@ static void forget_original_parent(struct task_struct *father)
         list_for_each_entry_safe(p, n, &father->children, sibling) {
                 p->real_parent = reaper;
                 if (p->parent == father) {
-                        BUG_ON(p->ptrace);
+                        BUG_ON(task_ptrace(p));
                         p->parent = p->real_parent;
                 }
                 reparent_thread(father, p, &dead_children);
@@ -975,16 +975,19 @@ NORET_TYPE void do_exit(long code)
                 module_put(tsk->binfmt->module);
 
         proc_exit_connector(tsk);
+
+        /*
+         * Flush inherited counters to the parent - before the parent
+         * gets woken up by child-exit notifications.
+         */
+        perf_counter_exit_task(tsk);
+
         exit_notify(tsk, group_dead);
 #ifdef CONFIG_NUMA
         mpol_put(tsk->mempolicy);
         tsk->mempolicy = NULL;
 #endif
 #ifdef CONFIG_FUTEX
-        /*
-         * This must happen late, after the PID is not
-         * hashed anymore:
-         */
         if (unlikely(!list_empty(&tsk->pi_state_list)))
                 exit_pi_state_list(tsk);
         if (unlikely(current->pi_state_cache))
@@ -1077,6 +1080,18 @@ SYSCALL_DEFINE1(exit_group, int, error_code)
         return 0;
 }
 
+struct wait_opts {
+        enum pid_type           wo_type;
+        int                     wo_flags;
+        struct pid              *wo_pid;
+
+        struct siginfo __user   *wo_info;
+        int __user              *wo_stat;
+        struct rusage __user    *wo_rusage;
+
+        int                     notask_error;
+};
+
 static struct pid *task_pid_type(struct task_struct *task, enum pid_type type)
 {
         struct pid *pid = NULL;
@@ -1087,13 +1102,12 @@ static struct pid *task_pid_type(struct task_struct *task, enum pid_type type)
         return pid;
 }
 
-static int eligible_child(enum pid_type type, struct pid *pid, int options,
-                          struct task_struct *p)
+static int eligible_child(struct wait_opts *wo, struct task_struct *p)
 {
         int err;
 
-        if (type < PIDTYPE_MAX) {
-                if (task_pid_type(p, type) != pid)
+        if (wo->wo_type < PIDTYPE_MAX) {
+                if (task_pid_type(p, wo->wo_type) != wo->wo_pid)
                         return 0;
         }
 
@@ -1102,8 +1116,8 @@ static int eligible_child(enum pid_type type, struct pid *pid, int options,
          * set; otherwise, wait for non-clone children *only*.  (Note:
          * A "clone" child here is one that reports to its parent
          * using a signal other than SIGCHLD.) */
-        if (((p->exit_signal != SIGCHLD) ^ ((options & __WCLONE) != 0))
-            && !(options & __WALL))
+        if (((p->exit_signal != SIGCHLD) ^ !!(wo->wo_flags & __WCLONE))
+            && !(wo->wo_flags & __WALL))
                 return 0;
 
         err = security_task_wait(p);
@@ -1113,14 +1127,15 @@ static int eligible_child(enum pid_type type, struct pid *pid, int options,
         return 1;
 }
 
-static int wait_noreap_copyout(struct task_struct *p, pid_t pid, uid_t uid,
-                               int why, int status,
-                               struct siginfo __user *infop,
-                               struct rusage __user *rusagep)
+static int wait_noreap_copyout(struct wait_opts *wo, struct task_struct *p,
+                                pid_t pid, uid_t uid, int why, int status)
 {
-        int retval = rusagep ? getrusage(p, RUSAGE_BOTH, rusagep) : 0;
+        struct siginfo __user *infop;
+        int retval = wo->wo_rusage
+                ? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0;
 
         put_task_struct(p);
+        infop = wo->wo_info;
         if (!retval)
                 retval = put_user(SIGCHLD, &infop->si_signo);
         if (!retval)
@@ -1144,19 +1159,18 @@ static int wait_noreap_copyout(struct task_struct *p, pid_t pid, uid_t uid,
  * the lock and this task is uninteresting.  If we return nonzero, we have
  * released the lock and the system call should return.
  */
-static int wait_task_zombie(struct task_struct *p, int options,
-                            struct siginfo __user *infop,
-                            int __user *stat_addr, struct rusage __user *ru)
+static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
 {
         unsigned long state;
         int retval, status, traced;
         pid_t pid = task_pid_vnr(p);
         uid_t uid = __task_cred(p)->uid;
+        struct siginfo __user *infop;
 
-        if (!likely(options & WEXITED))
+        if (!likely(wo->wo_flags & WEXITED))
                 return 0;
 
-        if (unlikely(options & WNOWAIT)) {
+        if (unlikely(wo->wo_flags & WNOWAIT)) {
                 int exit_code = p->exit_code;
                 int why, status;
 
@@ -1169,8 +1183,7 @@ static int wait_task_zombie(struct task_struct *p, int options,
                         why = (exit_code & 0x80) ? CLD_DUMPED : CLD_KILLED;
                         status = exit_code & 0x7f;
                 }
-                return wait_noreap_copyout(p, pid, uid, why,
-                                           status, infop, ru);
+                return wait_noreap_copyout(wo, p, pid, uid, why, status);
         }
 
         /*
@@ -1184,11 +1197,13 @@ static int wait_task_zombie(struct task_struct *p, int options,
         }
 
         traced = ptrace_reparented(p);
-
-        if (likely(!traced)) {
+        /*
+         * It can be ptraced but not reparented, check
+         * !task_detached() to filter out sub-threads.
+         */
+        if (likely(!traced) && likely(!task_detached(p))) {
                 struct signal_struct *psig;
                 struct signal_struct *sig;
-                struct task_cputime cputime;
 
                 /*
                  * The resource counters for the group leader are in its
@@ -1201,26 +1216,23 @@ static int wait_task_zombie(struct task_struct *p, int options,
                  * p->signal fields, because they are only touched by
                  * __exit_signal, which runs with tasklist_lock
                  * write-locked anyway, and so is excluded here.  We do
-                 * need to protect the access to p->parent->signal fields,
+                 * need to protect the access to parent->signal fields,
                  * as other threads in the parent group can be right
                  * here reaping other children at the same time.
-                 *
-                 * We use thread_group_cputime() to get times for the thread
-                 * group, which consolidates times for all threads in the
-                 * group including the group leader.
                  */
-                thread_group_cputime(p, &cputime);
-                spin_lock_irq(&p->parent->sighand->siglock);
-                psig = p->parent->signal;
+                spin_lock_irq(&p->real_parent->sighand->siglock);
+                psig = p->real_parent->signal;
                 sig = p->signal;
                 psig->cutime =
                         cputime_add(psig->cutime,
-                        cputime_add(cputime.utime,
-                                    sig->cutime));
+                        cputime_add(p->utime,
+                        cputime_add(sig->utime,
+                                    sig->cutime)));
                 psig->cstime =
                         cputime_add(psig->cstime,
-                        cputime_add(cputime.stime,
-                                    sig->cstime));
+                        cputime_add(p->stime,
+                        cputime_add(sig->stime,
+                                    sig->cstime)));
                 psig->cgtime =
                         cputime_add(psig->cgtime,
                         cputime_add(p->gtime,
@@ -1242,7 +1254,7 @@ static int wait_task_zombie(struct task_struct *p, int options,
                         sig->oublock + sig->coublock;
                 task_io_accounting_add(&psig->ioac, &p->ioac);
                 task_io_accounting_add(&psig->ioac, &sig->ioac);
-                spin_unlock_irq(&p->parent->sighand->siglock);
+                spin_unlock_irq(&p->real_parent->sighand->siglock);
         }
 
         /*
@@ -1251,11 +1263,14 @@ static int wait_task_zombie(struct task_struct *p, int options,
          */
         read_unlock(&tasklist_lock);
 
-        retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
+        retval = wo->wo_rusage
+                ? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0;
         status = (p->signal->flags & SIGNAL_GROUP_EXIT)
                 ? p->signal->group_exit_code : p->exit_code;
-        if (!retval && stat_addr)
-                retval = put_user(status, stat_addr);
+        if (!retval && wo->wo_stat)
+                retval = put_user(status, wo->wo_stat);
+
+        infop = wo->wo_info;
         if (!retval && infop)
                 retval = put_user(SIGCHLD, &infop->si_signo);
         if (!retval && infop)
@@ -1323,15 +1338,18 @@ static int *task_stopped_code(struct task_struct *p, bool ptrace)
  * the lock and this task is uninteresting.  If we return nonzero, we have
  * released the lock and the system call should return.
  */
-static int wait_task_stopped(int ptrace, struct task_struct *p,
-                             int options, struct siginfo __user *infop,
-                             int __user *stat_addr, struct rusage __user *ru)
+static int wait_task_stopped(struct wait_opts *wo,
+                                int ptrace, struct task_struct *p)
 {
+        struct siginfo __user *infop;
         int retval, exit_code, *p_code, why;
         uid_t uid = 0; /* unneeded, required by compiler */
         pid_t pid;
 
-        if (!(options & WUNTRACED))
+        /*
+         * Traditionally we see ptrace'd stopped tasks regardless of options.
+         */
+        if (!ptrace && !(wo->wo_flags & WUNTRACED))
                 return 0;
 
         exit_code = 0;
@@ -1345,7 +1363,7 @@ static int wait_task_stopped(int ptrace, struct task_struct *p,
         if (!exit_code)
                 goto unlock_sig;
 
-        if (!unlikely(options & WNOWAIT))
+        if (!unlikely(wo->wo_flags & WNOWAIT))
                 *p_code = 0;
 
         /* don't need the RCU readlock here as we're holding a spinlock */
@@ -1367,14 +1385,15 @@ unlock_sig:
         why = ptrace ? CLD_TRAPPED : CLD_STOPPED;
         read_unlock(&tasklist_lock);
 
-        if (unlikely(options & WNOWAIT))
-                return wait_noreap_copyout(p, pid, uid,
-                                           why, exit_code,
-                                           infop, ru);
+        if (unlikely(wo->wo_flags & WNOWAIT))
+                return wait_noreap_copyout(wo, p, pid, uid, why, exit_code);
+
+        retval = wo->wo_rusage
+                ? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0;
+        if (!retval && wo->wo_stat)
+                retval = put_user((exit_code << 8) | 0x7f, wo->wo_stat);
 
-        retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
-        if (!retval && stat_addr)
-                retval = put_user((exit_code << 8) | 0x7f, stat_addr);
+        infop = wo->wo_info;
         if (!retval && infop)
                 retval = put_user(SIGCHLD, &infop->si_signo);
         if (!retval && infop)
@@ -1401,15 +1420,13 @@ unlock_sig:
  * the lock and this task is uninteresting.  If we return nonzero, we have
  * released the lock and the system call should return.
  */
-static int wait_task_continued(struct task_struct *p, int options,
-                               struct siginfo __user *infop,
-                               int __user *stat_addr, struct rusage __user *ru)
+static int wait_task_continued(struct wait_opts *wo, struct task_struct *p)
 {
         int retval;
         pid_t pid;
         uid_t uid;
 
-        if (!unlikely(options & WCONTINUED))
+        if (!unlikely(wo->wo_flags & WCONTINUED))
                 return 0;
 
         if (!(p->signal->flags & SIGNAL_STOP_CONTINUED))
@@ -1421,7 +1438,7 @@ static int wait_task_continued(struct task_struct *p, int options,
                 spin_unlock_irq(&p->sighand->siglock);
                 return 0;
         }
-        if (!unlikely(options & WNOWAIT))
+        if (!unlikely(wo->wo_flags & WNOWAIT))
                 p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
         uid = __task_cred(p)->uid;
         spin_unlock_irq(&p->sighand->siglock);
@@ -1430,17 +1447,17 @@ static int wait_task_continued(struct task_struct *p, int options,
         get_task_struct(p);
         read_unlock(&tasklist_lock);
 
-        if (!infop) {
-                retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
+        if (!wo->wo_info) {
+                retval = wo->wo_rusage
+                        ? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0;
                 put_task_struct(p);
-                if (!retval && stat_addr)
-                        retval = put_user(0xffff, stat_addr);
+                if (!retval && wo->wo_stat)
+                        retval = put_user(0xffff, wo->wo_stat);
                 if (!retval)
                         retval = pid;
         } else {
-                retval = wait_noreap_copyout(p, pid, uid,
-                                             CLD_CONTINUED, SIGCONT,
-                                             infop, ru);
+                retval = wait_noreap_copyout(wo, p, pid, uid,
+                                             CLD_CONTINUED, SIGCONT);
                 BUG_ON(retval == 0);
         }
 
@@ -1450,19 +1467,16 @@ static int wait_task_continued(struct task_struct *p, int options,
 /*
  * Consider @p for a wait by @parent.
  *
- * -ECHILD should be in *@notask_error before the first call.
+ * -ECHILD should be in ->notask_error before the first call.
  * Returns nonzero for a final return, when we have unlocked tasklist_lock.
  * Returns zero if the search for a child should continue;
- * then *@notask_error is 0 if @p is an eligible child,
+ * then ->notask_error is 0 if @p is an eligible child,
  * or another error from security_task_wait(), or still -ECHILD.
  */
-static int wait_consider_task(struct task_struct *parent, int ptrace,
-                              struct task_struct *p, int *notask_error,
-                              enum pid_type type, struct pid *pid, int options,
-                              struct siginfo __user *infop,
-                              int __user *stat_addr, struct rusage __user *ru)
+static int wait_consider_task(struct wait_opts *wo, struct task_struct *parent,
+                                int ptrace, struct task_struct *p)
 {
-        int ret = eligible_child(type, pid, options, p);
+        int ret = eligible_child(wo, p);
         if (!ret)
                 return ret;
 
@@ -1474,16 +1488,17 @@ static int wait_consider_task(struct task_struct *parent, int ptrace,
                  * to look for security policy problems, rather
                  * than for mysterious wait bugs.
                  */
-                if (*notask_error)
-                        *notask_error = ret;
+                if (wo->notask_error)
+                        wo->notask_error = ret;
+                return 0;
         }
 
-        if (likely(!ptrace) && unlikely(p->ptrace)) {
+        if (likely(!ptrace) && unlikely(task_ptrace(p))) {
                 /*
                  * This child is hidden by ptrace.
                  * We aren't allowed to see it now, but eventually we will.
                  */
-                *notask_error = 0;
+                wo->notask_error = 0;
                 return 0;
         }
 
@@ -1494,34 +1509,30 @@ static int wait_consider_task(struct task_struct *parent, int ptrace,
          * We don't reap group leaders with subthreads.
          */
         if (p->exit_state == EXIT_ZOMBIE && !delay_group_leader(p))
-                return wait_task_zombie(p, options, infop, stat_addr, ru);
+                return wait_task_zombie(wo, p);
 
         /*
          * It's stopped or running now, so it might
          * later continue, exit, or stop again.
          */
-        *notask_error = 0;
+        wo->notask_error = 0;
 
         if (task_stopped_code(p, ptrace))
-                return wait_task_stopped(ptrace, p, options,
-                                         infop, stat_addr, ru);
+                return wait_task_stopped(wo, ptrace, p);
 
-        return wait_task_continued(p, options, infop, stat_addr, ru);
+        return wait_task_continued(wo, p);
 }
 
 /*
  * Do the work of do_wait() for one thread in the group, @tsk.
  *
- * -ECHILD should be in *@notask_error before the first call.
+ * -ECHILD should be in ->notask_error before the first call.
  * Returns nonzero for a final return, when we have unlocked tasklist_lock.
  * Returns zero if the search for a child should continue; then
- * *@notask_error is 0 if there were any eligible children,
+ * ->notask_error is 0 if there were any eligible children,
  * or another error from security_task_wait(), or still -ECHILD.
  */
-static int do_wait_thread(struct task_struct *tsk, int *notask_error,
-                          enum pid_type type, struct pid *pid, int options,
-                          struct siginfo __user *infop, int __user *stat_addr,
-                          struct rusage __user *ru)
+static int do_wait_thread(struct wait_opts *wo, struct task_struct *tsk)
 {
         struct task_struct *p;
 
@@ -1530,9 +1541,7 @@ static int do_wait_thread(struct task_struct *tsk, int *notask_error,
                  * Do not consider detached threads.
                  */
                 if (!task_detached(p)) {
-                        int ret = wait_consider_task(tsk, 0, p, notask_error,
-                                                     type, pid, options,
-                                                     infop, stat_addr, ru);
+                        int ret = wait_consider_task(wo, tsk, 0, p);
                         if (ret)
                                 return ret;
                 }
@@ -1541,22 +1550,12 @@ static int do_wait_thread(struct task_struct *tsk, int *notask_error,
         return 0;
 }
 
-static int ptrace_do_wait(struct task_struct *tsk, int *notask_error,
-                          enum pid_type type, struct pid *pid, int options,
-                          struct siginfo __user *infop, int __user *stat_addr,
-                          struct rusage __user *ru)
+static int ptrace_do_wait(struct wait_opts *wo, struct task_struct *tsk)
 {
         struct task_struct *p;
 
-        /*
-         * Traditionally we see ptrace'd stopped tasks regardless of options.
-         */
-        options |= WUNTRACED;
-
         list_for_each_entry(p, &tsk->ptraced, ptrace_entry) {
-                int ret = wait_consider_task(tsk, 1, p, notask_error,
-                                             type, pid, options,
-                                             infop, stat_addr, ru);
+                int ret = wait_consider_task(wo, tsk, 1, p);
                 if (ret)
                         return ret;
         }
@@ -1564,65 +1563,59 @@ static int ptrace_do_wait(struct task_struct *tsk, int *notask_error,
         return 0;
 }
 
-static long do_wait(enum pid_type type, struct pid *pid, int options,
-                    struct siginfo __user *infop, int __user *stat_addr,
-                    struct rusage __user *ru)
+static long do_wait(struct wait_opts *wo)
 {
         DECLARE_WAITQUEUE(wait, current);
         struct task_struct *tsk;
         int retval;
 
-        trace_sched_process_wait(pid);
+        trace_sched_process_wait(wo->wo_pid);
 
         add_wait_queue(&current->signal->wait_chldexit,&wait);
 repeat:
         /*
          * If there is nothing that can match our critiera just get out.
-         * We will clear @retval to zero if we see any child that might later
-         * match our criteria, even if we are not able to reap it yet.
+         * We will clear ->notask_error to zero if we see any child that
+         * might later match our criteria, even if we are not able to reap
+         * it yet.
          */
-        retval = -ECHILD;
-        if ((type < PIDTYPE_MAX) && (!pid || hlist_empty(&pid->tasks[type])))
-                goto end;
+        wo->notask_error = -ECHILD;
+        if ((wo->wo_type < PIDTYPE_MAX) &&
+           (!wo->wo_pid || hlist_empty(&wo->wo_pid->tasks[wo->wo_type])))
+                goto notask;
 
-        current->state = TASK_INTERRUPTIBLE;
+        set_current_state(TASK_INTERRUPTIBLE);
         read_lock(&tasklist_lock);
         tsk = current;
         do {
-                int tsk_result = do_wait_thread(tsk, &retval,
-                                                type, pid, options,
-                                                infop, stat_addr, ru);
-                if (!tsk_result)
-                        tsk_result = ptrace_do_wait(tsk, &retval,
-                                                    type, pid, options,
-                                                    infop, stat_addr, ru);
-                if (tsk_result) {
-                        /*
-                         * tasklist_lock is unlocked and we have a final result.
-                         */
-                        retval = tsk_result;
+                retval = do_wait_thread(wo, tsk);
+                if (retval)
                         goto end;
-                }
 
-                if (options & __WNOTHREAD)
+                retval = ptrace_do_wait(wo, tsk);
+                if (retval)
+                        goto end;
+
+                if (wo->wo_flags & __WNOTHREAD)
                         break;
-                tsk = next_thread(tsk);
-                BUG_ON(tsk->signal != current->signal);
-        } while (tsk != current);
+        } while_each_thread(current, tsk);
         read_unlock(&tasklist_lock);
 
-        if (!retval && !(options & WNOHANG)) {
+notask:
+        retval = wo->notask_error;
+        if (!retval && !(wo->wo_flags & WNOHANG)) {
                 retval = -ERESTARTSYS;
                 if (!signal_pending(current)) {
                         schedule();
                         goto repeat;
                 }
         }
-
 end:
-        current->state = TASK_RUNNING;
+        __set_current_state(TASK_RUNNING);
         remove_wait_queue(&current->signal->wait_chldexit,&wait);
-        if (infop) {
+        if (wo->wo_info) {
+                struct siginfo __user *infop = wo->wo_info;
+
                 if (retval > 0)
                         retval = 0;
                 else {
@@ -1651,6 +1644,7 @@ end:
 SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *,
                 infop, int, options, struct rusage __user *, ru)
 {
+        struct wait_opts wo;
         struct pid *pid = NULL;
         enum pid_type type;
         long ret;
@@ -1680,7 +1674,14 @@ SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *,
 
         if (type < PIDTYPE_MAX)
                 pid = find_get_pid(upid);
-        ret = do_wait(type, pid, options, infop, NULL, ru);
+
+        wo.wo_type      = type;
+        wo.wo_pid       = pid;
+        wo.wo_flags     = options;
+        wo.wo_info      = infop;
+        wo.wo_stat      = NULL;
+        wo.wo_rusage    = ru;
+        ret = do_wait(&wo);
         put_pid(pid);
 
         /* avoid REGPARM breakage on x86: */
@@ -1691,6 +1692,7 @@ SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *,
 SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr,
                 int, options, struct rusage __user *, ru)
 {
+        struct wait_opts wo;
         struct pid *pid = NULL;
         enum pid_type type;
         long ret;
@@ -1712,7 +1714,13 @@ SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr,
                 pid = find_get_pid(upid);
         }
 
-        ret = do_wait(type, pid, options | WEXITED, NULL, stat_addr, ru);
+        wo.wo_type      = type;
+        wo.wo_pid       = pid;
+        wo.wo_flags     = options | WEXITED;
+        wo.wo_info      = NULL;
+        wo.wo_stat      = stat_addr;
+        wo.wo_rusage    = ru;
+        ret = do_wait(&wo);
         put_pid(pid);
 
         /* avoid REGPARM breakage on x86: */
diff --git a/kernel/fork.c b/kernel/fork.c
index b9e2edd00726..467746b3f0aa 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -61,8 +61,8 @@
 #include <linux/proc_fs.h>
 #include <linux/blkdev.h>
 #include <linux/fs_struct.h>
-#include <trace/sched.h>
 #include <linux/magic.h>
+#include <linux/perf_counter.h>
 
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
@@ -71,6 +71,8 @@
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 
+#include <trace/events/sched.h>
+
 /*
  * Protected counters by write_lock_irq(&tasklist_lock)
  */
@@ -83,8 +85,6 @@ DEFINE_PER_CPU(unsigned long, process_counts) = 0;
 
 __cacheline_aligned DEFINE_RWLOCK(tasklist_lock);  /* outer */
 
-DEFINE_TRACE(sched_process_fork);
-
 int nr_processes(void)
 {
         int cpu;
@@ -178,7 +178,7 @@ void __init fork_init(unsigned long mempages)
         /* create a slab on which task_structs can be allocated */
         task_struct_cachep =
                 kmem_cache_create("task_struct", sizeof(struct task_struct),
-                        ARCH_MIN_TASKALIGN, SLAB_PANIC, NULL);
+                        ARCH_MIN_TASKALIGN, SLAB_PANIC | SLAB_NOTRACK, NULL);
 #endif
 
         /* do the arch specific task caches init */
@@ -982,6 +982,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         if (!p)
                 goto fork_out;
 
+        ftrace_graph_init_task(p);
+
         rt_mutex_init_task(p);
 
 #ifdef CONFIG_PROVE_LOCKING
@@ -1027,7 +1029,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         p->vfork_done = NULL;
         spin_lock_init(&p->alloc_lock);
 
-        clear_tsk_thread_flag(p, TIF_SIGPENDING);
         init_sigpending(&p->pending);
 
         p->utime = cputime_zero;
@@ -1089,12 +1090,16 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #ifdef CONFIG_DEBUG_MUTEXES
         p->blocked_on = NULL; /* not blocked yet */
 #endif
-        if (unlikely(current->ptrace))
-                ptrace_fork(p, clone_flags);
+
+        p->bts = NULL;
 
         /* Perform scheduler related setup. Assign this task to a CPU. */
         sched_fork(p, clone_flags);
 
+        retval = perf_counter_init_task(p);
+        if (retval)
+                goto bad_fork_cleanup_policy;
+
         if ((retval = audit_alloc(p)))
                 goto bad_fork_cleanup_policy;
         /* copy all the process information */
@@ -1131,8 +1136,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 }
         }
 
-        ftrace_graph_init_task(p);
-
         p->pid = pid_nr(pid);
         p->tgid = p->pid;
         if (clone_flags & CLONE_THREAD)
@@ -1141,7 +1144,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         if (current->nsproxy != p->nsproxy) {
                 retval = ns_cgroup_clone(p, pid);
                 if (retval)
-                        goto bad_fork_free_graph;
+                        goto bad_fork_free_pid;
         }
 
         p->set_child_tid = (clone_flags & CLONE_CHILD_SETTID) ? child_tidptr : NULL;
@@ -1233,7 +1236,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 spin_unlock(&current->sighand->siglock);
                 write_unlock_irq(&tasklist_lock);
                 retval = -ERESTARTNOINTR;
-                goto bad_fork_free_graph;
+                goto bad_fork_free_pid;
         }
 
         if (clone_flags & CLONE_THREAD) {
@@ -1268,8 +1271,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         cgroup_post_fork(p);
         return p;
 
-bad_fork_free_graph:
-        ftrace_graph_exit_task(p);
 bad_fork_free_pid:
         if (pid != &init_struct_pid)
                 free_pid(pid);
@@ -1293,6 +1294,7 @@ bad_fork_cleanup_semundo:
 bad_fork_cleanup_audit:
         audit_free(p);
 bad_fork_cleanup_policy:
+        perf_counter_free_task(p);
 #ifdef CONFIG_NUMA
         mpol_put(p->mempolicy);
 bad_fork_cleanup_cgroup:
@@ -1406,10 +1408,16 @@ long do_fork(unsigned long clone_flags,
                 if (clone_flags & CLONE_VFORK) {
                         p->vfork_done = &vfork;
                         init_completion(&vfork);
+                } else if (!(clone_flags & CLONE_VM)) {
+                        /*
+                         * vfork will do an exec which will call
+                         * set_task_comm()
+                         */
+                        perf_counter_fork(p);
                 }
 
                 audit_finish_fork(p);
-                tracehook_report_clone(trace, regs, clone_flags, nr, p);
+                tracehook_report_clone(regs, clone_flags, nr, p);
 
                 /*
                  * We set PF_STARTING at creation in case tracing wants to
@@ -1461,20 +1469,20 @@ void __init proc_caches_init(void)
 {
         sighand_cachep = kmem_cache_create("sighand_cache",
                         sizeof(struct sighand_struct), 0,
-                        SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_DESTROY_BY_RCU,
-                        sighand_ctor);
+                        SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_DESTROY_BY_RCU|
+                        SLAB_NOTRACK, sighand_ctor);
         signal_cachep = kmem_cache_create("signal_cache",
                         sizeof(struct signal_struct), 0,
-                        SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+                        SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK, NULL);
         files_cachep = kmem_cache_create("files_cache",
                         sizeof(struct files_struct), 0,
-                        SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+                        SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK, NULL);
         fs_cachep = kmem_cache_create("fs_cache",
                         sizeof(struct fs_struct), 0,
-                        SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+                        SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK, NULL);
         mm_cachep = kmem_cache_create("mm_struct",
                         sizeof(struct mm_struct), ARCH_MIN_MMSTRUCT_ALIGN,
-                        SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+                        SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK, NULL);
         vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC);
         mmap_init();
 }
diff --git a/kernel/futex.c b/kernel/futex.c
index eef8cd26b5e5..80b5ce716596 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -19,6 +19,10 @@
  *  PRIVATE futexes by Eric Dumazet
  *  Copyright (C) 2007 Eric Dumazet <dada1@cosmosbay.com>
  *
+ *  Requeue-PI support by Darren Hart <dvhltc@us.ibm.com>
+ *  Copyright (C) IBM Corporation, 2009
+ *  Thanks to Thomas Gleixner for conceptual design and careful reviews.
+ *
  *  Thanks to Ben LaHaise for yelling "hashed waitqueues" loudly
  *  enough at me, Linus for the original (flawed) idea, Matthew
  *  Kirkwood for proof-of-concept implementation.
@@ -96,8 +100,8 @@ struct futex_pi_state {
  */
 struct futex_q {
         struct plist_node list;
-        /* There can only be a single waiter */
-        wait_queue_head_t waiter;
+        /* Waiter reference */
+        struct task_struct *task;
 
         /* Which hash list lock to use: */
         spinlock_t *lock_ptr;
@@ -107,7 +111,9 @@ struct futex_q {
 
         /* Optional priority inheritance state: */
         struct futex_pi_state *pi_state;
-        struct task_struct *task;
+
+        /* rt_waiter storage for requeue_pi: */
+        struct rt_mutex_waiter *rt_waiter;
 
         /* Bitset for the optional bitmasked wakeup */
         u32 bitset;
@@ -193,6 +199,7 @@ static void drop_futex_key_refs(union futex_key *key)
  * @uaddr: virtual address of the futex
  * @fshared: 0 for a PROCESS_PRIVATE futex, 1 for PROCESS_SHARED
  * @key: address where result is stored.
+ * @rw: mapping needs to be read/write (values: VERIFY_READ, VERIFY_WRITE)
  *
  * Returns a negative error code or 0
  * The key words are stored in *key on success.
@@ -203,7 +210,8 @@ static void drop_futex_key_refs(union futex_key *key)
  *
  * lock_page() might sleep, the caller should not hold a spinlock.
  */
-static int get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key)
+static int
+get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, int rw)
 {
         unsigned long address = (unsigned long)uaddr;
         struct mm_struct *mm = current->mm;
@@ -226,7 +234,7 @@ static int get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key)
          *        but access_ok() should be faster than find_vma()
          */
         if (!fshared) {
-                if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))))
+                if (unlikely(!access_ok(rw, uaddr, sizeof(u32))))
                         return -EFAULT;
                 key->private.mm = mm;
                 key->private.address = address;
@@ -235,7 +243,7 @@ static int get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key)
         }
 
 again:
-        err = get_user_pages_fast(address, 1, 0, &page);
+        err = get_user_pages_fast(address, 1, rw == VERIFY_WRITE, &page);
         if (err < 0)
                 return err;
 
@@ -276,6 +284,25 @@ void put_futex_key(int fshared, union futex_key *key)
         drop_futex_key_refs(key);
 }
 
+/**
+ * futex_top_waiter() - Return the highest priority waiter on a futex
+ * @hb:     the hash bucket the futex_q's reside in
+ * @key:    the futex key (to distinguish it from other futex futex_q's)
+ *
+ * Must be called with the hb lock held.
+ */
+static struct futex_q *futex_top_waiter(struct futex_hash_bucket *hb,
+                                        union futex_key *key)
+{
+        struct futex_q *this;
+
+        plist_for_each_entry(this, &hb->chain, list) {
+                if (match_futex(&this->key, key))
+                        return this;
+        }
+        return NULL;
+}
+
 static u32 cmpxchg_futex_value_locked(u32 __user *uaddr, u32 uval, u32 newval)
 {
         u32 curval;
@@ -537,28 +564,160 @@ lookup_pi_state(u32 uval, struct futex_hash_bucket *hb,
         return 0;
 }
 
+/**
+ * futex_lock_pi_atomic() - atomic work required to acquire a pi aware futex
+ * @uaddr:              the pi futex user address
+ * @hb:                 the pi futex hash bucket
+ * @key:                the futex key associated with uaddr and hb
+ * @ps:                 the pi_state pointer where we store the result of the
+ *                      lookup
+ * @task:               the task to perform the atomic lock work for.  This will
+ *                      be "current" except in the case of requeue pi.
+ * @set_waiters:        force setting the FUTEX_WAITERS bit (1) or not (0)
+ *
+ * Returns:
+ *  0 - ready to wait
+ *  1 - acquired the lock
+ * <0 - error
+ *
+ * The hb->lock and futex_key refs shall be held by the caller.
+ */
+static int futex_lock_pi_atomic(u32 __user *uaddr, struct futex_hash_bucket *hb,
+                                union futex_key *key,
+                                struct futex_pi_state **ps,
+                                struct task_struct *task, int set_waiters)
+{
+        int lock_taken, ret, ownerdied = 0;
+        u32 uval, newval, curval;
+
+retry:
+        ret = lock_taken = 0;
+
+        /*
+         * To avoid races, we attempt to take the lock here again
+         * (by doing a 0 -> TID atomic cmpxchg), while holding all
+         * the locks. It will most likely not succeed.
+         */
+        newval = task_pid_vnr(task);
+        if (set_waiters)
+                newval |= FUTEX_WAITERS;
+
+        curval = cmpxchg_futex_value_locked(uaddr, 0, newval);
+
+        if (unlikely(curval == -EFAULT))
+                return -EFAULT;
+
+        /*
+         * Detect deadlocks.
+         */
+        if ((unlikely((curval & FUTEX_TID_MASK) == task_pid_vnr(task))))
+                return -EDEADLK;
+
+        /*
+         * Surprise - we got the lock. Just return to userspace:
+         */
+        if (unlikely(!curval))
+                return 1;
+
+        uval = curval;
+
+        /*
+         * Set the FUTEX_WAITERS flag, so the owner will know it has someone
+         * to wake at the next unlock.
+         */
+        newval = curval | FUTEX_WAITERS;
+
+        /*
+         * There are two cases, where a futex might have no owner (the
+         * owner TID is 0): OWNER_DIED. We take over the futex in this
+         * case. We also do an unconditional take over, when the owner
+         * of the futex died.
+         *
+         * This is safe as we are protected by the hash bucket lock !
+         */
+        if (unlikely(ownerdied || !(curval & FUTEX_TID_MASK))) {
+                /* Keep the OWNER_DIED bit */
+                newval = (curval & ~FUTEX_TID_MASK) | task_pid_vnr(task);
+                ownerdied = 0;
+                lock_taken = 1;
+        }
+
+        curval = cmpxchg_futex_value_locked(uaddr, uval, newval);
+
+        if (unlikely(curval == -EFAULT))
+                return -EFAULT;
+        if (unlikely(curval != uval))
+                goto retry;
+
+        /*
+         * We took the lock due to owner died take over.
+         */
+        if (unlikely(lock_taken))
+                return 1;
+
+        /*
+         * We dont have the lock. Look up the PI state (or create it if
+         * we are the first waiter):
+         */
+        ret = lookup_pi_state(uval, hb, key, ps);
+
+        if (unlikely(ret)) {
+                switch (ret) {
+                case -ESRCH:
+                        /*
+                         * No owner found for this futex. Check if the
+                         * OWNER_DIED bit is set to figure out whether
+                         * this is a robust futex or not.
+                         */
+                        if (get_futex_value_locked(&curval, uaddr))
+                                return -EFAULT;
+
+                        /*
+                         * We simply start over in case of a robust
+                         * futex. The code above will take the futex
+                         * and return happy.
+                         */
+                        if (curval & FUTEX_OWNER_DIED) {
+                                ownerdied = 1;
+                                goto retry;
+                        }
+                default:
+                        break;
+                }
+        }
+
+        return ret;
+}
+
 /*
  * The hash bucket lock must be held when this is called.
  * Afterwards, the futex_q must not be accessed.
  */
 static void wake_futex(struct futex_q *q)
 {
-        plist_del(&q->list, &q->list.plist);
+        struct task_struct *p = q->task;
+
         /*
-         * The lock in wake_up_all() is a crucial memory barrier after the
-         * plist_del() and also before assigning to q->lock_ptr.
+         * We set q->lock_ptr = NULL _before_ we wake up the task. If
+         * a non futex wake up happens on another CPU then the task
+         * might exit and p would dereference a non existing task
+         * struct. Prevent this by holding a reference on p across the
+         * wake up.
          */
-        wake_up(&q->waiter);
+        get_task_struct(p);
+
+        plist_del(&q->list, &q->list.plist);
         /*
-         * The waiting task can free the futex_q as soon as this is written,
-         * without taking any locks.  This must come last.
-         *
-         * A memory barrier is required here to prevent the following store to
-         * lock_ptr from getting ahead of the wakeup. Clearing the lock at the
-         * end of wake_up() does not prevent this store from moving.
+         * The waiting task can free the futex_q as soon as
+         * q->lock_ptr = NULL is written, without taking any locks. A
+         * memory barrier is required here to prevent the following
+         * store to lock_ptr from getting ahead of the plist_del.
          */
         smp_wmb();
         q->lock_ptr = NULL;
+
+        wake_up_state(p, TASK_NORMAL);
+        put_task_struct(p);
 }
 
 static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this)
@@ -677,7 +836,7 @@ static int futex_wake(u32 __user *uaddr, int fshared, int nr_wake, u32 bitset)
         if (!bitset)
                 return -EINVAL;
 
-        ret = get_futex_key(uaddr, fshared, &key);
+        ret = get_futex_key(uaddr, fshared, &key, VERIFY_READ);
         if (unlikely(ret != 0))
                 goto out;
 
@@ -687,7 +846,7 @@ static int futex_wake(u32 __user *uaddr, int fshared, int nr_wake, u32 bitset)
 
         plist_for_each_entry_safe(this, next, head, list) {
                 if (match_futex (&this->key, &key)) {
-                        if (this->pi_state) {
+                        if (this->pi_state || this->rt_waiter) {
                                 ret = -EINVAL;
                                 break;
                         }
@@ -723,10 +882,10 @@ futex_wake_op(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
         int ret, op_ret;
 
 retry:
-        ret = get_futex_key(uaddr1, fshared, &key1);
+        ret = get_futex_key(uaddr1, fshared, &key1, VERIFY_READ);
         if (unlikely(ret != 0))
                 goto out;
-        ret = get_futex_key(uaddr2, fshared, &key2);
+        ret = get_futex_key(uaddr2, fshared, &key2, VERIFY_WRITE);
         if (unlikely(ret != 0))
                 goto out_put_key1;
 
@@ -800,24 +959,185 @@ out:
         return ret;
 }
 
-/*
- * Requeue all waiters hashed on one physical page to another
- * physical page.
+/**
+ * requeue_futex() - Requeue a futex_q from one hb to another
+ * @q:          the futex_q to requeue
+ * @hb1:        the source hash_bucket
+ * @hb2:        the target hash_bucket
+ * @key2:       the new key for the requeued futex_q
+ */
+static inline
+void requeue_futex(struct futex_q *q, struct futex_hash_bucket *hb1,
+                   struct futex_hash_bucket *hb2, union futex_key *key2)
+{
+
+        /*
+         * If key1 and key2 hash to the same bucket, no need to
+         * requeue.
+         */
+        if (likely(&hb1->chain != &hb2->chain)) {
+                plist_del(&q->list, &hb1->chain);
+                plist_add(&q->list, &hb2->chain);
+                q->lock_ptr = &hb2->lock;
+#ifdef CONFIG_DEBUG_PI_LIST
+                q->list.plist.lock = &hb2->lock;
+#endif
+        }
+        get_futex_key_refs(key2);
+        q->key = *key2;
+}
+
+/**
+ * requeue_pi_wake_futex() - Wake a task that acquired the lock during requeue
+ * q:   the futex_q
+ * key: the key of the requeue target futex
+ *
+ * During futex_requeue, with requeue_pi=1, it is possible to acquire the
+ * target futex if it is uncontended or via a lock steal.  Set the futex_q key
+ * to the requeue target futex so the waiter can detect the wakeup on the right
+ * futex, but remove it from the hb and NULL the rt_waiter so it can detect
+ * atomic lock acquisition.  Must be called with the q->lock_ptr held.
+ */
+static inline
+void requeue_pi_wake_futex(struct futex_q *q, union futex_key *key)
+{
+        drop_futex_key_refs(&q->key);
+        get_futex_key_refs(key);
+        q->key = *key;
+
+        WARN_ON(plist_node_empty(&q->list));
+        plist_del(&q->list, &q->list.plist);
+
+        WARN_ON(!q->rt_waiter);
+        q->rt_waiter = NULL;
+
+        wake_up_state(q->task, TASK_NORMAL);
+}
+
+/**
+ * futex_proxy_trylock_atomic() - Attempt an atomic lock for the top waiter
+ * @pifutex:            the user address of the to futex
+ * @hb1:                the from futex hash bucket, must be locked by the caller
+ * @hb2:                the to futex hash bucket, must be locked by the caller
+ * @key1:               the from futex key
+ * @key2:               the to futex key
+ * @ps:                 address to store the pi_state pointer
+ * @set_waiters:        force setting the FUTEX_WAITERS bit (1) or not (0)
+ *
+ * Try and get the lock on behalf of the top waiter if we can do it atomically.
+ * Wake the top waiter if we succeed.  If the caller specified set_waiters,
+ * then direct futex_lock_pi_atomic() to force setting the FUTEX_WAITERS bit.
+ * hb1 and hb2 must be held by the caller.
+ *
+ * Returns:
+ *  0 - failed to acquire the lock atomicly
+ *  1 - acquired the lock
+ * <0 - error
+ */
+static int futex_proxy_trylock_atomic(u32 __user *pifutex,
+                                 struct futex_hash_bucket *hb1,
+                                 struct futex_hash_bucket *hb2,
+                                 union futex_key *key1, union futex_key *key2,
+                                 struct futex_pi_state **ps, int set_waiters)
+{
+        struct futex_q *top_waiter = NULL;
+        u32 curval;
+        int ret;
+
+        if (get_futex_value_locked(&curval, pifutex))
+                return -EFAULT;
+
+        /*
+         * Find the top_waiter and determine if there are additional waiters.
+         * If the caller intends to requeue more than 1 waiter to pifutex,
+         * force futex_lock_pi_atomic() to set the FUTEX_WAITERS bit now,
+         * as we have means to handle the possible fault.  If not, don't set
+         * the bit unecessarily as it will force the subsequent unlock to enter
+         * the kernel.
+         */
+        top_waiter = futex_top_waiter(hb1, key1);
+
+        /* There are no waiters, nothing for us to do. */
+        if (!top_waiter)
+                return 0;
+
+        /*
+         * Try to take the lock for top_waiter.  Set the FUTEX_WAITERS bit in
+         * the contended case or if set_waiters is 1.  The pi_state is returned
+         * in ps in contended cases.
+         */
+        ret = futex_lock_pi_atomic(pifutex, hb2, key2, ps, top_waiter->task,
+                                   set_waiters);
+        if (ret == 1)
+                requeue_pi_wake_futex(top_waiter, key2);
+
+        return ret;
+}
+
+/**
+ * futex_requeue() - Requeue waiters from uaddr1 to uaddr2
+ * uaddr1:      source futex user address
+ * uaddr2:      target futex user address
+ * nr_wake:     number of waiters to wake (must be 1 for requeue_pi)
+ * nr_requeue:  number of waiters to requeue (0-INT_MAX)
+ * requeue_pi:  if we are attempting to requeue from a non-pi futex to a
+ *              pi futex (pi to pi requeue is not supported)
+ *
+ * Requeue waiters on uaddr1 to uaddr2. In the requeue_pi case, try to acquire
+ * uaddr2 atomically on behalf of the top waiter.
+ *
+ * Returns:
+ * >=0 - on success, the number of tasks requeued or woken
+ *  <0 - on error
  */
 static int futex_requeue(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
-                         int nr_wake, int nr_requeue, u32 *cmpval)
+                         int nr_wake, int nr_requeue, u32 *cmpval,
+                         int requeue_pi)
 {
         union futex_key key1 = FUTEX_KEY_INIT, key2 = FUTEX_KEY_INIT;
+        int drop_count = 0, task_count = 0, ret;
+        struct futex_pi_state *pi_state = NULL;
         struct futex_hash_bucket *hb1, *hb2;
         struct plist_head *head1;
         struct futex_q *this, *next;
-        int ret, drop_count = 0;
+        u32 curval2;
+
+        if (requeue_pi) {
+                /*
+                 * requeue_pi requires a pi_state, try to allocate it now
+                 * without any locks in case it fails.
+                 */
+                if (refill_pi_state_cache())
+                        return -ENOMEM;
+                /*
+                 * requeue_pi must wake as many tasks as it can, up to nr_wake
+                 * + nr_requeue, since it acquires the rt_mutex prior to
+                 * returning to userspace, so as to not leave the rt_mutex with
+                 * waiters and no owner.  However, second and third wake-ups
+                 * cannot be predicted as they involve race conditions with the
+                 * first wake and a fault while looking up the pi_state.  Both
+                 * pthread_cond_signal() and pthread_cond_broadcast() should
+                 * use nr_wake=1.
+                 */
+                if (nr_wake != 1)
+                        return -EINVAL;
+        }
 
 retry:
-        ret = get_futex_key(uaddr1, fshared, &key1);
+        if (pi_state != NULL) {
+                /*
+                 * We will have to lookup the pi_state again, so free this one
+                 * to keep the accounting correct.
+                 */
+                free_pi_state(pi_state);
+                pi_state = NULL;
+        }
+
+        ret = get_futex_key(uaddr1, fshared, &key1, VERIFY_READ);
         if (unlikely(ret != 0))
                 goto out;
-        ret = get_futex_key(uaddr2, fshared, &key2);
+        ret = get_futex_key(uaddr2, fshared, &key2,
+                            requeue_pi ? VERIFY_WRITE : VERIFY_READ);
         if (unlikely(ret != 0))
                 goto out_put_key1;
 
@@ -852,32 +1172,99 @@ retry_private:
                 }
         }
 
+        if (requeue_pi && (task_count - nr_wake < nr_requeue)) {
+                /*
+                 * Attempt to acquire uaddr2 and wake the top waiter. If we
+                 * intend to requeue waiters, force setting the FUTEX_WAITERS
+                 * bit.  We force this here where we are able to easily handle
+                 * faults rather in the requeue loop below.
+                 */
+                ret = futex_proxy_trylock_atomic(uaddr2, hb1, hb2, &key1,
+                                                 &key2, &pi_state, nr_requeue);
+
+                /*
+                 * At this point the top_waiter has either taken uaddr2 or is
+                 * waiting on it.  If the former, then the pi_state will not
+                 * exist yet, look it up one more time to ensure we have a
+                 * reference to it.
+                 */
+                if (ret == 1) {
+                        WARN_ON(pi_state);
+                        task_count++;
+                        ret = get_futex_value_locked(&curval2, uaddr2);
+                        if (!ret)
+                                ret = lookup_pi_state(curval2, hb2, &key2,
+                                                      &pi_state);
+                }
+
+                switch (ret) {
+                case 0:
+                        break;
+                case -EFAULT:
+                        double_unlock_hb(hb1, hb2);
+                        put_futex_key(fshared, &key2);
+                        put_futex_key(fshared, &key1);
+                        ret = get_user(curval2, uaddr2);
+                        if (!ret)
+                                goto retry;
+                        goto out;
+                case -EAGAIN:
+                        /* The owner was exiting, try again. */
+                        double_unlock_hb(hb1, hb2);
+                        put_futex_key(fshared, &key2);
+                        put_futex_key(fshared, &key1);
+                        cond_resched();
+                        goto retry;
+                default:
+                        goto out_unlock;
+                }
+        }
+
         head1 = &hb1->chain;
         plist_for_each_entry_safe(this, next, head1, list) {
-                if (!match_futex (&this->key, &key1))
+                if (task_count - nr_wake >= nr_requeue)
+                        break;
+
+                if (!match_futex(&this->key, &key1))
                         continue;
-                if (++ret <= nr_wake) {
+
+                WARN_ON(!requeue_pi && this->rt_waiter);
+                WARN_ON(requeue_pi && !this->rt_waiter);
+
+                /*
+                 * Wake nr_wake waiters.  For requeue_pi, if we acquired the
+                 * lock, we already woke the top_waiter.  If not, it will be
+                 * woken by futex_unlock_pi().
+                 */
+                if (++task_count <= nr_wake && !requeue_pi) {
                         wake_futex(this);
-                } else {
-                        /*
-                         * If key1 and key2 hash to the same bucket, no need to
-                         * requeue.
-                         */
-                        if (likely(head1 != &hb2->chain)) {
-                                plist_del(&this->list, &hb1->chain);
-                                plist_add(&this->list, &hb2->chain);
-                                this->lock_ptr = &hb2->lock;
-#ifdef CONFIG_DEBUG_PI_LIST
-                                this->list.plist.lock = &hb2->lock;
-#endif
-                        }
-                        this->key = key2;
-                        get_futex_key_refs(&key2);
-                        drop_count++;
+                        continue;
+                }
 
-                        if (ret - nr_wake >= nr_requeue)
-                                break;
+                /*
+                 * Requeue nr_requeue waiters and possibly one more in the case
+                 * of requeue_pi if we couldn't acquire the lock atomically.
+                 */
+                if (requeue_pi) {
+                        /* Prepare the waiter to take the rt_mutex. */
+                        atomic_inc(&pi_state->refcount);
+                        this->pi_state = pi_state;
+                        ret = rt_mutex_start_proxy_lock(&pi_state->pi_mutex,
+                                                        this->rt_waiter,
+                                                        this->task, 1);
+                        if (ret == 1) {
+                                /* We got the lock. */
+                                requeue_pi_wake_futex(this, &key2);
+                                continue;
+                        } else if (ret) {
+                                /* -EDEADLK */
+                                this->pi_state = NULL;
+                                free_pi_state(pi_state);
+                                goto out_unlock;
+                        }
                 }
+                requeue_futex(this, hb1, hb2, &key2);
+                drop_count++;
         }
 
 out_unlock:
@@ -897,7 +1284,9 @@ out_put_keys:
 out_put_key1:
         put_futex_key(fshared, &key1);
 out:
-        return ret;
+        if (pi_state != NULL)
+                free_pi_state(pi_state);
+        return ret ? ret : task_count;
 }
 
 /* The key must be already stored in q->key. */
@@ -905,8 +1294,6 @@ static inline struct futex_hash_bucket *queue_lock(struct futex_q *q)
 {
         struct futex_hash_bucket *hb;
 
-        init_waitqueue_head(&q->waiter);
-
         get_futex_key_refs(&q->key);
         hb = hash_futex(&q->key);
         q->lock_ptr = &hb->lock;
@@ -1117,35 +1504,149 @@ handle_fault:
  */
 #define FLAGS_SHARED            0x01
 #define FLAGS_CLOCKRT           0x02
+#define FLAGS_HAS_TIMEOUT       0x04
 
 static long futex_wait_restart(struct restart_block *restart);
 
-static int futex_wait(u32 __user *uaddr, int fshared,
-                      u32 val, ktime_t *abs_time, u32 bitset, int clockrt)
+/**
+ * fixup_owner() - Post lock pi_state and corner case management
+ * @uaddr:      user address of the futex
+ * @fshared:    whether the futex is shared (1) or not (0)
+ * @q:          futex_q (contains pi_state and access to the rt_mutex)
+ * @locked:     if the attempt to take the rt_mutex succeeded (1) or not (0)
+ *
+ * After attempting to lock an rt_mutex, this function is called to cleanup
+ * the pi_state owner as well as handle race conditions that may allow us to
+ * acquire the lock. Must be called with the hb lock held.
+ *
+ * Returns:
+ *  1 - success, lock taken
+ *  0 - success, lock not taken
+ * <0 - on error (-EFAULT)
+ */
+static int fixup_owner(u32 __user *uaddr, int fshared, struct futex_q *q,
+                       int locked)
 {
-        struct task_struct *curr = current;
-        struct restart_block *restart;
-        DECLARE_WAITQUEUE(wait, curr);
-        struct futex_hash_bucket *hb;
-        struct futex_q q;
-        u32 uval;
-        int ret;
-        struct hrtimer_sleeper t;
-        int rem = 0;
+        struct task_struct *owner;
+        int ret = 0;
 
-        if (!bitset)
-                return -EINVAL;
+        if (locked) {
+                /*
+                 * Got the lock. We might not be the anticipated owner if we
+                 * did a lock-steal - fix up the PI-state in that case:
+                 */
+                if (q->pi_state->owner != current)
+                        ret = fixup_pi_state_owner(uaddr, q, current, fshared);
+                goto out;
+        }
 
-        q.pi_state = NULL;
-        q.bitset = bitset;
-retry:
-        q.key = FUTEX_KEY_INIT;
-        ret = get_futex_key(uaddr, fshared, &q.key);
-        if (unlikely(ret != 0))
+        /*
+         * Catch the rare case, where the lock was released when we were on the
+         * way back before we locked the hash bucket.
+         */
+        if (q->pi_state->owner == current) {
+                /*
+                 * Try to get the rt_mutex now. This might fail as some other
+                 * task acquired the rt_mutex after we removed ourself from the
+                 * rt_mutex waiters list.
+                 */
+                if (rt_mutex_trylock(&q->pi_state->pi_mutex)) {
+                        locked = 1;
+                        goto out;
+                }
+
+                /*
+                 * pi_state is incorrect, some other task did a lock steal and
+                 * we returned due to timeout or signal without taking the
+                 * rt_mutex. Too late. We can access the rt_mutex_owner without
+                 * locking, as the other task is now blocked on the hash bucket
+                 * lock. Fix the state up.
+                 */
+                owner = rt_mutex_owner(&q->pi_state->pi_mutex);
+                ret = fixup_pi_state_owner(uaddr, q, owner, fshared);
                 goto out;
+        }
 
-retry_private:
-        hb = queue_lock(&q);
+        /*
+         * Paranoia check. If we did not take the lock, then we should not be
+         * the owner, nor the pending owner, of the rt_mutex.
+         */
+        if (rt_mutex_owner(&q->pi_state->pi_mutex) == current)
+                printk(KERN_ERR "fixup_owner: ret = %d pi-mutex: %p "
+                                "pi-state %p\n", ret,
+                                q->pi_state->pi_mutex.owner,
+                                q->pi_state->owner);
+
+out:
+        return ret ? ret : locked;
+}
+
+/**
+ * futex_wait_queue_me() - queue_me() and wait for wakeup, timeout, or signal
+ * @hb:         the futex hash bucket, must be locked by the caller
+ * @q:          the futex_q to queue up on
+ * @timeout:    the prepared hrtimer_sleeper, or null for no timeout
+ */
+static void futex_wait_queue_me(struct futex_hash_bucket *hb, struct futex_q *q,
+                                struct hrtimer_sleeper *timeout)
+{
+        queue_me(q, hb);
+
+        /*
+         * There might have been scheduling since the queue_me(), as we
+         * cannot hold a spinlock across the get_user() in case it
+         * faults, and we cannot just set TASK_INTERRUPTIBLE state when
+         * queueing ourselves into the futex hash. This code thus has to
+         * rely on the futex_wake() code removing us from hash when it
+         * wakes us up.
+         */
+        set_current_state(TASK_INTERRUPTIBLE);
+
+        /* Arm the timer */
+        if (timeout) {
+                hrtimer_start_expires(&timeout->timer, HRTIMER_MODE_ABS);
+                if (!hrtimer_active(&timeout->timer))
+                        timeout->task = NULL;
+        }
+
+        /*
+         * !plist_node_empty() is safe here without any lock.
+         * q.lock_ptr != 0 is not safe, because of ordering against wakeup.
+         */
+        if (likely(!plist_node_empty(&q->list))) {
+                /*
+                 * If the timer has already expired, current will already be
+                 * flagged for rescheduling. Only call schedule if there
+                 * is no timeout, or if it has yet to expire.
+                 */
+                if (!timeout || timeout->task)
+                        schedule();
+        }
+        __set_current_state(TASK_RUNNING);
+}
+
+/**
+ * futex_wait_setup() - Prepare to wait on a futex
+ * @uaddr:      the futex userspace address
+ * @val:        the expected value
+ * @fshared:    whether the futex is shared (1) or not (0)
+ * @q:          the associated futex_q
+ * @hb:         storage for hash_bucket pointer to be returned to caller
+ *
+ * Setup the futex_q and locate the hash_bucket.  Get the futex value and
+ * compare it with the expected value.  Handle atomic faults internally.
+ * Return with the hb lock held and a q.key reference on success, and unlocked
+ * with no q.key reference on failure.
+ *
+ * Returns:
+ *  0 - uaddr contains val and hb has been locked
+ * <1 - -EFAULT or -EWOULDBLOCK (uaddr does not contain val) and hb is unlcoked
+ */
+static int futex_wait_setup(u32 __user *uaddr, u32 val, int fshared,
+                           struct futex_q *q, struct futex_hash_bucket **hb)
+{
+        u32 uval;
+        int ret;
 
         /*
          * Access the page AFTER the hash-bucket is locked.
@@ -1163,95 +1664,83 @@ retry_private:
          * A consequence is that futex_wait() can return zero and absorb
          * a wakeup when *uaddr != val on entry to the syscall.  This is
          * rare, but normal.
-         *
-         * For shared futexes, we hold the mmap semaphore, so the mapping
-         * cannot have changed since we looked it up in get_futex_key.
          */
+retry:
+        q->key = FUTEX_KEY_INIT;
+        ret = get_futex_key(uaddr, fshared, &q->key, VERIFY_READ);
+        if (unlikely(ret != 0))
+                return ret;
+
+retry_private:
+        *hb = queue_lock(q);
+
         ret = get_futex_value_locked(&uval, uaddr);
 
-        if (unlikely(ret)) {
-                queue_unlock(&q, hb);
+        if (ret) {
+                queue_unlock(q, *hb);
 
                 ret = get_user(uval, uaddr);
                 if (ret)
-                        goto out_put_key;
+                        goto out;
 
                 if (!fshared)
                         goto retry_private;
 
-                put_futex_key(fshared, &q.key);
+                put_futex_key(fshared, &q->key);
                 goto retry;
         }
-        ret = -EWOULDBLOCK;
-        if (unlikely(uval != val)) {
-                queue_unlock(&q, hb);
-                goto out_put_key;
-        }
 
-        /* Only actually queue if *uaddr contained val.  */
-        queue_me(&q, hb);
+        if (uval != val) {
+                queue_unlock(q, *hb);
+                ret = -EWOULDBLOCK;
+        }
 
-        /*
-         * There might have been scheduling since the queue_me(), as we
-         * cannot hold a spinlock across the get_user() in case it
-         * faults, and we cannot just set TASK_INTERRUPTIBLE state when
-         * queueing ourselves into the futex hash.  This code thus has to
-         * rely on the futex_wake() code removing us from hash when it
-         * wakes us up.
-         */
+out:
+        if (ret)
+                put_futex_key(fshared, &q->key);
+        return ret;
+}
 
-        /* add_wait_queue is the barrier after __set_current_state. */
-        __set_current_state(TASK_INTERRUPTIBLE);
-        add_wait_queue(&q.waiter, &wait);
-        /*
-         * !plist_node_empty() is safe here without any lock.
-         * q.lock_ptr != 0 is not safe, because of ordering against wakeup.
-         */
-        if (likely(!plist_node_empty(&q.list))) {
-                if (!abs_time)
-                        schedule();
-                else {
-                        hrtimer_init_on_stack(&t.timer,
-                                              clockrt ? CLOCK_REALTIME :
-                                              CLOCK_MONOTONIC,
-                                              HRTIMER_MODE_ABS);
-                        hrtimer_init_sleeper(&t, current);
-                        hrtimer_set_expires_range_ns(&t.timer, *abs_time,
-                                                     current->timer_slack_ns);
-
-                        hrtimer_start_expires(&t.timer, HRTIMER_MODE_ABS);
-                        if (!hrtimer_active(&t.timer))
-                                t.task = NULL;
+static int futex_wait(u32 __user *uaddr, int fshared,
+                      u32 val, ktime_t *abs_time, u32 bitset, int clockrt)
+{
+        struct hrtimer_sleeper timeout, *to = NULL;
+        struct restart_block *restart;
+        struct futex_hash_bucket *hb;
+        struct futex_q q;
+        int ret;
 
-                        /*
-                         * the timer could have already expired, in which
-                         * case current would be flagged for rescheduling.
-                         * Don't bother calling schedule.
-                         */
-                        if (likely(t.task))
-                                schedule();
+        if (!bitset)
+                return -EINVAL;
 
-                        hrtimer_cancel(&t.timer);
+        q.pi_state = NULL;
+        q.bitset = bitset;
+        q.rt_waiter = NULL;
 
-                        /* Flag if a timeout occured */
-                        rem = (t.task == NULL);
+        if (abs_time) {
+                to = &timeout;
 
-                        destroy_hrtimer_on_stack(&t.timer);
-                }
+                hrtimer_init_on_stack(&to->timer, clockrt ? CLOCK_REALTIME :
+                                      CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+                hrtimer_init_sleeper(to, current);
+                hrtimer_set_expires_range_ns(&to->timer, *abs_time,
+                                             current->timer_slack_ns);
         }
-        __set_current_state(TASK_RUNNING);
 
-        /*
-         * NOTE: we don't remove ourselves from the waitqueue because
-         * we are the only user of it.
-         */
+        /* Prepare to wait on uaddr. */
+        ret = futex_wait_setup(uaddr, val, fshared, &q, &hb);
+        if (ret)
+                goto out;
+
+        /* queue_me and wait for wakeup, timeout, or a signal. */
+        futex_wait_queue_me(hb, &q, to);
 
         /* If we were woken (and unqueued), we succeeded, whatever. */
         ret = 0;
         if (!unqueue_me(&q))
                 goto out_put_key;
         ret = -ETIMEDOUT;
-        if (rem)
+        if (to && !to->task)
                 goto out_put_key;
 
         /*
@@ -1268,7 +1757,7 @@ retry_private:
         restart->futex.val = val;
         restart->futex.time = abs_time->tv64;
         restart->futex.bitset = bitset;
-        restart->futex.flags = 0;
+        restart->futex.flags = FLAGS_HAS_TIMEOUT;
 
         if (fshared)
                 restart->futex.flags |= FLAGS_SHARED;
@@ -1280,6 +1769,10 @@ retry_private:
 out_put_key:
         put_futex_key(fshared, &q.key);
 out:
+        if (to) {
+                hrtimer_cancel(&to->timer);
+                destroy_hrtimer_on_stack(&to->timer);
+        }
         return ret;
 }
 
@@ -1288,13 +1781,16 @@ static long futex_wait_restart(struct restart_block *restart)
 {
         u32 __user *uaddr = (u32 __user *)restart->futex.uaddr;
         int fshared = 0;
-        ktime_t t;
+        ktime_t t, *tp = NULL;
 
-        t.tv64 = restart->futex.time;
+        if (restart->futex.flags & FLAGS_HAS_TIMEOUT) {
+                t.tv64 = restart->futex.time;
+                tp = &t;
+        }
         restart->fn = do_no_restart_syscall;
         if (restart->futex.flags & FLAGS_SHARED)
                 fshared = 1;
-        return (long)futex_wait(uaddr, fshared, restart->futex.val, &t,
+        return (long)futex_wait(uaddr, fshared, restart->futex.val, tp,
                                 restart->futex.bitset,
                                 restart->futex.flags & FLAGS_CLOCKRT);
 }
@@ -1310,11 +1806,10 @@ static int futex_lock_pi(u32 __user *uaddr, int fshared,
                          int detect, ktime_t *time, int trylock)
 {
         struct hrtimer_sleeper timeout, *to = NULL;
-        struct task_struct *curr = current;
         struct futex_hash_bucket *hb;
-        u32 uval, newval, curval;
+        u32 uval;
         struct futex_q q;
-        int ret, lock_taken, ownerdied = 0;
+        int res, ret;
 
         if (refill_pi_state_cache())
                 return -ENOMEM;
@@ -1328,90 +1823,25 @@ static int futex_lock_pi(u32 __user *uaddr, int fshared,
         }
 
         q.pi_state = NULL;
+        q.rt_waiter = NULL;
 retry:
         q.key = FUTEX_KEY_INIT;
-        ret = get_futex_key(uaddr, fshared, &q.key);
+        ret = get_futex_key(uaddr, fshared, &q.key, VERIFY_WRITE);
         if (unlikely(ret != 0))
                 goto out;
 
 retry_private:
         hb = queue_lock(&q);
 
-retry_locked:
-        ret = lock_taken = 0;
-
-        /*
-         * To avoid races, we attempt to take the lock here again
-         * (by doing a 0 -> TID atomic cmpxchg), while holding all
-         * the locks. It will most likely not succeed.
-         */
-        newval = task_pid_vnr(current);
-
-        curval = cmpxchg_futex_value_locked(uaddr, 0, newval);
-
-        if (unlikely(curval == -EFAULT))
-                goto uaddr_faulted;
-
-        /*
-         * Detect deadlocks. In case of REQUEUE_PI this is a valid
-         * situation and we return success to user space.
-         */
-        if (unlikely((curval & FUTEX_TID_MASK) == task_pid_vnr(current))) {
-                ret = -EDEADLK;
-                goto out_unlock_put_key;
-        }
-
-        /*
-         * Surprise - we got the lock. Just return to userspace:
-         */
-        if (unlikely(!curval))
-                goto out_unlock_put_key;
-
-        uval = curval;
-
-        /*
-         * Set the WAITERS flag, so the owner will know it has someone
-         * to wake at next unlock
-         */
-        newval = curval | FUTEX_WAITERS;
-
-        /*
-         * There are two cases, where a futex might have no owner (the
-         * owner TID is 0): OWNER_DIED. We take over the futex in this
-         * case. We also do an unconditional take over, when the owner
-         * of the futex died.
-         *
-         * This is safe as we are protected by the hash bucket lock !
-         */
-        if (unlikely(ownerdied || !(curval & FUTEX_TID_MASK))) {
-                /* Keep the OWNER_DIED bit */
-                newval = (curval & ~FUTEX_TID_MASK) | task_pid_vnr(current);
-                ownerdied = 0;
-                lock_taken = 1;
-        }
-
-        curval = cmpxchg_futex_value_locked(uaddr, uval, newval);
-
-        if (unlikely(curval == -EFAULT))
-                goto uaddr_faulted;
-        if (unlikely(curval != uval))
-                goto retry_locked;
-
-        /*
-         * We took the lock due to owner died take over.
-         */
-        if (unlikely(lock_taken))
-                goto out_unlock_put_key;
-
-        /*
-         * We dont have the lock. Look up the PI state (or create it if
-         * we are the first waiter):
-         */
-        ret = lookup_pi_state(uval, hb, &q.key, &q.pi_state);
-
+        ret = futex_lock_pi_atomic(uaddr, hb, &q.key, &q.pi_state, current, 0);
         if (unlikely(ret)) {
                 switch (ret) {
-
+                case 1:
+                        /* We got the lock. */
+                        ret = 0;
+                        goto out_unlock_put_key;
+                case -EFAULT:
+                        goto uaddr_faulted;
                 case -EAGAIN:
                         /*
                          * Task is exiting and we just wait for the
@@ -1421,25 +1851,6 @@ retry_locked:
                         put_futex_key(fshared, &q.key);
                         cond_resched();
                         goto retry;
-
-                case -ESRCH:
-                        /*
-                         * No owner found for this futex. Check if the
-                         * OWNER_DIED bit is set to figure out whether
-                         * this is a robust futex or not.
-                         */
-                        if (get_futex_value_locked(&curval, uaddr))
-                                goto uaddr_faulted;
-
-                        /*
-                         * We simply start over in case of a robust
-                         * futex. The code above will take the futex
-                         * and return happy.
-                         */
-                        if (curval & FUTEX_OWNER_DIED) {
-                                ownerdied = 1;
-                                goto retry_locked;
-                        }
                 default:
                         goto out_unlock_put_key;
                 }
@@ -1463,71 +1874,21 @@ retry_locked:
         }
 
         spin_lock(q.lock_ptr);
-
-        if (!ret) {
-                /*
-                 * Got the lock. We might not be the anticipated owner
-                 * if we did a lock-steal - fix up the PI-state in
-                 * that case:
-                 */
-                if (q.pi_state->owner != curr)
-                        ret = fixup_pi_state_owner(uaddr, &q, curr, fshared);
-        } else {
-                /*
-                 * Catch the rare case, where the lock was released
-                 * when we were on the way back before we locked the
-                 * hash bucket.
-                 */
-                if (q.pi_state->owner == curr) {
-                        /*
-                         * Try to get the rt_mutex now. This might
-                         * fail as some other task acquired the
-                         * rt_mutex after we removed ourself from the
-                         * rt_mutex waiters list.
-                         */
-                        if (rt_mutex_trylock(&q.pi_state->pi_mutex))
-                                ret = 0;
-                        else {
-                                /*
-                                 * pi_state is incorrect, some other
-                                 * task did a lock steal and we
-                                 * returned due to timeout or signal
-                                 * without taking the rt_mutex. Too
-                                 * late. We can access the
-                                 * rt_mutex_owner without locking, as
-                                 * the other task is now blocked on
-                                 * the hash bucket lock. Fix the state
-                                 * up.
-                                 */
-                                struct task_struct *owner;
-                                int res;
-
-                                owner = rt_mutex_owner(&q.pi_state->pi_mutex);
-                                res = fixup_pi_state_owner(uaddr, &q, owner,
-                                                           fshared);
-
-                                /* propagate -EFAULT, if the fixup failed */
-                                if (res)
-                                        ret = res;
-                        }
-                } else {
-                        /*
-                         * Paranoia check. If we did not take the lock
-                         * in the trylock above, then we should not be
-                         * the owner of the rtmutex, neither the real
-                         * nor the pending one:
-                         */
-                        if (rt_mutex_owner(&q.pi_state->pi_mutex) == curr)
-                                printk(KERN_ERR "futex_lock_pi: ret = %d "
-                                       "pi-mutex: %p pi-state %p\n", ret,
-                                       q.pi_state->pi_mutex.owner,
-                                       q.pi_state->owner);
-                }
-        }
+        /*
+         * Fixup the pi_state owner and possibly acquire the lock if we
+         * haven't already.
+         */
+        res = fixup_owner(uaddr, fshared, &q, !ret);
+        /*
+         * If fixup_owner() returned an error, proprogate that.  If it acquired
+         * the lock, clear our -ETIMEDOUT or -EINTR.
+         */
+        if (res)
+                ret = (res < 0) ? res : 0;
 
         /*
-         * If fixup_pi_state_owner() faulted and was unable to handle the
-         * fault, unlock it and return the fault to userspace.
+         * If fixup_owner() faulted and was unable to handle the fault, unlock
+         * it and return the fault to userspace.
          */
         if (ret && (rt_mutex_owner(&q.pi_state->pi_mutex) == current))
                 rt_mutex_unlock(&q.pi_state->pi_mutex);
@@ -1535,9 +1896,7 @@ retry_locked:
         /* Unqueue and drop the lock */
         unqueue_me_pi(&q);
 
-        if (to)
-                destroy_hrtimer_on_stack(&to->timer);
-        return ret != -EINTR ? ret : -ERESTARTNOINTR;
+        goto out;
 
 out_unlock_put_key:
         queue_unlock(&q, hb);
@@ -1547,7 +1906,7 @@ out_put_key:
 out:
         if (to)
                 destroy_hrtimer_on_stack(&to->timer);
-        return ret;
+        return ret != -EINTR ? ret : -ERESTARTNOINTR;
 
 uaddr_faulted:
         /*
@@ -1570,7 +1929,6 @@ uaddr_faulted:
         goto retry;
 }
 
-
 /*
  * Userspace attempted a TID -> 0 atomic transition, and failed.
  * This is the in-kernel slowpath: we look up the PI state (if any),
@@ -1594,7 +1952,7 @@ retry:
         if ((uval & FUTEX_TID_MASK) != task_pid_vnr(current))
                 return -EPERM;
 
-        ret = get_futex_key(uaddr, fshared, &key);
+        ret = get_futex_key(uaddr, fshared, &key, VERIFY_WRITE);
         if (unlikely(ret != 0))
                 goto out;
 
@@ -1672,6 +2030,229 @@ pi_faulted:
         return ret;
 }
 
+/**
+ * handle_early_requeue_pi_wakeup() - Detect early wakeup on the initial futex
+ * @hb:         the hash_bucket futex_q was original enqueued on
+ * @q:          the futex_q woken while waiting to be requeued
+ * @key2:       the futex_key of the requeue target futex
+ * @timeout:    the timeout associated with the wait (NULL if none)
+ *
+ * Detect if the task was woken on the initial futex as opposed to the requeue
+ * target futex.  If so, determine if it was a timeout or a signal that caused
+ * the wakeup and return the appropriate error code to the caller.  Must be
+ * called with the hb lock held.
+ *
+ * Returns
+ *  0 - no early wakeup detected
+ * <0 - -ETIMEDOUT or -ERESTARTNOINTR
+ */
+static inline
+int handle_early_requeue_pi_wakeup(struct futex_hash_bucket *hb,
+                                   struct futex_q *q, union futex_key *key2,
+                                   struct hrtimer_sleeper *timeout)
+{
+        int ret = 0;
+
+        /*
+         * With the hb lock held, we avoid races while we process the wakeup.
+         * We only need to hold hb (and not hb2) to ensure atomicity as the
+         * wakeup code can't change q.key from uaddr to uaddr2 if we hold hb.
+         * It can't be requeued from uaddr2 to something else since we don't
+         * support a PI aware source futex for requeue.
+         */
+        if (!match_futex(&q->key, key2)) {
+                WARN_ON(q->lock_ptr && (&hb->lock != q->lock_ptr));
+                /*
+                 * We were woken prior to requeue by a timeout or a signal.
+                 * Unqueue the futex_q and determine which it was.
+                 */
+                plist_del(&q->list, &q->list.plist);
+                drop_futex_key_refs(&q->key);
+
+                if (timeout && !timeout->task)
+                        ret = -ETIMEDOUT;
+                else
+                        ret = -ERESTARTNOINTR;
+        }
+        return ret;
+}
+
+/**
+ * futex_wait_requeue_pi() - Wait on uaddr and take uaddr2
+ * @uaddr:      the futex we initialyl wait on (non-pi)
+ * @fshared:    whether the futexes are shared (1) or not (0).  They must be
+ *              the same type, no requeueing from private to shared, etc.
+ * @val:        the expected value of uaddr
+ * @abs_time:   absolute timeout
+ * @bitset:     32 bit wakeup bitset set by userspace, defaults to all.
+ * @clockrt:    whether to use CLOCK_REALTIME (1) or CLOCK_MONOTONIC (0)
+ * @uaddr2:     the pi futex we will take prior to returning to user-space
+ *
+ * The caller will wait on uaddr and will be requeued by futex_requeue() to
+ * uaddr2 which must be PI aware.  Normal wakeup will wake on uaddr2 and
+ * complete the acquisition of the rt_mutex prior to returning to userspace.
+ * This ensures the rt_mutex maintains an owner when it has waiters; without
+ * one, the pi logic wouldn't know which task to boost/deboost, if there was a
+ * need to.
+ *
+ * We call schedule in futex_wait_queue_me() when we enqueue and return there
+ * via the following:
+ * 1) wakeup on uaddr2 after an atomic lock acquisition by futex_requeue()
+ * 2) wakeup on uaddr2 after a requeue and subsequent unlock
+ * 3) signal (before or after requeue)
+ * 4) timeout (before or after requeue)
+ *
+ * If 3, we setup a restart_block with futex_wait_requeue_pi() as the function.
+ *
+ * If 2, we may then block on trying to take the rt_mutex and return via:
+ * 5) successful lock
+ * 6) signal
+ * 7) timeout
+ * 8) other lock acquisition failure
+ *
+ * If 6, we setup a restart_block with futex_lock_pi() as the function.
+ *
+ * If 4 or 7, we cleanup and return with -ETIMEDOUT.
+ *
+ * Returns:
+ *  0 - On success
+ * <0 - On error
+ */
+static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
+                                 u32 val, ktime_t *abs_time, u32 bitset,
+                                 int clockrt, u32 __user *uaddr2)
+{
+        struct hrtimer_sleeper timeout, *to = NULL;
+        struct rt_mutex_waiter rt_waiter;
+        struct rt_mutex *pi_mutex = NULL;
+        struct futex_hash_bucket *hb;
+        union futex_key key2;
+        struct futex_q q;
+        int res, ret;
+
+        if (!bitset)
+                return -EINVAL;
+
+        if (abs_time) {
+                to = &timeout;
+                hrtimer_init_on_stack(&to->timer, clockrt ? CLOCK_REALTIME :
+                                      CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+                hrtimer_init_sleeper(to, current);
+                hrtimer_set_expires_range_ns(&to->timer, *abs_time,
+                                             current->timer_slack_ns);
+        }
+
+        /*
+         * The waiter is allocated on our stack, manipulated by the requeue
+         * code while we sleep on uaddr.
+         */
+        debug_rt_mutex_init_waiter(&rt_waiter);
+        rt_waiter.task = NULL;
+
+        q.pi_state = NULL;
+        q.bitset = bitset;
+        q.rt_waiter = &rt_waiter;
+
+        key2 = FUTEX_KEY_INIT;
+        ret = get_futex_key(uaddr2, fshared, &key2, VERIFY_WRITE);
+        if (unlikely(ret != 0))
+                goto out;
+
+        /* Prepare to wait on uaddr. */
+        ret = futex_wait_setup(uaddr, val, fshared, &q, &hb);
+        if (ret)
+                goto out_key2;
+
+        /* Queue the futex_q, drop the hb lock, wait for wakeup. */
+        futex_wait_queue_me(hb, &q, to);
+
+        spin_lock(&hb->lock);
+        ret = handle_early_requeue_pi_wakeup(hb, &q, &key2, to);
+        spin_unlock(&hb->lock);
+        if (ret)
+                goto out_put_keys;
+
+        /*
+         * In order for us to be here, we know our q.key == key2, and since
+         * we took the hb->lock above, we also know that futex_requeue() has
+         * completed and we no longer have to concern ourselves with a wakeup
+         * race with the atomic proxy lock acquition by the requeue code.
+         */
+
+        /* Check if the requeue code acquired the second futex for us. */
+        if (!q.rt_waiter) {
+                /*
+                 * Got the lock. We might not be the anticipated owner if we
+                 * did a lock-steal - fix up the PI-state in that case.
+                 */
+                if (q.pi_state && (q.pi_state->owner != current)) {
+                        spin_lock(q.lock_ptr);
+                        ret = fixup_pi_state_owner(uaddr2, &q, current,
+                                                   fshared);
+                        spin_unlock(q.lock_ptr);
+                }
+        } else {
+                /*
+                 * We have been woken up by futex_unlock_pi(), a timeout, or a
+                 * signal.  futex_unlock_pi() will not destroy the lock_ptr nor
+                 * the pi_state.
+                 */
+                WARN_ON(!&q.pi_state);
+                pi_mutex = &q.pi_state->pi_mutex;
+                ret = rt_mutex_finish_proxy_lock(pi_mutex, to, &rt_waiter, 1);
+                debug_rt_mutex_free_waiter(&rt_waiter);
+
+                spin_lock(q.lock_ptr);
+                /*
+                 * Fixup the pi_state owner and possibly acquire the lock if we
+                 * haven't already.
+                 */
+                res = fixup_owner(uaddr2, fshared, &q, !ret);
+                /*
+                 * If fixup_owner() returned an error, proprogate that.  If it
+                 * acquired the lock, clear our -ETIMEDOUT or -EINTR.
+                 */
+                if (res)
+                        ret = (res < 0) ? res : 0;
+
+                /* Unqueue and drop the lock. */
+                unqueue_me_pi(&q);
+        }
+
+        /*
+         * If fixup_pi_state_owner() faulted and was unable to handle the
+         * fault, unlock the rt_mutex and return the fault to userspace.
+         */
+        if (ret == -EFAULT) {
+                if (rt_mutex_owner(pi_mutex) == current)
+                        rt_mutex_unlock(pi_mutex);
+        } else if (ret == -EINTR) {
+                /*
+                 * We've already been requeued, but we have no way to
+                 * restart by calling futex_lock_pi() directly. We
+                 * could restart the syscall, but that will look at
+                 * the user space value and return right away. So we
+                 * drop back with EWOULDBLOCK to tell user space that
+                 * "val" has been changed. That's the same what the
+                 * restart of the syscall would do in
+                 * futex_wait_setup().
+                 */
+                ret = -EWOULDBLOCK;
+        }
+
+out_put_keys:
+        put_futex_key(fshared, &q.key);
+out_key2:
+        put_futex_key(fshared, &key2);
+
+out:
+        if (to) {
+                hrtimer_cancel(&to->timer);
+                destroy_hrtimer_on_stack(&to->timer);
+        }
+        return ret;
+}
+
 /*
  * Support for robust futexes: the kernel cleans up held futexes at
  * thread exit time.
@@ -1894,7 +2475,7 @@ long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
                 fshared = 1;
 
         clockrt = op & FUTEX_CLOCK_REALTIME;
-        if (clockrt && cmd != FUTEX_WAIT_BITSET)
+        if (clockrt && cmd != FUTEX_WAIT_BITSET && cmd != FUTEX_WAIT_REQUEUE_PI)
                 return -ENOSYS;
 
         switch (cmd) {
@@ -1909,10 +2490,11 @@ long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
                 ret = futex_wake(uaddr, fshared, val, val3);
                 break;
         case FUTEX_REQUEUE:
-                ret = futex_requeue(uaddr, fshared, uaddr2, val, val2, NULL);
+                ret = futex_requeue(uaddr, fshared, uaddr2, val, val2, NULL, 0);
                 break;
         case FUTEX_CMP_REQUEUE:
-                ret = futex_requeue(uaddr, fshared, uaddr2, val, val2, &val3);
+                ret = futex_requeue(uaddr, fshared, uaddr2, val, val2, &val3,
+                                    0);
                 break;
         case FUTEX_WAKE_OP:
                 ret = futex_wake_op(uaddr, fshared, uaddr2, val, val2, val3);
@@ -1929,6 +2511,15 @@ long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
                 if (futex_cmpxchg_enabled)
                         ret = futex_lock_pi(uaddr, fshared, 0, timeout, 1);
                 break;
+        case FUTEX_WAIT_REQUEUE_PI:
+                val3 = FUTEX_BITSET_MATCH_ANY;
+                ret = futex_wait_requeue_pi(uaddr, fshared, val, timeout, val3,
+                                            clockrt, uaddr2);
+                break;
+        case FUTEX_CMP_REQUEUE_PI:
+                ret = futex_requeue(uaddr, fshared, uaddr2, val, val2, &val3,
+                                    1);
+                break;
         default:
                 ret = -ENOSYS;
         }
@@ -1946,7 +2537,8 @@ SYSCALL_DEFINE6(futex, u32 __user *, uaddr, int, op, u32, val,
         int cmd = op & FUTEX_CMD_MASK;
 
         if (utime && (cmd == FUTEX_WAIT || cmd == FUTEX_LOCK_PI ||
-                      cmd == FUTEX_WAIT_BITSET)) {
+                      cmd == FUTEX_WAIT_BITSET ||
+                      cmd == FUTEX_WAIT_REQUEUE_PI)) {
                 if (copy_from_user(&ts, utime, sizeof(ts)) != 0)
                         return -EFAULT;
                 if (!timespec_valid(&ts))
@@ -1958,11 +2550,11 @@ SYSCALL_DEFINE6(futex, u32 __user *, uaddr, int, op, u32, val,
                 tp = &t;
         }
         /*
-         * requeue parameter in 'utime' if cmd == FUTEX_REQUEUE.
+         * requeue parameter in 'utime' if cmd == FUTEX_*_REQUEUE_*.
          * number of waiters to wake in 'utime' if cmd == FUTEX_WAKE_OP.
          */
         if (cmd == FUTEX_REQUEUE || cmd == FUTEX_CMP_REQUEUE ||
-            cmd == FUTEX_WAKE_OP)
+            cmd == FUTEX_CMP_REQUEUE_PI || cmd == FUTEX_WAKE_OP)
                 val2 = (u32) (unsigned long) utime;
 
         return do_futex(uaddr, op, val, tp, uaddr2, val2, val3);
diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig
new file mode 100644
index 000000000000..22e9dcfaa3d3
--- /dev/null
+++ b/kernel/gcov/Kconfig
@@ -0,0 +1,48 @@
+menu "GCOV-based kernel profiling"
+
+config GCOV_KERNEL
+        bool "Enable gcov-based kernel profiling"
+        depends on DEBUG_FS && CONSTRUCTORS
+        default n
+        ---help---
+        This option enables gcov-based code profiling (e.g. for code coverage
+        measurements).
+
+        If unsure, say N.
+
+        Additionally specify CONFIG_GCOV_PROFILE_ALL=y to get profiling data
+        for the entire kernel. To enable profiling for specific files or
+        directories, add a line similar to the following to the respective
+        Makefile:
+
+        For a single file (e.g. main.o):
+                GCOV_PROFILE_main.o := y
+
+        For all files in one directory:
+                GCOV_PROFILE := y
+
+        To exclude files from being profiled even when CONFIG_GCOV_PROFILE_ALL
+        is specified, use:
+
+                GCOV_PROFILE_main.o := n
+        and:
+                GCOV_PROFILE := n
+
+        Note that the debugfs filesystem has to be mounted to access
+        profiling data.
+
+config GCOV_PROFILE_ALL
+        bool "Profile entire Kernel"
+        depends on GCOV_KERNEL
+        depends on S390 || X86
+        default n
+        ---help---
+        This options activates profiling for the entire kernel.
+
+        If unsure, say N.
+
+        Note that a kernel compiled with profiling flags will be significantly
+        larger and run slower. Also be sure to exclude files from profiling
+        which are not linked to the kernel image to prevent linker errors.
+
+endmenu
diff --git a/kernel/gcov/Makefile b/kernel/gcov/Makefile
new file mode 100644
index 000000000000..3f761001d517
--- /dev/null
+++ b/kernel/gcov/Makefile
@@ -0,0 +1,3 @@
+EXTRA_CFLAGS := -DSRCTREE='"$(srctree)"' -DOBJTREE='"$(objtree)"'
+
+obj-$(CONFIG_GCOV_KERNEL) := base.o fs.o gcc_3_4.o
diff --git a/kernel/gcov/base.c b/kernel/gcov/base.c
new file mode 100644
index 000000000000..9b22d03cc581
--- /dev/null
+++ b/kernel/gcov/base.c
@@ -0,0 +1,148 @@
+/*
+ *  This code maintains a list of active profiling data structures.
+ *
+ *    Copyright IBM Corp. 2009
+ *    Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
+ *
+ *    Uses gcc-internal data definitions.
+ *    Based on the gcov-kernel patch by:
+ *               Hubertus Franke <frankeh@us.ibm.com>
+ *               Nigel Hinds <nhinds@us.ibm.com>
+ *               Rajan Ravindran <rajancr@us.ibm.com>
+ *               Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
+ *               Paul Larson
+ */
+
+#define pr_fmt(fmt)     "gcov: " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include "gcov.h"
+
+static struct gcov_info *gcov_info_head;
+static int gcov_events_enabled;
+static DEFINE_MUTEX(gcov_lock);
+
+/*
+ * __gcov_init is called by gcc-generated constructor code for each object
+ * file compiled with -fprofile-arcs.
+ */
+void __gcov_init(struct gcov_info *info)
+{
+        static unsigned int gcov_version;
+
+        mutex_lock(&gcov_lock);
+        if (gcov_version == 0) {
+                gcov_version = info->version;
+                /*
+                 * Printing gcc's version magic may prove useful for debugging
+                 * incompatibility reports.
+                 */
+                pr_info("version magic: 0x%x\n", gcov_version);
+        }
+        /*
+         * Add new profiling data structure to list and inform event
+         * listener.
+         */
+        info->next = gcov_info_head;
+        gcov_info_head = info;
+        if (gcov_events_enabled)
+                gcov_event(GCOV_ADD, info);
+        mutex_unlock(&gcov_lock);
+}
+EXPORT_SYMBOL(__gcov_init);
+
+/*
+ * These functions may be referenced by gcc-generated profiling code but serve
+ * no function for kernel profiling.
+ */
+void __gcov_flush(void)
+{
+        /* Unused. */
+}
+EXPORT_SYMBOL(__gcov_flush);
+
+void __gcov_merge_add(gcov_type *counters, unsigned int n_counters)
+{
+        /* Unused. */
+}
+EXPORT_SYMBOL(__gcov_merge_add);
+
+void __gcov_merge_single(gcov_type *counters, unsigned int n_counters)
+{
+        /* Unused. */
+}
+EXPORT_SYMBOL(__gcov_merge_single);
+
+void __gcov_merge_delta(gcov_type *counters, unsigned int n_counters)
+{
+        /* Unused. */
+}
+EXPORT_SYMBOL(__gcov_merge_delta);
+
+/**
+ * gcov_enable_events - enable event reporting through gcov_event()
+ *
+ * Turn on reporting of profiling data load/unload-events through the
+ * gcov_event() callback. Also replay all previous events once. This function
+ * is needed because some events are potentially generated too early for the
+ * callback implementation to handle them initially.
+ */
+void gcov_enable_events(void)
+{
+        struct gcov_info *info;
+
+        mutex_lock(&gcov_lock);
+        gcov_events_enabled = 1;
+        /* Perform event callback for previously registered entries. */
+        for (info = gcov_info_head; info; info = info->next)
+                gcov_event(GCOV_ADD, info);
+        mutex_unlock(&gcov_lock);
+}
+
+#ifdef CONFIG_MODULES
+static inline int within(void *addr, void *start, unsigned long size)
+{
+        return ((addr >= start) && (addr < start + size));
+}
+
+/* Update list and generate events when modules are unloaded. */
+static int gcov_module_notifier(struct notifier_block *nb, unsigned long event,
+                                void *data)
+{
+        struct module *mod = data;
+        struct gcov_info *info;
+        struct gcov_info *prev;
+
+        if (event != MODULE_STATE_GOING)
+                return NOTIFY_OK;
+        mutex_lock(&gcov_lock);
+        prev = NULL;
+        /* Remove entries located in module from linked list. */
+        for (info = gcov_info_head; info; info = info->next) {
+                if (within(info, mod->module_core, mod->core_size)) {
+                        if (prev)
+                                prev->next = info->next;
+                        else
+                                gcov_info_head = info->next;
+                        if (gcov_events_enabled)
+                                gcov_event(GCOV_REMOVE, info);
+                } else
+                        prev = info;
+        }
+        mutex_unlock(&gcov_lock);
+
+        return NOTIFY_OK;
+}
+
+static struct notifier_block gcov_nb = {
+        .notifier_call  = gcov_module_notifier,
+};
+
+static int __init gcov_init(void)
+{
+        return register_module_notifier(&gcov_nb);
+}
+device_initcall(gcov_init);
+#endif /* CONFIG_MODULES */
diff --git a/kernel/gcov/fs.c b/kernel/gcov/fs.c
new file mode 100644
index 000000000000..ef3c3f88a7a3
--- /dev/null
+++ b/kernel/gcov/fs.c
@@ -0,0 +1,673 @@
+/*
+ *  This code exports profiling data as debugfs files to userspace.
+ *
+ *    Copyright IBM Corp. 2009
+ *    Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
+ *
+ *    Uses gcc-internal data definitions.
+ *    Based on the gcov-kernel patch by:
+ *               Hubertus Franke <frankeh@us.ibm.com>
+ *               Nigel Hinds <nhinds@us.ibm.com>
+ *               Rajan Ravindran <rajancr@us.ibm.com>
+ *               Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
+ *               Paul Larson
+ *               Yi CDL Yang
+ */
+
+#define pr_fmt(fmt)     "gcov: " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/debugfs.h>
+#include <linux/fs.h>
+#include <linux/list.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/seq_file.h>
+#include "gcov.h"
+
+/**
+ * struct gcov_node - represents a debugfs entry
+ * @list: list head for child node list
+ * @children: child nodes
+ * @all: list head for list of all nodes
+ * @parent: parent node
+ * @info: associated profiling data structure if not a directory
+ * @ghost: when an object file containing profiling data is unloaded we keep a
+ *         copy of the profiling data here to allow collecting coverage data
+ *         for cleanup code. Such a node is called a "ghost".
+ * @dentry: main debugfs entry, either a directory or data file
+ * @links: associated symbolic links
+ * @name: data file basename
+ *
+ * struct gcov_node represents an entity within the gcov/ subdirectory
+ * of debugfs. There are directory and data file nodes. The latter represent
+ * the actual synthesized data file plus any associated symbolic links which
+ * are needed by the gcov tool to work correctly.
+ */
+struct gcov_node {
+        struct list_head list;
+        struct list_head children;
+        struct list_head all;
+        struct gcov_node *parent;
+        struct gcov_info *info;
+        struct gcov_info *ghost;
+        struct dentry *dentry;
+        struct dentry **links;
+        char name[0];
+};
+
+static const char objtree[] = OBJTREE;
+static const char srctree[] = SRCTREE;
+static struct gcov_node root_node;
+static struct dentry *reset_dentry;
+static LIST_HEAD(all_head);
+static DEFINE_MUTEX(node_lock);
+
+/* If non-zero, keep copies of profiling data for unloaded modules. */
+static int gcov_persist = 1;
+
+static int __init gcov_persist_setup(char *str)
+{
+        unsigned long val;
+
+        if (strict_strtoul(str, 0, &val)) {
+                pr_warning("invalid gcov_persist parameter '%s'\n", str);
+                return 0;
+        }
+        gcov_persist = val;
+        pr_info("setting gcov_persist to %d\n", gcov_persist);
+
+        return 1;
+}
+__setup("gcov_persist=", gcov_persist_setup);
+
+/*
+ * seq_file.start() implementation for gcov data files. Note that the
+ * gcov_iterator interface is designed to be more restrictive than seq_file
+ * (no start from arbitrary position, etc.), to simplify the iterator
+ * implementation.
+ */
+static void *gcov_seq_start(struct seq_file *seq, loff_t *pos)
+{
+        loff_t i;
+
+        gcov_iter_start(seq->private);
+        for (i = 0; i < *pos; i++) {
+                if (gcov_iter_next(seq->private))
+                        return NULL;
+        }
+        return seq->private;
+}
+
+/* seq_file.next() implementation for gcov data files. */
+static void *gcov_seq_next(struct seq_file *seq, void *data, loff_t *pos)
+{
+        struct gcov_iterator *iter = data;
+
+        if (gcov_iter_next(iter))
+                return NULL;
+        (*pos)++;
+
+        return iter;
+}
+
+/* seq_file.show() implementation for gcov data files. */
+static int gcov_seq_show(struct seq_file *seq, void *data)
+{
+        struct gcov_iterator *iter = data;
+
+        if (gcov_iter_write(iter, seq))
+                return -EINVAL;
+        return 0;
+}
+
+static void gcov_seq_stop(struct seq_file *seq, void *data)
+{
+        /* Unused. */
+}
+
+static const struct seq_operations gcov_seq_ops = {
+        .start  = gcov_seq_start,
+        .next   = gcov_seq_next,
+        .show   = gcov_seq_show,
+        .stop   = gcov_seq_stop,
+};
+
+/*
+ * Return the profiling data set for a given node. This can either be the
+ * original profiling data structure or a duplicate (also called "ghost")
+ * in case the associated object file has been unloaded.
+ */
+static struct gcov_info *get_node_info(struct gcov_node *node)
+{
+        if (node->info)
+                return node->info;
+
+        return node->ghost;
+}
+
+/*
+ * open() implementation for gcov data files. Create a copy of the profiling
+ * data set and initialize the iterator and seq_file interface.
+ */
+static int gcov_seq_open(struct inode *inode, struct file *file)
+{
+        struct gcov_node *node = inode->i_private;
+        struct gcov_iterator *iter;
+        struct seq_file *seq;
+        struct gcov_info *info;
+        int rc = -ENOMEM;
+
+        mutex_lock(&node_lock);
+        /*
+         * Read from a profiling data copy to minimize reference tracking
+         * complexity and concurrent access.
+         */
+        info = gcov_info_dup(get_node_info(node));
+        if (!info)
+                goto out_unlock;
+        iter = gcov_iter_new(info);
+        if (!iter)
+                goto err_free_info;
+        rc = seq_open(file, &gcov_seq_ops);
+        if (rc)
+                goto err_free_iter_info;
+        seq = file->private_data;
+        seq->private = iter;
+out_unlock:
+        mutex_unlock(&node_lock);
+        return rc;
+
+err_free_iter_info:
+        gcov_iter_free(iter);
+err_free_info:
+        gcov_info_free(info);
+        goto out_unlock;
+}
+
+/*
+ * release() implementation for gcov data files. Release resources allocated
+ * by open().
+ */
+static int gcov_seq_release(struct inode *inode, struct file *file)
+{
+        struct gcov_iterator *iter;
+        struct gcov_info *info;
+        struct seq_file *seq;
+
+        seq = file->private_data;
+        iter = seq->private;
+        info = gcov_iter_get_info(iter);
+        gcov_iter_free(iter);
+        gcov_info_free(info);
+        seq_release(inode, file);
+
+        return 0;
+}
+
+/*
+ * Find a node by the associated data file name. Needs to be called with
+ * node_lock held.
+ */
+static struct gcov_node *get_node_by_name(const char *name)
+{
+        struct gcov_node *node;
+        struct gcov_info *info;
+
+        list_for_each_entry(node, &all_head, all) {
+                info = get_node_info(node);
+                if (info && (strcmp(info->filename, name) == 0))
+                        return node;
+        }
+
+        return NULL;
+}
+
+static void remove_node(struct gcov_node *node);
+
+/*
+ * write() implementation for gcov data files. Reset profiling data for the
+ * associated file. If the object file has been unloaded (i.e. this is
+ * a "ghost" node), remove the debug fs node as well.
+ */
+static ssize_t gcov_seq_write(struct file *file, const char __user *addr,
+                              size_t len, loff_t *pos)
+{
+        struct seq_file *seq;
+        struct gcov_info *info;
+        struct gcov_node *node;
+
+        seq = file->private_data;
+        info = gcov_iter_get_info(seq->private);
+        mutex_lock(&node_lock);
+        node = get_node_by_name(info->filename);
+        if (node) {
+                /* Reset counts or remove node for unloaded modules. */
+                if (node->ghost)
+                        remove_node(node);
+                else
+                        gcov_info_reset(node->info);
+        }
+        /* Reset counts for open file. */
+        gcov_info_reset(info);
+        mutex_unlock(&node_lock);
+
+        return len;
+}
+
+/*
+ * Given a string <path> representing a file path of format:
+ *   path/to/file.gcda
+ * construct and return a new string:
+ *   <dir/>path/to/file.<ext>
+ */
+static char *link_target(const char *dir, const char *path, const char *ext)
+{
+        char *target;
+        char *old_ext;
+        char *copy;
+
+        copy = kstrdup(path, GFP_KERNEL);
+        if (!copy)
+                return NULL;
+        old_ext = strrchr(copy, '.');
+        if (old_ext)
+                *old_ext = '\0';
+        if (dir)
+                target = kasprintf(GFP_KERNEL, "%s/%s.%s", dir, copy, ext);
+        else
+                target = kasprintf(GFP_KERNEL, "%s.%s", copy, ext);
+        kfree(copy);
+
+        return target;
+}
+
+/*
+ * Construct a string representing the symbolic link target for the given
+ * gcov data file name and link type. Depending on the link type and the
+ * location of the data file, the link target can either point to a
+ * subdirectory of srctree, objtree or in an external location.
+ */
+static char *get_link_target(const char *filename, const struct gcov_link *ext)
+{
+        const char *rel;
+        char *result;
+
+        if (strncmp(filename, objtree, strlen(objtree)) == 0) {
+                rel = filename + strlen(objtree) + 1;
+                if (ext->dir == SRC_TREE)
+                        result = link_target(srctree, rel, ext->ext);
+                else
+                        result = link_target(objtree, rel, ext->ext);
+        } else {
+                /* External compilation. */
+                result = link_target(NULL, filename, ext->ext);
+        }
+
+        return result;
+}
+
+#define SKEW_PREFIX     ".tmp_"
+
+/*
+ * For a filename .tmp_filename.ext return filename.ext. Needed to compensate
+ * for filename skewing caused by the mod-versioning mechanism.
+ */
+static const char *deskew(const char *basename)
+{
+        if (strncmp(basename, SKEW_PREFIX, sizeof(SKEW_PREFIX) - 1) == 0)
+                return basename + sizeof(SKEW_PREFIX) - 1;
+        return basename;
+}
+
+/*
+ * Create links to additional files (usually .c and .gcno files) which the
+ * gcov tool expects to find in the same directory as the gcov data file.
+ */
+static void add_links(struct gcov_node *node, struct dentry *parent)
+{
+        char *basename;
+        char *target;
+        int num;
+        int i;
+
+        for (num = 0; gcov_link[num].ext; num++)
+                /* Nothing. */;
+        node->links = kcalloc(num, sizeof(struct dentry *), GFP_KERNEL);
+        if (!node->links)
+                return;
+        for (i = 0; i < num; i++) {
+                target = get_link_target(get_node_info(node)->filename,
+                                         &gcov_link[i]);
+                if (!target)
+                        goto out_err;
+                basename = strrchr(target, '/');
+                if (!basename)
+                        goto out_err;
+                basename++;
+                node->links[i] = debugfs_create_symlink(deskew(basename),
+                                                        parent, target);
+                if (!node->links[i])
+                        goto out_err;
+                kfree(target);
+        }
+
+        return;
+out_err:
+        kfree(target);
+        while (i-- > 0)
+                debugfs_remove(node->links[i]);
+        kfree(node->links);
+        node->links = NULL;
+}
+
+static const struct file_operations gcov_data_fops = {
+        .open           = gcov_seq_open,
+        .release        = gcov_seq_release,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .write          = gcov_seq_write,
+};
+
+/* Basic initialization of a new node. */
+static void init_node(struct gcov_node *node, struct gcov_info *info,
+                      const char *name, struct gcov_node *parent)
+{
+        INIT_LIST_HEAD(&node->list);
+        INIT_LIST_HEAD(&node->children);
+        INIT_LIST_HEAD(&node->all);
+        node->info = info;
+        node->parent = parent;
+        if (name)
+                strcpy(node->name, name);
+}
+
+/*
+ * Create a new node and associated debugfs entry. Needs to be called with
+ * node_lock held.
+ */
+static struct gcov_node *new_node(struct gcov_node *parent,
+                                  struct gcov_info *info, const char *name)
+{
+        struct gcov_node *node;
+
+        node = kzalloc(sizeof(struct gcov_node) + strlen(name) + 1, GFP_KERNEL);
+        if (!node) {
+                pr_warning("out of memory\n");
+                return NULL;
+        }
+        init_node(node, info, name, parent);
+        /* Differentiate between gcov data file nodes and directory nodes. */
+        if (info) {
+                node->dentry = debugfs_create_file(deskew(node->name), 0600,
+                                        parent->dentry, node, &gcov_data_fops);
+        } else
+                node->dentry = debugfs_create_dir(node->name, parent->dentry);
+        if (!node->dentry) {
+                pr_warning("could not create file\n");
+                kfree(node);
+                return NULL;
+        }
+        if (info)
+                add_links(node, parent->dentry);
+        list_add(&node->list, &parent->children);
+        list_add(&node->all, &all_head);
+
+        return node;
+}
+
+/* Remove symbolic links associated with node. */
+static void remove_links(struct gcov_node *node)
+{
+        int i;
+
+        if (!node->links)
+                return;
+        for (i = 0; gcov_link[i].ext; i++)
+                debugfs_remove(node->links[i]);
+        kfree(node->links);
+        node->links = NULL;
+}
+
+/*
+ * Remove node from all lists and debugfs and release associated resources.
+ * Needs to be called with node_lock held.
+ */
+static void release_node(struct gcov_node *node)
+{
+        list_del(&node->list);
+        list_del(&node->all);
+        debugfs_remove(node->dentry);
+        remove_links(node);
+        if (node->ghost)
+                gcov_info_free(node->ghost);
+        kfree(node);
+}
+
+/* Release node and empty parents. Needs to be called with node_lock held. */
+static void remove_node(struct gcov_node *node)
+{
+        struct gcov_node *parent;
+
+        while ((node != &root_node) && list_empty(&node->children)) {
+                parent = node->parent;
+                release_node(node);
+                node = parent;
+        }
+}
+
+/*
+ * Find child node with given basename. Needs to be called with node_lock
+ * held.
+ */
+static struct gcov_node *get_child_by_name(struct gcov_node *parent,
+                                           const char *name)
+{
+        struct gcov_node *node;
+
+        list_for_each_entry(node, &parent->children, list) {
+                if (strcmp(node->name, name) == 0)
+                        return node;
+        }
+
+        return NULL;
+}
+
+/*
+ * write() implementation for reset file. Reset all profiling data to zero
+ * and remove ghost nodes.
+ */
+static ssize_t reset_write(struct file *file, const char __user *addr,
+                           size_t len, loff_t *pos)
+{
+        struct gcov_node *node;
+
+        mutex_lock(&node_lock);
+restart:
+        list_for_each_entry(node, &all_head, all) {
+                if (node->info)
+                        gcov_info_reset(node->info);
+                else if (list_empty(&node->children)) {
+                        remove_node(node);
+                        /* Several nodes may have gone - restart loop. */
+                        goto restart;
+                }
+        }
+        mutex_unlock(&node_lock);
+
+        return len;
+}
+
+/* read() implementation for reset file. Unused. */
+static ssize_t reset_read(struct file *file, char __user *addr, size_t len,
+                          loff_t *pos)
+{
+        /* Allow read operation so that a recursive copy won't fail. */
+        return 0;
+}
+
+static const struct file_operations gcov_reset_fops = {
+        .write  = reset_write,
+        .read   = reset_read,
+};
+
+/*
+ * Create a node for a given profiling data set and add it to all lists and
+ * debugfs. Needs to be called with node_lock held.
+ */
+static void add_node(struct gcov_info *info)
+{
+        char *filename;
+        char *curr;
+        char *next;
+        struct gcov_node *parent;
+        struct gcov_node *node;
+
+        filename = kstrdup(info->filename, GFP_KERNEL);
+        if (!filename)
+                return;
+        parent = &root_node;
+        /* Create directory nodes along the path. */
+        for (curr = filename; (next = strchr(curr, '/')); curr = next + 1) {
+                if (curr == next)
+                        continue;
+                *next = 0;
+                if (strcmp(curr, ".") == 0)
+                        continue;
+                if (strcmp(curr, "..") == 0) {
+                        if (!parent->parent)
+                                goto err_remove;
+                        parent = parent->parent;
+                        continue;
+                }
+                node = get_child_by_name(parent, curr);
+                if (!node) {
+                        node = new_node(parent, NULL, curr);
+                        if (!node)
+                                goto err_remove;
+                }
+                parent = node;
+        }
+        /* Create file node. */
+        node = new_node(parent, info, curr);
+        if (!node)
+                goto err_remove;
+out:
+        kfree(filename);
+        return;
+
+err_remove:
+        remove_node(parent);
+        goto out;
+}
+
+/*
+ * The profiling data set associated with this node is being unloaded. Store a
+ * copy of the profiling data and turn this node into a "ghost".
+ */
+static int ghost_node(struct gcov_node *node)
+{
+        node->ghost = gcov_info_dup(node->info);
+        if (!node->ghost) {
+                pr_warning("could not save data for '%s' (out of memory)\n",
+                           node->info->filename);
+                return -ENOMEM;
+        }
+        node->info = NULL;
+
+        return 0;
+}
+
+/*
+ * Profiling data for this node has been loaded again. Add profiling data
+ * from previous instantiation and turn this node into a regular node.
+ */
+static void revive_node(struct gcov_node *node, struct gcov_info *info)
+{
+        if (gcov_info_is_compatible(node->ghost, info))
+                gcov_info_add(info, node->ghost);
+        else {
+                pr_warning("discarding saved data for '%s' (version changed)\n",
+                           info->filename);
+        }
+        gcov_info_free(node->ghost);
+        node->ghost = NULL;
+        node->info = info;
+}
+
+/*
+ * Callback to create/remove profiling files when code compiled with
+ * -fprofile-arcs is loaded/unloaded.
+ */
+void gcov_event(enum gcov_action action, struct gcov_info *info)
+{
+        struct gcov_node *node;
+
+        mutex_lock(&node_lock);
+        node = get_node_by_name(info->filename);
+        switch (action) {
+        case GCOV_ADD:
+                /* Add new node or revive ghost. */
+                if (!node) {
+                        add_node(info);
+                        break;
+                }
+                if (gcov_persist)
+                        revive_node(node, info);
+                else {
+                        pr_warning("could not add '%s' (already exists)\n",
+                                   info->filename);
+                }
+                break;
+        case GCOV_REMOVE:
+                /* Remove node or turn into ghost. */
+                if (!node) {
+                        pr_warning("could not remove '%s' (not found)\n",
+                                   info->filename);
+                        break;
+                }
+                if (gcov_persist) {
+                        if (!ghost_node(node))
+                                break;
+                }
+                remove_node(node);
+                break;
+        }
+        mutex_unlock(&node_lock);
+}
+
+/* Create debugfs entries. */
+static __init int gcov_fs_init(void)
+{
+        int rc = -EIO;
+
+        init_node(&root_node, NULL, NULL, NULL);
+        /*
+         * /sys/kernel/debug/gcov will be parent for the reset control file
+         * and all profiling files.
+         */
+        root_node.dentry = debugfs_create_dir("gcov", NULL);
+        if (!root_node.dentry)
+                goto err_remove;
+        /*
+         * Create reset file which resets all profiling counts when written
+         * to.
+         */
+        reset_dentry = debugfs_create_file("reset", 0600, root_node.dentry,
+                                           NULL, &gcov_reset_fops);
+        if (!reset_dentry)
+                goto err_remove;
+        /* Replay previous events to get our fs hierarchy up-to-date. */
+        gcov_enable_events();
+        return 0;
+
+err_remove:
+        pr_err("init failed\n");
+        if (root_node.dentry)
+                debugfs_remove(root_node.dentry);
+
+        return rc;
+}
+device_initcall(gcov_fs_init);
diff --git a/kernel/gcov/gcc_3_4.c b/kernel/gcov/gcc_3_4.c
new file mode 100644
index 000000000000..ae5bb4260033
--- /dev/null
+++ b/kernel/gcov/gcc_3_4.c
@@ -0,0 +1,447 @@
+/*
+ *  This code provides functions to handle gcc's profiling data format
+ *  introduced with gcc 3.4. Future versions of gcc may change the gcov
+ *  format (as happened before), so all format-specific information needs
+ *  to be kept modular and easily exchangeable.
+ *
+ *  This file is based on gcc-internal definitions. Functions and data
+ *  structures are defined to be compatible with gcc counterparts.
+ *  For a better understanding, refer to gcc source: gcc/gcov-io.h.
+ *
+ *    Copyright IBM Corp. 2009
+ *    Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
+ *
+ *    Uses gcc-internal data definitions.
+ */
+
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/seq_file.h>
+#include <linux/vmalloc.h>
+#include "gcov.h"
+
+/* Symbolic links to be created for each profiling data file. */
+const struct gcov_link gcov_link[] = {
+        { OBJ_TREE, "gcno" },   /* Link to .gcno file in $(objtree). */
+        { 0, NULL},
+};
+
+/*
+ * Determine whether a counter is active. Based on gcc magic. Doesn't change
+ * at run-time.
+ */
+static int counter_active(struct gcov_info *info, unsigned int type)
+{
+        return (1 << type) & info->ctr_mask;
+}
+
+/* Determine number of active counters. Based on gcc magic. */
+static unsigned int num_counter_active(struct gcov_info *info)
+{
+        unsigned int i;
+        unsigned int result = 0;
+
+        for (i = 0; i < GCOV_COUNTERS; i++) {
+                if (counter_active(info, i))
+                        result++;
+        }
+        return result;
+}
+
+/**
+ * gcov_info_reset - reset profiling data to zero
+ * @info: profiling data set
+ */
+void gcov_info_reset(struct gcov_info *info)
+{
+        unsigned int active = num_counter_active(info);
+        unsigned int i;
+
+        for (i = 0; i < active; i++) {
+                memset(info->counts[i].values, 0,
+                       info->counts[i].num * sizeof(gcov_type));
+        }
+}
+
+/**
+ * gcov_info_is_compatible - check if profiling data can be added
+ * @info1: first profiling data set
+ * @info2: second profiling data set
+ *
+ * Returns non-zero if profiling data can be added, zero otherwise.
+ */
+int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2)
+{
+        return (info1->stamp == info2->stamp);
+}
+
+/**
+ * gcov_info_add - add up profiling data
+ * @dest: profiling data set to which data is added
+ * @source: profiling data set which is added
+ *
+ * Adds profiling counts of @source to @dest.
+ */
+void gcov_info_add(struct gcov_info *dest, struct gcov_info *source)
+{
+        unsigned int i;
+        unsigned int j;
+
+        for (i = 0; i < num_counter_active(dest); i++) {
+                for (j = 0; j < dest->counts[i].num; j++) {
+                        dest->counts[i].values[j] +=
+                                source->counts[i].values[j];
+                }
+        }
+}
+
+/* Get size of function info entry. Based on gcc magic. */
+static size_t get_fn_size(struct gcov_info *info)
+{
+        size_t size;
+
+        size = sizeof(struct gcov_fn_info) + num_counter_active(info) *
+               sizeof(unsigned int);
+        if (__alignof__(struct gcov_fn_info) > sizeof(unsigned int))
+                size = ALIGN(size, __alignof__(struct gcov_fn_info));
+        return size;
+}
+
+/* Get address of function info entry. Based on gcc magic. */
+static struct gcov_fn_info *get_fn_info(struct gcov_info *info, unsigned int fn)
+{
+        return (struct gcov_fn_info *)
+                ((char *) info->functions + fn * get_fn_size(info));
+}
+
+/**
+ * gcov_info_dup - duplicate profiling data set
+ * @info: profiling data set to duplicate
+ *
+ * Return newly allocated duplicate on success, %NULL on error.
+ */
+struct gcov_info *gcov_info_dup(struct gcov_info *info)
+{
+        struct gcov_info *dup;
+        unsigned int i;
+        unsigned int active;
+
+        /* Duplicate gcov_info. */
+        active = num_counter_active(info);
+        dup = kzalloc(sizeof(struct gcov_info) +
+                      sizeof(struct gcov_ctr_info) * active, GFP_KERNEL);
+        if (!dup)
+                return NULL;
+        dup->version            = info->version;
+        dup->stamp              = info->stamp;
+        dup->n_functions        = info->n_functions;
+        dup->ctr_mask           = info->ctr_mask;
+        /* Duplicate filename. */
+        dup->filename           = kstrdup(info->filename, GFP_KERNEL);
+        if (!dup->filename)
+                goto err_free;
+        /* Duplicate table of functions. */
+        dup->functions = kmemdup(info->functions, info->n_functions *
+                                 get_fn_size(info), GFP_KERNEL);
+        if (!dup->functions)
+                goto err_free;
+        /* Duplicate counter arrays. */
+        for (i = 0; i < active ; i++) {
+                struct gcov_ctr_info *ctr = &info->counts[i];
+                size_t size = ctr->num * sizeof(gcov_type);
+
+                dup->counts[i].num = ctr->num;
+                dup->counts[i].merge = ctr->merge;
+                dup->counts[i].values = vmalloc(size);
+                if (!dup->counts[i].values)
+                        goto err_free;
+                memcpy(dup->counts[i].values, ctr->values, size);
+        }
+        return dup;
+
+err_free:
+        gcov_info_free(dup);
+        return NULL;
+}
+
+/**
+ * gcov_info_free - release memory for profiling data set duplicate
+ * @info: profiling data set duplicate to free
+ */
+void gcov_info_free(struct gcov_info *info)
+{
+        unsigned int active = num_counter_active(info);
+        unsigned int i;
+
+        for (i = 0; i < active ; i++)
+                vfree(info->counts[i].values);
+        kfree(info->functions);
+        kfree(info->filename);
+        kfree(info);
+}
+
+/**
+ * struct type_info - iterator helper array
+ * @ctr_type: counter type
+ * @offset: index of the first value of the current function for this type
+ *
+ * This array is needed to convert the in-memory data format into the in-file
+ * data format:
+ *
+ * In-memory:
+ *   for each counter type
+ *     for each function
+ *       values
+ *
+ * In-file:
+ *   for each function
+ *     for each counter type
+ *       values
+ *
+ * See gcc source gcc/gcov-io.h for more information on data organization.
+ */
+struct type_info {
+        int ctr_type;
+        unsigned int offset;
+};
+
+/**
+ * struct gcov_iterator - specifies current file position in logical records
+ * @info: associated profiling data
+ * @record: record type
+ * @function: function number
+ * @type: counter type
+ * @count: index into values array
+ * @num_types: number of counter types
+ * @type_info: helper array to get values-array offset for current function
+ */
+struct gcov_iterator {
+        struct gcov_info *info;
+
+        int record;
+        unsigned int function;
+        unsigned int type;
+        unsigned int count;
+
+        int num_types;
+        struct type_info type_info[0];
+};
+
+static struct gcov_fn_info *get_func(struct gcov_iterator *iter)
+{
+        return get_fn_info(iter->info, iter->function);
+}
+
+static struct type_info *get_type(struct gcov_iterator *iter)
+{
+        return &iter->type_info[iter->type];
+}
+
+/**
+ * gcov_iter_new - allocate and initialize profiling data iterator
+ * @info: profiling data set to be iterated
+ *
+ * Return file iterator on success, %NULL otherwise.
+ */
+struct gcov_iterator *gcov_iter_new(struct gcov_info *info)
+{
+        struct gcov_iterator *iter;
+
+        iter = kzalloc(sizeof(struct gcov_iterator) +
+                       num_counter_active(info) * sizeof(struct type_info),
+                       GFP_KERNEL);
+        if (iter)
+                iter->info = info;
+
+        return iter;
+}
+
+/**
+ * gcov_iter_free - release memory for iterator
+ * @iter: file iterator to free
+ */
+void gcov_iter_free(struct gcov_iterator *iter)
+{
+        kfree(iter);
+}
+
+/**
+ * gcov_iter_get_info - return profiling data set for given file iterator
+ * @iter: file iterator
+ */
+struct gcov_info *gcov_iter_get_info(struct gcov_iterator *iter)
+{
+        return iter->info;
+}
+
+/**
+ * gcov_iter_start - reset file iterator to starting position
+ * @iter: file iterator
+ */
+void gcov_iter_start(struct gcov_iterator *iter)
+{
+        int i;
+
+        iter->record = 0;
+        iter->function = 0;
+        iter->type = 0;
+        iter->count = 0;
+        iter->num_types = 0;
+        for (i = 0; i < GCOV_COUNTERS; i++) {
+                if (counter_active(iter->info, i)) {
+                        iter->type_info[iter->num_types].ctr_type = i;
+                        iter->type_info[iter->num_types++].offset = 0;
+                }
+        }
+}
+
+/* Mapping of logical record number to actual file content. */
+#define RECORD_FILE_MAGIC       0
+#define RECORD_GCOV_VERSION     1
+#define RECORD_TIME_STAMP       2
+#define RECORD_FUNCTION_TAG     3
+#define RECORD_FUNCTON_TAG_LEN  4
+#define RECORD_FUNCTION_IDENT   5
+#define RECORD_FUNCTION_CHECK   6
+#define RECORD_COUNT_TAG        7
+#define RECORD_COUNT_LEN        8
+#define RECORD_COUNT            9
+
+/**
+ * gcov_iter_next - advance file iterator to next logical record
+ * @iter: file iterator
+ *
+ * Return zero if new position is valid, non-zero if iterator has reached end.
+ */
+int gcov_iter_next(struct gcov_iterator *iter)
+{
+        switch (iter->record) {
+        case RECORD_FILE_MAGIC:
+        case RECORD_GCOV_VERSION:
+        case RECORD_FUNCTION_TAG:
+        case RECORD_FUNCTON_TAG_LEN:
+        case RECORD_FUNCTION_IDENT:
+        case RECORD_COUNT_TAG:
+                /* Advance to next record */
+                iter->record++;
+                break;
+        case RECORD_COUNT:
+                /* Advance to next count */
+                iter->count++;
+                /* fall through */
+        case RECORD_COUNT_LEN:
+                if (iter->count < get_func(iter)->n_ctrs[iter->type]) {
+                        iter->record = 9;
+                        break;
+                }
+                /* Advance to next counter type */
+                get_type(iter)->offset += iter->count;
+                iter->count = 0;
+                iter->type++;
+                /* fall through */
+        case RECORD_FUNCTION_CHECK:
+                if (iter->type < iter->num_types) {
+                        iter->record = 7;
+                        break;
+                }
+                /* Advance to next function */
+                iter->type = 0;
+                iter->function++;
+                /* fall through */
+        case RECORD_TIME_STAMP:
+                if (iter->function < iter->info->n_functions)
+                        iter->record = 3;
+                else
+                        iter->record = -1;
+                break;
+        }
+        /* Check for EOF. */
+        if (iter->record == -1)
+                return -EINVAL;
+        else
+                return 0;
+}
+
+/**
+ * seq_write_gcov_u32 - write 32 bit number in gcov format to seq_file
+ * @seq: seq_file handle
+ * @v: value to be stored
+ *
+ * Number format defined by gcc: numbers are recorded in the 32 bit
+ * unsigned binary form of the endianness of the machine generating the
+ * file.
+ */
+static int seq_write_gcov_u32(struct seq_file *seq, u32 v)
+{
+        return seq_write(seq, &v, sizeof(v));
+}
+
+/**
+ * seq_write_gcov_u64 - write 64 bit number in gcov format to seq_file
+ * @seq: seq_file handle
+ * @v: value to be stored
+ *
+ * Number format defined by gcc: numbers are recorded in the 32 bit
+ * unsigned binary form of the endianness of the machine generating the
+ * file. 64 bit numbers are stored as two 32 bit numbers, the low part
+ * first.
+ */
+static int seq_write_gcov_u64(struct seq_file *seq, u64 v)
+{
+        u32 data[2];
+
+        data[0] = (v & 0xffffffffUL);
+        data[1] = (v >> 32);
+        return seq_write(seq, data, sizeof(data));
+}
+
+/**
+ * gcov_iter_write - write data for current pos to seq_file
+ * @iter: file iterator
+ * @seq: seq_file handle
+ *
+ * Return zero on success, non-zero otherwise.
+ */
+int gcov_iter_write(struct gcov_iterator *iter, struct seq_file *seq)
+{
+        int rc = -EINVAL;
+
+        switch (iter->record) {
+        case RECORD_FILE_MAGIC:
+                rc = seq_write_gcov_u32(seq, GCOV_DATA_MAGIC);
+                break;
+        case RECORD_GCOV_VERSION:
+                rc = seq_write_gcov_u32(seq, iter->info->version);
+                break;
+        case RECORD_TIME_STAMP:
+                rc = seq_write_gcov_u32(seq, iter->info->stamp);
+                break;
+        case RECORD_FUNCTION_TAG:
+                rc = seq_write_gcov_u32(seq, GCOV_TAG_FUNCTION);
+                break;
+        case RECORD_FUNCTON_TAG_LEN:
+                rc = seq_write_gcov_u32(seq, 2);
+                break;
+        case RECORD_FUNCTION_IDENT:
+                rc = seq_write_gcov_u32(seq, get_func(iter)->ident);
+                break;
+        case RECORD_FUNCTION_CHECK:
+                rc = seq_write_gcov_u32(seq, get_func(iter)->checksum);
+                break;
+        case RECORD_COUNT_TAG:
+                rc = seq_write_gcov_u32(seq,
+                        GCOV_TAG_FOR_COUNTER(get_type(iter)->ctr_type));
+                break;
+        case RECORD_COUNT_LEN:
+                rc = seq_write_gcov_u32(seq,
+                                get_func(iter)->n_ctrs[iter->type] * 2);
+                break;
+        case RECORD_COUNT:
+                rc = seq_write_gcov_u64(seq,
+                        iter->info->counts[iter->type].
+                                values[iter->count + get_type(iter)->offset]);
+                break;
+        }
+        return rc;
+}
diff --git a/kernel/gcov/gcov.h b/kernel/gcov/gcov.h
new file mode 100644
index 000000000000..060073ebf7a6
--- /dev/null
+++ b/kernel/gcov/gcov.h
@@ -0,0 +1,128 @@
+/*
+ *  Profiling infrastructure declarations.
+ *
+ *  This file is based on gcc-internal definitions. Data structures are
+ *  defined to be compatible with gcc counterparts. For a better
+ *  understanding, refer to gcc source: gcc/gcov-io.h.
+ *
+ *    Copyright IBM Corp. 2009
+ *    Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
+ *
+ *    Uses gcc-internal data definitions.
+ */
+
+#ifndef GCOV_H
+#define GCOV_H GCOV_H
+
+#include <linux/types.h>
+
+/*
+ * Profiling data types used for gcc 3.4 and above - these are defined by
+ * gcc and need to be kept as close to the original definition as possible to
+ * remain compatible.
+ */
+#define GCOV_COUNTERS           5
+#define GCOV_DATA_MAGIC         ((unsigned int) 0x67636461)
+#define GCOV_TAG_FUNCTION       ((unsigned int) 0x01000000)
+#define GCOV_TAG_COUNTER_BASE   ((unsigned int) 0x01a10000)
+#define GCOV_TAG_FOR_COUNTER(count)                                     \
+        (GCOV_TAG_COUNTER_BASE + ((unsigned int) (count) << 17))
+
+#if BITS_PER_LONG >= 64
+typedef long gcov_type;
+#else
+typedef long long gcov_type;
+#endif
+
+/**
+ * struct gcov_fn_info - profiling meta data per function
+ * @ident: object file-unique function identifier
+ * @checksum: function checksum
+ * @n_ctrs: number of values per counter type belonging to this function
+ *
+ * This data is generated by gcc during compilation and doesn't change
+ * at run-time.
+ */
+struct gcov_fn_info {
+        unsigned int ident;
+        unsigned int checksum;
+        unsigned int n_ctrs[0];
+};
+
+/**
+ * struct gcov_ctr_info - profiling data per counter type
+ * @num: number of counter values for this type
+ * @values: array of counter values for this type
+ * @merge: merge function for counter values of this type (unused)
+ *
+ * This data is generated by gcc during compilation and doesn't change
+ * at run-time with the exception of the values array.
+ */
+struct gcov_ctr_info {
+        unsigned int    num;
+        gcov_type       *values;
+        void            (*merge)(gcov_type *, unsigned int);
+};
+
+/**
+ * struct gcov_info - profiling data per object file
+ * @version: gcov version magic indicating the gcc version used for compilation
+ * @next: list head for a singly-linked list
+ * @stamp: time stamp
+ * @filename: name of the associated gcov data file
+ * @n_functions: number of instrumented functions
+ * @functions: function data
+ * @ctr_mask: mask specifying which counter types are active
+ * @counts: counter data per counter type
+ *
+ * This data is generated by gcc during compilation and doesn't change
+ * at run-time with the exception of the next pointer.
+ */
+struct gcov_info {
+        unsigned int                    version;
+        struct gcov_info                *next;
+        unsigned int                    stamp;
+        const char                      *filename;
+        unsigned int                    n_functions;
+        const struct gcov_fn_info       *functions;
+        unsigned int                    ctr_mask;
+        struct gcov_ctr_info            counts[0];
+};
+
+/* Base interface. */
+enum gcov_action {
+        GCOV_ADD,
+        GCOV_REMOVE,
+};
+
+void gcov_event(enum gcov_action action, struct gcov_info *info);
+void gcov_enable_events(void);
+
+/* Iterator control. */
+struct seq_file;
+struct gcov_iterator;
+
+struct gcov_iterator *gcov_iter_new(struct gcov_info *info);
+void gcov_iter_free(struct gcov_iterator *iter);
+void gcov_iter_start(struct gcov_iterator *iter);
+int gcov_iter_next(struct gcov_iterator *iter);
+int gcov_iter_write(struct gcov_iterator *iter, struct seq_file *seq);
+struct gcov_info *gcov_iter_get_info(struct gcov_iterator *iter);
+
+/* gcov_info control. */
+void gcov_info_reset(struct gcov_info *info);
+int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2);
+void gcov_info_add(struct gcov_info *dest, struct gcov_info *source);
+struct gcov_info *gcov_info_dup(struct gcov_info *info);
+void gcov_info_free(struct gcov_info *info);
+
+struct gcov_link {
+        enum {
+                OBJ_TREE,
+                SRC_TREE,
+        } dir;
+        const char *ext;
+};
+extern const struct gcov_link gcov_link[];
+
+#endif /* GCOV_H */
diff --git a/kernel/groups.c b/kernel/groups.c
new file mode 100644
index 000000000000..2b45b2ee3964
--- /dev/null
+++ b/kernel/groups.c
@@ -0,0 +1,288 @@
+/*
+ * Supplementary group IDs
+ */
+#include <linux/cred.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/security.h>
+#include <linux/syscalls.h>
+#include <asm/uaccess.h>
+
+/* init to 2 - one for init_task, one to ensure it is never freed */
+struct group_info init_groups = { .usage = ATOMIC_INIT(2) };
+
+struct group_info *groups_alloc(int gidsetsize)
+{
+        struct group_info *group_info;
+        int nblocks;
+        int i;
+
+        nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK;
+        /* Make sure we always allocate at least one indirect block pointer */
+        nblocks = nblocks ? : 1;
+        group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER);
+        if (!group_info)
+                return NULL;
+        group_info->ngroups = gidsetsize;
+        group_info->nblocks = nblocks;
+        atomic_set(&group_info->usage, 1);
+
+        if (gidsetsize <= NGROUPS_SMALL)
+                group_info->blocks[0] = group_info->small_block;
+        else {
+                for (i = 0; i < nblocks; i++) {
+                        gid_t *b;
+                        b = (void *)__get_free_page(GFP_USER);
+                        if (!b)
+                                goto out_undo_partial_alloc;
+                        group_info->blocks[i] = b;
+                }
+        }
+        return group_info;
+
+out_undo_partial_alloc:
+        while (--i >= 0) {
+                free_page((unsigned long)group_info->blocks[i]);
+        }
+        kfree(group_info);
+        return NULL;
+}
+
+EXPORT_SYMBOL(groups_alloc);
+
+void groups_free(struct group_info *group_info)
+{
+        if (group_info->blocks[0] != group_info->small_block) {
+                int i;
+                for (i = 0; i < group_info->nblocks; i++)
+                        free_page((unsigned long)group_info->blocks[i]);
+        }
+        kfree(group_info);
+}
+
+EXPORT_SYMBOL(groups_free);
+
+/* export the group_info to a user-space array */
+static int groups_to_user(gid_t __user *grouplist,
+                          const struct group_info *group_info)
+{
+        int i;
+        unsigned int count = group_info->ngroups;
+
+        for (i = 0; i < group_info->nblocks; i++) {
+                unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);
+                unsigned int len = cp_count * sizeof(*grouplist);
+
+                if (copy_to_user(grouplist, group_info->blocks[i], len))
+                        return -EFAULT;
+
+                grouplist += NGROUPS_PER_BLOCK;
+                count -= cp_count;
+        }
+        return 0;
+}
+
+/* fill a group_info from a user-space array - it must be allocated already */
+static int groups_from_user(struct group_info *group_info,
+    gid_t __user *grouplist)
+{
+        int i;
+        unsigned int count = group_info->ngroups;
+
+        for (i = 0; i < group_info->nblocks; i++) {
+                unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);
+                unsigned int len = cp_count * sizeof(*grouplist);
+
+                if (copy_from_user(group_info->blocks[i], grouplist, len))
+                        return -EFAULT;
+
+                grouplist += NGROUPS_PER_BLOCK;
+                count -= cp_count;
+        }
+        return 0;
+}
+
+/* a simple Shell sort */
+static void groups_sort(struct group_info *group_info)
+{
+        int base, max, stride;
+        int gidsetsize = group_info->ngroups;
+
+        for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1)
+                ; /* nothing */
+        stride /= 3;
+
+        while (stride) {
+                max = gidsetsize - stride;
+                for (base = 0; base < max; base++) {
+                        int left = base;
+                        int right = left + stride;
+                        gid_t tmp = GROUP_AT(group_info, right);
+
+                        while (left >= 0 && GROUP_AT(group_info, left) > tmp) {
+                                GROUP_AT(group_info, right) =
+                                    GROUP_AT(group_info, left);
+                                right = left;
+                                left -= stride;
+                        }
+                        GROUP_AT(group_info, right) = tmp;
+                }
+                stride /= 3;
+        }
+}
+
+/* a simple bsearch */
+int groups_search(const struct group_info *group_info, gid_t grp)
+{
+        unsigned int left, right;
+
+        if (!group_info)
+                return 0;
+
+        left = 0;
+        right = group_info->ngroups;
+        while (left < right) {
+                unsigned int mid = (left+right)/2;
+                int cmp = grp - GROUP_AT(group_info, mid);
+                if (cmp > 0)
+                        left = mid + 1;
+                else if (cmp < 0)
+                        right = mid;
+                else
+                        return 1;
+        }
+        return 0;
+}
+
+/**
+ * set_groups - Change a group subscription in a set of credentials
+ * @new: The newly prepared set of credentials to alter
+ * @group_info: The group list to install
+ *
+ * Validate a group subscription and, if valid, insert it into a set
+ * of credentials.
+ */
+int set_groups(struct cred *new, struct group_info *group_info)
+{
+        int retval;
+
+        retval = security_task_setgroups(group_info);
+        if (retval)
+                return retval;
+
+        put_group_info(new->group_info);
+        groups_sort(group_info);
+        get_group_info(group_info);
+        new->group_info = group_info;
+        return 0;
+}
+
+EXPORT_SYMBOL(set_groups);
+
+/**
+ * set_current_groups - Change current's group subscription
+ * @group_info: The group list to impose
+ *
+ * Validate a group subscription and, if valid, impose it upon current's task
+ * security record.
+ */
+int set_current_groups(struct group_info *group_info)
+{
+        struct cred *new;
+        int ret;
+
+        new = prepare_creds();
+        if (!new)
+                return -ENOMEM;
+
+        ret = set_groups(new, group_info);
+        if (ret < 0) {
+                abort_creds(new);
+                return ret;
+        }
+
+        return commit_creds(new);
+}
+
+EXPORT_SYMBOL(set_current_groups);
+
+SYSCALL_DEFINE2(getgroups, int, gidsetsize, gid_t __user *, grouplist)
+{
+        const struct cred *cred = current_cred();
+        int i;
+
+        if (gidsetsize < 0)
+                return -EINVAL;
+
+        /* no need to grab task_lock here; it cannot change */
+        i = cred->group_info->ngroups;
+        if (gidsetsize) {
+                if (i > gidsetsize) {
+                        i = -EINVAL;
+                        goto out;
+                }
+                if (groups_to_user(grouplist, cred->group_info)) {
+                        i = -EFAULT;
+                        goto out;
+                }
+        }
+out:
+        return i;
+}
+
+/*
+ *      SMP: Our groups are copy-on-write. We can set them safely
+ *      without another task interfering.
+ */
+
+SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, grouplist)
+{
+        struct group_info *group_info;
+        int retval;
+
+        if (!capable(CAP_SETGID))
+                return -EPERM;
+        if ((unsigned)gidsetsize > NGROUPS_MAX)
+                return -EINVAL;
+
+        group_info = groups_alloc(gidsetsize);
+        if (!group_info)
+                return -ENOMEM;
+        retval = groups_from_user(group_info, grouplist);
+        if (retval) {
+                put_group_info(group_info);
+                return retval;
+        }
+
+        retval = set_current_groups(group_info);
+        put_group_info(group_info);
+
+        return retval;
+}
+
+/*
+ * Check whether we're fsgid/egid or in the supplemental group..
+ */
+int in_group_p(gid_t grp)
+{
+        const struct cred *cred = current_cred();
+        int retval = 1;
+
+        if (grp != cred->fsgid)
+                retval = groups_search(cred->group_info, grp);
+        return retval;
+}
+
+EXPORT_SYMBOL(in_group_p);
+
+int in_egroup_p(gid_t grp)
+{
+        const struct cred *cred = current_cred();
+        int retval = 1;
+
+        if (grp != cred->egid)
+                retval = groups_search(cred->group_info, grp);
+        return retval;
+}
+
+EXPORT_SYMBOL(in_egroup_p);
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index cb8a15c19583..9002958a96e7 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -43,6 +43,8 @@
 #include <linux/seq_file.h>
 #include <linux/err.h>
 #include <linux/debugobjects.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
 
 #include <asm/uaccess.h>
 
@@ -193,12 +195,24 @@ struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer,
  * Switch the timer base to the current CPU when possible.
  */
 static inline struct hrtimer_clock_base *
-switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base)
+switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base,
+                    int pinned)
 {
         struct hrtimer_clock_base *new_base;
         struct hrtimer_cpu_base *new_cpu_base;
+        int cpu, preferred_cpu = -1;
+
+        cpu = smp_processor_id();
+#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
+        if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu)) {
+                preferred_cpu = get_nohz_load_balancer();
+                if (preferred_cpu >= 0)
+                        cpu = preferred_cpu;
+        }
+#endif
 
-        new_cpu_base = &__get_cpu_var(hrtimer_bases);
+again:
+        new_cpu_base = &per_cpu(hrtimer_bases, cpu);
         new_base = &new_cpu_base->clock_base[base->index];
 
         if (base != new_base) {
@@ -218,6 +232,40 @@ switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base)
                 timer->base = NULL;
                 spin_unlock(&base->cpu_base->lock);
                 spin_lock(&new_base->cpu_base->lock);
+
+                /* Optimized away for NOHZ=n SMP=n */
+                if (cpu == preferred_cpu) {
+                        /* Calculate clock monotonic expiry time */
+#ifdef CONFIG_HIGH_RES_TIMERS
+                        ktime_t expires = ktime_sub(hrtimer_get_expires(timer),
+                                                        new_base->offset);
+#else
+                        ktime_t expires = hrtimer_get_expires(timer);
+#endif
+
+                        /*
+                         * Get the next event on target cpu from the
+                         * clock events layer.
+                         * This covers the highres=off nohz=on case as well.
+                         */
+                        ktime_t next = clockevents_get_next_event(cpu);
+
+                        ktime_t delta = ktime_sub(expires, next);
+
+                        /*
+                         * We do not migrate the timer when it is expiring
+                         * before the next event on the target cpu because
+                         * we cannot reprogram the target cpu hardware and
+                         * we would cause it to fire late.
+                         */
+                        if (delta.tv64 < 0) {
+                                cpu = smp_processor_id();
+                                spin_unlock(&new_base->cpu_base->lock);
+                                spin_lock(&base->cpu_base->lock);
+                                timer->base = base;
+                                goto again;
+                        }
+                }
                 timer->base = new_base;
         }
         return new_base;
@@ -235,7 +283,7 @@ lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
         return base;
 }
 
-# define switch_hrtimer_base(t, b)      (b)
+# define switch_hrtimer_base(t, b, p)   (b)
 
 #endif  /* !CONFIG_SMP */
 
@@ -332,6 +380,8 @@ ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs)
         return res;
 }
 
+EXPORT_SYMBOL_GPL(ktime_add_safe);
+
 #ifdef CONFIG_DEBUG_OBJECTS_TIMERS
 
 static struct debug_obj_descr hrtimer_debug_descr;
@@ -907,9 +957,9 @@ int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
         ret = remove_hrtimer(timer, base);
 
         /* Switch the timer base, if necessary: */
-        new_base = switch_hrtimer_base(timer, base);
+        new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED);
 
-        if (mode == HRTIMER_MODE_REL) {
+        if (mode & HRTIMER_MODE_REL) {
                 tim = ktime_add_safe(tim, new_base->get_time());
                 /*
                  * CONFIG_TIME_LOW_RES is a temporary way for architectures
diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile
index 3394f8f52964..7d047808419d 100644
--- a/kernel/irq/Makefile
+++ b/kernel/irq/Makefile
@@ -3,5 +3,5 @@ obj-y := handle.o manage.o spurious.o resend.o chip.o devres.o
 obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
 obj-$(CONFIG_PROC_FS) += proc.o
 obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o
-obj-$(CONFIG_NUMA_MIGRATE_IRQ_DESC) += numa_migrate.o
+obj-$(CONFIG_NUMA_IRQ_DESC) += numa_migrate.o
 obj-$(CONFIG_PM_SLEEP) += pm.o
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index c687ba4363f2..13c68e71b726 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -359,7 +359,6 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc)
 
         spin_lock(&desc->lock);
         mask_ack_irq(desc, irq);
-        desc = irq_remap_to_desc(irq, desc);
 
         if (unlikely(desc->status & IRQ_INPROGRESS))
                 goto out_unlock;
@@ -438,7 +437,6 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
         desc->status &= ~IRQ_INPROGRESS;
 out:
         desc->chip->eoi(irq);
-        desc = irq_remap_to_desc(irq, desc);
 
         spin_unlock(&desc->lock);
 }
@@ -475,7 +473,6 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
                     !desc->action)) {
                 desc->status |= (IRQ_PENDING | IRQ_MASKED);
                 mask_ack_irq(desc, irq);
-                desc = irq_remap_to_desc(irq, desc);
                 goto out_unlock;
         }
         kstat_incr_irqs_this_cpu(irq, desc);
@@ -483,7 +480,6 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
         /* Start handling the irq */
         if (desc->chip->ack)
                 desc->chip->ack(irq);
-        desc = irq_remap_to_desc(irq, desc);
 
         /* Mark the IRQ currently in progress.*/
         desc->status |= IRQ_INPROGRESS;
@@ -544,10 +540,8 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
         if (!noirqdebug)
                 note_interrupt(irq, desc, action_ret);
 
-        if (desc->chip->eoi) {
+        if (desc->chip->eoi)
                 desc->chip->eoi(irq);
-                desc = irq_remap_to_desc(irq, desc);
-        }
 }
 
 void
@@ -582,10 +576,8 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 
         /* Uninstall? */
         if (handle == handle_bad_irq) {
-                if (desc->chip != &no_irq_chip) {
+                if (desc->chip != &no_irq_chip)
                         mask_ack_irq(desc, irq);
-                        desc = irq_remap_to_desc(irq, desc);
-                }
                 desc->status |= IRQ_DISABLED;
                 desc->depth = 1;
         }
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 26e08754744f..065205bdd920 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -11,14 +11,15 @@
  */
 
 #include <linux/irq.h>
+#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/random.h>
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>
 #include <linux/rculist.h>
 #include <linux/hash.h>
-#include <trace/irq.h>
 #include <linux/bootmem.h>
+#include <trace/events/irq.h>
 
 #include "internals.h"
 
@@ -44,7 +45,7 @@ void handle_bad_irq(unsigned int irq, struct irq_desc *desc)
 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
 static void __init init_irq_default_affinity(void)
 {
-        alloc_bootmem_cpumask_var(&irq_default_affinity);
+        alloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
         cpumask_setall(irq_default_affinity);
 }
 #else
@@ -81,45 +82,48 @@ static struct irq_desc irq_desc_init = {
         .lock       = __SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
 };
 
-void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr)
+void __ref init_kstat_irqs(struct irq_desc *desc, int node, int nr)
 {
-        int node;
         void *ptr;
 
-        node = cpu_to_node(cpu);
-        ptr = kzalloc_node(nr * sizeof(*desc->kstat_irqs), GFP_ATOMIC, node);
+        if (slab_is_available())
+                ptr = kzalloc_node(nr * sizeof(*desc->kstat_irqs),
+                                   GFP_ATOMIC, node);
+        else
+                ptr = alloc_bootmem_node(NODE_DATA(node),
+                                nr * sizeof(*desc->kstat_irqs));
 
         /*
          * don't overwite if can not get new one
          * init_copy_kstat_irqs() could still use old one
          */
         if (ptr) {
-                printk(KERN_DEBUG "  alloc kstat_irqs on cpu %d node %d\n",
-                         cpu, node);
+                printk(KERN_DEBUG "  alloc kstat_irqs on node %d\n", node);
                 desc->kstat_irqs = ptr;
         }
 }
 
-static void init_one_irq_desc(int irq, struct irq_desc *desc, int cpu)
+static void init_one_irq_desc(int irq, struct irq_desc *desc, int node)
 {
         memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
 
         spin_lock_init(&desc->lock);
         desc->irq = irq;
 #ifdef CONFIG_SMP
-        desc->cpu = cpu;
+        desc->node = node;
 #endif
         lockdep_set_class(&desc->lock, &irq_desc_lock_class);
-        init_kstat_irqs(desc, cpu, nr_cpu_ids);
+        init_kstat_irqs(desc, node, nr_cpu_ids);
         if (!desc->kstat_irqs) {
                 printk(KERN_ERR "can not alloc kstat_irqs\n");
                 BUG_ON(1);
         }
-        if (!init_alloc_desc_masks(desc, cpu, false)) {
+        if (!alloc_desc_masks(desc, node, false)) {
                 printk(KERN_ERR "can not alloc irq_desc cpumasks\n");
                 BUG_ON(1);
         }
-        arch_init_chip_data(desc, cpu);
+        init_desc_masks(desc);
+        arch_init_chip_data(desc, node);
 }
 
 /*
@@ -146,6 +150,7 @@ int __init early_irq_init(void)
 {
         struct irq_desc *desc;
         int legacy_count;
+        int node;
         int i;
 
         init_irq_default_affinity();
@@ -156,20 +161,21 @@ int __init early_irq_init(void)
 
         desc = irq_desc_legacy;
         legacy_count = ARRAY_SIZE(irq_desc_legacy);
+        node = first_online_node;
 
         /* allocate irq_desc_ptrs array based on nr_irqs */
-        irq_desc_ptrs = alloc_bootmem(nr_irqs * sizeof(void *));
+        irq_desc_ptrs = kcalloc(nr_irqs, sizeof(void *), GFP_NOWAIT);
 
         /* allocate based on nr_cpu_ids */
-        /* FIXME: invert kstat_irgs, and it'd be a per_cpu_alloc'd thing */
-        kstat_irqs_legacy = alloc_bootmem(NR_IRQS_LEGACY * nr_cpu_ids *
-                                          sizeof(int));
+        kstat_irqs_legacy = kzalloc_node(NR_IRQS_LEGACY * nr_cpu_ids *
+                                          sizeof(int), GFP_NOWAIT, node);
 
         for (i = 0; i < legacy_count; i++) {
                 desc[i].irq = i;
                 desc[i].kstat_irqs = kstat_irqs_legacy + i * nr_cpu_ids;
                 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
-                init_alloc_desc_masks(&desc[i], 0, true);
+                alloc_desc_masks(&desc[i], node, true);
+                init_desc_masks(&desc[i]);
                 irq_desc_ptrs[i] = desc + i;
         }
 
@@ -187,11 +193,10 @@ struct irq_desc *irq_to_desc(unsigned int irq)
         return NULL;
 }
 
-struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
+struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
 {
         struct irq_desc *desc;
         unsigned long flags;
-        int node;
 
         if (irq >= nr_irqs) {
                 WARN(1, "irq (%d) >= nr_irqs (%d) in irq_to_desc_alloc\n",
@@ -210,15 +215,17 @@ struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
         if (desc)
                 goto out_unlock;
 
-        node = cpu_to_node(cpu);
-        desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
-        printk(KERN_DEBUG "  alloc irq_desc for %d on cpu %d node %d\n",
-                 irq, cpu, node);
+        if (slab_is_available())
+                desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
+        else
+                desc = alloc_bootmem_node(NODE_DATA(node), sizeof(*desc));
+
+        printk(KERN_DEBUG "  alloc irq_desc for %d on node %d\n", irq, node);
         if (!desc) {
                 printk(KERN_ERR "can not alloc irq_desc\n");
                 BUG_ON(1);
         }
-        init_one_irq_desc(irq, desc, cpu);
+        init_one_irq_desc(irq, desc, node);
 
         irq_desc_ptrs[irq] = desc;
 
@@ -256,7 +263,8 @@ int __init early_irq_init(void)
 
         for (i = 0; i < count; i++) {
                 desc[i].irq = i;
-                init_alloc_desc_masks(&desc[i], 0, true);
+                alloc_desc_masks(&desc[i], 0, true);
+                init_desc_masks(&desc[i]);
                 desc[i].kstat_irqs = kstat_irqs_all[i];
         }
         return arch_early_irq_init();
@@ -267,7 +275,7 @@ struct irq_desc *irq_to_desc(unsigned int irq)
         return (irq < NR_IRQS) ? irq_desc + irq : NULL;
 }
 
-struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
+struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node)
 {
         return irq_to_desc(irq);
 }
@@ -348,9 +356,6 @@ static void warn_no_thread(unsigned int irq, struct irqaction *action)
                "but no thread function available.", irq, action->name);
 }
 
-DEFINE_TRACE(irq_handler_entry);
-DEFINE_TRACE(irq_handler_exit);
-
 /**
  * handle_IRQ_event - irq action chain handler
  * @irq:        the interrupt number
@@ -453,11 +458,8 @@ unsigned int __do_IRQ(unsigned int irq)
                 /*
                  * No locking required for CPU-local interrupts:
                  */
-                if (desc->chip->ack) {
+                if (desc->chip->ack)
                         desc->chip->ack(irq);
-                        /* get new one */
-                        desc = irq_remap_to_desc(irq, desc);
-                }
                 if (likely(!(desc->status & IRQ_DISABLED))) {
                         action_ret = handle_IRQ_event(irq, desc->action);
                         if (!noirqdebug)
@@ -468,10 +470,8 @@ unsigned int __do_IRQ(unsigned int irq)
         }
 
         spin_lock(&desc->lock);
-        if (desc->chip->ack) {
+        if (desc->chip->ack)
                 desc->chip->ack(irq);
-                desc = irq_remap_to_desc(irq, desc);
-        }
         /*
          * REPLAY is when Linux resends an IRQ that was dropped earlier
          * WAITING is used by probe to mark irqs that are being tested
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 01ce20eab38f..73468253143b 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -16,7 +16,7 @@ extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
 extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
 
 extern struct lock_class_key irq_desc_lock_class;
-extern void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr);
+extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
 extern void clear_kstat_irqs(struct irq_desc *desc);
 extern spinlock_t sparse_irq_lock;
 
@@ -42,6 +42,9 @@ static inline void unregister_handler_proc(unsigned int irq,
 
 extern int irq_select_affinity_usr(unsigned int irq);
 
+extern void
+irq_set_thread_affinity(struct irq_desc *desc, const struct cpumask *cpumask);
+
 /*
  * Debugging printout:
  */
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index eb47f8b80557..50da67672901 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -80,7 +80,7 @@ int irq_can_set_affinity(unsigned int irq)
         return 1;
 }
 
-static void
+void
 irq_set_thread_affinity(struct irq_desc *desc, const struct cpumask *cpumask)
 {
         struct irqaction *action = desc->action;
@@ -109,17 +109,22 @@ int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
         spin_lock_irqsave(&desc->lock, flags);
 
 #ifdef CONFIG_GENERIC_PENDING_IRQ
-        if (desc->status & IRQ_MOVE_PCNTXT)
-                desc->chip->set_affinity(irq, cpumask);
+        if (desc->status & IRQ_MOVE_PCNTXT) {
+                if (!desc->chip->set_affinity(irq, cpumask)) {
+                        cpumask_copy(desc->affinity, cpumask);
+                        irq_set_thread_affinity(desc, cpumask);
+                }
+        }
         else {
                 desc->status |= IRQ_MOVE_PENDING;
                 cpumask_copy(desc->pending_mask, cpumask);
         }
 #else
-        cpumask_copy(desc->affinity, cpumask);
-        desc->chip->set_affinity(irq, cpumask);
+        if (!desc->chip->set_affinity(irq, cpumask)) {
+                cpumask_copy(desc->affinity, cpumask);
+                irq_set_thread_affinity(desc, cpumask);
+        }
 #endif
-        irq_set_thread_affinity(desc, cpumask);
         desc->status |= IRQ_AFFINITY_SET;
         spin_unlock_irqrestore(&desc->lock, flags);
         return 0;
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index e05ad9be43b7..cfe767ca1545 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -1,5 +1,8 @@
 
 #include <linux/irq.h>
+#include <linux/interrupt.h>
+
+#include "internals.h"
 
 void move_masked_irq(int irq)
 {
@@ -39,11 +42,12 @@ void move_masked_irq(int irq)
          * masking the irqs.
          */
         if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
-                   < nr_cpu_ids)) {
-                cpumask_and(desc->affinity,
-                            desc->pending_mask, cpu_online_mask);
-                desc->chip->set_affinity(irq, desc->affinity);
-        }
+                   < nr_cpu_ids))
+                if (!desc->chip->set_affinity(irq, desc->pending_mask)) {
+                        cpumask_copy(desc->affinity, desc->pending_mask);
+                        irq_set_thread_affinity(desc, desc->pending_mask);
+                }
+
         cpumask_clear(desc->pending_mask);
 }
 
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
index 44bbdcbaf8d2..2f69bee57bf2 100644
--- a/kernel/irq/numa_migrate.c
+++ b/kernel/irq/numa_migrate.c
@@ -15,9 +15,9 @@
 
 static void init_copy_kstat_irqs(struct irq_desc *old_desc,
                                  struct irq_desc *desc,
-                                 int cpu, int nr)
+                                 int node, int nr)
 {
-        init_kstat_irqs(desc, cpu, nr);
+        init_kstat_irqs(desc, node, nr);
 
         if (desc->kstat_irqs != old_desc->kstat_irqs)
                 memcpy(desc->kstat_irqs, old_desc->kstat_irqs,
@@ -34,20 +34,20 @@ static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc)
 }
 
 static bool init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
-                 struct irq_desc *desc, int cpu)
+                 struct irq_desc *desc, int node)
 {
         memcpy(desc, old_desc, sizeof(struct irq_desc));
-        if (!init_alloc_desc_masks(desc, cpu, false)) {
+        if (!alloc_desc_masks(desc, node, false)) {
                 printk(KERN_ERR "irq %d: can not get new irq_desc cpumask "
                                 "for migration.\n", irq);
                 return false;
         }
         spin_lock_init(&desc->lock);
-        desc->cpu = cpu;
+        desc->node = node;
         lockdep_set_class(&desc->lock, &irq_desc_lock_class);
-        init_copy_kstat_irqs(old_desc, desc, cpu, nr_cpu_ids);
+        init_copy_kstat_irqs(old_desc, desc, node, nr_cpu_ids);
         init_copy_desc_masks(old_desc, desc);
-        arch_init_copy_chip_data(old_desc, desc, cpu);
+        arch_init_copy_chip_data(old_desc, desc, node);
         return true;
 }
 
@@ -59,12 +59,11 @@ static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc)
 }
 
 static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
-                                                int cpu)
+                                                int node)
 {
         struct irq_desc *desc;
         unsigned int irq;
         unsigned long flags;
-        int node;
 
         irq = old_desc->irq;
 
@@ -76,7 +75,6 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
         if (desc && old_desc != desc)
                 goto out_unlock;
 
-        node = cpu_to_node(cpu);
         desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
         if (!desc) {
                 printk(KERN_ERR "irq %d: can not get new irq_desc "
@@ -85,7 +83,7 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
                 desc = old_desc;
                 goto out_unlock;
         }
-        if (!init_copy_one_irq_desc(irq, old_desc, desc, cpu)) {
+        if (!init_copy_one_irq_desc(irq, old_desc, desc, node)) {
                 /* still use old one */
                 kfree(desc);
                 desc = old_desc;
@@ -97,9 +95,7 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
 
         /* free the old one */
         free_one_irq_desc(old_desc, desc);
-        spin_unlock(&old_desc->lock);
         kfree(old_desc);
-        spin_lock(&desc->lock);
 
         return desc;
 
@@ -109,24 +105,14 @@ out_unlock:
         return desc;
 }
 
-struct irq_desc *move_irq_desc(struct irq_desc *desc, int cpu)
+struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
 {
-        int old_cpu;
-        int node, old_node;
-
         /* those all static, do move them */
         if (desc->irq < NR_IRQS_LEGACY)
                 return desc;
 
-        old_cpu = desc->cpu;
-        if (old_cpu != cpu) {
-                node = cpu_to_node(cpu);
-                old_node = cpu_to_node(old_cpu);
-                if (old_node != node)
-                        desc = __real_move_irq_desc(desc, cpu);
-                else
-                        desc->cpu = cpu;
-        }
+        if (desc->node != node)
+                desc = __real_move_irq_desc(desc, node);
 
         return desc;
 }
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 374faf9bfdc7..3a29dbe7898e 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -30,12 +30,16 @@
 #define all_var 0
 #endif
 
-/* These will be re-linked against their real values during the second link stage */
+/*
+ * These will be re-linked against their real values
+ * during the second link stage.
+ */
 extern const unsigned long kallsyms_addresses[] __attribute__((weak));
 extern const u8 kallsyms_names[] __attribute__((weak));
 
-/* tell the compiler that the count isn't in the small data section if the arch
- * has one (eg: FRV)
+/*
+ * Tell the compiler that the count isn't in the small data section if the arch
+ * has one (eg: FRV).
  */
 extern const unsigned long kallsyms_num_syms
 __attribute__((weak, section(".rodata")));
@@ -75,31 +79,37 @@ static int is_ksym_addr(unsigned long addr)
         return is_kernel_text(addr) || is_kernel_inittext(addr);
 }
 
-/* expand a compressed symbol data into the resulting uncompressed string,
-   given the offset to where the symbol is in the compressed stream */
+/*
+ * Expand a compressed symbol data into the resulting uncompressed string,
+ * given the offset to where the symbol is in the compressed stream.
+ */
 static unsigned int kallsyms_expand_symbol(unsigned int off, char *result)
 {
         int len, skipped_first = 0;
         const u8 *tptr, *data;
 
-        /* get the compressed symbol length from the first symbol byte */
+        /* Get the compressed symbol length from the first symbol byte. */
         data = &kallsyms_names[off];
         len = *data;
         data++;
 
-        /* update the offset to return the offset for the next symbol on
-         * the compressed stream */
+        /*
+         * Update the offset to return the offset for the next symbol on
+         * the compressed stream.
+         */
         off += len + 1;
 
-        /* for every byte on the compressed symbol data, copy the table
-           entry for that byte */
-        while(len) {
-                tptr = &kallsyms_token_table[ kallsyms_token_index[*data] ];
+        /*
+         * For every byte on the compressed symbol data, copy the table
+         * entry for that byte.
+         */
+        while (len) {
+                tptr = &kallsyms_token_table[kallsyms_token_index[*data]];
                 data++;
                 len--;
 
                 while (*tptr) {
-                        if(skipped_first) {
+                        if (skipped_first) {
                                 *result = *tptr;
                                 result++;
                         } else
@@ -110,36 +120,46 @@ static unsigned int kallsyms_expand_symbol(unsigned int off, char *result)
 
         *result = '\0';
 
-        /* return to offset to the next symbol */
+        /* Return to offset to the next symbol. */
         return off;
 }
 
-/* get symbol type information. This is encoded as a single char at the
- * begining of the symbol name */
+/*
+ * Get symbol type information. This is encoded as a single char at the
+ * beginning of the symbol name.
+ */
 static char kallsyms_get_symbol_type(unsigned int off)
 {
-        /* get just the first code, look it up in the token table, and return the
-         * first char from this token */
-        return kallsyms_token_table[ kallsyms_token_index[ kallsyms_names[off+1] ] ];
+        /*
+         * Get just the first code, look it up in the token table,
+         * and return the first char from this token.
+         */
+        return kallsyms_token_table[kallsyms_token_index[kallsyms_names[off + 1]]];
 }
 
 
-/* find the offset on the compressed stream given and index in the
- * kallsyms array */
+/*
+ * Find the offset on the compressed stream given and index in the
+ * kallsyms array.
+ */
 static unsigned int get_symbol_offset(unsigned long pos)
 {
         const u8 *name;
         int i;
 
-        /* use the closest marker we have. We have markers every 256 positions,
-         * so that should be close enough */
-        name = &kallsyms_names[ kallsyms_markers[pos>>8] ];
+        /*
+         * Use the closest marker we have. We have markers every 256 positions,
+         * so that should be close enough.
+         */
+        name = &kallsyms_names[kallsyms_markers[pos >> 8]];
 
-        /* sequentially scan all the symbols up to the point we're searching for.
-         * Every symbol is stored in a [<len>][<len> bytes of data] format, so we
-         * just need to add the len to the current pointer for every symbol we
-         * wish to skip */
-        for(i = 0; i < (pos&0xFF); i++)
+        /*
+         * Sequentially scan all the symbols up to the point we're searching
+         * for. Every symbol is stored in a [<len>][<len> bytes of data] format,
+         * so we just need to add the len to the current pointer for every
+         * symbol we wish to skip.
+         */
+        for (i = 0; i < (pos & 0xFF); i++)
                 name = name + (*name) + 1;
 
         return name - kallsyms_names;
@@ -190,7 +210,7 @@ static unsigned long get_symbol_pos(unsigned long addr,
         /* This kernel should never had been booted. */
         BUG_ON(!kallsyms_addresses);
 
-        /* do a binary search on the sorted kallsyms_addresses array */
+        /* Do a binary search on the sorted kallsyms_addresses array. */
         low = 0;
         high = kallsyms_num_syms;
 
@@ -203,15 +223,15 @@ static unsigned long get_symbol_pos(unsigned long addr,
         }
 
         /*
-         * search for the first aliased symbol. Aliased
-         * symbols are symbols with the same address
+         * Search for the first aliased symbol. Aliased
+         * symbols are symbols with the same address.
          */
         while (low && kallsyms_addresses[low-1] == kallsyms_addresses[low])
                 --low;
 
         symbol_start = kallsyms_addresses[low];
 
-        /* Search for next non-aliased symbol */
+        /* Search for next non-aliased symbol. */
         for (i = low + 1; i < kallsyms_num_syms; i++) {
                 if (kallsyms_addresses[i] > symbol_start) {
                         symbol_end = kallsyms_addresses[i];
@@ -219,7 +239,7 @@ static unsigned long get_symbol_pos(unsigned long addr,
                 }
         }
 
-        /* if we found no next symbol, we use the end of the section */
+        /* If we found no next symbol, we use the end of the section. */
         if (!symbol_end) {
                 if (is_kernel_inittext(addr))
                         symbol_end = (unsigned long)_einittext;
@@ -252,10 +272,10 @@ int kallsyms_lookup_size_offset(unsigned long addr, unsigned long *symbolsize,
 
 /*
  * Lookup an address
- * - modname is set to NULL if it's in the kernel
- * - we guarantee that the returned name is valid until we reschedule even if
- *   it resides in a module
- * - we also guarantee that modname will be valid until rescheduled
+ * - modname is set to NULL if it's in the kernel.
+ * - We guarantee that the returned name is valid until we reschedule even if.
+ *   It resides in a module.
+ * - We also guarantee that modname will be valid until rescheduled.
  */
 const char *kallsyms_lookup(unsigned long addr,
                             unsigned long *symbolsize,
@@ -276,7 +296,7 @@ const char *kallsyms_lookup(unsigned long addr,
                 return namebuf;
         }
 
-        /* see if it's in a module */
+        /* See if it's in a module. */
         return module_address_lookup(addr, symbolsize, offset, modname,
                                      namebuf);
 }
@@ -294,7 +314,7 @@ int lookup_symbol_name(unsigned long addr, char *symname)
                 kallsyms_expand_symbol(get_symbol_offset(pos), symname);
                 return 0;
         }
-        /* see if it's in a module */
+        /* See if it's in a module. */
         return lookup_module_symbol_name(addr, symname);
 }
 
@@ -313,7 +333,7 @@ int lookup_symbol_attrs(unsigned long addr, unsigned long *size,
                 modname[0] = '\0';
                 return 0;
         }
-        /* see if it's in a module */
+        /* See if it's in a module. */
         return lookup_module_symbol_attrs(addr, size, offset, modname, name);
 }
 
@@ -342,6 +362,7 @@ int sprint_symbol(char *buffer, unsigned long address)
 
         return len;
 }
+EXPORT_SYMBOL_GPL(sprint_symbol);
 
 /* Look up a kernel symbol and print it to the kernel messages. */
 void __print_symbol(const char *fmt, unsigned long address)
@@ -352,13 +373,13 @@ void __print_symbol(const char *fmt, unsigned long address)
 
         printk(fmt, buffer);
 }
+EXPORT_SYMBOL(__print_symbol);
 
 /* To avoid using get_symbol_offset for every symbol, we carry prefix along. */
-struct kallsym_iter
-{
+struct kallsym_iter {
         loff_t pos;
         unsigned long value;
-        unsigned int nameoff; /* If iterating in core kernel symbols */
+        unsigned int nameoff; /* If iterating in core kernel symbols. */
         char type;
         char name[KSYM_NAME_LEN];
         char module_name[MODULE_NAME_LEN];
@@ -404,7 +425,7 @@ static int update_iter(struct kallsym_iter *iter, loff_t pos)
                 iter->pos = pos;
                 return get_ksymbol_mod(iter);
         }
-        
+
         /* If we're not on the desired position, reset to new position. */
         if (pos != iter->pos)
                 reset_iter(iter, pos);
@@ -439,23 +460,25 @@ static int s_show(struct seq_file *m, void *p)
 {
         struct kallsym_iter *iter = m->private;
 
-        /* Some debugging symbols have no name.  Ignore them. */ 
+        /* Some debugging symbols have no name.  Ignore them. */
         if (!iter->name[0])
                 return 0;
 
         if (iter->module_name[0]) {
                 char type;
 
-                /* Label it "global" if it is exported,
-                 * "local" if not exported. */
+                /*
+                 * Label it "global" if it is exported,
+                 * "local" if not exported.
+                 */
                 type = iter->exported ? toupper(iter->type) :
                                         tolower(iter->type);
                 seq_printf(m, "%0*lx %c %s\t[%s]\n",
-                           (int)(2*sizeof(void*)),
+                           (int)(2 * sizeof(void *)),
                            iter->value, type, iter->name, iter->module_name);
         } else
                 seq_printf(m, "%0*lx %c %s\n",
-                           (int)(2*sizeof(void*)),
+                           (int)(2 * sizeof(void *)),
                            iter->value, iter->type, iter->name);
         return 0;
 }
@@ -469,9 +492,11 @@ static const struct seq_operations kallsyms_op = {
 
 static int kallsyms_open(struct inode *inode, struct file *file)
 {
-        /* We keep iterator in m->private, since normal case is to
+        /*
+         * We keep iterator in m->private, since normal case is to
          * s_start from where we left off, so we avoid doing
-         * using get_symbol_offset for every symbol */
+         * using get_symbol_offset for every symbol.
+         */
         struct kallsym_iter *iter;
         int ret;
 
@@ -500,7 +525,4 @@ static int __init kallsyms_init(void)
         proc_create("kallsyms", 0444, NULL, &kallsyms_operations);
         return 0;
 }
-__initcall(kallsyms_init);
-
-EXPORT_SYMBOL(__print_symbol);
-EXPORT_SYMBOL_GPL(sprint_symbol);
+device_initcall(kallsyms_init);
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 5a758c6e4950..ae1c35201cc8 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1448,18 +1448,17 @@ int kernel_kexec(void)
                         goto Restore_console;
                 }
                 suspend_console();
-                error = device_suspend(PMSG_FREEZE);
+                error = dpm_suspend_start(PMSG_FREEZE);
                 if (error)
                         goto Resume_console;
-                device_pm_lock();
-                /* At this point, device_suspend() has been called,
-                 * but *not* device_power_down(). We *must*
-                 * device_power_down() now.  Otherwise, drivers for
+                /* At this point, dpm_suspend_start() has been called,
+                 * but *not* dpm_suspend_noirq(). We *must* call
+                 * dpm_suspend_noirq() now.  Otherwise, drivers for
                  * some devices (e.g. interrupt controllers) become
                  * desynchronized with the actual state of the
                  * hardware at resume time, and evil weirdness ensues.
                  */
-                error = device_power_down(PMSG_FREEZE);
+                error = dpm_suspend_noirq(PMSG_FREEZE);
                 if (error)
                         goto Resume_devices;
                 error = disable_nonboot_cpus();
@@ -1487,10 +1486,9 @@ int kernel_kexec(void)
                 local_irq_enable();
  Enable_cpus:
                 enable_nonboot_cpus();
-                device_power_up(PMSG_RESTORE);
+                dpm_resume_noirq(PMSG_RESTORE);
  Resume_devices:
-                device_pm_unlock();
-                device_resume(PMSG_RESTORE);
+                dpm_resume_end(PMSG_RESTORE);
  Resume_console:
                 resume_console();
                 thaw_processes();
diff --git a/kernel/kfifo.c b/kernel/kfifo.c
index bc41ad0f24f8..26539e3228e5 100644
--- a/kernel/kfifo.c
+++ b/kernel/kfifo.c
@@ -72,9 +72,9 @@ struct kfifo *kfifo_alloc(unsigned int size, gfp_t gfp_mask, spinlock_t *lock)
 
         /*
          * round up to the next power of 2, since our 'let the indices
-         * wrap' tachnique works only in this case.
+         * wrap' technique works only in this case.
          */
-        if (size & (size - 1)) {
+        if (!is_power_of_2(size)) {
                 BUG_ON(size > 0x80000000);
                 size = roundup_pow_of_two(size);
         }
diff --git a/kernel/kgdb.c b/kernel/kgdb.c
index e4dcfb2272a4..9147a3190c9d 100644
--- a/kernel/kgdb.c
+++ b/kernel/kgdb.c
@@ -1583,8 +1583,8 @@ static void sysrq_handle_gdb(int key, struct tty_struct *tty)
 
 static struct sysrq_key_op sysrq_gdb_op = {
         .handler        = sysrq_handle_gdb,
-        .help_msg       = "Gdb",
-        .action_msg     = "GDB",
+        .help_msg       = "debug(G)",
+        .action_msg     = "DEBUG",
 };
 #endif
 
diff --git a/kernel/kmod.c b/kernel/kmod.c
index b750675251e5..7e95bedb2bfc 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -370,8 +370,10 @@ struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
         sub_info->argv = argv;
         sub_info->envp = envp;
         sub_info->cred = prepare_usermodehelper_creds();
-        if (!sub_info->cred)
+        if (!sub_info->cred) {
+                kfree(sub_info);
                 return NULL;
+        }
 
   out:
         return sub_info;
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 4ebaf8519abf..9b1a7de26979 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -9,11 +9,12 @@
 #include <linux/kthread.h>
 #include <linux/completion.h>
 #include <linux/err.h>
+#include <linux/cpuset.h>
 #include <linux/unistd.h>
 #include <linux/file.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
-#include <trace/sched.h>
+#include <trace/events/sched.h>
 
 #define KTHREAD_NICE_LEVEL (-5)
 
@@ -21,15 +22,11 @@ static DEFINE_SPINLOCK(kthread_create_lock);
 static LIST_HEAD(kthread_create_list);
 struct task_struct *kthreadd_task;
 
-DEFINE_TRACE(sched_kthread_stop);
-DEFINE_TRACE(sched_kthread_stop_ret);
-
 struct kthread_create_info
 {
         /* Information passed to kthread() from kthreadd. */
         int (*threadfn)(void *data);
         void *data;
-        struct completion started;
 
         /* Result passed back to kthread_create() from kthreadd. */
         struct task_struct *result;
@@ -38,17 +35,13 @@ struct kthread_create_info
         struct list_head list;
 };
 
-struct kthread_stop_info
-{
-        struct task_struct *k;
-        int err;
-        struct completion done;
+struct kthread {
+        int should_stop;
+        struct completion exited;
 };
 
-/* Thread stopping is done by setthing this var: lock serializes
- * multiple kthread_stop calls. */
-static DEFINE_MUTEX(kthread_stop_lock);
-static struct kthread_stop_info kthread_stop_info;
+#define to_kthread(tsk) \
+        container_of((tsk)->vfork_done, struct kthread, exited)
 
 /**
  * kthread_should_stop - should this kthread return now?
@@ -59,36 +52,35 @@ static struct kthread_stop_info kthread_stop_info;
  */
 int kthread_should_stop(void)
 {
-        return (kthread_stop_info.k == current);
+        return to_kthread(current)->should_stop;
 }
 EXPORT_SYMBOL(kthread_should_stop);
 
 static int kthread(void *_create)
 {
+        /* Copy data: it's on kthread's stack */
         struct kthread_create_info *create = _create;
-        int (*threadfn)(void *data);
-        void *data;
-        int ret = -EINTR;
+        int (*threadfn)(void *data) = create->threadfn;
+        void *data = create->data;
+        struct kthread self;
+        int ret;
 
-        /* Copy data: it's on kthread's stack */
-        threadfn = create->threadfn;
-        data = create->data;
+        self.should_stop = 0;
+        init_completion(&self.exited);
+        current->vfork_done = &self.exited;
 
         /* OK, tell user we're spawned, wait for stop or wakeup */
         __set_current_state(TASK_UNINTERRUPTIBLE);
         create->result = current;
-        complete(&create->started);
+        complete(&create->done);
         schedule();
 
-        if (!kthread_should_stop())
+        ret = -EINTR;
+        if (!self.should_stop)
                 ret = threadfn(data);
 
-        /* It might have exited on its own, w/o kthread_stop.  Check. */
-        if (kthread_should_stop()) {
-                kthread_stop_info.err = ret;
-                complete(&kthread_stop_info.done);
-        }
-        return 0;
+        /* we can't just return, we must preserve "self" on stack */
+        do_exit(ret);
 }
 
 static void create_kthread(struct kthread_create_info *create)
@@ -97,11 +89,10 @@ static void create_kthread(struct kthread_create_info *create)
 
         /* We want our own signal handler (we take no signals by default). */
         pid = kernel_thread(kthread, create, CLONE_FS | CLONE_FILES | SIGCHLD);
-        if (pid < 0)
+        if (pid < 0) {
                 create->result = ERR_PTR(pid);
-        else
-                wait_for_completion(&create->started);
-        complete(&create->done);
+                complete(&create->done);
+        }
 }
 
 /**
@@ -132,7 +123,6 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
 
         create.threadfn = threadfn;
         create.data = data;
-        init_completion(&create.started);
         init_completion(&create.done);
 
         spin_lock(&kthread_create_lock);
@@ -200,30 +190,22 @@ EXPORT_SYMBOL(kthread_bind);
  */
 int kthread_stop(struct task_struct *k)
 {
+        struct kthread *kthread;
         int ret;
 
-        mutex_lock(&kthread_stop_lock);
-
-        /* It could exit after stop_info.k set, but before wake_up_process. */
-        get_task_struct(k);
-
         trace_sched_kthread_stop(k);
+        get_task_struct(k);
 
-        /* Must init completion *before* thread sees kthread_stop_info.k */
-        init_completion(&kthread_stop_info.done);
-        smp_wmb();
+        kthread = to_kthread(k);
+        barrier(); /* it might have exited */
+        if (k->vfork_done != NULL) {
+                kthread->should_stop = 1;
+                wake_up_process(k);
+                wait_for_completion(&kthread->exited);
+        }
+        ret = k->exit_code;
 
-        /* Now set kthread_should_stop() to true, and wake it up. */
-        kthread_stop_info.k = k;
-        wake_up_process(k);
         put_task_struct(k);
-
-        /* Once it dies, reset stop ptr, gather result and we're done. */
-        wait_for_completion(&kthread_stop_info.done);
-        kthread_stop_info.k = NULL;
-        ret = kthread_stop_info.err;
-        mutex_unlock(&kthread_stop_lock);
-
         trace_sched_kthread_stop_ret(ret);
 
         return ret;
@@ -239,6 +221,7 @@ int kthreadd(void *unused)
         ignore_signals(tsk);
         set_user_nice(tsk, KTHREAD_NICE_LEVEL);
         set_cpus_allowed_ptr(tsk, cpu_all_mask);
+        set_mems_allowed(node_possible_map);
 
         current->flags |= PF_NOFREEZE | PF_FREEZER_NOSIG;
 
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index accb40cdb12a..8bbeef996c76 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -42,12 +42,14 @@
 #include <linux/hash.h>
 #include <linux/ftrace.h>
 #include <linux/stringify.h>
-#include <trace/lockdep.h>
 
 #include <asm/sections.h>
 
 #include "lockdep_internals.h"
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/lockdep.h>
+
 #ifdef CONFIG_PROVE_LOCKING
 int prove_locking = 1;
 module_param(prove_locking, int, 0644);
@@ -2935,8 +2937,6 @@ void lock_set_class(struct lockdep_map *lock, const char *name,
 }
 EXPORT_SYMBOL_GPL(lock_set_class);
 
-DEFINE_TRACE(lock_acquire);
-
 /*
  * We are not always called with irqs disabled - do that here,
  * and also avoid lockdep recursion:
@@ -2963,8 +2963,6 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
 }
 EXPORT_SYMBOL_GPL(lock_acquire);
 
-DEFINE_TRACE(lock_release);
-
 void lock_release(struct lockdep_map *lock, int nested,
                           unsigned long ip)
 {
@@ -3105,6 +3103,8 @@ found_it:
                 hlock->holdtime_stamp = now;
         }
 
+        trace_lock_acquired(lock, ip, waittime);
+
         stats = get_lock_stats(hlock_class(hlock));
         if (waittime) {
                 if (hlock->read)
@@ -3120,8 +3120,6 @@ found_it:
         lock->ip = ip;
 }
 
-DEFINE_TRACE(lock_contended);
-
 void lock_contended(struct lockdep_map *lock, unsigned long ip)
 {
         unsigned long flags;
@@ -3143,14 +3141,10 @@ void lock_contended(struct lockdep_map *lock, unsigned long ip)
 }
 EXPORT_SYMBOL_GPL(lock_contended);
 
-DEFINE_TRACE(lock_acquired);
-
 void lock_acquired(struct lockdep_map *lock, unsigned long ip)
 {
         unsigned long flags;
 
-        trace_lock_acquired(lock, ip);
-
         if (unlikely(!lock_stat))
                 return;
 
diff --git a/kernel/lockdep_internals.h b/kernel/lockdep_internals.h
index a2cc7e9a6e84..699a2ac3a0d7 100644
--- a/kernel/lockdep_internals.h
+++ b/kernel/lockdep_internals.h
@@ -54,9 +54,9 @@ enum {
  * table (if it's not there yet), and we check it for lock order
  * conflicts and deadlocks.
  */
-#define MAX_LOCKDEP_ENTRIES     8192UL
+#define MAX_LOCKDEP_ENTRIES     16384UL
 
-#define MAX_LOCKDEP_CHAINS_BITS 14
+#define MAX_LOCKDEP_CHAINS_BITS 15
 #define MAX_LOCKDEP_CHAINS      (1UL << MAX_LOCKDEP_CHAINS_BITS)
 
 #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
diff --git a/kernel/module.c b/kernel/module.c
index e797812a4d95..38928fcaff2b 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -18,6 +18,7 @@
 */
 #include <linux/module.h>
 #include <linux/moduleloader.h>
+#include <linux/ftrace_event.h>
 #include <linux/init.h>
 #include <linux/kallsyms.h>
 #include <linux/fs.h>
@@ -52,6 +53,7 @@
 #include <linux/ftrace.h>
 #include <linux/async.h>
 #include <linux/percpu.h>
+#include <linux/kmemleak.h>
 
 #if 0
 #define DEBUGP printk
@@ -72,6 +74,9 @@ DEFINE_MUTEX(module_mutex);
 EXPORT_SYMBOL_GPL(module_mutex);
 static LIST_HEAD(modules);
 
+/* Block module loading/unloading? */
+int modules_disabled = 0;
+
 /* Waiting for a module to finish initializing? */
 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
 
@@ -429,6 +434,7 @@ static void *percpu_modalloc(unsigned long size, unsigned long align,
         unsigned long extra;
         unsigned int i;
         void *ptr;
+        int cpu;
 
         if (align > PAGE_SIZE) {
                 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
@@ -458,6 +464,11 @@ static void *percpu_modalloc(unsigned long size, unsigned long align,
                         if (!split_block(i, size))
                                 return NULL;
 
+                /* add the per-cpu scanning areas */
+                for_each_possible_cpu(cpu)
+                        kmemleak_alloc(ptr + per_cpu_offset(cpu), size, 0,
+                                       GFP_KERNEL);
+
                 /* Mark allocated */
                 pcpu_size[i] = -pcpu_size[i];
                 return ptr;
@@ -472,6 +483,7 @@ static void percpu_modfree(void *freeme)
 {
         unsigned int i;
         void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
+        int cpu;
 
         /* First entry is core kernel percpu data. */
         for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
@@ -483,6 +495,10 @@ static void percpu_modfree(void *freeme)
         BUG();
 
  free:
+        /* remove the per-cpu scanning areas */
+        for_each_possible_cpu(cpu)
+                kmemleak_free(freeme + per_cpu_offset(cpu));
+
         /* Merge with previous? */
         if (pcpu_size[i-1] >= 0) {
                 pcpu_size[i-1] += pcpu_size[i];
@@ -777,7 +793,7 @@ SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
         char name[MODULE_NAME_LEN];
         int ret, forced = 0;
 
-        if (!capable(CAP_SYS_MODULE))
+        if (!capable(CAP_SYS_MODULE) || modules_disabled)
                 return -EPERM;
 
         if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
@@ -1489,9 +1505,6 @@ static void free_module(struct module *mod)
         /* Free any allocated parameters. */
         destroy_params(mod->kp, mod->num_kp);
 
-        /* release any pointers to mcount in this module */
-        ftrace_release(mod->module_core, mod->core_size);
-
         /* This may be NULL, but that's OK */
         module_free(mod, mod->module_init);
         kfree(mod->args);
@@ -1878,6 +1891,36 @@ static void *module_alloc_update_bounds(unsigned long size)
         return ret;
 }
 
+#ifdef CONFIG_DEBUG_KMEMLEAK
+static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
+                                 Elf_Shdr *sechdrs, char *secstrings)
+{
+        unsigned int i;
+
+        /* only scan the sections containing data */
+        kmemleak_scan_area(mod->module_core, (unsigned long)mod -
+                           (unsigned long)mod->module_core,
+                           sizeof(struct module), GFP_KERNEL);
+
+        for (i = 1; i < hdr->e_shnum; i++) {
+                if (!(sechdrs[i].sh_flags & SHF_ALLOC))
+                        continue;
+                if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
+                    && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
+                        continue;
+
+                kmemleak_scan_area(mod->module_core, sechdrs[i].sh_addr -
+                                   (unsigned long)mod->module_core,
+                                   sechdrs[i].sh_size, GFP_KERNEL);
+        }
+}
+#else
+static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
+                                        Elf_Shdr *sechdrs, char *secstrings)
+{
+}
+#endif
+
 /* Allocate and load the module: note that size of section 0 is always
    zero, and we rely on this for optional sections. */
 static noinline struct module *load_module(void __user *umod,
@@ -1892,11 +1935,9 @@ static noinline struct module *load_module(void __user *umod,
         unsigned int symindex = 0;
         unsigned int strindex = 0;
         unsigned int modindex, versindex, infoindex, pcpuindex;
-        unsigned int num_mcount;
         struct module *mod;
         long err = 0;
         void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
-        unsigned long *mseg;
         mm_segment_t old_fs;
 
         DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
@@ -2050,6 +2091,12 @@ static noinline struct module *load_module(void __user *umod,
 
         /* Do the allocs. */
         ptr = module_alloc_update_bounds(mod->core_size);
+        /*
+         * The pointer to this block is stored in the module structure
+         * which is inside the block. Just mark it as not being a
+         * leak.
+         */
+        kmemleak_not_leak(ptr);
         if (!ptr) {
                 err = -ENOMEM;
                 goto free_percpu;
@@ -2058,6 +2105,13 @@ static noinline struct module *load_module(void __user *umod,
         mod->module_core = ptr;
 
         ptr = module_alloc_update_bounds(mod->init_size);
+        /*
+         * The pointer to this block is stored in the module structure
+         * which is inside the block. This block doesn't need to be
+         * scanned as it contains data and code that will be freed
+         * after the module is initialized.
+         */
+        kmemleak_ignore(ptr);
         if (!ptr && mod->init_size) {
                 err = -ENOMEM;
                 goto free_core;
@@ -2088,6 +2142,7 @@ static noinline struct module *load_module(void __user *umod,
         }
         /* Module has been moved. */
         mod = (void *)sechdrs[modindex].sh_addr;
+        kmemleak_load_module(mod, hdr, sechdrs, secstrings);
 
 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
         mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t),
@@ -2161,6 +2216,10 @@ static noinline struct module *load_module(void __user *umod,
         mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
                                             "__kcrctab_unused_gpl");
 #endif
+#ifdef CONFIG_CONSTRUCTORS
+        mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
+                                  sizeof(*mod->ctors), &mod->num_ctors);
+#endif
 
 #ifdef CONFIG_MARKERS
         mod->markers = section_objs(hdr, sechdrs, secstrings, "__markers",
@@ -2172,7 +2231,19 @@ static noinline struct module *load_module(void __user *umod,
                                         sizeof(*mod->tracepoints),
                                         &mod->num_tracepoints);
 #endif
-
+#ifdef CONFIG_EVENT_TRACING
+        mod->trace_events = section_objs(hdr, sechdrs, secstrings,
+                                         "_ftrace_events",
+                                         sizeof(*mod->trace_events),
+                                         &mod->num_trace_events);
+#endif
+#ifdef CONFIG_FTRACE_MCOUNT_RECORD
+        /* sechdrs[0].sh_size is always zero */
+        mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
+                                             "__mcount_loc",
+                                             sizeof(*mod->ftrace_callsites),
+                                             &mod->num_ftrace_callsites);
+#endif
 #ifdef CONFIG_MODVERSIONS
         if ((mod->num_syms && !mod->crcs)
             || (mod->num_gpl_syms && !mod->gpl_crcs)
@@ -2237,11 +2308,6 @@ static noinline struct module *load_module(void __user *umod,
                         dynamic_debug_setup(debug, num_debug);
         }
 
-        /* sechdrs[0].sh_size is always zero */
-        mseg = section_objs(hdr, sechdrs, secstrings, "__mcount_loc",
-                            sizeof(*mseg), &num_mcount);
-        ftrace_init_module(mod, mseg, mseg + num_mcount);
-
         err = module_finalize(hdr, sechdrs, mod);
         if (err < 0)
                 goto cleanup;
@@ -2302,7 +2368,6 @@ static noinline struct module *load_module(void __user *umod,
  cleanup:
         kobject_del(&mod->mkobj.kobj);
         kobject_put(&mod->mkobj.kobj);
-        ftrace_release(mod->module_core, mod->core_size);
  free_unload:
         module_unload_free(mod);
 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
@@ -2328,6 +2393,17 @@ static noinline struct module *load_module(void __user *umod,
         goto free_hdr;
 }
 
+/* Call module constructors. */
+static void do_mod_ctors(struct module *mod)
+{
+#ifdef CONFIG_CONSTRUCTORS
+        unsigned long i;
+
+        for (i = 0; i < mod->num_ctors; i++)
+                mod->ctors[i]();
+#endif
+}
+
 /* This is where the real work happens */
 SYSCALL_DEFINE3(init_module, void __user *, umod,
                 unsigned long, len, const char __user *, uargs)
@@ -2336,7 +2412,7 @@ SYSCALL_DEFINE3(init_module, void __user *, umod,
         int ret = 0;
 
         /* Must have permission */
-        if (!capable(CAP_SYS_MODULE))
+        if (!capable(CAP_SYS_MODULE) || modules_disabled)
                 return -EPERM;
 
         /* Only one module load at a time, please */
@@ -2356,6 +2432,7 @@ SYSCALL_DEFINE3(init_module, void __user *, umod,
         blocking_notifier_call_chain(&module_notify_list,
                         MODULE_STATE_COMING, mod);
 
+        do_mod_ctors(mod);
         /* Start the module */
         if (mod->init != NULL)
                 ret = do_one_initcall(mod->init);
@@ -2394,6 +2471,7 @@ SYSCALL_DEFINE3(init_module, void __user *, umod,
         mutex_lock(&module_mutex);
         /* Drop initial reference. */
         module_put(mod);
+        trim_init_extable(mod);
         module_free(mod, mod->module_init);
         mod->module_init = NULL;
         mod->init_size = 0;
@@ -2837,7 +2915,7 @@ void print_modules(void)
         struct module *mod;
         char buf[8];
 
-        printk("Modules linked in:");
+        printk(KERN_DEFAULT "Modules linked in:");
         /* Most callers should already have preempt disabled, but make sure */
         preempt_disable();
         list_for_each_entry_rcu(mod, &modules, list)
diff --git a/kernel/mutex.c b/kernel/mutex.c
index 507cf2b5e9f1..947b3ad551f8 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -89,7 +89,7 @@ __mutex_lock_slowpath(atomic_t *lock_count);
  *
  * This function is similar to (but not equivalent to) down().
  */
-void inline __sched mutex_lock(struct mutex *lock)
+void __sched mutex_lock(struct mutex *lock)
 {
         might_sleep();
         /*
@@ -249,7 +249,9 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
 
                 /* didnt get the lock, go to sleep: */
                 spin_unlock_mutex(&lock->wait_lock, flags);
-                __schedule();
+                preempt_enable_no_resched();
+                schedule();
+                preempt_disable();
                 spin_lock_mutex(&lock->wait_lock, flags);
         }
 
@@ -471,5 +473,28 @@ int __sched mutex_trylock(struct mutex *lock)
 
         return ret;
 }
-
 EXPORT_SYMBOL(mutex_trylock);
+
+/**
+ * atomic_dec_and_mutex_lock - return holding mutex if we dec to 0
+ * @cnt: the atomic which we are to dec
+ * @lock: the mutex to return holding if we dec to 0
+ *
+ * return true and hold lock if we dec to 0, return false otherwise
+ */
+int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock)
+{
+        /* dec if we can't possibly hit 0 */
+        if (atomic_add_unless(cnt, -1, 1))
+                return 0;
+        /* we might hit 0, so take the lock */
+        mutex_lock(lock);
+        if (!atomic_dec_and_test(cnt)) {
+                /* when we actually did the dec, we didn't hit 0 */
+                mutex_unlock(lock);
+                return 0;
+        }
+        /* we hit 0, and we hold the lock */
+        return 1;
+}
+EXPORT_SYMBOL(atomic_dec_and_mutex_lock);
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index 63598dca2d0c..09b4ff9711b2 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -26,19 +26,14 @@ static struct kmem_cache *nsproxy_cachep;
 
 struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy);
 
-/*
- * creates a copy of "orig" with refcount 1.
- */
-static inline struct nsproxy *clone_nsproxy(struct nsproxy *orig)
+static inline struct nsproxy *create_nsproxy(void)
 {
-        struct nsproxy *ns;
+        struct nsproxy *nsproxy;
 
-        ns = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
-        if (ns) {
-                memcpy(ns, orig, sizeof(struct nsproxy));
-                atomic_set(&ns->count, 1);
-        }
-        return ns;
+        nsproxy = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
+        if (nsproxy)
+                atomic_set(&nsproxy->count, 1);
+        return nsproxy;
 }
 
 /*
@@ -52,7 +47,7 @@ static struct nsproxy *create_new_namespaces(unsigned long flags,
         struct nsproxy *new_nsp;
         int err;
 
-        new_nsp = clone_nsproxy(tsk->nsproxy);
+        new_nsp = create_nsproxy();
         if (!new_nsp)
                 return ERR_PTR(-ENOMEM);
 
diff --git a/kernel/panic.c b/kernel/panic.c
index 874ecf1307ae..984b3ecbd72c 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -340,39 +340,44 @@ void oops_exit(void)
 }
 
 #ifdef WANT_WARN_ON_SLOWPATH
-void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
-{
+struct slowpath_args {
+        const char *fmt;
         va_list args;
-        char function[KSYM_SYMBOL_LEN];
-        unsigned long caller = (unsigned long)__builtin_return_address(0);
-        const char *board;
+};
 
-        sprint_symbol(function, caller);
+static void warn_slowpath_common(const char *file, int line, void *caller, struct slowpath_args *args)
+{
+        const char *board;
 
         printk(KERN_WARNING "------------[ cut here ]------------\n");
-        printk(KERN_WARNING "WARNING: at %s:%d %s()\n", file,
-                line, function);
+        printk(KERN_WARNING "WARNING: at %s:%d %pS()\n", file, line, caller);
         board = dmi_get_system_info(DMI_PRODUCT_NAME);
         if (board)
                 printk(KERN_WARNING "Hardware name: %s\n", board);
 
-        if (*fmt) {
-                va_start(args, fmt);
-                vprintk(fmt, args);
-                va_end(args);
-        }
+        if (args)
+                vprintk(args->fmt, args->args);
 
         print_modules();
         dump_stack();
         print_oops_end_marker();
         add_taint(TAINT_WARN);
 }
+
+void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
+{
+        struct slowpath_args args;
+
+        args.fmt = fmt;
+        va_start(args.args, fmt);
+        warn_slowpath_common(file, line, __builtin_return_address(0), &args);
+        va_end(args.args);
+}
 EXPORT_SYMBOL(warn_slowpath_fmt);
 
 void warn_slowpath_null(const char *file, int line)
 {
-        static const char *empty = "";
-        warn_slowpath_fmt(file, line, empty);
+        warn_slowpath_common(file, line, __builtin_return_address(0), NULL);
 }
 EXPORT_SYMBOL(warn_slowpath_null);
 #endif
diff --git a/kernel/params.c b/kernel/params.c
index de273ec85bd2..7f6912ced2ba 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -24,9 +24,6 @@
 #include <linux/err.h>
 #include <linux/slab.h>
 
-/* We abuse the high bits of "perm" to record whether we kmalloc'ed. */
-#define KPARAM_KMALLOCED        0x80000000
-
 #if 0
 #define DEBUGP printk
 #else
@@ -220,13 +217,13 @@ int param_set_charp(const char *val, struct kernel_param *kp)
                 return -ENOSPC;
         }
 
-        if (kp->perm & KPARAM_KMALLOCED)
+        if (kp->flags & KPARAM_KMALLOCED)
                 kfree(*(char **)kp->arg);
 
         /* This is a hack.  We can't need to strdup in early boot, and we
          * don't need to; this mangled commandline is preserved. */
         if (slab_is_available()) {
-                kp->perm |= KPARAM_KMALLOCED;
+                kp->flags |= KPARAM_KMALLOCED;
                 *(char **)kp->arg = kstrdup(val, GFP_KERNEL);
                 if (!kp->arg)
                         return -ENOMEM;
@@ -241,44 +238,63 @@ int param_get_charp(char *buffer, struct kernel_param *kp)
         return sprintf(buffer, "%s", *((char **)kp->arg));
 }
 
+/* Actually could be a bool or an int, for historical reasons. */
 int param_set_bool(const char *val, struct kernel_param *kp)
 {
+        bool v;
+
         /* No equals means "set"... */
         if (!val) val = "1";
 
         /* One of =[yYnN01] */
         switch (val[0]) {
         case 'y': case 'Y': case '1':
-                *(int *)kp->arg = 1;
-                return 0;
+                v = true;
+                break;
         case 'n': case 'N': case '0':
-                *(int *)kp->arg = 0;
-                return 0;
+                v = false;
+                break;
+        default:
+                return -EINVAL;
         }
-        return -EINVAL;
+
+        if (kp->flags & KPARAM_ISBOOL)
+                *(bool *)kp->arg = v;
+        else
+                *(int *)kp->arg = v;
+        return 0;
 }
 
 int param_get_bool(char *buffer, struct kernel_param *kp)
 {
+        bool val;
+        if (kp->flags & KPARAM_ISBOOL)
+                val = *(bool *)kp->arg;
+        else
+                val = *(int *)kp->arg;
+
         /* Y and N chosen as being relatively non-coder friendly */
-        return sprintf(buffer, "%c", (*(int *)kp->arg) ? 'Y' : 'N');
+        return sprintf(buffer, "%c", val ? 'Y' : 'N');
 }
 
+/* This one must be bool. */
 int param_set_invbool(const char *val, struct kernel_param *kp)
 {
-        int boolval, ret;
+        int ret;
+        bool boolval;
         struct kernel_param dummy;
 
         dummy.arg = &boolval;
+        dummy.flags = KPARAM_ISBOOL;
         ret = param_set_bool(val, &dummy);
         if (ret == 0)
-                *(int *)kp->arg = !boolval;
+                *(bool *)kp->arg = !boolval;
         return ret;
 }
 
 int param_get_invbool(char *buffer, struct kernel_param *kp)
 {
-        return sprintf(buffer, "%c", (*(int *)kp->arg) ? 'N' : 'Y');
+        return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y');
 }
 
 /* We break the rule and mangle the string. */
@@ -591,7 +607,7 @@ void destroy_params(const struct kernel_param *params, unsigned num)
         unsigned int i;
 
         for (i = 0; i < num; i++)
-                if (params[i].perm & KPARAM_KMALLOCED)
+                if (params[i].flags & KPARAM_KMALLOCED)
                         kfree(*(char **)params[i].arg);
 }
 
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
new file mode 100644
index 000000000000..1a933a221ea4
--- /dev/null
+++ b/kernel/perf_counter.c
@@ -0,0 +1,4383 @@
+/*
+ * Performance counter core code
+ *
+ *  Copyright (C) 2008 Thomas Gleixner <tglx@linutronix.de>
+ *  Copyright (C) 2008-2009 Red Hat, Inc., Ingo Molnar
+ *  Copyright (C) 2008-2009 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
+ *  Copyright  ©  2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
+ *
+ *  For licensing details see kernel-base/COPYING
+ */
+
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/cpu.h>
+#include <linux/smp.h>
+#include <linux/file.h>
+#include <linux/poll.h>
+#include <linux/sysfs.h>
+#include <linux/dcache.h>
+#include <linux/percpu.h>
+#include <linux/ptrace.h>
+#include <linux/vmstat.h>
+#include <linux/hardirq.h>
+#include <linux/rculist.h>
+#include <linux/uaccess.h>
+#include <linux/syscalls.h>
+#include <linux/anon_inodes.h>
+#include <linux/kernel_stat.h>
+#include <linux/perf_counter.h>
+
+#include <asm/irq_regs.h>
+
+/*
+ * Each CPU has a list of per CPU counters:
+ */
+DEFINE_PER_CPU(struct perf_cpu_context, perf_cpu_context);
+
+int perf_max_counters __read_mostly = 1;
+static int perf_reserved_percpu __read_mostly;
+static int perf_overcommit __read_mostly = 1;
+
+static atomic_t nr_counters __read_mostly;
+static atomic_t nr_mmap_counters __read_mostly;
+static atomic_t nr_comm_counters __read_mostly;
+
+/*
+ * perf counter paranoia level:
+ *  0 - not paranoid
+ *  1 - disallow cpu counters to unpriv
+ *  2 - disallow kernel profiling to unpriv
+ */
+int sysctl_perf_counter_paranoid __read_mostly;
+
+static inline bool perf_paranoid_cpu(void)
+{
+        return sysctl_perf_counter_paranoid > 0;
+}
+
+static inline bool perf_paranoid_kernel(void)
+{
+        return sysctl_perf_counter_paranoid > 1;
+}
+
+int sysctl_perf_counter_mlock __read_mostly = 512; /* 'free' kb per user */
+
+/*
+ * max perf counter sample rate
+ */
+int sysctl_perf_counter_sample_rate __read_mostly = 100000;
+
+static atomic64_t perf_counter_id;
+
+/*
+ * Lock for (sysadmin-configurable) counter reservations:
+ */
+static DEFINE_SPINLOCK(perf_resource_lock);
+
+/*
+ * Architecture provided APIs - weak aliases:
+ */
+extern __weak const struct pmu *hw_perf_counter_init(struct perf_counter *counter)
+{
+        return NULL;
+}
+
+void __weak hw_perf_disable(void)               { barrier(); }
+void __weak hw_perf_enable(void)                { barrier(); }
+
+void __weak hw_perf_counter_setup(int cpu)      { barrier(); }
+
+int __weak
+hw_perf_group_sched_in(struct perf_counter *group_leader,
+               struct perf_cpu_context *cpuctx,
+               struct perf_counter_context *ctx, int cpu)
+{
+        return 0;
+}
+
+void __weak perf_counter_print_debug(void)      { }
+
+static DEFINE_PER_CPU(int, disable_count);
+
+void __perf_disable(void)
+{
+        __get_cpu_var(disable_count)++;
+}
+
+bool __perf_enable(void)
+{
+        return !--__get_cpu_var(disable_count);
+}
+
+void perf_disable(void)
+{
+        __perf_disable();
+        hw_perf_disable();
+}
+
+void perf_enable(void)
+{
+        if (__perf_enable())
+                hw_perf_enable();
+}
+
+static void get_ctx(struct perf_counter_context *ctx)
+{
+        WARN_ON(!atomic_inc_not_zero(&ctx->refcount));
+}
+
+static void free_ctx(struct rcu_head *head)
+{
+        struct perf_counter_context *ctx;
+
+        ctx = container_of(head, struct perf_counter_context, rcu_head);
+        kfree(ctx);
+}
+
+static void put_ctx(struct perf_counter_context *ctx)
+{
+        if (atomic_dec_and_test(&ctx->refcount)) {
+                if (ctx->parent_ctx)
+                        put_ctx(ctx->parent_ctx);
+                if (ctx->task)
+                        put_task_struct(ctx->task);
+                call_rcu(&ctx->rcu_head, free_ctx);
+        }
+}
+
+/*
+ * Get the perf_counter_context for a task and lock it.
+ * This has to cope with with the fact that until it is locked,
+ * the context could get moved to another task.
+ */
+static struct perf_counter_context *
+perf_lock_task_context(struct task_struct *task, unsigned long *flags)
+{
+        struct perf_counter_context *ctx;
+
+        rcu_read_lock();
+ retry:
+        ctx = rcu_dereference(task->perf_counter_ctxp);
+        if (ctx) {
+                /*
+                 * If this context is a clone of another, it might
+                 * get swapped for another underneath us by
+                 * perf_counter_task_sched_out, though the
+                 * rcu_read_lock() protects us from any context
+                 * getting freed.  Lock the context and check if it
+                 * got swapped before we could get the lock, and retry
+                 * if so.  If we locked the right context, then it
+                 * can't get swapped on us any more.
+                 */
+                spin_lock_irqsave(&ctx->lock, *flags);
+                if (ctx != rcu_dereference(task->perf_counter_ctxp)) {
+                        spin_unlock_irqrestore(&ctx->lock, *flags);
+                        goto retry;
+                }
+
+                if (!atomic_inc_not_zero(&ctx->refcount)) {
+                        spin_unlock_irqrestore(&ctx->lock, *flags);
+                        ctx = NULL;
+                }
+        }
+        rcu_read_unlock();
+        return ctx;
+}
+
+/*
+ * Get the context for a task and increment its pin_count so it
+ * can't get swapped to another task.  This also increments its
+ * reference count so that the context can't get freed.
+ */
+static struct perf_counter_context *perf_pin_task_context(struct task_struct *task)
+{
+        struct perf_counter_context *ctx;
+        unsigned long flags;
+
+        ctx = perf_lock_task_context(task, &flags);
+        if (ctx) {
+                ++ctx->pin_count;
+                spin_unlock_irqrestore(&ctx->lock, flags);
+        }
+        return ctx;
+}
+
+static void perf_unpin_context(struct perf_counter_context *ctx)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&ctx->lock, flags);
+        --ctx->pin_count;
+        spin_unlock_irqrestore(&ctx->lock, flags);
+        put_ctx(ctx);
+}
+
+/*
+ * Add a counter from the lists for its context.
+ * Must be called with ctx->mutex and ctx->lock held.
+ */
+static void
+list_add_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
+{
+        struct perf_counter *group_leader = counter->group_leader;
+
+        /*
+         * Depending on whether it is a standalone or sibling counter,
+         * add it straight to the context's counter list, or to the group
+         * leader's sibling list:
+         */
+        if (group_leader == counter)
+                list_add_tail(&counter->list_entry, &ctx->counter_list);
+        else {
+                list_add_tail(&counter->list_entry, &group_leader->sibling_list);
+                group_leader->nr_siblings++;
+        }
+
+        list_add_rcu(&counter->event_entry, &ctx->event_list);
+        ctx->nr_counters++;
+}
+
+/*
+ * Remove a counter from the lists for its context.
+ * Must be called with ctx->mutex and ctx->lock held.
+ */
+static void
+list_del_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
+{
+        struct perf_counter *sibling, *tmp;
+
+        if (list_empty(&counter->list_entry))
+                return;
+        ctx->nr_counters--;
+
+        list_del_init(&counter->list_entry);
+        list_del_rcu(&counter->event_entry);
+
+        if (counter->group_leader != counter)
+                counter->group_leader->nr_siblings--;
+
+        /*
+         * If this was a group counter with sibling counters then
+         * upgrade the siblings to singleton counters by adding them
+         * to the context list directly:
+         */
+        list_for_each_entry_safe(sibling, tmp,
+                                 &counter->sibling_list, list_entry) {
+
+                list_move_tail(&sibling->list_entry, &ctx->counter_list);
+                sibling->group_leader = sibling;
+        }
+}
+
+static void
+counter_sched_out(struct perf_counter *counter,
+                  struct perf_cpu_context *cpuctx,
+                  struct perf_counter_context *ctx)
+{
+        if (counter->state != PERF_COUNTER_STATE_ACTIVE)
+                return;
+
+        counter->state = PERF_COUNTER_STATE_INACTIVE;
+        counter->tstamp_stopped = ctx->time;
+        counter->pmu->disable(counter);
+        counter->oncpu = -1;
+
+        if (!is_software_counter(counter))
+                cpuctx->active_oncpu--;
+        ctx->nr_active--;
+        if (counter->attr.exclusive || !cpuctx->active_oncpu)
+                cpuctx->exclusive = 0;
+}
+
+static void
+group_sched_out(struct perf_counter *group_counter,
+                struct perf_cpu_context *cpuctx,
+                struct perf_counter_context *ctx)
+{
+        struct perf_counter *counter;
+
+        if (group_counter->state != PERF_COUNTER_STATE_ACTIVE)
+                return;
+
+        counter_sched_out(group_counter, cpuctx, ctx);
+
+        /*
+         * Schedule out siblings (if any):
+         */
+        list_for_each_entry(counter, &group_counter->sibling_list, list_entry)
+                counter_sched_out(counter, cpuctx, ctx);
+
+        if (group_counter->attr.exclusive)
+                cpuctx->exclusive = 0;
+}
+
+/*
+ * Cross CPU call to remove a performance counter
+ *
+ * We disable the counter on the hardware level first. After that we
+ * remove it from the context list.
+ */
+static void __perf_counter_remove_from_context(void *info)
+{
+        struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+        struct perf_counter *counter = info;
+        struct perf_counter_context *ctx = counter->ctx;
+
+        /*
+         * If this is a task context, we need to check whether it is
+         * the current task context of this cpu. If not it has been
+         * scheduled out before the smp call arrived.
+         */
+        if (ctx->task && cpuctx->task_ctx != ctx)
+                return;
+
+        spin_lock(&ctx->lock);
+        /*
+         * Protect the list operation against NMI by disabling the
+         * counters on a global level.
+         */
+        perf_disable();
+
+        counter_sched_out(counter, cpuctx, ctx);
+
+        list_del_counter(counter, ctx);
+
+        if (!ctx->task) {
+                /*
+                 * Allow more per task counters with respect to the
+                 * reservation:
+                 */
+                cpuctx->max_pertask =
+                        min(perf_max_counters - ctx->nr_counters,
+                            perf_max_counters - perf_reserved_percpu);
+        }
+
+        perf_enable();
+        spin_unlock(&ctx->lock);
+}
+
+
+/*
+ * Remove the counter from a task's (or a CPU's) list of counters.
+ *
+ * Must be called with ctx->mutex held.
+ *
+ * CPU counters are removed with a smp call. For task counters we only
+ * call when the task is on a CPU.
+ *
+ * If counter->ctx is a cloned context, callers must make sure that
+ * every task struct that counter->ctx->task could possibly point to
+ * remains valid.  This is OK when called from perf_release since
+ * that only calls us on the top-level context, which can't be a clone.
+ * When called from perf_counter_exit_task, it's OK because the
+ * context has been detached from its task.
+ */
+static void perf_counter_remove_from_context(struct perf_counter *counter)
+{
+        struct perf_counter_context *ctx = counter->ctx;
+        struct task_struct *task = ctx->task;
+
+        if (!task) {
+                /*
+                 * Per cpu counters are removed via an smp call and
+                 * the removal is always sucessful.
+                 */
+                smp_call_function_single(counter->cpu,
+                                         __perf_counter_remove_from_context,
+                                         counter, 1);
+                return;
+        }
+
+retry:
+        task_oncpu_function_call(task, __perf_counter_remove_from_context,
+                                 counter);
+
+        spin_lock_irq(&ctx->lock);
+        /*
+         * If the context is active we need to retry the smp call.
+         */
+        if (ctx->nr_active && !list_empty(&counter->list_entry)) {
+                spin_unlock_irq(&ctx->lock);
+                goto retry;
+        }
+
+        /*
+         * The lock prevents that this context is scheduled in so we
+         * can remove the counter safely, if the call above did not
+         * succeed.
+         */
+        if (!list_empty(&counter->list_entry)) {
+                list_del_counter(counter, ctx);
+        }
+        spin_unlock_irq(&ctx->lock);
+}
+
+static inline u64 perf_clock(void)
+{
+        return cpu_clock(smp_processor_id());
+}
+
+/*
+ * Update the record of the current time in a context.
+ */
+static void update_context_time(struct perf_counter_context *ctx)
+{
+        u64 now = perf_clock();
+
+        ctx->time += now - ctx->timestamp;
+        ctx->timestamp = now;
+}
+
+/*
+ * Update the total_time_enabled and total_time_running fields for a counter.
+ */
+static void update_counter_times(struct perf_counter *counter)
+{
+        struct perf_counter_context *ctx = counter->ctx;
+        u64 run_end;
+
+        if (counter->state < PERF_COUNTER_STATE_INACTIVE)
+                return;
+
+        counter->total_time_enabled = ctx->time - counter->tstamp_enabled;
+
+        if (counter->state == PERF_COUNTER_STATE_INACTIVE)
+                run_end = counter->tstamp_stopped;
+        else
+                run_end = ctx->time;
+
+        counter->total_time_running = run_end - counter->tstamp_running;
+}
+
+/*
+ * Update total_time_enabled and total_time_running for all counters in a group.
+ */
+static void update_group_times(struct perf_counter *leader)
+{
+        struct perf_counter *counter;
+
+        update_counter_times(leader);
+        list_for_each_entry(counter, &leader->sibling_list, list_entry)
+                update_counter_times(counter);
+}
+
+/*
+ * Cross CPU call to disable a performance counter
+ */
+static void __perf_counter_disable(void *info)
+{
+        struct perf_counter *counter = info;
+        struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+        struct perf_counter_context *ctx = counter->ctx;
+
+        /*
+         * If this is a per-task counter, need to check whether this
+         * counter's task is the current task on this cpu.
+         */
+        if (ctx->task && cpuctx->task_ctx != ctx)
+                return;
+
+        spin_lock(&ctx->lock);
+
+        /*
+         * If the counter is on, turn it off.
+         * If it is in error state, leave it in error state.
+         */
+        if (counter->state >= PERF_COUNTER_STATE_INACTIVE) {
+                update_context_time(ctx);
+                update_counter_times(counter);
+                if (counter == counter->group_leader)
+                        group_sched_out(counter, cpuctx, ctx);
+                else
+                        counter_sched_out(counter, cpuctx, ctx);
+                counter->state = PERF_COUNTER_STATE_OFF;
+        }
+
+        spin_unlock(&ctx->lock);
+}
+
+/*
+ * Disable a counter.
+ *
+ * If counter->ctx is a cloned context, callers must make sure that
+ * every task struct that counter->ctx->task could possibly point to
+ * remains valid.  This condition is satisifed when called through
+ * perf_counter_for_each_child or perf_counter_for_each because they
+ * hold the top-level counter's child_mutex, so any descendant that
+ * goes to exit will block in sync_child_counter.
+ * When called from perf_pending_counter it's OK because counter->ctx
+ * is the current context on this CPU and preemption is disabled,
+ * hence we can't get into perf_counter_task_sched_out for this context.
+ */
+static void perf_counter_disable(struct perf_counter *counter)
+{
+        struct perf_counter_context *ctx = counter->ctx;
+        struct task_struct *task = ctx->task;
+
+        if (!task) {
+                /*
+                 * Disable the counter on the cpu that it's on
+                 */
+                smp_call_function_single(counter->cpu, __perf_counter_disable,
+                                         counter, 1);
+                return;
+        }
+
+ retry:
+        task_oncpu_function_call(task, __perf_counter_disable, counter);
+
+        spin_lock_irq(&ctx->lock);
+        /*
+         * If the counter is still active, we need to retry the cross-call.
+         */
+        if (counter->state == PERF_COUNTER_STATE_ACTIVE) {
+                spin_unlock_irq(&ctx->lock);
+                goto retry;
+        }
+
+        /*
+         * Since we have the lock this context can't be scheduled
+         * in, so we can change the state safely.
+         */
+        if (counter->state == PERF_COUNTER_STATE_INACTIVE) {
+                update_counter_times(counter);
+                counter->state = PERF_COUNTER_STATE_OFF;
+        }
+
+        spin_unlock_irq(&ctx->lock);
+}
+
+static int
+counter_sched_in(struct perf_counter *counter,
+                 struct perf_cpu_context *cpuctx,
+                 struct perf_counter_context *ctx,
+                 int cpu)
+{
+        if (counter->state <= PERF_COUNTER_STATE_OFF)
+                return 0;
+
+        counter->state = PERF_COUNTER_STATE_ACTIVE;
+        counter->oncpu = cpu;   /* TODO: put 'cpu' into cpuctx->cpu */
+        /*
+         * The new state must be visible before we turn it on in the hardware:
+         */
+        smp_wmb();
+
+        if (counter->pmu->enable(counter)) {
+                counter->state = PERF_COUNTER_STATE_INACTIVE;
+                counter->oncpu = -1;
+                return -EAGAIN;
+        }
+
+        counter->tstamp_running += ctx->time - counter->tstamp_stopped;
+
+        if (!is_software_counter(counter))
+                cpuctx->active_oncpu++;
+        ctx->nr_active++;
+
+        if (counter->attr.exclusive)
+                cpuctx->exclusive = 1;
+
+        return 0;
+}
+
+static int
+group_sched_in(struct perf_counter *group_counter,
+               struct perf_cpu_context *cpuctx,
+               struct perf_counter_context *ctx,
+               int cpu)
+{
+        struct perf_counter *counter, *partial_group;
+        int ret;
+
+        if (group_counter->state == PERF_COUNTER_STATE_OFF)
+                return 0;
+
+        ret = hw_perf_group_sched_in(group_counter, cpuctx, ctx, cpu);
+        if (ret)
+                return ret < 0 ? ret : 0;
+
+        if (counter_sched_in(group_counter, cpuctx, ctx, cpu))
+                return -EAGAIN;
+
+        /*
+         * Schedule in siblings as one group (if any):
+         */
+        list_for_each_entry(counter, &group_counter->sibling_list, list_entry) {
+                if (counter_sched_in(counter, cpuctx, ctx, cpu)) {
+                        partial_group = counter;
+                        goto group_error;
+                }
+        }
+
+        return 0;
+
+group_error:
+        /*
+         * Groups can be scheduled in as one unit only, so undo any
+         * partial group before returning:
+         */
+        list_for_each_entry(counter, &group_counter->sibling_list, list_entry) {
+                if (counter == partial_group)
+                        break;
+                counter_sched_out(counter, cpuctx, ctx);
+        }
+        counter_sched_out(group_counter, cpuctx, ctx);
+
+        return -EAGAIN;
+}
+
+/*
+ * Return 1 for a group consisting entirely of software counters,
+ * 0 if the group contains any hardware counters.
+ */
+static int is_software_only_group(struct perf_counter *leader)
+{
+        struct perf_counter *counter;
+
+        if (!is_software_counter(leader))
+                return 0;
+
+        list_for_each_entry(counter, &leader->sibling_list, list_entry)
+                if (!is_software_counter(counter))
+                        return 0;
+
+        return 1;
+}
+
+/*
+ * Work out whether we can put this counter group on the CPU now.
+ */
+static int group_can_go_on(struct perf_counter *counter,
+                           struct perf_cpu_context *cpuctx,
+                           int can_add_hw)
+{
+        /*
+         * Groups consisting entirely of software counters can always go on.
+         */
+        if (is_software_only_group(counter))
+                return 1;
+        /*
+         * If an exclusive group is already on, no other hardware
+         * counters can go on.
+         */
+        if (cpuctx->exclusive)
+                return 0;
+        /*
+         * If this group is exclusive and there are already
+         * counters on the CPU, it can't go on.
+         */
+        if (counter->attr.exclusive && cpuctx->active_oncpu)
+                return 0;
+        /*
+         * Otherwise, try to add it if all previous groups were able
+         * to go on.
+         */
+        return can_add_hw;
+}
+
+static void add_counter_to_ctx(struct perf_counter *counter,
+                               struct perf_counter_context *ctx)
+{
+        list_add_counter(counter, ctx);
+        counter->tstamp_enabled = ctx->time;
+        counter->tstamp_running = ctx->time;
+        counter->tstamp_stopped = ctx->time;
+}
+
+/*
+ * Cross CPU call to install and enable a performance counter
+ *
+ * Must be called with ctx->mutex held
+ */
+static void __perf_install_in_context(void *info)
+{
+        struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+        struct perf_counter *counter = info;
+        struct perf_counter_context *ctx = counter->ctx;
+        struct perf_counter *leader = counter->group_leader;
+        int cpu = smp_processor_id();
+        int err;
+
+        /*
+         * If this is a task context, we need to check whether it is
+         * the current task context of this cpu. If not it has been
+         * scheduled out before the smp call arrived.
+         * Or possibly this is the right context but it isn't
+         * on this cpu because it had no counters.
+         */
+        if (ctx->task && cpuctx->task_ctx != ctx) {
+                if (cpuctx->task_ctx || ctx->task != current)
+                        return;
+                cpuctx->task_ctx = ctx;
+        }
+
+        spin_lock(&ctx->lock);
+        ctx->is_active = 1;
+        update_context_time(ctx);
+
+        /*
+         * Protect the list operation against NMI by disabling the
+         * counters on a global level. NOP for non NMI based counters.
+         */
+        perf_disable();
+
+        add_counter_to_ctx(counter, ctx);
+
+        /*
+         * Don't put the counter on if it is disabled or if
+         * it is in a group and the group isn't on.
+         */
+        if (counter->state != PERF_COUNTER_STATE_INACTIVE ||
+            (leader != counter && leader->state != PERF_COUNTER_STATE_ACTIVE))
+                goto unlock;
+
+        /*
+         * An exclusive counter can't go on if there are already active
+         * hardware counters, and no hardware counter can go on if there
+         * is already an exclusive counter on.
+         */
+        if (!group_can_go_on(counter, cpuctx, 1))
+                err = -EEXIST;
+        else
+                err = counter_sched_in(counter, cpuctx, ctx, cpu);
+
+        if (err) {
+                /*
+                 * This counter couldn't go on.  If it is in a group
+                 * then we have to pull the whole group off.
+                 * If the counter group is pinned then put it in error state.
+                 */
+                if (leader != counter)
+                        group_sched_out(leader, cpuctx, ctx);
+                if (leader->attr.pinned) {
+                        update_group_times(leader);
+                        leader->state = PERF_COUNTER_STATE_ERROR;
+                }
+        }
+
+        if (!err && !ctx->task && cpuctx->max_pertask)
+                cpuctx->max_pertask--;
+
+ unlock:
+        perf_enable();
+
+        spin_unlock(&ctx->lock);
+}
+
+/*
+ * Attach a performance counter to a context
+ *
+ * First we add the counter to the list with the hardware enable bit
+ * in counter->hw_config cleared.
+ *
+ * If the counter is attached to a task which is on a CPU we use a smp
+ * call to enable it in the task context. The task might have been
+ * scheduled away, but we check this in the smp call again.
+ *
+ * Must be called with ctx->mutex held.
+ */
+static void
+perf_install_in_context(struct perf_counter_context *ctx,
+                        struct perf_counter *counter,
+                        int cpu)
+{
+        struct task_struct *task = ctx->task;
+
+        if (!task) {
+                /*
+                 * Per cpu counters are installed via an smp call and
+                 * the install is always sucessful.
+                 */
+                smp_call_function_single(cpu, __perf_install_in_context,
+                                         counter, 1);
+                return;
+        }
+
+retry:
+        task_oncpu_function_call(task, __perf_install_in_context,
+                                 counter);
+
+        spin_lock_irq(&ctx->lock);
+        /*
+         * we need to retry the smp call.
+         */
+        if (ctx->is_active && list_empty(&counter->list_entry)) {
+                spin_unlock_irq(&ctx->lock);
+                goto retry;
+        }
+
+        /*
+         * The lock prevents that this context is scheduled in so we
+         * can add the counter safely, if it the call above did not
+         * succeed.
+         */
+        if (list_empty(&counter->list_entry))
+                add_counter_to_ctx(counter, ctx);
+        spin_unlock_irq(&ctx->lock);
+}
+
+/*
+ * Cross CPU call to enable a performance counter
+ */
+static void __perf_counter_enable(void *info)
+{
+        struct perf_counter *counter = info;
+        struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+        struct perf_counter_context *ctx = counter->ctx;
+        struct perf_counter *leader = counter->group_leader;
+        int err;
+
+        /*
+         * If this is a per-task counter, need to check whether this
+         * counter's task is the current task on this cpu.
+         */
+        if (ctx->task && cpuctx->task_ctx != ctx) {
+                if (cpuctx->task_ctx || ctx->task != current)
+                        return;
+                cpuctx->task_ctx = ctx;
+        }
+
+        spin_lock(&ctx->lock);
+        ctx->is_active = 1;
+        update_context_time(ctx);
+
+        if (counter->state >= PERF_COUNTER_STATE_INACTIVE)
+                goto unlock;
+        counter->state = PERF_COUNTER_STATE_INACTIVE;
+        counter->tstamp_enabled = ctx->time - counter->total_time_enabled;
+
+        /*
+         * If the counter is in a group and isn't the group leader,
+         * then don't put it on unless the group is on.
+         */
+        if (leader != counter && leader->state != PERF_COUNTER_STATE_ACTIVE)
+                goto unlock;
+
+        if (!group_can_go_on(counter, cpuctx, 1)) {
+                err = -EEXIST;
+        } else {
+                perf_disable();
+                if (counter == leader)
+                        err = group_sched_in(counter, cpuctx, ctx,
+                                             smp_processor_id());
+                else
+                        err = counter_sched_in(counter, cpuctx, ctx,
+                                               smp_processor_id());
+                perf_enable();
+        }
+
+        if (err) {
+                /*
+                 * If this counter can't go on and it's part of a
+                 * group, then the whole group has to come off.
+                 */
+                if (leader != counter)
+                        group_sched_out(leader, cpuctx, ctx);
+                if (leader->attr.pinned) {
+                        update_group_times(leader);
+                        leader->state = PERF_COUNTER_STATE_ERROR;
+                }
+        }
+
+ unlock:
+        spin_unlock(&ctx->lock);
+}
+
+/*
+ * Enable a counter.
+ *
+ * If counter->ctx is a cloned context, callers must make sure that
+ * every task struct that counter->ctx->task could possibly point to
+ * remains valid.  This condition is satisfied when called through
+ * perf_counter_for_each_child or perf_counter_for_each as described
+ * for perf_counter_disable.
+ */
+static void perf_counter_enable(struct perf_counter *counter)
+{
+        struct perf_counter_context *ctx = counter->ctx;
+        struct task_struct *task = ctx->task;
+
+        if (!task) {
+                /*
+                 * Enable the counter on the cpu that it's on
+                 */
+                smp_call_function_single(counter->cpu, __perf_counter_enable,
+                                         counter, 1);
+                return;
+        }
+
+        spin_lock_irq(&ctx->lock);
+        if (counter->state >= PERF_COUNTER_STATE_INACTIVE)
+                goto out;
+
+        /*
+         * If the counter is in error state, clear that first.
+         * That way, if we see the counter in error state below, we
+         * know that it has gone back into error state, as distinct
+         * from the task having been scheduled away before the
+         * cross-call arrived.
+         */
+        if (counter->state == PERF_COUNTER_STATE_ERROR)
+                counter->state = PERF_COUNTER_STATE_OFF;
+
+ retry:
+        spin_unlock_irq(&ctx->lock);
+        task_oncpu_function_call(task, __perf_counter_enable, counter);
+
+        spin_lock_irq(&ctx->lock);
+
+        /*
+         * If the context is active and the counter is still off,
+         * we need to retry the cross-call.
+         */
+        if (ctx->is_active && counter->state == PERF_COUNTER_STATE_OFF)
+                goto retry;
+
+        /*
+         * Since we have the lock this context can't be scheduled
+         * in, so we can change the state safely.
+         */
+        if (counter->state == PERF_COUNTER_STATE_OFF) {
+                counter->state = PERF_COUNTER_STATE_INACTIVE;
+                counter->tstamp_enabled =
+                        ctx->time - counter->total_time_enabled;
+        }
+ out:
+        spin_unlock_irq(&ctx->lock);
+}
+
+static int perf_counter_refresh(struct perf_counter *counter, int refresh)
+{
+        /*
+         * not supported on inherited counters
+         */
+        if (counter->attr.inherit)
+                return -EINVAL;
+
+        atomic_add(refresh, &counter->event_limit);
+        perf_counter_enable(counter);
+
+        return 0;
+}
+
+void __perf_counter_sched_out(struct perf_counter_context *ctx,
+                              struct perf_cpu_context *cpuctx)
+{
+        struct perf_counter *counter;
+
+        spin_lock(&ctx->lock);
+        ctx->is_active = 0;
+        if (likely(!ctx->nr_counters))
+                goto out;
+        update_context_time(ctx);
+
+        perf_disable();
+        if (ctx->nr_active) {
+                list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+                        if (counter != counter->group_leader)
+                                counter_sched_out(counter, cpuctx, ctx);
+                        else
+                                group_sched_out(counter, cpuctx, ctx);
+                }
+        }
+        perf_enable();
+ out:
+        spin_unlock(&ctx->lock);
+}
+
+/*
+ * Test whether two contexts are equivalent, i.e. whether they
+ * have both been cloned from the same version of the same context
+ * and they both have the same number of enabled counters.
+ * If the number of enabled counters is the same, then the set
+ * of enabled counters should be the same, because these are both
+ * inherited contexts, therefore we can't access individual counters
+ * in them directly with an fd; we can only enable/disable all
+ * counters via prctl, or enable/disable all counters in a family
+ * via ioctl, which will have the same effect on both contexts.
+ */
+static int context_equiv(struct perf_counter_context *ctx1,
+                         struct perf_counter_context *ctx2)
+{
+        return ctx1->parent_ctx && ctx1->parent_ctx == ctx2->parent_ctx
+                && ctx1->parent_gen == ctx2->parent_gen
+                && !ctx1->pin_count && !ctx2->pin_count;
+}
+
+/*
+ * Called from scheduler to remove the counters of the current task,
+ * with interrupts disabled.
+ *
+ * We stop each counter and update the counter value in counter->count.
+ *
+ * This does not protect us against NMI, but disable()
+ * sets the disabled bit in the control field of counter _before_
+ * accessing the counter control register. If a NMI hits, then it will
+ * not restart the counter.
+ */
+void perf_counter_task_sched_out(struct task_struct *task,
+                                 struct task_struct *next, int cpu)
+{
+        struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
+        struct perf_counter_context *ctx = task->perf_counter_ctxp;
+        struct perf_counter_context *next_ctx;
+        struct perf_counter_context *parent;
+        struct pt_regs *regs;
+        int do_switch = 1;
+
+        regs = task_pt_regs(task);
+        perf_swcounter_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 1, regs, 0);
+
+        if (likely(!ctx || !cpuctx->task_ctx))
+                return;
+
+        update_context_time(ctx);
+
+        rcu_read_lock();
+        parent = rcu_dereference(ctx->parent_ctx);
+        next_ctx = next->perf_counter_ctxp;
+        if (parent && next_ctx &&
+            rcu_dereference(next_ctx->parent_ctx) == parent) {
+                /*
+                 * Looks like the two contexts are clones, so we might be
+                 * able to optimize the context switch.  We lock both
+                 * contexts and check that they are clones under the
+                 * lock (including re-checking that neither has been
+                 * uncloned in the meantime).  It doesn't matter which
+                 * order we take the locks because no other cpu could
+                 * be trying to lock both of these tasks.
+                 */
+                spin_lock(&ctx->lock);
+                spin_lock_nested(&next_ctx->lock, SINGLE_DEPTH_NESTING);
+                if (context_equiv(ctx, next_ctx)) {
+                        /*
+                         * XXX do we need a memory barrier of sorts
+                         * wrt to rcu_dereference() of perf_counter_ctxp
+                         */
+                        task->perf_counter_ctxp = next_ctx;
+                        next->perf_counter_ctxp = ctx;
+                        ctx->task = next;
+                        next_ctx->task = task;
+                        do_switch = 0;
+                }
+                spin_unlock(&next_ctx->lock);
+                spin_unlock(&ctx->lock);
+        }
+        rcu_read_unlock();
+
+        if (do_switch) {
+                __perf_counter_sched_out(ctx, cpuctx);
+                cpuctx->task_ctx = NULL;
+        }
+}
+
+/*
+ * Called with IRQs disabled
+ */
+static void __perf_counter_task_sched_out(struct perf_counter_context *ctx)
+{
+        struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+
+        if (!cpuctx->task_ctx)
+                return;
+
+        if (WARN_ON_ONCE(ctx != cpuctx->task_ctx))
+                return;
+
+        __perf_counter_sched_out(ctx, cpuctx);
+        cpuctx->task_ctx = NULL;
+}
+
+/*
+ * Called with IRQs disabled
+ */
+static void perf_counter_cpu_sched_out(struct perf_cpu_context *cpuctx)
+{
+        __perf_counter_sched_out(&cpuctx->ctx, cpuctx);
+}
+
+static void
+__perf_counter_sched_in(struct perf_counter_context *ctx,
+                        struct perf_cpu_context *cpuctx, int cpu)
+{
+        struct perf_counter *counter;
+        int can_add_hw = 1;
+
+        spin_lock(&ctx->lock);
+        ctx->is_active = 1;
+        if (likely(!ctx->nr_counters))
+                goto out;
+
+        ctx->timestamp = perf_clock();
+
+        perf_disable();
+
+        /*
+         * First go through the list and put on any pinned groups
+         * in order to give them the best chance of going on.
+         */
+        list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+                if (counter->state <= PERF_COUNTER_STATE_OFF ||
+                    !counter->attr.pinned)
+                        continue;
+                if (counter->cpu != -1 && counter->cpu != cpu)
+                        continue;
+
+                if (counter != counter->group_leader)
+                        counter_sched_in(counter, cpuctx, ctx, cpu);
+                else {
+                        if (group_can_go_on(counter, cpuctx, 1))
+                                group_sched_in(counter, cpuctx, ctx, cpu);
+                }
+
+                /*
+                 * If this pinned group hasn't been scheduled,
+                 * put it in error state.
+                 */
+                if (counter->state == PERF_COUNTER_STATE_INACTIVE) {
+                        update_group_times(counter);
+                        counter->state = PERF_COUNTER_STATE_ERROR;
+                }
+        }
+
+        list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+                /*
+                 * Ignore counters in OFF or ERROR state, and
+                 * ignore pinned counters since we did them already.
+                 */
+                if (counter->state <= PERF_COUNTER_STATE_OFF ||
+                    counter->attr.pinned)
+                        continue;
+
+                /*
+                 * Listen to the 'cpu' scheduling filter constraint
+                 * of counters:
+                 */
+                if (counter->cpu != -1 && counter->cpu != cpu)
+                        continue;
+
+                if (counter != counter->group_leader) {
+                        if (counter_sched_in(counter, cpuctx, ctx, cpu))
+                                can_add_hw = 0;
+                } else {
+                        if (group_can_go_on(counter, cpuctx, can_add_hw)) {
+                                if (group_sched_in(counter, cpuctx, ctx, cpu))
+                                        can_add_hw = 0;
+                        }
+                }
+        }
+        perf_enable();
+ out:
+        spin_unlock(&ctx->lock);
+}
+
+/*
+ * Called from scheduler to add the counters of the current task
+ * with interrupts disabled.
+ *
+ * We restore the counter value and then enable it.
+ *
+ * This does not protect us against NMI, but enable()
+ * sets the enabled bit in the control field of counter _before_
+ * accessing the counter control register. If a NMI hits, then it will
+ * keep the counter running.
+ */
+void perf_counter_task_sched_in(struct task_struct *task, int cpu)
+{
+        struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
+        struct perf_counter_context *ctx = task->perf_counter_ctxp;
+
+        if (likely(!ctx))
+                return;
+        if (cpuctx->task_ctx == ctx)
+                return;
+        __perf_counter_sched_in(ctx, cpuctx, cpu);
+        cpuctx->task_ctx = ctx;
+}
+
+static void perf_counter_cpu_sched_in(struct perf_cpu_context *cpuctx, int cpu)
+{
+        struct perf_counter_context *ctx = &cpuctx->ctx;
+
+        __perf_counter_sched_in(ctx, cpuctx, cpu);
+}
+
+#define MAX_INTERRUPTS (~0ULL)
+
+static void perf_log_throttle(struct perf_counter *counter, int enable);
+static void perf_log_period(struct perf_counter *counter, u64 period);
+
+static void perf_adjust_period(struct perf_counter *counter, u64 events)
+{
+        struct hw_perf_counter *hwc = &counter->hw;
+        u64 period, sample_period;
+        s64 delta;
+
+        events *= hwc->sample_period;
+        period = div64_u64(events, counter->attr.sample_freq);
+
+        delta = (s64)(period - hwc->sample_period);
+        delta = (delta + 7) / 8; /* low pass filter */
+
+        sample_period = hwc->sample_period + delta;
+
+        if (!sample_period)
+                sample_period = 1;
+
+        perf_log_period(counter, sample_period);
+
+        hwc->sample_period = sample_period;
+}
+
+static void perf_ctx_adjust_freq(struct perf_counter_context *ctx)
+{
+        struct perf_counter *counter;
+        struct hw_perf_counter *hwc;
+        u64 interrupts, freq;
+
+        spin_lock(&ctx->lock);
+        list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+                if (counter->state != PERF_COUNTER_STATE_ACTIVE)
+                        continue;
+
+                hwc = &counter->hw;
+
+                interrupts = hwc->interrupts;
+                hwc->interrupts = 0;
+
+                /*
+                 * unthrottle counters on the tick
+                 */
+                if (interrupts == MAX_INTERRUPTS) {
+                        perf_log_throttle(counter, 1);
+                        counter->pmu->unthrottle(counter);
+                        interrupts = 2*sysctl_perf_counter_sample_rate/HZ;
+                }
+
+                if (!counter->attr.freq || !counter->attr.sample_freq)
+                        continue;
+
+                /*
+                 * if the specified freq < HZ then we need to skip ticks
+                 */
+                if (counter->attr.sample_freq < HZ) {
+                        freq = counter->attr.sample_freq;
+
+                        hwc->freq_count += freq;
+                        hwc->freq_interrupts += interrupts;
+
+                        if (hwc->freq_count < HZ)
+                                continue;
+
+                        interrupts = hwc->freq_interrupts;
+                        hwc->freq_interrupts = 0;
+                        hwc->freq_count -= HZ;
+                } else
+                        freq = HZ;
+
+                perf_adjust_period(counter, freq * interrupts);
+
+                /*
+                 * In order to avoid being stalled by an (accidental) huge
+                 * sample period, force reset the sample period if we didn't
+                 * get any events in this freq period.
+                 */
+                if (!interrupts) {
+                        perf_disable();
+                        counter->pmu->disable(counter);
+                        atomic64_set(&hwc->period_left, 0);
+                        counter->pmu->enable(counter);
+                        perf_enable();
+                }
+        }
+        spin_unlock(&ctx->lock);
+}
+
+/*
+ * Round-robin a context's counters:
+ */
+static void rotate_ctx(struct perf_counter_context *ctx)
+{
+        struct perf_counter *counter;
+
+        if (!ctx->nr_counters)
+                return;
+
+        spin_lock(&ctx->lock);
+        /*
+         * Rotate the first entry last (works just fine for group counters too):
+         */
+        perf_disable();
+        list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+                list_move_tail(&counter->list_entry, &ctx->counter_list);
+                break;
+        }
+        perf_enable();
+
+        spin_unlock(&ctx->lock);
+}
+
+void perf_counter_task_tick(struct task_struct *curr, int cpu)
+{
+        struct perf_cpu_context *cpuctx;
+        struct perf_counter_context *ctx;
+
+        if (!atomic_read(&nr_counters))
+                return;
+
+        cpuctx = &per_cpu(perf_cpu_context, cpu);
+        ctx = curr->perf_counter_ctxp;
+
+        perf_ctx_adjust_freq(&cpuctx->ctx);
+        if (ctx)
+                perf_ctx_adjust_freq(ctx);
+
+        perf_counter_cpu_sched_out(cpuctx);
+        if (ctx)
+                __perf_counter_task_sched_out(ctx);
+
+        rotate_ctx(&cpuctx->ctx);
+        if (ctx)
+                rotate_ctx(ctx);
+
+        perf_counter_cpu_sched_in(cpuctx, cpu);
+        if (ctx)
+                perf_counter_task_sched_in(curr, cpu);
+}
+
+/*
+ * Cross CPU call to read the hardware counter
+ */
+static void __read(void *info)
+{
+        struct perf_counter *counter = info;
+        struct perf_counter_context *ctx = counter->ctx;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        if (ctx->is_active)
+                update_context_time(ctx);
+        counter->pmu->read(counter);
+        update_counter_times(counter);
+        local_irq_restore(flags);
+}
+
+static u64 perf_counter_read(struct perf_counter *counter)
+{
+        /*
+         * If counter is enabled and currently active on a CPU, update the
+         * value in the counter structure:
+         */
+        if (counter->state == PERF_COUNTER_STATE_ACTIVE) {
+                smp_call_function_single(counter->oncpu,
+                                         __read, counter, 1);
+        } else if (counter->state == PERF_COUNTER_STATE_INACTIVE) {
+                update_counter_times(counter);
+        }
+
+        return atomic64_read(&counter->count);
+}
+
+/*
+ * Initialize the perf_counter context in a task_struct:
+ */
+static void
+__perf_counter_init_context(struct perf_counter_context *ctx,
+                            struct task_struct *task)
+{
+        memset(ctx, 0, sizeof(*ctx));
+        spin_lock_init(&ctx->lock);
+        mutex_init(&ctx->mutex);
+        INIT_LIST_HEAD(&ctx->counter_list);
+        INIT_LIST_HEAD(&ctx->event_list);
+        atomic_set(&ctx->refcount, 1);
+        ctx->task = task;
+}
+
+static struct perf_counter_context *find_get_context(pid_t pid, int cpu)
+{
+        struct perf_counter_context *parent_ctx;
+        struct perf_counter_context *ctx;
+        struct perf_cpu_context *cpuctx;
+        struct task_struct *task;
+        unsigned long flags;
+        int err;
+
+        /*
+         * If cpu is not a wildcard then this is a percpu counter:
+         */
+        if (cpu != -1) {
+                /* Must be root to operate on a CPU counter: */
+                if (perf_paranoid_cpu() && !capable(CAP_SYS_ADMIN))
+                        return ERR_PTR(-EACCES);
+
+                if (cpu < 0 || cpu > num_possible_cpus())
+                        return ERR_PTR(-EINVAL);
+
+                /*
+                 * We could be clever and allow to attach a counter to an
+                 * offline CPU and activate it when the CPU comes up, but
+                 * that's for later.
+                 */
+                if (!cpu_isset(cpu, cpu_online_map))
+                        return ERR_PTR(-ENODEV);
+
+                cpuctx = &per_cpu(perf_cpu_context, cpu);
+                ctx = &cpuctx->ctx;
+                get_ctx(ctx);
+
+                return ctx;
+        }
+
+        rcu_read_lock();
+        if (!pid)
+                task = current;
+        else
+                task = find_task_by_vpid(pid);
+        if (task)
+                get_task_struct(task);
+        rcu_read_unlock();
+
+        if (!task)
+                return ERR_PTR(-ESRCH);
+
+        /*
+         * Can't attach counters to a dying task.
+         */
+        err = -ESRCH;
+        if (task->flags & PF_EXITING)
+                goto errout;
+
+        /* Reuse ptrace permission checks for now. */
+        err = -EACCES;
+        if (!ptrace_may_access(task, PTRACE_MODE_READ))
+                goto errout;
+
+ retry:
+        ctx = perf_lock_task_context(task, &flags);
+        if (ctx) {
+                parent_ctx = ctx->parent_ctx;
+                if (parent_ctx) {
+                        put_ctx(parent_ctx);
+                        ctx->parent_ctx = NULL;         /* no longer a clone */
+                }
+                spin_unlock_irqrestore(&ctx->lock, flags);
+        }
+
+        if (!ctx) {
+                ctx = kmalloc(sizeof(struct perf_counter_context), GFP_KERNEL);
+                err = -ENOMEM;
+                if (!ctx)
+                        goto errout;
+                __perf_counter_init_context(ctx, task);
+                get_ctx(ctx);
+                if (cmpxchg(&task->perf_counter_ctxp, NULL, ctx)) {
+                        /*
+                         * We raced with some other task; use
+                         * the context they set.
+                         */
+                        kfree(ctx);
+                        goto retry;
+                }
+                get_task_struct(task);
+        }
+
+        put_task_struct(task);
+        return ctx;
+
+ errout:
+        put_task_struct(task);
+        return ERR_PTR(err);
+}
+
+static void free_counter_rcu(struct rcu_head *head)
+{
+        struct perf_counter *counter;
+
+        counter = container_of(head, struct perf_counter, rcu_head);
+        if (counter->ns)
+                put_pid_ns(counter->ns);
+        kfree(counter);
+}
+
+static void perf_pending_sync(struct perf_counter *counter);
+
+static void free_counter(struct perf_counter *counter)
+{
+        perf_pending_sync(counter);
+
+        atomic_dec(&nr_counters);
+        if (counter->attr.mmap)
+                atomic_dec(&nr_mmap_counters);
+        if (counter->attr.comm)
+                atomic_dec(&nr_comm_counters);
+
+        if (counter->destroy)
+                counter->destroy(counter);
+
+        put_ctx(counter->ctx);
+        call_rcu(&counter->rcu_head, free_counter_rcu);
+}
+
+/*
+ * Called when the last reference to the file is gone.
+ */
+static int perf_release(struct inode *inode, struct file *file)
+{
+        struct perf_counter *counter = file->private_data;
+        struct perf_counter_context *ctx = counter->ctx;
+
+        file->private_data = NULL;
+
+        WARN_ON_ONCE(ctx->parent_ctx);
+        mutex_lock(&ctx->mutex);
+        perf_counter_remove_from_context(counter);
+        mutex_unlock(&ctx->mutex);
+
+        mutex_lock(&counter->owner->perf_counter_mutex);
+        list_del_init(&counter->owner_entry);
+        mutex_unlock(&counter->owner->perf_counter_mutex);
+        put_task_struct(counter->owner);
+
+        free_counter(counter);
+
+        return 0;
+}
+
+/*
+ * Read the performance counter - simple non blocking version for now
+ */
+static ssize_t
+perf_read_hw(struct perf_counter *counter, char __user *buf, size_t count)
+{
+        u64 values[4];
+        int n;
+
+        /*
+         * Return end-of-file for a read on a counter that is in
+         * error state (i.e. because it was pinned but it couldn't be
+         * scheduled on to the CPU at some point).
+         */
+        if (counter->state == PERF_COUNTER_STATE_ERROR)
+                return 0;
+
+        WARN_ON_ONCE(counter->ctx->parent_ctx);
+        mutex_lock(&counter->child_mutex);
+        values[0] = perf_counter_read(counter);
+        n = 1;
+        if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+                values[n++] = counter->total_time_enabled +
+                        atomic64_read(&counter->child_total_time_enabled);
+        if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+                values[n++] = counter->total_time_running +
+                        atomic64_read(&counter->child_total_time_running);
+        if (counter->attr.read_format & PERF_FORMAT_ID)
+                values[n++] = counter->id;
+        mutex_unlock(&counter->child_mutex);
+
+        if (count < n * sizeof(u64))
+                return -EINVAL;
+        count = n * sizeof(u64);
+
+        if (copy_to_user(buf, values, count))
+                return -EFAULT;
+
+        return count;
+}
+
+static ssize_t
+perf_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+{
+        struct perf_counter *counter = file->private_data;
+
+        return perf_read_hw(counter, buf, count);
+}
+
+static unsigned int perf_poll(struct file *file, poll_table *wait)
+{
+        struct perf_counter *counter = file->private_data;
+        struct perf_mmap_data *data;
+        unsigned int events = POLL_HUP;
+
+        rcu_read_lock();
+        data = rcu_dereference(counter->data);
+        if (data)
+                events = atomic_xchg(&data->poll, 0);
+        rcu_read_unlock();
+
+        poll_wait(file, &counter->waitq, wait);
+
+        return events;
+}
+
+static void perf_counter_reset(struct perf_counter *counter)
+{
+        (void)perf_counter_read(counter);
+        atomic64_set(&counter->count, 0);
+        perf_counter_update_userpage(counter);
+}
+
+/*
+ * Holding the top-level counter's child_mutex means that any
+ * descendant process that has inherited this counter will block
+ * in sync_child_counter if it goes to exit, thus satisfying the
+ * task existence requirements of perf_counter_enable/disable.
+ */
+static void perf_counter_for_each_child(struct perf_counter *counter,
+                                        void (*func)(struct perf_counter *))
+{
+        struct perf_counter *child;
+
+        WARN_ON_ONCE(counter->ctx->parent_ctx);
+        mutex_lock(&counter->child_mutex);
+        func(counter);
+        list_for_each_entry(child, &counter->child_list, child_list)
+                func(child);
+        mutex_unlock(&counter->child_mutex);
+}
+
+static void perf_counter_for_each(struct perf_counter *counter,
+                                  void (*func)(struct perf_counter *))
+{
+        struct perf_counter_context *ctx = counter->ctx;
+        struct perf_counter *sibling;
+
+        WARN_ON_ONCE(ctx->parent_ctx);
+        mutex_lock(&ctx->mutex);
+        counter = counter->group_leader;
+
+        perf_counter_for_each_child(counter, func);
+        func(counter);
+        list_for_each_entry(sibling, &counter->sibling_list, list_entry)
+                perf_counter_for_each_child(counter, func);
+        mutex_unlock(&ctx->mutex);
+}
+
+static int perf_counter_period(struct perf_counter *counter, u64 __user *arg)
+{
+        struct perf_counter_context *ctx = counter->ctx;
+        unsigned long size;
+        int ret = 0;
+        u64 value;
+
+        if (!counter->attr.sample_period)
+                return -EINVAL;
+
+        size = copy_from_user(&value, arg, sizeof(value));
+        if (size != sizeof(value))
+                return -EFAULT;
+
+        if (!value)
+                return -EINVAL;
+
+        spin_lock_irq(&ctx->lock);
+        if (counter->attr.freq) {
+                if (value > sysctl_perf_counter_sample_rate) {
+                        ret = -EINVAL;
+                        goto unlock;
+                }
+
+                counter->attr.sample_freq = value;
+        } else {
+                perf_log_period(counter, value);
+
+                counter->attr.sample_period = value;
+                counter->hw.sample_period = value;
+        }
+unlock:
+        spin_unlock_irq(&ctx->lock);
+
+        return ret;
+}
+
+static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+        struct perf_counter *counter = file->private_data;
+        void (*func)(struct perf_counter *);
+        u32 flags = arg;
+
+        switch (cmd) {
+        case PERF_COUNTER_IOC_ENABLE:
+                func = perf_counter_enable;
+                break;
+        case PERF_COUNTER_IOC_DISABLE:
+                func = perf_counter_disable;
+                break;
+        case PERF_COUNTER_IOC_RESET:
+                func = perf_counter_reset;
+                break;
+
+        case PERF_COUNTER_IOC_REFRESH:
+                return perf_counter_refresh(counter, arg);
+
+        case PERF_COUNTER_IOC_PERIOD:
+                return perf_counter_period(counter, (u64 __user *)arg);
+
+        default:
+                return -ENOTTY;
+        }
+
+        if (flags & PERF_IOC_FLAG_GROUP)
+                perf_counter_for_each(counter, func);
+        else
+                perf_counter_for_each_child(counter, func);
+
+        return 0;
+}
+
+int perf_counter_task_enable(void)
+{
+        struct perf_counter *counter;
+
+        mutex_lock(&current->perf_counter_mutex);
+        list_for_each_entry(counter, &current->perf_counter_list, owner_entry)
+                perf_counter_for_each_child(counter, perf_counter_enable);
+        mutex_unlock(&current->perf_counter_mutex);
+
+        return 0;
+}
+
+int perf_counter_task_disable(void)
+{
+        struct perf_counter *counter;
+
+        mutex_lock(&current->perf_counter_mutex);
+        list_for_each_entry(counter, &current->perf_counter_list, owner_entry)
+                perf_counter_for_each_child(counter, perf_counter_disable);
+        mutex_unlock(&current->perf_counter_mutex);
+
+        return 0;
+}
+
+/*
+ * Callers need to ensure there can be no nesting of this function, otherwise
+ * the seqlock logic goes bad. We can not serialize this because the arch
+ * code calls this from NMI context.
+ */
+void perf_counter_update_userpage(struct perf_counter *counter)
+{
+        struct perf_counter_mmap_page *userpg;
+        struct perf_mmap_data *data;
+
+        rcu_read_lock();
+        data = rcu_dereference(counter->data);
+        if (!data)
+                goto unlock;
+
+        userpg = data->user_page;
+
+        /*
+         * Disable preemption so as to not let the corresponding user-space
+         * spin too long if we get preempted.
+         */
+        preempt_disable();
+        ++userpg->lock;
+        barrier();
+        userpg->index = counter->hw.idx;
+        userpg->offset = atomic64_read(&counter->count);
+        if (counter->state == PERF_COUNTER_STATE_ACTIVE)
+                userpg->offset -= atomic64_read(&counter->hw.prev_count);
+
+        barrier();
+        ++userpg->lock;
+        preempt_enable();
+unlock:
+        rcu_read_unlock();
+}
+
+static int perf_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+        struct perf_counter *counter = vma->vm_file->private_data;
+        struct perf_mmap_data *data;
+        int ret = VM_FAULT_SIGBUS;
+
+        if (vmf->flags & FAULT_FLAG_MKWRITE) {
+                if (vmf->pgoff == 0)
+                        ret = 0;
+                return ret;
+        }
+
+        rcu_read_lock();
+        data = rcu_dereference(counter->data);
+        if (!data)
+                goto unlock;
+
+        if (vmf->pgoff == 0) {
+                vmf->page = virt_to_page(data->user_page);
+        } else {
+                int nr = vmf->pgoff - 1;
+
+                if ((unsigned)nr > data->nr_pages)
+                        goto unlock;
+
+                if (vmf->flags & FAULT_FLAG_WRITE)
+                        goto unlock;
+
+                vmf->page = virt_to_page(data->data_pages[nr]);
+        }
+
+        get_page(vmf->page);
+        vmf->page->mapping = vma->vm_file->f_mapping;
+        vmf->page->index   = vmf->pgoff;
+
+        ret = 0;
+unlock:
+        rcu_read_unlock();
+
+        return ret;
+}
+
+static int perf_mmap_data_alloc(struct perf_counter *counter, int nr_pages)
+{
+        struct perf_mmap_data *data;
+        unsigned long size;
+        int i;
+
+        WARN_ON(atomic_read(&counter->mmap_count));
+
+        size = sizeof(struct perf_mmap_data);
+        size += nr_pages * sizeof(void *);
+
+        data = kzalloc(size, GFP_KERNEL);
+        if (!data)
+                goto fail;
+
+        data->user_page = (void *)get_zeroed_page(GFP_KERNEL);
+        if (!data->user_page)
+                goto fail_user_page;
+
+        for (i = 0; i < nr_pages; i++) {
+                data->data_pages[i] = (void *)get_zeroed_page(GFP_KERNEL);
+                if (!data->data_pages[i])
+                        goto fail_data_pages;
+        }
+
+        data->nr_pages = nr_pages;
+        atomic_set(&data->lock, -1);
+
+        rcu_assign_pointer(counter->data, data);
+
+        return 0;
+
+fail_data_pages:
+        for (i--; i >= 0; i--)
+                free_page((unsigned long)data->data_pages[i]);
+
+        free_page((unsigned long)data->user_page);
+
+fail_user_page:
+        kfree(data);
+
+fail:
+        return -ENOMEM;
+}
+
+static void perf_mmap_free_page(unsigned long addr)
+{
+        struct page *page = virt_to_page(addr);
+
+        page->mapping = NULL;
+        __free_page(page);
+}
+
+static void __perf_mmap_data_free(struct rcu_head *rcu_head)
+{
+        struct perf_mmap_data *data;
+        int i;
+
+        data = container_of(rcu_head, struct perf_mmap_data, rcu_head);
+
+        perf_mmap_free_page((unsigned long)data->user_page);
+        for (i = 0; i < data->nr_pages; i++)
+                perf_mmap_free_page((unsigned long)data->data_pages[i]);
+
+        kfree(data);
+}
+
+static void perf_mmap_data_free(struct perf_counter *counter)
+{
+        struct perf_mmap_data *data = counter->data;
+
+        WARN_ON(atomic_read(&counter->mmap_count));
+
+        rcu_assign_pointer(counter->data, NULL);
+        call_rcu(&data->rcu_head, __perf_mmap_data_free);
+}
+
+static void perf_mmap_open(struct vm_area_struct *vma)
+{
+        struct perf_counter *counter = vma->vm_file->private_data;
+
+        atomic_inc(&counter->mmap_count);
+}
+
+static void perf_mmap_close(struct vm_area_struct *vma)
+{
+        struct perf_counter *counter = vma->vm_file->private_data;
+
+        WARN_ON_ONCE(counter->ctx->parent_ctx);
+        if (atomic_dec_and_mutex_lock(&counter->mmap_count, &counter->mmap_mutex)) {
+                struct user_struct *user = current_user();
+
+                atomic_long_sub(counter->data->nr_pages + 1, &user->locked_vm);
+                vma->vm_mm->locked_vm -= counter->data->nr_locked;
+                perf_mmap_data_free(counter);
+                mutex_unlock(&counter->mmap_mutex);
+        }
+}
+
+static struct vm_operations_struct perf_mmap_vmops = {
+        .open           = perf_mmap_open,
+        .close          = perf_mmap_close,
+        .fault          = perf_mmap_fault,
+        .page_mkwrite   = perf_mmap_fault,
+};
+
+static int perf_mmap(struct file *file, struct vm_area_struct *vma)
+{
+        struct perf_counter *counter = file->private_data;
+        unsigned long user_locked, user_lock_limit;
+        struct user_struct *user = current_user();
+        unsigned long locked, lock_limit;
+        unsigned long vma_size;
+        unsigned long nr_pages;
+        long user_extra, extra;
+        int ret = 0;
+
+        if (!(vma->vm_flags & VM_SHARED))
+                return -EINVAL;
+
+        vma_size = vma->vm_end - vma->vm_start;
+        nr_pages = (vma_size / PAGE_SIZE) - 1;
+
+        /*
+         * If we have data pages ensure they're a power-of-two number, so we
+         * can do bitmasks instead of modulo.
+         */
+        if (nr_pages != 0 && !is_power_of_2(nr_pages))
+                return -EINVAL;
+
+        if (vma_size != PAGE_SIZE * (1 + nr_pages))
+                return -EINVAL;
+
+        if (vma->vm_pgoff != 0)
+                return -EINVAL;
+
+        WARN_ON_ONCE(counter->ctx->parent_ctx);
+        mutex_lock(&counter->mmap_mutex);
+        if (atomic_inc_not_zero(&counter->mmap_count)) {
+                if (nr_pages != counter->data->nr_pages)
+                        ret = -EINVAL;
+                goto unlock;
+        }
+
+        user_extra = nr_pages + 1;
+        user_lock_limit = sysctl_perf_counter_mlock >> (PAGE_SHIFT - 10);
+
+        /*
+         * Increase the limit linearly with more CPUs:
+         */
+        user_lock_limit *= num_online_cpus();
+
+        user_locked = atomic_long_read(&user->locked_vm) + user_extra;
+
+        extra = 0;
+        if (user_locked > user_lock_limit)
+                extra = user_locked - user_lock_limit;
+
+        lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur;
+        lock_limit >>= PAGE_SHIFT;
+        locked = vma->vm_mm->locked_vm + extra;
+
+        if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {
+                ret = -EPERM;
+                goto unlock;
+        }
+
+        WARN_ON(counter->data);
+        ret = perf_mmap_data_alloc(counter, nr_pages);
+        if (ret)
+                goto unlock;
+
+        atomic_set(&counter->mmap_count, 1);
+        atomic_long_add(user_extra, &user->locked_vm);
+        vma->vm_mm->locked_vm += extra;
+        counter->data->nr_locked = extra;
+        if (vma->vm_flags & VM_WRITE)
+                counter->data->writable = 1;
+
+unlock:
+        mutex_unlock(&counter->mmap_mutex);
+
+        vma->vm_flags |= VM_RESERVED;
+        vma->vm_ops = &perf_mmap_vmops;
+
+        return ret;
+}
+
+static int perf_fasync(int fd, struct file *filp, int on)
+{
+        struct inode *inode = filp->f_path.dentry->d_inode;
+        struct perf_counter *counter = filp->private_data;
+        int retval;
+
+        mutex_lock(&inode->i_mutex);
+        retval = fasync_helper(fd, filp, on, &counter->fasync);
+        mutex_unlock(&inode->i_mutex);
+
+        if (retval < 0)
+                return retval;
+
+        return 0;
+}
+
+static const struct file_operations perf_fops = {
+        .release                = perf_release,
+        .read                   = perf_read,
+        .poll                   = perf_poll,
+        .unlocked_ioctl         = perf_ioctl,
+        .compat_ioctl           = perf_ioctl,
+        .mmap                   = perf_mmap,
+        .fasync                 = perf_fasync,
+};
+
+/*
+ * Perf counter wakeup
+ *
+ * If there's data, ensure we set the poll() state and publish everything
+ * to user-space before waking everybody up.
+ */
+
+void perf_counter_wakeup(struct perf_counter *counter)
+{
+        wake_up_all(&counter->waitq);
+
+        if (counter->pending_kill) {
+                kill_fasync(&counter->fasync, SIGIO, counter->pending_kill);
+                counter->pending_kill = 0;
+        }
+}
+
+/*
+ * Pending wakeups
+ *
+ * Handle the case where we need to wakeup up from NMI (or rq->lock) context.
+ *
+ * The NMI bit means we cannot possibly take locks. Therefore, maintain a
+ * single linked list and use cmpxchg() to add entries lockless.
+ */
+
+static void perf_pending_counter(struct perf_pending_entry *entry)
+{
+        struct perf_counter *counter = container_of(entry,
+                        struct perf_counter, pending);
+
+        if (counter->pending_disable) {
+                counter->pending_disable = 0;
+                perf_counter_disable(counter);
+        }
+
+        if (counter->pending_wakeup) {
+                counter->pending_wakeup = 0;
+                perf_counter_wakeup(counter);
+        }
+}
+
+#define PENDING_TAIL ((struct perf_pending_entry *)-1UL)
+
+static DEFINE_PER_CPU(struct perf_pending_entry *, perf_pending_head) = {
+        PENDING_TAIL,
+};
+
+static void perf_pending_queue(struct perf_pending_entry *entry,
+                               void (*func)(struct perf_pending_entry *))
+{
+        struct perf_pending_entry **head;
+
+        if (cmpxchg(&entry->next, NULL, PENDING_TAIL) != NULL)
+                return;
+
+        entry->func = func;
+
+        head = &get_cpu_var(perf_pending_head);
+
+        do {
+                entry->next = *head;
+        } while (cmpxchg(head, entry->next, entry) != entry->next);
+
+        set_perf_counter_pending();
+
+        put_cpu_var(perf_pending_head);
+}
+
+static int __perf_pending_run(void)
+{
+        struct perf_pending_entry *list;
+        int nr = 0;
+
+        list = xchg(&__get_cpu_var(perf_pending_head), PENDING_TAIL);
+        while (list != PENDING_TAIL) {
+                void (*func)(struct perf_pending_entry *);
+                struct perf_pending_entry *entry = list;
+
+                list = list->next;
+
+                func = entry->func;
+                entry->next = NULL;
+                /*
+                 * Ensure we observe the unqueue before we issue the wakeup,
+                 * so that we won't be waiting forever.
+                 * -- see perf_not_pending().
+                 */
+                smp_wmb();
+
+                func(entry);
+                nr++;
+        }
+
+        return nr;
+}
+
+static inline int perf_not_pending(struct perf_counter *counter)
+{
+        /*
+         * If we flush on whatever cpu we run, there is a chance we don't
+         * need to wait.
+         */
+        get_cpu();
+        __perf_pending_run();
+        put_cpu();
+
+        /*
+         * Ensure we see the proper queue state before going to sleep
+         * so that we do not miss the wakeup. -- see perf_pending_handle()
+         */
+        smp_rmb();
+        return counter->pending.next == NULL;
+}
+
+static void perf_pending_sync(struct perf_counter *counter)
+{
+        wait_event(counter->waitq, perf_not_pending(counter));
+}
+
+void perf_counter_do_pending(void)
+{
+        __perf_pending_run();
+}
+
+/*
+ * Callchain support -- arch specific
+ */
+
+__weak struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
+{
+        return NULL;
+}
+
+/*
+ * Output
+ */
+
+struct perf_output_handle {
+        struct perf_counter     *counter;
+        struct perf_mmap_data   *data;
+        unsigned long           head;
+        unsigned long           offset;
+        int                     nmi;
+        int                     sample;
+        int                     locked;
+        unsigned long           flags;
+};
+
+static bool perf_output_space(struct perf_mmap_data *data,
+                              unsigned int offset, unsigned int head)
+{
+        unsigned long tail;
+        unsigned long mask;
+
+        if (!data->writable)
+                return true;
+
+        mask = (data->nr_pages << PAGE_SHIFT) - 1;
+        /*
+         * Userspace could choose to issue a mb() before updating the tail
+         * pointer. So that all reads will be completed before the write is
+         * issued.
+         */
+        tail = ACCESS_ONCE(data->user_page->data_tail);
+        smp_rmb();
+
+        offset = (offset - tail) & mask;
+        head   = (head   - tail) & mask;
+
+        if ((int)(head - offset) < 0)
+                return false;
+
+        return true;
+}
+
+static void perf_output_wakeup(struct perf_output_handle *handle)
+{
+        atomic_set(&handle->data->poll, POLL_IN);
+
+        if (handle->nmi) {
+                handle->counter->pending_wakeup = 1;
+                perf_pending_queue(&handle->counter->pending,
+                                   perf_pending_counter);
+        } else
+                perf_counter_wakeup(handle->counter);
+}
+
+/*
+ * Curious locking construct.
+ *
+ * We need to ensure a later event doesn't publish a head when a former
+ * event isn't done writing. However since we need to deal with NMIs we
+ * cannot fully serialize things.
+ *
+ * What we do is serialize between CPUs so we only have to deal with NMI
+ * nesting on a single CPU.
+ *
+ * We only publish the head (and generate a wakeup) when the outer-most
+ * event completes.
+ */
+static void perf_output_lock(struct perf_output_handle *handle)
+{
+        struct perf_mmap_data *data = handle->data;
+        int cpu;
+
+        handle->locked = 0;
+
+        local_irq_save(handle->flags);
+        cpu = smp_processor_id();
+
+        if (in_nmi() && atomic_read(&data->lock) == cpu)
+                return;
+
+        while (atomic_cmpxchg(&data->lock, -1, cpu) != -1)
+                cpu_relax();
+
+        handle->locked = 1;
+}
+
+static void perf_output_unlock(struct perf_output_handle *handle)
+{
+        struct perf_mmap_data *data = handle->data;
+        unsigned long head;
+        int cpu;
+
+        data->done_head = data->head;
+
+        if (!handle->locked)
+                goto out;
+
+again:
+        /*
+         * The xchg implies a full barrier that ensures all writes are done
+         * before we publish the new head, matched by a rmb() in userspace when
+         * reading this position.
+         */
+        while ((head = atomic_long_xchg(&data->done_head, 0)))
+                data->user_page->data_head = head;
+
+        /*
+         * NMI can happen here, which means we can miss a done_head update.
+         */
+
+        cpu = atomic_xchg(&data->lock, -1);
+        WARN_ON_ONCE(cpu != smp_processor_id());
+
+        /*
+         * Therefore we have to validate we did not indeed do so.
+         */
+        if (unlikely(atomic_long_read(&data->done_head))) {
+                /*
+                 * Since we had it locked, we can lock it again.
+                 */
+                while (atomic_cmpxchg(&data->lock, -1, cpu) != -1)
+                        cpu_relax();
+
+                goto again;
+        }
+
+        if (atomic_xchg(&data->wakeup, 0))
+                perf_output_wakeup(handle);
+out:
+        local_irq_restore(handle->flags);
+}
+
+static void perf_output_copy(struct perf_output_handle *handle,
+                             const void *buf, unsigned int len)
+{
+        unsigned int pages_mask;
+        unsigned int offset;
+        unsigned int size;
+        void **pages;
+
+        offset          = handle->offset;
+        pages_mask      = handle->data->nr_pages - 1;
+        pages           = handle->data->data_pages;
+
+        do {
+                unsigned int page_offset;
+                int nr;
+
+                nr          = (offset >> PAGE_SHIFT) & pages_mask;
+                page_offset = offset & (PAGE_SIZE - 1);
+                size        = min_t(unsigned int, PAGE_SIZE - page_offset, len);
+
+                memcpy(pages[nr] + page_offset, buf, size);
+
+                len         -= size;
+                buf         += size;
+                offset      += size;
+        } while (len);
+
+        handle->offset = offset;
+
+        /*
+         * Check we didn't copy past our reservation window, taking the
+         * possible unsigned int wrap into account.
+         */
+        WARN_ON_ONCE(((long)(handle->head - handle->offset)) < 0);
+}
+
+#define perf_output_put(handle, x) \
+        perf_output_copy((handle), &(x), sizeof(x))
+
+static int perf_output_begin(struct perf_output_handle *handle,
+                             struct perf_counter *counter, unsigned int size,
+                             int nmi, int sample)
+{
+        struct perf_mmap_data *data;
+        unsigned int offset, head;
+        int have_lost;
+        struct {
+                struct perf_event_header header;
+                u64                      id;
+                u64                      lost;
+        } lost_event;
+
+        /*
+         * For inherited counters we send all the output towards the parent.
+         */
+        if (counter->parent)
+                counter = counter->parent;
+
+        rcu_read_lock();
+        data = rcu_dereference(counter->data);
+        if (!data)
+                goto out;
+
+        handle->data    = data;
+        handle->counter = counter;
+        handle->nmi     = nmi;
+        handle->sample  = sample;
+
+        if (!data->nr_pages)
+                goto fail;
+
+        have_lost = atomic_read(&data->lost);
+        if (have_lost)
+                size += sizeof(lost_event);
+
+        perf_output_lock(handle);
+
+        do {
+                offset = head = atomic_long_read(&data->head);
+                head += size;
+                if (unlikely(!perf_output_space(data, offset, head)))
+                        goto fail;
+        } while (atomic_long_cmpxchg(&data->head, offset, head) != offset);
+
+        handle->offset  = offset;
+        handle->head    = head;
+
+        if ((offset >> PAGE_SHIFT) != (head >> PAGE_SHIFT))
+                atomic_set(&data->wakeup, 1);
+
+        if (have_lost) {
+                lost_event.header.type = PERF_EVENT_LOST;
+                lost_event.header.misc = 0;
+                lost_event.header.size = sizeof(lost_event);
+                lost_event.id          = counter->id;
+                lost_event.lost        = atomic_xchg(&data->lost, 0);
+
+                perf_output_put(handle, lost_event);
+        }
+
+        return 0;
+
+fail:
+        atomic_inc(&data->lost);
+        perf_output_unlock(handle);
+out:
+        rcu_read_unlock();
+
+        return -ENOSPC;
+}
+
+static void perf_output_end(struct perf_output_handle *handle)
+{
+        struct perf_counter *counter = handle->counter;
+        struct perf_mmap_data *data = handle->data;
+
+        int wakeup_events = counter->attr.wakeup_events;
+
+        if (handle->sample && wakeup_events) {
+                int events = atomic_inc_return(&data->events);
+                if (events >= wakeup_events) {
+                        atomic_sub(wakeup_events, &data->events);
+                        atomic_set(&data->wakeup, 1);
+                }
+        }
+
+        perf_output_unlock(handle);
+        rcu_read_unlock();
+}
+
+static u32 perf_counter_pid(struct perf_counter *counter, struct task_struct *p)
+{
+        /*
+         * only top level counters have the pid namespace they were created in
+         */
+        if (counter->parent)
+                counter = counter->parent;
+
+        return task_tgid_nr_ns(p, counter->ns);
+}
+
+static u32 perf_counter_tid(struct perf_counter *counter, struct task_struct *p)
+{
+        /*
+         * only top level counters have the pid namespace they were created in
+         */
+        if (counter->parent)
+                counter = counter->parent;
+
+        return task_pid_nr_ns(p, counter->ns);
+}
+
+static void perf_counter_output(struct perf_counter *counter, int nmi,
+                                struct perf_sample_data *data)
+{
+        int ret;
+        u64 sample_type = counter->attr.sample_type;
+        struct perf_output_handle handle;
+        struct perf_event_header header;
+        u64 ip;
+        struct {
+                u32 pid, tid;
+        } tid_entry;
+        struct {
+                u64 id;
+                u64 counter;
+        } group_entry;
+        struct perf_callchain_entry *callchain = NULL;
+        int callchain_size = 0;
+        u64 time;
+        struct {
+                u32 cpu, reserved;
+        } cpu_entry;
+
+        header.type = 0;
+        header.size = sizeof(header);
+
+        header.misc = PERF_EVENT_MISC_OVERFLOW;
+        header.misc |= perf_misc_flags(data->regs);
+
+        if (sample_type & PERF_SAMPLE_IP) {
+                ip = perf_instruction_pointer(data->regs);
+                header.type |= PERF_SAMPLE_IP;
+                header.size += sizeof(ip);
+        }
+
+        if (sample_type & PERF_SAMPLE_TID) {
+                /* namespace issues */
+                tid_entry.pid = perf_counter_pid(counter, current);
+                tid_entry.tid = perf_counter_tid(counter, current);
+
+                header.type |= PERF_SAMPLE_TID;
+                header.size += sizeof(tid_entry);
+        }
+
+        if (sample_type & PERF_SAMPLE_TIME) {
+                /*
+                 * Maybe do better on x86 and provide cpu_clock_nmi()
+                 */
+                time = sched_clock();
+
+                header.type |= PERF_SAMPLE_TIME;
+                header.size += sizeof(u64);
+        }
+
+        if (sample_type & PERF_SAMPLE_ADDR) {
+                header.type |= PERF_SAMPLE_ADDR;
+                header.size += sizeof(u64);
+        }
+
+        if (sample_type & PERF_SAMPLE_ID) {
+                header.type |= PERF_SAMPLE_ID;
+                header.size += sizeof(u64);
+        }
+
+        if (sample_type & PERF_SAMPLE_CPU) {
+                header.type |= PERF_SAMPLE_CPU;
+                header.size += sizeof(cpu_entry);
+
+                cpu_entry.cpu = raw_smp_processor_id();
+        }
+
+        if (sample_type & PERF_SAMPLE_PERIOD) {
+                header.type |= PERF_SAMPLE_PERIOD;
+                header.size += sizeof(u64);
+        }
+
+        if (sample_type & PERF_SAMPLE_GROUP) {
+                header.type |= PERF_SAMPLE_GROUP;
+                header.size += sizeof(u64) +
+                        counter->nr_siblings * sizeof(group_entry);
+        }
+
+        if (sample_type & PERF_SAMPLE_CALLCHAIN) {
+                callchain = perf_callchain(data->regs);
+
+                if (callchain) {
+                        callchain_size = (1 + callchain->nr) * sizeof(u64);
+
+                        header.type |= PERF_SAMPLE_CALLCHAIN;
+                        header.size += callchain_size;
+                }
+        }
+
+        ret = perf_output_begin(&handle, counter, header.size, nmi, 1);
+        if (ret)
+                return;
+
+        perf_output_put(&handle, header);
+
+        if (sample_type & PERF_SAMPLE_IP)
+                perf_output_put(&handle, ip);
+
+        if (sample_type & PERF_SAMPLE_TID)
+                perf_output_put(&handle, tid_entry);
+
+        if (sample_type & PERF_SAMPLE_TIME)
+                perf_output_put(&handle, time);
+
+        if (sample_type & PERF_SAMPLE_ADDR)
+                perf_output_put(&handle, data->addr);
+
+        if (sample_type & PERF_SAMPLE_ID)
+                perf_output_put(&handle, counter->id);
+
+        if (sample_type & PERF_SAMPLE_CPU)
+                perf_output_put(&handle, cpu_entry);
+
+        if (sample_type & PERF_SAMPLE_PERIOD)
+                perf_output_put(&handle, data->period);
+
+        /*
+         * XXX PERF_SAMPLE_GROUP vs inherited counters seems difficult.
+         */
+        if (sample_type & PERF_SAMPLE_GROUP) {
+                struct perf_counter *leader, *sub;
+                u64 nr = counter->nr_siblings;
+
+                perf_output_put(&handle, nr);
+
+                leader = counter->group_leader;
+                list_for_each_entry(sub, &leader->sibling_list, list_entry) {
+                        if (sub != counter)
+                                sub->pmu->read(sub);
+
+                        group_entry.id = sub->id;
+                        group_entry.counter = atomic64_read(&sub->count);
+
+                        perf_output_put(&handle, group_entry);
+                }
+        }
+
+        if (callchain)
+                perf_output_copy(&handle, callchain, callchain_size);
+
+        perf_output_end(&handle);
+}
+
+/*
+ * fork tracking
+ */
+
+struct perf_fork_event {
+        struct task_struct      *task;
+
+        struct {
+                struct perf_event_header        header;
+
+                u32                             pid;
+                u32                             ppid;
+        } event;
+};
+
+static void perf_counter_fork_output(struct perf_counter *counter,
+                                     struct perf_fork_event *fork_event)
+{
+        struct perf_output_handle handle;
+        int size = fork_event->event.header.size;
+        struct task_struct *task = fork_event->task;
+        int ret = perf_output_begin(&handle, counter, size, 0, 0);
+
+        if (ret)
+                return;
+
+        fork_event->event.pid = perf_counter_pid(counter, task);
+        fork_event->event.ppid = perf_counter_pid(counter, task->real_parent);
+
+        perf_output_put(&handle, fork_event->event);
+        perf_output_end(&handle);
+}
+
+static int perf_counter_fork_match(struct perf_counter *counter)
+{
+        if (counter->attr.comm || counter->attr.mmap)
+                return 1;
+
+        return 0;
+}
+
+static void perf_counter_fork_ctx(struct perf_counter_context *ctx,
+                                  struct perf_fork_event *fork_event)
+{
+        struct perf_counter *counter;
+
+        if (system_state != SYSTEM_RUNNING || list_empty(&ctx->event_list))
+                return;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(counter, &ctx->event_list, event_entry) {
+                if (perf_counter_fork_match(counter))
+                        perf_counter_fork_output(counter, fork_event);
+        }
+        rcu_read_unlock();
+}
+
+static void perf_counter_fork_event(struct perf_fork_event *fork_event)
+{
+        struct perf_cpu_context *cpuctx;
+        struct perf_counter_context *ctx;
+
+        cpuctx = &get_cpu_var(perf_cpu_context);
+        perf_counter_fork_ctx(&cpuctx->ctx, fork_event);
+        put_cpu_var(perf_cpu_context);
+
+        rcu_read_lock();
+        /*
+         * doesn't really matter which of the child contexts the
+         * events ends up in.
+         */
+        ctx = rcu_dereference(current->perf_counter_ctxp);
+        if (ctx)
+                perf_counter_fork_ctx(ctx, fork_event);
+        rcu_read_unlock();
+}
+
+void perf_counter_fork(struct task_struct *task)
+{
+        struct perf_fork_event fork_event;
+
+        if (!atomic_read(&nr_comm_counters) &&
+            !atomic_read(&nr_mmap_counters))
+                return;
+
+        fork_event = (struct perf_fork_event){
+                .task   = task,
+                .event  = {
+                        .header = {
+                                .type = PERF_EVENT_FORK,
+                                .size = sizeof(fork_event.event),
+                        },
+                },
+        };
+
+        perf_counter_fork_event(&fork_event);
+}
+
+/*
+ * comm tracking
+ */
+
+struct perf_comm_event {
+        struct task_struct      *task;
+        char                    *comm;
+        int                     comm_size;
+
+        struct {
+                struct perf_event_header        header;
+
+                u32                             pid;
+                u32                             tid;
+        } event;
+};
+
+static void perf_counter_comm_output(struct perf_counter *counter,
+                                     struct perf_comm_event *comm_event)
+{
+        struct perf_output_handle handle;
+        int size = comm_event->event.header.size;
+        int ret = perf_output_begin(&handle, counter, size, 0, 0);
+
+        if (ret)
+                return;
+
+        comm_event->event.pid = perf_counter_pid(counter, comm_event->task);
+        comm_event->event.tid = perf_counter_tid(counter, comm_event->task);
+
+        perf_output_put(&handle, comm_event->event);
+        perf_output_copy(&handle, comm_event->comm,
+                                   comm_event->comm_size);
+        perf_output_end(&handle);
+}
+
+static int perf_counter_comm_match(struct perf_counter *counter)
+{
+        if (counter->attr.comm)
+                return 1;
+
+        return 0;
+}
+
+static void perf_counter_comm_ctx(struct perf_counter_context *ctx,
+                                  struct perf_comm_event *comm_event)
+{
+        struct perf_counter *counter;
+
+        if (system_state != SYSTEM_RUNNING || list_empty(&ctx->event_list))
+                return;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(counter, &ctx->event_list, event_entry) {
+                if (perf_counter_comm_match(counter))
+                        perf_counter_comm_output(counter, comm_event);
+        }
+        rcu_read_unlock();
+}
+
+static void perf_counter_comm_event(struct perf_comm_event *comm_event)
+{
+        struct perf_cpu_context *cpuctx;
+        struct perf_counter_context *ctx;
+        unsigned int size;
+        char *comm = comm_event->task->comm;
+
+        size = ALIGN(strlen(comm)+1, sizeof(u64));
+
+        comm_event->comm = comm;
+        comm_event->comm_size = size;
+
+        comm_event->event.header.size = sizeof(comm_event->event) + size;
+
+        cpuctx = &get_cpu_var(perf_cpu_context);
+        perf_counter_comm_ctx(&cpuctx->ctx, comm_event);
+        put_cpu_var(perf_cpu_context);
+
+        rcu_read_lock();
+        /*
+         * doesn't really matter which of the child contexts the
+         * events ends up in.
+         */
+        ctx = rcu_dereference(current->perf_counter_ctxp);
+        if (ctx)
+                perf_counter_comm_ctx(ctx, comm_event);
+        rcu_read_unlock();
+}
+
+void perf_counter_comm(struct task_struct *task)
+{
+        struct perf_comm_event comm_event;
+
+        if (!atomic_read(&nr_comm_counters))
+                return;
+
+        comm_event = (struct perf_comm_event){
+                .task   = task,
+                .event  = {
+                        .header = { .type = PERF_EVENT_COMM, },
+                },
+        };
+
+        perf_counter_comm_event(&comm_event);
+}
+
+/*
+ * mmap tracking
+ */
+
+struct perf_mmap_event {
+        struct vm_area_struct   *vma;
+
+        const char              *file_name;
+        int                     file_size;
+
+        struct {
+                struct perf_event_header        header;
+
+                u32                             pid;
+                u32                             tid;
+                u64                             start;
+                u64                             len;
+                u64                             pgoff;
+        } event;
+};
+
+static void perf_counter_mmap_output(struct perf_counter *counter,
+                                     struct perf_mmap_event *mmap_event)
+{
+        struct perf_output_handle handle;
+        int size = mmap_event->event.header.size;
+        int ret = perf_output_begin(&handle, counter, size, 0, 0);
+
+        if (ret)
+                return;
+
+        mmap_event->event.pid = perf_counter_pid(counter, current);
+        mmap_event->event.tid = perf_counter_tid(counter, current);
+
+        perf_output_put(&handle, mmap_event->event);
+        perf_output_copy(&handle, mmap_event->file_name,
+                                   mmap_event->file_size);
+        perf_output_end(&handle);
+}
+
+static int perf_counter_mmap_match(struct perf_counter *counter,
+                                   struct perf_mmap_event *mmap_event)
+{
+        if (counter->attr.mmap)
+                return 1;
+
+        return 0;
+}
+
+static void perf_counter_mmap_ctx(struct perf_counter_context *ctx,
+                                  struct perf_mmap_event *mmap_event)
+{
+        struct perf_counter *counter;
+
+        if (system_state != SYSTEM_RUNNING || list_empty(&ctx->event_list))
+                return;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(counter, &ctx->event_list, event_entry) {
+                if (perf_counter_mmap_match(counter, mmap_event))
+                        perf_counter_mmap_output(counter, mmap_event);
+        }
+        rcu_read_unlock();
+}
+
+static void perf_counter_mmap_event(struct perf_mmap_event *mmap_event)
+{
+        struct perf_cpu_context *cpuctx;
+        struct perf_counter_context *ctx;
+        struct vm_area_struct *vma = mmap_event->vma;
+        struct file *file = vma->vm_file;
+        unsigned int size;
+        char tmp[16];
+        char *buf = NULL;
+        const char *name;
+
+        if (file) {
+                buf = kzalloc(PATH_MAX, GFP_KERNEL);
+                if (!buf) {
+                        name = strncpy(tmp, "//enomem", sizeof(tmp));
+                        goto got_name;
+                }
+                name = d_path(&file->f_path, buf, PATH_MAX);
+                if (IS_ERR(name)) {
+                        name = strncpy(tmp, "//toolong", sizeof(tmp));
+                        goto got_name;
+                }
+        } else {
+                name = arch_vma_name(mmap_event->vma);
+                if (name)
+                        goto got_name;
+
+                if (!vma->vm_mm) {
+                        name = strncpy(tmp, "[vdso]", sizeof(tmp));
+                        goto got_name;
+                }
+
+                name = strncpy(tmp, "//anon", sizeof(tmp));
+                goto got_name;
+        }
+
+got_name:
+        size = ALIGN(strlen(name)+1, sizeof(u64));
+
+        mmap_event->file_name = name;
+        mmap_event->file_size = size;
+
+        mmap_event->event.header.size = sizeof(mmap_event->event) + size;
+
+        cpuctx = &get_cpu_var(perf_cpu_context);
+        perf_counter_mmap_ctx(&cpuctx->ctx, mmap_event);
+        put_cpu_var(perf_cpu_context);
+
+        rcu_read_lock();
+        /*
+         * doesn't really matter which of the child contexts the
+         * events ends up in.
+         */
+        ctx = rcu_dereference(current->perf_counter_ctxp);
+        if (ctx)
+                perf_counter_mmap_ctx(ctx, mmap_event);
+        rcu_read_unlock();
+
+        kfree(buf);
+}
+
+void __perf_counter_mmap(struct vm_area_struct *vma)
+{
+        struct perf_mmap_event mmap_event;
+
+        if (!atomic_read(&nr_mmap_counters))
+                return;
+
+        mmap_event = (struct perf_mmap_event){
+                .vma    = vma,
+                .event  = {
+                        .header = { .type = PERF_EVENT_MMAP, },
+                        .start  = vma->vm_start,
+                        .len    = vma->vm_end - vma->vm_start,
+                        .pgoff  = vma->vm_pgoff,
+                },
+        };
+
+        perf_counter_mmap_event(&mmap_event);
+}
+
+/*
+ * Log sample_period changes so that analyzing tools can re-normalize the
+ * event flow.
+ */
+
+struct freq_event {
+        struct perf_event_header        header;
+        u64                             time;
+        u64                             id;
+        u64                             period;
+};
+
+static void perf_log_period(struct perf_counter *counter, u64 period)
+{
+        struct perf_output_handle handle;
+        struct freq_event event;
+        int ret;
+
+        if (counter->hw.sample_period == period)
+                return;
+
+        if (counter->attr.sample_type & PERF_SAMPLE_PERIOD)
+                return;
+
+        event = (struct freq_event) {
+                .header = {
+                        .type = PERF_EVENT_PERIOD,
+                        .misc = 0,
+                        .size = sizeof(event),
+                },
+                .time = sched_clock(),
+                .id = counter->id,
+                .period = period,
+        };
+
+        ret = perf_output_begin(&handle, counter, sizeof(event), 1, 0);
+        if (ret)
+                return;
+
+        perf_output_put(&handle, event);
+        perf_output_end(&handle);
+}
+
+/*
+ * IRQ throttle logging
+ */
+
+static void perf_log_throttle(struct perf_counter *counter, int enable)
+{
+        struct perf_output_handle handle;
+        int ret;
+
+        struct {
+                struct perf_event_header        header;
+                u64                             time;
+                u64                             id;
+        } throttle_event = {
+                .header = {
+                        .type = PERF_EVENT_THROTTLE + 1,
+                        .misc = 0,
+                        .size = sizeof(throttle_event),
+                },
+                .time   = sched_clock(),
+                .id     = counter->id,
+        };
+
+        ret = perf_output_begin(&handle, counter, sizeof(throttle_event), 1, 0);
+        if (ret)
+                return;
+
+        perf_output_put(&handle, throttle_event);
+        perf_output_end(&handle);
+}
+
+/*
+ * Generic counter overflow handling, sampling.
+ */
+
+int perf_counter_overflow(struct perf_counter *counter, int nmi,
+                          struct perf_sample_data *data)
+{
+        int events = atomic_read(&counter->event_limit);
+        int throttle = counter->pmu->unthrottle != NULL;
+        struct hw_perf_counter *hwc = &counter->hw;
+        int ret = 0;
+
+        if (!throttle) {
+                hwc->interrupts++;
+        } else {
+                if (hwc->interrupts != MAX_INTERRUPTS) {
+                        hwc->interrupts++;
+                        if (HZ * hwc->interrupts >
+                                        (u64)sysctl_perf_counter_sample_rate) {
+                                hwc->interrupts = MAX_INTERRUPTS;
+                                perf_log_throttle(counter, 0);
+                                ret = 1;
+                        }
+                } else {
+                        /*
+                         * Keep re-disabling counters even though on the previous
+                         * pass we disabled it - just in case we raced with a
+                         * sched-in and the counter got enabled again:
+                         */
+                        ret = 1;
+                }
+        }
+
+        if (counter->attr.freq) {
+                u64 now = sched_clock();
+                s64 delta = now - hwc->freq_stamp;
+
+                hwc->freq_stamp = now;
+
+                if (delta > 0 && delta < TICK_NSEC)
+                        perf_adjust_period(counter, NSEC_PER_SEC / (int)delta);
+        }
+
+        /*
+         * XXX event_limit might not quite work as expected on inherited
+         * counters
+         */
+
+        counter->pending_kill = POLL_IN;
+        if (events && atomic_dec_and_test(&counter->event_limit)) {
+                ret = 1;
+                counter->pending_kill = POLL_HUP;
+                if (nmi) {
+                        counter->pending_disable = 1;
+                        perf_pending_queue(&counter->pending,
+                                           perf_pending_counter);
+                } else
+                        perf_counter_disable(counter);
+        }
+
+        perf_counter_output(counter, nmi, data);
+        return ret;
+}
+
+/*
+ * Generic software counter infrastructure
+ */
+
+static void perf_swcounter_update(struct perf_counter *counter)
+{
+        struct hw_perf_counter *hwc = &counter->hw;
+        u64 prev, now;
+        s64 delta;
+
+again:
+        prev = atomic64_read(&hwc->prev_count);
+        now = atomic64_read(&hwc->count);
+        if (atomic64_cmpxchg(&hwc->prev_count, prev, now) != prev)
+                goto again;
+
+        delta = now - prev;
+
+        atomic64_add(delta, &counter->count);
+        atomic64_sub(delta, &hwc->period_left);
+}
+
+static void perf_swcounter_set_period(struct perf_counter *counter)
+{
+        struct hw_perf_counter *hwc = &counter->hw;
+        s64 left = atomic64_read(&hwc->period_left);
+        s64 period = hwc->sample_period;
+
+        if (unlikely(left <= -period)) {
+                left = period;
+                atomic64_set(&hwc->period_left, left);
+                hwc->last_period = period;
+        }
+
+        if (unlikely(left <= 0)) {
+                left += period;
+                atomic64_add(period, &hwc->period_left);
+                hwc->last_period = period;
+        }
+
+        atomic64_set(&hwc->prev_count, -left);
+        atomic64_set(&hwc->count, -left);
+}
+
+static enum hrtimer_restart perf_swcounter_hrtimer(struct hrtimer *hrtimer)
+{
+        enum hrtimer_restart ret = HRTIMER_RESTART;
+        struct perf_sample_data data;
+        struct perf_counter *counter;
+        u64 period;
+
+        counter = container_of(hrtimer, struct perf_counter, hw.hrtimer);
+        counter->pmu->read(counter);
+
+        data.addr = 0;
+        data.regs = get_irq_regs();
+        /*
+         * In case we exclude kernel IPs or are somehow not in interrupt
+         * context, provide the next best thing, the user IP.
+         */
+        if ((counter->attr.exclude_kernel || !data.regs) &&
+                        !counter->attr.exclude_user)
+                data.regs = task_pt_regs(current);
+
+        if (data.regs) {
+                if (perf_counter_overflow(counter, 0, &data))
+                        ret = HRTIMER_NORESTART;
+        }
+
+        period = max_t(u64, 10000, counter->hw.sample_period);
+        hrtimer_forward_now(hrtimer, ns_to_ktime(period));
+
+        return ret;
+}
+
+static void perf_swcounter_overflow(struct perf_counter *counter,
+                                    int nmi, struct perf_sample_data *data)
+{
+        data->period = counter->hw.last_period;
+
+        perf_swcounter_update(counter);
+        perf_swcounter_set_period(counter);
+        if (perf_counter_overflow(counter, nmi, data))
+                /* soft-disable the counter */
+                ;
+}
+
+static int perf_swcounter_is_counting(struct perf_counter *counter)
+{
+        struct perf_counter_context *ctx;
+        unsigned long flags;
+        int count;
+
+        if (counter->state == PERF_COUNTER_STATE_ACTIVE)
+                return 1;
+
+        if (counter->state != PERF_COUNTER_STATE_INACTIVE)
+                return 0;
+
+        /*
+         * If the counter is inactive, it could be just because
+         * its task is scheduled out, or because it's in a group
+         * which could not go on the PMU.  We want to count in
+         * the first case but not the second.  If the context is
+         * currently active then an inactive software counter must
+         * be the second case.  If it's not currently active then
+         * we need to know whether the counter was active when the
+         * context was last active, which we can determine by
+         * comparing counter->tstamp_stopped with ctx->time.
+         *
+         * We are within an RCU read-side critical section,
+         * which protects the existence of *ctx.
+         */
+        ctx = counter->ctx;
+        spin_lock_irqsave(&ctx->lock, flags);
+        count = 1;
+        /* Re-check state now we have the lock */
+        if (counter->state < PERF_COUNTER_STATE_INACTIVE ||
+            counter->ctx->is_active ||
+            counter->tstamp_stopped < ctx->time)
+                count = 0;
+        spin_unlock_irqrestore(&ctx->lock, flags);
+        return count;
+}
+
+static int perf_swcounter_match(struct perf_counter *counter,
+                                enum perf_type_id type,
+                                u32 event, struct pt_regs *regs)
+{
+        if (!perf_swcounter_is_counting(counter))
+                return 0;
+
+        if (counter->attr.type != type)
+                return 0;
+        if (counter->attr.config != event)
+                return 0;
+
+        if (regs) {
+                if (counter->attr.exclude_user && user_mode(regs))
+                        return 0;
+
+                if (counter->attr.exclude_kernel && !user_mode(regs))
+                        return 0;
+        }
+
+        return 1;
+}
+
+static void perf_swcounter_add(struct perf_counter *counter, u64 nr,
+                               int nmi, struct perf_sample_data *data)
+{
+        int neg = atomic64_add_negative(nr, &counter->hw.count);
+
+        if (counter->hw.sample_period && !neg && data->regs)
+                perf_swcounter_overflow(counter, nmi, data);
+}
+
+static void perf_swcounter_ctx_event(struct perf_counter_context *ctx,
+                                     enum perf_type_id type,
+                                     u32 event, u64 nr, int nmi,
+                                     struct perf_sample_data *data)
+{
+        struct perf_counter *counter;
+
+        if (system_state != SYSTEM_RUNNING || list_empty(&ctx->event_list))
+                return;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(counter, &ctx->event_list, event_entry) {
+                if (perf_swcounter_match(counter, type, event, data->regs))
+                        perf_swcounter_add(counter, nr, nmi, data);
+        }
+        rcu_read_unlock();
+}
+
+static int *perf_swcounter_recursion_context(struct perf_cpu_context *cpuctx)
+{
+        if (in_nmi())
+                return &cpuctx->recursion[3];
+
+        if (in_irq())
+                return &cpuctx->recursion[2];
+
+        if (in_softirq())
+                return &cpuctx->recursion[1];
+
+        return &cpuctx->recursion[0];
+}
+
+static void do_perf_swcounter_event(enum perf_type_id type, u32 event,
+                                    u64 nr, int nmi,
+                                    struct perf_sample_data *data)
+{
+        struct perf_cpu_context *cpuctx = &get_cpu_var(perf_cpu_context);
+        int *recursion = perf_swcounter_recursion_context(cpuctx);
+        struct perf_counter_context *ctx;
+
+        if (*recursion)
+                goto out;
+
+        (*recursion)++;
+        barrier();
+
+        perf_swcounter_ctx_event(&cpuctx->ctx, type, event,
+                                 nr, nmi, data);
+        rcu_read_lock();
+        /*
+         * doesn't really matter which of the child contexts the
+         * events ends up in.
+         */
+        ctx = rcu_dereference(current->perf_counter_ctxp);
+        if (ctx)
+                perf_swcounter_ctx_event(ctx, type, event, nr, nmi, data);
+        rcu_read_unlock();
+
+        barrier();
+        (*recursion)--;
+
+out:
+        put_cpu_var(perf_cpu_context);
+}
+
+void
+perf_swcounter_event(u32 event, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
+{
+        struct perf_sample_data data = {
+                .regs = regs,
+                .addr = addr,
+        };
+
+        do_perf_swcounter_event(PERF_TYPE_SOFTWARE, event, nr, nmi, &data);
+}
+
+static void perf_swcounter_read(struct perf_counter *counter)
+{
+        perf_swcounter_update(counter);
+}
+
+static int perf_swcounter_enable(struct perf_counter *counter)
+{
+        perf_swcounter_set_period(counter);
+        return 0;
+}
+
+static void perf_swcounter_disable(struct perf_counter *counter)
+{
+        perf_swcounter_update(counter);
+}
+
+static const struct pmu perf_ops_generic = {
+        .enable         = perf_swcounter_enable,
+        .disable        = perf_swcounter_disable,
+        .read           = perf_swcounter_read,
+};
+
+/*
+ * Software counter: cpu wall time clock
+ */
+
+static void cpu_clock_perf_counter_update(struct perf_counter *counter)
+{
+        int cpu = raw_smp_processor_id();
+        s64 prev;
+        u64 now;
+
+        now = cpu_clock(cpu);
+        prev = atomic64_read(&counter->hw.prev_count);
+        atomic64_set(&counter->hw.prev_count, now);
+        atomic64_add(now - prev, &counter->count);
+}
+
+static int cpu_clock_perf_counter_enable(struct perf_counter *counter)
+{
+        struct hw_perf_counter *hwc = &counter->hw;
+        int cpu = raw_smp_processor_id();
+
+        atomic64_set(&hwc->prev_count, cpu_clock(cpu));
+        hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+        hwc->hrtimer.function = perf_swcounter_hrtimer;
+        if (hwc->sample_period) {
+                u64 period = max_t(u64, 10000, hwc->sample_period);
+                __hrtimer_start_range_ns(&hwc->hrtimer,
+                                ns_to_ktime(period), 0,
+                                HRTIMER_MODE_REL, 0);
+        }
+
+        return 0;
+}
+
+static void cpu_clock_perf_counter_disable(struct perf_counter *counter)
+{
+        if (counter->hw.sample_period)
+                hrtimer_cancel(&counter->hw.hrtimer);
+        cpu_clock_perf_counter_update(counter);
+}
+
+static void cpu_clock_perf_counter_read(struct perf_counter *counter)
+{
+        cpu_clock_perf_counter_update(counter);
+}
+
+static const struct pmu perf_ops_cpu_clock = {
+        .enable         = cpu_clock_perf_counter_enable,
+        .disable        = cpu_clock_perf_counter_disable,
+        .read           = cpu_clock_perf_counter_read,
+};
+
+/*
+ * Software counter: task time clock
+ */
+
+static void task_clock_perf_counter_update(struct perf_counter *counter, u64 now)
+{
+        u64 prev;
+        s64 delta;
+
+        prev = atomic64_xchg(&counter->hw.prev_count, now);
+        delta = now - prev;
+        atomic64_add(delta, &counter->count);
+}
+
+static int task_clock_perf_counter_enable(struct perf_counter *counter)
+{
+        struct hw_perf_counter *hwc = &counter->hw;
+        u64 now;
+
+        now = counter->ctx->time;
+
+        atomic64_set(&hwc->prev_count, now);
+        hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+        hwc->hrtimer.function = perf_swcounter_hrtimer;
+        if (hwc->sample_period) {
+                u64 period = max_t(u64, 10000, hwc->sample_period);
+                __hrtimer_start_range_ns(&hwc->hrtimer,
+                                ns_to_ktime(period), 0,
+                                HRTIMER_MODE_REL, 0);
+        }
+
+        return 0;
+}
+
+static void task_clock_perf_counter_disable(struct perf_counter *counter)
+{
+        if (counter->hw.sample_period)
+                hrtimer_cancel(&counter->hw.hrtimer);
+        task_clock_perf_counter_update(counter, counter->ctx->time);
+
+}
+
+static void task_clock_perf_counter_read(struct perf_counter *counter)
+{
+        u64 time;
+
+        if (!in_nmi()) {
+                update_context_time(counter->ctx);
+                time = counter->ctx->time;
+        } else {
+                u64 now = perf_clock();
+                u64 delta = now - counter->ctx->timestamp;
+                time = counter->ctx->time + delta;
+        }
+
+        task_clock_perf_counter_update(counter, time);
+}
+
+static const struct pmu perf_ops_task_clock = {
+        .enable         = task_clock_perf_counter_enable,
+        .disable        = task_clock_perf_counter_disable,
+        .read           = task_clock_perf_counter_read,
+};
+
+#ifdef CONFIG_EVENT_PROFILE
+void perf_tpcounter_event(int event_id)
+{
+        struct perf_sample_data data = {
+                .regs = get_irq_regs();
+                .addr = 0,
+        };
+
+        if (!data.regs)
+                data.regs = task_pt_regs(current);
+
+        do_perf_swcounter_event(PERF_TYPE_TRACEPOINT, event_id, 1, 1, &data);
+}
+EXPORT_SYMBOL_GPL(perf_tpcounter_event);
+
+extern int ftrace_profile_enable(int);
+extern void ftrace_profile_disable(int);
+
+static void tp_perf_counter_destroy(struct perf_counter *counter)
+{
+        ftrace_profile_disable(perf_event_id(&counter->attr));
+}
+
+static const struct pmu *tp_perf_counter_init(struct perf_counter *counter)
+{
+        int event_id = perf_event_id(&counter->attr);
+        int ret;
+
+        ret = ftrace_profile_enable(event_id);
+        if (ret)
+                return NULL;
+
+        counter->destroy = tp_perf_counter_destroy;
+
+        return &perf_ops_generic;
+}
+#else
+static const struct pmu *tp_perf_counter_init(struct perf_counter *counter)
+{
+        return NULL;
+}
+#endif
+
+static const struct pmu *sw_perf_counter_init(struct perf_counter *counter)
+{
+        const struct pmu *pmu = NULL;
+
+        /*
+         * Software counters (currently) can't in general distinguish
+         * between user, kernel and hypervisor events.
+         * However, context switches and cpu migrations are considered
+         * to be kernel events, and page faults are never hypervisor
+         * events.
+         */
+        switch (counter->attr.config) {
+        case PERF_COUNT_SW_CPU_CLOCK:
+                pmu = &perf_ops_cpu_clock;
+
+                break;
+        case PERF_COUNT_SW_TASK_CLOCK:
+                /*
+                 * If the user instantiates this as a per-cpu counter,
+                 * use the cpu_clock counter instead.
+                 */
+                if (counter->ctx->task)
+                        pmu = &perf_ops_task_clock;
+                else
+                        pmu = &perf_ops_cpu_clock;
+
+                break;
+        case PERF_COUNT_SW_PAGE_FAULTS:
+        case PERF_COUNT_SW_PAGE_FAULTS_MIN:
+        case PERF_COUNT_SW_PAGE_FAULTS_MAJ:
+        case PERF_COUNT_SW_CONTEXT_SWITCHES:
+        case PERF_COUNT_SW_CPU_MIGRATIONS:
+                pmu = &perf_ops_generic;
+                break;
+        }
+
+        return pmu;
+}
+
+/*
+ * Allocate and initialize a counter structure
+ */
+static struct perf_counter *
+perf_counter_alloc(struct perf_counter_attr *attr,
+                   int cpu,
+                   struct perf_counter_context *ctx,
+                   struct perf_counter *group_leader,
+                   gfp_t gfpflags)
+{
+        const struct pmu *pmu;
+        struct perf_counter *counter;
+        struct hw_perf_counter *hwc;
+        long err;
+
+        counter = kzalloc(sizeof(*counter), gfpflags);
+        if (!counter)
+                return ERR_PTR(-ENOMEM);
+
+        /*
+         * Single counters are their own group leaders, with an
+         * empty sibling list:
+         */
+        if (!group_leader)
+                group_leader = counter;
+
+        mutex_init(&counter->child_mutex);
+        INIT_LIST_HEAD(&counter->child_list);
+
+        INIT_LIST_HEAD(&counter->list_entry);
+        INIT_LIST_HEAD(&counter->event_entry);
+        INIT_LIST_HEAD(&counter->sibling_list);
+        init_waitqueue_head(&counter->waitq);
+
+        mutex_init(&counter->mmap_mutex);
+
+        counter->cpu            = cpu;
+        counter->attr           = *attr;
+        counter->group_leader   = group_leader;
+        counter->pmu            = NULL;
+        counter->ctx            = ctx;
+        counter->oncpu          = -1;
+
+        counter->ns             = get_pid_ns(current->nsproxy->pid_ns);
+        counter->id             = atomic64_inc_return(&perf_counter_id);
+
+        counter->state          = PERF_COUNTER_STATE_INACTIVE;
+
+        if (attr->disabled)
+                counter->state = PERF_COUNTER_STATE_OFF;
+
+        pmu = NULL;
+
+        hwc = &counter->hw;
+        hwc->sample_period = attr->sample_period;
+        if (attr->freq && attr->sample_freq)
+                hwc->sample_period = 1;
+
+        atomic64_set(&hwc->period_left, hwc->sample_period);
+
+        /*
+         * we currently do not support PERF_SAMPLE_GROUP on inherited counters
+         */
+        if (attr->inherit && (attr->sample_type & PERF_SAMPLE_GROUP))
+                goto done;
+
+        switch (attr->type) {
+        case PERF_TYPE_RAW:
+        case PERF_TYPE_HARDWARE:
+        case PERF_TYPE_HW_CACHE:
+                pmu = hw_perf_counter_init(counter);
+                break;
+
+        case PERF_TYPE_SOFTWARE:
+                pmu = sw_perf_counter_init(counter);
+                break;
+
+        case PERF_TYPE_TRACEPOINT:
+                pmu = tp_perf_counter_init(counter);
+                break;
+
+        default:
+                break;
+        }
+done:
+        err = 0;
+        if (!pmu)
+                err = -EINVAL;
+        else if (IS_ERR(pmu))
+                err = PTR_ERR(pmu);
+
+        if (err) {
+                if (counter->ns)
+                        put_pid_ns(counter->ns);
+                kfree(counter);
+                return ERR_PTR(err);
+        }
+
+        counter->pmu = pmu;
+
+        atomic_inc(&nr_counters);
+        if (counter->attr.mmap)
+                atomic_inc(&nr_mmap_counters);
+        if (counter->attr.comm)
+                atomic_inc(&nr_comm_counters);
+
+        return counter;
+}
+
+static int perf_copy_attr(struct perf_counter_attr __user *uattr,
+                          struct perf_counter_attr *attr)
+{
+        int ret;
+        u32 size;
+
+        if (!access_ok(VERIFY_WRITE, uattr, PERF_ATTR_SIZE_VER0))
+                return -EFAULT;
+
+        /*
+         * zero the full structure, so that a short copy will be nice.
+         */
+        memset(attr, 0, sizeof(*attr));
+
+        ret = get_user(size, &uattr->size);
+        if (ret)
+                return ret;
+
+        if (size > PAGE_SIZE)   /* silly large */
+                goto err_size;
+
+        if (!size)              /* abi compat */
+                size = PERF_ATTR_SIZE_VER0;
+
+        if (size < PERF_ATTR_SIZE_VER0)
+                goto err_size;
+
+        /*
+         * If we're handed a bigger struct than we know of,
+         * ensure all the unknown bits are 0.
+         */
+        if (size > sizeof(*attr)) {
+                unsigned long val;
+                unsigned long __user *addr;
+                unsigned long __user *end;
+
+                addr = PTR_ALIGN((void __user *)uattr + sizeof(*attr),
+                                sizeof(unsigned long));
+                end  = PTR_ALIGN((void __user *)uattr + size,
+                                sizeof(unsigned long));
+
+                for (; addr < end; addr += sizeof(unsigned long)) {
+                        ret = get_user(val, addr);
+                        if (ret)
+                                return ret;
+                        if (val)
+                                goto err_size;
+                }
+        }
+
+        ret = copy_from_user(attr, uattr, size);
+        if (ret)
+                return -EFAULT;
+
+        /*
+         * If the type exists, the corresponding creation will verify
+         * the attr->config.
+         */
+        if (attr->type >= PERF_TYPE_MAX)
+                return -EINVAL;
+
+        if (attr->__reserved_1 || attr->__reserved_2 || attr->__reserved_3)
+                return -EINVAL;
+
+        if (attr->sample_type & ~(PERF_SAMPLE_MAX-1))
+                return -EINVAL;
+
+        if (attr->read_format & ~(PERF_FORMAT_MAX-1))
+                return -EINVAL;
+
+out:
+        return ret;
+
+err_size:
+        put_user(sizeof(*attr), &uattr->size);
+        ret = -E2BIG;
+        goto out;
+}
+
+/**
+ * sys_perf_counter_open - open a performance counter, associate it to a task/cpu
+ *
+ * @attr_uptr:  event type attributes for monitoring/sampling
+ * @pid:                target pid
+ * @cpu:                target cpu
+ * @group_fd:           group leader counter fd
+ */
+SYSCALL_DEFINE5(perf_counter_open,
+                struct perf_counter_attr __user *, attr_uptr,
+                pid_t, pid, int, cpu, int, group_fd, unsigned long, flags)
+{
+        struct perf_counter *counter, *group_leader;
+        struct perf_counter_attr attr;
+        struct perf_counter_context *ctx;
+        struct file *counter_file = NULL;
+        struct file *group_file = NULL;
+        int fput_needed = 0;
+        int fput_needed2 = 0;
+        int ret;
+
+        /* for future expandability... */
+        if (flags)
+                return -EINVAL;
+
+        ret = perf_copy_attr(attr_uptr, &attr);
+        if (ret)
+                return ret;
+
+        if (!attr.exclude_kernel) {
+                if (perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN))
+                        return -EACCES;
+        }
+
+        if (attr.freq) {
+                if (attr.sample_freq > sysctl_perf_counter_sample_rate)
+                        return -EINVAL;
+        }
+
+        /*
+         * Get the target context (task or percpu):
+         */
+        ctx = find_get_context(pid, cpu);
+        if (IS_ERR(ctx))
+                return PTR_ERR(ctx);
+
+        /*
+         * Look up the group leader (we will attach this counter to it):
+         */
+        group_leader = NULL;
+        if (group_fd != -1) {
+                ret = -EINVAL;
+                group_file = fget_light(group_fd, &fput_needed);
+                if (!group_file)
+                        goto err_put_context;
+                if (group_file->f_op != &perf_fops)
+                        goto err_put_context;
+
+                group_leader = group_file->private_data;
+                /*
+                 * Do not allow a recursive hierarchy (this new sibling
+                 * becoming part of another group-sibling):
+                 */
+                if (group_leader->group_leader != group_leader)
+                        goto err_put_context;
+                /*
+                 * Do not allow to attach to a group in a different
+                 * task or CPU context:
+                 */
+                if (group_leader->ctx != ctx)
+                        goto err_put_context;
+                /*
+                 * Only a group leader can be exclusive or pinned
+                 */
+                if (attr.exclusive || attr.pinned)
+                        goto err_put_context;
+        }
+
+        counter = perf_counter_alloc(&attr, cpu, ctx, group_leader,
+                                     GFP_KERNEL);
+        ret = PTR_ERR(counter);
+        if (IS_ERR(counter))
+                goto err_put_context;
+
+        ret = anon_inode_getfd("[perf_counter]", &perf_fops, counter, 0);
+        if (ret < 0)
+                goto err_free_put_context;
+
+        counter_file = fget_light(ret, &fput_needed2);
+        if (!counter_file)
+                goto err_free_put_context;
+
+        counter->filp = counter_file;
+        WARN_ON_ONCE(ctx->parent_ctx);
+        mutex_lock(&ctx->mutex);
+        perf_install_in_context(ctx, counter, cpu);
+        ++ctx->generation;
+        mutex_unlock(&ctx->mutex);
+
+        counter->owner = current;
+        get_task_struct(current);
+        mutex_lock(&current->perf_counter_mutex);
+        list_add_tail(&counter->owner_entry, &current->perf_counter_list);
+        mutex_unlock(&current->perf_counter_mutex);
+
+        fput_light(counter_file, fput_needed2);
+
+out_fput:
+        fput_light(group_file, fput_needed);
+
+        return ret;
+
+err_free_put_context:
+        kfree(counter);
+
+err_put_context:
+        put_ctx(ctx);
+
+        goto out_fput;
+}
+
+/*
+ * inherit a counter from parent task to child task:
+ */
+static struct perf_counter *
+inherit_counter(struct perf_counter *parent_counter,
+              struct task_struct *parent,
+              struct perf_counter_context *parent_ctx,
+              struct task_struct *child,
+              struct perf_counter *group_leader,
+              struct perf_counter_context *child_ctx)
+{
+        struct perf_counter *child_counter;
+
+        /*
+         * Instead of creating recursive hierarchies of counters,
+         * we link inherited counters back to the original parent,
+         * which has a filp for sure, which we use as the reference
+         * count:
+         */
+        if (parent_counter->parent)
+                parent_counter = parent_counter->parent;
+
+        child_counter = perf_counter_alloc(&parent_counter->attr,
+                                           parent_counter->cpu, child_ctx,
+                                           group_leader, GFP_KERNEL);
+        if (IS_ERR(child_counter))
+                return child_counter;
+        get_ctx(child_ctx);
+
+        /*
+         * Make the child state follow the state of the parent counter,
+         * not its attr.disabled bit.  We hold the parent's mutex,
+         * so we won't race with perf_counter_{en, dis}able_family.
+         */
+        if (parent_counter->state >= PERF_COUNTER_STATE_INACTIVE)
+                child_counter->state = PERF_COUNTER_STATE_INACTIVE;
+        else
+                child_counter->state = PERF_COUNTER_STATE_OFF;
+
+        if (parent_counter->attr.freq)
+                child_counter->hw.sample_period = parent_counter->hw.sample_period;
+
+        /*
+         * Link it up in the child's context:
+         */
+        add_counter_to_ctx(child_counter, child_ctx);
+
+        child_counter->parent = parent_counter;
+        /*
+         * inherit into child's child as well:
+         */
+        child_counter->attr.inherit = 1;
+
+        /*
+         * Get a reference to the parent filp - we will fput it
+         * when the child counter exits. This is safe to do because
+         * we are in the parent and we know that the filp still
+         * exists and has a nonzero count:
+         */
+        atomic_long_inc(&parent_counter->filp->f_count);
+
+        /*
+         * Link this into the parent counter's child list
+         */
+        WARN_ON_ONCE(parent_counter->ctx->parent_ctx);
+        mutex_lock(&parent_counter->child_mutex);
+        list_add_tail(&child_counter->child_list, &parent_counter->child_list);
+        mutex_unlock(&parent_counter->child_mutex);
+
+        return child_counter;
+}
+
+static int inherit_group(struct perf_counter *parent_counter,
+              struct task_struct *parent,
+              struct perf_counter_context *parent_ctx,
+              struct task_struct *child,
+              struct perf_counter_context *child_ctx)
+{
+        struct perf_counter *leader;
+        struct perf_counter *sub;
+        struct perf_counter *child_ctr;
+
+        leader = inherit_counter(parent_counter, parent, parent_ctx,
+                                 child, NULL, child_ctx);
+        if (IS_ERR(leader))
+                return PTR_ERR(leader);
+        list_for_each_entry(sub, &parent_counter->sibling_list, list_entry) {
+                child_ctr = inherit_counter(sub, parent, parent_ctx,
+                                            child, leader, child_ctx);
+                if (IS_ERR(child_ctr))
+                        return PTR_ERR(child_ctr);
+        }
+        return 0;
+}
+
+static void sync_child_counter(struct perf_counter *child_counter,
+                               struct perf_counter *parent_counter)
+{
+        u64 child_val;
+
+        child_val = atomic64_read(&child_counter->count);
+
+        /*
+         * Add back the child's count to the parent's count:
+         */
+        atomic64_add(child_val, &parent_counter->count);
+        atomic64_add(child_counter->total_time_enabled,
+                     &parent_counter->child_total_time_enabled);
+        atomic64_add(child_counter->total_time_running,
+                     &parent_counter->child_total_time_running);
+
+        /*
+         * Remove this counter from the parent's list
+         */
+        WARN_ON_ONCE(parent_counter->ctx->parent_ctx);
+        mutex_lock(&parent_counter->child_mutex);
+        list_del_init(&child_counter->child_list);
+        mutex_unlock(&parent_counter->child_mutex);
+
+        /*
+         * Release the parent counter, if this was the last
+         * reference to it.
+         */
+        fput(parent_counter->filp);
+}
+
+static void
+__perf_counter_exit_task(struct perf_counter *child_counter,
+                         struct perf_counter_context *child_ctx)
+{
+        struct perf_counter *parent_counter;
+
+        update_counter_times(child_counter);
+        perf_counter_remove_from_context(child_counter);
+
+        parent_counter = child_counter->parent;
+        /*
+         * It can happen that parent exits first, and has counters
+         * that are still around due to the child reference. These
+         * counters need to be zapped - but otherwise linger.
+         */
+        if (parent_counter) {
+                sync_child_counter(child_counter, parent_counter);
+                free_counter(child_counter);
+        }
+}
+
+/*
+ * When a child task exits, feed back counter values to parent counters.
+ */
+void perf_counter_exit_task(struct task_struct *child)
+{
+        struct perf_counter *child_counter, *tmp;
+        struct perf_counter_context *child_ctx;
+        unsigned long flags;
+
+        if (likely(!child->perf_counter_ctxp))
+                return;
+
+        local_irq_save(flags);
+        /*
+         * We can't reschedule here because interrupts are disabled,
+         * and either child is current or it is a task that can't be
+         * scheduled, so we are now safe from rescheduling changing
+         * our context.
+         */
+        child_ctx = child->perf_counter_ctxp;
+        __perf_counter_task_sched_out(child_ctx);
+
+        /*
+         * Take the context lock here so that if find_get_context is
+         * reading child->perf_counter_ctxp, we wait until it has
+         * incremented the context's refcount before we do put_ctx below.
+         */
+        spin_lock(&child_ctx->lock);
+        child->perf_counter_ctxp = NULL;
+        if (child_ctx->parent_ctx) {
+                /*
+                 * This context is a clone; unclone it so it can't get
+                 * swapped to another process while we're removing all
+                 * the counters from it.
+                 */
+                put_ctx(child_ctx->parent_ctx);
+                child_ctx->parent_ctx = NULL;
+        }
+        spin_unlock(&child_ctx->lock);
+        local_irq_restore(flags);
+
+        /*
+         * We can recurse on the same lock type through:
+         *
+         *   __perf_counter_exit_task()
+         *     sync_child_counter()
+         *       fput(parent_counter->filp)
+         *         perf_release()
+         *           mutex_lock(&ctx->mutex)
+         *
+         * But since its the parent context it won't be the same instance.
+         */
+        mutex_lock_nested(&child_ctx->mutex, SINGLE_DEPTH_NESTING);
+
+again:
+        list_for_each_entry_safe(child_counter, tmp, &child_ctx->counter_list,
+                                 list_entry)
+                __perf_counter_exit_task(child_counter, child_ctx);
+
+        /*
+         * If the last counter was a group counter, it will have appended all
+         * its siblings to the list, but we obtained 'tmp' before that which
+         * will still point to the list head terminating the iteration.
+         */
+        if (!list_empty(&child_ctx->counter_list))
+                goto again;
+
+        mutex_unlock(&child_ctx->mutex);
+
+        put_ctx(child_ctx);
+}
+
+/*
+ * free an unexposed, unused context as created by inheritance by
+ * init_task below, used by fork() in case of fail.
+ */
+void perf_counter_free_task(struct task_struct *task)
+{
+        struct perf_counter_context *ctx = task->perf_counter_ctxp;
+        struct perf_counter *counter, *tmp;
+
+        if (!ctx)
+                return;
+
+        mutex_lock(&ctx->mutex);
+again:
+        list_for_each_entry_safe(counter, tmp, &ctx->counter_list, list_entry) {
+                struct perf_counter *parent = counter->parent;
+
+                if (WARN_ON_ONCE(!parent))
+                        continue;
+
+                mutex_lock(&parent->child_mutex);
+                list_del_init(&counter->child_list);
+                mutex_unlock(&parent->child_mutex);
+
+                fput(parent->filp);
+
+                list_del_counter(counter, ctx);
+                free_counter(counter);
+        }
+
+        if (!list_empty(&ctx->counter_list))
+                goto again;
+
+        mutex_unlock(&ctx->mutex);
+
+        put_ctx(ctx);
+}
+
+/*
+ * Initialize the perf_counter context in task_struct
+ */
+int perf_counter_init_task(struct task_struct *child)
+{
+        struct perf_counter_context *child_ctx, *parent_ctx;
+        struct perf_counter_context *cloned_ctx;
+        struct perf_counter *counter;
+        struct task_struct *parent = current;
+        int inherited_all = 1;
+        int ret = 0;
+
+        child->perf_counter_ctxp = NULL;
+
+        mutex_init(&child->perf_counter_mutex);
+        INIT_LIST_HEAD(&child->perf_counter_list);
+
+        if (likely(!parent->perf_counter_ctxp))
+                return 0;
+
+        /*
+         * This is executed from the parent task context, so inherit
+         * counters that have been marked for cloning.
+         * First allocate and initialize a context for the child.
+         */
+
+        child_ctx = kmalloc(sizeof(struct perf_counter_context), GFP_KERNEL);
+        if (!child_ctx)
+                return -ENOMEM;
+
+        __perf_counter_init_context(child_ctx, child);
+        child->perf_counter_ctxp = child_ctx;
+        get_task_struct(child);
+
+        /*
+         * If the parent's context is a clone, pin it so it won't get
+         * swapped under us.
+         */
+        parent_ctx = perf_pin_task_context(parent);
+
+        /*
+         * No need to check if parent_ctx != NULL here; since we saw
+         * it non-NULL earlier, the only reason for it to become NULL
+         * is if we exit, and since we're currently in the middle of
+         * a fork we can't be exiting at the same time.
+         */
+
+        /*
+         * Lock the parent list. No need to lock the child - not PID
+         * hashed yet and not running, so nobody can access it.
+         */
+        mutex_lock(&parent_ctx->mutex);
+
+        /*
+         * We dont have to disable NMIs - we are only looking at
+         * the list, not manipulating it:
+         */
+        list_for_each_entry_rcu(counter, &parent_ctx->event_list, event_entry) {
+                if (counter != counter->group_leader)
+                        continue;
+
+                if (!counter->attr.inherit) {
+                        inherited_all = 0;
+                        continue;
+                }
+
+                ret = inherit_group(counter, parent, parent_ctx,
+                                             child, child_ctx);
+                if (ret) {
+                        inherited_all = 0;
+                        break;
+                }
+        }
+
+        if (inherited_all) {
+                /*
+                 * Mark the child context as a clone of the parent
+                 * context, or of whatever the parent is a clone of.
+                 * Note that if the parent is a clone, it could get
+                 * uncloned at any point, but that doesn't matter
+                 * because the list of counters and the generation
+                 * count can't have changed since we took the mutex.
+                 */
+                cloned_ctx = rcu_dereference(parent_ctx->parent_ctx);
+                if (cloned_ctx) {
+                        child_ctx->parent_ctx = cloned_ctx;
+                        child_ctx->parent_gen = parent_ctx->parent_gen;
+                } else {
+                        child_ctx->parent_ctx = parent_ctx;
+                        child_ctx->parent_gen = parent_ctx->generation;
+                }
+                get_ctx(child_ctx->parent_ctx);
+        }
+
+        mutex_unlock(&parent_ctx->mutex);
+
+        perf_unpin_context(parent_ctx);
+
+        return ret;
+}
+
+static void __cpuinit perf_counter_init_cpu(int cpu)
+{
+        struct perf_cpu_context *cpuctx;
+
+        cpuctx = &per_cpu(perf_cpu_context, cpu);
+        __perf_counter_init_context(&cpuctx->ctx, NULL);
+
+        spin_lock(&perf_resource_lock);
+        cpuctx->max_pertask = perf_max_counters - perf_reserved_percpu;
+        spin_unlock(&perf_resource_lock);
+
+        hw_perf_counter_setup(cpu);
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static void __perf_counter_exit_cpu(void *info)
+{
+        struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+        struct perf_counter_context *ctx = &cpuctx->ctx;
+        struct perf_counter *counter, *tmp;
+
+        list_for_each_entry_safe(counter, tmp, &ctx->counter_list, list_entry)
+                __perf_counter_remove_from_context(counter);
+}
+static void perf_counter_exit_cpu(int cpu)
+{
+        struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
+        struct perf_counter_context *ctx = &cpuctx->ctx;
+
+        mutex_lock(&ctx->mutex);
+        smp_call_function_single(cpu, __perf_counter_exit_cpu, NULL, 1);
+        mutex_unlock(&ctx->mutex);
+}
+#else
+static inline void perf_counter_exit_cpu(int cpu) { }
+#endif
+
+static int __cpuinit
+perf_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
+{
+        unsigned int cpu = (long)hcpu;
+
+        switch (action) {
+
+        case CPU_UP_PREPARE:
+        case CPU_UP_PREPARE_FROZEN:
+                perf_counter_init_cpu(cpu);
+                break;
+
+        case CPU_DOWN_PREPARE:
+        case CPU_DOWN_PREPARE_FROZEN:
+                perf_counter_exit_cpu(cpu);
+                break;
+
+        default:
+                break;
+        }
+
+        return NOTIFY_OK;
+}
+
+/*
+ * This has to have a higher priority than migration_notifier in sched.c.
+ */
+static struct notifier_block __cpuinitdata perf_cpu_nb = {
+        .notifier_call          = perf_cpu_notify,
+        .priority               = 20,
+};
+
+void __init perf_counter_init(void)
+{
+        perf_cpu_notify(&perf_cpu_nb, (unsigned long)CPU_UP_PREPARE,
+                        (void *)(long)smp_processor_id());
+        register_cpu_notifier(&perf_cpu_nb);
+}
+
+static ssize_t perf_show_reserve_percpu(struct sysdev_class *class, char *buf)
+{
+        return sprintf(buf, "%d\n", perf_reserved_percpu);
+}
+
+static ssize_t
+perf_set_reserve_percpu(struct sysdev_class *class,
+                        const char *buf,
+                        size_t count)
+{
+        struct perf_cpu_context *cpuctx;
+        unsigned long val;
+        int err, cpu, mpt;
+
+        err = strict_strtoul(buf, 10, &val);
+        if (err)
+                return err;
+        if (val > perf_max_counters)
+                return -EINVAL;
+
+        spin_lock(&perf_resource_lock);
+        perf_reserved_percpu = val;
+        for_each_online_cpu(cpu) {
+                cpuctx = &per_cpu(perf_cpu_context, cpu);
+                spin_lock_irq(&cpuctx->ctx.lock);
+                mpt = min(perf_max_counters - cpuctx->ctx.nr_counters,
+                          perf_max_counters - perf_reserved_percpu);
+                cpuctx->max_pertask = mpt;
+                spin_unlock_irq(&cpuctx->ctx.lock);
+        }
+        spin_unlock(&perf_resource_lock);
+
+        return count;
+}
+
+static ssize_t perf_show_overcommit(struct sysdev_class *class, 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)
+{
+        unsigned long val;
+        int err;
+
+        err = strict_strtoul(buf, 10, &val);
+        if (err)
+                return err;
+        if (val > 1)
+                return -EINVAL;
+
+        spin_lock(&perf_resource_lock);
+        perf_overcommit = val;
+        spin_unlock(&perf_resource_lock);
+
+        return count;
+}
+
+static SYSDEV_CLASS_ATTR(
+                                reserve_percpu,
+                                0644,
+                                perf_show_reserve_percpu,
+                                perf_set_reserve_percpu
+                        );
+
+static SYSDEV_CLASS_ATTR(
+                                overcommit,
+                                0644,
+                                perf_show_overcommit,
+                                perf_set_overcommit
+                        );
+
+static struct attribute *perfclass_attrs[] = {
+        &attr_reserve_percpu.attr,
+        &attr_overcommit.attr,
+        NULL
+};
+
+static struct attribute_group perfclass_attr_group = {
+        .attrs                  = perfclass_attrs,
+        .name                   = "perf_counters",
+};
+
+static int __init perf_counter_sysfs_init(void)
+{
+        return sysfs_create_group(&cpu_sysdev_class.kset.kobj,
+                                  &perfclass_attr_group);
+}
+device_initcall(perf_counter_sysfs_init);
diff --git a/kernel/pid.c b/kernel/pid.c
index b2e5f78fd281..31310b5d3f50 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -378,26 +378,15 @@ EXPORT_SYMBOL(pid_task);
 /*
  * Must be called under rcu_read_lock() or with tasklist_lock read-held.
  */
-struct task_struct *find_task_by_pid_type_ns(int type, int nr,
-                struct pid_namespace *ns)
+struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns)
 {
-        return pid_task(find_pid_ns(nr, ns), type);
+        return pid_task(find_pid_ns(nr, ns), PIDTYPE_PID);
 }
 
-EXPORT_SYMBOL(find_task_by_pid_type_ns);
-
 struct task_struct *find_task_by_vpid(pid_t vnr)
 {
-        return find_task_by_pid_type_ns(PIDTYPE_PID, vnr,
-                        current->nsproxy->pid_ns);
-}
-EXPORT_SYMBOL(find_task_by_vpid);
-
-struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns)
-{
-        return find_task_by_pid_type_ns(PIDTYPE_PID, nr, ns);
+        return find_task_by_pid_ns(vnr, current->nsproxy->pid_ns);
 }
-EXPORT_SYMBOL(find_task_by_pid_ns);
 
 struct pid *get_task_pid(struct task_struct *task, enum pid_type type)
 {
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 2d1001b4858d..821722ae58a7 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -67,9 +67,10 @@ err_alloc:
         return NULL;
 }
 
-static struct pid_namespace *create_pid_namespace(unsigned int level)
+static struct pid_namespace *create_pid_namespace(struct pid_namespace *parent_pid_ns)
 {
         struct pid_namespace *ns;
+        unsigned int level = parent_pid_ns->level + 1;
         int i;
 
         ns = kmem_cache_zalloc(pid_ns_cachep, GFP_KERNEL);
@@ -86,6 +87,7 @@ static struct pid_namespace *create_pid_namespace(unsigned int level)
 
         kref_init(&ns->kref);
         ns->level = level;
+        ns->parent = get_pid_ns(parent_pid_ns);
 
         set_bit(0, ns->pidmap[0].page);
         atomic_set(&ns->pidmap[0].nr_free, BITS_PER_PAGE - 1);
@@ -114,25 +116,11 @@ static void destroy_pid_namespace(struct pid_namespace *ns)
 
 struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *old_ns)
 {
-        struct pid_namespace *new_ns;
-
-        BUG_ON(!old_ns);
-        new_ns = get_pid_ns(old_ns);
         if (!(flags & CLONE_NEWPID))
-                goto out;
-
-        new_ns = ERR_PTR(-EINVAL);
+                return get_pid_ns(old_ns);
         if (flags & CLONE_THREAD)
-                goto out_put;
-
-        new_ns = create_pid_namespace(old_ns->level + 1);
-        if (!IS_ERR(new_ns))
-                new_ns->parent = get_pid_ns(old_ns);
-
-out_put:
-        put_pid_ns(old_ns);
-out:
-        return new_ns;
+                return ERR_PTR(-EINVAL);
+        return create_pid_namespace(old_ns);
 }
 
 void free_pid_ns(struct kref *kref)
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 23bd4daeb96b..72067cbdb37f 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -116,9 +116,13 @@ config SUSPEND_FREEZER
 
           Turning OFF this setting is NOT recommended! If in doubt, say Y.
 
+config HIBERNATION_NVS
+        bool
+
 config HIBERNATION
         bool "Hibernation (aka 'suspend to disk')"
         depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
+        select HIBERNATION_NVS if HAS_IOMEM
         ---help---
           Enable the suspend to disk (STD) functionality, which is usually
           called "hibernation" in user interfaces.  STD checkpoints the
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index 720ea4f781bd..c3b81c30e5d5 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -6,6 +6,9 @@ endif
 obj-$(CONFIG_PM)                += main.o
 obj-$(CONFIG_PM_SLEEP)          += console.o
 obj-$(CONFIG_FREEZER)           += process.o
-obj-$(CONFIG_HIBERNATION)       += swsusp.o disk.o snapshot.o swap.o user.o
+obj-$(CONFIG_SUSPEND)           += suspend.o
+obj-$(CONFIG_PM_TEST_SUSPEND)   += suspend_test.o
+obj-$(CONFIG_HIBERNATION)       += swsusp.o hibernate.o snapshot.o swap.o user.o
+obj-$(CONFIG_HIBERNATION_NVS)   += hibernate_nvs.o
 
 obj-$(CONFIG_MAGIC_SYSRQ)       += poweroff.o
diff --git a/kernel/power/disk.c b/kernel/power/hibernate.c
index e71ca9cd81b2..81d2e7464893 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/hibernate.c
@@ -1,12 +1,12 @@
 /*
- * kernel/power/disk.c - Suspend-to-disk support.
+ * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support.
  *
  * Copyright (c) 2003 Patrick Mochel
  * Copyright (c) 2003 Open Source Development Lab
  * Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
+ * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
  *
  * This file is released under the GPLv2.
- *
  */
 
 #include <linux/suspend.h>
@@ -215,19 +215,17 @@ static int create_image(int platform_mode)
         if (error)
                 return error;
 
-        device_pm_lock();
-
-        /* At this point, device_suspend() has been called, but *not*
-         * device_power_down(). We *must* call device_power_down() now.
+        /* At this point, dpm_suspend_start() has been called, but *not*
+         * dpm_suspend_noirq(). We *must* call dpm_suspend_noirq() now.
          * Otherwise, drivers for some devices (e.g. interrupt controllers)
          * become desynchronized with the actual state of the hardware
          * at resume time, and evil weirdness ensues.
          */
-        error = device_power_down(PMSG_FREEZE);
+        error = dpm_suspend_noirq(PMSG_FREEZE);
         if (error) {
                 printk(KERN_ERR "PM: Some devices failed to power down, "
                         "aborting hibernation\n");
-                goto Unlock;
+                return error;
         }
 
         error = platform_pre_snapshot(platform_mode);
@@ -241,9 +239,9 @@ static int create_image(int platform_mode)
 
         local_irq_disable();
 
-        sysdev_suspend(PMSG_FREEZE);
+        error = sysdev_suspend(PMSG_FREEZE);
         if (error) {
-                printk(KERN_ERR "PM: Some devices failed to power down, "
+                printk(KERN_ERR "PM: Some system devices failed to power down, "
                         "aborting hibernation\n");
                 goto Enable_irqs;
         }
@@ -264,7 +262,7 @@ static int create_image(int platform_mode)
 
  Power_up:
         sysdev_resume();
-        /* NOTE:  device_power_up() is just a resume() for devices
+        /* NOTE:  dpm_resume_noirq() is just a resume() for devices
          * that suspended with irqs off ... no overall powerup.
          */
 
@@ -277,12 +275,9 @@ static int create_image(int platform_mode)
  Platform_finish:
         platform_finish(platform_mode);
 
-        device_power_up(in_suspend ?
+        dpm_resume_noirq(in_suspend ?
                 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
 
- Unlock:
-        device_pm_unlock();
-
         return error;
 }
 
@@ -309,7 +304,7 @@ int hibernation_snapshot(int platform_mode)
                 goto Close;
 
         suspend_console();
-        error = device_suspend(PMSG_FREEZE);
+        error = dpm_suspend_start(PMSG_FREEZE);
         if (error)
                 goto Recover_platform;
 
@@ -320,7 +315,7 @@ int hibernation_snapshot(int platform_mode)
         /* Control returns here after successful restore */
 
  Resume_devices:
-        device_resume(in_suspend ?
+        dpm_resume_end(in_suspend ?
                 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
         resume_console();
  Close:
@@ -344,13 +339,11 @@ static int resume_target_kernel(bool platform_mode)
 {
         int error;
 
-        device_pm_lock();
-
-        error = device_power_down(PMSG_QUIESCE);
+        error = dpm_suspend_noirq(PMSG_QUIESCE);
         if (error) {
                 printk(KERN_ERR "PM: Some devices failed to power down, "
                         "aborting resume\n");
-                goto Unlock;
+                return error;
         }
 
         error = platform_pre_restore(platform_mode);
@@ -401,10 +394,7 @@ static int resume_target_kernel(bool platform_mode)
  Cleanup:
         platform_restore_cleanup(platform_mode);
 
-        device_power_up(PMSG_RECOVER);
-
- Unlock:
-        device_pm_unlock();
+        dpm_resume_noirq(PMSG_RECOVER);
 
         return error;
 }
@@ -424,10 +414,10 @@ int hibernation_restore(int platform_mode)
 
         pm_prepare_console();
         suspend_console();
-        error = device_suspend(PMSG_QUIESCE);
+        error = dpm_suspend_start(PMSG_QUIESCE);
         if (!error) {
                 error = resume_target_kernel(platform_mode);
-                device_resume(PMSG_RECOVER);
+                dpm_resume_end(PMSG_RECOVER);
         }
         resume_console();
         pm_restore_console();
@@ -457,18 +447,16 @@ int hibernation_platform_enter(void)
 
         entering_platform_hibernation = true;
         suspend_console();
-        error = device_suspend(PMSG_HIBERNATE);
+        error = dpm_suspend_start(PMSG_HIBERNATE);
         if (error) {
                 if (hibernation_ops->recover)
                         hibernation_ops->recover();
                 goto Resume_devices;
         }
 
-        device_pm_lock();
-
-        error = device_power_down(PMSG_HIBERNATE);
+        error = dpm_suspend_noirq(PMSG_HIBERNATE);
         if (error)
-                goto Unlock;
+                goto Resume_devices;
 
         error = hibernation_ops->prepare();
         if (error)
@@ -491,14 +479,11 @@ int hibernation_platform_enter(void)
  Platofrm_finish:
         hibernation_ops->finish();
 
-        device_power_up(PMSG_RESTORE);
-
- Unlock:
-        device_pm_unlock();
+        dpm_suspend_noirq(PMSG_RESTORE);
 
  Resume_devices:
         entering_platform_hibernation = false;
-        device_resume(PMSG_RESTORE);
+        dpm_resume_end(PMSG_RESTORE);
         resume_console();
 
  Close:
diff --git a/kernel/power/hibernate_nvs.c b/kernel/power/hibernate_nvs.c
new file mode 100644
index 000000000000..39ac698ef836
--- /dev/null
+++ b/kernel/power/hibernate_nvs.c
@@ -0,0 +1,135 @@
+/*
+ * linux/kernel/power/hibernate_nvs.c - Routines for handling NVS memory
+ *
+ * Copyright (C) 2008,2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/suspend.h>
+
+/*
+ * Platforms, like ACPI, may want us to save some memory used by them during
+ * hibernation and to restore the contents of this memory during the subsequent
+ * resume.  The code below implements a mechanism allowing us to do that.
+ */
+
+struct nvs_page {
+        unsigned long phys_start;
+        unsigned int size;
+        void *kaddr;
+        void *data;
+        struct list_head node;
+};
+
+static LIST_HEAD(nvs_list);
+
+/**
+ *      hibernate_nvs_register - register platform NVS memory region to save
+ *      @start - physical address of the region
+ *      @size - size of the region
+ *
+ *      The NVS region need not be page-aligned (both ends) and we arrange
+ *      things so that the data from page-aligned addresses in this region will
+ *      be copied into separate RAM pages.
+ */
+int hibernate_nvs_register(unsigned long start, unsigned long size)
+{
+        struct nvs_page *entry, *next;
+
+        while (size > 0) {
+                unsigned int nr_bytes;
+
+                entry = kzalloc(sizeof(struct nvs_page), GFP_KERNEL);
+                if (!entry)
+                        goto Error;
+
+                list_add_tail(&entry->node, &nvs_list);
+                entry->phys_start = start;
+                nr_bytes = PAGE_SIZE - (start & ~PAGE_MASK);
+                entry->size = (size < nr_bytes) ? size : nr_bytes;
+
+                start += entry->size;
+                size -= entry->size;
+        }
+        return 0;
+
+ Error:
+        list_for_each_entry_safe(entry, next, &nvs_list, node) {
+                list_del(&entry->node);
+                kfree(entry);
+        }
+        return -ENOMEM;
+}
+
+/**
+ *      hibernate_nvs_free - free data pages allocated for saving NVS regions
+ */
+void hibernate_nvs_free(void)
+{
+        struct nvs_page *entry;
+
+        list_for_each_entry(entry, &nvs_list, node)
+                if (entry->data) {
+                        free_page((unsigned long)entry->data);
+                        entry->data = NULL;
+                        if (entry->kaddr) {
+                                iounmap(entry->kaddr);
+                                entry->kaddr = NULL;
+                        }
+                }
+}
+
+/**
+ *      hibernate_nvs_alloc - allocate memory necessary for saving NVS regions
+ */
+int hibernate_nvs_alloc(void)
+{
+        struct nvs_page *entry;
+
+        list_for_each_entry(entry, &nvs_list, node) {
+                entry->data = (void *)__get_free_page(GFP_KERNEL);
+                if (!entry->data) {
+                        hibernate_nvs_free();
+                        return -ENOMEM;
+                }
+        }
+        return 0;
+}
+
+/**
+ *      hibernate_nvs_save - save NVS memory regions
+ */
+void hibernate_nvs_save(void)
+{
+        struct nvs_page *entry;
+
+        printk(KERN_INFO "PM: Saving platform NVS memory\n");
+
+        list_for_each_entry(entry, &nvs_list, node)
+                if (entry->data) {
+                        entry->kaddr = ioremap(entry->phys_start, entry->size);
+                        memcpy(entry->data, entry->kaddr, entry->size);
+                }
+}
+
+/**
+ *      hibernate_nvs_restore - restore NVS memory regions
+ *
+ *      This function is going to be called with interrupts disabled, so it
+ *      cannot iounmap the virtual addresses used to access the NVS region.
+ */
+void hibernate_nvs_restore(void)
+{
+        struct nvs_page *entry;
+
+        printk(KERN_INFO "PM: Restoring platform NVS memory\n");
+
+        list_for_each_entry(entry, &nvs_list, node)
+                if (entry->data)
+                        memcpy(entry->kaddr, entry->data, entry->size);
+}
diff --git a/kernel/power/main.c b/kernel/power/main.c
index f99ed6a75eac..f710e36930cc 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -8,20 +8,9 @@
  *
  */
 
-#include <linux/module.h>
-#include <linux/suspend.h>
 #include <linux/kobject.h>
 #include <linux/string.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/kmod.h>
-#include <linux/init.h>
-#include <linux/console.h>
-#include <linux/cpu.h>
 #include <linux/resume-trace.h>
-#include <linux/freezer.h>
-#include <linux/vmstat.h>
-#include <linux/syscalls.h>
 
 #include "power.h"
 
@@ -119,378 +108,6 @@ power_attr(pm_test);
 
 #endif /* CONFIG_PM_SLEEP */
 
-#ifdef CONFIG_SUSPEND
-
-static int suspend_test(int level)
-{
-#ifdef CONFIG_PM_DEBUG
-        if (pm_test_level == level) {
-                printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
-                mdelay(5000);
-                return 1;
-        }
-#endif /* !CONFIG_PM_DEBUG */
-        return 0;
-}
-
-#ifdef CONFIG_PM_TEST_SUSPEND
-
-/*
- * We test the system suspend code by setting an RTC wakealarm a short
- * time in the future, then suspending.  Suspending the devices won't
- * normally take long ... some systems only need a few milliseconds.
- *
- * The time it takes is system-specific though, so when we test this
- * during system bootup we allow a LOT of time.
- */
-#define TEST_SUSPEND_SECONDS    5
-
-static unsigned long suspend_test_start_time;
-
-static void suspend_test_start(void)
-{
-        /* FIXME Use better timebase than "jiffies", ideally a clocksource.
-         * What we want is a hardware counter that will work correctly even
-         * during the irqs-are-off stages of the suspend/resume cycle...
-         */
-        suspend_test_start_time = jiffies;
-}
-
-static void suspend_test_finish(const char *label)
-{
-        long nj = jiffies - suspend_test_start_time;
-        unsigned msec;
-
-        msec = jiffies_to_msecs(abs(nj));
-        pr_info("PM: %s took %d.%03d seconds\n", label,
-                        msec / 1000, msec % 1000);
-
-        /* Warning on suspend means the RTC alarm period needs to be
-         * larger -- the system was sooo slooowwww to suspend that the
-         * alarm (should have) fired before the system went to sleep!
-         *
-         * Warning on either suspend or resume also means the system
-         * has some performance issues.  The stack dump of a WARN_ON
-         * is more likely to get the right attention than a printk...
-         */
-        WARN(msec > (TEST_SUSPEND_SECONDS * 1000), "Component: %s\n", label);
-}
-
-#else
-
-static void suspend_test_start(void)
-{
-}
-
-static void suspend_test_finish(const char *label)
-{
-}
-
-#endif
-
-/* This is just an arbitrary number */
-#define FREE_PAGE_NUMBER (100)
-
-static struct platform_suspend_ops *suspend_ops;
-
-/**
- *      suspend_set_ops - Set the global suspend method table.
- *      @ops:   Pointer to ops structure.
- */
-
-void suspend_set_ops(struct platform_suspend_ops *ops)
-{
-        mutex_lock(&pm_mutex);
-        suspend_ops = ops;
-        mutex_unlock(&pm_mutex);
-}
-
-/**
- * suspend_valid_only_mem - generic memory-only valid callback
- *
- * Platform drivers that implement mem suspend only and only need
- * to check for that in their .valid callback can use this instead
- * of rolling their own .valid callback.
- */
-int suspend_valid_only_mem(suspend_state_t state)
-{
-        return state == PM_SUSPEND_MEM;
-}
-
-/**
- *      suspend_prepare - Do prep work before entering low-power state.
- *
- *      This is common code that is called for each state that we're entering.
- *      Run suspend notifiers, allocate a console and stop all processes.
- */
-static int suspend_prepare(void)
-{
-        int error;
-        unsigned int free_pages;
-
-        if (!suspend_ops || !suspend_ops->enter)
-                return -EPERM;
-
-        pm_prepare_console();
-
-        error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
-        if (error)
-                goto Finish;
-
-        error = usermodehelper_disable();
-        if (error)
-                goto Finish;
-
-        if (suspend_freeze_processes()) {
-                error = -EAGAIN;
-                goto Thaw;
-        }
-
-        free_pages = global_page_state(NR_FREE_PAGES);
-        if (free_pages < FREE_PAGE_NUMBER) {
-                pr_debug("PM: free some memory\n");
-                shrink_all_memory(FREE_PAGE_NUMBER - free_pages);
-                if (nr_free_pages() < FREE_PAGE_NUMBER) {
-                        error = -ENOMEM;
-                        printk(KERN_ERR "PM: No enough memory\n");
-                }
-        }
-        if (!error)
-                return 0;
-
- Thaw:
-        suspend_thaw_processes();
-        usermodehelper_enable();
- Finish:
-        pm_notifier_call_chain(PM_POST_SUSPEND);
-        pm_restore_console();
-        return error;
-}
-
-/* default implementation */
-void __attribute__ ((weak)) arch_suspend_disable_irqs(void)
-{
-        local_irq_disable();
-}
-
-/* default implementation */
-void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
-{
-        local_irq_enable();
-}
-
-/**
- *      suspend_enter - enter the desired system sleep state.
- *      @state:         state to enter
- *
- *      This function should be called after devices have been suspended.
- */
-static int suspend_enter(suspend_state_t state)
-{
-        int error;
-
-        device_pm_lock();
-
-        if (suspend_ops->prepare) {
-                error = suspend_ops->prepare();
-                if (error)
-                        goto Done;
-        }
-
-        error = device_power_down(PMSG_SUSPEND);
-        if (error) {
-                printk(KERN_ERR "PM: Some devices failed to power down\n");
-                goto Platfrom_finish;
-        }
-
-        if (suspend_ops->prepare_late) {
-                error = suspend_ops->prepare_late();
-                if (error)
-                        goto Power_up_devices;
-        }
-
-        if (suspend_test(TEST_PLATFORM))
-                goto Platform_wake;
-
-        error = disable_nonboot_cpus();
-        if (error || suspend_test(TEST_CPUS))
-                goto Enable_cpus;
-
-        arch_suspend_disable_irqs();
-        BUG_ON(!irqs_disabled());
-
-        error = sysdev_suspend(PMSG_SUSPEND);
-        if (!error) {
-                if (!suspend_test(TEST_CORE))
-                        error = suspend_ops->enter(state);
-                sysdev_resume();
-        }
-
-        arch_suspend_enable_irqs();
-        BUG_ON(irqs_disabled());
-
- Enable_cpus:
-        enable_nonboot_cpus();
-
- Platform_wake:
-        if (suspend_ops->wake)
-                suspend_ops->wake();
-
- Power_up_devices:
-        device_power_up(PMSG_RESUME);
-
- Platfrom_finish:
-        if (suspend_ops->finish)
-                suspend_ops->finish();
-
- Done:
-        device_pm_unlock();
-
-        return error;
-}
-
-/**
- *      suspend_devices_and_enter - suspend devices and enter the desired system
- *                                  sleep state.
- *      @state:           state to enter
- */
-int suspend_devices_and_enter(suspend_state_t state)
-{
-        int error;
-
-        if (!suspend_ops)
-                return -ENOSYS;
-
-        if (suspend_ops->begin) {
-                error = suspend_ops->begin(state);
-                if (error)
-                        goto Close;
-        }
-        suspend_console();
-        suspend_test_start();
-        error = device_suspend(PMSG_SUSPEND);
-        if (error) {
-                printk(KERN_ERR "PM: Some devices failed to suspend\n");
-                goto Recover_platform;
-        }
-        suspend_test_finish("suspend devices");
-        if (suspend_test(TEST_DEVICES))
-                goto Recover_platform;
-
-        suspend_enter(state);
-
- Resume_devices:
-        suspend_test_start();
-        device_resume(PMSG_RESUME);
-        suspend_test_finish("resume devices");
-        resume_console();
- Close:
-        if (suspend_ops->end)
-                suspend_ops->end();
-        return error;
-
- Recover_platform:
-        if (suspend_ops->recover)
-                suspend_ops->recover();
-        goto Resume_devices;
-}
-
-/**
- *      suspend_finish - Do final work before exiting suspend sequence.
- *
- *      Call platform code to clean up, restart processes, and free the 
- *      console that we've allocated. This is not called for suspend-to-disk.
- */
-static void suspend_finish(void)
-{
-        suspend_thaw_processes();
-        usermodehelper_enable();
-        pm_notifier_call_chain(PM_POST_SUSPEND);
-        pm_restore_console();
-}
-
-
-
-
-static const char * const pm_states[PM_SUSPEND_MAX] = {
-        [PM_SUSPEND_STANDBY]    = "standby",
-        [PM_SUSPEND_MEM]        = "mem",
-};
-
-static inline int valid_state(suspend_state_t state)
-{
-        /* All states need lowlevel support and need to be valid
-         * to the lowlevel implementation, no valid callback
-         * implies that none are valid. */
-        if (!suspend_ops || !suspend_ops->valid || !suspend_ops->valid(state))
-                return 0;
-        return 1;
-}
-
-
-/**
- *      enter_state - Do common work of entering low-power state.
- *      @state:         pm_state structure for state we're entering.
- *
- *      Make sure we're the only ones trying to enter a sleep state. Fail
- *      if someone has beat us to it, since we don't want anything weird to
- *      happen when we wake up.
- *      Then, do the setup for suspend, enter the state, and cleaup (after
- *      we've woken up).
- */
-static int enter_state(suspend_state_t state)
-{
-        int error;
-
-        if (!valid_state(state))
-                return -ENODEV;
-
-        if (!mutex_trylock(&pm_mutex))
-                return -EBUSY;
-
-        printk(KERN_INFO "PM: Syncing filesystems ... ");
-        sys_sync();
-        printk("done.\n");
-
-        pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
-        error = suspend_prepare();
-        if (error)
-                goto Unlock;
-
-        if (suspend_test(TEST_FREEZER))
-                goto Finish;
-
-        pr_debug("PM: Entering %s sleep\n", pm_states[state]);
-        error = suspend_devices_and_enter(state);
-
- Finish:
-        pr_debug("PM: Finishing wakeup.\n");
-        suspend_finish();
- Unlock:
-        mutex_unlock(&pm_mutex);
-        return error;
-}
-
-
-/**
- *      pm_suspend - Externally visible function for suspending system.
- *      @state:         Enumerated value of state to enter.
- *
- *      Determine whether or not value is within range, get state 
- *      structure, and enter (above).
- */
-
-int pm_suspend(suspend_state_t state)
-{
-        if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX)
-                return enter_state(state);
-        return -EINVAL;
-}
-
-EXPORT_SYMBOL(pm_suspend);
-
-#endif /* CONFIG_SUSPEND */
-
 struct kobject *power_kobj;
 
 /**
@@ -503,7 +120,6 @@ struct kobject *power_kobj;
  *      store() accepts one of those strings, translates it into the 
  *      proper enumerated value, and initiates a suspend transition.
  */
-
 static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
                           char *buf)
 {
@@ -601,7 +217,6 @@ static struct attribute_group attr_group = {
         .attrs = g,
 };
 
-
 static int __init pm_init(void)
 {
         power_kobj = kobject_create_and_add("power", NULL);
@@ -611,144 +226,3 @@ static int __init pm_init(void)
 }
 
 core_initcall(pm_init);
-
-
-#ifdef CONFIG_PM_TEST_SUSPEND
-
-#include <linux/rtc.h>
-
-/*
- * To test system suspend, we need a hands-off mechanism to resume the
- * system.  RTCs wake alarms are a common self-contained mechanism.
- */
-
-static void __init test_wakealarm(struct rtc_device *rtc, suspend_state_t state)
-{
-        static char err_readtime[] __initdata =
-                KERN_ERR "PM: can't read %s time, err %d\n";
-        static char err_wakealarm [] __initdata =
-                KERN_ERR "PM: can't set %s wakealarm, err %d\n";
-        static char err_suspend[] __initdata =
-                KERN_ERR "PM: suspend test failed, error %d\n";
-        static char info_test[] __initdata =
-                KERN_INFO "PM: test RTC wakeup from '%s' suspend\n";
-
-        unsigned long           now;
-        struct rtc_wkalrm       alm;
-        int                     status;
-
-        /* this may fail if the RTC hasn't been initialized */
-        status = rtc_read_time(rtc, &alm.time);
-        if (status < 0) {
-                printk(err_readtime, dev_name(&rtc->dev), status);
-                return;
-        }
-        rtc_tm_to_time(&alm.time, &now);
-
-        memset(&alm, 0, sizeof alm);
-        rtc_time_to_tm(now + TEST_SUSPEND_SECONDS, &alm.time);
-        alm.enabled = true;
-
-        status = rtc_set_alarm(rtc, &alm);
-        if (status < 0) {
-                printk(err_wakealarm, dev_name(&rtc->dev), status);
-                return;
-        }
-
-        if (state == PM_SUSPEND_MEM) {
-                printk(info_test, pm_states[state]);
-                status = pm_suspend(state);
-                if (status == -ENODEV)
-                        state = PM_SUSPEND_STANDBY;
-        }
-        if (state == PM_SUSPEND_STANDBY) {
-                printk(info_test, pm_states[state]);
-                status = pm_suspend(state);
-        }
-        if (status < 0)
-                printk(err_suspend, status);
-
-        /* Some platforms can't detect that the alarm triggered the
-         * wakeup, or (accordingly) disable it after it afterwards.
-         * It's supposed to give oneshot behavior; cope.
-         */
-        alm.enabled = false;
-        rtc_set_alarm(rtc, &alm);
-}
-
-static int __init has_wakealarm(struct device *dev, void *name_ptr)
-{
-        struct rtc_device *candidate = to_rtc_device(dev);
-
-        if (!candidate->ops->set_alarm)
-                return 0;
-        if (!device_may_wakeup(candidate->dev.parent))
-                return 0;
-
-        *(const char **)name_ptr = dev_name(dev);
-        return 1;
-}
-
-/*
- * Kernel options like "test_suspend=mem" force suspend/resume sanity tests
- * at startup time.  They're normally disabled, for faster boot and because
- * we can't know which states really work on this particular system.
- */
-static suspend_state_t test_state __initdata = PM_SUSPEND_ON;
-
-static char warn_bad_state[] __initdata =
-        KERN_WARNING "PM: can't test '%s' suspend state\n";
-
-static int __init setup_test_suspend(char *value)
-{
-        unsigned i;
-
-        /* "=mem" ==> "mem" */
-        value++;
-        for (i = 0; i < PM_SUSPEND_MAX; i++) {
-                if (!pm_states[i])
-                        continue;
-                if (strcmp(pm_states[i], value) != 0)
-                        continue;
-                test_state = (__force suspend_state_t) i;
-                return 0;
-        }
-        printk(warn_bad_state, value);
-        return 0;
-}
-__setup("test_suspend", setup_test_suspend);
-
-static int __init test_suspend(void)
-{
-        static char             warn_no_rtc[] __initdata =
-                KERN_WARNING "PM: no wakealarm-capable RTC driver is ready\n";
-
-        char                    *pony = NULL;
-        struct rtc_device       *rtc = NULL;
-
-        /* PM is initialized by now; is that state testable? */
-        if (test_state == PM_SUSPEND_ON)
-                goto done;
-        if (!valid_state(test_state)) {
-                printk(warn_bad_state, pm_states[test_state]);
-                goto done;
-        }
-
-        /* RTCs have initialized by now too ... can we use one? */
-        class_find_device(rtc_class, NULL, &pony, has_wakealarm);
-        if (pony)
-                rtc = rtc_class_open(pony);
-        if (!rtc) {
-                printk(warn_no_rtc);
-                goto done;
-        }
-
-        /* go for it */
-        test_wakealarm(rtc, test_state);
-        rtc_class_close(rtc);
-done:
-        return 0;
-}
-late_initcall(test_suspend);
-
-#endif /* CONFIG_PM_TEST_SUSPEND */
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 46b5ec7a3afb..26d5a26f82e3 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -45,7 +45,7 @@ static inline char *check_image_kernel(struct swsusp_info *info)
  */
 #define SPARE_PAGES     ((1024 * 1024) >> PAGE_SHIFT)
 
-/* kernel/power/disk.c */
+/* kernel/power/hibernate.c */
 extern int hibernation_snapshot(int platform_mode);
 extern int hibernation_restore(int platform_mode);
 extern int hibernation_platform_enter(void);
@@ -74,7 +74,7 @@ extern asmlinkage int swsusp_arch_resume(void);
 
 extern int create_basic_memory_bitmaps(void);
 extern void free_basic_memory_bitmaps(void);
-extern unsigned int count_data_pages(void);
+extern int swsusp_shrink_memory(void);
 
 /**
  *      Auxiliary structure used for reading the snapshot image data and
@@ -147,9 +147,8 @@ extern int swsusp_swap_in_use(void);
  */
 #define SF_PLATFORM_MODE        1
 
-/* kernel/power/disk.c */
+/* kernel/power/hibernate.c */
 extern int swsusp_check(void);
-extern int swsusp_shrink_memory(void);
 extern void swsusp_free(void);
 extern int swsusp_read(unsigned int *flags_p);
 extern int swsusp_write(unsigned int flags);
@@ -161,22 +160,36 @@ extern void swsusp_show_speed(struct timeval *, struct timeval *,
                                 unsigned int, char *);
 
 #ifdef CONFIG_SUSPEND
-/* kernel/power/main.c */
+/* kernel/power/suspend.c */
+extern const char *const pm_states[];
+
+extern bool valid_state(suspend_state_t state);
 extern int suspend_devices_and_enter(suspend_state_t state);
+extern int enter_state(suspend_state_t state);
 #else /* !CONFIG_SUSPEND */
 static inline int suspend_devices_and_enter(suspend_state_t state)
 {
         return -ENOSYS;
 }
+static inline int enter_state(suspend_state_t state) { return -ENOSYS; }
+static inline bool valid_state(suspend_state_t state) { return false; }
 #endif /* !CONFIG_SUSPEND */
 
+#ifdef CONFIG_PM_TEST_SUSPEND
+/* kernel/power/suspend_test.c */
+extern void suspend_test_start(void);
+extern void suspend_test_finish(const char *label);
+#else /* !CONFIG_PM_TEST_SUSPEND */
+static inline void suspend_test_start(void) {}
+static inline void suspend_test_finish(const char *label) {}
+#endif /* !CONFIG_PM_TEST_SUSPEND */
+
 #ifdef CONFIG_PM_SLEEP
 /* kernel/power/main.c */
 extern int pm_notifier_call_chain(unsigned long val);
 #endif
 
 #ifdef CONFIG_HIGHMEM
-unsigned int count_highmem_pages(void);
 int restore_highmem(void);
 #else
 static inline unsigned int count_highmem_pages(void) { return 0; }
diff --git a/kernel/power/poweroff.c b/kernel/power/poweroff.c
index 97890831e1b5..e8b337006276 100644
--- a/kernel/power/poweroff.c
+++ b/kernel/power/poweroff.c
@@ -34,7 +34,7 @@ static struct sysrq_key_op	sysrq_poweroff_op = {
         .handler        = handle_poweroff,
         .help_msg       = "powerOff",
         .action_msg     = "Power Off",
-        .enable_mask    = SYSRQ_ENABLE_BOOT,
+        .enable_mask    = SYSRQ_ENABLE_BOOT,
 };
 
 static int pm_sysrq_init(void)
diff --git a/kernel/power/process.c b/kernel/power/process.c
index ca634019497a..da2072d73811 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -117,9 +117,12 @@ int freeze_processes(void)
         if (error)
                 goto Exit;
         printk("done.");
+
+        oom_killer_disable();
  Exit:
         BUG_ON(in_atomic());
         printk("\n");
+
         return error;
 }
 
@@ -145,6 +148,8 @@ static void thaw_tasks(bool nosig_only)
 
 void thaw_processes(void)
 {
+        oom_killer_enable();
+
         printk("Restarting tasks ... ");
         thaw_tasks(true);
         thaw_tasks(false);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 33e2e4a819f9..523a451b45d3 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -39,6 +39,14 @@ static int swsusp_page_is_free(struct page *);
 static void swsusp_set_page_forbidden(struct page *);
 static void swsusp_unset_page_forbidden(struct page *);
 
+/*
+ * Preferred image size in bytes (tunable via /sys/power/image_size).
+ * When it is set to N, swsusp will do its best to ensure the image
+ * size will not exceed N bytes, but if that is impossible, it will
+ * try to create the smallest image possible.
+ */
+unsigned long image_size = 500 * 1024 * 1024;
+
 /* List of PBEs needed for restoring the pages that were allocated before
  * the suspend and included in the suspend image, but have also been
  * allocated by the "resume" kernel, so their contents cannot be written
@@ -840,7 +848,7 @@ static struct page *saveable_highmem_page(struct zone *zone, unsigned long pfn)
  *      pages.
  */
 
-unsigned int count_highmem_pages(void)
+static unsigned int count_highmem_pages(void)
 {
         struct zone *zone;
         unsigned int n = 0;
@@ -902,7 +910,7 @@ static struct page *saveable_page(struct zone *zone, unsigned long pfn)
  *      pages.
  */
 
-unsigned int count_data_pages(void)
+static unsigned int count_data_pages(void)
 {
         struct zone *zone;
         unsigned long pfn, max_zone_pfn;
@@ -1058,6 +1066,74 @@ void swsusp_free(void)
         buffer = NULL;
 }
 
+/**
+ *      swsusp_shrink_memory -  Try to free as much memory as needed
+ *
+ *      ... but do not OOM-kill anyone
+ *
+ *      Notice: all userland should be stopped before it is called, or
+ *      livelock is possible.
+ */
+
+#define SHRINK_BITE     10000
+static inline unsigned long __shrink_memory(long tmp)
+{
+        if (tmp > SHRINK_BITE)
+                tmp = SHRINK_BITE;
+        return shrink_all_memory(tmp);
+}
+
+int swsusp_shrink_memory(void)
+{
+        long tmp;
+        struct zone *zone;
+        unsigned long pages = 0;
+        unsigned int i = 0;
+        char *p = "-\\|/";
+        struct timeval start, stop;
+
+        printk(KERN_INFO "PM: Shrinking memory...  ");
+        do_gettimeofday(&start);
+        do {
+                long size, highmem_size;
+
+                highmem_size = count_highmem_pages();
+                size = count_data_pages() + PAGES_FOR_IO + SPARE_PAGES;
+                tmp = size;
+                size += highmem_size;
+                for_each_populated_zone(zone) {
+                        tmp += snapshot_additional_pages(zone);
+                        if (is_highmem(zone)) {
+                                highmem_size -=
+                                        zone_page_state(zone, NR_FREE_PAGES);
+                        } else {
+                                tmp -= zone_page_state(zone, NR_FREE_PAGES);
+                                tmp += zone->lowmem_reserve[ZONE_NORMAL];
+                        }
+                }
+
+                if (highmem_size < 0)
+                        highmem_size = 0;
+
+                tmp += highmem_size;
+                if (tmp > 0) {
+                        tmp = __shrink_memory(tmp);
+                        if (!tmp)
+                                return -ENOMEM;
+                        pages += tmp;
+                } else if (size > image_size / PAGE_SIZE) {
+                        tmp = __shrink_memory(size - (image_size / PAGE_SIZE));
+                        pages += tmp;
+                }
+                printk("\b%c", p[i++%4]);
+        } while (tmp > 0);
+        do_gettimeofday(&stop);
+        printk("\bdone (%lu pages freed)\n", pages);
+        swsusp_show_speed(&start, &stop, pages, "Freed");
+
+        return 0;
+}
+
 #ifdef CONFIG_HIGHMEM
 /**
   *     count_pages_for_highmem - compute the number of non-highmem pages
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
new file mode 100644
index 000000000000..6f10dfc2d3e9
--- /dev/null
+++ b/kernel/power/suspend.c
@@ -0,0 +1,300 @@
+/*
+ * kernel/power/suspend.c - Suspend to RAM and standby functionality.
+ *
+ * Copyright (c) 2003 Patrick Mochel
+ * Copyright (c) 2003 Open Source Development Lab
+ * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/cpu.h>
+#include <linux/syscalls.h>
+
+#include "power.h"
+
+const char *const pm_states[PM_SUSPEND_MAX] = {
+        [PM_SUSPEND_STANDBY]    = "standby",
+        [PM_SUSPEND_MEM]        = "mem",
+};
+
+static struct platform_suspend_ops *suspend_ops;
+
+/**
+ *      suspend_set_ops - Set the global suspend method table.
+ *      @ops:   Pointer to ops structure.
+ */
+void suspend_set_ops(struct platform_suspend_ops *ops)
+{
+        mutex_lock(&pm_mutex);
+        suspend_ops = ops;
+        mutex_unlock(&pm_mutex);
+}
+
+bool valid_state(suspend_state_t state)
+{
+        /*
+         * All states need lowlevel support and need to be valid to the lowlevel
+         * implementation, no valid callback implies that none are valid.
+         */
+        return suspend_ops && suspend_ops->valid && suspend_ops->valid(state);
+}
+
+/**
+ * suspend_valid_only_mem - generic memory-only valid callback
+ *
+ * Platform drivers that implement mem suspend only and only need
+ * to check for that in their .valid callback can use this instead
+ * of rolling their own .valid callback.
+ */
+int suspend_valid_only_mem(suspend_state_t state)
+{
+        return state == PM_SUSPEND_MEM;
+}
+
+static int suspend_test(int level)
+{
+#ifdef CONFIG_PM_DEBUG
+        if (pm_test_level == level) {
+                printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
+                mdelay(5000);
+                return 1;
+        }
+#endif /* !CONFIG_PM_DEBUG */
+        return 0;
+}
+
+/**
+ *      suspend_prepare - Do prep work before entering low-power state.
+ *
+ *      This is common code that is called for each state that we're entering.
+ *      Run suspend notifiers, allocate a console and stop all processes.
+ */
+static int suspend_prepare(void)
+{
+        int error;
+
+        if (!suspend_ops || !suspend_ops->enter)
+                return -EPERM;
+
+        pm_prepare_console();
+
+        error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
+        if (error)
+                goto Finish;
+
+        error = usermodehelper_disable();
+        if (error)
+                goto Finish;
+
+        error = suspend_freeze_processes();
+        if (!error)
+                return 0;
+
+        suspend_thaw_processes();
+        usermodehelper_enable();
+ Finish:
+        pm_notifier_call_chain(PM_POST_SUSPEND);
+        pm_restore_console();
+        return error;
+}
+
+/* default implementation */
+void __attribute__ ((weak)) arch_suspend_disable_irqs(void)
+{
+        local_irq_disable();
+}
+
+/* default implementation */
+void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
+{
+        local_irq_enable();
+}
+
+/**
+ *      suspend_enter - enter the desired system sleep state.
+ *      @state:         state to enter
+ *
+ *      This function should be called after devices have been suspended.
+ */
+static int suspend_enter(suspend_state_t state)
+{
+        int error;
+
+        if (suspend_ops->prepare) {
+                error = suspend_ops->prepare();
+                if (error)
+                        return error;
+        }
+
+        error = dpm_suspend_noirq(PMSG_SUSPEND);
+        if (error) {
+                printk(KERN_ERR "PM: Some devices failed to power down\n");
+                goto Platfrom_finish;
+        }
+
+        if (suspend_ops->prepare_late) {
+                error = suspend_ops->prepare_late();
+                if (error)
+                        goto Power_up_devices;
+        }
+
+        if (suspend_test(TEST_PLATFORM))
+                goto Platform_wake;
+
+        error = disable_nonboot_cpus();
+        if (error || suspend_test(TEST_CPUS))
+                goto Enable_cpus;
+
+        arch_suspend_disable_irqs();
+        BUG_ON(!irqs_disabled());
+
+        error = sysdev_suspend(PMSG_SUSPEND);
+        if (!error) {
+                if (!suspend_test(TEST_CORE))
+                        error = suspend_ops->enter(state);
+                sysdev_resume();
+        }
+
+        arch_suspend_enable_irqs();
+        BUG_ON(irqs_disabled());
+
+ Enable_cpus:
+        enable_nonboot_cpus();
+
+ Platform_wake:
+        if (suspend_ops->wake)
+                suspend_ops->wake();
+
+ Power_up_devices:
+        dpm_resume_noirq(PMSG_RESUME);
+
+ Platfrom_finish:
+        if (suspend_ops->finish)
+                suspend_ops->finish();
+
+        return error;
+}
+
+/**
+ *      suspend_devices_and_enter - suspend devices and enter the desired system
+ *                                  sleep state.
+ *      @state:           state to enter
+ */
+int suspend_devices_and_enter(suspend_state_t state)
+{
+        int error;
+
+        if (!suspend_ops)
+                return -ENOSYS;
+
+        if (suspend_ops->begin) {
+                error = suspend_ops->begin(state);
+                if (error)
+                        goto Close;
+        }
+        suspend_console();
+        suspend_test_start();
+        error = dpm_suspend_start(PMSG_SUSPEND);
+        if (error) {
+                printk(KERN_ERR "PM: Some devices failed to suspend\n");
+                goto Recover_platform;
+        }
+        suspend_test_finish("suspend devices");
+        if (suspend_test(TEST_DEVICES))
+                goto Recover_platform;
+
+        suspend_enter(state);
+
+ Resume_devices:
+        suspend_test_start();
+        dpm_resume_end(PMSG_RESUME);
+        suspend_test_finish("resume devices");
+        resume_console();
+ Close:
+        if (suspend_ops->end)
+                suspend_ops->end();
+        return error;
+
+ Recover_platform:
+        if (suspend_ops->recover)
+                suspend_ops->recover();
+        goto Resume_devices;
+}
+
+/**
+ *      suspend_finish - Do final work before exiting suspend sequence.
+ *
+ *      Call platform code to clean up, restart processes, and free the
+ *      console that we've allocated. This is not called for suspend-to-disk.
+ */
+static void suspend_finish(void)
+{
+        suspend_thaw_processes();
+        usermodehelper_enable();
+        pm_notifier_call_chain(PM_POST_SUSPEND);
+        pm_restore_console();
+}
+
+/**
+ *      enter_state - Do common work of entering low-power state.
+ *      @state:         pm_state structure for state we're entering.
+ *
+ *      Make sure we're the only ones trying to enter a sleep state. Fail
+ *      if someone has beat us to it, since we don't want anything weird to
+ *      happen when we wake up.
+ *      Then, do the setup for suspend, enter the state, and cleaup (after
+ *      we've woken up).
+ */
+int enter_state(suspend_state_t state)
+{
+        int error;
+
+        if (!valid_state(state))
+                return -ENODEV;
+
+        if (!mutex_trylock(&pm_mutex))
+                return -EBUSY;
+
+        printk(KERN_INFO "PM: Syncing filesystems ... ");
+        sys_sync();
+        printk("done.\n");
+
+        pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
+        error = suspend_prepare();
+        if (error)
+                goto Unlock;
+
+        if (suspend_test(TEST_FREEZER))
+                goto Finish;
+
+        pr_debug("PM: Entering %s sleep\n", pm_states[state]);
+        error = suspend_devices_and_enter(state);
+
+ Finish:
+        pr_debug("PM: Finishing wakeup.\n");
+        suspend_finish();
+ Unlock:
+        mutex_unlock(&pm_mutex);
+        return error;
+}
+
+/**
+ *      pm_suspend - Externally visible function for suspending system.
+ *      @state:         Enumerated value of state to enter.
+ *
+ *      Determine whether or not value is within range, get state
+ *      structure, and enter (above).
+ */
+int pm_suspend(suspend_state_t state)
+{
+        if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX)
+                return enter_state(state);
+        return -EINVAL;
+}
+EXPORT_SYMBOL(pm_suspend);
diff --git a/kernel/power/suspend_test.c b/kernel/power/suspend_test.c
new file mode 100644
index 000000000000..17d8bb1acf9c
--- /dev/null
+++ b/kernel/power/suspend_test.c
@@ -0,0 +1,187 @@
+/*
+ * kernel/power/suspend_test.c - Suspend to RAM and standby test facility.
+ *
+ * Copyright (c) 2009 Pavel Machek <pavel@ucw.cz>
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/init.h>
+#include <linux/rtc.h>
+
+#include "power.h"
+
+/*
+ * We test the system suspend code by setting an RTC wakealarm a short
+ * time in the future, then suspending.  Suspending the devices won't
+ * normally take long ... some systems only need a few milliseconds.
+ *
+ * The time it takes is system-specific though, so when we test this
+ * during system bootup we allow a LOT of time.
+ */
+#define TEST_SUSPEND_SECONDS    5
+
+static unsigned long suspend_test_start_time;
+
+void suspend_test_start(void)
+{
+        /* FIXME Use better timebase than "jiffies", ideally a clocksource.
+         * What we want is a hardware counter that will work correctly even
+         * during the irqs-are-off stages of the suspend/resume cycle...
+         */
+        suspend_test_start_time = jiffies;
+}
+
+void suspend_test_finish(const char *label)
+{
+        long nj = jiffies - suspend_test_start_time;
+        unsigned msec;
+
+        msec = jiffies_to_msecs(abs(nj));
+        pr_info("PM: %s took %d.%03d seconds\n", label,
+                        msec / 1000, msec % 1000);
+
+        /* Warning on suspend means the RTC alarm period needs to be
+         * larger -- the system was sooo slooowwww to suspend that the
+         * alarm (should have) fired before the system went to sleep!
+         *
+         * Warning on either suspend or resume also means the system
+         * has some performance issues.  The stack dump of a WARN_ON
+         * is more likely to get the right attention than a printk...
+         */
+        WARN(msec > (TEST_SUSPEND_SECONDS * 1000), "Component: %s\n", label);
+}
+
+/*
+ * To test system suspend, we need a hands-off mechanism to resume the
+ * system.  RTCs wake alarms are a common self-contained mechanism.
+ */
+
+static void __init test_wakealarm(struct rtc_device *rtc, suspend_state_t state)
+{
+        static char err_readtime[] __initdata =
+                KERN_ERR "PM: can't read %s time, err %d\n";
+        static char err_wakealarm [] __initdata =
+                KERN_ERR "PM: can't set %s wakealarm, err %d\n";
+        static char err_suspend[] __initdata =
+                KERN_ERR "PM: suspend test failed, error %d\n";
+        static char info_test[] __initdata =
+                KERN_INFO "PM: test RTC wakeup from '%s' suspend\n";
+
+        unsigned long           now;
+        struct rtc_wkalrm       alm;
+        int                     status;
+
+        /* this may fail if the RTC hasn't been initialized */
+        status = rtc_read_time(rtc, &alm.time);
+        if (status < 0) {
+                printk(err_readtime, dev_name(&rtc->dev), status);
+                return;
+        }
+        rtc_tm_to_time(&alm.time, &now);
+
+        memset(&alm, 0, sizeof alm);
+        rtc_time_to_tm(now + TEST_SUSPEND_SECONDS, &alm.time);
+        alm.enabled = true;
+
+        status = rtc_set_alarm(rtc, &alm);
+        if (status < 0) {
+                printk(err_wakealarm, dev_name(&rtc->dev), status);
+                return;
+        }
+
+        if (state == PM_SUSPEND_MEM) {
+                printk(info_test, pm_states[state]);
+                status = pm_suspend(state);
+                if (status == -ENODEV)
+                        state = PM_SUSPEND_STANDBY;
+        }
+        if (state == PM_SUSPEND_STANDBY) {
+                printk(info_test, pm_states[state]);
+                status = pm_suspend(state);
+        }
+        if (status < 0)
+                printk(err_suspend, status);
+
+        /* Some platforms can't detect that the alarm triggered the
+         * wakeup, or (accordingly) disable it after it afterwards.
+         * It's supposed to give oneshot behavior; cope.
+         */
+        alm.enabled = false;
+        rtc_set_alarm(rtc, &alm);
+}
+
+static int __init has_wakealarm(struct device *dev, void *name_ptr)
+{
+        struct rtc_device *candidate = to_rtc_device(dev);
+
+        if (!candidate->ops->set_alarm)
+                return 0;
+        if (!device_may_wakeup(candidate->dev.parent))
+                return 0;
+
+        *(const char **)name_ptr = dev_name(dev);
+        return 1;
+}
+
+/*
+ * Kernel options like "test_suspend=mem" force suspend/resume sanity tests
+ * at startup time.  They're normally disabled, for faster boot and because
+ * we can't know which states really work on this particular system.
+ */
+static suspend_state_t test_state __initdata = PM_SUSPEND_ON;
+
+static char warn_bad_state[] __initdata =
+        KERN_WARNING "PM: can't test '%s' suspend state\n";
+
+static int __init setup_test_suspend(char *value)
+{
+        unsigned i;
+
+        /* "=mem" ==> "mem" */
+        value++;
+        for (i = 0; i < PM_SUSPEND_MAX; i++) {
+                if (!pm_states[i])
+                        continue;
+                if (strcmp(pm_states[i], value) != 0)
+                        continue;
+                test_state = (__force suspend_state_t) i;
+                return 0;
+        }
+        printk(warn_bad_state, value);
+        return 0;
+}
+__setup("test_suspend", setup_test_suspend);
+
+static int __init test_suspend(void)
+{
+        static char             warn_no_rtc[] __initdata =
+                KERN_WARNING "PM: no wakealarm-capable RTC driver is ready\n";
+
+        char                    *pony = NULL;
+        struct rtc_device       *rtc = NULL;
+
+        /* PM is initialized by now; is that state testable? */
+        if (test_state == PM_SUSPEND_ON)
+                goto done;
+        if (!valid_state(test_state)) {
+                printk(warn_bad_state, pm_states[test_state]);
+                goto done;
+        }
+
+        /* RTCs have initialized by now too ... can we use one? */
+        class_find_device(rtc_class, NULL, &pony, has_wakealarm);
+        if (pony)
+                rtc = rtc_class_open(pony);
+        if (!rtc) {
+                printk(warn_no_rtc);
+                goto done;
+        }
+
+        /* go for it */
+        test_wakealarm(rtc, test_state);
+        rtc_class_close(rtc);
+done:
+        return 0;
+}
+late_initcall(test_suspend);
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index 78c35047586d..6a07f4dbf2f8 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -55,14 +55,6 @@
 
 #include "power.h"
 
-/*
- * Preferred image size in bytes (tunable via /sys/power/image_size).
- * When it is set to N, swsusp will do its best to ensure the image
- * size will not exceed N bytes, but if that is impossible, it will
- * try to create the smallest image possible.
- */
-unsigned long image_size = 500 * 1024 * 1024;
-
 int in_suspend __nosavedata = 0;
 
 /**
@@ -194,193 +186,3 @@ void swsusp_show_speed(struct timeval *start, struct timeval *stop,
                         centisecs / 100, centisecs % 100,
                         kps / 1000, (kps % 1000) / 10);
 }
-
-/**
- *      swsusp_shrink_memory -  Try to free as much memory as needed
- *
- *      ... but do not OOM-kill anyone
- *
- *      Notice: all userland should be stopped before it is called, or
- *      livelock is possible.
- */
-
-#define SHRINK_BITE     10000
-static inline unsigned long __shrink_memory(long tmp)
-{
-        if (tmp > SHRINK_BITE)
-                tmp = SHRINK_BITE;
-        return shrink_all_memory(tmp);
-}
-
-int swsusp_shrink_memory(void)
-{
-        long tmp;
-        struct zone *zone;
-        unsigned long pages = 0;
-        unsigned int i = 0;
-        char *p = "-\\|/";
-        struct timeval start, stop;
-
-        printk(KERN_INFO "PM: Shrinking memory...  ");
-        do_gettimeofday(&start);
-        do {
-                long size, highmem_size;
-
-                highmem_size = count_highmem_pages();
-                size = count_data_pages() + PAGES_FOR_IO + SPARE_PAGES;
-                tmp = size;
-                size += highmem_size;
-                for_each_populated_zone(zone) {
-                        tmp += snapshot_additional_pages(zone);
-                        if (is_highmem(zone)) {
-                                highmem_size -=
-                                        zone_page_state(zone, NR_FREE_PAGES);
-                        } else {
-                                tmp -= zone_page_state(zone, NR_FREE_PAGES);
-                                tmp += zone->lowmem_reserve[ZONE_NORMAL];
-                        }
-                }
-
-                if (highmem_size < 0)
-                        highmem_size = 0;
-
-                tmp += highmem_size;
-                if (tmp > 0) {
-                        tmp = __shrink_memory(tmp);
-                        if (!tmp)
-                                return -ENOMEM;
-                        pages += tmp;
-                } else if (size > image_size / PAGE_SIZE) {
-                        tmp = __shrink_memory(size - (image_size / PAGE_SIZE));
-                        pages += tmp;
-                }
-                printk("\b%c", p[i++%4]);
-        } while (tmp > 0);
-        do_gettimeofday(&stop);
-        printk("\bdone (%lu pages freed)\n", pages);
-        swsusp_show_speed(&start, &stop, pages, "Freed");
-
-        return 0;
-}
-
-/*
- * Platforms, like ACPI, may want us to save some memory used by them during
- * hibernation and to restore the contents of this memory during the subsequent
- * resume.  The code below implements a mechanism allowing us to do that.
- */
-
-struct nvs_page {
-        unsigned long phys_start;
-        unsigned int size;
-        void *kaddr;
-        void *data;
-        struct list_head node;
-};
-
-static LIST_HEAD(nvs_list);
-
-/**
- *      hibernate_nvs_register - register platform NVS memory region to save
- *      @start - physical address of the region
- *      @size - size of the region
- *
- *      The NVS region need not be page-aligned (both ends) and we arrange
- *      things so that the data from page-aligned addresses in this region will
- *      be copied into separate RAM pages.
- */
-int hibernate_nvs_register(unsigned long start, unsigned long size)
-{
-        struct nvs_page *entry, *next;
-
-        while (size > 0) {
-                unsigned int nr_bytes;
-
-                entry = kzalloc(sizeof(struct nvs_page), GFP_KERNEL);
-                if (!entry)
-                        goto Error;
-
-                list_add_tail(&entry->node, &nvs_list);
-                entry->phys_start = start;
-                nr_bytes = PAGE_SIZE - (start & ~PAGE_MASK);
-                entry->size = (size < nr_bytes) ? size : nr_bytes;
-
-                start += entry->size;
-                size -= entry->size;
-        }
-        return 0;
-
- Error:
-        list_for_each_entry_safe(entry, next, &nvs_list, node) {
-                list_del(&entry->node);
-                kfree(entry);
-        }
-        return -ENOMEM;
-}
-
-/**
- *      hibernate_nvs_free - free data pages allocated for saving NVS regions
- */
-void hibernate_nvs_free(void)
-{
-        struct nvs_page *entry;
-
-        list_for_each_entry(entry, &nvs_list, node)
-                if (entry->data) {
-                        free_page((unsigned long)entry->data);
-                        entry->data = NULL;
-                        if (entry->kaddr) {
-                                iounmap(entry->kaddr);
-                                entry->kaddr = NULL;
-                        }
-                }
-}
-
-/**
- *      hibernate_nvs_alloc - allocate memory necessary for saving NVS regions
- */
-int hibernate_nvs_alloc(void)
-{
-        struct nvs_page *entry;
-
-        list_for_each_entry(entry, &nvs_list, node) {
-                entry->data = (void *)__get_free_page(GFP_KERNEL);
-                if (!entry->data) {
-                        hibernate_nvs_free();
-                        return -ENOMEM;
-                }
-        }
-        return 0;
-}
-
-/**
- *      hibernate_nvs_save - save NVS memory regions
- */
-void hibernate_nvs_save(void)
-{
-        struct nvs_page *entry;
-
-        printk(KERN_INFO "PM: Saving platform NVS memory\n");
-
-        list_for_each_entry(entry, &nvs_list, node)
-                if (entry->data) {
-                        entry->kaddr = ioremap(entry->phys_start, entry->size);
-                        memcpy(entry->data, entry->kaddr, entry->size);
-                }
-}
-
-/**
- *      hibernate_nvs_restore - restore NVS memory regions
- *
- *      This function is going to be called with interrupts disabled, so it
- *      cannot iounmap the virtual addresses used to access the NVS region.
- */
-void hibernate_nvs_restore(void)
-{
-        struct nvs_page *entry;
-
-        printk(KERN_INFO "PM: Restoring platform NVS memory\n");
-
-        list_for_each_entry(entry, &nvs_list, node)
-                if (entry->data)
-                        memcpy(entry->kaddr, entry->data, entry->size);
-}
diff --git a/kernel/printk.c b/kernel/printk.c
index 5052b5497c67..b4d97b54c1ec 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -687,20 +687,35 @@ asmlinkage int vprintk(const char *fmt, va_list args)
                                   sizeof(printk_buf) - printed_len, fmt, args);
 
 
+        p = printk_buf;
+
+        /* Do we have a loglevel in the string? */
+        if (p[0] == '<') {
+                unsigned char c = p[1];
+                if (c && p[2] == '>') {
+                        switch (c) {
+                        case '0' ... '7': /* loglevel */
+                                current_log_level = c - '0';
+                        /* Fallthrough - make sure we're on a new line */
+                        case 'd': /* KERN_DEFAULT */
+                                if (!new_text_line) {
+                                        emit_log_char('\n');
+                                        new_text_line = 1;
+                                }
+                        /* Fallthrough - skip the loglevel */
+                        case 'c': /* KERN_CONT */
+                                p += 3;
+                                break;
+                        }
+                }
+        }
+
         /*
          * Copy the output into log_buf.  If the caller didn't provide
          * appropriate log level tags, we insert them here
          */
-        for (p = printk_buf; *p; p++) {
+        for ( ; *p; p++) {
                 if (new_text_line) {
-                        /* If a token, set current_log_level and skip over */
-                        if (p[0] == '<' && p[1] >= '0' && p[1] <= '7' &&
-                            p[2] == '>') {
-                                current_log_level = p[1] - '0';
-                                p += 3;
-                                printed_len -= 3;
-                        }
-
                         /* Always output the token */
                         emit_log_char('<');
                         emit_log_char(current_log_level + '0');
diff --git a/kernel/profile.c b/kernel/profile.c
index 7724e0409bae..69911b5745eb 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -111,12 +111,6 @@ int __ref profile_init(void)
         /* only text is profiled */
         prof_len = (_etext - _stext) >> prof_shift;
         buffer_bytes = prof_len*sizeof(atomic_t);
-        if (!slab_is_available()) {
-                prof_buffer = alloc_bootmem(buffer_bytes);
-                alloc_bootmem_cpumask_var(&prof_cpu_mask);
-                cpumask_copy(prof_cpu_mask, cpu_possible_mask);
-                return 0;
-        }
 
         if (!alloc_cpumask_var(&prof_cpu_mask, GFP_KERNEL))
                 return -ENOMEM;
@@ -371,7 +365,7 @@ static int __cpuinit profile_cpu_callback(struct notifier_block *info,
                 node = cpu_to_node(cpu);
                 per_cpu(cpu_profile_flip, cpu) = 0;
                 if (!per_cpu(cpu_profile_hits, cpu)[1]) {
-                        page = alloc_pages_node(node,
+                        page = alloc_pages_exact_node(node,
                                         GFP_KERNEL | __GFP_ZERO,
                                         0);
                         if (!page)
@@ -379,7 +373,7 @@ static int __cpuinit profile_cpu_callback(struct notifier_block *info,
                         per_cpu(cpu_profile_hits, cpu)[1] = page_address(page);
                 }
                 if (!per_cpu(cpu_profile_hits, cpu)[0]) {
-                        page = alloc_pages_node(node,
+                        page = alloc_pages_exact_node(node,
                                         GFP_KERNEL | __GFP_ZERO,
                                         0);
                         if (!page)
@@ -570,14 +564,14 @@ static int create_hash_tables(void)
                 int node = cpu_to_node(cpu);
                 struct page *page;
 
-                page = alloc_pages_node(node,
+                page = alloc_pages_exact_node(node,
                                 GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
                                 0);
                 if (!page)
                         goto out_cleanup;
                 per_cpu(cpu_profile_hits, cpu)[1]
                                 = (struct profile_hit *)page_address(page);
-                page = alloc_pages_node(node,
+                page = alloc_pages_exact_node(node,
                                 GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
                                 0);
                 if (!page)
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 0692ab5a0d67..61c78b2c07ba 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -25,16 +25,6 @@
 
 
 /*
- * Initialize a new task whose father had been ptraced.
- *
- * Called from copy_process().
- */
-void ptrace_fork(struct task_struct *child, unsigned long clone_flags)
-{
-        arch_ptrace_fork(child, clone_flags);
-}
-
-/*
  * ptrace a task: make the debugger its new parent and
  * move it to the ptrace list.
  *
@@ -177,66 +167,82 @@ bool ptrace_may_access(struct task_struct *task, unsigned int mode)
 int ptrace_attach(struct task_struct *task)
 {
         int retval;
-        unsigned long flags;
 
         audit_ptrace(task);
 
         retval = -EPERM;
+        if (unlikely(task->flags & PF_KTHREAD))
+                goto out;
         if (same_thread_group(task, current))
                 goto out;
 
-        /* Protect exec's credential calculations against our interference;
-         * SUID, SGID and LSM creds get determined differently under ptrace.
+        /*
+         * Protect exec's credential calculations against our interference;
+         * interference; SUID, SGID and LSM creds get determined differently
+         * under ptrace.
          */
-        retval = mutex_lock_interruptible(&task->cred_exec_mutex);
-        if (retval  < 0)
+        retval = mutex_lock_interruptible(&task->cred_guard_mutex);
+        if (retval < 0)
                 goto out;
 
-        retval = -EPERM;
-repeat:
-        /*
-         * Nasty, nasty.
-         *
-         * We want to hold both the task-lock and the
-         * tasklist_lock for writing at the same time.
-         * But that's against the rules (tasklist_lock
-         * is taken for reading by interrupts on other
-         * cpu's that may have task_lock).
-         */
         task_lock(task);
-        if (!write_trylock_irqsave(&tasklist_lock, flags)) {
-                task_unlock(task);
-                do {
-                        cpu_relax();
-                } while (!write_can_lock(&tasklist_lock));
-                goto repeat;
-        }
-
-        if (!task->mm)
-                goto bad;
-        /* the same process cannot be attached many times */
-        if (task->ptrace & PT_PTRACED)
-                goto bad;
         retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH);
+        task_unlock(task);
         if (retval)
-                goto bad;
+                goto unlock_creds;
+
+        write_lock_irq(&tasklist_lock);
+        retval = -EPERM;
+        if (unlikely(task->exit_state))
+                goto unlock_tasklist;
+        if (task->ptrace)
+                goto unlock_tasklist;
 
-        /* Go */
-        task->ptrace |= PT_PTRACED;
+        task->ptrace = PT_PTRACED;
         if (capable(CAP_SYS_PTRACE))
                 task->ptrace |= PT_PTRACE_CAP;
 
         __ptrace_link(task, current);
-
         send_sig_info(SIGSTOP, SEND_SIG_FORCED, task);
-bad:
-        write_unlock_irqrestore(&tasklist_lock, flags);
-        task_unlock(task);
-        mutex_unlock(&task->cred_exec_mutex);
+
+        retval = 0;
+unlock_tasklist:
+        write_unlock_irq(&tasklist_lock);
+unlock_creds:
+        mutex_unlock(&task->cred_guard_mutex);
 out:
         return retval;
 }
 
+/**
+ * ptrace_traceme  --  helper for PTRACE_TRACEME
+ *
+ * Performs checks and sets PT_PTRACED.
+ * Should be used by all ptrace implementations for PTRACE_TRACEME.
+ */
+int ptrace_traceme(void)
+{
+        int ret = -EPERM;
+
+        write_lock_irq(&tasklist_lock);
+        /* Are we already being traced? */
+        if (!current->ptrace) {
+                ret = security_ptrace_traceme(current->parent);
+                /*
+                 * Check PF_EXITING to ensure ->real_parent has not passed
+                 * exit_ptrace(). Otherwise we don't report the error but
+                 * pretend ->real_parent untraces us right after return.
+                 */
+                if (!ret && !(current->real_parent->flags & PF_EXITING)) {
+                        current->ptrace = PT_PTRACED;
+                        __ptrace_link(current, current->real_parent);
+                }
+        }
+        write_unlock_irq(&tasklist_lock);
+
+        return ret;
+}
+
 /*
  * Called with irqs disabled, returns true if childs should reap themselves.
  */
@@ -304,6 +310,8 @@ int ptrace_detach(struct task_struct *child, unsigned int data)
         if (child->ptrace) {
                 child->exit_code = data;
                 dead = __ptrace_detach(current, child);
+                if (!child->exit_state)
+                        wake_up_process(child);
         }
         write_unlock_irq(&tasklist_lock);
 
@@ -416,37 +424,33 @@ static int ptrace_setoptions(struct task_struct *child, long data)
 
 static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)
 {
+        unsigned long flags;
         int error = -ESRCH;
 
-        read_lock(&tasklist_lock);
-        if (likely(child->sighand != NULL)) {
+        if (lock_task_sighand(child, &flags)) {
                 error = -EINVAL;
-                spin_lock_irq(&child->sighand->siglock);
                 if (likely(child->last_siginfo != NULL)) {
                         *info = *child->last_siginfo;
                         error = 0;
                 }
-                spin_unlock_irq(&child->sighand->siglock);
+                unlock_task_sighand(child, &flags);
         }
-        read_unlock(&tasklist_lock);
         return error;
 }
 
 static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)
 {
+        unsigned long flags;
         int error = -ESRCH;
 
-        read_lock(&tasklist_lock);
-        if (likely(child->sighand != NULL)) {
+        if (lock_task_sighand(child, &flags)) {
                 error = -EINVAL;
-                spin_lock_irq(&child->sighand->siglock);
                 if (likely(child->last_siginfo != NULL)) {
                         *child->last_siginfo = *info;
                         error = 0;
                 }
-                spin_unlock_irq(&child->sighand->siglock);
+                unlock_task_sighand(child, &flags);
         }
-        read_unlock(&tasklist_lock);
         return error;
 }
 
@@ -573,72 +577,16 @@ int ptrace_request(struct task_struct *child, long request,
         return ret;
 }
 
-/**
- * ptrace_traceme  --  helper for PTRACE_TRACEME
- *
- * Performs checks and sets PT_PTRACED.
- * Should be used by all ptrace implementations for PTRACE_TRACEME.
- */
-int ptrace_traceme(void)
-{
-        int ret = -EPERM;
-
-        /*
-         * Are we already being traced?
-         */
-repeat:
-        task_lock(current);
-        if (!(current->ptrace & PT_PTRACED)) {
-                /*
-                 * See ptrace_attach() comments about the locking here.
-                 */
-                unsigned long flags;
-                if (!write_trylock_irqsave(&tasklist_lock, flags)) {
-                        task_unlock(current);
-                        do {
-                                cpu_relax();
-                        } while (!write_can_lock(&tasklist_lock));
-                        goto repeat;
-                }
-
-                ret = security_ptrace_traceme(current->parent);
-
-                /*
-                 * Check PF_EXITING to ensure ->real_parent has not passed
-                 * exit_ptrace(). Otherwise we don't report the error but
-                 * pretend ->real_parent untraces us right after return.
-                 */
-                if (!ret && !(current->real_parent->flags & PF_EXITING)) {
-                        current->ptrace |= PT_PTRACED;
-                        __ptrace_link(current, current->real_parent);
-                }
-
-                write_unlock_irqrestore(&tasklist_lock, flags);
-        }
-        task_unlock(current);
-        return ret;
-}
-
-/**
- * ptrace_get_task_struct  --  grab a task struct reference for ptrace
- * @pid:       process id to grab a task_struct reference of
- *
- * This function is a helper for ptrace implementations.  It checks
- * permissions and then grabs a task struct for use of the actual
- * ptrace implementation.
- *
- * Returns the task_struct for @pid or an ERR_PTR() on failure.
- */
-struct task_struct *ptrace_get_task_struct(pid_t pid)
+static struct task_struct *ptrace_get_task_struct(pid_t pid)
 {
         struct task_struct *child;
 
-        read_lock(&tasklist_lock);
+        rcu_read_lock();
         child = find_task_by_vpid(pid);
         if (child)
                 get_task_struct(child);
+        rcu_read_unlock();
 
-        read_unlock(&tasklist_lock);
         if (!child)
                 return ERR_PTR(-ESRCH);
         return child;
diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
index ce97a4df64d3..beb0e659adcc 100644
--- a/kernel/rcupreempt.c
+++ b/kernel/rcupreempt.c
@@ -1356,17 +1356,11 @@ static int rcu_sched_grace_period(void *arg)
 
                 rcu_ctrlblk.sched_sleep = rcu_sched_sleeping;
                 spin_unlock_irqrestore(&rcu_ctrlblk.schedlock, flags);
-                ret = 0;
+                ret = 0; /* unused */
                 __wait_event_interruptible(rcu_ctrlblk.sched_wq,
                         rcu_ctrlblk.sched_sleep != rcu_sched_sleeping,
                         ret);
 
-                /*
-                 * Signals would prevent us from sleeping, and we cannot
-                 * do much with them in any case.  So flush them.
-                 */
-                if (ret)
-                        flush_signals(current);
                 couldsleepnext = 0;
 
         } while (!kthread_should_stop());
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index d2a372fb0b9b..0dccfbba6d26 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1259,31 +1259,44 @@ static int __rcu_pending(struct rcu_state *rsp, struct rcu_data *rdp)
         check_cpu_stall(rsp, rdp);
 
         /* Is the RCU core waiting for a quiescent state from this CPU? */
-        if (rdp->qs_pending)
+        if (rdp->qs_pending) {
+                rdp->n_rp_qs_pending++;
                 return 1;
+        }
 
         /* Does this CPU have callbacks ready to invoke? */
-        if (cpu_has_callbacks_ready_to_invoke(rdp))
+        if (cpu_has_callbacks_ready_to_invoke(rdp)) {
+                rdp->n_rp_cb_ready++;
                 return 1;
+        }
 
         /* Has RCU gone idle with this CPU needing another grace period? */
-        if (cpu_needs_another_gp(rsp, rdp))
+        if (cpu_needs_another_gp(rsp, rdp)) {
+                rdp->n_rp_cpu_needs_gp++;
                 return 1;
+        }
 
         /* Has another RCU grace period completed?  */
-        if (ACCESS_ONCE(rsp->completed) != rdp->completed) /* outside of lock */
+        if (ACCESS_ONCE(rsp->completed) != rdp->completed) { /* outside lock */
+                rdp->n_rp_gp_completed++;
                 return 1;
+        }
 
         /* Has a new RCU grace period started? */
-        if (ACCESS_ONCE(rsp->gpnum) != rdp->gpnum) /* outside of lock */
+        if (ACCESS_ONCE(rsp->gpnum) != rdp->gpnum) { /* outside lock */
+                rdp->n_rp_gp_started++;
                 return 1;
+        }
 
         /* Has an RCU GP gone long enough to send resched IPIs &c? */
         if (ACCESS_ONCE(rsp->completed) != ACCESS_ONCE(rsp->gpnum) &&
-            ((long)(ACCESS_ONCE(rsp->jiffies_force_qs) - jiffies) < 0))
+            ((long)(ACCESS_ONCE(rsp->jiffies_force_qs) - jiffies) < 0)) {
+                rdp->n_rp_need_fqs++;
                 return 1;
+        }
 
         /* nothing to do */
+        rdp->n_rp_need_nothing++;
         return 0;
 }
 
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index 4b1875ba9404..fe1dcdbf1ca3 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -213,7 +213,63 @@ static struct file_operations rcugp_fops = {
         .release = single_release,
 };
 
-static struct dentry *rcudir, *datadir, *datadir_csv, *hierdir, *gpdir;
+static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp)
+{
+        seq_printf(m, "%3d%cnp=%ld "
+                   "qsp=%ld cbr=%ld cng=%ld gpc=%ld gps=%ld nf=%ld nn=%ld\n",
+                   rdp->cpu,
+                   cpu_is_offline(rdp->cpu) ? '!' : ' ',
+                   rdp->n_rcu_pending,
+                   rdp->n_rp_qs_pending,
+                   rdp->n_rp_cb_ready,
+                   rdp->n_rp_cpu_needs_gp,
+                   rdp->n_rp_gp_completed,
+                   rdp->n_rp_gp_started,
+                   rdp->n_rp_need_fqs,
+                   rdp->n_rp_need_nothing);
+}
+
+static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp)
+{
+        int cpu;
+        struct rcu_data *rdp;
+
+        for_each_possible_cpu(cpu) {
+                rdp = rsp->rda[cpu];
+                if (rdp->beenonline)
+                        print_one_rcu_pending(m, rdp);
+        }
+}
+
+static int show_rcu_pending(struct seq_file *m, void *unused)
+{
+        seq_puts(m, "rcu:\n");
+        print_rcu_pendings(m, &rcu_state);
+        seq_puts(m, "rcu_bh:\n");
+        print_rcu_pendings(m, &rcu_bh_state);
+        return 0;
+}
+
+static int rcu_pending_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, show_rcu_pending, NULL);
+}
+
+static struct file_operations rcu_pending_fops = {
+        .owner = THIS_MODULE,
+        .open = rcu_pending_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static struct dentry *rcudir;
+static struct dentry *datadir;
+static struct dentry *datadir_csv;
+static struct dentry *gpdir;
+static struct dentry *hierdir;
+static struct dentry *rcu_pendingdir;
+
 static int __init rcuclassic_trace_init(void)
 {
         rcudir = debugfs_create_dir("rcu", NULL);
@@ -238,6 +294,11 @@ static int __init rcuclassic_trace_init(void)
                                                 NULL, &rcuhier_fops);
         if (!hierdir)
                 goto free_out;
+
+        rcu_pendingdir = debugfs_create_file("rcu_pending", 0444, rcudir,
+                                                NULL, &rcu_pending_fops);
+        if (!rcu_pendingdir)
+                goto free_out;
         return 0;
 free_out:
         if (datadir)
@@ -257,6 +318,7 @@ static void __exit rcuclassic_trace_cleanup(void)
         debugfs_remove(datadir_csv);
         debugfs_remove(gpdir);
         debugfs_remove(hierdir);
+        debugfs_remove(rcu_pendingdir);
         debugfs_remove(rcudir);
 }
 
diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index bf8e7534c803..e1338f074314 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -18,7 +18,7 @@
 void res_counter_init(struct res_counter *counter, struct res_counter *parent)
 {
         spin_lock_init(&counter->lock);
-        counter->limit = (unsigned long long)LLONG_MAX;
+        counter->limit = RESOURCE_MAX;
         counter->parent = parent;
 }
 
@@ -133,6 +133,16 @@ int res_counter_memparse_write_strategy(const char *buf,
                                         unsigned long long *res)
 {
         char *end;
+
+        /* return RESOURCE_MAX(unlimited) if "-1" is specified */
+        if (*buf == '-') {
+                *res = simple_strtoull(buf + 1, &end, 10);
+                if (*res != 1 || *end != '\0')
+                        return -EINVAL;
+                *res = RESOURCE_MAX;
+                return 0;
+        }
+
         /* FIXME - make memparse() take const char* args */
         *res = memparse((char *)buf, &end);
         if (*end != '\0')
diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index 69d9cb921ffa..fcd107a78c5a 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -300,7 +300,8 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
  * assigned pending owner [which might not have taken the
  * lock yet]:
  */
-static inline int try_to_steal_lock(struct rt_mutex *lock)
+static inline int try_to_steal_lock(struct rt_mutex *lock,
+                                    struct task_struct *task)
 {
         struct task_struct *pendowner = rt_mutex_owner(lock);
         struct rt_mutex_waiter *next;
@@ -309,11 +310,11 @@ static inline int try_to_steal_lock(struct rt_mutex *lock)
         if (!rt_mutex_owner_pending(lock))
                 return 0;
 
-        if (pendowner == current)
+        if (pendowner == task)
                 return 1;
 
         spin_lock_irqsave(&pendowner->pi_lock, flags);
-        if (current->prio >= pendowner->prio) {
+        if (task->prio >= pendowner->prio) {
                 spin_unlock_irqrestore(&pendowner->pi_lock, flags);
                 return 0;
         }
@@ -338,21 +339,21 @@ static inline int try_to_steal_lock(struct rt_mutex *lock)
          * We are going to steal the lock and a waiter was
          * enqueued on the pending owners pi_waiters queue. So
          * we have to enqueue this waiter into
-         * current->pi_waiters list. This covers the case,
-         * where current is boosted because it holds another
+         * task->pi_waiters list. This covers the case,
+         * where task is boosted because it holds another
          * lock and gets unboosted because the booster is
          * interrupted, so we would delay a waiter with higher
-         * priority as current->normal_prio.
+         * priority as task->normal_prio.
          *
          * Note: in the rare case of a SCHED_OTHER task changing
          * its priority and thus stealing the lock, next->task
-         * might be current:
+         * might be task:
          */
-        if (likely(next->task != current)) {
-                spin_lock_irqsave(&current->pi_lock, flags);
-                plist_add(&next->pi_list_entry, &current->pi_waiters);
-                __rt_mutex_adjust_prio(current);
-                spin_unlock_irqrestore(&current->pi_lock, flags);
+        if (likely(next->task != task)) {
+                spin_lock_irqsave(&task->pi_lock, flags);
+                plist_add(&next->pi_list_entry, &task->pi_waiters);
+                __rt_mutex_adjust_prio(task);
+                spin_unlock_irqrestore(&task->pi_lock, flags);
         }
         return 1;
 }
@@ -389,7 +390,7 @@ static int try_to_take_rt_mutex(struct rt_mutex *lock)
          */
         mark_rt_mutex_waiters(lock);
 
-        if (rt_mutex_owner(lock) && !try_to_steal_lock(lock))
+        if (rt_mutex_owner(lock) && !try_to_steal_lock(lock, current))
                 return 0;
 
         /* We got the lock. */
@@ -411,6 +412,7 @@ static int try_to_take_rt_mutex(struct rt_mutex *lock)
  */
 static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
                                    struct rt_mutex_waiter *waiter,
+                                   struct task_struct *task,
                                    int detect_deadlock)
 {
         struct task_struct *owner = rt_mutex_owner(lock);
@@ -418,21 +420,21 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
         unsigned long flags;
         int chain_walk = 0, res;
 
-        spin_lock_irqsave(&current->pi_lock, flags);
-        __rt_mutex_adjust_prio(current);
-        waiter->task = current;
+        spin_lock_irqsave(&task->pi_lock, flags);
+        __rt_mutex_adjust_prio(task);
+        waiter->task = task;
         waiter->lock = lock;
-        plist_node_init(&waiter->list_entry, current->prio);
-        plist_node_init(&waiter->pi_list_entry, current->prio);
+        plist_node_init(&waiter->list_entry, task->prio);
+        plist_node_init(&waiter->pi_list_entry, task->prio);
 
         /* Get the top priority waiter on the lock */
         if (rt_mutex_has_waiters(lock))
                 top_waiter = rt_mutex_top_waiter(lock);
         plist_add(&waiter->list_entry, &lock->wait_list);
 
-        current->pi_blocked_on = waiter;
+        task->pi_blocked_on = waiter;
 
-        spin_unlock_irqrestore(&current->pi_lock, flags);
+        spin_unlock_irqrestore(&task->pi_lock, flags);
 
         if (waiter == rt_mutex_top_waiter(lock)) {
                 spin_lock_irqsave(&owner->pi_lock, flags);
@@ -460,7 +462,7 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
         spin_unlock(&lock->wait_lock);
 
         res = rt_mutex_adjust_prio_chain(owner, detect_deadlock, lock, waiter,
-                                         current);
+                                         task);
 
         spin_lock(&lock->wait_lock);
 
@@ -605,37 +607,25 @@ void rt_mutex_adjust_pi(struct task_struct *task)
         rt_mutex_adjust_prio_chain(task, 0, NULL, NULL, task);
 }
 
-/*
- * Slow path lock function:
+/**
+ * __rt_mutex_slowlock() - Perform the wait-wake-try-to-take loop
+ * @lock:                the rt_mutex to take
+ * @state:               the state the task should block in (TASK_INTERRUPTIBLE
+ *                       or TASK_UNINTERRUPTIBLE)
+ * @timeout:             the pre-initialized and started timer, or NULL for none
+ * @waiter:              the pre-initialized rt_mutex_waiter
+ * @detect_deadlock:     passed to task_blocks_on_rt_mutex
+ *
+ * lock->wait_lock must be held by the caller.
  */
 static int __sched
-rt_mutex_slowlock(struct rt_mutex *lock, int state,
-                  struct hrtimer_sleeper *timeout,
-                  int detect_deadlock)
+__rt_mutex_slowlock(struct rt_mutex *lock, int state,
+                    struct hrtimer_sleeper *timeout,
+                    struct rt_mutex_waiter *waiter,
+                    int detect_deadlock)
 {
-        struct rt_mutex_waiter waiter;
         int ret = 0;
 
-        debug_rt_mutex_init_waiter(&waiter);
-        waiter.task = NULL;
-
-        spin_lock(&lock->wait_lock);
-
-        /* Try to acquire the lock again: */
-        if (try_to_take_rt_mutex(lock)) {
-                spin_unlock(&lock->wait_lock);
-                return 0;
-        }
-
-        set_current_state(state);
-
-        /* Setup the timer, when timeout != NULL */
-        if (unlikely(timeout)) {
-                hrtimer_start_expires(&timeout->timer, HRTIMER_MODE_ABS);
-                if (!hrtimer_active(&timeout->timer))
-                        timeout->task = NULL;
-        }
-
         for (;;) {
                 /* Try to acquire the lock: */
                 if (try_to_take_rt_mutex(lock))
@@ -656,19 +646,19 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
                 }
 
                 /*
-                 * waiter.task is NULL the first time we come here and
+                 * waiter->task is NULL the first time we come here and
                  * when we have been woken up by the previous owner
                  * but the lock got stolen by a higher prio task.
                  */
-                if (!waiter.task) {
-                        ret = task_blocks_on_rt_mutex(lock, &waiter,
+                if (!waiter->task) {
+                        ret = task_blocks_on_rt_mutex(lock, waiter, current,
                                                       detect_deadlock);
                         /*
                          * If we got woken up by the owner then start loop
                          * all over without going into schedule to try
                          * to get the lock now:
                          */
-                        if (unlikely(!waiter.task)) {
+                        if (unlikely(!waiter->task)) {
                                 /*
                                  * Reset the return value. We might
                                  * have returned with -EDEADLK and the
@@ -684,15 +674,52 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
 
                 spin_unlock(&lock->wait_lock);
 
-                debug_rt_mutex_print_deadlock(&waiter);
+                debug_rt_mutex_print_deadlock(waiter);
 
-                if (waiter.task)
+                if (waiter->task)
                         schedule_rt_mutex(lock);
 
                 spin_lock(&lock->wait_lock);
                 set_current_state(state);
         }
 
+        return ret;
+}
+
+/*
+ * Slow path lock function:
+ */
+static int __sched
+rt_mutex_slowlock(struct rt_mutex *lock, int state,
+                  struct hrtimer_sleeper *timeout,
+                  int detect_deadlock)
+{
+        struct rt_mutex_waiter waiter;
+        int ret = 0;
+
+        debug_rt_mutex_init_waiter(&waiter);
+        waiter.task = NULL;
+
+        spin_lock(&lock->wait_lock);
+
+        /* Try to acquire the lock again: */
+        if (try_to_take_rt_mutex(lock)) {
+                spin_unlock(&lock->wait_lock);
+                return 0;
+        }
+
+        set_current_state(state);
+
+        /* Setup the timer, when timeout != NULL */
+        if (unlikely(timeout)) {
+                hrtimer_start_expires(&timeout->timer, HRTIMER_MODE_ABS);
+                if (!hrtimer_active(&timeout->timer))
+                        timeout->task = NULL;
+        }
+
+        ret = __rt_mutex_slowlock(lock, state, timeout, &waiter,
+                                  detect_deadlock);
+
         set_current_state(TASK_RUNNING);
 
         if (unlikely(waiter.task))
@@ -864,9 +891,9 @@ int __sched rt_mutex_lock_interruptible(struct rt_mutex *lock,
 EXPORT_SYMBOL_GPL(rt_mutex_lock_interruptible);
 
 /**
- * rt_mutex_lock_interruptible_ktime - lock a rt_mutex interruptible
- *                                     the timeout structure is provided
- *                                     by the caller
+ * rt_mutex_timed_lock - lock a rt_mutex interruptible
+ *                      the timeout structure is provided
+ *                      by the caller
  *
  * @lock:               the rt_mutex to be locked
  * @timeout:            timeout structure or NULL (no timeout)
@@ -875,7 +902,7 @@ EXPORT_SYMBOL_GPL(rt_mutex_lock_interruptible);
  * Returns:
  *  0           on success
  * -EINTR       when interrupted by a signal
- * -ETIMEOUT    when the timeout expired
+ * -ETIMEDOUT   when the timeout expired
  * -EDEADLK     when the lock would deadlock (when deadlock detection is on)
  */
 int
@@ -913,7 +940,7 @@ void __sched rt_mutex_unlock(struct rt_mutex *lock)
 }
 EXPORT_SYMBOL_GPL(rt_mutex_unlock);
 
-/***
+/**
  * rt_mutex_destroy - mark a mutex unusable
  * @lock: the mutex to be destroyed
  *
@@ -986,6 +1013,59 @@ void rt_mutex_proxy_unlock(struct rt_mutex *lock,
 }
 
 /**
+ * rt_mutex_start_proxy_lock() - Start lock acquisition for another task
+ * @lock:               the rt_mutex to take
+ * @waiter:             the pre-initialized rt_mutex_waiter
+ * @task:               the task to prepare
+ * @detect_deadlock:    perform deadlock detection (1) or not (0)
+ *
+ * Returns:
+ *  0 - task blocked on lock
+ *  1 - acquired the lock for task, caller should wake it up
+ * <0 - error
+ *
+ * Special API call for FUTEX_REQUEUE_PI support.
+ */
+int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
+                              struct rt_mutex_waiter *waiter,
+                              struct task_struct *task, int detect_deadlock)
+{
+        int ret;
+
+        spin_lock(&lock->wait_lock);
+
+        mark_rt_mutex_waiters(lock);
+
+        if (!rt_mutex_owner(lock) || try_to_steal_lock(lock, task)) {
+                /* We got the lock for task. */
+                debug_rt_mutex_lock(lock);
+
+                rt_mutex_set_owner(lock, task, 0);
+
+                rt_mutex_deadlock_account_lock(lock, task);
+                return 1;
+        }
+
+        ret = task_blocks_on_rt_mutex(lock, waiter, task, detect_deadlock);
+
+
+        if (ret && !waiter->task) {
+                /*
+                 * Reset the return value. We might have
+                 * returned with -EDEADLK and the owner
+                 * released the lock while we were walking the
+                 * pi chain.  Let the waiter sort it out.
+                 */
+                ret = 0;
+        }
+        spin_unlock(&lock->wait_lock);
+
+        debug_rt_mutex_print_deadlock(waiter);
+
+        return ret;
+}
+
+/**
  * rt_mutex_next_owner - return the next owner of the lock
  *
  * @lock: the rt lock query
@@ -1004,3 +1084,57 @@ struct task_struct *rt_mutex_next_owner(struct rt_mutex *lock)
 
         return rt_mutex_top_waiter(lock)->task;
 }
+
+/**
+ * rt_mutex_finish_proxy_lock() - Complete lock acquisition
+ * @lock:               the rt_mutex we were woken on
+ * @to:                 the timeout, null if none. hrtimer should already have
+ *                      been started.
+ * @waiter:             the pre-initialized rt_mutex_waiter
+ * @detect_deadlock:    perform deadlock detection (1) or not (0)
+ *
+ * Complete the lock acquisition started our behalf by another thread.
+ *
+ * Returns:
+ *  0 - success
+ * <0 - error, one of -EINTR, -ETIMEDOUT, or -EDEADLK
+ *
+ * Special API call for PI-futex requeue support
+ */
+int rt_mutex_finish_proxy_lock(struct rt_mutex *lock,
+                               struct hrtimer_sleeper *to,
+                               struct rt_mutex_waiter *waiter,
+                               int detect_deadlock)
+{
+        int ret;
+
+        spin_lock(&lock->wait_lock);
+
+        set_current_state(TASK_INTERRUPTIBLE);
+
+        ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter,
+                                  detect_deadlock);
+
+        set_current_state(TASK_RUNNING);
+
+        if (unlikely(waiter->task))
+                remove_waiter(lock, waiter);
+
+        /*
+         * try_to_take_rt_mutex() sets the waiter bit unconditionally. We might
+         * have to fix that up.
+         */
+        fixup_rt_mutex_waiters(lock);
+
+        spin_unlock(&lock->wait_lock);
+
+        /*
+         * Readjust priority, when we did not get the lock. We might have been
+         * the pending owner and boosted. Since we did not take the lock, the
+         * PI boost has to go.
+         */
+        if (unlikely(ret))
+                rt_mutex_adjust_prio(current);
+
+        return ret;
+}
diff --git a/kernel/rtmutex_common.h b/kernel/rtmutex_common.h
index e124bf5800ea..97a2f81866af 100644
--- a/kernel/rtmutex_common.h
+++ b/kernel/rtmutex_common.h
@@ -120,6 +120,14 @@ extern void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
                                        struct task_struct *proxy_owner);
 extern void rt_mutex_proxy_unlock(struct rt_mutex *lock,
                                   struct task_struct *proxy_owner);
+extern int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
+                                     struct rt_mutex_waiter *waiter,
+                                     struct task_struct *task,
+                                     int detect_deadlock);
+extern int rt_mutex_finish_proxy_lock(struct rt_mutex *lock,
+                                      struct hrtimer_sleeper *to,
+                                      struct rt_mutex_waiter *waiter,
+                                      int detect_deadlock);
 
 #ifdef CONFIG_DEBUG_RT_MUTEXES
 # include "rtmutex-debug.h"
diff --git a/kernel/sched.c b/kernel/sched.c
index 26efa475bdc1..7c9098d186e6 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -39,6 +39,7 @@
 #include <linux/completion.h>
 #include <linux/kernel_stat.h>
 #include <linux/debug_locks.h>
+#include <linux/perf_counter.h>
 #include <linux/security.h>
 #include <linux/notifier.h>
 #include <linux/profile.h>
@@ -68,17 +69,18 @@
 #include <linux/pagemap.h>
 #include <linux/hrtimer.h>
 #include <linux/tick.h>
-#include <linux/bootmem.h>
 #include <linux/debugfs.h>
 #include <linux/ctype.h>
 #include <linux/ftrace.h>
-#include <trace/sched.h>
 
 #include <asm/tlb.h>
 #include <asm/irq_regs.h>
 
 #include "sched_cpupri.h"
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/sched.h>
+
 /*
  * Convert user-nice values [ -20 ... 0 ... 19 ]
  * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
@@ -118,12 +120,6 @@
  */
 #define RUNTIME_INF     ((u64)~0ULL)
 
-DEFINE_TRACE(sched_wait_task);
-DEFINE_TRACE(sched_wakeup);
-DEFINE_TRACE(sched_wakeup_new);
-DEFINE_TRACE(sched_switch);
-DEFINE_TRACE(sched_migrate_task);
-
 #ifdef CONFIG_SMP
 
 static void double_rq_lock(struct rq *rq1, struct rq *rq2);
@@ -244,7 +240,7 @@ static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
                 hard = hrtimer_get_expires(&rt_b->rt_period_timer);
                 delta = ktime_to_ns(ktime_sub(hard, soft));
                 __hrtimer_start_range_ns(&rt_b->rt_period_timer, soft, delta,
-                                HRTIMER_MODE_ABS, 0);
+                                HRTIMER_MODE_ABS_PINNED, 0);
         }
         spin_unlock(&rt_b->rt_runtime_lock);
 }
@@ -584,6 +580,7 @@ struct rq {
         struct load_weight load;
         unsigned long nr_load_updates;
         u64 nr_switches;
+        u64 nr_migrations_in;
 
         struct cfs_rq cfs;
         struct rt_rq rt;
@@ -630,6 +627,10 @@ struct rq {
         struct list_head migration_queue;
 #endif
 
+        /* calc_load related fields */
+        unsigned long calc_load_update;
+        long calc_load_active;
+
 #ifdef CONFIG_SCHED_HRTICK
 #ifdef CONFIG_SMP
         int hrtick_csd_pending;
@@ -692,7 +693,7 @@ static inline int cpu_of(struct rq *rq)
 #define task_rq(p)              cpu_rq(task_cpu(p))
 #define cpu_curr(cpu)           (cpu_rq(cpu)->curr)
 
-static inline void update_rq_clock(struct rq *rq)
+inline void update_rq_clock(struct rq *rq)
 {
         rq->clock = sched_clock_cpu(cpu_of(rq));
 }
@@ -1154,7 +1155,7 @@ static __init void init_hrtick(void)
 static void hrtick_start(struct rq *rq, u64 delay)
 {
         __hrtimer_start_range_ns(&rq->hrtick_timer, ns_to_ktime(delay), 0,
-                        HRTIMER_MODE_REL, 0);
+                        HRTIMER_MODE_REL_PINNED, 0);
 }
 
 static inline void init_hrtick(void)
@@ -1728,6 +1729,8 @@ static void cfs_rq_set_shares(struct cfs_rq *cfs_rq, unsigned long shares)
 }
 #endif
 
+static void calc_load_account_active(struct rq *this_rq);
+
 #include "sched_stats.h"
 #include "sched_idletask.c"
 #include "sched_fair.c"
@@ -1958,7 +1961,7 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
 
         clock_offset = old_rq->clock - new_rq->clock;
 
-        trace_sched_migrate_task(p, task_cpu(p), new_cpu);
+        trace_sched_migrate_task(p, new_cpu);
 
 #ifdef CONFIG_SCHEDSTATS
         if (p->se.wait_start)
@@ -1967,12 +1970,17 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
                 p->se.sleep_start -= clock_offset;
         if (p->se.block_start)
                 p->se.block_start -= clock_offset;
+#endif
         if (old_cpu != new_cpu) {
-                schedstat_inc(p, se.nr_migrations);
+                p->se.nr_migrations++;
+                new_rq->nr_migrations_in++;
+#ifdef CONFIG_SCHEDSTATS
                 if (task_hot(p, old_rq->clock, NULL))
                         schedstat_inc(p, se.nr_forced2_migrations);
-        }
 #endif
+                perf_swcounter_event(PERF_COUNT_SW_CPU_MIGRATIONS,
+                                     1, 1, NULL, 0);
+        }
         p->se.vruntime -= old_cfsrq->min_vruntime -
                                          new_cfsrq->min_vruntime;
 
@@ -2015,6 +2023,49 @@ migrate_task(struct task_struct *p, int dest_cpu, struct migration_req *req)
 }
 
 /*
+ * wait_task_context_switch -   wait for a thread to complete at least one
+ *                              context switch.
+ *
+ * @p must not be current.
+ */
+void wait_task_context_switch(struct task_struct *p)
+{
+        unsigned long nvcsw, nivcsw, flags;
+        int running;
+        struct rq *rq;
+
+        nvcsw   = p->nvcsw;
+        nivcsw  = p->nivcsw;
+        for (;;) {
+                /*
+                 * The runqueue is assigned before the actual context
+                 * switch. We need to take the runqueue lock.
+                 *
+                 * We could check initially without the lock but it is
+                 * very likely that we need to take the lock in every
+                 * iteration.
+                 */
+                rq = task_rq_lock(p, &flags);
+                running = task_running(rq, p);
+                task_rq_unlock(rq, &flags);
+
+                if (likely(!running))
+                        break;
+                /*
+                 * The switch count is incremented before the actual
+                 * context switch. We thus wait for two switches to be
+                 * sure at least one completed.
+                 */
+                if ((p->nvcsw - nvcsw) > 1)
+                        break;
+                if ((p->nivcsw - nivcsw) > 1)
+                        break;
+
+                cpu_relax();
+        }
+}
+
+/*
  * wait_task_inactive - wait for a thread to unschedule.
  *
  * If @match_state is nonzero, it's the @p->state value just checked and
@@ -2142,6 +2193,7 @@ void kick_process(struct task_struct *p)
                 smp_send_reschedule(cpu);
         preempt_enable();
 }
+EXPORT_SYMBOL_GPL(kick_process);
 
 /*
  * Return a low guess at the load of a migration-source cpu weighted
@@ -2324,6 +2376,27 @@ static int sched_balance_self(int cpu, int flag)
 
 #endif /* CONFIG_SMP */
 
+/**
+ * task_oncpu_function_call - call a function on the cpu on which a task runs
+ * @p:          the task to evaluate
+ * @func:       the function to be called
+ * @info:       the function call argument
+ *
+ * Calls the function @func when the task is currently running. This might
+ * be on the current CPU, which just calls the function directly
+ */
+void task_oncpu_function_call(struct task_struct *p,
+                              void (*func) (void *info), void *info)
+{
+        int cpu;
+
+        preempt_disable();
+        cpu = task_cpu(p);
+        if (task_curr(p))
+                smp_call_function_single(cpu, func, info, 1);
+        preempt_enable();
+}
+
 /***
  * try_to_wake_up - wake up a thread
  * @p: the to-be-woken-up thread
@@ -2458,6 +2531,17 @@ out:
         return success;
 }
 
+/**
+ * wake_up_process - Wake up a specific process
+ * @p: The process to be woken up.
+ *
+ * Attempt to wake up the nominated process and move it to the set of runnable
+ * processes.  Returns 1 if the process was woken up, 0 if it was already
+ * running.
+ *
+ * It may be assumed that this function implies a write memory barrier before
+ * changing the task state if and only if any tasks are woken up.
+ */
 int wake_up_process(struct task_struct *p)
 {
         return try_to_wake_up(p, TASK_ALL, 0);
@@ -2480,6 +2564,7 @@ static void __sched_fork(struct task_struct *p)
         p->se.exec_start                = 0;
         p->se.sum_exec_runtime          = 0;
         p->se.prev_sum_exec_runtime     = 0;
+        p->se.nr_migrations             = 0;
         p->se.last_wakeup               = 0;
         p->se.avg_overlap               = 0;
         p->se.start_runtime             = 0;
@@ -2710,6 +2795,7 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
          */
         prev_state = prev->state;
         finish_arch_switch(prev);
+        perf_counter_task_sched_in(current, cpu_of(rq));
         finish_lock_switch(rq, prev);
 #ifdef CONFIG_SMP
         if (post_schedule)
@@ -2766,7 +2852,7 @@ context_switch(struct rq *rq, struct task_struct *prev,
          * combine the page table reload and the switch backend into
          * one hypercall.
          */
-        arch_enter_lazy_cpu_mode();
+        arch_start_context_switch(prev);
 
         if (unlikely(!mm)) {
                 next->active_mm = oldmm;
@@ -2856,19 +2942,81 @@ unsigned long nr_iowait(void)
         return sum;
 }
 
-unsigned long nr_active(void)
+/* Variables and functions for calc_load */
+static atomic_long_t calc_load_tasks;
+static unsigned long calc_load_update;
+unsigned long avenrun[3];
+EXPORT_SYMBOL(avenrun);
+
+/**
+ * get_avenrun - get the load average array
+ * @loads:      pointer to dest load array
+ * @offset:     offset to add
+ * @shift:      shift count to shift the result left
+ *
+ * These values are estimates at best, so no need for locking.
+ */
+void get_avenrun(unsigned long *loads, unsigned long offset, int shift)
 {
-        unsigned long i, running = 0, uninterruptible = 0;
+        loads[0] = (avenrun[0] + offset) << shift;
+        loads[1] = (avenrun[1] + offset) << shift;
+        loads[2] = (avenrun[2] + offset) << shift;
+}
 
-        for_each_online_cpu(i) {
-                running += cpu_rq(i)->nr_running;
-                uninterruptible += cpu_rq(i)->nr_uninterruptible;
-        }
+static unsigned long
+calc_load(unsigned long load, unsigned long exp, unsigned long active)
+{
+        load *= exp;
+        load += active * (FIXED_1 - exp);
+        return load >> FSHIFT;
+}
+
+/*
+ * calc_load - update the avenrun load estimates 10 ticks after the
+ * CPUs have updated calc_load_tasks.
+ */
+void calc_global_load(void)
+{
+        unsigned long upd = calc_load_update + 10;
+        long active;
+
+        if (time_before(jiffies, upd))
+                return;
+
+        active = atomic_long_read(&calc_load_tasks);
+        active = active > 0 ? active * FIXED_1 : 0;
+
+        avenrun[0] = calc_load(avenrun[0], EXP_1, active);
+        avenrun[1] = calc_load(avenrun[1], EXP_5, active);
+        avenrun[2] = calc_load(avenrun[2], EXP_15, active);
+
+        calc_load_update += LOAD_FREQ;
+}
+
+/*
+ * Either called from update_cpu_load() or from a cpu going idle
+ */
+static void calc_load_account_active(struct rq *this_rq)
+{
+        long nr_active, delta;
+
+        nr_active = this_rq->nr_running;
+        nr_active += (long) this_rq->nr_uninterruptible;
 
-        if (unlikely((long)uninterruptible < 0))
-                uninterruptible = 0;
+        if (nr_active != this_rq->calc_load_active) {
+                delta = nr_active - this_rq->calc_load_active;
+                this_rq->calc_load_active = nr_active;
+                atomic_long_add(delta, &calc_load_tasks);
+        }
+}
 
-        return running + uninterruptible;
+/*
+ * Externally visible per-cpu scheduler statistics:
+ * cpu_nr_migrations(cpu) - number of migrations into that cpu
+ */
+u64 cpu_nr_migrations(int cpu)
+{
+        return cpu_rq(cpu)->nr_migrations_in;
 }
 
 /*
@@ -2899,6 +3047,11 @@ static void update_cpu_load(struct rq *this_rq)
                         new_load += scale-1;
                 this_rq->cpu_load[i] = (old_load*(scale-1) + new_load) >> i;
         }
+
+        if (time_after_eq(jiffies, this_rq->calc_load_update)) {
+                this_rq->calc_load_update += LOAD_FREQ;
+                calc_load_account_active(this_rq);
+        }
 }
 
 #ifdef CONFIG_SMP
@@ -4240,10 +4393,131 @@ static void active_load_balance(struct rq *busiest_rq, int busiest_cpu)
 static struct {
         atomic_t load_balancer;
         cpumask_var_t cpu_mask;
+        cpumask_var_t ilb_grp_nohz_mask;
 } nohz ____cacheline_aligned = {
         .load_balancer = ATOMIC_INIT(-1),
 };
 
+int get_nohz_load_balancer(void)
+{
+        return atomic_read(&nohz.load_balancer);
+}
+
+#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
+/**
+ * lowest_flag_domain - Return lowest sched_domain containing flag.
+ * @cpu:        The cpu whose lowest level of sched domain is to
+ *              be returned.
+ * @flag:       The flag to check for the lowest sched_domain
+ *              for the given cpu.
+ *
+ * Returns the lowest sched_domain of a cpu which contains the given flag.
+ */
+static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
+{
+        struct sched_domain *sd;
+
+        for_each_domain(cpu, sd)
+                if (sd && (sd->flags & flag))
+                        break;
+
+        return sd;
+}
+
+/**
+ * for_each_flag_domain - Iterates over sched_domains containing the flag.
+ * @cpu:        The cpu whose domains we're iterating over.
+ * @sd:         variable holding the value of the power_savings_sd
+ *              for cpu.
+ * @flag:       The flag to filter the sched_domains to be iterated.
+ *
+ * Iterates over all the scheduler domains for a given cpu that has the 'flag'
+ * set, starting from the lowest sched_domain to the highest.
+ */
+#define for_each_flag_domain(cpu, sd, flag) \
+        for (sd = lowest_flag_domain(cpu, flag); \
+                (sd && (sd->flags & flag)); sd = sd->parent)
+
+/**
+ * is_semi_idle_group - Checks if the given sched_group is semi-idle.
+ * @ilb_group:  group to be checked for semi-idleness
+ *
+ * Returns:     1 if the group is semi-idle. 0 otherwise.
+ *
+ * We define a sched_group to be semi idle if it has atleast one idle-CPU
+ * and atleast one non-idle CPU. This helper function checks if the given
+ * sched_group is semi-idle or not.
+ */
+static inline int is_semi_idle_group(struct sched_group *ilb_group)
+{
+        cpumask_and(nohz.ilb_grp_nohz_mask, nohz.cpu_mask,
+                                        sched_group_cpus(ilb_group));
+
+        /*
+         * A sched_group is semi-idle when it has atleast one busy cpu
+         * and atleast one idle cpu.
+         */
+        if (cpumask_empty(nohz.ilb_grp_nohz_mask))
+                return 0;
+
+        if (cpumask_equal(nohz.ilb_grp_nohz_mask, sched_group_cpus(ilb_group)))
+                return 0;
+
+        return 1;
+}
+/**
+ * find_new_ilb - Finds the optimum idle load balancer for nomination.
+ * @cpu:        The cpu which is nominating a new idle_load_balancer.
+ *
+ * Returns:     Returns the id of the idle load balancer if it exists,
+ *              Else, returns >= nr_cpu_ids.
+ *
+ * This algorithm picks the idle load balancer such that it belongs to a
+ * semi-idle powersavings sched_domain. The idea is to try and avoid
+ * completely idle packages/cores just for the purpose of idle load balancing
+ * when there are other idle cpu's which are better suited for that job.
+ */
+static int find_new_ilb(int cpu)
+{
+        struct sched_domain *sd;
+        struct sched_group *ilb_group;
+
+        /*
+         * Have idle load balancer selection from semi-idle packages only
+         * when power-aware load balancing is enabled
+         */
+        if (!(sched_smt_power_savings || sched_mc_power_savings))
+                goto out_done;
+
+        /*
+         * Optimize for the case when we have no idle CPUs or only one
+         * idle CPU. Don't walk the sched_domain hierarchy in such cases
+         */
+        if (cpumask_weight(nohz.cpu_mask) < 2)
+                goto out_done;
+
+        for_each_flag_domain(cpu, sd, SD_POWERSAVINGS_BALANCE) {
+                ilb_group = sd->groups;
+
+                do {
+                        if (is_semi_idle_group(ilb_group))
+                                return cpumask_first(nohz.ilb_grp_nohz_mask);
+
+                        ilb_group = ilb_group->next;
+
+                } while (ilb_group != sd->groups);
+        }
+
+out_done:
+        return cpumask_first(nohz.cpu_mask);
+}
+#else /*  (CONFIG_SCHED_MC || CONFIG_SCHED_SMT) */
+static inline int find_new_ilb(int call_cpu)
+{
+        return cpumask_first(nohz.cpu_mask);
+}
+#endif
+
 /*
  * This routine will try to nominate the ilb (idle load balancing)
  * owner among the cpus whose ticks are stopped. ilb owner will do the idle
@@ -4298,8 +4572,24 @@ int select_nohz_load_balancer(int stop_tick)
                         /* make me the ilb owner */
                         if (atomic_cmpxchg(&nohz.load_balancer, -1, cpu) == -1)
                                 return 1;
-                } else if (atomic_read(&nohz.load_balancer) == cpu)
+                } else if (atomic_read(&nohz.load_balancer) == cpu) {
+                        int new_ilb;
+
+                        if (!(sched_smt_power_savings ||
+                                                sched_mc_power_savings))
+                                return 1;
+                        /*
+                         * Check to see if there is a more power-efficient
+                         * ilb.
+                         */
+                        new_ilb = find_new_ilb(cpu);
+                        if (new_ilb < nr_cpu_ids && new_ilb != cpu) {
+                                atomic_set(&nohz.load_balancer, -1);
+                                resched_cpu(new_ilb);
+                                return 0;
+                        }
                         return 1;
+                }
         } else {
                 if (!cpumask_test_cpu(cpu, nohz.cpu_mask))
                         return 0;
@@ -4468,15 +4758,7 @@ static inline void trigger_load_balance(struct rq *rq, int cpu)
                 }
 
                 if (atomic_read(&nohz.load_balancer) == -1) {
-                        /*
-                         * simple selection for now: Nominate the
-                         * first cpu in the nohz list to be the next
-                         * ilb owner.
-                         *
-                         * TBD: Traverse the sched domains and nominate
-                         * the nearest cpu in the nohz.cpu_mask.
-                         */
-                        int ilb = cpumask_first(nohz.cpu_mask);
+                        int ilb = find_new_ilb(cpu);
 
                         if (ilb < nr_cpu_ids)
                                 resched_cpu(ilb);
@@ -4840,6 +5122,8 @@ void scheduler_tick(void)
         curr->sched_class->task_tick(rq, curr, 0);
         spin_unlock(&rq->lock);
 
+        perf_counter_task_tick(curr, cpu);
+
 #ifdef CONFIG_SMP
         rq->idle_at_tick = idle_cpu(cpu);
         trigger_load_balance(rq, cpu);
@@ -5007,13 +5291,15 @@ pick_next_task(struct rq *rq)
 /*
  * schedule() is the main scheduler function.
  */
-asmlinkage void __sched __schedule(void)
+asmlinkage void __sched schedule(void)
 {
         struct task_struct *prev, *next;
         unsigned long *switch_count;
         struct rq *rq;
         int cpu;
 
+need_resched:
+        preempt_disable();
         cpu = smp_processor_id();
         rq = cpu_rq(cpu);
         rcu_qsctr_inc(cpu);
@@ -5053,6 +5339,7 @@ need_resched_nonpreemptible:
 
         if (likely(prev != next)) {
                 sched_info_switch(prev, next);
+                perf_counter_task_sched_out(prev, next, cpu);
 
                 rq->nr_switches++;
                 rq->curr = next;
@@ -5070,15 +5357,9 @@ need_resched_nonpreemptible:
 
         if (unlikely(reacquire_kernel_lock(current) < 0))
                 goto need_resched_nonpreemptible;
-}
 
-asmlinkage void __sched schedule(void)
-{
-need_resched:
-        preempt_disable();
-        __schedule();
         preempt_enable_no_resched();
-        if (unlikely(test_thread_flag(TIF_NEED_RESCHED)))
+        if (need_resched())
                 goto need_resched;
 }
 EXPORT_SYMBOL(schedule);
@@ -5221,7 +5502,7 @@ EXPORT_SYMBOL(default_wake_function);
  * started to run but is not in state TASK_RUNNING. try_to_wake_up() returns
  * zero in this (rare) case, and we handle it by continuing to scan the queue.
  */
-void __wake_up_common(wait_queue_head_t *q, unsigned int mode,
+static void __wake_up_common(wait_queue_head_t *q, unsigned int mode,
                         int nr_exclusive, int sync, void *key)
 {
         wait_queue_t *curr, *next;
@@ -5241,6 +5522,9 @@ void __wake_up_common(wait_queue_head_t *q, unsigned int mode,
  * @mode: which threads
  * @nr_exclusive: how many wake-one or wake-many threads to wake up
  * @key: is directly passed to the wakeup function
+ *
+ * It may be assumed that this function implies a write memory barrier before
+ * changing the task state if and only if any tasks are woken up.
  */
 void __wake_up(wait_queue_head_t *q, unsigned int mode,
                         int nr_exclusive, void *key)
@@ -5279,6 +5563,9 @@ void __wake_up_locked_key(wait_queue_head_t *q, unsigned int mode, void *key)
  * with each other. This can prevent needless bouncing between CPUs.
  *
  * On UP it can prevent extra preemption.
+ *
+ * It may be assumed that this function implies a write memory barrier before
+ * changing the task state if and only if any tasks are woken up.
  */
 void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode,
                         int nr_exclusive, void *key)
@@ -5315,6 +5602,9 @@ EXPORT_SYMBOL_GPL(__wake_up_sync);	/* For internal use only */
  * awakened in the same order in which they were queued.
  *
  * See also complete_all(), wait_for_completion() and related routines.
+ *
+ * It may be assumed that this function implies a write memory barrier before
+ * changing the task state if and only if any tasks are woken up.
  */
 void complete(struct completion *x)
 {
@@ -5332,6 +5622,9 @@ EXPORT_SYMBOL(complete);
  * @x:  holds the state of this particular completion
  *
  * This will wake up all threads waiting on this particular completion event.
+ *
+ * It may be assumed that this function implies a write memory barrier before
+ * changing the task state if and only if any tasks are woken up.
  */
 void complete_all(struct completion *x)
 {
@@ -6490,8 +6783,9 @@ void sched_show_task(struct task_struct *p)
 #ifdef CONFIG_DEBUG_STACK_USAGE
         free = stack_not_used(p);
 #endif
-        printk(KERN_CONT "%5lu %5d %6d\n", free,
-                task_pid_nr(p), task_pid_nr(p->real_parent));
+        printk(KERN_CONT "%5lu %5d %6d 0x%08lx\n", free,
+                task_pid_nr(p), task_pid_nr(p->real_parent),
+                (unsigned long)task_thread_info(p)->flags);
 
         show_stack(p, NULL);
 }
@@ -6752,7 +7046,7 @@ static int migration_thread(void *data)
 
                 if (cpu_is_offline(cpu)) {
                         spin_unlock_irq(&rq->lock);
-                        goto wait_to_die;
+                        break;
                 }
 
                 if (rq->active_balance) {
@@ -6778,16 +7072,7 @@ static int migration_thread(void *data)
                 complete(&req->done);
         }
         __set_current_state(TASK_RUNNING);
-        return 0;
 
-wait_to_die:
-        /* Wait for kthread_stop */
-        set_current_state(TASK_INTERRUPTIBLE);
-        while (!kthread_should_stop()) {
-                schedule();
-                set_current_state(TASK_INTERRUPTIBLE);
-        }
-        __set_current_state(TASK_RUNNING);
         return 0;
 }
 
@@ -6970,6 +7255,14 @@ static void migrate_dead_tasks(unsigned int dead_cpu)
 
         }
 }
+
+/*
+ * remove the tasks which were accounted by rq from calc_load_tasks.
+ */
+static void calc_global_load_remove(struct rq *rq)
+{
+        atomic_long_sub(rq->calc_load_active, &calc_load_tasks);
+}
 #endif /* CONFIG_HOTPLUG_CPU */
 
 #if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_SYSCTL)
@@ -7193,6 +7486,7 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 rq = task_rq_lock(p, &flags);
                 __setscheduler(rq, p, SCHED_FIFO, MAX_RT_PRIO-1);
                 task_rq_unlock(rq, &flags);
+                get_task_struct(p);
                 cpu_rq(cpu)->migration_thread = p;
                 break;
 
@@ -7204,6 +7498,8 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 /* Update our root-domain */
                 rq = cpu_rq(cpu);
                 spin_lock_irqsave(&rq->lock, flags);
+                rq->calc_load_update = calc_load_update;
+                rq->calc_load_active = 0;
                 if (rq->rd) {
                         BUG_ON(!cpumask_test_cpu(cpu, rq->rd->span));
 
@@ -7221,6 +7517,7 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 kthread_bind(cpu_rq(cpu)->migration_thread,
                              cpumask_any(cpu_online_mask));
                 kthread_stop(cpu_rq(cpu)->migration_thread);
+                put_task_struct(cpu_rq(cpu)->migration_thread);
                 cpu_rq(cpu)->migration_thread = NULL;
                 break;
 
@@ -7230,6 +7527,7 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 migrate_live_tasks(cpu);
                 rq = cpu_rq(cpu);
                 kthread_stop(rq->migration_thread);
+                put_task_struct(rq->migration_thread);
                 rq->migration_thread = NULL;
                 /* Idle task back to normal (off runqueue, low prio) */
                 spin_lock_irq(&rq->lock);
@@ -7243,7 +7541,7 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 cpuset_unlock();
                 migrate_nr_uninterruptible(rq);
                 BUG_ON(rq->nr_running != 0);
-
+                calc_global_load_remove(rq);
                 /*
                  * No need to migrate the tasks: it was best-effort if
                  * they didn't take sched_hotcpu_mutex. Just wake up
@@ -7279,8 +7577,10 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
         return NOTIFY_OK;
 }
 
-/* Register at highest priority so that task migration (migrate_all_tasks)
- * happens before everything else.
+/*
+ * Register at high priority so that task migration (migrate_all_tasks)
+ * happens before everything else.  This has to be lower priority than
+ * the notifier in the perf_counter subsystem, though.
  */
 static struct notifier_block __cpuinitdata migration_notifier = {
         .notifier_call = migration_call,
@@ -7523,26 +7823,23 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
                 free_rootdomain(old_rd);
 }
 
-static int __init_refok init_rootdomain(struct root_domain *rd, bool bootmem)
+static int init_rootdomain(struct root_domain *rd, bool bootmem)
 {
+        gfp_t gfp = GFP_KERNEL;
+
         memset(rd, 0, sizeof(*rd));
 
-        if (bootmem) {
-                alloc_bootmem_cpumask_var(&def_root_domain.span);
-                alloc_bootmem_cpumask_var(&def_root_domain.online);
-                alloc_bootmem_cpumask_var(&def_root_domain.rto_mask);
-                cpupri_init(&rd->cpupri, true);
-                return 0;
-        }
+        if (bootmem)
+                gfp = GFP_NOWAIT;
 
-        if (!alloc_cpumask_var(&rd->span, GFP_KERNEL))
+        if (!alloc_cpumask_var(&rd->span, gfp))
                 goto out;
-        if (!alloc_cpumask_var(&rd->online, GFP_KERNEL))
+        if (!alloc_cpumask_var(&rd->online, gfp))
                 goto free_span;
-        if (!alloc_cpumask_var(&rd->rto_mask, GFP_KERNEL))
+        if (!alloc_cpumask_var(&rd->rto_mask, gfp))
                 goto free_online;
 
-        if (cpupri_init(&rd->cpupri, false) != 0)
+        if (cpupri_init(&rd->cpupri, bootmem) != 0)
                 goto free_rto_mask;
         return 0;
 
@@ -7753,8 +8050,9 @@ int sched_smt_power_savings = 0, sched_mc_power_savings = 0;
 
 /*
  * The cpus mask in sched_group and sched_domain hangs off the end.
- * FIXME: use cpumask_var_t or dynamic percpu alloc to avoid wasting space
- * for nr_cpu_ids < CONFIG_NR_CPUS.
+ *
+ * ( See the the comments in include/linux/sched.h:struct sched_group
+ *   and struct sched_domain. )
  */
 struct static_sched_group {
         struct sched_group sg;
@@ -7875,7 +8173,7 @@ static void init_numa_sched_groups_power(struct sched_group *group_head)
                         struct sched_domain *sd;
 
                         sd = &per_cpu(phys_domains, j).sd;
-                        if (j != cpumask_first(sched_group_cpus(sd->groups))) {
+                        if (j != group_first_cpu(sd->groups)) {
                                 /*
                                  * Only add "power" once for each
                                  * physical package.
@@ -7953,7 +8251,7 @@ static void init_sched_groups_power(int cpu, struct sched_domain *sd)
 
         WARN_ON(!sd || !sd->groups);
 
-        if (cpu != cpumask_first(sched_group_cpus(sd->groups)))
+        if (cpu != group_first_cpu(sd->groups))
                 return;
 
         child = sd->child;
@@ -8731,6 +9029,8 @@ void __init sched_init_smp(void)
 }
 #endif /* CONFIG_SMP */
 
+const_debug unsigned int sysctl_timer_migration = 1;
+
 int in_sched_functions(unsigned long addr)
 {
         return in_lock_functions(addr) ||
@@ -8865,7 +9165,7 @@ void __init sched_init(void)
          * we use alloc_bootmem().
          */
         if (alloc_size) {
-                ptr = (unsigned long)alloc_bootmem(alloc_size);
+                ptr = (unsigned long)kzalloc(alloc_size, GFP_NOWAIT);
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
                 init_task_group.se = (struct sched_entity **)ptr;
@@ -8938,6 +9238,8 @@ void __init sched_init(void)
                 rq = cpu_rq(i);
                 spin_lock_init(&rq->lock);
                 rq->nr_running = 0;
+                rq->calc_load_active = 0;
+                rq->calc_load_update = jiffies + LOAD_FREQ;
                 init_cfs_rq(&rq->cfs, rq);
                 init_rt_rq(&rq->rt, rq);
 #ifdef CONFIG_FAIR_GROUP_SCHED
@@ -8958,7 +9260,7 @@ void __init sched_init(void)
                  * 1024) and two child groups A0 and A1 (of weight 1024 each),
                  * then A0's share of the cpu resource is:
                  *
-                 *      A0's bandwidth = 1024 / (10*1024 + 1024 + 1024) = 8.33%
+                 *      A0's bandwidth = 1024 / (10*1024 + 1024 + 1024) = 8.33%
                  *
                  * We achieve this by letting init_task_group's tasks sit
                  * directly in rq->cfs (i.e init_task_group->se[] = NULL).
@@ -9045,20 +9347,26 @@ void __init sched_init(void)
          * when this runqueue becomes "idle".
          */
         init_idle(current, smp_processor_id());
+
+        calc_load_update = jiffies + LOAD_FREQ;
+
         /*
          * During early bootup we pretend to be a normal task:
          */
         current->sched_class = &fair_sched_class;
 
         /* Allocate the nohz_cpu_mask if CONFIG_CPUMASK_OFFSTACK */
-        alloc_bootmem_cpumask_var(&nohz_cpu_mask);
+        alloc_cpumask_var(&nohz_cpu_mask, GFP_NOWAIT);
 #ifdef CONFIG_SMP
 #ifdef CONFIG_NO_HZ
-        alloc_bootmem_cpumask_var(&nohz.cpu_mask);
+        alloc_cpumask_var(&nohz.cpu_mask, GFP_NOWAIT);
+        alloc_cpumask_var(&nohz.ilb_grp_nohz_mask, GFP_NOWAIT);
 #endif
-        alloc_bootmem_cpumask_var(&cpu_isolated_map);
+        alloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT);
 #endif /* SMP */
 
+        perf_counter_init();
+
         scheduler_running = 1;
 }
 
@@ -9800,6 +10108,13 @@ static int sched_rt_global_constraints(void)
         if (sysctl_sched_rt_period <= 0)
                 return -EINVAL;
 
+        /*
+         * There's always some RT tasks in the root group
+         * -- migration, kstopmachine etc..
+         */
+        if (sysctl_sched_rt_runtime == 0)
+                return -EBUSY;
+
         spin_lock_irqsave(&def_rt_bandwidth.rt_runtime_lock, flags);
         for_each_possible_cpu(i) {
                 struct rt_rq *rt_rq = &cpu_rq(i)->rt;
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index 819f17ac796e..e1d16c9a7680 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -38,7 +38,8 @@
  */
 unsigned long long __attribute__((weak)) sched_clock(void)
 {
-        return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ);
+        return (unsigned long long)(jiffies - INITIAL_JIFFIES)
+                                        * (NSEC_PER_SEC / HZ);
 }
 
 static __read_mostly int sched_clock_running;
diff --git a/kernel/sched_cpupri.c b/kernel/sched_cpupri.c
index cdd3c89574cd..e6c251790dde 100644
--- a/kernel/sched_cpupri.c
+++ b/kernel/sched_cpupri.c
@@ -152,10 +152,14 @@ void cpupri_set(struct cpupri *cp, int cpu, int newpri)
  *
  * Returns: -ENOMEM if memory fails.
  */
-int __init_refok cpupri_init(struct cpupri *cp, bool bootmem)
+int cpupri_init(struct cpupri *cp, bool bootmem)
 {
+        gfp_t gfp = GFP_KERNEL;
         int i;
 
+        if (bootmem)
+                gfp = GFP_NOWAIT;
+
         memset(cp, 0, sizeof(*cp));
 
         for (i = 0; i < CPUPRI_NR_PRIORITIES; i++) {
@@ -163,9 +167,7 @@ int __init_refok cpupri_init(struct cpupri *cp, bool bootmem)
 
                 spin_lock_init(&vec->lock);
                 vec->count = 0;
-                if (bootmem)
-                        alloc_bootmem_cpumask_var(&vec->mask);
-                else if (!alloc_cpumask_var(&vec->mask, GFP_KERNEL))
+                if (!zalloc_cpumask_var(&vec->mask, gfp))
                         goto cleanup;
         }
 
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 467ca72f1657..70c7e0b79946 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -162,7 +162,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 {
         s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
                 spread, rq0_min_vruntime, spread0;
-        struct rq *rq = &per_cpu(runqueues, cpu);
+        struct rq *rq = cpu_rq(cpu);
         struct sched_entity *last;
         unsigned long flags;
 
@@ -191,7 +191,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
         if (last)
                 max_vruntime = last->vruntime;
         min_vruntime = cfs_rq->min_vruntime;
-        rq0_min_vruntime = per_cpu(runqueues, 0).cfs.min_vruntime;
+        rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
         spin_unlock_irqrestore(&rq->lock, flags);
         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "MIN_vruntime",
                         SPLIT_NS(MIN_vruntime));
@@ -248,7 +248,7 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
 
 static void print_cpu(struct seq_file *m, int cpu)
 {
-        struct rq *rq = &per_cpu(runqueues, cpu);
+        struct rq *rq = cpu_rq(cpu);
 
 #ifdef CONFIG_X86
         {
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 3816f217f119..ba7fd6e9556f 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -430,12 +430,13 @@ static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se)
 
         for_each_sched_entity(se) {
                 struct load_weight *load;
+                struct load_weight lw;
 
                 cfs_rq = cfs_rq_of(se);
                 load = &cfs_rq->load;
 
                 if (unlikely(!se->on_rq)) {
-                        struct load_weight lw = cfs_rq->load;
+                        lw = cfs_rq->load;
 
                         update_load_add(&lw, se->load.weight);
                         load = &lw;
@@ -1487,17 +1488,10 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int sync)
 
         find_matching_se(&se, &pse);
 
-        while (se) {
-                BUG_ON(!pse);
+        BUG_ON(!pse);
 
-                if (wakeup_preempt_entity(se, pse) == 1) {
-                        resched_task(curr);
-                        break;
-                }
-
-                se = parent_entity(se);
-                pse = parent_entity(pse);
-        }
+        if (wakeup_preempt_entity(se, pse) == 1)
+                resched_task(curr);
 }
 
 static struct task_struct *pick_next_task_fair(struct rq *rq)
diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c
index 8a21a2e28c13..499672c10cbd 100644
--- a/kernel/sched_idletask.c
+++ b/kernel/sched_idletask.c
@@ -22,7 +22,8 @@ static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p, int sy
 static struct task_struct *pick_next_task_idle(struct rq *rq)
 {
         schedstat_inc(rq, sched_goidle);
-
+        /* adjust the active tasks as we might go into a long sleep */
+        calc_load_account_active(rq);
         return rq->idle;
 }
 
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index f2c66f8f9712..9bf0d2a73045 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1591,7 +1591,7 @@ static inline void init_sched_rt_class(void)
         unsigned int i;
 
         for_each_possible_cpu(i)
-                alloc_cpumask_var_node(&per_cpu(local_cpu_mask, i),
+                zalloc_cpumask_var_node(&per_cpu(local_cpu_mask, i),
                                         GFP_KERNEL, cpu_to_node(i));
 }
 #endif /* CONFIG_SMP */
diff --git a/kernel/signal.c b/kernel/signal.c
index d8034737db4c..ccf1ceedaebe 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -27,7 +27,7 @@
 #include <linux/freezer.h>
 #include <linux/pid_namespace.h>
 #include <linux/nsproxy.h>
-#include <trace/sched.h>
+#include <trace/events/sched.h>
 
 #include <asm/param.h>
 #include <asm/uaccess.h>
@@ -41,8 +41,6 @@
 
 static struct kmem_cache *sigqueue_cachep;
 
-DEFINE_TRACE(sched_signal_send);
-
 static void __user *sig_handler(struct task_struct *t, int sig)
 {
         return t->sighand->action[sig - 1].sa.sa_handler;
@@ -249,14 +247,19 @@ void flush_sigqueue(struct sigpending *queue)
 /*
  * Flush all pending signals for a task.
  */
+void __flush_signals(struct task_struct *t)
+{
+        clear_tsk_thread_flag(t, TIF_SIGPENDING);
+        flush_sigqueue(&t->pending);
+        flush_sigqueue(&t->signal->shared_pending);
+}
+
 void flush_signals(struct task_struct *t)
 {
         unsigned long flags;
 
         spin_lock_irqsave(&t->sighand->siglock, flags);
-        clear_tsk_thread_flag(t, TIF_SIGPENDING);
-        flush_sigqueue(&t->pending);
-        flush_sigqueue(&t->signal->shared_pending);
+        __flush_signals(t);
         spin_unlock_irqrestore(&t->sighand->siglock, flags);
 }
 
@@ -829,6 +832,7 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
 {
         struct sigpending *pending;
         struct sigqueue *q;
+        int override_rlimit;
 
         trace_sched_signal_send(sig, t);
 
@@ -860,9 +864,13 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
            make sure at least one signal gets delivered and don't
            pass on the info struct.  */
 
-        q = __sigqueue_alloc(t, GFP_ATOMIC, (sig < SIGRTMIN &&
-                                             (is_si_special(info) ||
-                                              info->si_code >= 0)));
+        if (sig < SIGRTMIN)
+                override_rlimit = (is_si_special(info) || info->si_code >= 0);
+        else
+                override_rlimit = 0;
+
+        q = __sigqueue_alloc(t, GFP_ATOMIC | __GFP_NOTRACK_FALSE_POSITIVE,
+                override_rlimit);
         if (q) {
                 list_add_tail(&q->list, &pending->list);
                 switch ((unsigned long) info) {
@@ -1402,7 +1410,7 @@ int do_notify_parent(struct task_struct *tsk, int sig)
         /* do_notify_parent_cldstop should have been called instead.  */
         BUG_ON(task_is_stopped_or_traced(tsk));
 
-        BUG_ON(!tsk->ptrace &&
+        BUG_ON(!task_ptrace(tsk) &&
                (tsk->group_leader != tsk || !thread_group_empty(tsk)));
 
         info.si_signo = sig;
@@ -1441,7 +1449,7 @@ int do_notify_parent(struct task_struct *tsk, int sig)
 
         psig = tsk->parent->sighand;
         spin_lock_irqsave(&psig->siglock, flags);
-        if (!tsk->ptrace && sig == SIGCHLD &&
+        if (!task_ptrace(tsk) && sig == SIGCHLD &&
             (psig->action[SIGCHLD-1].sa.sa_handler == SIG_IGN ||
              (psig->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT))) {
                 /*
@@ -1478,7 +1486,7 @@ static void do_notify_parent_cldstop(struct task_struct *tsk, int why)
         struct task_struct *parent;
         struct sighand_struct *sighand;
 
-        if (tsk->ptrace & PT_PTRACED)
+        if (task_ptrace(tsk))
                 parent = tsk->parent;
         else {
                 tsk = tsk->group_leader;
@@ -1491,7 +1499,7 @@ static void do_notify_parent_cldstop(struct task_struct *tsk, int why)
          * see comment in do_notify_parent() abot the following 3 lines
          */
         rcu_read_lock();
-        info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns);
+        info.si_pid = task_pid_nr_ns(tsk, parent->nsproxy->pid_ns);
         info.si_uid = __task_cred(tsk)->uid;
         rcu_read_unlock();
 
@@ -1527,7 +1535,7 @@ static void do_notify_parent_cldstop(struct task_struct *tsk, int why)
 
 static inline int may_ptrace_stop(void)
 {
-        if (!likely(current->ptrace & PT_PTRACED))
+        if (!likely(task_ptrace(current)))
                 return 0;
         /*
          * Are we in the middle of do_coredump?
@@ -1745,7 +1753,7 @@ static int do_signal_stop(int signr)
 static int ptrace_signal(int signr, siginfo_t *info,
                          struct pt_regs *regs, void *cookie)
 {
-        if (!(current->ptrace & PT_PTRACED))
+        if (!task_ptrace(current))
                 return signr;
 
         ptrace_signal_deliver(regs, cookie);
@@ -2278,24 +2286,17 @@ SYSCALL_DEFINE2(kill, pid_t, pid, int, sig)
         return kill_something_info(sig, &info, pid);
 }
 
-static int do_tkill(pid_t tgid, pid_t pid, int sig)
+static int
+do_send_specific(pid_t tgid, pid_t pid, int sig, struct siginfo *info)
 {
-        int error;
-        struct siginfo info;
         struct task_struct *p;
         unsigned long flags;
-
-        error = -ESRCH;
-        info.si_signo = sig;
-        info.si_errno = 0;
-        info.si_code = SI_TKILL;
-        info.si_pid = task_tgid_vnr(current);
-        info.si_uid = current_uid();
+        int error = -ESRCH;
 
         rcu_read_lock();
         p = find_task_by_vpid(pid);
         if (p && (tgid <= 0 || task_tgid_vnr(p) == tgid)) {
-                error = check_kill_permission(sig, &info, p);
+                error = check_kill_permission(sig, info, p);
                 /*
                  * The null signal is a permissions and process existence
                  * probe.  No signal is actually delivered.
@@ -2305,7 +2306,7 @@ static int do_tkill(pid_t tgid, pid_t pid, int sig)
                  * signal is private anyway.
                  */
                 if (!error && sig && lock_task_sighand(p, &flags)) {
-                        error = specific_send_sig_info(sig, &info, p);
+                        error = specific_send_sig_info(sig, info, p);
                         unlock_task_sighand(p, &flags);
                 }
         }
@@ -2314,6 +2315,19 @@ static int do_tkill(pid_t tgid, pid_t pid, int sig)
         return error;
 }
 
+static int do_tkill(pid_t tgid, pid_t pid, int sig)
+{
+        struct siginfo info;
+
+        info.si_signo = sig;
+        info.si_errno = 0;
+        info.si_code = SI_TKILL;
+        info.si_pid = task_tgid_vnr(current);
+        info.si_uid = current_uid();
+
+        return do_send_specific(tgid, pid, sig, &info);
+}
+
 /**
  *  sys_tgkill - send signal to one specific thread
  *  @tgid: the thread group ID of the thread
@@ -2363,6 +2377,32 @@ SYSCALL_DEFINE3(rt_sigqueueinfo, pid_t, pid, int, sig,
         return kill_proc_info(sig, &info, pid);
 }
 
+long do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig, siginfo_t *info)
+{
+        /* This is only valid for single tasks */
+        if (pid <= 0 || tgid <= 0)
+                return -EINVAL;
+
+        /* Not even root can pretend to send signals from the kernel.
+           Nor can they impersonate a kill(), which adds source info.  */
+        if (info->si_code >= 0)
+                return -EPERM;
+        info->si_signo = sig;
+
+        return do_send_specific(tgid, pid, sig, info);
+}
+
+SYSCALL_DEFINE4(rt_tgsigqueueinfo, pid_t, tgid, pid_t, pid, int, sig,
+                siginfo_t __user *, uinfo)
+{
+        siginfo_t info;
+
+        if (copy_from_user(&info, uinfo, sizeof(siginfo_t)))
+                return -EFAULT;
+
+        return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
+}
+
 int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact)
 {
         struct task_struct *t = current;
diff --git a/kernel/slow-work.c b/kernel/slow-work.c
index b28d19135f43..09d7519557d3 100644
--- a/kernel/slow-work.c
+++ b/kernel/slow-work.c
@@ -319,6 +319,15 @@ cant_get_ref:
 EXPORT_SYMBOL(slow_work_enqueue);
 
 /*
+ * Schedule a cull of the thread pool at some time in the near future
+ */
+static void slow_work_schedule_cull(void)
+{
+        mod_timer(&slow_work_cull_timer,
+                  round_jiffies(jiffies + SLOW_WORK_CULL_TIMEOUT));
+}
+
+/*
  * Worker thread culling algorithm
  */
 static bool slow_work_cull_thread(void)
@@ -335,8 +344,7 @@ static bool slow_work_cull_thread(void)
                     list_empty(&vslow_work_queue) &&
                     atomic_read(&slow_work_thread_count) >
                     slow_work_min_threads) {
-                        mod_timer(&slow_work_cull_timer,
-                                  jiffies + SLOW_WORK_CULL_TIMEOUT);
+                        slow_work_schedule_cull();
                         do_cull = true;
                 }
         }
@@ -372,8 +380,8 @@ static int slow_work_thread(void *_data)
                 vsmax *= atomic_read(&slow_work_thread_count);
                 vsmax /= 100;
 
-                prepare_to_wait(&slow_work_thread_wq, &wait,
-                                TASK_INTERRUPTIBLE);
+                prepare_to_wait_exclusive(&slow_work_thread_wq, &wait,
+                                          TASK_INTERRUPTIBLE);
                 if (!freezing(current) &&
                     !slow_work_threads_should_exit &&
                     !slow_work_available(vsmax) &&
@@ -393,8 +401,7 @@ static int slow_work_thread(void *_data)
                             list_empty(&vslow_work_queue) &&
                             atomic_read(&slow_work_thread_count) >
                             slow_work_min_threads)
-                                mod_timer(&slow_work_cull_timer,
-                                          jiffies + SLOW_WORK_CULL_TIMEOUT);
+                                slow_work_schedule_cull();
                         continue;
                 }
 
@@ -458,7 +465,7 @@ static void slow_work_new_thread_execute(struct slow_work *work)
                 if (atomic_dec_and_test(&slow_work_thread_count))
                         BUG(); /* we're running on a slow work thread... */
                 mod_timer(&slow_work_oom_timer,
-                          jiffies + SLOW_WORK_OOM_TIMEOUT);
+                          round_jiffies(jiffies + SLOW_WORK_OOM_TIMEOUT));
         } else {
                 /* ratelimit the starting of new threads */
                 mod_timer(&slow_work_oom_timer, jiffies + 1);
@@ -502,8 +509,7 @@ static int slow_work_min_threads_sysctl(struct ctl_table *table, int write,
                         if (n < 0 && !slow_work_may_not_start_new_thread)
                                 slow_work_enqueue(&slow_work_new_thread);
                         else if (n > 0)
-                                mod_timer(&slow_work_cull_timer,
-                                          jiffies + SLOW_WORK_CULL_TIMEOUT);
+                                slow_work_schedule_cull();
                 }
                 mutex_unlock(&slow_work_user_lock);
         }
@@ -529,8 +535,7 @@ static int slow_work_max_threads_sysctl(struct ctl_table *table, int write,
                                 atomic_read(&slow_work_thread_count);
 
                         if (n < 0)
-                                mod_timer(&slow_work_cull_timer,
-                                          jiffies + SLOW_WORK_CULL_TIMEOUT);
+                                slow_work_schedule_cull();
                 }
                 mutex_unlock(&slow_work_user_lock);
         }
diff --git a/kernel/smp.c b/kernel/smp.c
index 858baac568ee..ad63d8501207 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -52,7 +52,7 @@ hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
         switch (action) {
         case CPU_UP_PREPARE:
         case CPU_UP_PREPARE_FROZEN:
-                if (!alloc_cpumask_var_node(&cfd->cpumask, GFP_KERNEL,
+                if (!zalloc_cpumask_var_node(&cfd->cpumask, GFP_KERNEL,
                                 cpu_to_node(cpu)))
                         return NOTIFY_BAD;
                 break;
diff --git a/kernel/softirq.c b/kernel/softirq.c
index b525dd348511..3a94905fa5d2 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -24,7 +24,9 @@
 #include <linux/ftrace.h>
 #include <linux/smp.h>
 #include <linux/tick.h>
-#include <trace/irq.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/irq.h>
 
 #include <asm/irq.h>
 /*
@@ -186,9 +188,6 @@ EXPORT_SYMBOL(local_bh_enable_ip);
  */
 #define MAX_SOFTIRQ_RESTART 10
 
-DEFINE_TRACE(softirq_entry);
-DEFINE_TRACE(softirq_exit);
-
 asmlinkage void __do_softirq(void)
 {
         struct softirq_action *h;
@@ -214,6 +213,7 @@ restart:
         do {
                 if (pending & 1) {
                         int prev_count = preempt_count();
+                        kstat_incr_softirqs_this_cpu(h - softirq_vec);
 
                         trace_softirq_entry(h, softirq_vec);
                         h->action(h);
@@ -383,6 +383,17 @@ void __tasklet_hi_schedule(struct tasklet_struct *t)
 
 EXPORT_SYMBOL(__tasklet_hi_schedule);
 
+void __tasklet_hi_schedule_first(struct tasklet_struct *t)
+{
+        BUG_ON(!irqs_disabled());
+
+        t->next = __get_cpu_var(tasklet_hi_vec).head;
+        __get_cpu_var(tasklet_hi_vec).head = t;
+        __raise_softirq_irqoff(HI_SOFTIRQ);
+}
+
+EXPORT_SYMBOL(__tasklet_hi_schedule_first);
+
 static void tasklet_action(struct softirq_action *a)
 {
         struct tasklet_struct *list;
@@ -828,7 +839,7 @@ int __init __weak arch_early_irq_init(void)
         return 0;
 }
 
-int __weak arch_init_chip_data(struct irq_desc *desc, int cpu)
+int __weak arch_init_chip_data(struct irq_desc *desc, int node)
 {
         return 0;
 }
diff --git a/kernel/sys.c b/kernel/sys.c
index e7998cf31498..b3f1097c76fa 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -14,6 +14,7 @@
 #include <linux/prctl.h>
 #include <linux/highuid.h>
 #include <linux/fs.h>
+#include <linux/perf_counter.h>
 #include <linux/resource.h>
 #include <linux/kernel.h>
 #include <linux/kexec.h>
@@ -1112,289 +1113,6 @@ out:
         return err;
 }
 
-/*
- * Supplementary group IDs
- */
-
-/* init to 2 - one for init_task, one to ensure it is never freed */
-struct group_info init_groups = { .usage = ATOMIC_INIT(2) };
-
-struct group_info *groups_alloc(int gidsetsize)
-{
-        struct group_info *group_info;
-        int nblocks;
-        int i;
-
-        nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK;
-        /* Make sure we always allocate at least one indirect block pointer */
-        nblocks = nblocks ? : 1;
-        group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER);
-        if (!group_info)
-                return NULL;
-        group_info->ngroups = gidsetsize;
-        group_info->nblocks = nblocks;
-        atomic_set(&group_info->usage, 1);
-
-        if (gidsetsize <= NGROUPS_SMALL)
-                group_info->blocks[0] = group_info->small_block;
-        else {
-                for (i = 0; i < nblocks; i++) {
-                        gid_t *b;
-                        b = (void *)__get_free_page(GFP_USER);
-                        if (!b)
-                                goto out_undo_partial_alloc;
-                        group_info->blocks[i] = b;
-                }
-        }
-        return group_info;
-
-out_undo_partial_alloc:
-        while (--i >= 0) {
-                free_page((unsigned long)group_info->blocks[i]);
-        }
-        kfree(group_info);
-        return NULL;
-}
-
-EXPORT_SYMBOL(groups_alloc);
-
-void groups_free(struct group_info *group_info)
-{
-        if (group_info->blocks[0] != group_info->small_block) {
-                int i;
-                for (i = 0; i < group_info->nblocks; i++)
-                        free_page((unsigned long)group_info->blocks[i]);
-        }
-        kfree(group_info);
-}
-
-EXPORT_SYMBOL(groups_free);
-
-/* export the group_info to a user-space array */
-static int groups_to_user(gid_t __user *grouplist,
-                          const struct group_info *group_info)
-{
-        int i;
-        unsigned int count = group_info->ngroups;
-
-        for (i = 0; i < group_info->nblocks; i++) {
-                unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);
-                unsigned int len = cp_count * sizeof(*grouplist);
-
-                if (copy_to_user(grouplist, group_info->blocks[i], len))
-                        return -EFAULT;
-
-                grouplist += NGROUPS_PER_BLOCK;
-                count -= cp_count;
-        }
-        return 0;
-}
-
-/* fill a group_info from a user-space array - it must be allocated already */
-static int groups_from_user(struct group_info *group_info,
-    gid_t __user *grouplist)
-{
-        int i;
-        unsigned int count = group_info->ngroups;
-
-        for (i = 0; i < group_info->nblocks; i++) {
-                unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);
-                unsigned int len = cp_count * sizeof(*grouplist);
-
-                if (copy_from_user(group_info->blocks[i], grouplist, len))
-                        return -EFAULT;
-
-                grouplist += NGROUPS_PER_BLOCK;
-                count -= cp_count;
-        }
-        return 0;
-}
-
-/* a simple Shell sort */
-static void groups_sort(struct group_info *group_info)
-{
-        int base, max, stride;
-        int gidsetsize = group_info->ngroups;
-
-        for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1)
-                ; /* nothing */
-        stride /= 3;
-
-        while (stride) {
-                max = gidsetsize - stride;
-                for (base = 0; base < max; base++) {
-                        int left = base;
-                        int right = left + stride;
-                        gid_t tmp = GROUP_AT(group_info, right);
-
-                        while (left >= 0 && GROUP_AT(group_info, left) > tmp) {
-                                GROUP_AT(group_info, right) =
-                                    GROUP_AT(group_info, left);
-                                right = left;
-                                left -= stride;
-                        }
-                        GROUP_AT(group_info, right) = tmp;
-                }
-                stride /= 3;
-        }
-}
-
-/* a simple bsearch */
-int groups_search(const struct group_info *group_info, gid_t grp)
-{
-        unsigned int left, right;
-
-        if (!group_info)
-                return 0;
-
-        left = 0;
-        right = group_info->ngroups;
-        while (left < right) {
-                unsigned int mid = (left+right)/2;
-                int cmp = grp - GROUP_AT(group_info, mid);
-                if (cmp > 0)
-                        left = mid + 1;
-                else if (cmp < 0)
-                        right = mid;
-                else
-                        return 1;
-        }
-        return 0;
-}
-
-/**
- * set_groups - Change a group subscription in a set of credentials
- * @new: The newly prepared set of credentials to alter
- * @group_info: The group list to install
- *
- * Validate a group subscription and, if valid, insert it into a set
- * of credentials.
- */
-int set_groups(struct cred *new, struct group_info *group_info)
-{
-        int retval;
-
-        retval = security_task_setgroups(group_info);
-        if (retval)
-                return retval;
-
-        put_group_info(new->group_info);
-        groups_sort(group_info);
-        get_group_info(group_info);
-        new->group_info = group_info;
-        return 0;
-}
-
-EXPORT_SYMBOL(set_groups);
-
-/**
- * set_current_groups - Change current's group subscription
- * @group_info: The group list to impose
- *
- * Validate a group subscription and, if valid, impose it upon current's task
- * security record.
- */
-int set_current_groups(struct group_info *group_info)
-{
-        struct cred *new;
-        int ret;
-
-        new = prepare_creds();
-        if (!new)
-                return -ENOMEM;
-
-        ret = set_groups(new, group_info);
-        if (ret < 0) {
-                abort_creds(new);
-                return ret;
-        }
-
-        return commit_creds(new);
-}
-
-EXPORT_SYMBOL(set_current_groups);
-
-SYSCALL_DEFINE2(getgroups, int, gidsetsize, gid_t __user *, grouplist)
-{
-        const struct cred *cred = current_cred();
-        int i;
-
-        if (gidsetsize < 0)
-                return -EINVAL;
-
-        /* no need to grab task_lock here; it cannot change */
-        i = cred->group_info->ngroups;
-        if (gidsetsize) {
-                if (i > gidsetsize) {
-                        i = -EINVAL;
-                        goto out;
-                }
-                if (groups_to_user(grouplist, cred->group_info)) {
-                        i = -EFAULT;
-                        goto out;
-                }
-        }
-out:
-        return i;
-}
-
-/*
- *      SMP: Our groups are copy-on-write. We can set them safely
- *      without another task interfering.
- */
- 
-SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, grouplist)
-{
-        struct group_info *group_info;
-        int retval;
-
-        if (!capable(CAP_SETGID))
-                return -EPERM;
-        if ((unsigned)gidsetsize > NGROUPS_MAX)
-                return -EINVAL;
-
-        group_info = groups_alloc(gidsetsize);
-        if (!group_info)
-                return -ENOMEM;
-        retval = groups_from_user(group_info, grouplist);
-        if (retval) {
-                put_group_info(group_info);
-                return retval;
-        }
-
-        retval = set_current_groups(group_info);
-        put_group_info(group_info);
-
-        return retval;
-}
-
-/*
- * Check whether we're fsgid/egid or in the supplemental group..
- */
-int in_group_p(gid_t grp)
-{
-        const struct cred *cred = current_cred();
-        int retval = 1;
-
-        if (grp != cred->fsgid)
-                retval = groups_search(cred->group_info, grp);
-        return retval;
-}
-
-EXPORT_SYMBOL(in_group_p);
-
-int in_egroup_p(gid_t grp)
-{
-        const struct cred *cred = current_cred();
-        int retval = 1;
-
-        if (grp != cred->egid)
-                retval = groups_search(cred->group_info, grp);
-        return retval;
-}
-
-EXPORT_SYMBOL(in_egroup_p);
-
 DECLARE_RWSEM(uts_sem);
 
 SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name)
@@ -1793,6 +1511,12 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
                 case PR_SET_TSC:
                         error = SET_TSC_CTL(arg2);
                         break;
+                case PR_TASK_PERF_COUNTERS_DISABLE:
+                        error = perf_counter_task_disable();
+                        break;
+                case PR_TASK_PERF_COUNTERS_ENABLE:
+                        error = perf_counter_task_enable();
+                        break;
                 case PR_GET_TIMERSLACK:
                         error = current->timer_slack_ns;
                         break;
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 27dad2967387..68320f6b07b5 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -175,3 +175,6 @@ cond_syscall(compat_sys_timerfd_settime);
 cond_syscall(compat_sys_timerfd_gettime);
 cond_syscall(sys_eventfd);
 cond_syscall(sys_eventfd2);
+
+/* performance counters: */
+cond_syscall(sys_perf_counter_open);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index ea78fa101ad6..62e4ff9968b5 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -27,6 +27,7 @@
 #include <linux/security.h>
 #include <linux/ctype.h>
 #include <linux/utsname.h>
+#include <linux/kmemcheck.h>
 #include <linux/smp_lock.h>
 #include <linux/fs.h>
 #include <linux/init.h>
@@ -49,6 +50,7 @@
 #include <linux/reboot.h>
 #include <linux/ftrace.h>
 #include <linux/slow-work.h>
+#include <linux/perf_counter.h>
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
@@ -101,7 +103,6 @@ static int __maybe_unused one = 1;
 static int __maybe_unused two = 2;
 static unsigned long one_ul = 1;
 static int one_hundred = 100;
-static int one_thousand = 1000;
 
 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
@@ -115,6 +116,7 @@ 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;
@@ -327,6 +329,14 @@ static struct ctl_table kern_table[] = {
                 .mode           = 0644,
                 .proc_handler   = &proc_dointvec,
         },
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "timer_migration",
+                .data           = &sysctl_timer_migration,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
 #endif
         {
                 .ctl_name       = CTL_UNNUMBERED,
@@ -535,6 +545,17 @@ static struct ctl_table kern_table[] = {
                 .proc_handler   = &proc_dostring,
                 .strategy       = &sysctl_string,
         },
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "modules_disabled",
+                .data           = &modules_disabled,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                /* only handle a transition from default "0" to "1" */
+                .proc_handler   = &proc_dointvec_minmax,
+                .extra1         = &one,
+                .extra2         = &one,
+        },
 #endif
 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
         {
@@ -732,6 +753,14 @@ static struct ctl_table kern_table[] = {
         },
         {
                 .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "bootloader_version",
+                .data           = &bootloader_version,
+                .maxlen         = sizeof (int),
+                .mode           = 0444,
+                .proc_handler   = &proc_dointvec,
+        },
+        {
+                .ctl_name       = CTL_UNNUMBERED,
                 .procname       = "kstack_depth_to_print",
                 .data           = &kstack_depth_to_print,
                 .maxlen         = sizeof(int),
@@ -913,6 +942,43 @@ static struct ctl_table kern_table[] = {
                 .child          = slow_work_sysctls,
         },
 #endif
+#ifdef CONFIG_PERF_COUNTERS
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "perf_counter_paranoid",
+                .data           = &sysctl_perf_counter_paranoid,
+                .maxlen         = sizeof(sysctl_perf_counter_paranoid),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "perf_counter_mlock_kb",
+                .data           = &sysctl_perf_counter_mlock,
+                .maxlen         = sizeof(sysctl_perf_counter_mlock),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "perf_counter_max_sample_rate",
+                .data           = &sysctl_perf_counter_sample_rate,
+                .maxlen         = sizeof(sysctl_perf_counter_sample_rate),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
+#endif
+#ifdef CONFIG_KMEMCHECK
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "kmemcheck",
+                .data           = &kmemcheck_enabled,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
+#endif
+
 /*
  * NOTE: do not add new entries to this table unless you have read
  * Documentation/sysctl/ctl_unnumbered.txt
@@ -1034,28 +1100,6 @@ static struct ctl_table vm_table[] = {
                 .proc_handler   = &proc_dointvec,
         },
         {
-                .ctl_name       = CTL_UNNUMBERED,
-                .procname       = "nr_pdflush_threads_min",
-                .data           = &nr_pdflush_threads_min,
-                .maxlen         = sizeof nr_pdflush_threads_min,
-                .mode           = 0644 /* read-write */,
-                .proc_handler   = &proc_dointvec_minmax,
-                .strategy       = &sysctl_intvec,
-                .extra1         = &one,
-                .extra2         = &nr_pdflush_threads_max,
-        },
-        {
-                .ctl_name       = CTL_UNNUMBERED,
-                .procname       = "nr_pdflush_threads_max",
-                .data           = &nr_pdflush_threads_max,
-                .maxlen         = sizeof nr_pdflush_threads_max,
-                .mode           = 0644 /* read-write */,
-                .proc_handler   = &proc_dointvec_minmax,
-                .strategy       = &sysctl_intvec,
-                .extra1         = &nr_pdflush_threads_min,
-                .extra2         = &one_thousand,
-        },
-        {
                 .ctl_name       = VM_SWAPPINESS,
                 .procname       = "swappiness",
                 .data           = &vm_swappiness,
@@ -1248,7 +1292,6 @@ static struct ctl_table vm_table[] = {
                 .strategy       = &sysctl_jiffies,
         },
 #endif
-#ifdef CONFIG_SECURITY
         {
                 .ctl_name       = CTL_UNNUMBERED,
                 .procname       = "mmap_min_addr",
@@ -1257,7 +1300,6 @@ static struct ctl_table vm_table[] = {
                 .mode           = 0644,
                 .proc_handler   = &proc_doulongvec_minmax,
         },
-#endif
 #ifdef CONFIG_NUMA
         {
                 .ctl_name       = CTL_UNNUMBERED,
@@ -1295,7 +1337,6 @@ static struct ctl_table vm_table[] = {
                 .extra2         = &one,
         },
 #endif
-#ifdef CONFIG_UNEVICTABLE_LRU
         {
                 .ctl_name       = CTL_UNNUMBERED,
                 .procname       = "scan_unevictable_pages",
@@ -1304,7 +1345,6 @@ static struct ctl_table vm_table[] = {
                 .mode           = 0644,
                 .proc_handler   = &scan_unevictable_handler,
         },
-#endif
 /*
  * NOTE: do not add new entries to this table unless you have read
  * Documentation/sysctl/ctl_unnumbered.txt
@@ -2243,7 +2283,7 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
                   void *data)
 {
 #define TMPBUFLEN 21
-        int *i, vleft, first=1, neg, val;
+        int *i, vleft, first = 1, neg;
         unsigned long lval;
         size_t left, len;
         
@@ -2296,8 +2336,6 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
                         len = p-buf;
                         if ((len < left) && *p && !isspace(*p))
                                 break;
-                        if (neg)
-                                val = -val;
                         s += len;
                         left -= len;
 
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index d13be216a790..1ad6dd461119 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -18,6 +18,7 @@
 #include <linux/notifier.h>
 #include <linux/smp.h>
 #include <linux/sysdev.h>
+#include <linux/tick.h>
 
 /* The registered clock event devices */
 static LIST_HEAD(clockevent_devices);
@@ -54,6 +55,7 @@ unsigned long clockevent_delta2ns(unsigned long latch,
 
         return (unsigned long) clc;
 }
+EXPORT_SYMBOL_GPL(clockevent_delta2ns);
 
 /**
  * clockevents_set_mode - set the operating mode of a clock event device
@@ -187,6 +189,7 @@ void clockevents_register_device(struct clock_event_device *dev)
 
         spin_unlock(&clockevents_lock);
 }
+EXPORT_SYMBOL_GPL(clockevents_register_device);
 
 /*
  * Noop handler when we shut down an event device
@@ -251,4 +254,15 @@ void clockevents_notify(unsigned long reason, void *arg)
         spin_unlock(&clockevents_lock);
 }
 EXPORT_SYMBOL_GPL(clockevents_notify);
+
+ktime_t clockevents_get_next_event(int cpu)
+{
+        struct tick_device *td;
+        struct clock_event_device *dev;
+
+        td = &per_cpu(tick_cpu_device, cpu);
+        dev = td->evtdev;
+
+        return dev->next_event;
+}
 #endif
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index ecfd7b5187e0..592bf584d1d2 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -402,9 +402,6 @@ int clocksource_register(struct clocksource *c)
         unsigned long flags;
         int ret;
 
-        /* save mult_orig on registration */
-        c->mult_orig = c->mult;
-
         spin_lock_irqsave(&clocksource_lock, flags);
         ret = clocksource_enqueue(c);
         if (!ret)
@@ -512,6 +509,18 @@ static ssize_t sysfs_override_clocksource(struct sys_device *dev,
                 }
         }
 
+        /*
+         * Check to make sure we don't switch to a non-highres capable
+         * clocksource if the tick code is in oneshot mode (highres or nohz)
+         */
+        if (tick_oneshot_mode_active() &&
+            !(ovr->flags & CLOCK_SOURCE_VALID_FOR_HRES)) {
+                printk(KERN_WARNING "%s clocksource is not HRT compatible. "
+                        "Cannot switch while in HRT/NOHZ mode\n", ovr->name);
+                ovr = NULL;
+                override_name[0] = 0;
+        }
+
         /* Reselect, when the override name has changed */
         if (ovr != clocksource_override) {
                 clocksource_override = ovr;
@@ -540,7 +549,13 @@ sysfs_show_available_clocksources(struct sys_device *dev,
 
         spin_lock_irq(&clocksource_lock);
         list_for_each_entry(src, &clocksource_list, list) {
-                count += snprintf(buf + count,
+                /*
+                 * Don't show non-HRES clocksource if the tick code is
+                 * in one shot mode (highres=on or nohz=on)
+                 */
+                if (!tick_oneshot_mode_active() ||
+                    (src->flags & CLOCK_SOURCE_VALID_FOR_HRES))
+                        count += snprintf(buf + count,
                                   max((ssize_t)PAGE_SIZE - count, (ssize_t)0),
                                   "%s ", src->name);
         }
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 118a3b3b3f9a..877dbedc3118 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -27,7 +27,7 @@
  * timer stops in C3 state.
  */
 
-struct tick_device tick_broadcast_device;
+static struct tick_device tick_broadcast_device;
 /* FIXME: Use cpumask_var_t. */
 static DECLARE_BITMAP(tick_broadcast_mask, NR_CPUS);
 static DECLARE_BITMAP(tmpmask, NR_CPUS);
diff --git a/kernel/time/tick-oneshot.c b/kernel/time/tick-oneshot.c
index 2e8de678e767..a96c0e2b89cf 100644
--- a/kernel/time/tick-oneshot.c
+++ b/kernel/time/tick-oneshot.c
@@ -128,6 +128,23 @@ int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *))
         return 0;
 }
 
+/**
+ * tick_check_oneshot_mode - check whether the system is in oneshot mode
+ *
+ * returns 1 when either nohz or highres are enabled. otherwise 0.
+ */
+int tick_oneshot_mode_active(void)
+{
+        unsigned long flags;
+        int ret;
+
+        local_irq_save(flags);
+        ret = __get_cpu_var(tick_cpu_device).mode == TICKDEV_MODE_ONESHOT;
+        local_irq_restore(flags);
+
+        return ret;
+}
+
 #ifdef CONFIG_HIGH_RES_TIMERS
 /**
  * tick_init_highres - switch to high resolution mode
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index d3f1ef4d5cbe..e0f59a21c061 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -222,6 +222,15 @@ void tick_nohz_stop_sched_tick(int inidle)
 
         cpu = smp_processor_id();
         ts = &per_cpu(tick_cpu_sched, cpu);
+
+        /*
+         * Call to tick_nohz_start_idle stops the last_update_time from being
+         * updated. Thus, it must not be called in the event we are called from
+         * irq_exit() with the prior state different than idle.
+         */
+        if (!inidle && !ts->inidle)
+                goto end;
+
         now = tick_nohz_start_idle(ts);
 
         /*
@@ -239,9 +248,6 @@ void tick_nohz_stop_sched_tick(int inidle)
         if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE))
                 goto end;
 
-        if (!inidle && !ts->inidle)
-                goto end;
-
         ts->inidle = 1;
 
         if (need_resched())
@@ -349,7 +355,7 @@ void tick_nohz_stop_sched_tick(int inidle)
 
                 if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
                         hrtimer_start(&ts->sched_timer, expires,
-                                      HRTIMER_MODE_ABS);
+                                      HRTIMER_MODE_ABS_PINNED);
                         /* Check, if the timer was already in the past */
                         if (hrtimer_active(&ts->sched_timer))
                                 goto out;
@@ -395,7 +401,7 @@ static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)
 
                 if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
                         hrtimer_start_expires(&ts->sched_timer,
-                                      HRTIMER_MODE_ABS);
+                                              HRTIMER_MODE_ABS_PINNED);
                         /* Check, if the timer was already in the past */
                         if (hrtimer_active(&ts->sched_timer))
                                 break;
@@ -698,7 +704,8 @@ void tick_setup_sched_timer(void)
 
         for (;;) {
                 hrtimer_forward(&ts->sched_timer, now, tick_period);
-                hrtimer_start_expires(&ts->sched_timer, HRTIMER_MODE_ABS);
+                hrtimer_start_expires(&ts->sched_timer,
+                                      HRTIMER_MODE_ABS_PINNED);
                 /* Check, if the timer was already in the past */
                 if (hrtimer_active(&ts->sched_timer))
                         break;
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 687dff49f6e7..e8c77d9c633a 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -22,7 +22,7 @@
 
 /*
  * This read-write spinlock protects us from races in SMP while
- * playing with xtime and avenrun.
+ * playing with xtime.
  */
 __cacheline_aligned_in_smp DEFINE_SEQLOCK(xtime_lock);
 
@@ -77,6 +77,10 @@ static void clocksource_forward_now(void)
         clock->cycle_last = cycle_now;
 
         nsec = cyc2ns(clock, cycle_delta);
+
+        /* If arch requires, add in gettimeoffset() */
+        nsec += arch_gettimeoffset();
+
         timespec_add_ns(&xtime, nsec);
 
         nsec = ((s64)cycle_delta * clock->mult_orig) >> clock->shift;
@@ -111,6 +115,9 @@ void getnstimeofday(struct timespec *ts)
                 /* convert to nanoseconds: */
                 nsecs = cyc2ns(clock, cycle_delta);
 
+                /* If arch requires, add in gettimeoffset() */
+                nsecs += arch_gettimeoffset();
+
         } while (read_seqretry(&xtime_lock, seq));
 
         timespec_add_ns(ts, nsecs);
diff --git a/kernel/timer.c b/kernel/timer.c
index cffffad01c31..54d3912f8cad 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -37,6 +37,8 @@
 #include <linux/delay.h>
 #include <linux/tick.h>
 #include <linux/kallsyms.h>
+#include <linux/perf_counter.h>
+#include <linux/sched.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -604,13 +606,12 @@ static struct tvec_base *lock_timer_base(struct timer_list *timer,
 }
 
 static inline int
-__mod_timer(struct timer_list *timer, unsigned long expires, bool pending_only)
+__mod_timer(struct timer_list *timer, unsigned long expires,
+                                                bool pending_only, int pinned)
 {
         struct tvec_base *base, *new_base;
         unsigned long flags;
-        int ret;
-
-        ret = 0;
+        int ret = 0 , cpu;
 
         timer_stats_timer_set_start_info(timer);
         BUG_ON(!timer->function);
@@ -629,6 +630,18 @@ __mod_timer(struct timer_list *timer, unsigned long expires, bool pending_only)
 
         new_base = __get_cpu_var(tvec_bases);
 
+        cpu = smp_processor_id();
+
+#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
+        if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu)) {
+                int preferred_cpu = get_nohz_load_balancer();
+
+                if (preferred_cpu >= 0)
+                        cpu = preferred_cpu;
+        }
+#endif
+        new_base = per_cpu(tvec_bases, cpu);
+
         if (base != new_base) {
                 /*
                  * We are trying to schedule the timer on the local CPU.
@@ -668,7 +681,7 @@ out_unlock:
  */
 int mod_timer_pending(struct timer_list *timer, unsigned long expires)
 {
-        return __mod_timer(timer, expires, true);
+        return __mod_timer(timer, expires, true, TIMER_NOT_PINNED);
 }
 EXPORT_SYMBOL(mod_timer_pending);
 
@@ -702,11 +715,33 @@ int mod_timer(struct timer_list *timer, unsigned long expires)
         if (timer->expires == expires && timer_pending(timer))
                 return 1;
 
-        return __mod_timer(timer, expires, false);
+        return __mod_timer(timer, expires, false, TIMER_NOT_PINNED);
 }
 EXPORT_SYMBOL(mod_timer);
 
 /**
+ * mod_timer_pinned - modify a timer's timeout
+ * @timer: the timer to be modified
+ * @expires: new timeout in jiffies
+ *
+ * mod_timer_pinned() is a way to update the expire field of an
+ * active timer (if the timer is inactive it will be activated)
+ * and not allow the timer to be migrated to a different CPU.
+ *
+ * mod_timer_pinned(timer, expires) is equivalent to:
+ *
+ *     del_timer(timer); timer->expires = expires; add_timer(timer);
+ */
+int mod_timer_pinned(struct timer_list *timer, unsigned long expires)
+{
+        if (timer->expires == expires && timer_pending(timer))
+                return 1;
+
+        return __mod_timer(timer, expires, false, TIMER_PINNED);
+}
+EXPORT_SYMBOL(mod_timer_pinned);
+
+/**
  * add_timer - start a timer
  * @timer: the timer to be added
  *
@@ -756,6 +791,7 @@ void add_timer_on(struct timer_list *timer, int cpu)
         wake_up_idle_cpu(cpu);
         spin_unlock_irqrestore(&base->lock, flags);
 }
+EXPORT_SYMBOL_GPL(add_timer_on);
 
 /**
  * del_timer - deactive a timer.
@@ -1015,6 +1051,9 @@ cascade:
                 index = slot = timer_jiffies & TVN_MASK;
                 do {
                         list_for_each_entry(nte, varp->vec + slot, entry) {
+                                if (tbase_get_deferrable(nte->base))
+                                        continue;
+
                                 found = 1;
                                 if (time_before(nte->expires, expires))
                                         expires = nte->expires;
@@ -1123,53 +1162,14 @@ void update_process_times(int user_tick)
 }
 
 /*
- * Nr of active tasks - counted in fixed-point numbers
- */
-static unsigned long count_active_tasks(void)
-{
-        return nr_active() * FIXED_1;
-}
-
-/*
- * Hmm.. Changed this, as the GNU make sources (load.c) seems to
- * imply that avenrun[] is the standard name for this kind of thing.
- * Nothing else seems to be standardized: the fractional size etc
- * all seem to differ on different machines.
- *
- * Requires xtime_lock to access.
- */
-unsigned long avenrun[3];
-
-EXPORT_SYMBOL(avenrun);
-
-/*
- * calc_load - given tick count, update the avenrun load estimates.
- * This is called while holding a write_lock on xtime_lock.
- */
-static inline void calc_load(unsigned long ticks)
-{
-        unsigned long active_tasks; /* fixed-point */
-        static int count = LOAD_FREQ;
-
-        count -= ticks;
-        if (unlikely(count < 0)) {
-                active_tasks = count_active_tasks();
-                do {
-                        CALC_LOAD(avenrun[0], EXP_1, active_tasks);
-                        CALC_LOAD(avenrun[1], EXP_5, active_tasks);
-                        CALC_LOAD(avenrun[2], EXP_15, active_tasks);
-                        count += LOAD_FREQ;
-                } while (count < 0);
-        }
-}
-
-/*
  * This function runs timers and the timer-tq in bottom half context.
  */
 static void run_timer_softirq(struct softirq_action *h)
 {
         struct tvec_base *base = __get_cpu_var(tvec_bases);
 
+        perf_counter_do_pending();
+
         hrtimer_run_pending();
 
         if (time_after_eq(jiffies, base->timer_jiffies))
@@ -1187,16 +1187,6 @@ void run_local_timers(void)
 }
 
 /*
- * Called by the timer interrupt. xtime_lock must already be taken
- * by the timer IRQ!
- */
-static inline void update_times(unsigned long ticks)
-{
-        update_wall_time();
-        calc_load(ticks);
-}
-
-/*
  * The 64-bit jiffies value is not atomic - you MUST NOT read it
  * without sampling the sequence number in xtime_lock.
  * jiffies is defined in the linker script...
@@ -1205,7 +1195,8 @@ static inline void update_times(unsigned long ticks)
 void do_timer(unsigned long ticks)
 {
         jiffies_64 += ticks;
-        update_times(ticks);
+        update_wall_time();
+        calc_global_load();
 }
 
 #ifdef __ARCH_WANT_SYS_ALARM
@@ -1353,7 +1344,7 @@ signed long __sched schedule_timeout(signed long timeout)
         expire = timeout + jiffies;
 
         setup_timer_on_stack(&timer, process_timeout, (unsigned long)current);
-        __mod_timer(&timer, expire, false);
+        __mod_timer(&timer, expire, false, TIMER_NOT_PINNED);
         schedule();
         del_singleshot_timer_sync(&timer);
 
@@ -1406,37 +1397,17 @@ int do_sysinfo(struct sysinfo *info)
 {
         unsigned long mem_total, sav_total;
         unsigned int mem_unit, bitcount;
-        unsigned long seq;
+        struct timespec tp;
 
         memset(info, 0, sizeof(struct sysinfo));
 
-        do {
-                struct timespec tp;
-                seq = read_seqbegin(&xtime_lock);
-
-                /*
-                 * This is annoying.  The below is the same thing
-                 * posix_get_clock_monotonic() does, but it wants to
-                 * take the lock which we want to cover the loads stuff
-                 * too.
-                 */
-
-                getnstimeofday(&tp);
-                tp.tv_sec += wall_to_monotonic.tv_sec;
-                tp.tv_nsec += wall_to_monotonic.tv_nsec;
-                monotonic_to_bootbased(&tp);
-                if (tp.tv_nsec - NSEC_PER_SEC >= 0) {
-                        tp.tv_nsec = tp.tv_nsec - NSEC_PER_SEC;
-                        tp.tv_sec++;
-                }
-                info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
+        ktime_get_ts(&tp);
+        monotonic_to_bootbased(&tp);
+        info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
 
-                info->loads[0] = avenrun[0] << (SI_LOAD_SHIFT - FSHIFT);
-                info->loads[1] = avenrun[1] << (SI_LOAD_SHIFT - FSHIFT);
-                info->loads[2] = avenrun[2] << (SI_LOAD_SHIFT - FSHIFT);
+        get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT);
 
-                info->procs = nr_threads;
-        } while (read_seqretry(&xtime_lock, seq));
+        info->procs = nr_threads;
 
         si_meminfo(info);
         si_swapinfo(info);
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 417d1985e299..1551f47e7669 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -18,6 +18,13 @@ config HAVE_FUNCTION_TRACER
 config HAVE_FUNCTION_GRAPH_TRACER
         bool
 
+config HAVE_FUNCTION_GRAPH_FP_TEST
+        bool
+        help
+         An arch may pass in a unique value (frame pointer) to both the
+         entering and exiting of a function. On exit, the value is compared
+         and if it does not match, then it will panic the kernel.
+
 config HAVE_FUNCTION_TRACE_MCOUNT_TEST
         bool
         help
@@ -48,6 +55,21 @@ config FTRACE_NMI_ENTER
        depends on HAVE_FTRACE_NMI_ENTER
        default y
 
+config EVENT_TRACING
+        select CONTEXT_SWITCH_TRACER
+        bool
+
+config CONTEXT_SWITCH_TRACER
+        select MARKERS
+        bool
+
+# All tracer options should select GENERIC_TRACER. For those options that are
+# enabled by all tracers (context switch and event tracer) they select TRACING.
+# This allows those options to appear when no other tracer is selected. But the
+# options do not appear when something else selects it. We need the two options
+# GENERIC_TRACER and TRACING to avoid circular dependencies to accomplish the
+# hidding of the automatic options options.
+
 config TRACING
         bool
         select DEBUG_FS
@@ -56,6 +78,11 @@ config TRACING
         select TRACEPOINTS
         select NOP_TRACER
         select BINARY_PRINTF
+        select EVENT_TRACING
+
+config GENERIC_TRACER
+        bool
+        select TRACING
 
 #
 # Minimum requirements an architecture has to meet for us to
@@ -73,14 +100,20 @@ config TRACING_SUPPORT
 
 if TRACING_SUPPORT
 
-menu "Tracers"
+menuconfig FTRACE
+        bool "Tracers"
+        default y if DEBUG_KERNEL
+        help
+         Enable the kernel tracing infrastructure.
+
+if FTRACE
 
 config FUNCTION_TRACER
         bool "Kernel Function Tracer"
         depends on HAVE_FUNCTION_TRACER
         select FRAME_POINTER
         select KALLSYMS
-        select TRACING
+        select GENERIC_TRACER
         select CONTEXT_SWITCH_TRACER
         help
           Enable the kernel to trace every kernel function. This is done
@@ -95,6 +128,7 @@ config FUNCTION_GRAPH_TRACER
         bool "Kernel Function Graph Tracer"
         depends on HAVE_FUNCTION_GRAPH_TRACER
         depends on FUNCTION_TRACER
+        depends on !X86_32 || !CC_OPTIMIZE_FOR_SIZE
         default y
         help
           Enable the kernel to trace a function at both its return
@@ -104,13 +138,14 @@ config FUNCTION_GRAPH_TRACER
           the return value. This is done by setting the current return 
           address on the current task structure into a stack of calls.
 
+
 config IRQSOFF_TRACER
         bool "Interrupts-off Latency Tracer"
         default n
         depends on TRACE_IRQFLAGS_SUPPORT
         depends on GENERIC_TIME
         select TRACE_IRQFLAGS
-        select TRACING
+        select GENERIC_TRACER
         select TRACER_MAX_TRACE
         help
           This option measures the time spent in irqs-off critical
@@ -120,7 +155,7 @@ config IRQSOFF_TRACER
           disabled by default and can be runtime (re-)started
           via:
 
-              echo 0 > /debugfs/tracing/tracing_max_latency
+              echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
 
           (Note that kernel size and overhead increases with this option
           enabled. This option and the preempt-off timing option can be
@@ -131,7 +166,7 @@ config PREEMPT_TRACER
         default n
         depends on GENERIC_TIME
         depends on PREEMPT
-        select TRACING
+        select GENERIC_TRACER
         select TRACER_MAX_TRACE
         help
           This option measures the time spent in preemption off critical
@@ -141,7 +176,7 @@ config PREEMPT_TRACER
           disabled by default and can be runtime (re-)started
           via:
 
-              echo 0 > /debugfs/tracing/tracing_max_latency
+              echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
 
           (Note that kernel size and overhead increases with this option
           enabled. This option and the irqs-off timing option can be
@@ -150,7 +185,7 @@ config PREEMPT_TRACER
 config SYSPROF_TRACER
         bool "Sysprof Tracer"
         depends on X86
-        select TRACING
+        select GENERIC_TRACER
         select CONTEXT_SWITCH_TRACER
         help
           This tracer provides the trace needed by the 'Sysprof' userspace
@@ -158,40 +193,33 @@ config SYSPROF_TRACER
 
 config SCHED_TRACER
         bool "Scheduling Latency Tracer"
-        select TRACING
+        select GENERIC_TRACER
         select CONTEXT_SWITCH_TRACER
         select TRACER_MAX_TRACE
         help
           This tracer tracks the latency of the highest priority task
           to be scheduled in, starting from the point it has woken up.
 
-config CONTEXT_SWITCH_TRACER
-        bool "Trace process context switches"
-        select TRACING
-        select MARKERS
-        help
-          This tracer gets called from the context switch and records
-          all switching of tasks.
-
-config EVENT_TRACER
-        bool "Trace various events in the kernel"
+config ENABLE_DEFAULT_TRACERS
+        bool "Trace process context switches and events"
+        depends on !GENERIC_TRACER
         select TRACING
         help
           This tracer hooks to various trace points in the kernel
           allowing the user to pick and choose which trace point they
-          want to trace.
+          want to trace. It also includes the sched_switch tracer plugin.
 
 config FTRACE_SYSCALLS
         bool "Trace syscalls"
         depends on HAVE_FTRACE_SYSCALLS
-        select TRACING
+        select GENERIC_TRACER
         select KALLSYMS
         help
           Basic tracer to catch the syscall entry and exit events.
 
 config BOOT_TRACER
         bool "Trace boot initcalls"
-        select TRACING
+        select GENERIC_TRACER
         select CONTEXT_SWITCH_TRACER
         help
           This tracer helps developers to optimize boot times: it records
@@ -207,34 +235,61 @@ config BOOT_TRACER
           to enable this on bootup.
 
 config TRACE_BRANCH_PROFILING
+        bool
+        select GENERIC_TRACER
+
+choice
+        prompt "Branch Profiling"
+        default BRANCH_PROFILE_NONE
+        help
+         The branch profiling is a software profiler. It will add hooks
+         into the C conditionals to test which path a branch takes.
+
+         The likely/unlikely profiler only looks at the conditions that
+         are annotated with a likely or unlikely macro.
+
+         The "all branch" profiler will profile every if statement in the
+         kernel. This profiler will also enable the likely/unlikely
+         profiler as well.
+
+         Either of the above profilers add a bit of overhead to the system.
+         If unsure choose "No branch profiling".
+
+config BRANCH_PROFILE_NONE
+        bool "No branch profiling"
+        help
+         No branch profiling. Branch profiling adds a bit of overhead.
+         Only enable it if you want to analyse the branching behavior.
+         Otherwise keep it disabled.
+
+config PROFILE_ANNOTATED_BRANCHES
         bool "Trace likely/unlikely profiler"
-        select TRACING
+        select TRACE_BRANCH_PROFILING
         help
           This tracer profiles all the the likely and unlikely macros
           in the kernel. It will display the results in:
 
-          /debugfs/tracing/profile_annotated_branch
+          /sys/kernel/debug/tracing/profile_annotated_branch
 
           Note: this will add a significant overhead, only turn this
           on if you need to profile the system's use of these macros.
 
-          Say N if unsure.
-
 config PROFILE_ALL_BRANCHES
         bool "Profile all if conditionals"
-        depends on TRACE_BRANCH_PROFILING
+        select TRACE_BRANCH_PROFILING
         help
           This tracer profiles all branch conditions. Every if ()
           taken in the kernel is recorded whether it hit or miss.
           The results will be displayed in:
 
-          /debugfs/tracing/profile_branch
+          /sys/kernel/debug/tracing/profile_branch
+
+          This option also enables the likely/unlikely profiler.
 
           This configuration, when enabled, will impose a great overhead
           on the system. This should only be enabled when the system
           is to be analyzed
-
-          Say N if unsure.
+endchoice
 
 config TRACING_BRANCHES
         bool
@@ -261,7 +316,7 @@ config BRANCH_TRACER
 config POWER_TRACER
         bool "Trace power consumption behavior"
         depends on X86
-        select TRACING
+        select GENERIC_TRACER
         help
           This tracer helps developers to analyze and optimize the kernels
           power management decisions, specifically the C-state and P-state
@@ -276,7 +331,7 @@ config STACK_TRACER
         select KALLSYMS
         help
           This special tracer records the maximum stack footprint of the
-          kernel and displays it in debugfs/tracing/stack_trace.
+          kernel and displays it in /sys/kernel/debug/tracing/stack_trace.
 
           This tracer works by hooking into every function call that the
           kernel executes, and keeping a maximum stack depth value and
@@ -295,14 +350,14 @@ config STACK_TRACER
 config HW_BRANCH_TRACER
         depends on HAVE_HW_BRANCH_TRACER
         bool "Trace hw branches"
-        select TRACING
+        select GENERIC_TRACER
         help
           This tracer records all branches on the system in a circular
           buffer giving access to the last N branches for each cpu.
 
 config KMEMTRACE
         bool "Trace SLAB allocations"
-        select TRACING
+        select GENERIC_TRACER
         help
           kmemtrace provides tracing for slab allocator functions, such as
           kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected
@@ -322,7 +377,7 @@ config KMEMTRACE
 
 config WORKQUEUE_TRACER
         bool "Trace workqueues"
-        select TRACING
+        select GENERIC_TRACER
         help
           The workqueue tracer provides some statistical informations
           about each cpu workqueue thread such as the number of the
@@ -338,7 +393,7 @@ config BLK_DEV_IO_TRACE
         select RELAY
         select DEBUG_FS
         select TRACEPOINTS
-        select TRACING
+        select GENERIC_TRACER
         select STACKTRACE
         help
           Say Y here if you want to be able to trace the block layer actions
@@ -375,6 +430,20 @@ config DYNAMIC_FTRACE
          were made. If so, it runs stop_machine (stops all CPUS)
          and modifies the code to jump over the call to ftrace.
 
+config FUNCTION_PROFILER
+        bool "Kernel function profiler"
+        depends on FUNCTION_TRACER
+        default n
+        help
+         This option enables the kernel function profiler. A file is created
+         in debugfs called function_profile_enabled which defaults to zero.
+         When a 1 is echoed into this file profiling begins, and when a
+         zero is entered, profiling stops. A file in the trace_stats
+         directory called functions, that show the list of functions that
+         have been hit and their counters.
+
+         If in doubt, say N
+
 config FTRACE_MCOUNT_RECORD
         def_bool y
         depends on DYNAMIC_FTRACE
@@ -385,7 +454,7 @@ config FTRACE_SELFTEST
 
 config FTRACE_STARTUP_TEST
         bool "Perform a startup test on ftrace"
-        depends on TRACING
+        depends on GENERIC_TRACER
         select FTRACE_SELFTEST
         help
           This option performs a series of startup tests on ftrace. On bootup
@@ -396,7 +465,7 @@ config FTRACE_STARTUP_TEST
 config MMIOTRACE
         bool "Memory mapped IO tracing"
         depends on HAVE_MMIOTRACE_SUPPORT && PCI
-        select TRACING
+        select GENERIC_TRACER
         help
           Mmiotrace traces Memory Mapped I/O access and is meant for
           debugging and reverse engineering. It is called from the ioremap
@@ -416,7 +485,23 @@ config MMIOTRACE_TEST
 
           Say N, unless you absolutely know what you are doing.
 
-endmenu
+config RING_BUFFER_BENCHMARK
+        tristate "Ring buffer benchmark stress tester"
+        depends on RING_BUFFER
+        help
+          This option creates a test to stress the ring buffer and bench mark it.
+          It creates its own ring buffer such that it will not interfer with
+          any other users of the ring buffer (such as ftrace). It then creates
+          a producer and consumer that will run for 10 seconds and sleep for
+          10 seconds. Each interval it will print out the number of events
+          it recorded and give a rough estimate of how long each iteration took.
+
+          It does not disable interrupts or raise its priority, so it may be
+          affected by processes that are running.
+
+          If unsure, say N
+
+endif # FTRACE
 
 endif # TRACING_SUPPORT
 
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 2630f5121ec1..844164dca90a 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -15,11 +15,17 @@ ifdef CONFIG_TRACING_BRANCHES
 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
 endif
 
+#
+# Make the trace clocks available generally: it's infrastructure
+# relied on by ptrace for example:
+#
+obj-y += trace_clock.o
+
 obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o
 obj-$(CONFIG_RING_BUFFER) += ring_buffer.o
+obj-$(CONFIG_RING_BUFFER_BENCHMARK) += ring_buffer_benchmark.o
 
 obj-$(CONFIG_TRACING) += trace.o
-obj-$(CONFIG_TRACING) += trace_clock.o
 obj-$(CONFIG_TRACING) += trace_output.o
 obj-$(CONFIG_TRACING) += trace_stat.o
 obj-$(CONFIG_TRACING) += trace_printk.o
@@ -39,12 +45,14 @@ obj-$(CONFIG_HW_BRANCH_TRACER) += trace_hw_branches.o
 obj-$(CONFIG_POWER_TRACER) += trace_power.o
 obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
 obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
-obj-$(CONFIG_BLK_DEV_IO_TRACE)  += blktrace.o
-obj-$(CONFIG_EVENT_TRACER) += trace_events.o
-obj-$(CONFIG_EVENT_TRACER) += events.o
-obj-$(CONFIG_EVENT_TRACER) += trace_export.o
+obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
+ifeq ($(CONFIG_BLOCK),y)
+obj-$(CONFIG_EVENT_TRACING) += blktrace.o
+endif
+obj-$(CONFIG_EVENT_TRACING) += trace_events.o
+obj-$(CONFIG_EVENT_TRACING) += trace_export.o
 obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o
 obj-$(CONFIG_EVENT_PROFILE) += trace_event_profile.o
-obj-$(CONFIG_EVENT_TRACER) += trace_events_filter.o
+obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
 
 libftrace-y := ftrace.o
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 921ef5d1f0ba..39af8af6fc30 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -23,10 +23,14 @@
 #include <linux/mutex.h>
 #include <linux/debugfs.h>
 #include <linux/time.h>
-#include <trace/block.h>
 #include <linux/uaccess.h>
+
+#include <trace/events/block.h>
+
 #include "trace_output.h"
 
+#ifdef CONFIG_BLK_DEV_IO_TRACE
+
 static unsigned int blktrace_seq __read_mostly = 1;
 
 static struct trace_array *blk_tr;
@@ -147,7 +151,7 @@ static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
 {
         if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0)
                 return 1;
-        if (sector < bt->start_lba || sector > bt->end_lba)
+        if (sector && (sector < bt->start_lba || sector > bt->end_lba))
                 return 1;
         if (bt->pid && pid != bt->pid)
                 return 1;
@@ -192,7 +196,7 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
         what |= MASK_TC_BIT(rw, DISCARD);
 
         pid = tsk->pid;
-        if (unlikely(act_log_check(bt, what, sector, pid)))
+        if (act_log_check(bt, what, sector, pid))
                 return;
         cpu = raw_smp_processor_id();
 
@@ -262,6 +266,7 @@ static void blk_trace_free(struct blk_trace *bt)
 {
         debugfs_remove(bt->msg_file);
         debugfs_remove(bt->dropped_file);
+        debugfs_remove(bt->dir);
         relay_close(bt->rchan);
         free_percpu(bt->sequence);
         free_percpu(bt->msg_data);
@@ -403,11 +408,29 @@ static struct rchan_callbacks blk_relay_callbacks = {
         .remove_buf_file        = blk_remove_buf_file_callback,
 };
 
+static void blk_trace_setup_lba(struct blk_trace *bt,
+                                struct block_device *bdev)
+{
+        struct hd_struct *part = NULL;
+
+        if (bdev)
+                part = bdev->bd_part;
+
+        if (part) {
+                bt->start_lba = part->start_sect;
+                bt->end_lba = part->start_sect + part->nr_sects;
+        } else {
+                bt->start_lba = 0;
+                bt->end_lba = -1ULL;
+        }
+}
+
 /*
  * Setup everything required to start tracing
  */
 int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
-                        struct blk_user_trace_setup *buts)
+                       struct block_device *bdev,
+                       struct blk_user_trace_setup *buts)
 {
         struct blk_trace *old_bt, *bt = NULL;
         struct dentry *dir = NULL;
@@ -480,10 +503,13 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
         if (!bt->act_mask)
                 bt->act_mask = (u16) -1;
 
-        bt->start_lba = buts->start_lba;
-        bt->end_lba = buts->end_lba;
-        if (!bt->end_lba)
-                bt->end_lba = -1ULL;
+        blk_trace_setup_lba(bt, bdev);
+
+        /* overwrite with user settings */
+        if (buts->start_lba)
+                bt->start_lba = buts->start_lba;
+        if (buts->end_lba)
+                bt->end_lba = buts->end_lba;
 
         bt->pid = buts->pid;
         bt->trace_state = Blktrace_setup;
@@ -505,6 +531,7 @@ err:
 }
 
 int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
+                    struct block_device *bdev,
                     char __user *arg)
 {
         struct blk_user_trace_setup buts;
@@ -514,7 +541,7 @@ int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
         if (ret)
                 return -EFAULT;
 
-        ret = do_blk_trace_setup(q, name, dev, &buts);
+        ret = do_blk_trace_setup(q, name, dev, bdev, &buts);
         if (ret)
                 return ret;
 
@@ -582,7 +609,7 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
         switch (cmd) {
         case BLKTRACESETUP:
                 bdevname(bdev, b);
-                ret = blk_trace_setup(q, b, bdev->bd_dev, arg);
+                ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
                 break;
         case BLKTRACESTART:
                 start = 1;
@@ -642,12 +669,12 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
 
         if (blk_pc_request(rq)) {
                 what |= BLK_TC_ACT(BLK_TC_PC);
-                __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors,
-                                rq->cmd_len, rq->cmd);
+                __blk_add_trace(bt, 0, blk_rq_bytes(rq), rw,
+                                what, rq->errors, rq->cmd_len, rq->cmd);
         } else  {
                 what |= BLK_TC_ACT(BLK_TC_FS);
-                __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
-                                rw, what, rq->errors, 0, NULL);
+                __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), rw,
+                                what, rq->errors, 0, NULL);
         }
 }
 
@@ -809,7 +836,6 @@ static void blk_add_trace_split(struct request_queue *q, struct bio *bio,
  * @bio:        the source bio
  * @dev:        target device
  * @from:       source sector
- * @to:         target sector
  *
  * Description:
  *     Device mapper or raid target sometimes need to split a bio because
@@ -817,7 +843,7 @@ static void blk_add_trace_split(struct request_queue *q, struct bio *bio,
  *
  **/
 static void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
-                                       dev_t dev, sector_t from, sector_t to)
+                                       dev_t dev, sector_t from)
 {
         struct blk_trace *bt = q->blk_trace;
         struct blk_io_trace_remap r;
@@ -825,12 +851,13 @@ static void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
         if (likely(!bt))
                 return;
 
-        r.device = cpu_to_be32(dev);
-        r.device_from = cpu_to_be32(bio->bi_bdev->bd_dev);
-        r.sector = cpu_to_be64(to);
+        r.device_from = cpu_to_be32(dev);
+        r.device_to   = cpu_to_be32(bio->bi_bdev->bd_dev);
+        r.sector_from = cpu_to_be64(from);
 
-        __blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP,
-                        !bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r);
+        __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw,
+                        BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE),
+                        sizeof(r), &r);
 }
 
 /**
@@ -854,11 +881,11 @@ void blk_add_driver_data(struct request_queue *q,
                 return;
 
         if (blk_pc_request(rq))
-                __blk_add_trace(bt, 0, rq->data_len, 0, BLK_TA_DRV_DATA,
-                                rq->errors, len, data);
+                __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0,
+                                BLK_TA_DRV_DATA, rq->errors, len, data);
         else
-                __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
-                                0, BLK_TA_DRV_DATA, rq->errors, len, data);
+                __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0,
+                                BLK_TA_DRV_DATA, rq->errors, len, data);
 }
 EXPORT_SYMBOL_GPL(blk_add_driver_data);
 
@@ -971,6 +998,16 @@ static inline const void *pdu_start(const struct trace_entry *ent)
         return te_blk_io_trace(ent) + 1;
 }
 
+static inline u32 t_action(const struct trace_entry *ent)
+{
+        return te_blk_io_trace(ent)->action;
+}
+
+static inline u32 t_bytes(const struct trace_entry *ent)
+{
+        return te_blk_io_trace(ent)->bytes;
+}
+
 static inline u32 t_sec(const struct trace_entry *ent)
 {
         return te_blk_io_trace(ent)->bytes >> 9;
@@ -996,11 +1033,11 @@ static void get_pdu_remap(const struct trace_entry *ent,
                           struct blk_io_trace_remap *r)
 {
         const struct blk_io_trace_remap *__r = pdu_start(ent);
-        __u64 sector = __r->sector;
+        __u64 sector_from = __r->sector_from;
 
-        r->device = be32_to_cpu(__r->device);
         r->device_from = be32_to_cpu(__r->device_from);
-        r->sector = be64_to_cpu(sector);
+        r->device_to   = be32_to_cpu(__r->device_to);
+        r->sector_from = be64_to_cpu(sector_from);
 }
 
 typedef int (blk_log_action_t) (struct trace_iterator *iter, const char *act);
@@ -1031,36 +1068,98 @@ static int blk_log_action(struct trace_iterator *iter, const char *act)
                                 MAJOR(t->device), MINOR(t->device), act, rwbs);
 }
 
+static int blk_log_dump_pdu(struct trace_seq *s, const struct trace_entry *ent)
+{
+        const unsigned char *pdu_buf;
+        int pdu_len;
+        int i, end, ret;
+
+        pdu_buf = pdu_start(ent);
+        pdu_len = te_blk_io_trace(ent)->pdu_len;
+
+        if (!pdu_len)
+                return 1;
+
+        /* find the last zero that needs to be printed */
+        for (end = pdu_len - 1; end >= 0; end--)
+                if (pdu_buf[end])
+                        break;
+        end++;
+
+        if (!trace_seq_putc(s, '('))
+                return 0;
+
+        for (i = 0; i < pdu_len; i++) {
+
+                ret = trace_seq_printf(s, "%s%02x",
+                                       i == 0 ? "" : " ", pdu_buf[i]);
+                if (!ret)
+                        return ret;
+
+                /*
+                 * stop when the rest is just zeroes and indicate so
+                 * with a ".." appended
+                 */
+                if (i == end && end != pdu_len - 1)
+                        return trace_seq_puts(s, " ..) ");
+        }
+
+        return trace_seq_puts(s, ") ");
+}
+
 static int blk_log_generic(struct trace_seq *s, const struct trace_entry *ent)
 {
         char cmd[TASK_COMM_LEN];
 
         trace_find_cmdline(ent->pid, cmd);
 
-        if (t_sec(ent))
-                return trace_seq_printf(s, "%llu + %u [%s]\n",
-                                        t_sector(ent), t_sec(ent), cmd);
-        return trace_seq_printf(s, "[%s]\n", cmd);
+        if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) {
+                int ret;
+
+                ret = trace_seq_printf(s, "%u ", t_bytes(ent));
+                if (!ret)
+                        return 0;
+                ret = blk_log_dump_pdu(s, ent);
+                if (!ret)
+                        return 0;
+                return trace_seq_printf(s, "[%s]\n", cmd);
+        } else {
+                if (t_sec(ent))
+                        return trace_seq_printf(s, "%llu + %u [%s]\n",
+                                                t_sector(ent), t_sec(ent), cmd);
+                return trace_seq_printf(s, "[%s]\n", cmd);
+        }
 }
 
 static int blk_log_with_error(struct trace_seq *s,
                               const struct trace_entry *ent)
 {
-        if (t_sec(ent))
-                return trace_seq_printf(s, "%llu + %u [%d]\n", t_sector(ent),
-                                        t_sec(ent), t_error(ent));
-        return trace_seq_printf(s, "%llu [%d]\n", t_sector(ent), t_error(ent));
+        if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) {
+                int ret;
+
+                ret = blk_log_dump_pdu(s, ent);
+                if (ret)
+                        return trace_seq_printf(s, "[%d]\n", t_error(ent));
+                return 0;
+        } else {
+                if (t_sec(ent))
+                        return trace_seq_printf(s, "%llu + %u [%d]\n",
+                                                t_sector(ent),
+                                                t_sec(ent), t_error(ent));
+                return trace_seq_printf(s, "%llu [%d]\n",
+                                        t_sector(ent), t_error(ent));
+        }
 }
 
 static int blk_log_remap(struct trace_seq *s, const struct trace_entry *ent)
 {
-        struct blk_io_trace_remap r = { .device = 0, };
+        struct blk_io_trace_remap r = { .device_from = 0, };
 
         get_pdu_remap(ent, &r);
         return trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n",
-                               t_sector(ent),
-                               t_sec(ent), MAJOR(r.device), MINOR(r.device),
-                               (unsigned long long)r.sector);
+                                t_sector(ent), t_sec(ent),
+                                MAJOR(r.device_from), MINOR(r.device_from),
+                                (unsigned long long)r.sector_from);
 }
 
 static int blk_log_plug(struct trace_seq *s, const struct trace_entry *ent)
@@ -1117,7 +1216,6 @@ static void blk_tracer_print_header(struct seq_file *m)
 static void blk_tracer_start(struct trace_array *tr)
 {
         blk_tracer_enabled = true;
-        trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
 }
 
 static int blk_tracer_init(struct trace_array *tr)
@@ -1130,7 +1228,6 @@ static int blk_tracer_init(struct trace_array *tr)
 static void blk_tracer_stop(struct trace_array *tr)
 {
         blk_tracer_enabled = false;
-        trace_flags |= TRACE_ITER_CONTEXT_INFO;
 }
 
 static void blk_tracer_reset(struct trace_array *tr)
@@ -1182,7 +1279,7 @@ static enum print_line_t print_one_line(struct trace_iterator *iter,
         }
 
         if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act)))
-                ret = trace_seq_printf(s, "Bad pc action %x\n", what);
+                ret = trace_seq_printf(s, "Unknown action %x\n", what);
         else {
                 ret = log_action(iter, what2act[what].act[long_act]);
                 if (ret)
@@ -1195,9 +1292,6 @@ out:
 static enum print_line_t blk_trace_event_print(struct trace_iterator *iter,
                                                int flags)
 {
-        if (!trace_print_context(iter))
-                return TRACE_TYPE_PARTIAL_LINE;
-
         return print_one_line(iter, false);
 }
 
@@ -1232,6 +1326,18 @@ static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter)
         return print_one_line(iter, true);
 }
 
+static int blk_tracer_set_flag(u32 old_flags, u32 bit, int set)
+{
+        /* don't output context-info for blk_classic output */
+        if (bit == TRACE_BLK_OPT_CLASSIC) {
+                if (set)
+                        trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
+                else
+                        trace_flags |= TRACE_ITER_CONTEXT_INFO;
+        }
+        return 0;
+}
+
 static struct tracer blk_tracer __read_mostly = {
         .name           = "blk",
         .init           = blk_tracer_init,
@@ -1241,6 +1347,7 @@ static struct tracer blk_tracer __read_mostly = {
         .print_header   = blk_tracer_print_header,
         .print_line     = blk_tracer_print_line,
         .flags          = &blk_tracer_flags,
+        .set_flag       = blk_tracer_set_flag,
 };
 
 static struct trace_event trace_blk_event = {
@@ -1285,7 +1392,8 @@ static int blk_trace_remove_queue(struct request_queue *q)
 /*
  * Setup everything required to start tracing
  */
-static int blk_trace_setup_queue(struct request_queue *q, dev_t dev)
+static int blk_trace_setup_queue(struct request_queue *q,
+                                 struct block_device *bdev)
 {
         struct blk_trace *old_bt, *bt = NULL;
         int ret = -ENOMEM;
@@ -1298,9 +1406,10 @@ static int blk_trace_setup_queue(struct request_queue *q, dev_t dev)
         if (!bt->msg_data)
                 goto free_bt;
 
-        bt->dev = dev;
+        bt->dev = bdev->bd_dev;
         bt->act_mask = (u16)-1;
-        bt->end_lba = -1ULL;
+
+        blk_trace_setup_lba(bt, bdev);
 
         old_bt = xchg(&q->blk_trace, bt);
         if (old_bt != NULL) {
@@ -1517,7 +1626,7 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
 
         if (attr == &dev_attr_enable) {
                 if (value)
-                        ret = blk_trace_setup_queue(q, bdev->bd_dev);
+                        ret = blk_trace_setup_queue(q, bdev);
                 else
                         ret = blk_trace_remove_queue(q);
                 goto out_unlock_bdev;
@@ -1525,7 +1634,7 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
 
         ret = 0;
         if (q->blk_trace == NULL)
-                ret = blk_trace_setup_queue(q, bdev->bd_dev);
+                ret = blk_trace_setup_queue(q, bdev);
 
         if (ret == 0) {
                 if (attr == &dev_attr_act_mask)
@@ -1548,3 +1657,77 @@ out:
         return ret ? ret : count;
 }
 
+int blk_trace_init_sysfs(struct device *dev)
+{
+        return sysfs_create_group(&dev->kobj, &blk_trace_attr_group);
+}
+
+#endif /* CONFIG_BLK_DEV_IO_TRACE */
+
+#ifdef CONFIG_EVENT_TRACING
+
+void blk_dump_cmd(char *buf, struct request *rq)
+{
+        int i, end;
+        int len = rq->cmd_len;
+        unsigned char *cmd = rq->cmd;
+
+        if (!blk_pc_request(rq)) {
+                buf[0] = '\0';
+                return;
+        }
+
+        for (end = len - 1; end >= 0; end--)
+                if (cmd[end])
+                        break;
+        end++;
+
+        for (i = 0; i < len; i++) {
+                buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]);
+                if (i == end && end != len - 1) {
+                        sprintf(buf, " ..");
+                        break;
+                }
+        }
+}
+
+void blk_fill_rwbs(char *rwbs, u32 rw, int bytes)
+{
+        int i = 0;
+
+        if (rw & WRITE)
+                rwbs[i++] = 'W';
+        else if (rw & 1 << BIO_RW_DISCARD)
+                rwbs[i++] = 'D';
+        else if (bytes)
+                rwbs[i++] = 'R';
+        else
+                rwbs[i++] = 'N';
+
+        if (rw & 1 << BIO_RW_AHEAD)
+                rwbs[i++] = 'A';
+        if (rw & 1 << BIO_RW_BARRIER)
+                rwbs[i++] = 'B';
+        if (rw & 1 << BIO_RW_SYNCIO)
+                rwbs[i++] = 'S';
+        if (rw & 1 << BIO_RW_META)
+                rwbs[i++] = 'M';
+
+        rwbs[i] = '\0';
+}
+
+void blk_fill_rwbs_rq(char *rwbs, struct request *rq)
+{
+        int rw = rq->cmd_flags & 0x03;
+        int bytes;
+
+        if (blk_discard_rq(rq))
+                rw |= (1 << BIO_RW_DISCARD);
+
+        bytes = blk_rq_bytes(rq);
+
+        blk_fill_rwbs(rwbs, rw, bytes);
+}
+
+#endif /* CONFIG_EVENT_TRACING */
+
diff --git a/kernel/trace/events.c b/kernel/trace/events.c
deleted file mode 100644
index 246f2aa6dc46..000000000000
--- a/kernel/trace/events.c
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * This is the place to register all trace points as events.
- */
-
-#include <linux/stringify.h>
-
-#include <trace/trace_events.h>
-
-#include "trace_output.h"
-
-#include "trace_events_stage_1.h"
-#include "trace_events_stage_2.h"
-#include "trace_events_stage_3.h"
-
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index f1ed080406c3..3718d55fb4c3 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -29,11 +29,13 @@
 #include <linux/list.h>
 #include <linux/hash.h>
 
-#include <trace/sched.h>
+#include <trace/events/sched.h>
 
 #include <asm/ftrace.h>
+#include <asm/setup.h>
 
-#include "trace.h"
+#include "trace_output.h"
+#include "trace_stat.h"
 
 #define FTRACE_WARN_ON(cond)                    \
         do {                                    \
@@ -68,7 +70,7 @@ static DEFINE_MUTEX(ftrace_lock);
 
 static struct ftrace_ops ftrace_list_end __read_mostly =
 {
-        .func = ftrace_stub,
+        .func           = ftrace_stub,
 };
 
 static struct ftrace_ops *ftrace_list __read_mostly = &ftrace_list_end;
@@ -240,6 +242,580 @@ static void ftrace_update_pid_func(void)
 #endif
 }
 
+#ifdef CONFIG_FUNCTION_PROFILER
+struct ftrace_profile {
+        struct hlist_node               node;
+        unsigned long                   ip;
+        unsigned long                   counter;
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+        unsigned long long              time;
+#endif
+};
+
+struct ftrace_profile_page {
+        struct ftrace_profile_page      *next;
+        unsigned long                   index;
+        struct ftrace_profile           records[];
+};
+
+struct ftrace_profile_stat {
+        atomic_t                        disabled;
+        struct hlist_head               *hash;
+        struct ftrace_profile_page      *pages;
+        struct ftrace_profile_page      *start;
+        struct tracer_stat              stat;
+};
+
+#define PROFILE_RECORDS_SIZE                                            \
+        (PAGE_SIZE - offsetof(struct ftrace_profile_page, records))
+
+#define PROFILES_PER_PAGE                                       \
+        (PROFILE_RECORDS_SIZE / sizeof(struct ftrace_profile))
+
+static int ftrace_profile_bits __read_mostly;
+static int ftrace_profile_enabled __read_mostly;
+
+/* ftrace_profile_lock - synchronize the enable and disable of the profiler */
+static DEFINE_MUTEX(ftrace_profile_lock);
+
+static DEFINE_PER_CPU(struct ftrace_profile_stat, ftrace_profile_stats);
+
+#define FTRACE_PROFILE_HASH_SIZE 1024 /* must be power of 2 */
+
+static void *
+function_stat_next(void *v, int idx)
+{
+        struct ftrace_profile *rec = v;
+        struct ftrace_profile_page *pg;
+
+        pg = (struct ftrace_profile_page *)((unsigned long)rec & PAGE_MASK);
+
+ again:
+        rec++;
+        if ((void *)rec >= (void *)&pg->records[pg->index]) {
+                pg = pg->next;
+                if (!pg)
+                        return NULL;
+                rec = &pg->records[0];
+                if (!rec->counter)
+                        goto again;
+        }
+
+        return rec;
+}
+
+static void *function_stat_start(struct tracer_stat *trace)
+{
+        struct ftrace_profile_stat *stat =
+                container_of(trace, struct ftrace_profile_stat, stat);
+
+        if (!stat || !stat->start)
+                return NULL;
+
+        return function_stat_next(&stat->start->records[0], 0);
+}
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+/* function graph compares on total time */
+static int function_stat_cmp(void *p1, void *p2)
+{
+        struct ftrace_profile *a = p1;
+        struct ftrace_profile *b = p2;
+
+        if (a->time < b->time)
+                return -1;
+        if (a->time > b->time)
+                return 1;
+        else
+                return 0;
+}
+#else
+/* not function graph compares against hits */
+static int function_stat_cmp(void *p1, void *p2)
+{
+        struct ftrace_profile *a = p1;
+        struct ftrace_profile *b = p2;
+
+        if (a->counter < b->counter)
+                return -1;
+        if (a->counter > b->counter)
+                return 1;
+        else
+                return 0;
+}
+#endif
+
+static int function_stat_headers(struct seq_file *m)
+{
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+        seq_printf(m, "  Function                               "
+                   "Hit    Time            Avg\n"
+                      "  --------                               "
+                   "---    ----            ---\n");
+#else
+        seq_printf(m, "  Function                               Hit\n"
+                      "  --------                               ---\n");
+#endif
+        return 0;
+}
+
+static int function_stat_show(struct seq_file *m, void *v)
+{
+        struct ftrace_profile *rec = v;
+        char str[KSYM_SYMBOL_LEN];
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+        static DEFINE_MUTEX(mutex);
+        static struct trace_seq s;
+        unsigned long long avg;
+#endif
+
+        kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
+        seq_printf(m, "  %-30.30s  %10lu", str, rec->counter);
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+        seq_printf(m, "    ");
+        avg = rec->time;
+        do_div(avg, rec->counter);
+
+        mutex_lock(&mutex);
+        trace_seq_init(&s);
+        trace_print_graph_duration(rec->time, &s);
+        trace_seq_puts(&s, "    ");
+        trace_print_graph_duration(avg, &s);
+        trace_print_seq(m, &s);
+        mutex_unlock(&mutex);
+#endif
+        seq_putc(m, '\n');
+
+        return 0;
+}
+
+static void ftrace_profile_reset(struct ftrace_profile_stat *stat)
+{
+        struct ftrace_profile_page *pg;
+
+        pg = stat->pages = stat->start;
+
+        while (pg) {
+                memset(pg->records, 0, PROFILE_RECORDS_SIZE);
+                pg->index = 0;
+                pg = pg->next;
+        }
+
+        memset(stat->hash, 0,
+               FTRACE_PROFILE_HASH_SIZE * sizeof(struct hlist_head));
+}
+
+int ftrace_profile_pages_init(struct ftrace_profile_stat *stat)
+{
+        struct ftrace_profile_page *pg;
+        int functions;
+        int pages;
+        int i;
+
+        /* If we already allocated, do nothing */
+        if (stat->pages)
+                return 0;
+
+        stat->pages = (void *)get_zeroed_page(GFP_KERNEL);
+        if (!stat->pages)
+                return -ENOMEM;
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+        functions = ftrace_update_tot_cnt;
+#else
+        /*
+         * We do not know the number of functions that exist because
+         * dynamic tracing is what counts them. With past experience
+         * we have around 20K functions. That should be more than enough.
+         * It is highly unlikely we will execute every function in
+         * the kernel.
+         */
+        functions = 20000;
+#endif
+
+        pg = stat->start = stat->pages;
+
+        pages = DIV_ROUND_UP(functions, PROFILES_PER_PAGE);
+
+        for (i = 0; i < pages; i++) {
+                pg->next = (void *)get_zeroed_page(GFP_KERNEL);
+                if (!pg->next)
+                        goto out_free;
+                pg = pg->next;
+        }
+
+        return 0;
+
+ out_free:
+        pg = stat->start;
+        while (pg) {
+                unsigned long tmp = (unsigned long)pg;
+
+                pg = pg->next;
+                free_page(tmp);
+        }
+
+        free_page((unsigned long)stat->pages);
+        stat->pages = NULL;
+        stat->start = NULL;
+
+        return -ENOMEM;
+}
+
+static int ftrace_profile_init_cpu(int cpu)
+{
+        struct ftrace_profile_stat *stat;
+        int size;
+
+        stat = &per_cpu(ftrace_profile_stats, cpu);
+
+        if (stat->hash) {
+                /* If the profile is already created, simply reset it */
+                ftrace_profile_reset(stat);
+                return 0;
+        }
+
+        /*
+         * We are profiling all functions, but usually only a few thousand
+         * functions are hit. We'll make a hash of 1024 items.
+         */
+        size = FTRACE_PROFILE_HASH_SIZE;
+
+        stat->hash = kzalloc(sizeof(struct hlist_head) * size, GFP_KERNEL);
+
+        if (!stat->hash)
+                return -ENOMEM;
+
+        if (!ftrace_profile_bits) {
+                size--;
+
+                for (; size; size >>= 1)
+                        ftrace_profile_bits++;
+        }
+
+        /* Preallocate the function profiling pages */
+        if (ftrace_profile_pages_init(stat) < 0) {
+                kfree(stat->hash);
+                stat->hash = NULL;
+                return -ENOMEM;
+        }
+
+        return 0;
+}
+
+static int ftrace_profile_init(void)
+{
+        int cpu;
+        int ret = 0;
+
+        for_each_online_cpu(cpu) {
+                ret = ftrace_profile_init_cpu(cpu);
+                if (ret)
+                        break;
+        }
+
+        return ret;
+}
+
+/* interrupts must be disabled */
+static struct ftrace_profile *
+ftrace_find_profiled_func(struct ftrace_profile_stat *stat, unsigned long ip)
+{
+        struct ftrace_profile *rec;
+        struct hlist_head *hhd;
+        struct hlist_node *n;
+        unsigned long key;
+
+        key = hash_long(ip, ftrace_profile_bits);
+        hhd = &stat->hash[key];
+
+        if (hlist_empty(hhd))
+                return NULL;
+
+        hlist_for_each_entry_rcu(rec, n, hhd, node) {
+                if (rec->ip == ip)
+                        return rec;
+        }
+
+        return NULL;
+}
+
+static void ftrace_add_profile(struct ftrace_profile_stat *stat,
+                               struct ftrace_profile *rec)
+{
+        unsigned long key;
+
+        key = hash_long(rec->ip, ftrace_profile_bits);
+        hlist_add_head_rcu(&rec->node, &stat->hash[key]);
+}
+
+/*
+ * The memory is already allocated, this simply finds a new record to use.
+ */
+static struct ftrace_profile *
+ftrace_profile_alloc(struct ftrace_profile_stat *stat, unsigned long ip)
+{
+        struct ftrace_profile *rec = NULL;
+
+        /* prevent recursion (from NMIs) */
+        if (atomic_inc_return(&stat->disabled) != 1)
+                goto out;
+
+        /*
+         * Try to find the function again since an NMI
+         * could have added it
+         */
+        rec = ftrace_find_profiled_func(stat, ip);
+        if (rec)
+                goto out;
+
+        if (stat->pages->index == PROFILES_PER_PAGE) {
+                if (!stat->pages->next)
+                        goto out;
+                stat->pages = stat->pages->next;
+        }
+
+        rec = &stat->pages->records[stat->pages->index++];
+        rec->ip = ip;
+        ftrace_add_profile(stat, rec);
+
+ out:
+        atomic_dec(&stat->disabled);
+
+        return rec;
+}
+
+static void
+function_profile_call(unsigned long ip, unsigned long parent_ip)
+{
+        struct ftrace_profile_stat *stat;
+        struct ftrace_profile *rec;
+        unsigned long flags;
+
+        if (!ftrace_profile_enabled)
+                return;
+
+        local_irq_save(flags);
+
+        stat = &__get_cpu_var(ftrace_profile_stats);
+        if (!stat->hash || !ftrace_profile_enabled)
+                goto out;
+
+        rec = ftrace_find_profiled_func(stat, ip);
+        if (!rec) {
+                rec = ftrace_profile_alloc(stat, ip);
+                if (!rec)
+                        goto out;
+        }
+
+        rec->counter++;
+ out:
+        local_irq_restore(flags);
+}
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+static int profile_graph_entry(struct ftrace_graph_ent *trace)
+{
+        function_profile_call(trace->func, 0);
+        return 1;
+}
+
+static void profile_graph_return(struct ftrace_graph_ret *trace)
+{
+        struct ftrace_profile_stat *stat;
+        unsigned long long calltime;
+        struct ftrace_profile *rec;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        stat = &__get_cpu_var(ftrace_profile_stats);
+        if (!stat->hash || !ftrace_profile_enabled)
+                goto out;
+
+        calltime = trace->rettime - trace->calltime;
+
+        if (!(trace_flags & TRACE_ITER_GRAPH_TIME)) {
+                int index;
+
+                index = trace->depth;
+
+                /* Append this call time to the parent time to subtract */
+                if (index)
+                        current->ret_stack[index - 1].subtime += calltime;
+
+                if (current->ret_stack[index].subtime < calltime)
+                        calltime -= current->ret_stack[index].subtime;
+                else
+                        calltime = 0;
+        }
+
+        rec = ftrace_find_profiled_func(stat, trace->func);
+        if (rec)
+                rec->time += calltime;
+
+ out:
+        local_irq_restore(flags);
+}
+
+static int register_ftrace_profiler(void)
+{
+        return register_ftrace_graph(&profile_graph_return,
+                                     &profile_graph_entry);
+}
+
+static void unregister_ftrace_profiler(void)
+{
+        unregister_ftrace_graph();
+}
+#else
+static struct ftrace_ops ftrace_profile_ops __read_mostly =
+{
+        .func           = function_profile_call,
+};
+
+static int register_ftrace_profiler(void)
+{
+        return register_ftrace_function(&ftrace_profile_ops);
+}
+
+static void unregister_ftrace_profiler(void)
+{
+        unregister_ftrace_function(&ftrace_profile_ops);
+}
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
+static ssize_t
+ftrace_profile_write(struct file *filp, const char __user *ubuf,
+                     size_t cnt, loff_t *ppos)
+{
+        unsigned long val;
+        char buf[64];           /* big enough to hold a number */
+        int ret;
+
+        if (cnt >= sizeof(buf))
+                return -EINVAL;
+
+        if (copy_from_user(&buf, ubuf, cnt))
+                return -EFAULT;
+
+        buf[cnt] = 0;
+
+        ret = strict_strtoul(buf, 10, &val);
+        if (ret < 0)
+                return ret;
+
+        val = !!val;
+
+        mutex_lock(&ftrace_profile_lock);
+        if (ftrace_profile_enabled ^ val) {
+                if (val) {
+                        ret = ftrace_profile_init();
+                        if (ret < 0) {
+                                cnt = ret;
+                                goto out;
+                        }
+
+                        ret = register_ftrace_profiler();
+                        if (ret < 0) {
+                                cnt = ret;
+                                goto out;
+                        }
+                        ftrace_profile_enabled = 1;
+                } else {
+                        ftrace_profile_enabled = 0;
+                        /*
+                         * unregister_ftrace_profiler calls stop_machine
+                         * so this acts like an synchronize_sched.
+                         */
+                        unregister_ftrace_profiler();
+                }
+        }
+ out:
+        mutex_unlock(&ftrace_profile_lock);
+
+        filp->f_pos += cnt;
+
+        return cnt;
+}
+
+static ssize_t
+ftrace_profile_read(struct file *filp, char __user *ubuf,
+                     size_t cnt, loff_t *ppos)
+{
+        char buf[64];           /* big enough to hold a number */
+        int r;
+
+        r = sprintf(buf, "%u\n", ftrace_profile_enabled);
+        return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+}
+
+static const struct file_operations ftrace_profile_fops = {
+        .open           = tracing_open_generic,
+        .read           = ftrace_profile_read,
+        .write          = ftrace_profile_write,
+};
+
+/* used to initialize the real stat files */
+static struct tracer_stat function_stats __initdata = {
+        .name           = "functions",
+        .stat_start     = function_stat_start,
+        .stat_next      = function_stat_next,
+        .stat_cmp       = function_stat_cmp,
+        .stat_headers   = function_stat_headers,
+        .stat_show      = function_stat_show
+};
+
+static void ftrace_profile_debugfs(struct dentry *d_tracer)
+{
+        struct ftrace_profile_stat *stat;
+        struct dentry *entry;
+        char *name;
+        int ret;
+        int cpu;
+
+        for_each_possible_cpu(cpu) {
+                stat = &per_cpu(ftrace_profile_stats, cpu);
+
+                /* allocate enough for function name + cpu number */
+                name = kmalloc(32, GFP_KERNEL);
+                if (!name) {
+                        /*
+                         * The files created are permanent, if something happens
+                         * we still do not free memory.
+                         */
+                        kfree(stat);
+                        WARN(1,
+                             "Could not allocate stat file for cpu %d\n",
+                             cpu);
+                        return;
+                }
+                stat->stat = function_stats;
+                snprintf(name, 32, "function%d", cpu);
+                stat->stat.name = name;
+                ret = register_stat_tracer(&stat->stat);
+                if (ret) {
+                        WARN(1,
+                             "Could not register function stat for cpu %d\n",
+                             cpu);
+                        kfree(name);
+                        return;
+                }
+        }
+
+        entry = debugfs_create_file("function_profile_enabled", 0644,
+                                    d_tracer, NULL, &ftrace_profile_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs "
+                           "'function_profile_enabled' entry\n");
+}
+
+#else /* CONFIG_FUNCTION_PROFILER */
+static void ftrace_profile_debugfs(struct dentry *d_tracer)
+{
+}
+#endif /* CONFIG_FUNCTION_PROFILER */
+
 /* set when tracing only a pid */
 struct pid *ftrace_pid_trace;
 static struct pid * const ftrace_swapper_pid = &init_struct_pid;
@@ -261,7 +837,6 @@ struct ftrace_func_probe {
         struct rcu_head         rcu;
 };
 
-
 enum {
         FTRACE_ENABLE_CALLS             = (1 << 0),
         FTRACE_DISABLE_CALLS            = (1 << 1),
@@ -346,30 +921,6 @@ static void ftrace_free_rec(struct dyn_ftrace *rec)
         rec->flags |= FTRACE_FL_FREE;
 }
 
-void ftrace_release(void *start, unsigned long size)
-{
-        struct dyn_ftrace *rec;
-        struct ftrace_page *pg;
-        unsigned long s = (unsigned long)start;
-        unsigned long e = s + size;
-
-        if (ftrace_disabled || !start)
-                return;
-
-        mutex_lock(&ftrace_lock);
-        do_for_each_ftrace_rec(pg, rec) {
-                if ((rec->ip >= s) && (rec->ip < e)) {
-                        /*
-                         * rec->ip is changed in ftrace_free_rec()
-                         * It should not between s and e if record was freed.
-                         */
-                        FTRACE_WARN_ON(rec->flags & FTRACE_FL_FREE);
-                        ftrace_free_rec(rec);
-                }
-        } while_for_each_ftrace_rec();
-        mutex_unlock(&ftrace_lock);
-}
-
 static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip)
 {
         struct dyn_ftrace *rec;
@@ -673,6 +1224,13 @@ static void ftrace_shutdown(int command)
                 return;
 
         ftrace_start_up--;
+        /*
+         * Just warn in case of unbalance, no need to kill ftrace, it's not
+         * critical but the ftrace_call callers may be never nopped again after
+         * further ftrace uses.
+         */
+        WARN_ON_ONCE(ftrace_start_up < 0);
+
         if (!ftrace_start_up)
                 command |= FTRACE_DISABLE_CALLS;
 
@@ -1408,7 +1966,7 @@ function_trace_probe_call(unsigned long ip, unsigned long parent_ip)
 
 static struct ftrace_ops trace_probe_ops __read_mostly =
 {
-        .func = function_trace_probe_call,
+        .func           = function_trace_probe_call,
 };
 
 static int ftrace_probe_registered;
@@ -1823,6 +2381,45 @@ void ftrace_set_notrace(unsigned char *buf, int len, int reset)
         ftrace_set_regex(buf, len, reset, 0);
 }
 
+/*
+ * command line interface to allow users to set filters on boot up.
+ */
+#define FTRACE_FILTER_SIZE              COMMAND_LINE_SIZE
+static char ftrace_notrace_buf[FTRACE_FILTER_SIZE] __initdata;
+static char ftrace_filter_buf[FTRACE_FILTER_SIZE] __initdata;
+
+static int __init set_ftrace_notrace(char *str)
+{
+        strncpy(ftrace_notrace_buf, str, FTRACE_FILTER_SIZE);
+        return 1;
+}
+__setup("ftrace_notrace=", set_ftrace_notrace);
+
+static int __init set_ftrace_filter(char *str)
+{
+        strncpy(ftrace_filter_buf, str, FTRACE_FILTER_SIZE);
+        return 1;
+}
+__setup("ftrace_filter=", set_ftrace_filter);
+
+static void __init set_ftrace_early_filter(char *buf, int enable)
+{
+        char *func;
+
+        while (buf) {
+                func = strsep(&buf, ",");
+                ftrace_set_regex(func, strlen(func), 0, enable);
+        }
+}
+
+static void __init set_ftrace_early_filters(void)
+{
+        if (ftrace_filter_buf[0])
+                set_ftrace_early_filter(ftrace_filter_buf, 1);
+        if (ftrace_notrace_buf[0])
+                set_ftrace_early_filter(ftrace_notrace_buf, 0);
+}
+
 static int
 ftrace_regex_release(struct inode *inode, struct file *file, int enable)
 {
@@ -2128,38 +2725,23 @@ static const struct file_operations ftrace_graph_fops = {
 
 static __init int ftrace_init_dyn_debugfs(struct dentry *d_tracer)
 {
-        struct dentry *entry;
 
-        entry = debugfs_create_file("available_filter_functions", 0444,
-                                    d_tracer, NULL, &ftrace_avail_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'available_filter_functions' entry\n");
+        trace_create_file("available_filter_functions", 0444,
+                        d_tracer, NULL, &ftrace_avail_fops);
 
-        entry = debugfs_create_file("failures", 0444,
-                                    d_tracer, NULL, &ftrace_failures_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'failures' entry\n");
+        trace_create_file("failures", 0444,
+                        d_tracer, NULL, &ftrace_failures_fops);
 
-        entry = debugfs_create_file("set_ftrace_filter", 0644, d_tracer,
-                                    NULL, &ftrace_filter_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'set_ftrace_filter' entry\n");
+        trace_create_file("set_ftrace_filter", 0644, d_tracer,
+                        NULL, &ftrace_filter_fops);
 
-        entry = debugfs_create_file("set_ftrace_notrace", 0644, d_tracer,
+        trace_create_file("set_ftrace_notrace", 0644, d_tracer,
                                     NULL, &ftrace_notrace_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'set_ftrace_notrace' entry\n");
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
-        entry = debugfs_create_file("set_graph_function", 0444, d_tracer,
+        trace_create_file("set_graph_function", 0444, d_tracer,
                                     NULL,
                                     &ftrace_graph_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'set_graph_function' entry\n");
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 
         return 0;
@@ -2197,14 +2779,72 @@ static int ftrace_convert_nops(struct module *mod,
         return 0;
 }
 
-void ftrace_init_module(struct module *mod,
-                        unsigned long *start, unsigned long *end)
+#ifdef CONFIG_MODULES
+void ftrace_release(void *start, void *end)
+{
+        struct dyn_ftrace *rec;
+        struct ftrace_page *pg;
+        unsigned long s = (unsigned long)start;
+        unsigned long e = (unsigned long)end;
+
+        if (ftrace_disabled || !start || start == end)
+                return;
+
+        mutex_lock(&ftrace_lock);
+        do_for_each_ftrace_rec(pg, rec) {
+                if ((rec->ip >= s) && (rec->ip < e)) {
+                        /*
+                         * rec->ip is changed in ftrace_free_rec()
+                         * It should not between s and e if record was freed.
+                         */
+                        FTRACE_WARN_ON(rec->flags & FTRACE_FL_FREE);
+                        ftrace_free_rec(rec);
+                }
+        } while_for_each_ftrace_rec();
+        mutex_unlock(&ftrace_lock);
+}
+
+static void ftrace_init_module(struct module *mod,
+                               unsigned long *start, unsigned long *end)
 {
         if (ftrace_disabled || start == end)
                 return;
         ftrace_convert_nops(mod, start, end);
 }
 
+static int ftrace_module_notify(struct notifier_block *self,
+                                unsigned long val, void *data)
+{
+        struct module *mod = data;
+
+        switch (val) {
+        case MODULE_STATE_COMING:
+                ftrace_init_module(mod, mod->ftrace_callsites,
+                                   mod->ftrace_callsites +
+                                   mod->num_ftrace_callsites);
+                break;
+        case MODULE_STATE_GOING:
+                ftrace_release(mod->ftrace_callsites,
+                               mod->ftrace_callsites +
+                               mod->num_ftrace_callsites);
+                break;
+        }
+
+        return 0;
+}
+#else
+static int ftrace_module_notify(struct notifier_block *self,
+                                unsigned long val, void *data)
+{
+        return 0;
+}
+#endif /* CONFIG_MODULES */
+
+struct notifier_block ftrace_module_nb = {
+        .notifier_call = ftrace_module_notify,
+        .priority = 0,
+};
+
 extern unsigned long __start_mcount_loc[];
 extern unsigned long __stop_mcount_loc[];
 
@@ -2236,6 +2876,12 @@ void __init ftrace_init(void)
                                   __start_mcount_loc,
                                   __stop_mcount_loc);
 
+        ret = register_module_notifier(&ftrace_module_nb);
+        if (ret)
+                pr_warning("Failed to register trace ftrace module notifier\n");
+
+        set_ftrace_early_filters();
+
         return;
  failed:
         ftrace_disabled = 1;
@@ -2417,7 +3063,6 @@ static const struct file_operations ftrace_pid_fops = {
 static __init int ftrace_init_debugfs(void)
 {
         struct dentry *d_tracer;
-        struct dentry *entry;
 
         d_tracer = tracing_init_dentry();
         if (!d_tracer)
@@ -2425,11 +3070,11 @@ static __init int ftrace_init_debugfs(void)
 
         ftrace_init_dyn_debugfs(d_tracer);
 
-        entry = debugfs_create_file("set_ftrace_pid", 0644, d_tracer,
-                                    NULL, &ftrace_pid_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'set_ftrace_pid' entry\n");
+        trace_create_file("set_ftrace_pid", 0644, d_tracer,
+                            NULL, &ftrace_pid_fops);
+
+        ftrace_profile_debugfs(d_tracer);
+
         return 0;
 }
 fs_initcall(ftrace_init_debugfs);
@@ -2538,7 +3183,7 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 
-static atomic_t ftrace_graph_active;
+static int ftrace_graph_active;
 static struct notifier_block ftrace_suspend_notifier;
 
 int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace)
@@ -2580,12 +3225,12 @@ static int alloc_retstack_tasklist(struct ftrace_ret_stack **ret_stack_list)
                 }
 
                 if (t->ret_stack == NULL) {
-                        t->curr_ret_stack = -1;
-                        /* Make sure IRQs see the -1 first: */
-                        barrier();
-                        t->ret_stack = ret_stack_list[start++];
                         atomic_set(&t->tracing_graph_pause, 0);
                         atomic_set(&t->trace_overrun, 0);
+                        t->curr_ret_stack = -1;
+                        /* Make sure the tasks see the -1 first: */
+                        smp_wmb();
+                        t->ret_stack = ret_stack_list[start++];
                 }
         } while_each_thread(g, t);
 
@@ -2643,8 +3288,10 @@ static int start_graph_tracing(void)
                 return -ENOMEM;
 
         /* The cpu_boot init_task->ret_stack will never be freed */
-        for_each_online_cpu(cpu)
-                ftrace_graph_init_task(idle_task(cpu));
+        for_each_online_cpu(cpu) {
+                if (!idle_task(cpu)->ret_stack)
+                        ftrace_graph_init_task(idle_task(cpu));
+        }
 
         do {
                 ret = alloc_retstack_tasklist(ret_stack_list);
@@ -2690,7 +3337,7 @@ int register_ftrace_graph(trace_func_graph_ret_t retfunc,
         mutex_lock(&ftrace_lock);
 
         /* we currently allow only one tracer registered at a time */
-        if (atomic_read(&ftrace_graph_active)) {
+        if (ftrace_graph_active) {
                 ret = -EBUSY;
                 goto out;
         }
@@ -2698,10 +3345,10 @@ int register_ftrace_graph(trace_func_graph_ret_t retfunc,
         ftrace_suspend_notifier.notifier_call = ftrace_suspend_notifier_call;
         register_pm_notifier(&ftrace_suspend_notifier);
 
-        atomic_inc(&ftrace_graph_active);
+        ftrace_graph_active++;
         ret = start_graph_tracing();
         if (ret) {
-                atomic_dec(&ftrace_graph_active);
+                ftrace_graph_active--;
                 goto out;
         }
 
@@ -2719,10 +3366,10 @@ void unregister_ftrace_graph(void)
 {
         mutex_lock(&ftrace_lock);
 
-        if (!unlikely(atomic_read(&ftrace_graph_active)))
+        if (unlikely(!ftrace_graph_active))
                 goto out;
 
-        atomic_dec(&ftrace_graph_active);
+        ftrace_graph_active--;
         unregister_trace_sched_switch(ftrace_graph_probe_sched_switch);
         ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub;
         ftrace_graph_entry = ftrace_graph_entry_stub;
@@ -2736,18 +3383,25 @@ void unregister_ftrace_graph(void)
 /* Allocate a return stack for newly created task */
 void ftrace_graph_init_task(struct task_struct *t)
 {
-        if (atomic_read(&ftrace_graph_active)) {
-                t->ret_stack = kmalloc(FTRACE_RETFUNC_DEPTH
+        /* Make sure we do not use the parent ret_stack */
+        t->ret_stack = NULL;
+
+        if (ftrace_graph_active) {
+                struct ftrace_ret_stack *ret_stack;
+
+                ret_stack = kmalloc(FTRACE_RETFUNC_DEPTH
                                 * sizeof(struct ftrace_ret_stack),
                                 GFP_KERNEL);
-                if (!t->ret_stack)
+                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;
-        } else
-                t->ret_stack = NULL;
+                /* make curr_ret_stack visable before we add the ret_stack */
+                smp_wmb();
+                t->ret_stack = ret_stack;
+        }
 }
 
 void ftrace_graph_exit_task(struct task_struct *t)
diff --git a/kernel/trace/kmemtrace.c b/kernel/trace/kmemtrace.c
index 5011f4d91e37..1edaa9516e81 100644
--- a/kernel/trace/kmemtrace.c
+++ b/kernel/trace/kmemtrace.c
@@ -12,7 +12,7 @@
 #include <linux/dcache.h>
 #include <linux/fs.h>
 
-#include <trace/kmemtrace.h>
+#include <linux/kmemtrace.h>
 
 #include "trace_output.h"
 #include "trace.h"
@@ -42,6 +42,7 @@ static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
                                    gfp_t gfp_flags,
                                    int node)
 {
+        struct ftrace_event_call *call = &event_kmem_alloc;
         struct trace_array *tr = kmemtrace_array;
         struct kmemtrace_alloc_entry *entry;
         struct ring_buffer_event *event;
@@ -62,7 +63,8 @@ static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
         entry->gfp_flags        = gfp_flags;
         entry->node             = node;
 
-        ring_buffer_unlock_commit(tr->buffer, event);
+        if (!filter_check_discard(call, entry, tr->buffer, event))
+                ring_buffer_unlock_commit(tr->buffer, event);
 
         trace_wake_up();
 }
@@ -71,6 +73,7 @@ static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
                                   unsigned long call_site,
                                   const void *ptr)
 {
+        struct ftrace_event_call *call = &event_kmem_free;
         struct trace_array *tr = kmemtrace_array;
         struct kmemtrace_free_entry *entry;
         struct ring_buffer_event *event;
@@ -86,7 +89,8 @@ static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
         entry->call_site        = call_site;
         entry->ptr              = ptr;
 
-        ring_buffer_unlock_commit(tr->buffer, event);
+        if (!filter_check_discard(call, entry, tr->buffer, event))
+                ring_buffer_unlock_commit(tr->buffer, event);
 
         trace_wake_up();
 }
@@ -182,7 +186,7 @@ static int kmem_trace_init(struct trace_array *tr)
         int cpu;
         kmemtrace_array = tr;
 
-        for_each_cpu_mask(cpu, cpu_possible_map)
+        for_each_cpu(cpu, cpu_possible_mask)
                 tracing_reset(tr, cpu);
 
         kmemtrace_start_probes();
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 960cbf44c844..04dac2638258 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -10,6 +10,7 @@
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/hardirq.h>
+#include <linux/kmemcheck.h>
 #include <linux/module.h>
 #include <linux/percpu.h>
 #include <linux/mutex.h>
@@ -22,6 +23,28 @@
 #include "trace.h"
 
 /*
+ * The ring buffer header is special. We must manually up keep it.
+ */
+int ring_buffer_print_entry_header(struct trace_seq *s)
+{
+        int ret;
+
+        ret = trace_seq_printf(s, "# compressed entry header\n");
+        ret = trace_seq_printf(s, "\ttype_len    :    5 bits\n");
+        ret = trace_seq_printf(s, "\ttime_delta  :   27 bits\n");
+        ret = trace_seq_printf(s, "\tarray       :   32 bits\n");
+        ret = trace_seq_printf(s, "\n");
+        ret = trace_seq_printf(s, "\tpadding     : type == %d\n",
+                               RINGBUF_TYPE_PADDING);
+        ret = trace_seq_printf(s, "\ttime_extend : type == %d\n",
+                               RINGBUF_TYPE_TIME_EXTEND);
+        ret = trace_seq_printf(s, "\tdata max type_len  == %d\n",
+                               RINGBUF_TYPE_DATA_TYPE_LEN_MAX);
+
+        return ret;
+}
+
+/*
  * The ring buffer is made up of a list of pages. A separate list of pages is
  * allocated for each CPU. A writer may only write to a buffer that is
  * associated with the CPU it is currently executing on.  A reader may read
@@ -182,7 +205,11 @@ EXPORT_SYMBOL_GPL(tracing_is_on);
 
 #define RB_EVNT_HDR_SIZE (offsetof(struct ring_buffer_event, array))
 #define RB_ALIGNMENT            4U
-#define RB_MAX_SMALL_DATA       28
+#define RB_MAX_SMALL_DATA       (RB_ALIGNMENT * RINGBUF_TYPE_DATA_TYPE_LEN_MAX)
+#define RB_EVNT_MIN_SIZE        8U      /* two 32bit words */
+
+/* define RINGBUF_TYPE_DATA for 'case RINGBUF_TYPE_DATA:' */
+#define RINGBUF_TYPE_DATA 0 ... RINGBUF_TYPE_DATA_TYPE_LEN_MAX
 
 enum {
         RB_LEN_TIME_EXTEND = 8,
@@ -191,48 +218,28 @@ enum {
 
 static inline int rb_null_event(struct ring_buffer_event *event)
 {
-        return event->type == RINGBUF_TYPE_PADDING && event->time_delta == 0;
+        return event->type_len == RINGBUF_TYPE_PADDING
+                        && event->time_delta == 0;
 }
 
 static inline int rb_discarded_event(struct ring_buffer_event *event)
 {
-        return event->type == RINGBUF_TYPE_PADDING && event->time_delta;
+        return event->type_len == RINGBUF_TYPE_PADDING && event->time_delta;
 }
 
 static void rb_event_set_padding(struct ring_buffer_event *event)
 {
-        event->type = RINGBUF_TYPE_PADDING;
+        event->type_len = RINGBUF_TYPE_PADDING;
         event->time_delta = 0;
 }
 
-/**
- * ring_buffer_event_discard - discard an event in the ring buffer
- * @buffer: the ring buffer
- * @event: the event to discard
- *
- * Sometimes a event that is in the ring buffer needs to be ignored.
- * This function lets the user discard an event in the ring buffer
- * and then that event will not be read later.
- *
- * Note, it is up to the user to be careful with this, and protect
- * against races. If the user discards an event that has been consumed
- * it is possible that it could corrupt the ring buffer.
- */
-void ring_buffer_event_discard(struct ring_buffer_event *event)
-{
-        event->type = RINGBUF_TYPE_PADDING;
-        /* time delta must be non zero */
-        if (!event->time_delta)
-                event->time_delta = 1;
-}
-
 static unsigned
 rb_event_data_length(struct ring_buffer_event *event)
 {
         unsigned length;
 
-        if (event->len)
-                length = event->len * RB_ALIGNMENT;
+        if (event->type_len)
+                length = event->type_len * RB_ALIGNMENT;
         else
                 length = event->array[0];
         return length + RB_EVNT_HDR_SIZE;
@@ -242,12 +249,12 @@ rb_event_data_length(struct ring_buffer_event *event)
 static unsigned
 rb_event_length(struct ring_buffer_event *event)
 {
-        switch (event->type) {
+        switch (event->type_len) {
         case RINGBUF_TYPE_PADDING:
                 if (rb_null_event(event))
                         /* undefined */
                         return -1;
-                return rb_event_data_length(event);
+                return  event->array[0] + RB_EVNT_HDR_SIZE;
 
         case RINGBUF_TYPE_TIME_EXTEND:
                 return RB_LEN_TIME_EXTEND;
@@ -271,7 +278,7 @@ rb_event_length(struct ring_buffer_event *event)
 unsigned ring_buffer_event_length(struct ring_buffer_event *event)
 {
         unsigned length = rb_event_length(event);
-        if (event->type != RINGBUF_TYPE_DATA)
+        if (event->type_len > RINGBUF_TYPE_DATA_TYPE_LEN_MAX)
                 return length;
         length -= RB_EVNT_HDR_SIZE;
         if (length > RB_MAX_SMALL_DATA + sizeof(event->array[0]))
@@ -284,9 +291,9 @@ EXPORT_SYMBOL_GPL(ring_buffer_event_length);
 static void *
 rb_event_data(struct ring_buffer_event *event)
 {
-        BUG_ON(event->type != RINGBUF_TYPE_DATA);
+        BUG_ON(event->type_len > RINGBUF_TYPE_DATA_TYPE_LEN_MAX);
         /* If length is in len field, then array[0] has the data */
-        if (event->len)
+        if (event->type_len)
                 return (void *)&event->array[0];
         /* Otherwise length is in array[0] and array[1] has the data */
         return (void *)&event->array[1];
@@ -316,9 +323,10 @@ struct buffer_data_page {
 };
 
 struct buffer_page {
+        struct list_head list;          /* list of buffer pages */
         local_t          write;         /* index for next write */
         unsigned         read;          /* index for next read */
-        struct list_head list;          /* list of free pages */
+        local_t          entries;       /* entries on this page */
         struct buffer_data_page *page;  /* Actual data page */
 };
 
@@ -361,6 +369,34 @@ static inline int test_time_stamp(u64 delta)
 
 #define BUF_PAGE_SIZE (PAGE_SIZE - BUF_PAGE_HDR_SIZE)
 
+/* Max payload is BUF_PAGE_SIZE - header (8bytes) */
+#define BUF_MAX_DATA_SIZE (BUF_PAGE_SIZE - (sizeof(u32) * 2))
+
+/* Max number of timestamps that can fit on a page */
+#define RB_TIMESTAMPS_PER_PAGE  (BUF_PAGE_SIZE / RB_LEN_TIME_STAMP)
+
+int ring_buffer_print_page_header(struct trace_seq *s)
+{
+        struct buffer_data_page field;
+        int ret;
+
+        ret = trace_seq_printf(s, "\tfield: u64 timestamp;\t"
+                               "offset:0;\tsize:%u;\n",
+                               (unsigned int)sizeof(field.time_stamp));
+
+        ret = trace_seq_printf(s, "\tfield: local_t commit;\t"
+                               "offset:%u;\tsize:%u;\n",
+                               (unsigned int)offsetof(typeof(field), commit),
+                               (unsigned int)sizeof(field.commit));
+
+        ret = trace_seq_printf(s, "\tfield: char data;\t"
+                               "offset:%u;\tsize:%u;\n",
+                               (unsigned int)offsetof(typeof(field), data),
+                               (unsigned int)BUF_PAGE_SIZE);
+
+        return ret;
+}
+
 /*
  * head_page == tail_page && head == tail then buffer is empty.
  */
@@ -375,8 +411,13 @@ struct ring_buffer_per_cpu {
         struct buffer_page              *tail_page;     /* write to tail */
         struct buffer_page              *commit_page;   /* committed pages */
         struct buffer_page              *reader_page;
+        unsigned long                   nmi_dropped;
+        unsigned long                   commit_overrun;
         unsigned long                   overrun;
-        unsigned long                   entries;
+        unsigned long                   read;
+        local_t                         entries;
+        local_t                         committing;
+        local_t                         commits;
         u64                             write_stamp;
         u64                             read_stamp;
         atomic_t                        record_disabled;
@@ -389,6 +430,8 @@ struct ring_buffer {
         atomic_t                        record_disabled;
         cpumask_var_t                   cpumask;
 
+        struct lock_class_key           *reader_lock_key;
+
         struct mutex                    mutex;
 
         struct ring_buffer_per_cpu      **buffers;
@@ -420,13 +463,18 @@ struct ring_buffer_iter {
 /* Up this if you want to test the TIME_EXTENTS and normalization */
 #define DEBUG_SHIFT 0
 
+static inline u64 rb_time_stamp(struct ring_buffer *buffer, int cpu)
+{
+        /* shift to debug/test normalization and TIME_EXTENTS */
+        return buffer->clock() << DEBUG_SHIFT;
+}
+
 u64 ring_buffer_time_stamp(struct ring_buffer *buffer, int cpu)
 {
         u64 time;
 
         preempt_disable_notrace();
-        /* shift to debug/test normalization and TIME_EXTENTS */
-        time = buffer->clock() << DEBUG_SHIFT;
+        time = rb_time_stamp(buffer, cpu);
         preempt_enable_no_resched_notrace();
 
         return time;
@@ -523,6 +571,7 @@ rb_allocate_cpu_buffer(struct ring_buffer *buffer, int cpu)
         cpu_buffer->cpu = cpu;
         cpu_buffer->buffer = buffer;
         spin_lock_init(&cpu_buffer->reader_lock);
+        lockdep_set_class(&cpu_buffer->reader_lock, buffer->reader_lock_key);
         cpu_buffer->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
         INIT_LIST_HEAD(&cpu_buffer->pages);
 
@@ -572,12 +621,6 @@ static void rb_free_cpu_buffer(struct ring_buffer_per_cpu *cpu_buffer)
         kfree(cpu_buffer);
 }
 
-/*
- * Causes compile errors if the struct buffer_page gets bigger
- * than the struct page.
- */
-extern int ring_buffer_page_too_big(void);
-
 #ifdef CONFIG_HOTPLUG_CPU
 static int rb_cpu_notify(struct notifier_block *self,
                          unsigned long action, void *hcpu);
@@ -593,17 +636,13 @@ static int rb_cpu_notify(struct notifier_block *self,
  * when the buffer wraps. If this flag is not set, the buffer will
  * drop data when the tail hits the head.
  */
-struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
+struct ring_buffer *__ring_buffer_alloc(unsigned long size, unsigned flags,
+                                        struct lock_class_key *key)
 {
         struct ring_buffer *buffer;
         int bsize;
         int cpu;
 
-        /* Paranoid! Optimizes out when all is well */
-        if (sizeof(struct buffer_page) > sizeof(struct page))
-                ring_buffer_page_too_big();
-
-
         /* keep it in its own cache line */
         buffer = kzalloc(ALIGN(sizeof(*buffer), cache_line_size()),
                          GFP_KERNEL);
@@ -616,10 +655,11 @@ struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
         buffer->pages = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
         buffer->flags = flags;
         buffer->clock = trace_clock_local;
+        buffer->reader_lock_key = key;
 
         /* need at least two pages */
-        if (buffer->pages == 1)
-                buffer->pages++;
+        if (buffer->pages < 2)
+                buffer->pages = 2;
 
         /*
          * In case of non-hotplug cpu, if the ring-buffer is allocated
@@ -673,7 +713,7 @@ struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
         kfree(buffer);
         return NULL;
 }
-EXPORT_SYMBOL_GPL(ring_buffer_alloc);
+EXPORT_SYMBOL_GPL(__ring_buffer_alloc);
 
 /**
  * ring_buffer_free - free a ring buffer.
@@ -947,31 +987,6 @@ static inline unsigned rb_head_size(struct ring_buffer_per_cpu *cpu_buffer)
         return rb_page_commit(cpu_buffer->head_page);
 }
 
-/*
- * When the tail hits the head and the buffer is in overwrite mode,
- * the head jumps to the next page and all content on the previous
- * page is discarded. But before doing so, we update the overrun
- * variable of the buffer.
- */
-static void rb_update_overflow(struct ring_buffer_per_cpu *cpu_buffer)
-{
-        struct ring_buffer_event *event;
-        unsigned long head;
-
-        for (head = 0; head < rb_head_size(cpu_buffer);
-             head += rb_event_length(event)) {
-
-                event = __rb_page_index(cpu_buffer->head_page, head);
-                if (RB_WARN_ON(cpu_buffer, rb_null_event(event)))
-                        return;
-                /* Only count data entries */
-                if (event->type != RINGBUF_TYPE_DATA)
-                        continue;
-                cpu_buffer->overrun++;
-                cpu_buffer->entries--;
-        }
-}
-
 static inline void rb_inc_page(struct ring_buffer_per_cpu *cpu_buffer,
                                struct buffer_page **bpage)
 {
@@ -988,12 +1003,12 @@ rb_event_index(struct ring_buffer_event *event)
 {
         unsigned long addr = (unsigned long)event;
 
-        return (addr & ~PAGE_MASK) - (PAGE_SIZE - BUF_PAGE_SIZE);
+        return (addr & ~PAGE_MASK) - BUF_PAGE_HDR_SIZE;
 }
 
-static int
-rb_is_commit(struct ring_buffer_per_cpu *cpu_buffer,
-             struct ring_buffer_event *event)
+static inline int
+rb_event_is_commit(struct ring_buffer_per_cpu *cpu_buffer,
+                   struct ring_buffer_event *event)
 {
         unsigned long addr = (unsigned long)event;
         unsigned long index;
@@ -1006,31 +1021,6 @@ rb_is_commit(struct ring_buffer_per_cpu *cpu_buffer,
 }
 
 static void
-rb_set_commit_event(struct ring_buffer_per_cpu *cpu_buffer,
-                    struct ring_buffer_event *event)
-{
-        unsigned long addr = (unsigned long)event;
-        unsigned long index;
-
-        index = rb_event_index(event);
-        addr &= PAGE_MASK;
-
-        while (cpu_buffer->commit_page->page != (void *)addr) {
-                if (RB_WARN_ON(cpu_buffer,
-                          cpu_buffer->commit_page == cpu_buffer->tail_page))
-                        return;
-                cpu_buffer->commit_page->page->commit =
-                        cpu_buffer->commit_page->write;
-                rb_inc_page(cpu_buffer, &cpu_buffer->commit_page);
-                cpu_buffer->write_stamp =
-                        cpu_buffer->commit_page->page->time_stamp;
-        }
-
-        /* Now set the commit to the event's index */
-        local_set(&cpu_buffer->commit_page->page->commit, index);
-}
-
-static void
 rb_set_commit_to_write(struct ring_buffer_per_cpu *cpu_buffer)
 {
         /*
@@ -1110,28 +1100,21 @@ static void
 rb_update_event(struct ring_buffer_event *event,
                          unsigned type, unsigned length)
 {
-        event->type = type;
+        event->type_len = type;
 
         switch (type) {
 
         case RINGBUF_TYPE_PADDING:
-                break;
-
         case RINGBUF_TYPE_TIME_EXTEND:
-                event->len = DIV_ROUND_UP(RB_LEN_TIME_EXTEND, RB_ALIGNMENT);
-                break;
-
         case RINGBUF_TYPE_TIME_STAMP:
-                event->len = DIV_ROUND_UP(RB_LEN_TIME_STAMP, RB_ALIGNMENT);
                 break;
 
-        case RINGBUF_TYPE_DATA:
+        case 0:
                 length -= RB_EVNT_HDR_SIZE;
-                if (length > RB_MAX_SMALL_DATA) {
-                        event->len = 0;
+                if (length > RB_MAX_SMALL_DATA)
                         event->array[0] = length;
-                } else
-                        event->len = DIV_ROUND_UP(length, RB_ALIGNMENT);
+                else
+                        event->type_len = DIV_ROUND_UP(length, RB_ALIGNMENT);
                 break;
         default:
                 BUG();
@@ -1155,158 +1138,241 @@ static unsigned rb_calculate_event_length(unsigned length)
         return length;
 }
 
-static struct ring_buffer_event *
-__rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
-                  unsigned type, unsigned long length, u64 *ts)
+static inline void
+rb_reset_tail(struct ring_buffer_per_cpu *cpu_buffer,
+              struct buffer_page *tail_page,
+              unsigned long tail, unsigned long length)
 {
-        struct buffer_page *tail_page, *head_page, *reader_page, *commit_page;
-        unsigned long tail, write;
-        struct ring_buffer *buffer = cpu_buffer->buffer;
         struct ring_buffer_event *event;
-        unsigned long flags;
-        bool lock_taken = false;
 
-        commit_page = cpu_buffer->commit_page;
-        /* we just need to protect against interrupts */
-        barrier();
-        tail_page = cpu_buffer->tail_page;
-        write = local_add_return(length, &tail_page->write);
-        tail = write - length;
+        /*
+         * Only the event that crossed the page boundary
+         * must fill the old tail_page with padding.
+         */
+        if (tail >= BUF_PAGE_SIZE) {
+                local_sub(length, &tail_page->write);
+                return;
+        }
 
-        /* See if we shot pass the end of this buffer page */
-        if (write > BUF_PAGE_SIZE) {
-                struct buffer_page *next_page = tail_page;
+        event = __rb_page_index(tail_page, tail);
+        kmemcheck_annotate_bitfield(event, bitfield);
 
-                local_irq_save(flags);
-                /*
-                 * Since the write to the buffer is still not
-                 * fully lockless, we must be careful with NMIs.
-                 * The locks in the writers are taken when a write
-                 * crosses to a new page. The locks protect against
-                 * races with the readers (this will soon be fixed
-                 * with a lockless solution).
-                 *
-                 * Because we can not protect against NMIs, and we
-                 * want to keep traces reentrant, we need to manage
-                 * what happens when we are in an NMI.
-                 *
-                 * NMIs can happen after we take the lock.
-                 * If we are in an NMI, only take the lock
-                 * if it is not already taken. Otherwise
-                 * simply fail.
-                 */
-                if (unlikely(in_nmi())) {
-                        if (!__raw_spin_trylock(&cpu_buffer->lock))
-                                goto out_reset;
-                } else
-                        __raw_spin_lock(&cpu_buffer->lock);
+        /*
+         * If this event is bigger than the minimum size, then
+         * we need to be careful that we don't subtract the
+         * write counter enough to allow another writer to slip
+         * in on this page.
+         * We put in a discarded commit instead, to make sure
+         * that this space is not used again.
+         *
+         * If we are less than the minimum size, we don't need to
+         * worry about it.
+         */
+        if (tail > (BUF_PAGE_SIZE - RB_EVNT_MIN_SIZE)) {
+                /* No room for any events */
 
-                lock_taken = true;
+                /* Mark the rest of the page with padding */
+                rb_event_set_padding(event);
 
-                rb_inc_page(cpu_buffer, &next_page);
+                /* Set the write back to the previous setting */
+                local_sub(length, &tail_page->write);
+                return;
+        }
 
-                head_page = cpu_buffer->head_page;
-                reader_page = cpu_buffer->reader_page;
+        /* Put in a discarded event */
+        event->array[0] = (BUF_PAGE_SIZE - tail) - RB_EVNT_HDR_SIZE;
+        event->type_len = RINGBUF_TYPE_PADDING;
+        /* time delta must be non zero */
+        event->time_delta = 1;
+        /* Account for this as an entry */
+        local_inc(&tail_page->entries);
+        local_inc(&cpu_buffer->entries);
 
-                /* we grabbed the lock before incrementing */
-                if (RB_WARN_ON(cpu_buffer, next_page == reader_page))
-                        goto out_reset;
+        /* Set write to end of buffer */
+        length = (tail + length) - BUF_PAGE_SIZE;
+        local_sub(length, &tail_page->write);
+}
 
-                /*
-                 * If for some reason, we had an interrupt storm that made
-                 * it all the way around the buffer, bail, and warn
-                 * about it.
-                 */
-                if (unlikely(next_page == commit_page)) {
-                        WARN_ON_ONCE(1);
+static struct ring_buffer_event *
+rb_move_tail(struct ring_buffer_per_cpu *cpu_buffer,
+             unsigned long length, unsigned long tail,
+             struct buffer_page *commit_page,
+             struct buffer_page *tail_page, u64 *ts)
+{
+        struct buffer_page *next_page, *head_page, *reader_page;
+        struct ring_buffer *buffer = cpu_buffer->buffer;
+        bool lock_taken = false;
+        unsigned long flags;
+
+        next_page = tail_page;
+
+        local_irq_save(flags);
+        /*
+         * Since the write to the buffer is still not
+         * fully lockless, we must be careful with NMIs.
+         * The locks in the writers are taken when a write
+         * crosses to a new page. The locks protect against
+         * races with the readers (this will soon be fixed
+         * with a lockless solution).
+         *
+         * Because we can not protect against NMIs, and we
+         * want to keep traces reentrant, we need to manage
+         * what happens when we are in an NMI.
+         *
+         * NMIs can happen after we take the lock.
+         * If we are in an NMI, only take the lock
+         * if it is not already taken. Otherwise
+         * simply fail.
+         */
+        if (unlikely(in_nmi())) {
+                if (!__raw_spin_trylock(&cpu_buffer->lock)) {
+                        cpu_buffer->nmi_dropped++;
                         goto out_reset;
                 }
+        } else
+                __raw_spin_lock(&cpu_buffer->lock);
 
-                if (next_page == head_page) {
-                        if (!(buffer->flags & RB_FL_OVERWRITE))
-                                goto out_reset;
+        lock_taken = true;
 
-                        /* tail_page has not moved yet? */
-                        if (tail_page == cpu_buffer->tail_page) {
-                                /* count overflows */
-                                rb_update_overflow(cpu_buffer);
+        rb_inc_page(cpu_buffer, &next_page);
 
-                                rb_inc_page(cpu_buffer, &head_page);
-                                cpu_buffer->head_page = head_page;
-                                cpu_buffer->head_page->read = 0;
-                        }
-                }
+        head_page = cpu_buffer->head_page;
+        reader_page = cpu_buffer->reader_page;
 
-                /*
-                 * If the tail page is still the same as what we think
-                 * it is, then it is up to us to update the tail
-                 * pointer.
-                 */
+        /* we grabbed the lock before incrementing */
+        if (RB_WARN_ON(cpu_buffer, next_page == reader_page))
+                goto out_reset;
+
+        /*
+         * If for some reason, we had an interrupt storm that made
+         * it all the way around the buffer, bail, and warn
+         * about it.
+         */
+        if (unlikely(next_page == commit_page)) {
+                cpu_buffer->commit_overrun++;
+                goto out_reset;
+        }
+
+        if (next_page == head_page) {
+                if (!(buffer->flags & RB_FL_OVERWRITE))
+                        goto out_reset;
+
+                /* tail_page has not moved yet? */
                 if (tail_page == cpu_buffer->tail_page) {
-                        local_set(&next_page->write, 0);
-                        local_set(&next_page->page->commit, 0);
-                        cpu_buffer->tail_page = next_page;
+                        /* count overflows */
+                        cpu_buffer->overrun +=
+                                local_read(&head_page->entries);
 
-                        /* reread the time stamp */
-                        *ts = ring_buffer_time_stamp(buffer, cpu_buffer->cpu);
-                        cpu_buffer->tail_page->page->time_stamp = *ts;
+                        rb_inc_page(cpu_buffer, &head_page);
+                        cpu_buffer->head_page = head_page;
+                        cpu_buffer->head_page->read = 0;
                 }
+        }
 
-                /*
-                 * The actual tail page has moved forward.
-                 */
-                if (tail < BUF_PAGE_SIZE) {
-                        /* Mark the rest of the page with padding */
-                        event = __rb_page_index(tail_page, tail);
-                        rb_event_set_padding(event);
-                }
+        /*
+         * If the tail page is still the same as what we think
+         * it is, then it is up to us to update the tail
+         * pointer.
+         */
+        if (tail_page == cpu_buffer->tail_page) {
+                local_set(&next_page->write, 0);
+                local_set(&next_page->entries, 0);
+                local_set(&next_page->page->commit, 0);
+                cpu_buffer->tail_page = next_page;
+
+                /* reread the time stamp */
+                *ts = rb_time_stamp(buffer, cpu_buffer->cpu);
+                cpu_buffer->tail_page->page->time_stamp = *ts;
+        }
 
-                if (tail <= BUF_PAGE_SIZE)
-                        /* Set the write back to the previous setting */
-                        local_set(&tail_page->write, tail);
+        rb_reset_tail(cpu_buffer, tail_page, tail, length);
 
-                /*
-                 * If this was a commit entry that failed,
-                 * increment that too
-                 */
-                if (tail_page == cpu_buffer->commit_page &&
-                    tail == rb_commit_index(cpu_buffer)) {
-                        rb_set_commit_to_write(cpu_buffer);
-                }
+        __raw_spin_unlock(&cpu_buffer->lock);
+        local_irq_restore(flags);
+
+        /* fail and let the caller try again */
+        return ERR_PTR(-EAGAIN);
 
+ out_reset:
+        /* reset write */
+        rb_reset_tail(cpu_buffer, tail_page, tail, length);
+
+        if (likely(lock_taken))
                 __raw_spin_unlock(&cpu_buffer->lock);
-                local_irq_restore(flags);
+        local_irq_restore(flags);
+        return NULL;
+}
 
-                /* fail and let the caller try again */
-                return ERR_PTR(-EAGAIN);
-        }
+static struct ring_buffer_event *
+__rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
+                  unsigned type, unsigned long length, u64 *ts)
+{
+        struct buffer_page *tail_page, *commit_page;
+        struct ring_buffer_event *event;
+        unsigned long tail, write;
 
-        /* We reserved something on the buffer */
+        commit_page = cpu_buffer->commit_page;
+        /* we just need to protect against interrupts */
+        barrier();
+        tail_page = cpu_buffer->tail_page;
+        write = local_add_return(length, &tail_page->write);
+        tail = write - length;
 
-        if (RB_WARN_ON(cpu_buffer, write > BUF_PAGE_SIZE))
-                return NULL;
+        /* See if we shot pass the end of this buffer page */
+        if (write > BUF_PAGE_SIZE)
+                return rb_move_tail(cpu_buffer, length, tail,
+                                    commit_page, tail_page, ts);
+
+        /* We reserved something on the buffer */
 
         event = __rb_page_index(tail_page, tail);
+        kmemcheck_annotate_bitfield(event, bitfield);
         rb_update_event(event, type, length);
 
+        /* The passed in type is zero for DATA */
+        if (likely(!type))
+                local_inc(&tail_page->entries);
+
         /*
-         * If this is a commit and the tail is zero, then update
-         * this page's time stamp.
+         * If this is the first commit on the page, then update
+         * its timestamp.
          */
-        if (!tail && rb_is_commit(cpu_buffer, event))
-                cpu_buffer->commit_page->page->time_stamp = *ts;
+        if (!tail)
+                tail_page->page->time_stamp = *ts;
 
         return event;
+}
 
- out_reset:
-        /* reset write */
-        if (tail <= BUF_PAGE_SIZE)
-                local_set(&tail_page->write, tail);
+static inline int
+rb_try_to_discard(struct ring_buffer_per_cpu *cpu_buffer,
+                  struct ring_buffer_event *event)
+{
+        unsigned long new_index, old_index;
+        struct buffer_page *bpage;
+        unsigned long index;
+        unsigned long addr;
 
-        if (likely(lock_taken))
-                __raw_spin_unlock(&cpu_buffer->lock);
-        local_irq_restore(flags);
-        return NULL;
+        new_index = rb_event_index(event);
+        old_index = new_index + rb_event_length(event);
+        addr = (unsigned long)event;
+        addr &= PAGE_MASK;
+
+        bpage = cpu_buffer->tail_page;
+
+        if (bpage->page == (void *)addr && rb_page_write(bpage) == old_index) {
+                /*
+                 * This is on the tail page. It is possible that
+                 * a write could come in and move the tail page
+                 * and write to the next page. That is fine
+                 * because we just shorten what is on this page.
+                 */
+                index = local_cmpxchg(&bpage->write, old_index, new_index);
+                if (index == old_index)
+                        return 1;
+        }
+
+        /* could not discard */
+        return 0;
 }
 
 static int
@@ -1341,26 +1407,33 @@ rb_add_time_stamp(struct ring_buffer_per_cpu *cpu_buffer,
                 return -EAGAIN;
 
         /* Only a commited time event can update the write stamp */
-        if (rb_is_commit(cpu_buffer, event)) {
+        if (rb_event_is_commit(cpu_buffer, event)) {
                 /*
-                 * If this is the first on the page, then we need to
-                 * update the page itself, and just put in a zero.
+                 * If this is the first on the page, then it was
+                 * updated with the page itself. Try to discard it
+                 * and if we can't just make it zero.
                  */
                 if (rb_event_index(event)) {
                         event->time_delta = *delta & TS_MASK;
                         event->array[0] = *delta >> TS_SHIFT;
                 } else {
-                        cpu_buffer->commit_page->page->time_stamp = *ts;
-                        event->time_delta = 0;
-                        event->array[0] = 0;
+                        /* try to discard, since we do not need this */
+                        if (!rb_try_to_discard(cpu_buffer, event)) {
+                                /* nope, just zero it */
+                                event->time_delta = 0;
+                                event->array[0] = 0;
+                        }
                 }
                 cpu_buffer->write_stamp = *ts;
                 /* let the caller know this was the commit */
                 ret = 1;
         } else {
-                /* Darn, this is just wasted space */
-                event->time_delta = 0;
-                event->array[0] = 0;
+                /* Try to discard the event */
+                if (!rb_try_to_discard(cpu_buffer, event)) {
+                        /* Darn, this is just wasted space */
+                        event->time_delta = 0;
+                        event->array[0] = 0;
+                }
                 ret = 0;
         }
 
@@ -1369,15 +1442,56 @@ rb_add_time_stamp(struct ring_buffer_per_cpu *cpu_buffer,
         return ret;
 }
 
+static void rb_start_commit(struct ring_buffer_per_cpu *cpu_buffer)
+{
+        local_inc(&cpu_buffer->committing);
+        local_inc(&cpu_buffer->commits);
+}
+
+static void rb_end_commit(struct ring_buffer_per_cpu *cpu_buffer)
+{
+        unsigned long commits;
+
+        if (RB_WARN_ON(cpu_buffer,
+                       !local_read(&cpu_buffer->committing)))
+                return;
+
+ again:
+        commits = local_read(&cpu_buffer->commits);
+        /* synchronize with interrupts */
+        barrier();
+        if (local_read(&cpu_buffer->committing) == 1)
+                rb_set_commit_to_write(cpu_buffer);
+
+        local_dec(&cpu_buffer->committing);
+
+        /* synchronize with interrupts */
+        barrier();
+
+        /*
+         * Need to account for interrupts coming in between the
+         * updating of the commit page and the clearing of the
+         * committing counter.
+         */
+        if (unlikely(local_read(&cpu_buffer->commits) != commits) &&
+            !local_read(&cpu_buffer->committing)) {
+                local_inc(&cpu_buffer->committing);
+                goto again;
+        }
+}
+
 static struct ring_buffer_event *
 rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
-                      unsigned type, unsigned long length)
+                      unsigned long length)
 {
         struct ring_buffer_event *event;
-        u64 ts, delta;
+        u64 ts, delta = 0;
         int commit = 0;
         int nr_loops = 0;
 
+        rb_start_commit(cpu_buffer);
+
+        length = rb_calculate_event_length(length);
  again:
         /*
          * We allow for interrupts to reenter here and do a trace.
@@ -1389,9 +1503,9 @@ rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
          * Bail!
          */
         if (RB_WARN_ON(cpu_buffer, ++nr_loops > 1000))
-                return NULL;
+                goto out_fail;
 
-        ts = ring_buffer_time_stamp(cpu_buffer->buffer, cpu_buffer->cpu);
+        ts = rb_time_stamp(cpu_buffer->buffer, cpu_buffer->cpu);
 
         /*
          * Only the first commit can update the timestamp.
@@ -1401,61 +1515,82 @@ rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
          * also be made. But only the entry that did the actual
          * commit will be something other than zero.
          */
-        if (cpu_buffer->tail_page == cpu_buffer->commit_page &&
-            rb_page_write(cpu_buffer->tail_page) ==
-            rb_commit_index(cpu_buffer)) {
+        if (likely(cpu_buffer->tail_page == cpu_buffer->commit_page &&
+                   rb_page_write(cpu_buffer->tail_page) ==
+                   rb_commit_index(cpu_buffer))) {
+                u64 diff;
 
-                delta = ts - cpu_buffer->write_stamp;
+                diff = ts - cpu_buffer->write_stamp;
 
-                /* make sure this delta is calculated here */
+                /* make sure this diff is calculated here */
                 barrier();
 
                 /* Did the write stamp get updated already? */
                 if (unlikely(ts < cpu_buffer->write_stamp))
-                        delta = 0;
+                        goto get_event;
 
-                if (test_time_stamp(delta)) {
+                delta = diff;
+                if (unlikely(test_time_stamp(delta))) {
 
                         commit = rb_add_time_stamp(cpu_buffer, &ts, &delta);
-
                         if (commit == -EBUSY)
-                                return NULL;
+                                goto out_fail;
 
                         if (commit == -EAGAIN)
                                 goto again;
 
                         RB_WARN_ON(cpu_buffer, commit < 0);
                 }
-        } else
-                /* Non commits have zero deltas */
-                delta = 0;
+        }
 
-        event = __rb_reserve_next(cpu_buffer, type, length, &ts);
-        if (PTR_ERR(event) == -EAGAIN)
+ get_event:
+        event = __rb_reserve_next(cpu_buffer, 0, length, &ts);
+        if (unlikely(PTR_ERR(event) == -EAGAIN))
                 goto again;
 
-        if (!event) {
-                if (unlikely(commit))
-                        /*
-                         * Ouch! We needed a timestamp and it was commited. But
-                         * we didn't get our event reserved.
-                         */
-                        rb_set_commit_to_write(cpu_buffer);
-                return NULL;
-        }
+        if (!event)
+                goto out_fail;
 
-        /*
-         * If the timestamp was commited, make the commit our entry
-         * now so that we will update it when needed.
-         */
-        if (commit)
-                rb_set_commit_event(cpu_buffer, event);
-        else if (!rb_is_commit(cpu_buffer, event))
+        if (!rb_event_is_commit(cpu_buffer, event))
                 delta = 0;
 
         event->time_delta = delta;
 
         return event;
+
+ out_fail:
+        rb_end_commit(cpu_buffer);
+        return NULL;
+}
+
+#define TRACE_RECURSIVE_DEPTH 16
+
+static int trace_recursive_lock(void)
+{
+        current->trace_recursion++;
+
+        if (likely(current->trace_recursion < TRACE_RECURSIVE_DEPTH))
+                return 0;
+
+        /* Disable all tracing before we do anything else */
+        tracing_off_permanent();
+
+        printk_once(KERN_WARNING "Tracing recursion: depth[%ld]:"
+                    "HC[%lu]:SC[%lu]:NMI[%lu]\n",
+                    current->trace_recursion,
+                    hardirq_count() >> HARDIRQ_SHIFT,
+                    softirq_count() >> SOFTIRQ_SHIFT,
+                    in_nmi());
+
+        WARN_ON_ONCE(1);
+        return -1;
+}
+
+static void trace_recursive_unlock(void)
+{
+        WARN_ON_ONCE(!current->trace_recursion);
+
+        current->trace_recursion--;
 }
 
 static DEFINE_PER_CPU(int, rb_need_resched);
@@ -1491,6 +1626,9 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
         /* If we are tracing schedule, we don't want to recurse */
         resched = ftrace_preempt_disable();
 
+        if (trace_recursive_lock())
+                goto out_nocheck;
+
         cpu = raw_smp_processor_id();
 
         if (!cpumask_test_cpu(cpu, buffer->cpumask))
@@ -1501,11 +1639,10 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
         if (atomic_read(&cpu_buffer->record_disabled))
                 goto out;
 
-        length = rb_calculate_event_length(length);
-        if (length > BUF_PAGE_SIZE)
+        if (length > BUF_MAX_DATA_SIZE)
                 goto out;
 
-        event = rb_reserve_next_event(cpu_buffer, RINGBUF_TYPE_DATA, length);
+        event = rb_reserve_next_event(cpu_buffer, length);
         if (!event)
                 goto out;
 
@@ -1520,6 +1657,9 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
         return event;
 
  out:
+        trace_recursive_unlock();
+
+ out_nocheck:
         ftrace_preempt_enable(resched);
         return NULL;
 }
@@ -1528,15 +1668,16 @@ EXPORT_SYMBOL_GPL(ring_buffer_lock_reserve);
 static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer,
                       struct ring_buffer_event *event)
 {
-        cpu_buffer->entries++;
-
-        /* Only process further if we own the commit */
-        if (!rb_is_commit(cpu_buffer, event))
-                return;
+        local_inc(&cpu_buffer->entries);
 
-        cpu_buffer->write_stamp += event->time_delta;
+        /*
+         * The event first in the commit queue updates the
+         * time stamp.
+         */
+        if (rb_event_is_commit(cpu_buffer, event))
+                cpu_buffer->write_stamp += event->time_delta;
 
-        rb_set_commit_to_write(cpu_buffer);
+        rb_end_commit(cpu_buffer);
 }
 
 /**
@@ -1558,6 +1699,8 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,
 
         rb_commit(cpu_buffer, event);
 
+        trace_recursive_unlock();
+
         /*
          * Only the last preempt count needs to restore preemption.
          */
@@ -1570,6 +1713,93 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,
 }
 EXPORT_SYMBOL_GPL(ring_buffer_unlock_commit);
 
+static inline void rb_event_discard(struct ring_buffer_event *event)
+{
+        /* array[0] holds the actual length for the discarded event */
+        event->array[0] = rb_event_data_length(event) - RB_EVNT_HDR_SIZE;
+        event->type_len = RINGBUF_TYPE_PADDING;
+        /* time delta must be non zero */
+        if (!event->time_delta)
+                event->time_delta = 1;
+}
+
+/**
+ * ring_buffer_event_discard - discard any event in the ring buffer
+ * @event: the event to discard
+ *
+ * Sometimes a event that is in the ring buffer needs to be ignored.
+ * This function lets the user discard an event in the ring buffer
+ * and then that event will not be read later.
+ *
+ * Note, it is up to the user to be careful with this, and protect
+ * against races. If the user discards an event that has been consumed
+ * it is possible that it could corrupt the ring buffer.
+ */
+void ring_buffer_event_discard(struct ring_buffer_event *event)
+{
+        rb_event_discard(event);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_event_discard);
+
+/**
+ * ring_buffer_commit_discard - discard an event that has not been committed
+ * @buffer: the ring buffer
+ * @event: non committed event to discard
+ *
+ * This is similar to ring_buffer_event_discard but must only be
+ * performed on an event that has not been committed yet. The difference
+ * is that this will also try to free the event from the ring buffer
+ * if another event has not been added behind it.
+ *
+ * If another event has been added behind it, it will set the event
+ * up as discarded, and perform the commit.
+ *
+ * If this function is called, do not call ring_buffer_unlock_commit on
+ * the event.
+ */
+void ring_buffer_discard_commit(struct ring_buffer *buffer,
+                                struct ring_buffer_event *event)
+{
+        struct ring_buffer_per_cpu *cpu_buffer;
+        int cpu;
+
+        /* The event is discarded regardless */
+        rb_event_discard(event);
+
+        cpu = smp_processor_id();
+        cpu_buffer = buffer->buffers[cpu];
+
+        /*
+         * This must only be called if the event has not been
+         * committed yet. Thus we can assume that preemption
+         * is still disabled.
+         */
+        RB_WARN_ON(buffer, !local_read(&cpu_buffer->committing));
+
+        if (!rb_try_to_discard(cpu_buffer, event))
+                goto out;
+
+        /*
+         * The commit is still visible by the reader, so we
+         * must increment entries.
+         */
+        local_inc(&cpu_buffer->entries);
+ out:
+        rb_end_commit(cpu_buffer);
+
+        trace_recursive_unlock();
+
+        /*
+         * Only the last preempt count needs to restore preemption.
+         */
+        if (preempt_count() == 1)
+                ftrace_preempt_enable(per_cpu(rb_need_resched, cpu));
+        else
+                preempt_enable_no_resched_notrace();
+
+}
+EXPORT_SYMBOL_GPL(ring_buffer_discard_commit);
+
 /**
  * ring_buffer_write - write data to the buffer without reserving
  * @buffer: The ring buffer to write to.
@@ -1589,7 +1819,6 @@ int ring_buffer_write(struct ring_buffer *buffer,
 {
         struct ring_buffer_per_cpu *cpu_buffer;
         struct ring_buffer_event *event;
-        unsigned long event_length;
         void *body;
         int ret = -EBUSY;
         int cpu, resched;
@@ -1612,9 +1841,10 @@ int ring_buffer_write(struct ring_buffer *buffer,
         if (atomic_read(&cpu_buffer->record_disabled))
                 goto out;
 
-        event_length = rb_calculate_event_length(length);
-        event = rb_reserve_next_event(cpu_buffer,
-                                      RINGBUF_TYPE_DATA, event_length);
+        if (length > BUF_MAX_DATA_SIZE)
+                goto out;
+
+        event = rb_reserve_next_event(cpu_buffer, length);
         if (!event)
                 goto out;
 
@@ -1728,7 +1958,8 @@ unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu)
                 return 0;
 
         cpu_buffer = buffer->buffers[cpu];
-        ret = cpu_buffer->entries;
+        ret = (local_read(&cpu_buffer->entries) - cpu_buffer->overrun)
+                - cpu_buffer->read;
 
         return ret;
 }
@@ -1755,6 +1986,47 @@ unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu)
 EXPORT_SYMBOL_GPL(ring_buffer_overrun_cpu);
 
 /**
+ * ring_buffer_nmi_dropped_cpu - get the number of nmis that were dropped
+ * @buffer: The ring buffer
+ * @cpu: The per CPU buffer to get the number of overruns from
+ */
+unsigned long ring_buffer_nmi_dropped_cpu(struct ring_buffer *buffer, int cpu)
+{
+        struct ring_buffer_per_cpu *cpu_buffer;
+        unsigned long ret;
+
+        if (!cpumask_test_cpu(cpu, buffer->cpumask))
+                return 0;
+
+        cpu_buffer = buffer->buffers[cpu];
+        ret = cpu_buffer->nmi_dropped;
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_nmi_dropped_cpu);
+
+/**
+ * ring_buffer_commit_overrun_cpu - get the number of overruns caused by commits
+ * @buffer: The ring buffer
+ * @cpu: The per CPU buffer to get the number of overruns from
+ */
+unsigned long
+ring_buffer_commit_overrun_cpu(struct ring_buffer *buffer, int cpu)
+{
+        struct ring_buffer_per_cpu *cpu_buffer;
+        unsigned long ret;
+
+        if (!cpumask_test_cpu(cpu, buffer->cpumask))
+                return 0;
+
+        cpu_buffer = buffer->buffers[cpu];
+        ret = cpu_buffer->commit_overrun;
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_commit_overrun_cpu);
+
+/**
  * ring_buffer_entries - get the number of entries in a buffer
  * @buffer: The ring buffer
  *
@@ -1770,7 +2042,8 @@ unsigned long ring_buffer_entries(struct ring_buffer *buffer)
         /* if you care about this being correct, lock the buffer */
         for_each_buffer_cpu(buffer, cpu) {
                 cpu_buffer = buffer->buffers[cpu];
-                entries += cpu_buffer->entries;
+                entries += (local_read(&cpu_buffer->entries) -
+                            cpu_buffer->overrun) - cpu_buffer->read;
         }
 
         return entries;
@@ -1862,7 +2135,7 @@ rb_update_read_stamp(struct ring_buffer_per_cpu *cpu_buffer,
 {
         u64 delta;
 
-        switch (event->type) {
+        switch (event->type_len) {
         case RINGBUF_TYPE_PADDING:
                 return;
 
@@ -1893,7 +2166,7 @@ rb_update_iter_read_stamp(struct ring_buffer_iter *iter,
 {
         u64 delta;
 
-        switch (event->type) {
+        switch (event->type_len) {
         case RINGBUF_TYPE_PADDING:
                 return;
 
@@ -1966,6 +2239,7 @@ rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
         cpu_buffer->reader_page->list.prev = reader->list.prev;
 
         local_set(&cpu_buffer->reader_page->write, 0);
+        local_set(&cpu_buffer->reader_page->entries, 0);
         local_set(&cpu_buffer->reader_page->page->commit, 0);
 
         /* Make the reader page now replace the head */
@@ -2008,8 +2282,9 @@ static void rb_advance_reader(struct ring_buffer_per_cpu *cpu_buffer)
 
         event = rb_reader_event(cpu_buffer);
 
-        if (event->type == RINGBUF_TYPE_DATA || rb_discarded_event(event))
-                cpu_buffer->entries--;
+        if (event->type_len <= RINGBUF_TYPE_DATA_TYPE_LEN_MAX
+                        || rb_discarded_event(event))
+                cpu_buffer->read++;
 
         rb_update_read_stamp(cpu_buffer, event);
 
@@ -2031,8 +2306,8 @@ static void rb_advance_iter(struct ring_buffer_iter *iter)
          * Check if we are at the end of the buffer.
          */
         if (iter->head >= rb_page_size(iter->head_page)) {
-                if (RB_WARN_ON(buffer,
-                               iter->head_page == cpu_buffer->commit_page))
+                /* discarded commits can make the page empty */
+                if (iter->head_page == cpu_buffer->commit_page)
                         return;
                 rb_inc_iter(iter);
                 return;
@@ -2075,12 +2350,10 @@ rb_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
         /*
          * We repeat when a timestamp is encountered. It is possible
          * to get multiple timestamps from an interrupt entering just
-         * as one timestamp is about to be written. The max times
-         * that this can happen is the number of nested interrupts we
-         * can have.  Nesting 10 deep of interrupts is clearly
-         * an anomaly.
+         * as one timestamp is about to be written, or from discarded
+         * commits. The most that we can have is the number on a single page.
          */
-        if (RB_WARN_ON(cpu_buffer, ++nr_loops > 10))
+        if (RB_WARN_ON(cpu_buffer, ++nr_loops > RB_TIMESTAMPS_PER_PAGE))
                 return NULL;
 
         reader = rb_get_reader_page(cpu_buffer);
@@ -2089,7 +2362,7 @@ rb_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
 
         event = rb_reader_event(cpu_buffer);
 
-        switch (event->type) {
+        switch (event->type_len) {
         case RINGBUF_TYPE_PADDING:
                 if (rb_null_event(event))
                         RB_WARN_ON(cpu_buffer, 1);
@@ -2146,14 +2419,14 @@ rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
 
  again:
         /*
-         * We repeat when a timestamp is encountered. It is possible
-         * to get multiple timestamps from an interrupt entering just
-         * as one timestamp is about to be written. The max times
-         * that this can happen is the number of nested interrupts we
-         * can have. Nesting 10 deep of interrupts is clearly
-         * an anomaly.
+         * We repeat when a timestamp is encountered.
+         * We can get multiple timestamps by nested interrupts or also
+         * if filtering is on (discarding commits). Since discarding
+         * commits can be frequent we can get a lot of timestamps.
+         * But we limit them by not adding timestamps if they begin
+         * at the start of a page.
          */
-        if (RB_WARN_ON(cpu_buffer, ++nr_loops > 10))
+        if (RB_WARN_ON(cpu_buffer, ++nr_loops > RB_TIMESTAMPS_PER_PAGE))
                 return NULL;
 
         if (rb_per_cpu_empty(cpu_buffer))
@@ -2161,7 +2434,7 @@ rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
 
         event = rb_iter_head_event(iter);
 
-        switch (event->type) {
+        switch (event->type_len) {
         case RINGBUF_TYPE_PADDING:
                 if (rb_null_event(event)) {
                         rb_inc_iter(iter);
@@ -2196,6 +2469,21 @@ rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
 }
 EXPORT_SYMBOL_GPL(ring_buffer_iter_peek);
 
+static inline int rb_ok_to_lock(void)
+{
+        /*
+         * If an NMI die dumps out the content of the ring buffer
+         * do not grab locks. We also permanently disable the ring
+         * buffer too. A one time deal is all you get from reading
+         * the ring buffer from an NMI.
+         */
+        if (likely(!in_nmi() && !oops_in_progress))
+                return 1;
+
+        tracing_off_permanent();
+        return 0;
+}
+
 /**
  * ring_buffer_peek - peek at the next event to be read
  * @buffer: The ring buffer to read
@@ -2211,16 +2499,22 @@ ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
         struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
         struct ring_buffer_event *event;
         unsigned long flags;
+        int dolock;
 
         if (!cpumask_test_cpu(cpu, buffer->cpumask))
                 return NULL;
 
+        dolock = rb_ok_to_lock();
  again:
-        spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+        local_irq_save(flags);
+        if (dolock)
+                spin_lock(&cpu_buffer->reader_lock);
         event = rb_buffer_peek(buffer, cpu, ts);
-        spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+        if (dolock)
+                spin_unlock(&cpu_buffer->reader_lock);
+        local_irq_restore(flags);
 
-        if (event && event->type == RINGBUF_TYPE_PADDING) {
+        if (event && event->type_len == RINGBUF_TYPE_PADDING) {
                 cpu_relax();
                 goto again;
         }
@@ -2248,7 +2542,7 @@ ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
         event = rb_iter_peek(iter, ts);
         spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 
-        if (event && event->type == RINGBUF_TYPE_PADDING) {
+        if (event && event->type_len == RINGBUF_TYPE_PADDING) {
                 cpu_relax();
                 goto again;
         }
@@ -2270,6 +2564,9 @@ ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)
         struct ring_buffer_per_cpu *cpu_buffer;
         struct ring_buffer_event *event = NULL;
         unsigned long flags;
+        int dolock;
+
+        dolock = rb_ok_to_lock();
 
  again:
         /* might be called in atomic */
@@ -2279,7 +2576,9 @@ ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)
                 goto out;
 
         cpu_buffer = buffer->buffers[cpu];
-        spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+        local_irq_save(flags);
+        if (dolock)
+                spin_lock(&cpu_buffer->reader_lock);
 
         event = rb_buffer_peek(buffer, cpu, ts);
         if (!event)
@@ -2288,12 +2587,14 @@ ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)
         rb_advance_reader(cpu_buffer);
 
  out_unlock:
-        spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+        if (dolock)
+                spin_unlock(&cpu_buffer->reader_lock);
+        local_irq_restore(flags);
 
  out:
         preempt_enable();
 
-        if (event && event->type == RINGBUF_TYPE_PADDING) {
+        if (event && event->type_len == RINGBUF_TYPE_PADDING) {
                 cpu_relax();
                 goto again;
         }
@@ -2386,7 +2687,7 @@ ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts)
  out:
         spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 
-        if (event && event->type == RINGBUF_TYPE_PADDING) {
+        if (event && event->type_len == RINGBUF_TYPE_PADDING) {
                 cpu_relax();
                 goto again;
         }
@@ -2411,6 +2712,7 @@ rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
         cpu_buffer->head_page
                 = list_entry(cpu_buffer->pages.next, struct buffer_page, list);
         local_set(&cpu_buffer->head_page->write, 0);
+        local_set(&cpu_buffer->head_page->entries, 0);
         local_set(&cpu_buffer->head_page->page->commit, 0);
 
         cpu_buffer->head_page->read = 0;
@@ -2420,11 +2722,17 @@ rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
 
         INIT_LIST_HEAD(&cpu_buffer->reader_page->list);
         local_set(&cpu_buffer->reader_page->write, 0);
+        local_set(&cpu_buffer->reader_page->entries, 0);
         local_set(&cpu_buffer->reader_page->page->commit, 0);
         cpu_buffer->reader_page->read = 0;
 
+        cpu_buffer->nmi_dropped = 0;
+        cpu_buffer->commit_overrun = 0;
         cpu_buffer->overrun = 0;
-        cpu_buffer->entries = 0;
+        cpu_buffer->read = 0;
+        local_set(&cpu_buffer->entries, 0);
+        local_set(&cpu_buffer->committing, 0);
+        local_set(&cpu_buffer->commits, 0);
 
         cpu_buffer->write_stamp = 0;
         cpu_buffer->read_stamp = 0;
@@ -2443,6 +2751,8 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
         if (!cpumask_test_cpu(cpu, buffer->cpumask))
                 return;
 
+        atomic_inc(&cpu_buffer->record_disabled);
+
         spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
 
         __raw_spin_lock(&cpu_buffer->lock);
@@ -2452,6 +2762,8 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
         __raw_spin_unlock(&cpu_buffer->lock);
 
         spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+
+        atomic_dec(&cpu_buffer->record_disabled);
 }
 EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);
 
@@ -2475,12 +2787,25 @@ EXPORT_SYMBOL_GPL(ring_buffer_reset);
 int ring_buffer_empty(struct ring_buffer *buffer)
 {
         struct ring_buffer_per_cpu *cpu_buffer;
+        unsigned long flags;
+        int dolock;
         int cpu;
+        int ret;
+
+        dolock = rb_ok_to_lock();
 
         /* yes this is racy, but if you don't like the race, lock the buffer */
         for_each_buffer_cpu(buffer, cpu) {
                 cpu_buffer = buffer->buffers[cpu];
-                if (!rb_per_cpu_empty(cpu_buffer))
+                local_irq_save(flags);
+                if (dolock)
+                        spin_lock(&cpu_buffer->reader_lock);
+                ret = rb_per_cpu_empty(cpu_buffer);
+                if (dolock)
+                        spin_unlock(&cpu_buffer->reader_lock);
+                local_irq_restore(flags);
+
+                if (!ret)
                         return 0;
         }
 
@@ -2496,14 +2821,23 @@ EXPORT_SYMBOL_GPL(ring_buffer_empty);
 int ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu)
 {
         struct ring_buffer_per_cpu *cpu_buffer;
+        unsigned long flags;
+        int dolock;
         int ret;
 
         if (!cpumask_test_cpu(cpu, buffer->cpumask))
                 return 1;
 
+        dolock = rb_ok_to_lock();
+
         cpu_buffer = buffer->buffers[cpu];
+        local_irq_save(flags);
+        if (dolock)
+                spin_lock(&cpu_buffer->reader_lock);
         ret = rb_per_cpu_empty(cpu_buffer);
-
+        if (dolock)
+                spin_unlock(&cpu_buffer->reader_lock);
+        local_irq_restore(flags);
 
         return ret;
 }
@@ -2578,28 +2912,6 @@ out:
 }
 EXPORT_SYMBOL_GPL(ring_buffer_swap_cpu);
 
-static void rb_remove_entries(struct ring_buffer_per_cpu *cpu_buffer,
-                              struct buffer_data_page *bpage,
-                              unsigned int offset)
-{
-        struct ring_buffer_event *event;
-        unsigned long head;
-
-        __raw_spin_lock(&cpu_buffer->lock);
-        for (head = offset; head < local_read(&bpage->commit);
-             head += rb_event_length(event)) {
-
-                event = __rb_data_page_index(bpage, head);
-                if (RB_WARN_ON(cpu_buffer, rb_null_event(event)))
-                        return;
-                /* Only count data entries */
-                if (event->type != RINGBUF_TYPE_DATA)
-                        continue;
-                cpu_buffer->entries--;
-        }
-        __raw_spin_unlock(&cpu_buffer->lock);
-}
-
 /**
  * ring_buffer_alloc_read_page - allocate a page to read from buffer
  * @buffer: the buffer to allocate for.
@@ -2630,6 +2942,7 @@ void *ring_buffer_alloc_read_page(struct ring_buffer *buffer)
 
         return bpage;
 }
+EXPORT_SYMBOL_GPL(ring_buffer_alloc_read_page);
 
 /**
  * ring_buffer_free_read_page - free an allocated read page
@@ -2642,6 +2955,7 @@ void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data)
 {
         free_page((unsigned long)data);
 }
+EXPORT_SYMBOL_GPL(ring_buffer_free_read_page);
 
 /**
  * ring_buffer_read_page - extract a page from the ring buffer
@@ -2768,16 +3082,17 @@ int ring_buffer_read_page(struct ring_buffer *buffer,
                 /* we copied everything to the beginning */
                 read = 0;
         } else {
+                /* update the entry counter */
+                cpu_buffer->read += local_read(&reader->entries);
+
                 /* swap the pages */
                 rb_init_page(bpage);
                 bpage = reader->page;
                 reader->page = *data_page;
                 local_set(&reader->write, 0);
+                local_set(&reader->entries, 0);
                 reader->read = 0;
                 *data_page = bpage;
-
-                /* update the entry counter */
-                rb_remove_entries(cpu_buffer, bpage, read);
         }
         ret = read;
 
@@ -2787,6 +3102,7 @@ int ring_buffer_read_page(struct ring_buffer *buffer,
  out:
         return ret;
 }
+EXPORT_SYMBOL_GPL(ring_buffer_read_page);
 
 static ssize_t
 rb_simple_read(struct file *filp, char __user *ubuf,
@@ -2845,14 +3161,11 @@ static const struct file_operations rb_simple_fops = {
 static __init int rb_init_debugfs(void)
 {
         struct dentry *d_tracer;
-        struct dentry *entry;
 
         d_tracer = tracing_init_dentry();
 
-        entry = debugfs_create_file("tracing_on", 0644, d_tracer,
-                                    &ring_buffer_flags, &rb_simple_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'tracing_on' entry\n");
+        trace_create_file("tracing_on", 0644, d_tracer,
+                            &ring_buffer_flags, &rb_simple_fops);
 
         return 0;
 }
@@ -2870,7 +3183,7 @@ static int rb_cpu_notify(struct notifier_block *self,
         switch (action) {
         case CPU_UP_PREPARE:
         case CPU_UP_PREPARE_FROZEN:
-                if (cpu_isset(cpu, *buffer->cpumask))
+                if (cpumask_test_cpu(cpu, buffer->cpumask))
                         return NOTIFY_OK;
 
                 buffer->buffers[cpu] =
@@ -2881,7 +3194,7 @@ static int rb_cpu_notify(struct notifier_block *self,
                         return NOTIFY_OK;
                 }
                 smp_wmb();
-                cpu_set(cpu, *buffer->cpumask);
+                cpumask_set_cpu(cpu, buffer->cpumask);
                 break;
         case CPU_DOWN_PREPARE:
         case CPU_DOWN_PREPARE_FROZEN:
diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c
new file mode 100644
index 000000000000..573d3cc762c3
--- /dev/null
+++ b/kernel/trace/ring_buffer_benchmark.c
@@ -0,0 +1,419 @@
+/*
+ * ring buffer tester and benchmark
+ *
+ * Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com>
+ */
+#include <linux/ring_buffer.h>
+#include <linux/completion.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/time.h>
+
+struct rb_page {
+        u64             ts;
+        local_t         commit;
+        char            data[4080];
+};
+
+/* run time and sleep time in seconds */
+#define RUN_TIME        10
+#define SLEEP_TIME      10
+
+/* number of events for writer to wake up the reader */
+static int wakeup_interval = 100;
+
+static int reader_finish;
+static struct completion read_start;
+static struct completion read_done;
+
+static struct ring_buffer *buffer;
+static struct task_struct *producer;
+static struct task_struct *consumer;
+static unsigned long read;
+
+static int disable_reader;
+module_param(disable_reader, uint, 0644);
+MODULE_PARM_DESC(disable_reader, "only run producer");
+
+static int read_events;
+
+static int kill_test;
+
+#define KILL_TEST()                             \
+        do {                                    \
+                if (!kill_test) {               \
+                        kill_test = 1;          \
+                        WARN_ON(1);             \
+                }                               \
+        } while (0)
+
+enum event_status {
+        EVENT_FOUND,
+        EVENT_DROPPED,
+};
+
+static enum event_status read_event(int cpu)
+{
+        struct ring_buffer_event *event;
+        int *entry;
+        u64 ts;
+
+        event = ring_buffer_consume(buffer, cpu, &ts);
+        if (!event)
+                return EVENT_DROPPED;
+
+        entry = ring_buffer_event_data(event);
+        if (*entry != cpu) {
+                KILL_TEST();
+                return EVENT_DROPPED;
+        }
+
+        read++;
+        return EVENT_FOUND;
+}
+
+static enum event_status read_page(int cpu)
+{
+        struct ring_buffer_event *event;
+        struct rb_page *rpage;
+        unsigned long commit;
+        void *bpage;
+        int *entry;
+        int ret;
+        int inc;
+        int i;
+
+        bpage = ring_buffer_alloc_read_page(buffer);
+        if (!bpage)
+                return EVENT_DROPPED;
+
+        ret = ring_buffer_read_page(buffer, &bpage, PAGE_SIZE, cpu, 1);
+        if (ret >= 0) {
+                rpage = bpage;
+                commit = local_read(&rpage->commit);
+                for (i = 0; i < commit && !kill_test; i += inc) {
+
+                        if (i >= (PAGE_SIZE - offsetof(struct rb_page, data))) {
+                                KILL_TEST();
+                                break;
+                        }
+
+                        inc = -1;
+                        event = (void *)&rpage->data[i];
+                        switch (event->type_len) {
+                        case RINGBUF_TYPE_PADDING:
+                                /* failed writes may be discarded events */
+                                if (!event->time_delta)
+                                        KILL_TEST();
+                                inc = event->array[0] + 4;
+                                break;
+                        case RINGBUF_TYPE_TIME_EXTEND:
+                                inc = 8;
+                                break;
+                        case 0:
+                                entry = ring_buffer_event_data(event);
+                                if (*entry != cpu) {
+                                        KILL_TEST();
+                                        break;
+                                }
+                                read++;
+                                if (!event->array[0]) {
+                                        KILL_TEST();
+                                        break;
+                                }
+                                inc = event->array[0] + 4;
+                                break;
+                        default:
+                                entry = ring_buffer_event_data(event);
+                                if (*entry != cpu) {
+                                        KILL_TEST();
+                                        break;
+                                }
+                                read++;
+                                inc = ((event->type_len + 1) * 4);
+                        }
+                        if (kill_test)
+                                break;
+
+                        if (inc <= 0) {
+                                KILL_TEST();
+                                break;
+                        }
+                }
+        }
+        ring_buffer_free_read_page(buffer, bpage);
+
+        if (ret < 0)
+                return EVENT_DROPPED;
+        return EVENT_FOUND;
+}
+
+static void ring_buffer_consumer(void)
+{
+        /* toggle between reading pages and events */
+        read_events ^= 1;
+
+        read = 0;
+        while (!reader_finish && !kill_test) {
+                int found;
+
+                do {
+                        int cpu;
+
+                        found = 0;
+                        for_each_online_cpu(cpu) {
+                                enum event_status stat;
+
+                                if (read_events)
+                                        stat = read_event(cpu);
+                                else
+                                        stat = read_page(cpu);
+
+                                if (kill_test)
+                                        break;
+                                if (stat == EVENT_FOUND)
+                                        found = 1;
+                        }
+                } while (found && !kill_test);
+
+                set_current_state(TASK_INTERRUPTIBLE);
+                if (reader_finish)
+                        break;
+
+                schedule();
+                __set_current_state(TASK_RUNNING);
+        }
+        reader_finish = 0;
+        complete(&read_done);
+}
+
+static void ring_buffer_producer(void)
+{
+        struct timeval start_tv;
+        struct timeval end_tv;
+        unsigned long long time;
+        unsigned long long entries;
+        unsigned long long overruns;
+        unsigned long missed = 0;
+        unsigned long hit = 0;
+        unsigned long avg;
+        int cnt = 0;
+
+        /*
+         * Hammer the buffer for 10 secs (this may
+         * make the system stall)
+         */
+        trace_printk("Starting ring buffer hammer\n");
+        do_gettimeofday(&start_tv);
+        do {
+                struct ring_buffer_event *event;
+                int *entry;
+
+                event = ring_buffer_lock_reserve(buffer, 10);
+                if (!event) {
+                        missed++;
+                } else {
+                        hit++;
+                        entry = ring_buffer_event_data(event);
+                        *entry = smp_processor_id();
+                        ring_buffer_unlock_commit(buffer, event);
+                }
+                do_gettimeofday(&end_tv);
+
+                cnt++;
+                if (consumer && !(cnt % wakeup_interval))
+                        wake_up_process(consumer);
+
+#ifndef CONFIG_PREEMPT
+                /*
+                 * If we are a non preempt kernel, the 10 second run will
+                 * stop everything while it runs. Instead, we will call
+                 * cond_resched and also add any time that was lost by a
+                 * rescedule.
+                 *
+                 * Do a cond resched at the same frequency we would wake up
+                 * the reader.
+                 */
+                if (cnt % wakeup_interval)
+                        cond_resched();
+#endif
+
+        } while (end_tv.tv_sec < (start_tv.tv_sec + RUN_TIME) && !kill_test);
+        trace_printk("End ring buffer hammer\n");
+
+        if (consumer) {
+                /* Init both completions here to avoid races */
+                init_completion(&read_start);
+                init_completion(&read_done);
+                /* the completions must be visible before the finish var */
+                smp_wmb();
+                reader_finish = 1;
+                /* finish var visible before waking up the consumer */
+                smp_wmb();
+                wake_up_process(consumer);
+                wait_for_completion(&read_done);
+        }
+
+        time = end_tv.tv_sec - start_tv.tv_sec;
+        time *= USEC_PER_SEC;
+        time += (long long)((long)end_tv.tv_usec - (long)start_tv.tv_usec);
+
+        entries = ring_buffer_entries(buffer);
+        overruns = ring_buffer_overruns(buffer);
+
+        if (kill_test)
+                trace_printk("ERROR!\n");
+        trace_printk("Time:     %lld (usecs)\n", time);
+        trace_printk("Overruns: %lld\n", overruns);
+        if (disable_reader)
+                trace_printk("Read:     (reader disabled)\n");
+        else
+                trace_printk("Read:     %ld  (by %s)\n", read,
+                        read_events ? "events" : "pages");
+        trace_printk("Entries:  %lld\n", entries);
+        trace_printk("Total:    %lld\n", entries + overruns + read);
+        trace_printk("Missed:   %ld\n", missed);
+        trace_printk("Hit:      %ld\n", hit);
+
+        /* Convert time from usecs to millisecs */
+        do_div(time, USEC_PER_MSEC);
+        if (time)
+                hit /= (long)time;
+        else
+                trace_printk("TIME IS ZERO??\n");
+
+        trace_printk("Entries per millisec: %ld\n", hit);
+
+        if (hit) {
+                /* Calculate the average time in nanosecs */
+                avg = NSEC_PER_MSEC / hit;
+                trace_printk("%ld ns per entry\n", avg);
+        }
+
+        if (missed) {
+                if (time)
+                        missed /= (long)time;
+
+                trace_printk("Total iterations per millisec: %ld\n",
+                             hit + missed);
+
+                /* it is possible that hit + missed will overflow and be zero */
+                if (!(hit + missed)) {
+                        trace_printk("hit + missed overflowed and totalled zero!\n");
+                        hit--; /* make it non zero */
+                }
+
+                /* Caculate the average time in nanosecs */
+                avg = NSEC_PER_MSEC / (hit + missed);
+                trace_printk("%ld ns per entry\n", avg);
+        }
+}
+
+static void wait_to_die(void)
+{
+        set_current_state(TASK_INTERRUPTIBLE);
+        while (!kthread_should_stop()) {
+                schedule();
+                set_current_state(TASK_INTERRUPTIBLE);
+        }
+        __set_current_state(TASK_RUNNING);
+}
+
+static int ring_buffer_consumer_thread(void *arg)
+{
+        while (!kthread_should_stop() && !kill_test) {
+                complete(&read_start);
+
+                ring_buffer_consumer();
+
+                set_current_state(TASK_INTERRUPTIBLE);
+                if (kthread_should_stop() || kill_test)
+                        break;
+
+                schedule();
+                __set_current_state(TASK_RUNNING);
+        }
+        __set_current_state(TASK_RUNNING);
+
+        if (kill_test)
+                wait_to_die();
+
+        return 0;
+}
+
+static int ring_buffer_producer_thread(void *arg)
+{
+        init_completion(&read_start);
+
+        while (!kthread_should_stop() && !kill_test) {
+                ring_buffer_reset(buffer);
+
+                if (consumer) {
+                        smp_wmb();
+                        wake_up_process(consumer);
+                        wait_for_completion(&read_start);
+                }
+
+                ring_buffer_producer();
+
+                trace_printk("Sleeping for 10 secs\n");
+                set_current_state(TASK_INTERRUPTIBLE);
+                schedule_timeout(HZ * SLEEP_TIME);
+                __set_current_state(TASK_RUNNING);
+        }
+
+        if (kill_test)
+                wait_to_die();
+
+        return 0;
+}
+
+static int __init ring_buffer_benchmark_init(void)
+{
+        int ret;
+
+        /* make a one meg buffer in overwite mode */
+        buffer = ring_buffer_alloc(1000000, RB_FL_OVERWRITE);
+        if (!buffer)
+                return -ENOMEM;
+
+        if (!disable_reader) {
+                consumer = kthread_create(ring_buffer_consumer_thread,
+                                          NULL, "rb_consumer");
+                ret = PTR_ERR(consumer);
+                if (IS_ERR(consumer))
+                        goto out_fail;
+        }
+
+        producer = kthread_run(ring_buffer_producer_thread,
+                               NULL, "rb_producer");
+        ret = PTR_ERR(producer);
+
+        if (IS_ERR(producer))
+                goto out_kill;
+
+        return 0;
+
+ out_kill:
+        if (consumer)
+                kthread_stop(consumer);
+
+ out_fail:
+        ring_buffer_free(buffer);
+        return ret;
+}
+
+static void __exit ring_buffer_benchmark_exit(void)
+{
+        kthread_stop(producer);
+        if (consumer)
+                kthread_stop(consumer);
+        ring_buffer_free(buffer);
+}
+
+module_init(ring_buffer_benchmark_init);
+module_exit(ring_buffer_benchmark_exit);
+
+MODULE_AUTHOR("Steven Rostedt");
+MODULE_DESCRIPTION("ring_buffer_benchmark");
+MODULE_LICENSE("GPL");
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a884c09006c4..076fa6f0ee48 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -171,6 +171,13 @@ static struct trace_array	global_trace;
 
 static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu);
 
+int filter_current_check_discard(struct ftrace_event_call *call, void *rec,
+                                 struct ring_buffer_event *event)
+{
+        return filter_check_discard(call, rec, global_trace.buffer, event);
+}
+EXPORT_SYMBOL_GPL(filter_current_check_discard);
+
 cycle_t ftrace_now(int cpu)
 {
         u64 ts;
@@ -255,7 +262,8 @@ static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
 
 /* trace_flags holds trace_options default values */
 unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
-        TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME;
+        TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME |
+        TRACE_ITER_GRAPH_TIME;
 
 /**
  * trace_wake_up - wake up tasks waiting for trace input
@@ -317,6 +325,7 @@ static const char *trace_options[] = {
         "latency-format",
         "global-clock",
         "sleep-time",
+        "graph-time",
         NULL
 };
 
@@ -335,7 +344,7 @@ static raw_spinlock_t ftrace_max_lock =
 /*
  * Copy the new maximum trace into the separate maximum-trace
  * structure. (this way the maximum trace is permanently saved,
- * for later retrieval via /debugfs/tracing/latency_trace)
+ * for later retrieval via /sys/kernel/debug/tracing/latency_trace)
  */
 static void
 __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
@@ -402,17 +411,6 @@ static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt)
         return cnt;
 }
 
-static void
-trace_print_seq(struct seq_file *m, struct trace_seq *s)
-{
-        int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
-
-        s->buffer[len] = 0;
-        seq_puts(m, s->buffer);
-
-        trace_seq_init(s);
-}
-
 /**
  * update_max_tr - snapshot all trace buffers from global_trace to max_tr
  * @tr: tracer
@@ -641,6 +639,16 @@ void tracing_reset_online_cpus(struct trace_array *tr)
                 tracing_reset(tr, cpu);
 }
 
+void tracing_reset_current(int cpu)
+{
+        tracing_reset(&global_trace, cpu);
+}
+
+void tracing_reset_current_online_cpus(void)
+{
+        tracing_reset_online_cpus(&global_trace);
+}
+
 #define SAVED_CMDLINES 128
 #define NO_CMDLINE_MAP UINT_MAX
 static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1];
@@ -800,6 +808,7 @@ void trace_find_cmdline(int pid, char comm[])
                 return;
         }
 
+        preempt_disable();
         __raw_spin_lock(&trace_cmdline_lock);
         map = map_pid_to_cmdline[pid];
         if (map != NO_CMDLINE_MAP)
@@ -808,6 +817,7 @@ void trace_find_cmdline(int pid, char comm[])
                 strcpy(comm, "<...>");
 
         __raw_spin_unlock(&trace_cmdline_lock);
+        preempt_enable();
 }
 
 void tracing_record_cmdline(struct task_struct *tsk)
@@ -840,7 +850,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
 }
 
 struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr,
-                                                    unsigned char type,
+                                                    int type,
                                                     unsigned long len,
                                                     unsigned long flags, int pc)
 {
@@ -883,30 +893,40 @@ void trace_buffer_unlock_commit(struct trace_array *tr,
 }
 
 struct ring_buffer_event *
-trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,
+trace_current_buffer_lock_reserve(int type, unsigned long len,
                                   unsigned long flags, int pc)
 {
         return trace_buffer_lock_reserve(&global_trace,
                                          type, len, flags, pc);
 }
+EXPORT_SYMBOL_GPL(trace_current_buffer_lock_reserve);
 
 void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
                                         unsigned long flags, int pc)
 {
-        return __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 1);
+        __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 1);
 }
+EXPORT_SYMBOL_GPL(trace_current_buffer_unlock_commit);
 
 void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,
                                         unsigned long flags, int pc)
 {
-        return __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 0);
+        __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 0);
+}
+EXPORT_SYMBOL_GPL(trace_nowake_buffer_unlock_commit);
+
+void trace_current_buffer_discard_commit(struct ring_buffer_event *event)
+{
+        ring_buffer_discard_commit(global_trace.buffer, event);
 }
+EXPORT_SYMBOL_GPL(trace_current_buffer_discard_commit);
 
 void
 trace_function(struct trace_array *tr,
                unsigned long ip, unsigned long parent_ip, unsigned long flags,
                int pc)
 {
+        struct ftrace_event_call *call = &event_function;
         struct ring_buffer_event *event;
         struct ftrace_entry *entry;
 
@@ -921,7 +941,9 @@ trace_function(struct trace_array *tr,
         entry   = ring_buffer_event_data(event);
         entry->ip                       = ip;
         entry->parent_ip                = parent_ip;
-        ring_buffer_unlock_commit(tr->buffer, event);
+
+        if (!filter_check_discard(call, entry, tr->buffer, event))
+                ring_buffer_unlock_commit(tr->buffer, event);
 }
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
@@ -930,6 +952,7 @@ static int __trace_graph_entry(struct trace_array *tr,
                                 unsigned long flags,
                                 int pc)
 {
+        struct ftrace_event_call *call = &event_funcgraph_entry;
         struct ring_buffer_event *event;
         struct ftrace_graph_ent_entry *entry;
 
@@ -942,7 +965,8 @@ static int __trace_graph_entry(struct trace_array *tr,
                 return 0;
         entry   = ring_buffer_event_data(event);
         entry->graph_ent                        = *trace;
-        ring_buffer_unlock_commit(global_trace.buffer, event);
+        if (!filter_current_check_discard(call, entry, event))
+                ring_buffer_unlock_commit(global_trace.buffer, event);
 
         return 1;
 }
@@ -952,6 +976,7 @@ static void __trace_graph_return(struct trace_array *tr,
                                 unsigned long flags,
                                 int pc)
 {
+        struct ftrace_event_call *call = &event_funcgraph_exit;
         struct ring_buffer_event *event;
         struct ftrace_graph_ret_entry *entry;
 
@@ -964,7 +989,8 @@ static void __trace_graph_return(struct trace_array *tr,
                 return;
         entry   = ring_buffer_event_data(event);
         entry->ret                              = *trace;
-        ring_buffer_unlock_commit(global_trace.buffer, event);
+        if (!filter_current_check_discard(call, entry, event))
+                ring_buffer_unlock_commit(global_trace.buffer, event);
 }
 #endif
 
@@ -982,6 +1008,7 @@ static void __ftrace_trace_stack(struct trace_array *tr,
                                  int skip, int pc)
 {
 #ifdef CONFIG_STACKTRACE
+        struct ftrace_event_call *call = &event_kernel_stack;
         struct ring_buffer_event *event;
         struct stack_entry *entry;
         struct stack_trace trace;
@@ -999,7 +1026,8 @@ static void __ftrace_trace_stack(struct trace_array *tr,
         trace.entries           = entry->caller;
 
         save_stack_trace(&trace);
-        ring_buffer_unlock_commit(tr->buffer, event);
+        if (!filter_check_discard(call, entry, tr->buffer, event))
+                ring_buffer_unlock_commit(tr->buffer, event);
 #endif
 }
 
@@ -1024,6 +1052,7 @@ static void ftrace_trace_userstack(struct trace_array *tr,
                                    unsigned long flags, int pc)
 {
 #ifdef CONFIG_STACKTRACE
+        struct ftrace_event_call *call = &event_user_stack;
         struct ring_buffer_event *event;
         struct userstack_entry *entry;
         struct stack_trace trace;
@@ -1045,7 +1074,8 @@ static void ftrace_trace_userstack(struct trace_array *tr,
         trace.entries           = entry->caller;
 
         save_stack_trace_user(&trace);
-        ring_buffer_unlock_commit(tr->buffer, event);
+        if (!filter_check_discard(call, entry, tr->buffer, event))
+                ring_buffer_unlock_commit(tr->buffer, event);
 #endif
 }
 
@@ -1089,6 +1119,7 @@ tracing_sched_switch_trace(struct trace_array *tr,
                            struct task_struct *next,
                            unsigned long flags, int pc)
 {
+        struct ftrace_event_call *call = &event_context_switch;
         struct ring_buffer_event *event;
         struct ctx_switch_entry *entry;
 
@@ -1104,7 +1135,9 @@ tracing_sched_switch_trace(struct trace_array *tr,
         entry->next_prio                = next->prio;
         entry->next_state               = next->state;
         entry->next_cpu = task_cpu(next);
-        trace_buffer_unlock_commit(tr, event, flags, pc);
+
+        if (!filter_check_discard(call, entry, tr->buffer, event))
+                trace_buffer_unlock_commit(tr, event, flags, pc);
 }
 
 void
@@ -1113,6 +1146,7 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
                            struct task_struct *curr,
                            unsigned long flags, int pc)
 {
+        struct ftrace_event_call *call = &event_wakeup;
         struct ring_buffer_event *event;
         struct ctx_switch_entry *entry;
 
@@ -1129,7 +1163,8 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
         entry->next_state               = wakee->state;
         entry->next_cpu                 = task_cpu(wakee);
 
-        ring_buffer_unlock_commit(tr->buffer, event);
+        if (!filter_check_discard(call, entry, tr->buffer, event))
+                ring_buffer_unlock_commit(tr->buffer, event);
         ftrace_trace_stack(tr, flags, 6, pc);
         ftrace_trace_userstack(tr, flags, pc);
 }
@@ -1230,11 +1265,13 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
                 (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
         static u32 trace_buf[TRACE_BUF_SIZE];
 
+        struct ftrace_event_call *call = &event_bprint;
         struct ring_buffer_event *event;
         struct trace_array *tr = &global_trace;
         struct trace_array_cpu *data;
         struct bprint_entry *entry;
         unsigned long flags;
+        int disable;
         int resched;
         int cpu, len = 0, size, pc;
 
@@ -1249,7 +1286,8 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
         cpu = raw_smp_processor_id();
         data = tr->data[cpu];
 
-        if (unlikely(atomic_read(&data->disabled)))
+        disable = atomic_inc_return(&data->disabled);
+        if (unlikely(disable != 1))
                 goto out;
 
         /* Lockdep uses trace_printk for lock tracing */
@@ -1269,13 +1307,15 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
         entry->fmt                      = fmt;
 
         memcpy(entry->buf, trace_buf, sizeof(u32) * len);
-        ring_buffer_unlock_commit(tr->buffer, event);
+        if (!filter_check_discard(call, entry, tr->buffer, event))
+                ring_buffer_unlock_commit(tr->buffer, event);
 
 out_unlock:
         __raw_spin_unlock(&trace_buf_lock);
         local_irq_restore(flags);
 
 out:
+        atomic_dec_return(&data->disabled);
         ftrace_preempt_enable(resched);
         unpause_graph_tracing();
 
@@ -1288,12 +1328,14 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
         static raw_spinlock_t trace_buf_lock = __RAW_SPIN_LOCK_UNLOCKED;
         static char trace_buf[TRACE_BUF_SIZE];
 
+        struct ftrace_event_call *call = &event_print;
         struct ring_buffer_event *event;
         struct trace_array *tr = &global_trace;
         struct trace_array_cpu *data;
         int cpu, len = 0, size, pc;
         struct print_entry *entry;
         unsigned long irq_flags;
+        int disable;
 
         if (tracing_disabled || tracing_selftest_running)
                 return 0;
@@ -1303,7 +1345,8 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
         cpu = raw_smp_processor_id();
         data = tr->data[cpu];
 
-        if (unlikely(atomic_read(&data->disabled)))
+        disable = atomic_inc_return(&data->disabled);
+        if (unlikely(disable != 1))
                 goto out;
 
         pause_graph_tracing();
@@ -1323,13 +1366,15 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
 
         memcpy(&entry->buf, trace_buf, len);
         entry->buf[len] = 0;
-        ring_buffer_unlock_commit(tr->buffer, event);
+        if (!filter_check_discard(call, entry, tr->buffer, event))
+                ring_buffer_unlock_commit(tr->buffer, event);
 
  out_unlock:
         __raw_spin_unlock(&trace_buf_lock);
         raw_local_irq_restore(irq_flags);
         unpause_graph_tracing();
  out:
+        atomic_dec_return(&data->disabled);
         preempt_enable_notrace();
 
         return len;
@@ -1526,12 +1571,14 @@ static void *s_start(struct seq_file *m, loff_t *pos)
                 p = s_next(m, p, &l);
         }
 
+        trace_event_read_lock();
         return p;
 }
 
 static void s_stop(struct seq_file *m, void *p)
 {
         atomic_dec(&trace_record_cmdline_disabled);
+        trace_event_read_unlock();
 }
 
 static void print_lat_help_header(struct seq_file *m)
@@ -1774,6 +1821,7 @@ static int trace_empty(struct trace_iterator *iter)
         return 1;
 }
 
+/*  Called with trace_event_read_lock() held. */
 static enum print_line_t print_trace_line(struct trace_iterator *iter)
 {
         enum print_line_t ret;
@@ -2143,11 +2191,12 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf,
         if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL))
                 return -ENOMEM;
 
-        mutex_lock(&tracing_cpumask_update_lock);
         err = cpumask_parse_user(ubuf, count, tracing_cpumask_new);
         if (err)
                 goto err_unlock;
 
+        mutex_lock(&tracing_cpumask_update_lock);
+
         local_irq_disable();
         __raw_spin_lock(&ftrace_max_lock);
         for_each_tracing_cpu(cpu) {
@@ -2175,8 +2224,7 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf,
         return count;
 
 err_unlock:
-        mutex_unlock(&tracing_cpumask_update_lock);
-        free_cpumask_var(tracing_cpumask);
+        free_cpumask_var(tracing_cpumask_new);
 
         return err;
 }
@@ -2366,21 +2414,20 @@ static const struct file_operations tracing_iter_fops = {
 
 static const char readme_msg[] =
         "tracing mini-HOWTO:\n\n"
-        "# mkdir /debug\n"
-        "# mount -t debugfs nodev /debug\n\n"
-        "# cat /debug/tracing/available_tracers\n"
+        "# mount -t debugfs nodev /sys/kernel/debug\n\n"
+        "# cat /sys/kernel/debug/tracing/available_tracers\n"
         "wakeup preemptirqsoff preemptoff irqsoff function sched_switch nop\n\n"
-        "# cat /debug/tracing/current_tracer\n"
+        "# cat /sys/kernel/debug/tracing/current_tracer\n"
         "nop\n"
-        "# echo sched_switch > /debug/tracing/current_tracer\n"
-        "# cat /debug/tracing/current_tracer\n"
+        "# echo sched_switch > /sys/kernel/debug/tracing/current_tracer\n"
+        "# cat /sys/kernel/debug/tracing/current_tracer\n"
         "sched_switch\n"
-        "# cat /debug/tracing/trace_options\n"
+        "# cat /sys/kernel/debug/tracing/trace_options\n"
         "noprint-parent nosym-offset nosym-addr noverbose\n"
-        "# echo print-parent > /debug/tracing/trace_options\n"
-        "# echo 1 > /debug/tracing/tracing_enabled\n"
-        "# cat /debug/tracing/trace > /tmp/trace.txt\n"
-        "echo 0 > /debug/tracing/tracing_enabled\n"
+        "# echo print-parent > /sys/kernel/debug/tracing/trace_options\n"
+        "# echo 1 > /sys/kernel/debug/tracing/tracing_enabled\n"
+        "# cat /sys/kernel/debug/tracing/trace > /tmp/trace.txt\n"
+        "# echo 0 > /sys/kernel/debug/tracing/tracing_enabled\n"
 ;
 
 static ssize_t
@@ -2397,6 +2444,56 @@ static const struct file_operations tracing_readme_fops = {
 };
 
 static ssize_t
+tracing_saved_cmdlines_read(struct file *file, char __user *ubuf,
+                                size_t cnt, loff_t *ppos)
+{
+        char *buf_comm;
+        char *file_buf;
+        char *buf;
+        int len = 0;
+        int pid;
+        int i;
+
+        file_buf = kmalloc(SAVED_CMDLINES*(16+TASK_COMM_LEN), GFP_KERNEL);
+        if (!file_buf)
+                return -ENOMEM;
+
+        buf_comm = kmalloc(TASK_COMM_LEN, GFP_KERNEL);
+        if (!buf_comm) {
+                kfree(file_buf);
+                return -ENOMEM;
+        }
+
+        buf = file_buf;
+
+        for (i = 0; i < SAVED_CMDLINES; i++) {
+                int r;
+
+                pid = map_cmdline_to_pid[i];
+                if (pid == -1 || pid == NO_CMDLINE_MAP)
+                        continue;
+
+                trace_find_cmdline(pid, buf_comm);
+                r = sprintf(buf, "%d %s\n", pid, buf_comm);
+                buf += r;
+                len += r;
+        }
+
+        len = simple_read_from_buffer(ubuf, cnt, ppos,
+                                      file_buf, len);
+
+        kfree(file_buf);
+        kfree(buf_comm);
+
+        return len;
+}
+
+static const struct file_operations tracing_saved_cmdlines_fops = {
+    .open       = tracing_open_generic,
+    .read       = tracing_saved_cmdlines_read,
+};
+
+static ssize_t
 tracing_ctrl_read(struct file *filp, char __user *ubuf,
                   size_t cnt, loff_t *ppos)
 {
@@ -2728,6 +2825,9 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
         /* trace pipe does not show start of buffer */
         cpumask_setall(iter->started);
 
+        if (trace_flags & TRACE_ITER_LATENCY_FMT)
+                iter->iter_flags |= TRACE_FILE_LAT_FMT;
+
         iter->cpu_file = cpu_file;
         iter->tr = &global_trace;
         mutex_init(&iter->mutex);
@@ -2915,6 +3015,7 @@ waitagain:
                offsetof(struct trace_iterator, seq));
         iter->pos = -1;
 
+        trace_event_read_lock();
         while (find_next_entry_inc(iter) != NULL) {
                 enum print_line_t ret;
                 int len = iter->seq.len;
@@ -2931,6 +3032,7 @@ waitagain:
                 if (iter->seq.len >= cnt)
                         break;
         }
+        trace_event_read_unlock();
 
         /* Now copy what we have to the user */
         sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
@@ -3053,6 +3155,8 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
                 goto out_err;
         }
 
+        trace_event_read_lock();
+
         /* Fill as many pages as possible. */
         for (i = 0, rem = len; i < PIPE_BUFFERS && rem; i++) {
                 pages[i] = alloc_page(GFP_KERNEL);
@@ -3075,6 +3179,7 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
                 trace_seq_init(&iter->seq);
         }
 
+        trace_event_read_unlock();
         mutex_unlock(&iter->mutex);
 
         spd.nr_pages = i;
@@ -3425,7 +3530,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
                 .spd_release    = buffer_spd_release,
         };
         struct buffer_ref *ref;
-        int size, i;
+        int entries, size, i;
         size_t ret;
 
         if (*ppos & (PAGE_SIZE - 1)) {
@@ -3440,7 +3545,9 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
                 len &= PAGE_MASK;
         }
 
-        for (i = 0; i < PIPE_BUFFERS && len; i++, len -= PAGE_SIZE) {
+        entries = ring_buffer_entries_cpu(info->tr->buffer, info->cpu);
+
+        for (i = 0; i < PIPE_BUFFERS && len && entries; i++, len -= PAGE_SIZE) {
                 struct page *page;
                 int r;
 
@@ -3457,7 +3564,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
                 }
 
                 r = ring_buffer_read_page(ref->buffer, &ref->page,
-                                          len, info->cpu, 0);
+                                          len, info->cpu, 1);
                 if (r < 0) {
                         ring_buffer_free_read_page(ref->buffer,
                                                    ref->page);
@@ -3481,6 +3588,8 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
                 spd.partial[i].private = (unsigned long)ref;
                 spd.nr_pages++;
                 *ppos += PAGE_SIZE;
+
+                entries = ring_buffer_entries_cpu(info->tr->buffer, info->cpu);
         }
 
         spd.nr_pages = i;
@@ -3508,6 +3617,45 @@ static const struct file_operations tracing_buffers_fops = {
         .llseek         = no_llseek,
 };
 
+static ssize_t
+tracing_stats_read(struct file *filp, char __user *ubuf,
+                   size_t count, loff_t *ppos)
+{
+        unsigned long cpu = (unsigned long)filp->private_data;
+        struct trace_array *tr = &global_trace;
+        struct trace_seq *s;
+        unsigned long cnt;
+
+        s = kmalloc(sizeof(*s), GFP_KERNEL);
+        if (!s)
+                return ENOMEM;
+
+        trace_seq_init(s);
+
+        cnt = ring_buffer_entries_cpu(tr->buffer, cpu);
+        trace_seq_printf(s, "entries: %ld\n", cnt);
+
+        cnt = ring_buffer_overrun_cpu(tr->buffer, cpu);
+        trace_seq_printf(s, "overrun: %ld\n", cnt);
+
+        cnt = ring_buffer_commit_overrun_cpu(tr->buffer, cpu);
+        trace_seq_printf(s, "commit overrun: %ld\n", cnt);
+
+        cnt = ring_buffer_nmi_dropped_cpu(tr->buffer, cpu);
+        trace_seq_printf(s, "nmi dropped: %ld\n", cnt);
+
+        count = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len);
+
+        kfree(s);
+
+        return count;
+}
+
+static const struct file_operations tracing_stats_fops = {
+        .open           = tracing_open_generic,
+        .read           = tracing_stats_read,
+};
+
 #ifdef CONFIG_DYNAMIC_FTRACE
 
 int __weak ftrace_arch_read_dyn_info(char *buf, int size)
@@ -3597,7 +3745,7 @@ struct dentry *tracing_dentry_percpu(void)
 static void tracing_init_debugfs_percpu(long cpu)
 {
         struct dentry *d_percpu = tracing_dentry_percpu();
-        struct dentry *entry, *d_cpu;
+        struct dentry *d_cpu;
         /* strlen(cpu) + MAX(log10(cpu)) + '\0' */
         char cpu_dir[7];
 
@@ -3612,21 +3760,18 @@ static void tracing_init_debugfs_percpu(long cpu)
         }
 
         /* per cpu trace_pipe */
-        entry = debugfs_create_file("trace_pipe", 0444, d_cpu,
-                                (void *) cpu, &tracing_pipe_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'trace_pipe' entry\n");
+        trace_create_file("trace_pipe", 0444, d_cpu,
+                        (void *) cpu, &tracing_pipe_fops);
 
         /* per cpu trace */
-        entry = debugfs_create_file("trace", 0644, d_cpu,
-                                (void *) cpu, &tracing_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'trace' entry\n");
+        trace_create_file("trace", 0644, d_cpu,
+                        (void *) cpu, &tracing_fops);
 
-        entry = debugfs_create_file("trace_pipe_raw", 0444, d_cpu,
-                                    (void *) cpu, &tracing_buffers_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'trace_pipe_raw' entry\n");
+        trace_create_file("trace_pipe_raw", 0444, d_cpu,
+                        (void *) cpu, &tracing_buffers_fops);
+
+        trace_create_file("stats", 0444, d_cpu,
+                        (void *) cpu, &tracing_stats_fops);
 }
 
 #ifdef CONFIG_FTRACE_SELFTEST
@@ -3782,6 +3927,22 @@ static const struct file_operations trace_options_core_fops = {
         .write = trace_options_core_write,
 };
 
+struct dentry *trace_create_file(const char *name,
+                                 mode_t mode,
+                                 struct dentry *parent,
+                                 void *data,
+                                 const struct file_operations *fops)
+{
+        struct dentry *ret;
+
+        ret = debugfs_create_file(name, mode, parent, data, fops);
+        if (!ret)
+                pr_warning("Could not create debugfs '%s' entry\n", name);
+
+        return ret;
+}
+
+
 static struct dentry *trace_options_init_dentry(void)
 {
         struct dentry *d_tracer;
@@ -3809,7 +3970,6 @@ create_trace_option_file(struct trace_option_dentry *topt,
                          struct tracer_opt *opt)
 {
         struct dentry *t_options;
-        struct dentry *entry;
 
         t_options = trace_options_init_dentry();
         if (!t_options)
@@ -3818,11 +3978,9 @@ create_trace_option_file(struct trace_option_dentry *topt,
         topt->flags = flags;
         topt->opt = opt;
 
-        entry = debugfs_create_file(opt->name, 0644, t_options, topt,
+        topt->entry = trace_create_file(opt->name, 0644, t_options, topt,
                                     &trace_options_fops);
 
-        topt->entry = entry;
-
 }
 
 static struct trace_option_dentry *
@@ -3877,123 +4035,84 @@ static struct dentry *
 create_trace_option_core_file(const char *option, long index)
 {
         struct dentry *t_options;
-        struct dentry *entry;
 
         t_options = trace_options_init_dentry();
         if (!t_options)
                 return NULL;
 
-        entry = debugfs_create_file(option, 0644, t_options, (void *)index,
+        return trace_create_file(option, 0644, t_options, (void *)index,
                                     &trace_options_core_fops);
-
-        return entry;
 }
 
 static __init void create_trace_options_dir(void)
 {
         struct dentry *t_options;
-        struct dentry *entry;
         int i;
 
         t_options = trace_options_init_dentry();
         if (!t_options)
                 return;
 
-        for (i = 0; trace_options[i]; i++) {
-                entry = create_trace_option_core_file(trace_options[i], i);
-                if (!entry)
-                        pr_warning("Could not create debugfs %s entry\n",
-                                   trace_options[i]);
-        }
+        for (i = 0; trace_options[i]; i++)
+                create_trace_option_core_file(trace_options[i], i);
 }
 
 static __init int tracer_init_debugfs(void)
 {
         struct dentry *d_tracer;
-        struct dentry *entry;
         int cpu;
 
         d_tracer = tracing_init_dentry();
 
-        entry = debugfs_create_file("tracing_enabled", 0644, d_tracer,
-                                    &global_trace, &tracing_ctrl_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'tracing_enabled' entry\n");
+        trace_create_file("tracing_enabled", 0644, d_tracer,
+                        &global_trace, &tracing_ctrl_fops);
 
-        entry = debugfs_create_file("trace_options", 0644, d_tracer,
-                                    NULL, &tracing_iter_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'trace_options' entry\n");
+        trace_create_file("trace_options", 0644, d_tracer,
+                        NULL, &tracing_iter_fops);
 
-        create_trace_options_dir();
+        trace_create_file("tracing_cpumask", 0644, d_tracer,
+                        NULL, &tracing_cpumask_fops);
 
-        entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer,
-                                    NULL, &tracing_cpumask_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'tracing_cpumask' entry\n");
-
-        entry = debugfs_create_file("trace", 0644, d_tracer,
-                                 (void *) TRACE_PIPE_ALL_CPU, &tracing_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'trace' entry\n");
-
-        entry = debugfs_create_file("available_tracers", 0444, d_tracer,
-                                    &global_trace, &show_traces_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'available_tracers' entry\n");
-
-        entry = debugfs_create_file("current_tracer", 0444, d_tracer,
-                                    &global_trace, &set_tracer_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'current_tracer' entry\n");
-
-        entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer,
-                                    &tracing_max_latency,
-                                    &tracing_max_lat_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'tracing_max_latency' entry\n");
-
-        entry = debugfs_create_file("tracing_thresh", 0644, d_tracer,
-                                    &tracing_thresh, &tracing_max_lat_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'tracing_thresh' entry\n");
-        entry = debugfs_create_file("README", 0644, d_tracer,
-                                    NULL, &tracing_readme_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'README' entry\n");
-
-        entry = debugfs_create_file("trace_pipe", 0444, d_tracer,
+        trace_create_file("trace", 0644, d_tracer,
+                        (void *) TRACE_PIPE_ALL_CPU, &tracing_fops);
+
+        trace_create_file("available_tracers", 0444, d_tracer,
+                        &global_trace, &show_traces_fops);
+
+        trace_create_file("current_tracer", 0644, d_tracer,
+                        &global_trace, &set_tracer_fops);
+
+        trace_create_file("tracing_max_latency", 0644, d_tracer,
+                        &tracing_max_latency, &tracing_max_lat_fops);
+
+        trace_create_file("tracing_thresh", 0644, d_tracer,
+                        &tracing_thresh, &tracing_max_lat_fops);
+
+        trace_create_file("README", 0444, d_tracer,
+                        NULL, &tracing_readme_fops);
+
+        trace_create_file("trace_pipe", 0444, d_tracer,
                         (void *) TRACE_PIPE_ALL_CPU, &tracing_pipe_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'trace_pipe' entry\n");
-
-        entry = debugfs_create_file("buffer_size_kb", 0644, d_tracer,
-                                    &global_trace, &tracing_entries_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'buffer_size_kb' entry\n");
-
-        entry = debugfs_create_file("trace_marker", 0220, d_tracer,
-                                    NULL, &tracing_mark_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'trace_marker' entry\n");
+
+        trace_create_file("buffer_size_kb", 0644, d_tracer,
+                        &global_trace, &tracing_entries_fops);
+
+        trace_create_file("trace_marker", 0220, d_tracer,
+                        NULL, &tracing_mark_fops);
+
+        trace_create_file("saved_cmdlines", 0444, d_tracer,
+                        NULL, &tracing_saved_cmdlines_fops);
 
 #ifdef CONFIG_DYNAMIC_FTRACE
-        entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer,
-                                    &ftrace_update_tot_cnt,
-                                    &tracing_dyn_info_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'dyn_ftrace_total_info' entry\n");
+        trace_create_file("dyn_ftrace_total_info", 0444, d_tracer,
+                        &ftrace_update_tot_cnt, &tracing_dyn_info_fops);
 #endif
 #ifdef CONFIG_SYSPROF_TRACER
         init_tracer_sysprof_debugfs(d_tracer);
 #endif
 
+        create_trace_options_dir();
+
         for_each_tracing_cpu(cpu)
                 tracing_init_debugfs_percpu(cpu);
 
@@ -4064,7 +4183,8 @@ trace_printk_seq(struct trace_seq *s)
 
 static void __ftrace_dump(bool disable_tracing)
 {
-        static DEFINE_SPINLOCK(ftrace_dump_lock);
+        static raw_spinlock_t ftrace_dump_lock =
+                (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
         /* use static because iter can be a bit big for the stack */
         static struct trace_iterator iter;
         unsigned int old_userobj;
@@ -4073,7 +4193,8 @@ static void __ftrace_dump(bool disable_tracing)
         int cnt = 0, cpu;
 
         /* only one dump */
-        spin_lock_irqsave(&ftrace_dump_lock, flags);
+        local_irq_save(flags);
+        __raw_spin_lock(&ftrace_dump_lock);
         if (dump_ran)
                 goto out;
 
@@ -4145,7 +4266,8 @@ static void __ftrace_dump(bool disable_tracing)
         }
 
  out:
-        spin_unlock_irqrestore(&ftrace_dump_lock, flags);
+        __raw_spin_unlock(&ftrace_dump_lock);
+        local_irq_restore(flags);
 }
 
 /* By default: disable tracing after the dump */
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index e685ac2b2ba1..6e735d4771f8 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -9,9 +9,12 @@
 #include <linux/mmiotrace.h>
 #include <linux/ftrace.h>
 #include <trace/boot.h>
-#include <trace/kmemtrace.h>
+#include <linux/kmemtrace.h>
 #include <trace/power.h>
 
+#include <linux/trace_seq.h>
+#include <linux/ftrace_event.h>
+
 enum trace_type {
         __TRACE_FIRST_TYPE = 0,
 
@@ -42,20 +45,6 @@ enum trace_type {
 };
 
 /*
- * The trace entry - the most basic unit of tracing. This is what
- * is printed in the end as a single line in the trace output, such as:
- *
- *     bash-15816 [01]   235.197585: idle_cpu <- irq_enter
- */
-struct trace_entry {
-        unsigned char           type;
-        unsigned char           flags;
-        unsigned char           preempt_count;
-        int                     pid;
-        int                     tgid;
-};
-
-/*
  * Function trace entry - function address and parent function addres:
  */
 struct ftrace_entry {
@@ -263,8 +252,6 @@ struct trace_array_cpu {
         char                    comm[TASK_COMM_LEN];
 };
 
-struct trace_iterator;
-
 /*
  * The trace array - an array of per-CPU trace arrays. This is the
  * highest level data structure that individual tracers deal with.
@@ -339,15 +326,6 @@ extern void __ftrace_bad_type(void);
                 __ftrace_bad_type();                                    \
         } while (0)
 
-/* Return values for print_line callback */
-enum print_line_t {
-        TRACE_TYPE_PARTIAL_LINE = 0,    /* Retry after flushing the seq */
-        TRACE_TYPE_HANDLED      = 1,
-        TRACE_TYPE_UNHANDLED    = 2,    /* Relay to other output functions */
-        TRACE_TYPE_NO_CONSUME   = 3     /* Handled but ask to not consume */
-};
-
-
 /*
  * An option specific to a tracer. This is a boolean value.
  * The bit is the bit index that sets its value on the
@@ -423,60 +401,30 @@ struct tracer {
         struct tracer_stat      *stats;
 };
 
-struct trace_seq {
-        unsigned char           buffer[PAGE_SIZE];
-        unsigned int            len;
-        unsigned int            readpos;
-};
-
-static inline void
-trace_seq_init(struct trace_seq *s)
-{
-        s->len = 0;
-        s->readpos = 0;
-}
-
 
 #define TRACE_PIPE_ALL_CPU      -1
 
-/*
- * Trace iterator - used by printout routines who present trace
- * results to users and which routines might sleep, etc:
- */
-struct trace_iterator {
-        struct trace_array      *tr;
-        struct tracer           *trace;
-        void                    *private;
-        int                     cpu_file;
-        struct mutex            mutex;
-        struct ring_buffer_iter *buffer_iter[NR_CPUS];
-
-        /* The below is zeroed out in pipe_read */
-        struct trace_seq        seq;
-        struct trace_entry      *ent;
-        int                     cpu;
-        u64                     ts;
-
-        unsigned long           iter_flags;
-        loff_t                  pos;
-        long                    idx;
-
-        cpumask_var_t           started;
-};
-
 int tracer_init(struct tracer *t, struct trace_array *tr);
 int tracing_is_enabled(void);
 void trace_wake_up(void);
 void tracing_reset(struct trace_array *tr, int cpu);
 void tracing_reset_online_cpus(struct trace_array *tr);
+void tracing_reset_current(int cpu);
+void tracing_reset_current_online_cpus(void);
 int tracing_open_generic(struct inode *inode, struct file *filp);
+struct dentry *trace_create_file(const char *name,
+                                 mode_t mode,
+                                 struct dentry *parent,
+                                 void *data,
+                                 const struct file_operations *fops);
+
 struct dentry *tracing_init_dentry(void);
 void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
 
 struct ring_buffer_event;
 
 struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr,
-                                                    unsigned char type,
+                                                    int type,
                                                     unsigned long len,
                                                     unsigned long flags,
                                                     int pc);
@@ -484,14 +432,6 @@ void trace_buffer_unlock_commit(struct trace_array *tr,
                                 struct ring_buffer_event *event,
                                 unsigned long flags, int pc);
 
-struct ring_buffer_event *
-trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,
-                                  unsigned long flags, int pc);
-void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
-                                        unsigned long flags, int pc);
-void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,
-                                        unsigned long flags, int pc);
-
 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
                                                 struct trace_array_cpu *data);
 
@@ -514,7 +454,6 @@ void tracing_sched_switch_trace(struct trace_array *tr,
                                 struct task_struct *prev,
                                 struct task_struct *next,
                                 unsigned long flags, int pc);
-void tracing_record_cmdline(struct task_struct *tsk);
 
 void tracing_sched_wakeup_trace(struct trace_array *tr,
                                 struct task_struct *wakee,
@@ -599,6 +538,8 @@ extern int trace_selftest_startup_sysprof(struct tracer *trace,
                                                struct trace_array *tr);
 extern int trace_selftest_startup_branch(struct tracer *trace,
                                          struct trace_array *tr);
+extern int trace_selftest_startup_hw_branches(struct tracer *trace,
+                                              struct trace_array *tr);
 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 
 extern void *head_page(struct trace_array_cpu *data);
@@ -613,6 +554,8 @@ extern unsigned long trace_flags;
 /* Standard output formatting function used for function return traces */
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 extern enum print_line_t print_graph_function(struct trace_iterator *iter);
+extern enum print_line_t
+trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
 
 #ifdef CONFIG_DYNAMIC_FTRACE
 /* TODO: make this variable */
@@ -644,7 +587,6 @@ static inline int ftrace_graph_addr(unsigned long addr)
         return 1;
 }
 #endif /* CONFIG_DYNAMIC_FTRACE */
-
 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
 static inline enum print_line_t
 print_graph_function(struct trace_iterator *iter)
@@ -692,6 +634,7 @@ enum trace_iterator_flags {
         TRACE_ITER_LATENCY_FMT          = 0x40000,
         TRACE_ITER_GLOBAL_CLK           = 0x80000,
         TRACE_ITER_SLEEP_TIME           = 0x100000,
+        TRACE_ITER_GRAPH_TIME           = 0x200000,
 };
 
 /*
@@ -790,103 +733,113 @@ struct ftrace_event_field {
         char                    *type;
         int                     offset;
         int                     size;
+        int                     is_signed;
 };
 
-struct ftrace_event_call {
-        char                    *name;
-        char                    *system;
-        struct dentry           *dir;
-        int                     enabled;
-        int                     (*regfunc)(void);
-        void                    (*unregfunc)(void);
-        int                     id;
-        int                     (*raw_init)(void);
-        int                     (*show_format)(struct trace_seq *s);
-        int                     (*define_fields)(void);
-        struct list_head        fields;
+struct event_filter {
+        int                     n_preds;
         struct filter_pred      **preds;
-
-#ifdef CONFIG_EVENT_PROFILE
-        atomic_t        profile_count;
-        int             (*profile_enable)(struct ftrace_event_call *);
-        void            (*profile_disable)(struct ftrace_event_call *);
-#endif
+        char                    *filter_string;
 };
 
 struct event_subsystem {
         struct list_head        list;
         const char              *name;
         struct dentry           *entry;
-        struct filter_pred      **preds;
+        void                    *filter;
 };
 
-#define events_for_each(event)                                          \
-        for (event = __start_ftrace_events;                             \
-             (unsigned long)event < (unsigned long)__stop_ftrace_events; \
-             event++)
-
-#define MAX_FILTER_PRED 8
-
 struct filter_pred;
 
-typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
+typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
+                                 int val1, int val2);
 
 struct filter_pred {
         filter_pred_fn_t fn;
         u64 val;
-        char *str_val;
+        char str_val[MAX_FILTER_STR_VAL];
         int str_len;
         char *field_name;
         int offset;
         int not;
-        int or;
-        int compound;
-        int clear;
+        int op;
+        int pop_n;
 };
 
-int trace_define_field(struct ftrace_event_call *call, char *type,
-                       char *name, int offset, int size);
-extern void filter_free_pred(struct filter_pred *pred);
-extern void filter_print_preds(struct filter_pred **preds,
+extern void print_event_filter(struct ftrace_event_call *call,
                                struct trace_seq *s);
-extern int filter_parse(char **pbuf, struct filter_pred *pred);
-extern int filter_add_pred(struct ftrace_event_call *call,
-                           struct filter_pred *pred);
-extern void filter_free_preds(struct ftrace_event_call *call);
-extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
-extern void filter_free_subsystem_preds(struct event_subsystem *system);
-extern int filter_add_subsystem_pred(struct event_subsystem *system,
-                                     struct filter_pred *pred);
-
-void event_trace_printk(unsigned long ip, const char *fmt, ...);
-extern struct ftrace_event_call __start_ftrace_events[];
-extern struct ftrace_event_call __stop_ftrace_events[];
-
-#define for_each_event(event)                                           \
-        for (event = __start_ftrace_events;                             \
-             (unsigned long)event < (unsigned long)__stop_ftrace_events; \
-             event++)
+extern int apply_event_filter(struct ftrace_event_call *call,
+                              char *filter_string);
+extern int apply_subsystem_event_filter(struct event_subsystem *system,
+                                        char *filter_string);
+extern void print_subsystem_event_filter(struct event_subsystem *system,
+                                         struct trace_seq *s);
+
+static inline int
+filter_check_discard(struct ftrace_event_call *call, void *rec,
+                     struct ring_buffer *buffer,
+                     struct ring_buffer_event *event)
+{
+        if (unlikely(call->filter_active) && !filter_match_preds(call, rec)) {
+                ring_buffer_discard_commit(buffer, event);
+                return 1;
+        }
+
+        return 0;
+}
+
+#define DEFINE_COMPARISON_PRED(type)                                    \
+static int filter_pred_##type(struct filter_pred *pred, void *event,    \
+                              int val1, int val2)                       \
+{                                                                       \
+        type *addr = (type *)(event + pred->offset);                    \
+        type val = (type)pred->val;                                     \
+        int match = 0;                                                  \
+                                                                        \
+        switch (pred->op) {                                             \
+        case OP_LT:                                                     \
+                match = (*addr < val);                                  \
+                break;                                                  \
+        case OP_LE:                                                     \
+                match = (*addr <= val);                                 \
+                break;                                                  \
+        case OP_GT:                                                     \
+                match = (*addr > val);                                  \
+                break;                                                  \
+        case OP_GE:                                                     \
+                match = (*addr >= val);                                 \
+                break;                                                  \
+        default:                                                        \
+                break;                                                  \
+        }                                                               \
+                                                                        \
+        return match;                                                   \
+}
+
+#define DEFINE_EQUALITY_PRED(size)                                      \
+static int filter_pred_##size(struct filter_pred *pred, void *event,    \
+                              int val1, int val2)                       \
+{                                                                       \
+        u##size *addr = (u##size *)(event + pred->offset);              \
+        u##size val = (u##size)pred->val;                               \
+        int match;                                                      \
+                                                                        \
+        match = (val == *addr) ^ pred->not;                             \
+                                                                        \
+        return match;                                                   \
+}
+
+extern struct mutex event_mutex;
+extern struct list_head ftrace_events;
 
 extern const char *__start___trace_bprintk_fmt[];
 extern const char *__stop___trace_bprintk_fmt[];
 
-/*
- * The double __builtin_constant_p is because gcc will give us an error
- * if we try to allocate the static variable to fmt if it is not a
- * constant. Even with the outer if statement optimizing out.
- */
-#define event_trace_printk(ip, fmt, args...)                            \
-do {                                                                    \
-        __trace_printk_check_format(fmt, ##args);                       \
-        tracing_record_cmdline(current);                                \
-        if (__builtin_constant_p(fmt)) {                                \
-                static const char *trace_printk_fmt                     \
-                  __attribute__((section("__trace_printk_fmt"))) =      \
-                        __builtin_constant_p(fmt) ? fmt : NULL;         \
-                                                                        \
-                __trace_bprintk(ip, trace_printk_fmt, ##args);          \
-        } else                                                          \
-                __trace_printk(ip, fmt, ##args);                        \
-} while (0)
+#undef TRACE_EVENT_FORMAT
+#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
+        extern struct ftrace_event_call event_##call;
+#undef TRACE_EVENT_FORMAT_NOFILTER
+#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, tpfmt)
+#include "trace_event_types.h"
 
 #endif /* _LINUX_KERNEL_TRACE_H */
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index 7a30fc4c3642..a29ef23ffb47 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -9,6 +9,7 @@
 #include <linux/debugfs.h>
 #include <linux/ftrace.h>
 #include <linux/kallsyms.h>
+#include <linux/time.h>
 
 #include "trace.h"
 #include "trace_output.h"
@@ -67,7 +68,7 @@ initcall_call_print_line(struct trace_iterator *iter)
         trace_assign_type(field, entry);
         call = &field->boot_call;
         ts = iter->ts;
-        nsec_rem = do_div(ts, 1000000000);
+        nsec_rem = do_div(ts, NSEC_PER_SEC);
 
         ret = trace_seq_printf(s, "[%5ld.%09ld] calling  %s @ %i\n",
                         (unsigned long)ts, nsec_rem, call->func, call->caller);
@@ -92,7 +93,7 @@ initcall_ret_print_line(struct trace_iterator *iter)
         trace_assign_type(field, entry);
         init_ret = &field->boot_ret;
         ts = iter->ts;
-        nsec_rem = do_div(ts, 1000000000);
+        nsec_rem = do_div(ts, NSEC_PER_SEC);
 
         ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s "
                         "returned %d after %llu msecs\n",
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
index 8333715e4066..7a7a9fd249a9 100644
--- a/kernel/trace/trace_branch.c
+++ b/kernel/trace/trace_branch.c
@@ -30,6 +30,7 @@ static struct trace_array *branch_tracer;
 static void
 probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
 {
+        struct ftrace_event_call *call = &event_branch;
         struct trace_array *tr = branch_tracer;
         struct ring_buffer_event *event;
         struct trace_branch *entry;
@@ -73,7 +74,8 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
         entry->line = f->line;
         entry->correct = val == expect;
 
-        ring_buffer_unlock_commit(tr->buffer, event);
+        if (!filter_check_discard(call, entry, tr->buffer, event))
+                ring_buffer_unlock_commit(tr->buffer, event);
 
  out:
         atomic_dec(&tr->data[cpu]->disabled);
@@ -271,7 +273,7 @@ static int branch_stat_show(struct seq_file *m, void *v)
         return 0;
 }
 
-static void *annotated_branch_stat_start(void)
+static void *annotated_branch_stat_start(struct tracer_stat *trace)
 {
         return __start_annotated_branch_profile;
 }
@@ -346,7 +348,7 @@ static int all_branch_stat_headers(struct seq_file *m)
         return 0;
 }
 
-static void *all_branch_stat_start(void)
+static void *all_branch_stat_start(struct tracer_stat *trace)
 {
         return __start_branch_profile;
 }
diff --git a/kernel/trace/trace_event_profile.c b/kernel/trace/trace_event_profile.c
index 22cba9970776..5b5895afecfe 100644
--- a/kernel/trace/trace_event_profile.c
+++ b/kernel/trace/trace_event_profile.c
@@ -10,22 +10,30 @@
 int ftrace_profile_enable(int event_id)
 {
         struct ftrace_event_call *event;
+        int ret = -EINVAL;
 
-        for_each_event(event) {
-                if (event->id == event_id)
-                        return event->profile_enable(event);
+        mutex_lock(&event_mutex);
+        list_for_each_entry(event, &ftrace_events, list) {
+                if (event->id == event_id) {
+                        ret = event->profile_enable(event);
+                        break;
+                }
         }
+        mutex_unlock(&event_mutex);
 
-        return -EINVAL;
+        return ret;
 }
 
 void ftrace_profile_disable(int event_id)
 {
         struct ftrace_event_call *event;
 
-        for_each_event(event) {
-                if (event->id == event_id)
-                        return event->profile_disable(event);
+        mutex_lock(&event_mutex);
+        list_for_each_entry(event, &ftrace_events, list) {
+                if (event->id == event_id) {
+                        event->profile_disable(event);
+                        break;
+                }
         }
+        mutex_unlock(&event_mutex);
 }
-
diff --git a/kernel/trace/trace_event_types.h b/kernel/trace/trace_event_types.h
index fd78bee71dd7..5e32e375134d 100644
--- a/kernel/trace/trace_event_types.h
+++ b/kernel/trace/trace_event_types.h
@@ -57,7 +57,7 @@ TRACE_EVENT_FORMAT(context_switch, TRACE_CTX, ctx_switch_entry, ignore,
         TP_RAW_FMT("%u:%u:%u  ==+ %u:%u:%u [%03u]")
 );
 
-TRACE_EVENT_FORMAT(special, TRACE_SPECIAL, special_entry, ignore,
+TRACE_EVENT_FORMAT_NOFILTER(special, TRACE_SPECIAL, special_entry, ignore,
         TRACE_STRUCT(
                 TRACE_FIELD(unsigned long, arg1, arg1)
                 TRACE_FIELD(unsigned long, arg2, arg2)
@@ -122,8 +122,10 @@ TRACE_EVENT_FORMAT(print, TRACE_PRINT, print_entry, ignore,
 TRACE_EVENT_FORMAT(branch, TRACE_BRANCH, trace_branch, ignore,
         TRACE_STRUCT(
                 TRACE_FIELD(unsigned int, line, line)
-                TRACE_FIELD_SPECIAL(char func[TRACE_FUNC_SIZE+1], func, func)
-                TRACE_FIELD_SPECIAL(char file[TRACE_FUNC_SIZE+1], file, file)
+                TRACE_FIELD_SPECIAL(char func[TRACE_FUNC_SIZE+1], func,
+                                    TRACE_FUNC_SIZE+1, func)
+                TRACE_FIELD_SPECIAL(char file[TRACE_FUNC_SIZE+1], file,
+                                    TRACE_FUNC_SIZE+1, file)
                 TRACE_FIELD(char, correct, correct)
         ),
         TP_RAW_FMT("%u:%s:%s (%u)")
@@ -139,8 +141,8 @@ TRACE_EVENT_FORMAT(hw_branch, TRACE_HW_BRANCHES, hw_branch_entry, ignore,
 
 TRACE_EVENT_FORMAT(power, TRACE_POWER, trace_power, ignore,
         TRACE_STRUCT(
-                TRACE_FIELD(ktime_t, state_data.stamp, stamp)
-                TRACE_FIELD(ktime_t, state_data.end, end)
+                TRACE_FIELD_SIGN(ktime_t, state_data.stamp, stamp, 1)
+                TRACE_FIELD_SIGN(ktime_t, state_data.end, end, 1)
                 TRACE_FIELD(int, state_data.type, type)
                 TRACE_FIELD(int, state_data.state, state)
         ),
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 576f4fa2af0d..aa08be69a1b6 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -8,19 +8,25 @@
  *
  */
 
+#include <linux/workqueue.h>
+#include <linux/spinlock.h>
+#include <linux/kthread.h>
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/module.h>
 #include <linux/ctype.h>
+#include <linux/delay.h>
 
 #include "trace_output.h"
 
 #define TRACE_SYSTEM "TRACE_SYSTEM"
 
-static DEFINE_MUTEX(event_mutex);
+DEFINE_MUTEX(event_mutex);
+
+LIST_HEAD(ftrace_events);
 
 int trace_define_field(struct ftrace_event_call *call, char *type,
-                       char *name, int offset, int size)
+                       char *name, int offset, int size, int is_signed)
 {
         struct ftrace_event_field *field;
 
@@ -38,6 +44,7 @@ int trace_define_field(struct ftrace_event_call *call, char *type,
 
         field->offset = offset;
         field->size = size;
+        field->is_signed = is_signed;
         list_add(&field->link, &call->fields);
 
         return 0;
@@ -51,47 +58,94 @@ err:
 
         return -ENOMEM;
 }
+EXPORT_SYMBOL_GPL(trace_define_field);
 
-static void ftrace_clear_events(void)
-{
-        struct ftrace_event_call *call = (void *)__start_ftrace_events;
-
+#ifdef CONFIG_MODULES
 
-        while ((unsigned long)call < (unsigned long)__stop_ftrace_events) {
+static void trace_destroy_fields(struct ftrace_event_call *call)
+{
+        struct ftrace_event_field *field, *next;
 
-                if (call->enabled) {
-                        call->enabled = 0;
-                        call->unregfunc();
-                }
-                call++;
+        list_for_each_entry_safe(field, next, &call->fields, link) {
+                list_del(&field->link);
+                kfree(field->type);
+                kfree(field->name);
+                kfree(field);
         }
 }
 
+#endif /* CONFIG_MODULES */
+
 static void ftrace_event_enable_disable(struct ftrace_event_call *call,
                                         int enable)
 {
-
         switch (enable) {
         case 0:
                 if (call->enabled) {
                         call->enabled = 0;
+                        tracing_stop_cmdline_record();
                         call->unregfunc();
                 }
                 break;
         case 1:
                 if (!call->enabled) {
                         call->enabled = 1;
+                        tracing_start_cmdline_record();
                         call->regfunc();
                 }
                 break;
         }
 }
 
+static void ftrace_clear_events(void)
+{
+        struct ftrace_event_call *call;
+
+        mutex_lock(&event_mutex);
+        list_for_each_entry(call, &ftrace_events, list) {
+                ftrace_event_enable_disable(call, 0);
+        }
+        mutex_unlock(&event_mutex);
+}
+
+/*
+ * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events.
+ */
+static int __ftrace_set_clr_event(const char *match, const char *sub,
+                                  const char *event, int set)
+{
+        struct ftrace_event_call *call;
+        int ret = -EINVAL;
+
+        mutex_lock(&event_mutex);
+        list_for_each_entry(call, &ftrace_events, list) {
+
+                if (!call->name || !call->regfunc)
+                        continue;
+
+                if (match &&
+                    strcmp(match, call->name) != 0 &&
+                    strcmp(match, call->system) != 0)
+                        continue;
+
+                if (sub && strcmp(sub, call->system) != 0)
+                        continue;
+
+                if (event && strcmp(event, call->name) != 0)
+                        continue;
+
+                ftrace_event_enable_disable(call, set);
+
+                ret = 0;
+        }
+        mutex_unlock(&event_mutex);
+
+        return ret;
+}
+
 static int ftrace_set_clr_event(char *buf, int set)
 {
-        struct ftrace_event_call *call = __start_ftrace_events;
         char *event = NULL, *sub = NULL, *match;
-        int ret = -EINVAL;
 
         /*
          * The buf format can be <subsystem>:<event-name>
@@ -117,30 +171,24 @@ static int ftrace_set_clr_event(char *buf, int set)
                         event = NULL;
         }
 
-        mutex_lock(&event_mutex);
-        for_each_event(call) {
-
-                if (!call->name || !call->regfunc)
-                        continue;
-
-                if (match &&
-                    strcmp(match, call->name) != 0 &&
-                    strcmp(match, call->system) != 0)
-                        continue;
-
-                if (sub && strcmp(sub, call->system) != 0)
-                        continue;
-
-                if (event && strcmp(event, call->name) != 0)
-                        continue;
-
-                ftrace_event_enable_disable(call, set);
-
-                ret = 0;
-        }
-        mutex_unlock(&event_mutex);
+        return __ftrace_set_clr_event(match, sub, event, set);
+}
 
-        return ret;
+/**
+ * trace_set_clr_event - enable or disable an event
+ * @system: system name to match (NULL for any system)
+ * @event: event name to match (NULL for all events, within system)
+ * @set: 1 to enable, 0 to disable
+ *
+ * This is a way for other parts of the kernel to enable or disable
+ * event recording.
+ *
+ * Returns 0 on success, -EINVAL if the parameters do not match any
+ * registered events.
+ */
+int trace_set_clr_event(const char *system, const char *event, int set)
+{
+        return __ftrace_set_clr_event(NULL, system, event, set);
 }
 
 /* 128 should be much more than enough */
@@ -224,15 +272,17 @@ ftrace_event_write(struct file *file, const char __user *ubuf,
 static void *
 t_next(struct seq_file *m, void *v, loff_t *pos)
 {
-        struct ftrace_event_call *call = m->private;
-        struct ftrace_event_call *next = call;
+        struct list_head *list = m->private;
+        struct ftrace_event_call *call;
 
         (*pos)++;
 
         for (;;) {
-                if ((unsigned long)call >= (unsigned long)__stop_ftrace_events)
+                if (list == &ftrace_events)
                         return NULL;
 
+                call = list_entry(list, struct ftrace_event_call, list);
+
                 /*
                  * The ftrace subsystem is for showing formats only.
                  * They can not be enabled or disabled via the event files.
@@ -240,45 +290,51 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
                 if (call->regfunc)
                         break;
 
-                call++;
-                next = call;
+                list = list->next;
         }
 
-        m->private = ++next;
+        m->private = list->next;
 
         return call;
 }
 
 static void *t_start(struct seq_file *m, loff_t *pos)
 {
+        mutex_lock(&event_mutex);
+        if (*pos == 0)
+                m->private = ftrace_events.next;
         return t_next(m, NULL, pos);
 }
 
 static void *
 s_next(struct seq_file *m, void *v, loff_t *pos)
 {
-        struct ftrace_event_call *call = m->private;
-        struct ftrace_event_call *next;
+        struct list_head *list = m->private;
+        struct ftrace_event_call *call;
 
         (*pos)++;
 
  retry:
-        if ((unsigned long)call >= (unsigned long)__stop_ftrace_events)
+        if (list == &ftrace_events)
                 return NULL;
 
+        call = list_entry(list, struct ftrace_event_call, list);
+
         if (!call->enabled) {
-                call++;
+                list = list->next;
                 goto retry;
         }
 
-        next = call;
-        m->private = ++next;
+        m->private = list->next;
 
         return call;
 }
 
 static void *s_start(struct seq_file *m, loff_t *pos)
 {
+        mutex_lock(&event_mutex);
+        if (*pos == 0)
+                m->private = ftrace_events.next;
         return s_next(m, NULL, pos);
 }
 
@@ -295,12 +351,12 @@ static int t_show(struct seq_file *m, void *v)
 
 static void t_stop(struct seq_file *m, void *p)
 {
+        mutex_unlock(&event_mutex);
 }
 
 static int
 ftrace_event_seq_open(struct inode *inode, struct file *file)
 {
-        int ret;
         const struct seq_operations *seq_ops;
 
         if ((file->f_mode & FMODE_WRITE) &&
@@ -308,13 +364,7 @@ ftrace_event_seq_open(struct inode *inode, struct file *file)
                 ftrace_clear_events();
 
         seq_ops = inode->i_private;
-        ret = seq_open(file, seq_ops);
-        if (!ret) {
-                struct seq_file *m = file->private_data;
-
-                m->private = __start_ftrace_events;
-        }
-        return ret;
+        return seq_open(file, seq_ops);
 }
 
 static ssize_t
@@ -374,8 +424,93 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
         return cnt;
 }
 
+static ssize_t
+system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
+                   loff_t *ppos)
+{
+        const char set_to_char[4] = { '?', '0', '1', 'X' };
+        const char *system = filp->private_data;
+        struct ftrace_event_call *call;
+        char buf[2];
+        int set = 0;
+        int ret;
+
+        mutex_lock(&event_mutex);
+        list_for_each_entry(call, &ftrace_events, list) {
+                if (!call->name || !call->regfunc)
+                        continue;
+
+                if (system && strcmp(call->system, system) != 0)
+                        continue;
+
+                /*
+                 * We need to find out if all the events are set
+                 * or if all events or cleared, or if we have
+                 * a mixture.
+                 */
+                set |= (1 << !!call->enabled);
+
+                /*
+                 * If we have a mixture, no need to look further.
+                 */
+                if (set == 3)
+                        break;
+        }
+        mutex_unlock(&event_mutex);
+
+        buf[0] = set_to_char[set];
+        buf[1] = '\n';
+
+        ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
+
+        return ret;
+}
+
+static ssize_t
+system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
+                    loff_t *ppos)
+{
+        const char *system = filp->private_data;
+        unsigned long val;
+        char buf[64];
+        ssize_t ret;
+
+        if (cnt >= sizeof(buf))
+                return -EINVAL;
+
+        if (copy_from_user(&buf, ubuf, cnt))
+                return -EFAULT;
+
+        buf[cnt] = 0;
+
+        ret = strict_strtoul(buf, 10, &val);
+        if (ret < 0)
+                return ret;
+
+        ret = tracing_update_buffers();
+        if (ret < 0)
+                return ret;
+
+        if (val != 0 && val != 1)
+                return -EINVAL;
+
+        ret = __ftrace_set_clr_event(NULL, system, NULL, val);
+        if (ret)
+                goto out;
+
+        ret = cnt;
+
+out:
+        *ppos += cnt;
+
+        return ret;
+}
+
+extern char *__bad_type_size(void);
+
 #undef FIELD
 #define FIELD(type, name)                                               \
+        sizeof(type) != sizeof(field.name) ? __bad_type_size() :        \
         #type, "common_" #name, offsetof(typeof(field), name),          \
                 sizeof(field.name)
 
@@ -391,7 +526,7 @@ static int trace_write_header(struct trace_seq *s)
                                 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
                                 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
                                 "\n",
-                                FIELD(unsigned char, type),
+                                FIELD(unsigned short, type),
                                 FIELD(unsigned char, flags),
                                 FIELD(unsigned char, preempt_count),
                                 FIELD(int, pid),
@@ -481,7 +616,7 @@ event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
 
         trace_seq_init(s);
 
-        filter_print_preds(call->preds, s);
+        print_event_filter(call, s);
         r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
 
         kfree(s);
@@ -494,38 +629,26 @@ event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
                    loff_t *ppos)
 {
         struct ftrace_event_call *call = filp->private_data;
-        char buf[64], *pbuf = buf;
-        struct filter_pred *pred;
+        char *buf;
         int err;
 
-        if (cnt >= sizeof(buf))
+        if (cnt >= PAGE_SIZE)
                 return -EINVAL;
 
-        if (copy_from_user(&buf, ubuf, cnt))
-                return -EFAULT;
-        buf[cnt] = '\0';
-
-        pred = kzalloc(sizeof(*pred), GFP_KERNEL);
-        if (!pred)
+        buf = (char *)__get_free_page(GFP_TEMPORARY);
+        if (!buf)
                 return -ENOMEM;
 
-        err = filter_parse(&pbuf, pred);
-        if (err < 0) {
-                filter_free_pred(pred);
-                return err;
-        }
-
-        if (pred->clear) {
-                filter_free_preds(call);
-                filter_free_pred(pred);
-                return cnt;
+        if (copy_from_user(buf, ubuf, cnt)) {
+                free_page((unsigned long) buf);
+                return -EFAULT;
         }
+        buf[cnt] = '\0';
 
-        err = filter_add_pred(call, pred);
-        if (err < 0) {
-                filter_free_pred(pred);
+        err = apply_event_filter(call, buf);
+        free_page((unsigned long) buf);
+        if (err < 0)
                 return err;
-        }
 
         *ppos += cnt;
 
@@ -549,7 +672,7 @@ subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
 
         trace_seq_init(s);
 
-        filter_print_preds(system->preds, s);
+        print_subsystem_event_filter(system, s);
         r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
 
         kfree(s);
@@ -562,45 +685,56 @@ subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
                        loff_t *ppos)
 {
         struct event_subsystem *system = filp->private_data;
-        char buf[64], *pbuf = buf;
-        struct filter_pred *pred;
+        char *buf;
         int err;
 
-        if (cnt >= sizeof(buf))
+        if (cnt >= PAGE_SIZE)
                 return -EINVAL;
 
-        if (copy_from_user(&buf, ubuf, cnt))
-                return -EFAULT;
-        buf[cnt] = '\0';
-
-        pred = kzalloc(sizeof(*pred), GFP_KERNEL);
-        if (!pred)
+        buf = (char *)__get_free_page(GFP_TEMPORARY);
+        if (!buf)
                 return -ENOMEM;
 
-        err = filter_parse(&pbuf, pred);
-        if (err < 0) {
-                filter_free_pred(pred);
-                return err;
-        }
-
-        if (pred->clear) {
-                filter_free_subsystem_preds(system);
-                filter_free_pred(pred);
-                return cnt;
+        if (copy_from_user(buf, ubuf, cnt)) {
+                free_page((unsigned long) buf);
+                return -EFAULT;
         }
+        buf[cnt] = '\0';
 
-        err = filter_add_subsystem_pred(system, pred);
-        if (err < 0) {
-                filter_free_subsystem_preds(system);
-                filter_free_pred(pred);
+        err = apply_subsystem_event_filter(system, buf);
+        free_page((unsigned long) buf);
+        if (err < 0)
                 return err;
-        }
 
         *ppos += cnt;
 
         return cnt;
 }
 
+static ssize_t
+show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
+{
+        int (*func)(struct trace_seq *s) = filp->private_data;
+        struct trace_seq *s;
+        int r;
+
+        if (*ppos)
+                return 0;
+
+        s = kmalloc(sizeof(*s), GFP_KERNEL);
+        if (!s)
+                return -ENOMEM;
+
+        trace_seq_init(s);
+
+        func(s);
+        r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
+
+        kfree(s);
+
+        return r;
+}
+
 static const struct seq_operations show_event_seq_ops = {
         .start = t_start,
         .next = t_next,
@@ -658,6 +792,17 @@ static const struct file_operations ftrace_subsystem_filter_fops = {
         .write = subsystem_filter_write,
 };
 
+static const struct file_operations ftrace_system_enable_fops = {
+        .open = tracing_open_generic,
+        .read = system_enable_read,
+        .write = system_enable_write,
+};
+
+static const struct file_operations ftrace_show_header_fops = {
+        .open = tracing_open_generic,
+        .read = show_header,
+};
+
 static struct dentry *event_trace_events_dir(void)
 {
         static struct dentry *d_tracer;
@@ -684,6 +829,7 @@ static struct dentry *
 event_subsystem_dir(const char *name, struct dentry *d_events)
 {
         struct event_subsystem *system;
+        struct dentry *entry;
 
         /* First see if we did not already create this dir */
         list_for_each_entry(system, &event_subsystems, list) {
@@ -707,16 +853,46 @@ event_subsystem_dir(const char *name, struct dentry *d_events)
                 return d_events;
         }
 
-        system->name = name;
+        system->name = kstrdup(name, GFP_KERNEL);
+        if (!system->name) {
+                debugfs_remove(system->entry);
+                kfree(system);
+                return d_events;
+        }
+
         list_add(&system->list, &event_subsystems);
 
-        system->preds = NULL;
+        system->filter = NULL;
+
+        system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL);
+        if (!system->filter) {
+                pr_warning("Could not allocate filter for subsystem "
+                           "'%s'\n", name);
+                return system->entry;
+        }
+
+        entry = debugfs_create_file("filter", 0644, system->entry, system,
+                                    &ftrace_subsystem_filter_fops);
+        if (!entry) {
+                kfree(system->filter);
+                system->filter = NULL;
+                pr_warning("Could not create debugfs "
+                           "'%s/filter' entry\n", name);
+        }
+
+        entry = trace_create_file("enable", 0644, system->entry,
+                                  (void *)system->name,
+                                  &ftrace_system_enable_fops);
 
         return system->entry;
 }
 
 static int
-event_create_dir(struct ftrace_event_call *call, struct dentry *d_events)
+event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
+                 const struct file_operations *id,
+                 const struct file_operations *enable,
+                 const struct file_operations *filter,
+                 const struct file_operations *format)
 {
         struct dentry *entry;
         int ret;
@@ -725,7 +901,7 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events)
          * If the trace point header did not define TRACE_SYSTEM
          * then the system would be called "TRACE_SYSTEM".
          */
-        if (strcmp(call->system, "TRACE_SYSTEM") != 0)
+        if (strcmp(call->system, TRACE_SYSTEM) != 0)
                 d_events = event_subsystem_dir(call->system, d_events);
 
         if (call->raw_init) {
@@ -744,21 +920,13 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events)
                 return -1;
         }
 
-        if (call->regfunc) {
-                entry = debugfs_create_file("enable", 0644, call->dir, call,
-                                            &ftrace_enable_fops);
-                if (!entry)
-                        pr_warning("Could not create debugfs "
-                                   "'%s/enable' entry\n", call->name);
-        }
+        if (call->regfunc)
+                entry = trace_create_file("enable", 0644, call->dir, call,
+                                          enable);
 
-        if (call->id) {
-                entry = debugfs_create_file("id", 0444, call->dir, call,
-                                &ftrace_event_id_fops);
-                if (!entry)
-                        pr_warning("Could not create debugfs '%s/id' entry\n",
-                                        call->name);
-        }
+        if (call->id)
+                entry = trace_create_file("id", 0444, call->dir, call,
+                                          id);
 
         if (call->define_fields) {
                 ret = call->define_fields();
@@ -767,32 +935,195 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events)
                                    " events/%s\n", call->name);
                         return ret;
                 }
-                entry = debugfs_create_file("filter", 0644, call->dir, call,
-                                            &ftrace_event_filter_fops);
-                if (!entry)
-                        pr_warning("Could not create debugfs "
-                                   "'%s/filter' entry\n", call->name);
+                entry = trace_create_file("filter", 0644, call->dir, call,
+                                          filter);
         }
 
         /* A trace may not want to export its format */
         if (!call->show_format)
                 return 0;
 
-        entry = debugfs_create_file("format", 0444, call->dir, call,
-                                    &ftrace_event_format_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'%s/format' entry\n", call->name);
+        entry = trace_create_file("format", 0444, call->dir, call,
+                                  format);
+
+        return 0;
+}
+
+#define for_each_event(event, start, end)                       \
+        for (event = start;                                     \
+             (unsigned long)event < (unsigned long)end;         \
+             event++)
+
+#ifdef CONFIG_MODULES
+
+static LIST_HEAD(ftrace_module_file_list);
+
+/*
+ * Modules must own their file_operations to keep up with
+ * reference counting.
+ */
+struct ftrace_module_file_ops {
+        struct list_head                list;
+        struct module                   *mod;
+        struct file_operations          id;
+        struct file_operations          enable;
+        struct file_operations          format;
+        struct file_operations          filter;
+};
+
+static struct ftrace_module_file_ops *
+trace_create_file_ops(struct module *mod)
+{
+        struct ftrace_module_file_ops *file_ops;
+
+        /*
+         * This is a bit of a PITA. To allow for correct reference
+         * counting, modules must "own" their file_operations.
+         * To do this, we allocate the file operations that will be
+         * used in the event directory.
+         */
+
+        file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL);
+        if (!file_ops)
+                return NULL;
+
+        file_ops->mod = mod;
+
+        file_ops->id = ftrace_event_id_fops;
+        file_ops->id.owner = mod;
+
+        file_ops->enable = ftrace_enable_fops;
+        file_ops->enable.owner = mod;
+
+        file_ops->filter = ftrace_event_filter_fops;
+        file_ops->filter.owner = mod;
+
+        file_ops->format = ftrace_event_format_fops;
+        file_ops->format.owner = mod;
+
+        list_add(&file_ops->list, &ftrace_module_file_list);
+
+        return file_ops;
+}
+
+static void trace_module_add_events(struct module *mod)
+{
+        struct ftrace_module_file_ops *file_ops = NULL;
+        struct ftrace_event_call *call, *start, *end;
+        struct dentry *d_events;
+
+        start = mod->trace_events;
+        end = mod->trace_events + mod->num_trace_events;
+
+        if (start == end)
+                return;
+
+        d_events = event_trace_events_dir();
+        if (!d_events)
+                return;
+
+        for_each_event(call, start, end) {
+                /* The linker may leave blanks */
+                if (!call->name)
+                        continue;
+
+                /*
+                 * This module has events, create file ops for this module
+                 * if not already done.
+                 */
+                if (!file_ops) {
+                        file_ops = trace_create_file_ops(mod);
+                        if (!file_ops)
+                                return;
+                }
+                call->mod = mod;
+                list_add(&call->list, &ftrace_events);
+                event_create_dir(call, d_events,
+                                 &file_ops->id, &file_ops->enable,
+                                 &file_ops->filter, &file_ops->format);
+        }
+}
+
+static void trace_module_remove_events(struct module *mod)
+{
+        struct ftrace_module_file_ops *file_ops;
+        struct ftrace_event_call *call, *p;
+        bool found = false;
+
+        down_write(&trace_event_mutex);
+        list_for_each_entry_safe(call, p, &ftrace_events, list) {
+                if (call->mod == mod) {
+                        found = true;
+                        ftrace_event_enable_disable(call, 0);
+                        if (call->event)
+                                __unregister_ftrace_event(call->event);
+                        debugfs_remove_recursive(call->dir);
+                        list_del(&call->list);
+                        trace_destroy_fields(call);
+                        destroy_preds(call);
+                }
+        }
+
+        /* Now free the file_operations */
+        list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
+                if (file_ops->mod == mod)
+                        break;
+        }
+        if (&file_ops->list != &ftrace_module_file_list) {
+                list_del(&file_ops->list);
+                kfree(file_ops);
+        }
+
+        /*
+         * It is safest to reset the ring buffer if the module being unloaded
+         * registered any events.
+         */
+        if (found)
+                tracing_reset_current_online_cpus();
+        up_write(&trace_event_mutex);
+}
+
+static int trace_module_notify(struct notifier_block *self,
+                               unsigned long val, void *data)
+{
+        struct module *mod = data;
+
+        mutex_lock(&event_mutex);
+        switch (val) {
+        case MODULE_STATE_COMING:
+                trace_module_add_events(mod);
+                break;
+        case MODULE_STATE_GOING:
+                trace_module_remove_events(mod);
+                break;
+        }
+        mutex_unlock(&event_mutex);
 
         return 0;
 }
+#else
+static int trace_module_notify(struct notifier_block *self,
+                               unsigned long val, void *data)
+{
+        return 0;
+}
+#endif /* CONFIG_MODULES */
+
+struct notifier_block trace_module_nb = {
+        .notifier_call = trace_module_notify,
+        .priority = 0,
+};
+
+extern struct ftrace_event_call __start_ftrace_events[];
+extern struct ftrace_event_call __stop_ftrace_events[];
 
 static __init int event_trace_init(void)
 {
-        struct ftrace_event_call *call = __start_ftrace_events;
+        struct ftrace_event_call *call;
         struct dentry *d_tracer;
         struct dentry *entry;
         struct dentry *d_events;
+        int ret;
 
         d_tracer = tracing_init_dentry();
         if (!d_tracer)
@@ -816,13 +1147,243 @@ static __init int event_trace_init(void)
         if (!d_events)
                 return 0;
 
-        for_each_event(call) {
+        /* ring buffer internal formats */
+        trace_create_file("header_page", 0444, d_events,
+                          ring_buffer_print_page_header,
+                          &ftrace_show_header_fops);
+
+        trace_create_file("header_event", 0444, d_events,
+                          ring_buffer_print_entry_header,
+                          &ftrace_show_header_fops);
+
+        trace_create_file("enable", 0644, d_events,
+                          NULL, &ftrace_system_enable_fops);
+
+        for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
                 /* The linker may leave blanks */
                 if (!call->name)
                         continue;
-                event_create_dir(call, d_events);
+                list_add(&call->list, &ftrace_events);
+                event_create_dir(call, d_events, &ftrace_event_id_fops,
+                                 &ftrace_enable_fops, &ftrace_event_filter_fops,
+                                 &ftrace_event_format_fops);
         }
 
+        ret = register_module_notifier(&trace_module_nb);
+        if (ret)
+                pr_warning("Failed to register trace events module notifier\n");
+
         return 0;
 }
 fs_initcall(event_trace_init);
+
+#ifdef CONFIG_FTRACE_STARTUP_TEST
+
+static DEFINE_SPINLOCK(test_spinlock);
+static DEFINE_SPINLOCK(test_spinlock_irq);
+static DEFINE_MUTEX(test_mutex);
+
+static __init void test_work(struct work_struct *dummy)
+{
+        spin_lock(&test_spinlock);
+        spin_lock_irq(&test_spinlock_irq);
+        udelay(1);
+        spin_unlock_irq(&test_spinlock_irq);
+        spin_unlock(&test_spinlock);
+
+        mutex_lock(&test_mutex);
+        msleep(1);
+        mutex_unlock(&test_mutex);
+}
+
+static __init int event_test_thread(void *unused)
+{
+        void *test_malloc;
+
+        test_malloc = kmalloc(1234, GFP_KERNEL);
+        if (!test_malloc)
+                pr_info("failed to kmalloc\n");
+
+        schedule_on_each_cpu(test_work);
+
+        kfree(test_malloc);
+
+        set_current_state(TASK_INTERRUPTIBLE);
+        while (!kthread_should_stop())
+                schedule();
+
+        return 0;
+}
+
+/*
+ * Do various things that may trigger events.
+ */
+static __init void event_test_stuff(void)
+{
+        struct task_struct *test_thread;
+
+        test_thread = kthread_run(event_test_thread, NULL, "test-events");
+        msleep(1);
+        kthread_stop(test_thread);
+}
+
+/*
+ * For every trace event defined, we will test each trace point separately,
+ * and then by groups, and finally all trace points.
+ */
+static __init void event_trace_self_tests(void)
+{
+        struct ftrace_event_call *call;
+        struct event_subsystem *system;
+        int ret;
+
+        pr_info("Running tests on trace events:\n");
+
+        list_for_each_entry(call, &ftrace_events, list) {
+
+                /* Only test those that have a regfunc */
+                if (!call->regfunc)
+                        continue;
+
+                pr_info("Testing event %s: ", call->name);
+
+                /*
+                 * If an event is already enabled, someone is using
+                 * it and the self test should not be on.
+                 */
+                if (call->enabled) {
+                        pr_warning("Enabled event during self test!\n");
+                        WARN_ON_ONCE(1);
+                        continue;
+                }
+
+                ftrace_event_enable_disable(call, 1);
+                event_test_stuff();
+                ftrace_event_enable_disable(call, 0);
+
+                pr_cont("OK\n");
+        }
+
+        /* Now test at the sub system level */
+
+        pr_info("Running tests on trace event systems:\n");
+
+        list_for_each_entry(system, &event_subsystems, list) {
+
+                /* the ftrace system is special, skip it */
+                if (strcmp(system->name, "ftrace") == 0)
+                        continue;
+
+                pr_info("Testing event system %s: ", system->name);
+
+                ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1);
+                if (WARN_ON_ONCE(ret)) {
+                        pr_warning("error enabling system %s\n",
+                                   system->name);
+                        continue;
+                }
+
+                event_test_stuff();
+
+                ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0);
+                if (WARN_ON_ONCE(ret))
+                        pr_warning("error disabling system %s\n",
+                                   system->name);
+
+                pr_cont("OK\n");
+        }
+
+        /* Test with all events enabled */
+
+        pr_info("Running tests on all trace events:\n");
+        pr_info("Testing all events: ");
+
+        ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1);
+        if (WARN_ON_ONCE(ret)) {
+                pr_warning("error enabling all events\n");
+                return;
+        }
+
+        event_test_stuff();
+
+        /* reset sysname */
+        ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0);
+        if (WARN_ON_ONCE(ret)) {
+                pr_warning("error disabling all events\n");
+                return;
+        }
+
+        pr_cont("OK\n");
+}
+
+#ifdef CONFIG_FUNCTION_TRACER
+
+static DEFINE_PER_CPU(atomic_t, test_event_disable);
+
+static void
+function_test_events_call(unsigned long ip, unsigned long parent_ip)
+{
+        struct ring_buffer_event *event;
+        struct ftrace_entry *entry;
+        unsigned long flags;
+        long disabled;
+        int resched;
+        int cpu;
+        int pc;
+
+        pc = preempt_count();
+        resched = ftrace_preempt_disable();
+        cpu = raw_smp_processor_id();
+        disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu));
+
+        if (disabled != 1)
+                goto out;
+
+        local_save_flags(flags);
+
+        event = trace_current_buffer_lock_reserve(TRACE_FN, sizeof(*entry),
+                                                  flags, pc);
+        if (!event)
+                goto out;
+        entry   = ring_buffer_event_data(event);
+        entry->ip                       = ip;
+        entry->parent_ip                = parent_ip;
+
+        trace_nowake_buffer_unlock_commit(event, flags, pc);
+
+ out:
+        atomic_dec(&per_cpu(test_event_disable, cpu));
+        ftrace_preempt_enable(resched);
+}
+
+static struct ftrace_ops trace_ops __initdata  =
+{
+        .func = function_test_events_call,
+};
+
+static __init void event_trace_self_test_with_function(void)
+{
+        register_ftrace_function(&trace_ops);
+        pr_info("Running tests again, along with the function tracer\n");
+        event_trace_self_tests();
+        unregister_ftrace_function(&trace_ops);
+}
+#else
+static __init void event_trace_self_test_with_function(void)
+{
+}
+#endif
+
+static __init int event_trace_self_tests_init(void)
+{
+
+        event_trace_self_tests();
+
+        event_trace_self_test_with_function();
+
+        return 0;
+}
+
+late_initcall(event_trace_self_tests_init);
+
+#endif
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index e03cbf1e38f3..936c621bbf46 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -22,119 +22,295 @@
 #include <linux/uaccess.h>
 #include <linux/module.h>
 #include <linux/ctype.h>
+#include <linux/mutex.h>
 
 #include "trace.h"
 #include "trace_output.h"
 
-static int filter_pred_64(struct filter_pred *pred, void *event)
+enum filter_op_ids
 {
-        u64 *addr = (u64 *)(event + pred->offset);
-        u64 val = (u64)pred->val;
-        int match;
+        OP_OR,
+        OP_AND,
+        OP_NE,
+        OP_EQ,
+        OP_LT,
+        OP_LE,
+        OP_GT,
+        OP_GE,
+        OP_NONE,
+        OP_OPEN_PAREN,
+};
+
+struct filter_op {
+        int id;
+        char *string;
+        int precedence;
+};
+
+static struct filter_op filter_ops[] = {
+        { OP_OR, "||", 1 },
+        { OP_AND, "&&", 2 },
+        { OP_NE, "!=", 4 },
+        { OP_EQ, "==", 4 },
+        { OP_LT, "<", 5 },
+        { OP_LE, "<=", 5 },
+        { OP_GT, ">", 5 },
+        { OP_GE, ">=", 5 },
+        { OP_NONE, "OP_NONE", 0 },
+        { OP_OPEN_PAREN, "(", 0 },
+};
+
+enum {
+        FILT_ERR_NONE,
+        FILT_ERR_INVALID_OP,
+        FILT_ERR_UNBALANCED_PAREN,
+        FILT_ERR_TOO_MANY_OPERANDS,
+        FILT_ERR_OPERAND_TOO_LONG,
+        FILT_ERR_FIELD_NOT_FOUND,
+        FILT_ERR_ILLEGAL_FIELD_OP,
+        FILT_ERR_ILLEGAL_INTVAL,
+        FILT_ERR_BAD_SUBSYS_FILTER,
+        FILT_ERR_TOO_MANY_PREDS,
+        FILT_ERR_MISSING_FIELD,
+        FILT_ERR_INVALID_FILTER,
+};
+
+static char *err_text[] = {
+        "No error",
+        "Invalid operator",
+        "Unbalanced parens",
+        "Too many operands",
+        "Operand too long",
+        "Field not found",
+        "Illegal operation for field type",
+        "Illegal integer value",
+        "Couldn't find or set field in one of a subsystem's events",
+        "Too many terms in predicate expression",
+        "Missing field name and/or value",
+        "Meaningless filter expression",
+};
+
+struct opstack_op {
+        int op;
+        struct list_head list;
+};
+
+struct postfix_elt {
+        int op;
+        char *operand;
+        struct list_head list;
+};
+
+struct filter_parse_state {
+        struct filter_op *ops;
+        struct list_head opstack;
+        struct list_head postfix;
+        int lasterr;
+        int lasterr_pos;
+
+        struct {
+                char *string;
+                unsigned int cnt;
+                unsigned int tail;
+        } infix;
+
+        struct {
+                char string[MAX_FILTER_STR_VAL];
+                int pos;
+                unsigned int tail;
+        } operand;
+};
+
+DEFINE_COMPARISON_PRED(s64);
+DEFINE_COMPARISON_PRED(u64);
+DEFINE_COMPARISON_PRED(s32);
+DEFINE_COMPARISON_PRED(u32);
+DEFINE_COMPARISON_PRED(s16);
+DEFINE_COMPARISON_PRED(u16);
+DEFINE_COMPARISON_PRED(s8);
+DEFINE_COMPARISON_PRED(u8);
+
+DEFINE_EQUALITY_PRED(64);
+DEFINE_EQUALITY_PRED(32);
+DEFINE_EQUALITY_PRED(16);
+DEFINE_EQUALITY_PRED(8);
+
+static int filter_pred_and(struct filter_pred *pred __attribute((unused)),
+                           void *event __attribute((unused)),
+                           int val1, int val2)
+{
+        return val1 && val2;
+}
+
+static int filter_pred_or(struct filter_pred *pred __attribute((unused)),
+                          void *event __attribute((unused)),
+                          int val1, int val2)
+{
+        return val1 || val2;
+}
+
+/* Filter predicate for fixed sized arrays of characters */
+static int filter_pred_string(struct filter_pred *pred, void *event,
+                              int val1, int val2)
+{
+        char *addr = (char *)(event + pred->offset);
+        int cmp, match;
 
-        match = (val == *addr) ^ pred->not;
+        cmp = strncmp(addr, pred->str_val, pred->str_len);
+
+        match = (!cmp) ^ pred->not;
 
         return match;
 }
 
-static int filter_pred_32(struct filter_pred *pred, void *event)
+/*
+ * Filter predicate for dynamic sized arrays of characters.
+ * These are implemented through a list of strings at the end
+ * of the entry.
+ * Also each of these strings have a field in the entry which
+ * contains its offset from the beginning of the entry.
+ * We have then first to get this field, dereference it
+ * and add it to the address of the entry, and at last we have
+ * the address of the string.
+ */
+static int filter_pred_strloc(struct filter_pred *pred, void *event,
+                              int val1, int val2)
 {
-        u32 *addr = (u32 *)(event + pred->offset);
-        u32 val = (u32)pred->val;
-        int match;
+        unsigned short str_loc = *(unsigned short *)(event + pred->offset);
+        char *addr = (char *)(event + str_loc);
+        int cmp, match;
 
-        match = (val == *addr) ^ pred->not;
+        cmp = strncmp(addr, pred->str_val, pred->str_len);
+
+        match = (!cmp) ^ pred->not;
 
         return match;
 }
 
-static int filter_pred_16(struct filter_pred *pred, void *event)
+static int filter_pred_none(struct filter_pred *pred, void *event,
+                            int val1, int val2)
+{
+        return 0;
+}
+
+/* return 1 if event matches, 0 otherwise (discard) */
+int filter_match_preds(struct ftrace_event_call *call, void *rec)
 {
-        u16 *addr = (u16 *)(event + pred->offset);
-        u16 val = (u16)pred->val;
-        int match;
+        struct event_filter *filter = call->filter;
+        int match, top = 0, val1 = 0, val2 = 0;
+        int stack[MAX_FILTER_PRED];
+        struct filter_pred *pred;
+        int i;
 
-        match = (val == *addr) ^ pred->not;
+        for (i = 0; i < filter->n_preds; i++) {
+                pred = filter->preds[i];
+                if (!pred->pop_n) {
+                        match = pred->fn(pred, rec, val1, val2);
+                        stack[top++] = match;
+                        continue;
+                }
+                if (pred->pop_n > top) {
+                        WARN_ON_ONCE(1);
+                        return 0;
+                }
+                val1 = stack[--top];
+                val2 = stack[--top];
+                match = pred->fn(pred, rec, val1, val2);
+                stack[top++] = match;
+        }
 
-        return match;
+        return stack[--top];
 }
+EXPORT_SYMBOL_GPL(filter_match_preds);
 
-static int filter_pred_8(struct filter_pred *pred, void *event)
+static void parse_error(struct filter_parse_state *ps, int err, int pos)
 {
-        u8 *addr = (u8 *)(event + pred->offset);
-        u8 val = (u8)pred->val;
-        int match;
+        ps->lasterr = err;
+        ps->lasterr_pos = pos;
+}
 
-        match = (val == *addr) ^ pred->not;
+static void remove_filter_string(struct event_filter *filter)
+{
+        kfree(filter->filter_string);
+        filter->filter_string = NULL;
+}
 
-        return match;
+static int replace_filter_string(struct event_filter *filter,
+                                 char *filter_string)
+{
+        kfree(filter->filter_string);
+        filter->filter_string = kstrdup(filter_string, GFP_KERNEL);
+        if (!filter->filter_string)
+                return -ENOMEM;
+
+        return 0;
 }
 
-static int filter_pred_string(struct filter_pred *pred, void *event)
+static int append_filter_string(struct event_filter *filter,
+                                char *string)
 {
-        char *addr = (char *)(event + pred->offset);
-        int cmp, match;
+        int newlen;
+        char *new_filter_string;
 
-        cmp = strncmp(addr, pred->str_val, pred->str_len);
+        BUG_ON(!filter->filter_string);
+        newlen = strlen(filter->filter_string) + strlen(string) + 1;
+        new_filter_string = kmalloc(newlen, GFP_KERNEL);
+        if (!new_filter_string)
+                return -ENOMEM;
 
-        match = (!cmp) ^ pred->not;
+        strcpy(new_filter_string, filter->filter_string);
+        strcat(new_filter_string, string);
+        kfree(filter->filter_string);
+        filter->filter_string = new_filter_string;
 
-        return match;
+        return 0;
 }
 
-/* return 1 if event matches, 0 otherwise (discard) */
-int filter_match_preds(struct ftrace_event_call *call, void *rec)
+static void append_filter_err(struct filter_parse_state *ps,
+                              struct event_filter *filter)
 {
-        int i, matched, and_failed = 0;
-        struct filter_pred *pred;
+        int pos = ps->lasterr_pos;
+        char *buf, *pbuf;
 
-        for (i = 0; i < MAX_FILTER_PRED; i++) {
-                if (call->preds[i]) {
-                        pred = call->preds[i];
-                        if (and_failed && !pred->or)
-                                continue;
-                        matched = pred->fn(pred, rec);
-                        if (!matched && !pred->or) {
-                                and_failed = 1;
-                                continue;
-                        } else if (matched && pred->or)
-                                return 1;
-                } else
-                        break;
-        }
+        buf = (char *)__get_free_page(GFP_TEMPORARY);
+        if (!buf)
+                return;
 
-        if (and_failed)
-                return 0;
+        append_filter_string(filter, "\n");
+        memset(buf, ' ', PAGE_SIZE);
+        if (pos > PAGE_SIZE - 128)
+                pos = 0;
+        buf[pos] = '^';
+        pbuf = &buf[pos] + 1;
 
-        return 1;
+        sprintf(pbuf, "\nparse_error: %s\n", err_text[ps->lasterr]);
+        append_filter_string(filter, buf);
+        free_page((unsigned long) buf);
 }
 
-void filter_print_preds(struct filter_pred **preds, struct trace_seq *s)
+void print_event_filter(struct ftrace_event_call *call, struct trace_seq *s)
 {
-        char *field_name;
-        struct filter_pred *pred;
-        int i;
+        struct event_filter *filter = call->filter;
 
-        if (!preds) {
+        mutex_lock(&event_mutex);
+        if (filter->filter_string)
+                trace_seq_printf(s, "%s\n", filter->filter_string);
+        else
                 trace_seq_printf(s, "none\n");
-                return;
-        }
+        mutex_unlock(&event_mutex);
+}
 
-        for (i = 0; i < MAX_FILTER_PRED; i++) {
-                if (preds[i]) {
-                        pred = preds[i];
-                        field_name = pred->field_name;
-                        if (i)
-                                trace_seq_printf(s, pred->or ? "|| " : "&& ");
-                        trace_seq_printf(s, "%s ", field_name);
-                        trace_seq_printf(s, pred->not ? "!= " : "== ");
-                        if (pred->str_val)
-                                trace_seq_printf(s, "%s\n", pred->str_val);
-                        else
-                                trace_seq_printf(s, "%llu\n", pred->val);
-                } else
-                        break;
-        }
+void print_subsystem_event_filter(struct event_subsystem *system,
+                                  struct trace_seq *s)
+{
+        struct event_filter *filter = system->filter;
+
+        mutex_lock(&event_mutex);
+        if (filter->filter_string)
+                trace_seq_printf(s, "%s\n", filter->filter_string);
+        else
+                trace_seq_printf(s, "none\n");
+        mutex_unlock(&event_mutex);
 }
 
 static struct ftrace_event_field *
@@ -150,284 +326,829 @@ find_event_field(struct ftrace_event_call *call, char *name)
         return NULL;
 }
 
-void filter_free_pred(struct filter_pred *pred)
+static void filter_free_pred(struct filter_pred *pred)
 {
         if (!pred)
                 return;
 
         kfree(pred->field_name);
-        kfree(pred->str_val);
         kfree(pred);
 }
 
-void filter_free_preds(struct ftrace_event_call *call)
+static void filter_clear_pred(struct filter_pred *pred)
 {
-        int i;
+        kfree(pred->field_name);
+        pred->field_name = NULL;
+        pred->str_len = 0;
+}
 
-        if (call->preds) {
-                for (i = 0; i < MAX_FILTER_PRED; i++)
-                        filter_free_pred(call->preds[i]);
-                kfree(call->preds);
-                call->preds = NULL;
+static int filter_set_pred(struct filter_pred *dest,
+                           struct filter_pred *src,
+                           filter_pred_fn_t fn)
+{
+        *dest = *src;
+        if (src->field_name) {
+                dest->field_name = kstrdup(src->field_name, GFP_KERNEL);
+                if (!dest->field_name)
+                        return -ENOMEM;
         }
+        dest->fn = fn;
+
+        return 0;
 }
 
-void filter_free_subsystem_preds(struct event_subsystem *system)
+static void filter_disable_preds(struct ftrace_event_call *call)
 {
-        struct ftrace_event_call *call = __start_ftrace_events;
+        struct event_filter *filter = call->filter;
         int i;
 
-        if (system->preds) {
-                for (i = 0; i < MAX_FILTER_PRED; i++)
-                        filter_free_pred(system->preds[i]);
-                kfree(system->preds);
-                system->preds = NULL;
-        }
+        call->filter_active = 0;
+        filter->n_preds = 0;
 
-        events_for_each(call) {
-                if (!call->name || !call->regfunc)
-                        continue;
+        for (i = 0; i < MAX_FILTER_PRED; i++)
+                filter->preds[i]->fn = filter_pred_none;
+}
+
+void destroy_preds(struct ftrace_event_call *call)
+{
+        struct event_filter *filter = call->filter;
+        int i;
 
-                if (!strcmp(call->system, system->name))
-                        filter_free_preds(call);
+        for (i = 0; i < MAX_FILTER_PRED; i++) {
+                if (filter->preds[i])
+                        filter_free_pred(filter->preds[i]);
         }
+        kfree(filter->preds);
+        kfree(filter->filter_string);
+        kfree(filter);
+        call->filter = NULL;
 }
 
-static int __filter_add_pred(struct ftrace_event_call *call,
-                             struct filter_pred *pred)
+int init_preds(struct ftrace_event_call *call)
 {
+        struct event_filter *filter;
+        struct filter_pred *pred;
         int i;
 
-        if (call->preds && !pred->compound)
-                filter_free_preds(call);
+        filter = call->filter = kzalloc(sizeof(*filter), GFP_KERNEL);
+        if (!call->filter)
+                return -ENOMEM;
 
-        if (!call->preds) {
-                call->preds = kzalloc(MAX_FILTER_PRED * sizeof(pred),
-                                      GFP_KERNEL);
-                if (!call->preds)
-                        return -ENOMEM;
-        }
+        call->filter_active = 0;
+        filter->n_preds = 0;
+
+        filter->preds = kzalloc(MAX_FILTER_PRED * sizeof(pred), GFP_KERNEL);
+        if (!filter->preds)
+                goto oom;
 
         for (i = 0; i < MAX_FILTER_PRED; i++) {
-                if (!call->preds[i]) {
-                        call->preds[i] = pred;
-                        return 0;
+                pred = kzalloc(sizeof(*pred), GFP_KERNEL);
+                if (!pred)
+                        goto oom;
+                pred->fn = filter_pred_none;
+                filter->preds[i] = pred;
+        }
+
+        return 0;
+
+oom:
+        destroy_preds(call);
+
+        return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(init_preds);
+
+static void filter_free_subsystem_preds(struct event_subsystem *system)
+{
+        struct event_filter *filter = system->filter;
+        struct ftrace_event_call *call;
+        int i;
+
+        if (filter->n_preds) {
+                for (i = 0; i < filter->n_preds; i++)
+                        filter_free_pred(filter->preds[i]);
+                kfree(filter->preds);
+                filter->preds = NULL;
+                filter->n_preds = 0;
+        }
+
+        list_for_each_entry(call, &ftrace_events, list) {
+                if (!call->define_fields)
+                        continue;
+
+                if (!strcmp(call->system, system->name)) {
+                        filter_disable_preds(call);
+                        remove_filter_string(call->filter);
                 }
         }
+}
+
+static int filter_add_pred_fn(struct filter_parse_state *ps,
+                              struct ftrace_event_call *call,
+                              struct filter_pred *pred,
+                              filter_pred_fn_t fn)
+{
+        struct event_filter *filter = call->filter;
+        int idx, err;
+
+        if (filter->n_preds == MAX_FILTER_PRED) {
+                parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0);
+                return -ENOSPC;
+        }
+
+        idx = filter->n_preds;
+        filter_clear_pred(filter->preds[idx]);
+        err = filter_set_pred(filter->preds[idx], pred, fn);
+        if (err)
+                return err;
+
+        filter->n_preds++;
+        call->filter_active = 1;
 
-        return -ENOSPC;
+        return 0;
 }
 
+enum {
+        FILTER_STATIC_STRING = 1,
+        FILTER_DYN_STRING
+};
+
 static int is_string_field(const char *type)
 {
+        if (strstr(type, "__data_loc") && strstr(type, "char"))
+                return FILTER_DYN_STRING;
+
         if (strchr(type, '[') && strstr(type, "char"))
-                return 1;
+                return FILTER_STATIC_STRING;
 
         return 0;
 }
 
-int filter_add_pred(struct ftrace_event_call *call, struct filter_pred *pred)
+static int is_legal_op(struct ftrace_event_field *field, int op)
 {
-        struct ftrace_event_field *field;
-
-        field = find_event_field(call, pred->field_name);
-        if (!field)
-                return -EINVAL;
+        if (is_string_field(field->type) && (op != OP_EQ && op != OP_NE))
+                return 0;
 
-        pred->offset = field->offset;
+        return 1;
+}
 
-        if (is_string_field(field->type)) {
-                if (!pred->str_val)
-                        return -EINVAL;
-                pred->fn = filter_pred_string;
-                pred->str_len = field->size;
-                return __filter_add_pred(call, pred);
-        } else {
-                if (pred->str_val)
-                        return -EINVAL;
-        }
+static filter_pred_fn_t select_comparison_fn(int op, int field_size,
+                                             int field_is_signed)
+{
+        filter_pred_fn_t fn = NULL;
 
-        switch (field->size) {
+        switch (field_size) {
         case 8:
-                pred->fn = filter_pred_64;
+                if (op == OP_EQ || op == OP_NE)
+                        fn = filter_pred_64;
+                else if (field_is_signed)
+                        fn = filter_pred_s64;
+                else
+                        fn = filter_pred_u64;
                 break;
         case 4:
-                pred->fn = filter_pred_32;
+                if (op == OP_EQ || op == OP_NE)
+                        fn = filter_pred_32;
+                else if (field_is_signed)
+                        fn = filter_pred_s32;
+                else
+                        fn = filter_pred_u32;
                 break;
         case 2:
-                pred->fn = filter_pred_16;
+                if (op == OP_EQ || op == OP_NE)
+                        fn = filter_pred_16;
+                else if (field_is_signed)
+                        fn = filter_pred_s16;
+                else
+                        fn = filter_pred_u16;
                 break;
         case 1:
-                pred->fn = filter_pred_8;
+                if (op == OP_EQ || op == OP_NE)
+                        fn = filter_pred_8;
+                else if (field_is_signed)
+                        fn = filter_pred_s8;
+                else
+                        fn = filter_pred_u8;
                 break;
-        default:
-                return -EINVAL;
         }
 
-        return __filter_add_pred(call, pred);
+        return fn;
 }
 
-static struct filter_pred *copy_pred(struct filter_pred *pred)
+static int filter_add_pred(struct filter_parse_state *ps,
+                           struct ftrace_event_call *call,
+                           struct filter_pred *pred)
 {
-        struct filter_pred *new_pred = kmalloc(sizeof(*pred), GFP_KERNEL);
-        if (!new_pred)
-                return NULL;
+        struct ftrace_event_field *field;
+        filter_pred_fn_t fn;
+        unsigned long long val;
+        int string_type;
+        int ret;
+
+        pred->fn = filter_pred_none;
+
+        if (pred->op == OP_AND) {
+                pred->pop_n = 2;
+                return filter_add_pred_fn(ps, call, pred, filter_pred_and);
+        } else if (pred->op == OP_OR) {
+                pred->pop_n = 2;
+                return filter_add_pred_fn(ps, call, pred, filter_pred_or);
+        }
+
+        field = find_event_field(call, pred->field_name);
+        if (!field) {
+                parse_error(ps, FILT_ERR_FIELD_NOT_FOUND, 0);
+                return -EINVAL;
+        }
 
-        memcpy(new_pred, pred, sizeof(*pred));
+        pred->offset = field->offset;
 
-        if (pred->field_name) {
-                new_pred->field_name = kstrdup(pred->field_name, GFP_KERNEL);
-                if (!new_pred->field_name) {
-                        kfree(new_pred);
-                        return NULL;
-                }
+        if (!is_legal_op(field, pred->op)) {
+                parse_error(ps, FILT_ERR_ILLEGAL_FIELD_OP, 0);
+                return -EINVAL;
         }
 
-        if (pred->str_val) {
-                new_pred->str_val = kstrdup(pred->str_val, GFP_KERNEL);
-                if (!new_pred->str_val) {
-                        filter_free_pred(new_pred);
-                        return NULL;
+        string_type = is_string_field(field->type);
+        if (string_type) {
+                if (string_type == FILTER_STATIC_STRING)
+                        fn = filter_pred_string;
+                else
+                        fn = filter_pred_strloc;
+                pred->str_len = field->size;
+                if (pred->op == OP_NE)
+                        pred->not = 1;
+                return filter_add_pred_fn(ps, call, pred, fn);
+        } else {
+                if (field->is_signed)
+                        ret = strict_strtoll(pred->str_val, 0, &val);
+                else
+                        ret = strict_strtoull(pred->str_val, 0, &val);
+                if (ret) {
+                        parse_error(ps, FILT_ERR_ILLEGAL_INTVAL, 0);
+                        return -EINVAL;
                 }
+                pred->val = val;
+        }
+
+        fn = select_comparison_fn(pred->op, field->size, field->is_signed);
+        if (!fn) {
+                parse_error(ps, FILT_ERR_INVALID_OP, 0);
+                return -EINVAL;
         }
 
-        return new_pred;
+        if (pred->op == OP_NE)
+                pred->not = 1;
+
+        return filter_add_pred_fn(ps, call, pred, fn);
 }
 
-int filter_add_subsystem_pred(struct event_subsystem *system,
-                              struct filter_pred *pred)
+static int filter_add_subsystem_pred(struct filter_parse_state *ps,
+                                     struct event_subsystem *system,
+                                     struct filter_pred *pred,
+                                     char *filter_string)
 {
-        struct ftrace_event_call *call = __start_ftrace_events;
-        struct filter_pred *event_pred;
-        int i;
+        struct event_filter *filter = system->filter;
+        struct ftrace_event_call *call;
+        int err = 0;
 
-        if (system->preds && !pred->compound)
-                filter_free_subsystem_preds(system);
-
-        if (!system->preds) {
-                system->preds = kzalloc(MAX_FILTER_PRED * sizeof(pred),
+        if (!filter->preds) {
+                filter->preds = kzalloc(MAX_FILTER_PRED * sizeof(pred),
                                         GFP_KERNEL);
-                if (!system->preds)
+
+                if (!filter->preds)
                         return -ENOMEM;
         }
 
-        for (i = 0; i < MAX_FILTER_PRED; i++) {
-                if (!system->preds[i]) {
-                        system->preds[i] = pred;
-                        break;
-                }
+        if (filter->n_preds == MAX_FILTER_PRED) {
+                parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0);
+                return -ENOSPC;
         }
 
-        if (i == MAX_FILTER_PRED)
-                return -ENOSPC;
+        filter->preds[filter->n_preds] = pred;
+        filter->n_preds++;
 
-        events_for_each(call) {
-                int err;
+        list_for_each_entry(call, &ftrace_events, list) {
 
-                if (!call->name || !call->regfunc)
+                if (!call->define_fields)
                         continue;
 
                 if (strcmp(call->system, system->name))
                         continue;
 
-                if (!find_event_field(call, pred->field_name))
-                        continue;
+                err = filter_add_pred(ps, call, pred);
+                if (err) {
+                        filter_free_subsystem_preds(system);
+                        parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0);
+                        goto out;
+                }
+                replace_filter_string(call->filter, filter_string);
+        }
+out:
+        return err;
+}
 
-                event_pred = copy_pred(pred);
-                if (!event_pred)
-                        goto oom;
+static void parse_init(struct filter_parse_state *ps,
+                       struct filter_op *ops,
+                       char *infix_string)
+{
+        memset(ps, '\0', sizeof(*ps));
 
-                err = filter_add_pred(call, event_pred);
-                if (err)
-                        filter_free_pred(event_pred);
-                if (err == -ENOMEM)
-                        goto oom;
+        ps->infix.string = infix_string;
+        ps->infix.cnt = strlen(infix_string);
+        ps->ops = ops;
+
+        INIT_LIST_HEAD(&ps->opstack);
+        INIT_LIST_HEAD(&ps->postfix);
+}
+
+static char infix_next(struct filter_parse_state *ps)
+{
+        ps->infix.cnt--;
+
+        return ps->infix.string[ps->infix.tail++];
+}
+
+static char infix_peek(struct filter_parse_state *ps)
+{
+        if (ps->infix.tail == strlen(ps->infix.string))
+                return 0;
+
+        return ps->infix.string[ps->infix.tail];
+}
+
+static void infix_advance(struct filter_parse_state *ps)
+{
+        ps->infix.cnt--;
+        ps->infix.tail++;
+}
+
+static inline int is_precedence_lower(struct filter_parse_state *ps,
+                                      int a, int b)
+{
+        return ps->ops[a].precedence < ps->ops[b].precedence;
+}
+
+static inline int is_op_char(struct filter_parse_state *ps, char c)
+{
+        int i;
+
+        for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) {
+                if (ps->ops[i].string[0] == c)
+                        return 1;
         }
 
         return 0;
+}
 
-oom:
-        system->preds[i] = NULL;
-        return -ENOMEM;
+static int infix_get_op(struct filter_parse_state *ps, char firstc)
+{
+        char nextc = infix_peek(ps);
+        char opstr[3];
+        int i;
+
+        opstr[0] = firstc;
+        opstr[1] = nextc;
+        opstr[2] = '\0';
+
+        for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) {
+                if (!strcmp(opstr, ps->ops[i].string)) {
+                        infix_advance(ps);
+                        return ps->ops[i].id;
+                }
+        }
+
+        opstr[1] = '\0';
+
+        for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) {
+                if (!strcmp(opstr, ps->ops[i].string))
+                        return ps->ops[i].id;
+        }
+
+        return OP_NONE;
 }
 
-int filter_parse(char **pbuf, struct filter_pred *pred)
+static inline void clear_operand_string(struct filter_parse_state *ps)
 {
-        char *tmp, *tok, *val_str = NULL;
-        int tok_n = 0;
+        memset(ps->operand.string, '\0', MAX_FILTER_STR_VAL);
+        ps->operand.tail = 0;
+}
 
-        /* field ==/!= number, or/and field ==/!= number, number */
-        while ((tok = strsep(pbuf, " \n"))) {
-                if (tok_n == 0) {
-                        if (!strcmp(tok, "0")) {
-                                pred->clear = 1;
-                                return 0;
-                        } else if (!strcmp(tok, "&&")) {
-                                pred->or = 0;
-                                pred->compound = 1;
-                        } else if (!strcmp(tok, "||")) {
-                                pred->or = 1;
-                                pred->compound = 1;
-                        } else
-                                pred->field_name = tok;
-                        tok_n = 1;
+static inline int append_operand_char(struct filter_parse_state *ps, char c)
+{
+        if (ps->operand.tail == MAX_FILTER_STR_VAL - 1)
+                return -EINVAL;
+
+        ps->operand.string[ps->operand.tail++] = c;
+
+        return 0;
+}
+
+static int filter_opstack_push(struct filter_parse_state *ps, int op)
+{
+        struct opstack_op *opstack_op;
+
+        opstack_op = kmalloc(sizeof(*opstack_op), GFP_KERNEL);
+        if (!opstack_op)
+                return -ENOMEM;
+
+        opstack_op->op = op;
+        list_add(&opstack_op->list, &ps->opstack);
+
+        return 0;
+}
+
+static int filter_opstack_empty(struct filter_parse_state *ps)
+{
+        return list_empty(&ps->opstack);
+}
+
+static int filter_opstack_top(struct filter_parse_state *ps)
+{
+        struct opstack_op *opstack_op;
+
+        if (filter_opstack_empty(ps))
+                return OP_NONE;
+
+        opstack_op = list_first_entry(&ps->opstack, struct opstack_op, list);
+
+        return opstack_op->op;
+}
+
+static int filter_opstack_pop(struct filter_parse_state *ps)
+{
+        struct opstack_op *opstack_op;
+        int op;
+
+        if (filter_opstack_empty(ps))
+                return OP_NONE;
+
+        opstack_op = list_first_entry(&ps->opstack, struct opstack_op, list);
+        op = opstack_op->op;
+        list_del(&opstack_op->list);
+
+        kfree(opstack_op);
+
+        return op;
+}
+
+static void filter_opstack_clear(struct filter_parse_state *ps)
+{
+        while (!filter_opstack_empty(ps))
+                filter_opstack_pop(ps);
+}
+
+static char *curr_operand(struct filter_parse_state *ps)
+{
+        return ps->operand.string;
+}
+
+static int postfix_append_operand(struct filter_parse_state *ps, char *operand)
+{
+        struct postfix_elt *elt;
+
+        elt = kmalloc(sizeof(*elt), GFP_KERNEL);
+        if (!elt)
+                return -ENOMEM;
+
+        elt->op = OP_NONE;
+        elt->operand = kstrdup(operand, GFP_KERNEL);
+        if (!elt->operand) {
+                kfree(elt);
+                return -ENOMEM;
+        }
+
+        list_add_tail(&elt->list, &ps->postfix);
+
+        return 0;
+}
+
+static int postfix_append_op(struct filter_parse_state *ps, int op)
+{
+        struct postfix_elt *elt;
+
+        elt = kmalloc(sizeof(*elt), GFP_KERNEL);
+        if (!elt)
+                return -ENOMEM;
+
+        elt->op = op;
+        elt->operand = NULL;
+
+        list_add_tail(&elt->list, &ps->postfix);
+
+        return 0;
+}
+
+static void postfix_clear(struct filter_parse_state *ps)
+{
+        struct postfix_elt *elt;
+
+        while (!list_empty(&ps->postfix)) {
+                elt = list_first_entry(&ps->postfix, struct postfix_elt, list);
+                kfree(elt->operand);
+                list_del(&elt->list);
+        }
+}
+
+static int filter_parse(struct filter_parse_state *ps)
+{
+        int in_string = 0;
+        int op, top_op;
+        char ch;
+
+        while ((ch = infix_next(ps))) {
+                if (ch == '"') {
+                        in_string ^= 1;
                         continue;
                 }
-                if (tok_n == 1) {
-                        if (!pred->field_name)
-                                pred->field_name = tok;
-                        else if (!strcmp(tok, "!="))
-                                pred->not = 1;
-                        else if (!strcmp(tok, "=="))
-                                pred->not = 0;
-                        else {
-                                pred->field_name = NULL;
+
+                if (in_string)
+                        goto parse_operand;
+
+                if (isspace(ch))
+                        continue;
+
+                if (is_op_char(ps, ch)) {
+                        op = infix_get_op(ps, ch);
+                        if (op == OP_NONE) {
+                                parse_error(ps, FILT_ERR_INVALID_OP, 0);
                                 return -EINVAL;
                         }
-                        tok_n = 2;
+
+                        if (strlen(curr_operand(ps))) {
+                                postfix_append_operand(ps, curr_operand(ps));
+                                clear_operand_string(ps);
+                        }
+
+                        while (!filter_opstack_empty(ps)) {
+                                top_op = filter_opstack_top(ps);
+                                if (!is_precedence_lower(ps, top_op, op)) {
+                                        top_op = filter_opstack_pop(ps);
+                                        postfix_append_op(ps, top_op);
+                                        continue;
+                                }
+                                break;
+                        }
+
+                        filter_opstack_push(ps, op);
                         continue;
                 }
-                if (tok_n == 2) {
-                        if (pred->compound) {
-                                if (!strcmp(tok, "!="))
-                                        pred->not = 1;
-                                else if (!strcmp(tok, "=="))
-                                        pred->not = 0;
-                                else {
-                                        pred->field_name = NULL;
-                                        return -EINVAL;
-                                }
-                        } else {
-                                val_str = tok;
-                                break; /* done */
+
+                if (ch == '(') {
+                        filter_opstack_push(ps, OP_OPEN_PAREN);
+                        continue;
+                }
+
+                if (ch == ')') {
+                        if (strlen(curr_operand(ps))) {
+                                postfix_append_operand(ps, curr_operand(ps));
+                                clear_operand_string(ps);
+                        }
+
+                        top_op = filter_opstack_pop(ps);
+                        while (top_op != OP_NONE) {
+                                if (top_op == OP_OPEN_PAREN)
+                                        break;
+                                postfix_append_op(ps, top_op);
+                                top_op = filter_opstack_pop(ps);
+                        }
+                        if (top_op == OP_NONE) {
+                                parse_error(ps, FILT_ERR_UNBALANCED_PAREN, 0);
+                                return -EINVAL;
                         }
-                        tok_n = 3;
                         continue;
                 }
-                if (tok_n == 3) {
-                        val_str = tok;
-                        break; /* done */
+parse_operand:
+                if (append_operand_char(ps, ch)) {
+                        parse_error(ps, FILT_ERR_OPERAND_TOO_LONG, 0);
+                        return -EINVAL;
                 }
         }
 
-        if (!val_str) {
-                pred->field_name = NULL;
-                return -EINVAL;
+        if (strlen(curr_operand(ps)))
+                postfix_append_operand(ps, curr_operand(ps));
+
+        while (!filter_opstack_empty(ps)) {
+                top_op = filter_opstack_pop(ps);
+                if (top_op == OP_NONE)
+                        break;
+                if (top_op == OP_OPEN_PAREN) {
+                        parse_error(ps, FILT_ERR_UNBALANCED_PAREN, 0);
+                        return -EINVAL;
+                }
+                postfix_append_op(ps, top_op);
         }
 
-        pred->field_name = kstrdup(pred->field_name, GFP_KERNEL);
-        if (!pred->field_name)
-                return -ENOMEM;
+        return 0;
+}
 
-        pred->val = simple_strtoull(val_str, &tmp, 0);
-        if (tmp == val_str) {
-                pred->str_val = kstrdup(val_str, GFP_KERNEL);
-                if (!pred->str_val)
-                        return -ENOMEM;
-        } else if (*tmp != '\0')
+static struct filter_pred *create_pred(int op, char *operand1, char *operand2)
+{
+        struct filter_pred *pred;
+
+        pred = kzalloc(sizeof(*pred), GFP_KERNEL);
+        if (!pred)
+                return NULL;
+
+        pred->field_name = kstrdup(operand1, GFP_KERNEL);
+        if (!pred->field_name) {
+                kfree(pred);
+                return NULL;
+        }
+
+        strcpy(pred->str_val, operand2);
+        pred->str_len = strlen(operand2);
+
+        pred->op = op;
+
+        return pred;
+}
+
+static struct filter_pred *create_logical_pred(int op)
+{
+        struct filter_pred *pred;
+
+        pred = kzalloc(sizeof(*pred), GFP_KERNEL);
+        if (!pred)
+                return NULL;
+
+        pred->op = op;
+
+        return pred;
+}
+
+static int check_preds(struct filter_parse_state *ps)
+{
+        int n_normal_preds = 0, n_logical_preds = 0;
+        struct postfix_elt *elt;
+
+        list_for_each_entry(elt, &ps->postfix, list) {
+                if (elt->op == OP_NONE)
+                        continue;
+
+                if (elt->op == OP_AND || elt->op == OP_OR) {
+                        n_logical_preds++;
+                        continue;
+                }
+                n_normal_preds++;
+        }
+
+        if (!n_normal_preds || n_logical_preds >= n_normal_preds) {
+                parse_error(ps, FILT_ERR_INVALID_FILTER, 0);
                 return -EINVAL;
+        }
 
         return 0;
 }
 
+static int replace_preds(struct event_subsystem *system,
+                         struct ftrace_event_call *call,
+                         struct filter_parse_state *ps,
+                         char *filter_string)
+{
+        char *operand1 = NULL, *operand2 = NULL;
+        struct filter_pred *pred;
+        struct postfix_elt *elt;
+        int err;
+
+        err = check_preds(ps);
+        if (err)
+                return err;
+
+        list_for_each_entry(elt, &ps->postfix, list) {
+                if (elt->op == OP_NONE) {
+                        if (!operand1)
+                                operand1 = elt->operand;
+                        else if (!operand2)
+                                operand2 = elt->operand;
+                        else {
+                                parse_error(ps, FILT_ERR_TOO_MANY_OPERANDS, 0);
+                                return -EINVAL;
+                        }
+                        continue;
+                }
+
+                if (elt->op == OP_AND || elt->op == OP_OR) {
+                        pred = create_logical_pred(elt->op);
+                        if (call) {
+                                err = filter_add_pred(ps, call, pred);
+                                filter_free_pred(pred);
+                        } else
+                                err = filter_add_subsystem_pred(ps, system,
+                                                        pred, filter_string);
+                        if (err)
+                                return err;
+
+                        operand1 = operand2 = NULL;
+                        continue;
+                }
+
+                if (!operand1 || !operand2) {
+                        parse_error(ps, FILT_ERR_MISSING_FIELD, 0);
+                        return -EINVAL;
+                }
+
+                pred = create_pred(elt->op, operand1, operand2);
+                if (call) {
+                        err = filter_add_pred(ps, call, pred);
+                        filter_free_pred(pred);
+                } else
+                        err = filter_add_subsystem_pred(ps, system, pred,
+                                                        filter_string);
+                if (err)
+                        return err;
+
+                operand1 = operand2 = NULL;
+        }
+
+        return 0;
+}
+
+int apply_event_filter(struct ftrace_event_call *call, char *filter_string)
+{
+        int err;
+
+        struct filter_parse_state *ps;
+
+        mutex_lock(&event_mutex);
+
+        if (!strcmp(strstrip(filter_string), "0")) {
+                filter_disable_preds(call);
+                remove_filter_string(call->filter);
+                mutex_unlock(&event_mutex);
+                return 0;
+        }
+
+        err = -ENOMEM;
+        ps = kzalloc(sizeof(*ps), GFP_KERNEL);
+        if (!ps)
+                goto out_unlock;
+
+        filter_disable_preds(call);
+        replace_filter_string(call->filter, filter_string);
+
+        parse_init(ps, filter_ops, filter_string);
+        err = filter_parse(ps);
+        if (err) {
+                append_filter_err(ps, call->filter);
+                goto out;
+        }
+
+        err = replace_preds(NULL, call, ps, filter_string);
+        if (err)
+                append_filter_err(ps, call->filter);
+
+out:
+        filter_opstack_clear(ps);
+        postfix_clear(ps);
+        kfree(ps);
+out_unlock:
+        mutex_unlock(&event_mutex);
+
+        return err;
+}
+
+int apply_subsystem_event_filter(struct event_subsystem *system,
+                                 char *filter_string)
+{
+        int err;
+
+        struct filter_parse_state *ps;
+
+        mutex_lock(&event_mutex);
+
+        if (!strcmp(strstrip(filter_string), "0")) {
+                filter_free_subsystem_preds(system);
+                remove_filter_string(system->filter);
+                mutex_unlock(&event_mutex);
+                return 0;
+        }
+
+        err = -ENOMEM;
+        ps = kzalloc(sizeof(*ps), GFP_KERNEL);
+        if (!ps)
+                goto out_unlock;
+
+        filter_free_subsystem_preds(system);
+        replace_filter_string(system->filter, filter_string);
+
+        parse_init(ps, filter_ops, filter_string);
+        err = filter_parse(ps);
+        if (err) {
+                append_filter_err(ps, system->filter);
+                goto out;
+        }
+
+        err = replace_preds(system, NULL, ps, filter_string);
+        if (err)
+                append_filter_err(ps, system->filter);
+
+out:
+        filter_opstack_clear(ps);
+        postfix_clear(ps);
+        kfree(ps);
+out_unlock:
+        mutex_unlock(&event_mutex);
+
+        return err;
+}
 
diff --git a/kernel/trace/trace_events_stage_1.h b/kernel/trace/trace_events_stage_1.h
deleted file mode 100644
index 38985f9b379c..000000000000
--- a/kernel/trace/trace_events_stage_1.h
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- * Stage 1 of the trace events.
- *
- * Override the macros in <trace/trace_event_types.h> to include the following:
- *
- * struct ftrace_raw_<call> {
- *      struct trace_entry              ent;
- *      <type>                          <item>;
- *      <type2>                         <item2>[<len>];
- *      [...]
- * };
- *
- * The <type> <item> is created by the __field(type, item) macro or
- * the __array(type2, item2, len) macro.
- * We simply do "type item;", and that will create the fields
- * in the structure.
- */
-
-#undef TRACE_FORMAT
-#define TRACE_FORMAT(call, proto, args, fmt)
-
-#undef __array
-#define __array(type, item, len)        type    item[len];
-
-#undef __field
-#define __field(type, item)             type    item;
-
-#undef TP_STRUCT__entry
-#define TP_STRUCT__entry(args...) args
-
-#undef TRACE_EVENT
-#define TRACE_EVENT(name, proto, args, tstruct, assign, print)  \
-        struct ftrace_raw_##name {                              \
-                struct trace_entry      ent;                    \
-                tstruct                                         \
-        };                                                      \
-        static struct ftrace_event_call event_##name
-
-#include <trace/trace_event_types.h>
diff --git a/kernel/trace/trace_events_stage_2.h b/kernel/trace/trace_events_stage_2.h
deleted file mode 100644
index d363c6672c6c..000000000000
--- a/kernel/trace/trace_events_stage_2.h
+++ /dev/null
@@ -1,176 +0,0 @@
-/*
- * Stage 2 of the trace events.
- *
- * Override the macros in <trace/trace_event_types.h> to include the following:
- *
- * enum print_line_t
- * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
- * {
- *      struct trace_seq *s = &iter->seq;
- *      struct ftrace_raw_<call> *field; <-- defined in stage 1
- *      struct trace_entry *entry;
- *      int ret;
- *
- *      entry = iter->ent;
- *
- *      if (entry->type != event_<call>.id) {
- *              WARN_ON_ONCE(1);
- *              return TRACE_TYPE_UNHANDLED;
- *      }
- *
- *      field = (typeof(field))entry;
- *
- *      ret = trace_seq_printf(s, <TP_printk> "\n");
- *      if (!ret)
- *              return TRACE_TYPE_PARTIAL_LINE;
- *
- *      return TRACE_TYPE_HANDLED;
- * }
- *
- * This is the method used to print the raw event to the trace
- * output format. Note, this is not needed if the data is read
- * in binary.
- */
-
-#undef __entry
-#define __entry field
-
-#undef TP_printk
-#define TP_printk(fmt, args...) fmt "\n", args
-
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
-enum print_line_t                                                       \
-ftrace_raw_output_##call(struct trace_iterator *iter, int flags)        \
-{                                                                       \
-        struct trace_seq *s = &iter->seq;                               \
-        struct ftrace_raw_##call *field;                                \
-        struct trace_entry *entry;                                      \
-        int ret;                                                        \
-                                                                        \
-        entry = iter->ent;                                              \
-                                                                        \
-        if (entry->type != event_##call.id) {                           \
-                WARN_ON_ONCE(1);                                        \
-                return TRACE_TYPE_UNHANDLED;                            \
-        }                                                               \
-                                                                        \
-        field = (typeof(field))entry;                                   \
-                                                                        \
-        ret = trace_seq_printf(s, #call ": " print);                    \
-        if (!ret)                                                       \
-                return TRACE_TYPE_PARTIAL_LINE;                         \
-                                                                        \
-        return TRACE_TYPE_HANDLED;                                      \
-}
-        
-#include <trace/trace_event_types.h>
-
-/*
- * Setup the showing format of trace point.
- *
- * int
- * ftrace_format_##call(struct trace_seq *s)
- * {
- *      struct ftrace_raw_##call field;
- *      int ret;
- *
- *      ret = trace_seq_printf(s, #type " " #item ";"
- *                             " offset:%u; size:%u;\n",
- *                             offsetof(struct ftrace_raw_##call, item),
- *                             sizeof(field.type));
- *
- * }
- */
-
-#undef TP_STRUCT__entry
-#define TP_STRUCT__entry(args...) args
-
-#undef __field
-#define __field(type, item)                                     \
-        ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"      \
-                               "offset:%u;\tsize:%u;\n",                \
-                               (unsigned int)offsetof(typeof(field), item), \
-                               (unsigned int)sizeof(field.item));       \
-        if (!ret)                                                       \
-                return 0;
-
-#undef __array
-#define __array(type, item, len)                                                \
-        ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t"    \
-                               "offset:%u;\tsize:%u;\n",                \
-                               (unsigned int)offsetof(typeof(field), item), \
-                               (unsigned int)sizeof(field.item));       \
-        if (!ret)                                                       \
-                return 0;
-
-#undef __entry
-#define __entry REC
-
-#undef TP_printk
-#define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
-
-#undef TP_fast_assign
-#define TP_fast_assign(args...) args
-
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
-static int                                                              \
-ftrace_format_##call(struct trace_seq *s)                               \
-{                                                                       \
-        struct ftrace_raw_##call field;                                 \
-        int ret;                                                        \
-                                                                        \
-        tstruct;                                                        \
-                                                                        \
-        trace_seq_printf(s, "\nprint fmt: " print);                     \
-                                                                        \
-        return ret;                                                     \
-}
-
-#include <trace/trace_event_types.h>
-
-#undef __field
-#define __field(type, item)                                             \
-        ret = trace_define_field(event_call, #type, #item,              \
-                                 offsetof(typeof(field), item),         \
-                                 sizeof(field.item));                   \
-        if (ret)                                                        \
-                return ret;
-
-#undef __array
-#define __array(type, item, len)                                        \
-        ret = trace_define_field(event_call, #type "[" #len "]", #item, \
-                                 offsetof(typeof(field), item),         \
-                                 sizeof(field.item));                   \
-        if (ret)                                                        \
-                return ret;
-
-#define __common_field(type, item)                                      \
-        ret = trace_define_field(event_call, #type, "common_" #item,    \
-                                 offsetof(typeof(field.ent), item),     \
-                                 sizeof(field.ent.item));               \
-        if (ret)                                                        \
-                return ret;
-
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
-int                                                                     \
-ftrace_define_fields_##call(void)                                       \
-{                                                                       \
-        struct ftrace_raw_##call field;                                 \
-        struct ftrace_event_call *event_call = &event_##call;           \
-        int ret;                                                        \
-                                                                        \
-        __common_field(unsigned char, type);                            \
-        __common_field(unsigned char, flags);                           \
-        __common_field(unsigned char, preempt_count);                   \
-        __common_field(int, pid);                                       \
-        __common_field(int, tgid);                                      \
-                                                                        \
-        tstruct;                                                        \
-                                                                        \
-        return ret;                                                     \
-}
-
-#include <trace/trace_event_types.h>
diff --git a/kernel/trace/trace_events_stage_3.h b/kernel/trace/trace_events_stage_3.h
deleted file mode 100644
index 9d2fa78cecca..000000000000
--- a/kernel/trace/trace_events_stage_3.h
+++ /dev/null
@@ -1,281 +0,0 @@
-/*
- * Stage 3 of the trace events.
- *
- * Override the macros in <trace/trace_event_types.h> to include the following:
- *
- * static void ftrace_event_<call>(proto)
- * {
- *      event_trace_printk(_RET_IP_, "<call>: " <fmt>);
- * }
- *
- * static int ftrace_reg_event_<call>(void)
- * {
- *      int ret;
- *
- *      ret = register_trace_<call>(ftrace_event_<call>);
- *      if (!ret)
- *              pr_info("event trace: Could not activate trace point "
- *                      "probe to  <call>");
- *      return ret;
- * }
- *
- * static void ftrace_unreg_event_<call>(void)
- * {
- *      unregister_trace_<call>(ftrace_event_<call>);
- * }
- *
- * For those macros defined with TRACE_FORMAT:
- *
- * static struct ftrace_event_call __used
- * __attribute__((__aligned__(4)))
- * __attribute__((section("_ftrace_events"))) event_<call> = {
- *      .name                   = "<call>",
- *      .regfunc                = ftrace_reg_event_<call>,
- *      .unregfunc              = ftrace_unreg_event_<call>,
- * }
- *
- *
- * For those macros defined with TRACE_EVENT:
- *
- * static struct ftrace_event_call event_<call>;
- *
- * static void ftrace_raw_event_<call>(proto)
- * {
- *      struct ring_buffer_event *event;
- *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
- *      unsigned long irq_flags;
- *      int pc;
- *
- *      local_save_flags(irq_flags);
- *      pc = preempt_count();
- *
- *      event = trace_current_buffer_lock_reserve(event_<call>.id,
- *                                sizeof(struct ftrace_raw_<call>),
- *                                irq_flags, pc);
- *      if (!event)
- *              return;
- *      entry   = ring_buffer_event_data(event);
- *
- *      <assign>;  <-- Here we assign the entries by the __field and
- *                      __array macros.
- *
- *      trace_current_buffer_unlock_commit(event, irq_flags, pc);
- * }
- *
- * static int ftrace_raw_reg_event_<call>(void)
- * {
- *      int ret;
- *
- *      ret = register_trace_<call>(ftrace_raw_event_<call>);
- *      if (!ret)
- *              pr_info("event trace: Could not activate trace point "
- *                      "probe to <call>");
- *      return ret;
- * }
- *
- * static void ftrace_unreg_event_<call>(void)
- * {
- *      unregister_trace_<call>(ftrace_raw_event_<call>);
- * }
- *
- * static struct trace_event ftrace_event_type_<call> = {
- *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
- * };
- *
- * static int ftrace_raw_init_event_<call>(void)
- * {
- *      int id;
- *
- *      id = register_ftrace_event(&ftrace_event_type_<call>);
- *      if (!id)
- *              return -ENODEV;
- *      event_<call>.id = id;
- *      return 0;
- * }
- *
- * static struct ftrace_event_call __used
- * __attribute__((__aligned__(4)))
- * __attribute__((section("_ftrace_events"))) event_<call> = {
- *      .name                   = "<call>",
- *      .system                 = "<system>",
- *      .raw_init               = ftrace_raw_init_event_<call>,
- *      .regfunc                = ftrace_reg_event_<call>,
- *      .unregfunc              = ftrace_unreg_event_<call>,
- *      .show_format            = ftrace_format_<call>,
- * }
- *
- */
-
-#undef TP_FMT
-#define TP_FMT(fmt, args...)    fmt "\n", ##args
-
-#ifdef CONFIG_EVENT_PROFILE
-#define _TRACE_PROFILE(call, proto, args)                               \
-static void ftrace_profile_##call(proto)                                \
-{                                                                       \
-        extern void perf_tpcounter_event(int);                          \
-        perf_tpcounter_event(event_##call.id);                          \
-}                                                                       \
-                                                                        \
-static int ftrace_profile_enable_##call(struct ftrace_event_call *call) \
-{                                                                       \
-        int ret = 0;                                                    \
-                                                                        \
-        if (!atomic_inc_return(&call->profile_count))                   \
-                ret = register_trace_##call(ftrace_profile_##call);     \
-                                                                        \
-        return ret;                                                     \
-}                                                                       \
-                                                                        \
-static void ftrace_profile_disable_##call(struct ftrace_event_call *call) \
-{                                                                       \
-        if (atomic_add_negative(-1, &call->profile_count))              \
-                unregister_trace_##call(ftrace_profile_##call);         \
-}
-
-#define _TRACE_PROFILE_INIT(call)                                       \
-        .profile_count = ATOMIC_INIT(-1),                               \
-        .profile_enable = ftrace_profile_enable_##call,                 \
-        .profile_disable = ftrace_profile_disable_##call,
-
-#else
-#define _TRACE_PROFILE(call, proto, args)
-#define _TRACE_PROFILE_INIT(call)
-#endif
-
-#define _TRACE_FORMAT(call, proto, args, fmt)                           \
-static void ftrace_event_##call(proto)                                  \
-{                                                                       \
-        event_trace_printk(_RET_IP_, #call ": " fmt);                   \
-}                                                                       \
-                                                                        \
-static int ftrace_reg_event_##call(void)                                \
-{                                                                       \
-        int ret;                                                        \
-                                                                        \
-        ret = register_trace_##call(ftrace_event_##call);               \
-        if (ret)                                                        \
-                pr_info("event trace: Could not activate trace point "  \
-                        "probe to " #call "\n");                        \
-        return ret;                                                     \
-}                                                                       \
-                                                                        \
-static void ftrace_unreg_event_##call(void)                             \
-{                                                                       \
-        unregister_trace_##call(ftrace_event_##call);                   \
-}                                                                       \
-                                                                        \
-static struct ftrace_event_call event_##call;                           \
-                                                                        \
-static int ftrace_init_event_##call(void)                               \
-{                                                                       \
-        int id;                                                         \
-                                                                        \
-        id = register_ftrace_event(NULL);                               \
-        if (!id)                                                        \
-                return -ENODEV;                                         \
-        event_##call.id = id;                                           \
-        return 0;                                                       \
-}
-
-#undef TRACE_FORMAT
-#define TRACE_FORMAT(call, proto, args, fmt)                            \
-_TRACE_FORMAT(call, PARAMS(proto), PARAMS(args), PARAMS(fmt))           \
-_TRACE_PROFILE(call, PARAMS(proto), PARAMS(args))                       \
-static struct ftrace_event_call __used                                  \
-__attribute__((__aligned__(4)))                                         \
-__attribute__((section("_ftrace_events"))) event_##call = {             \
-        .name                   = #call,                                \
-        .system                 = __stringify(TRACE_SYSTEM),            \
-        .raw_init               = ftrace_init_event_##call,             \
-        .regfunc                = ftrace_reg_event_##call,              \
-        .unregfunc              = ftrace_unreg_event_##call,            \
-        _TRACE_PROFILE_INIT(call)                                       \
-}
-
-#undef __entry
-#define __entry entry
-
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
-_TRACE_PROFILE(call, PARAMS(proto), PARAMS(args))                       \
-                                                                        \
-static struct ftrace_event_call event_##call;                           \
-                                                                        \
-static void ftrace_raw_event_##call(proto)                              \
-{                                                                       \
-        struct ftrace_event_call *call = &event_##call;                 \
-        struct ring_buffer_event *event;                                \
-        struct ftrace_raw_##call *entry;                                \
-        unsigned long irq_flags;                                        \
-        int pc;                                                         \
-                                                                        \
-        local_save_flags(irq_flags);                                    \
-        pc = preempt_count();                                           \
-                                                                        \
-        event = trace_current_buffer_lock_reserve(event_##call.id,      \
-                                  sizeof(struct ftrace_raw_##call),     \
-                                  irq_flags, pc);                       \
-        if (!event)                                                     \
-                return;                                                 \
-        entry   = ring_buffer_event_data(event);                        \
-                                                                        \
-        assign;                                                         \
-                                                                        \
-        if (call->preds && !filter_match_preds(call, entry))            \
-                ring_buffer_event_discard(event);                       \
-                                                                        \
-        trace_nowake_buffer_unlock_commit(event, irq_flags, pc);        \
-                                                                        \
-}                                                                       \
-                                                                        \
-static int ftrace_raw_reg_event_##call(void)                            \
-{                                                                       \
-        int ret;                                                        \
-                                                                        \
-        ret = register_trace_##call(ftrace_raw_event_##call);           \
-        if (ret)                                                        \
-                pr_info("event trace: Could not activate trace point "  \
-                        "probe to " #call "\n");                        \
-        return ret;                                                     \
-}                                                                       \
-                                                                        \
-static void ftrace_raw_unreg_event_##call(void)                         \
-{                                                                       \
-        unregister_trace_##call(ftrace_raw_event_##call);               \
-}                                                                       \
-                                                                        \
-static struct trace_event ftrace_event_type_##call = {                  \
-        .trace                  = ftrace_raw_output_##call,             \
-};                                                                      \
-                                                                        \
-static int ftrace_raw_init_event_##call(void)                           \
-{                                                                       \
-        int id;                                                         \
-                                                                        \
-        id = register_ftrace_event(&ftrace_event_type_##call);          \
-        if (!id)                                                        \
-                return -ENODEV;                                         \
-        event_##call.id = id;                                           \
-        INIT_LIST_HEAD(&event_##call.fields);                           \
-        return 0;                                                       \
-}                                                                       \
-                                                                        \
-static struct ftrace_event_call __used                                  \
-__attribute__((__aligned__(4)))                                         \
-__attribute__((section("_ftrace_events"))) event_##call = {             \
-        .name                   = #call,                                \
-        .system                 = __stringify(TRACE_SYSTEM),            \
-        .raw_init               = ftrace_raw_init_event_##call,         \
-        .regfunc                = ftrace_raw_reg_event_##call,          \
-        .unregfunc              = ftrace_raw_unreg_event_##call,        \
-        .show_format            = ftrace_format_##call,                 \
-        .define_fields          = ftrace_define_fields_##call,          \
-        _TRACE_PROFILE_INIT(call)                                       \
-}
-
-#include <trace/trace_event_types.h>
-
-#undef _TRACE_PROFILE
-#undef _TRACE_PROFILE_INIT
-
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 07a22c33ebf3..d06cf898dc86 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -19,8 +19,12 @@
 #undef TRACE_STRUCT
 #define TRACE_STRUCT(args...) args
 
+extern void __bad_type_size(void);
+
 #undef TRACE_FIELD
 #define TRACE_FIELD(type, item, assign)                                 \
+        if (sizeof(type) != sizeof(field.item))                         \
+                __bad_type_size();                                      \
         ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"      \
                                "offset:%u;\tsize:%u;\n",                \
                                (unsigned int)offsetof(typeof(field), item), \
@@ -30,7 +34,7 @@
 
 
 #undef TRACE_FIELD_SPECIAL
-#define TRACE_FIELD_SPECIAL(type_item, item, cmd)                       \
+#define TRACE_FIELD_SPECIAL(type_item, item, len, cmd)                  \
         ret = trace_seq_printf(s, "\tfield special:" #type_item ";\t"   \
                                "offset:%u;\tsize:%u;\n",                \
                                (unsigned int)offsetof(typeof(field), item), \
@@ -46,6 +50,9 @@
         if (!ret)                                                       \
                 return 0;
 
+#undef TRACE_FIELD_SIGN
+#define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
+        TRACE_FIELD(type, item, assign)
 
 #undef TP_RAW_FMT
 #define TP_RAW_FMT(args...) args
@@ -65,6 +72,22 @@ ftrace_format_##call(struct trace_seq *s)				\
         return ret;                                                     \
 }
 
+#undef TRACE_EVENT_FORMAT_NOFILTER
+#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
+                                    tpfmt)                              \
+static int                                                              \
+ftrace_format_##call(struct trace_seq *s)                               \
+{                                                                       \
+        struct args field;                                              \
+        int ret;                                                        \
+                                                                        \
+        tstruct;                                                        \
+                                                                        \
+        trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt);            \
+                                                                        \
+        return ret;                                                     \
+}
+
 #include "trace_event_types.h"
 
 #undef TRACE_ZERO_CHAR
@@ -78,6 +101,10 @@ ftrace_format_##call(struct trace_seq *s)				\
 #define TRACE_FIELD(type, item, assign)\
         entry->item = assign;
 
+#undef TRACE_FIELD_SIGN
+#define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
+        TRACE_FIELD(type, item, assign)
+
 #undef TP_CMD
 #define TP_CMD(cmd...)  cmd
 
@@ -85,18 +112,95 @@ ftrace_format_##call(struct trace_seq *s)				\
 #define TRACE_ENTRY     entry
 
 #undef TRACE_FIELD_SPECIAL
-#define TRACE_FIELD_SPECIAL(type_item, item, cmd) \
+#define TRACE_FIELD_SPECIAL(type_item, item, len, cmd)  \
         cmd;
 
 #undef TRACE_EVENT_FORMAT
 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
+int ftrace_define_fields_##call(void);                                  \
+static int ftrace_raw_init_event_##call(void);                          \
+                                                                        \
+struct ftrace_event_call __used                                         \
+__attribute__((__aligned__(4)))                                         \
+__attribute__((section("_ftrace_events"))) event_##call = {             \
+        .name                   = #call,                                \
+        .id                     = proto,                                \
+        .system                 = __stringify(TRACE_SYSTEM),            \
+        .raw_init               = ftrace_raw_init_event_##call,         \
+        .show_format            = ftrace_format_##call,                 \
+        .define_fields          = ftrace_define_fields_##call,          \
+};                                                                      \
+static int ftrace_raw_init_event_##call(void)                           \
+{                                                                       \
+        INIT_LIST_HEAD(&event_##call.fields);                           \
+        init_preds(&event_##call);                                      \
+        return 0;                                                       \
+}                                                                       \
+
+#undef TRACE_EVENT_FORMAT_NOFILTER
+#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
+                                    tpfmt)                              \
                                                                         \
-static struct ftrace_event_call __used                                  \
+struct ftrace_event_call __used                                         \
 __attribute__((__aligned__(4)))                                         \
 __attribute__((section("_ftrace_events"))) event_##call = {             \
         .name                   = #call,                                \
         .id                     = proto,                                \
         .system                 = __stringify(TRACE_SYSTEM),            \
         .show_format            = ftrace_format_##call,                 \
+};
+
+#include "trace_event_types.h"
+
+#undef TRACE_FIELD
+#define TRACE_FIELD(type, item, assign)                                 \
+        ret = trace_define_field(event_call, #type, #item,              \
+                                 offsetof(typeof(field), item),         \
+                                 sizeof(field.item), is_signed_type(type));     \
+        if (ret)                                                        \
+                return ret;
+
+#undef TRACE_FIELD_SPECIAL
+#define TRACE_FIELD_SPECIAL(type, item, len, cmd)                       \
+        ret = trace_define_field(event_call, #type "[" #len "]", #item, \
+                                 offsetof(typeof(field), item),         \
+                                 sizeof(field.item), 0);                \
+        if (ret)                                                        \
+                return ret;
+
+#undef TRACE_FIELD_SIGN
+#define TRACE_FIELD_SIGN(type, item, assign, is_signed)                 \
+        ret = trace_define_field(event_call, #type, #item,              \
+                                 offsetof(typeof(field), item),         \
+                                 sizeof(field.item), is_signed);        \
+        if (ret)                                                        \
+                return ret;
+
+#undef TRACE_FIELD_ZERO_CHAR
+#define TRACE_FIELD_ZERO_CHAR(item)
+
+#undef TRACE_EVENT_FORMAT
+#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
+int                                                                     \
+ftrace_define_fields_##call(void)                                       \
+{                                                                       \
+        struct ftrace_event_call *event_call = &event_##call;           \
+        struct args field;                                              \
+        int ret;                                                        \
+                                                                        \
+        __common_field(unsigned char, type, 0);                         \
+        __common_field(unsigned char, flags, 0);                        \
+        __common_field(unsigned char, preempt_count, 0);                \
+        __common_field(int, pid, 1);                                    \
+        __common_field(int, tgid, 1);                                   \
+                                                                        \
+        tstruct;                                                        \
+                                                                        \
+        return ret;                                                     \
 }
+
+#undef TRACE_EVENT_FORMAT_NOFILTER
+#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct,    \
+                                    tpfmt)
+
 #include "trace_event_types.h"
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index c9a0b7df44ff..90f134764837 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -193,9 +193,11 @@ static void tracing_start_function_trace(void)
 static void tracing_stop_function_trace(void)
 {
         ftrace_function_enabled = 0;
-        /* OK if they are not registered */
-        unregister_ftrace_function(&trace_stack_ops);
-        unregister_ftrace_function(&trace_ops);
+
+        if (func_flags.val & TRACE_FUNC_OPT_STACK)
+                unregister_ftrace_function(&trace_stack_ops);
+        else
+                unregister_ftrace_function(&trace_ops);
 }
 
 static int func_set_flag(u32 old_flags, u32 bit, int set)
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index d28687e7b3a7..d2249abafb53 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -57,7 +57,8 @@ static struct tracer_flags tracer_flags = {
 
 /* Add a function return address to the trace stack on thread info.*/
 int
-ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth)
+ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
+                         unsigned long frame_pointer)
 {
         unsigned long long calltime;
         int index;
@@ -65,6 +66,12 @@ ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth)
         if (!current->ret_stack)
                 return -EBUSY;
 
+        /*
+         * We must make sure the ret_stack is tested before we read
+         * anything else.
+         */
+        smp_rmb();
+
         /* The return trace stack is full */
         if (current->curr_ret_stack == FTRACE_RETFUNC_DEPTH - 1) {
                 atomic_inc(&current->trace_overrun);
@@ -78,14 +85,17 @@ ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth)
         current->ret_stack[index].ret = ret;
         current->ret_stack[index].func = func;
         current->ret_stack[index].calltime = calltime;
+        current->ret_stack[index].subtime = 0;
+        current->ret_stack[index].fp = frame_pointer;
         *depth = index;
 
         return 0;
 }
 
 /* Retrieve a function return address to the trace stack on thread info.*/
-void
-ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret)
+static void
+ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret,
+                        unsigned long frame_pointer)
 {
         int index;
 
@@ -99,28 +109,52 @@ ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret)
                 return;
         }
 
+#ifdef CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST
+        /*
+         * The arch may choose to record the frame pointer used
+         * and check it here to make sure that it is what we expect it
+         * to be. If gcc does not set the place holder of the return
+         * address in the frame pointer, and does a copy instead, then
+         * the function graph trace will fail. This test detects this
+         * case.
+         *
+         * Currently, x86_32 with optimize for size (-Os) makes the latest
+         * gcc do the above.
+         */
+        if (unlikely(current->ret_stack[index].fp != frame_pointer)) {
+                ftrace_graph_stop();
+                WARN(1, "Bad frame pointer: expected %lx, received %lx\n"
+                     "  from func %pF return to %lx\n",
+                     current->ret_stack[index].fp,
+                     frame_pointer,
+                     (void *)current->ret_stack[index].func,
+                     current->ret_stack[index].ret);
+                *ret = (unsigned long)panic;
+                return;
+        }
+#endif
+
         *ret = current->ret_stack[index].ret;
         trace->func = current->ret_stack[index].func;
         trace->calltime = current->ret_stack[index].calltime;
         trace->overrun = atomic_read(&current->trace_overrun);
         trace->depth = index;
-        barrier();
-        current->curr_ret_stack--;
-
 }
 
 /*
  * Send the trace to the ring-buffer.
  * @return the original return address.
  */
-unsigned long ftrace_return_to_handler(void)
+unsigned long ftrace_return_to_handler(unsigned long frame_pointer)
 {
         struct ftrace_graph_ret trace;
         unsigned long ret;
 
-        ftrace_pop_return_trace(&trace, &ret);
+        ftrace_pop_return_trace(&trace, &ret, frame_pointer);
         trace.rettime = trace_clock_local();
         ftrace_graph_return(&trace);
+        barrier();
+        current->curr_ret_stack--;
 
         if (unlikely(!ret)) {
                 ftrace_graph_stop();
@@ -426,8 +460,8 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
         return TRACE_TYPE_HANDLED;
 }
 
-static enum print_line_t
-print_graph_duration(unsigned long long duration, struct trace_seq *s)
+enum print_line_t
+trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
 {
         unsigned long nsecs_rem = do_div(duration, 1000);
         /* log10(ULONG_MAX) + '\0' */
@@ -464,12 +498,23 @@ print_graph_duration(unsigned long long duration, struct trace_seq *s)
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
         }
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+print_graph_duration(unsigned long long duration, struct trace_seq *s)
+{
+        int ret;
+
+        ret = trace_print_graph_duration(duration, s);
+        if (ret != TRACE_TYPE_HANDLED)
+                return ret;
 
         ret = trace_seq_printf(s, "|  ");
         if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
-        return TRACE_TYPE_HANDLED;
 
+        return TRACE_TYPE_HANDLED;
 }
 
 /* Case of a leaf function on its call entry */
diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c
index 7bfdf4c2347f..ca7d7c4d0c2a 100644
--- a/kernel/trace/trace_hw_branches.c
+++ b/kernel/trace/trace_hw_branches.c
@@ -1,10 +1,9 @@
 /*
- * h/w branch tracer for x86 based on bts
+ * h/w branch tracer for x86 based on BTS
  *
  * Copyright (C) 2008-2009 Intel Corporation.
  * Markus Metzger <markus.t.metzger@gmail.com>, 2008-2009
  */
-#include <linux/spinlock.h>
 #include <linux/kallsyms.h>
 #include <linux/debugfs.h>
 #include <linux/ftrace.h>
@@ -15,110 +14,119 @@
 
 #include <asm/ds.h>
 
-#include "trace.h"
 #include "trace_output.h"
+#include "trace.h"
 
 
-#define SIZEOF_BTS (1 << 13)
+#define BTS_BUFFER_SIZE (1 << 13)
 
-/*
- * The tracer lock protects the below per-cpu tracer array.
- * It needs to be held to:
- * - start tracing on all cpus
- * - stop tracing on all cpus
- * - start tracing on a single hotplug cpu
- * - stop tracing on a single hotplug cpu
- * - read the trace from all cpus
- * - read the trace from a single cpu
- */
-static DEFINE_SPINLOCK(bts_tracer_lock);
 static DEFINE_PER_CPU(struct bts_tracer *, tracer);
-static DEFINE_PER_CPU(unsigned char[SIZEOF_BTS], buffer);
+static DEFINE_PER_CPU(unsigned char[BTS_BUFFER_SIZE], buffer);
 
 #define this_tracer per_cpu(tracer, smp_processor_id())
-#define this_buffer per_cpu(buffer, smp_processor_id())
 
-static int __read_mostly trace_hw_branches_enabled;
+static int trace_hw_branches_enabled __read_mostly;
+static int trace_hw_branches_suspended __read_mostly;
 static struct trace_array *hw_branch_trace __read_mostly;
 
 
-/*
- * Start tracing on the current cpu.
- * The argument is ignored.
- *
- * pre: bts_tracer_lock must be locked.
- */
-static void bts_trace_start_cpu(void *arg)
+static void bts_trace_init_cpu(int cpu)
 {
-        if (this_tracer)
-                ds_release_bts(this_tracer);
-
-        this_tracer =
-                ds_request_bts(/* task = */ NULL, this_buffer, SIZEOF_BTS,
-                               /* ovfl = */ NULL, /* th = */ (size_t)-1,
-                               BTS_KERNEL);
-        if (IS_ERR(this_tracer)) {
-                this_tracer = NULL;
-                return;
-        }
+        per_cpu(tracer, cpu) =
+                ds_request_bts_cpu(cpu, per_cpu(buffer, cpu), BTS_BUFFER_SIZE,
+                                   NULL, (size_t)-1, BTS_KERNEL);
+
+        if (IS_ERR(per_cpu(tracer, cpu)))
+                per_cpu(tracer, cpu) = NULL;
 }
 
-static void bts_trace_start(struct trace_array *tr)
+static int bts_trace_init(struct trace_array *tr)
 {
-        spin_lock(&bts_tracer_lock);
+        int cpu;
+
+        hw_branch_trace = tr;
+        trace_hw_branches_enabled = 0;
 
-        on_each_cpu(bts_trace_start_cpu, NULL, 1);
-        trace_hw_branches_enabled = 1;
+        get_online_cpus();
+        for_each_online_cpu(cpu) {
+                bts_trace_init_cpu(cpu);
 
-        spin_unlock(&bts_tracer_lock);
+                if (likely(per_cpu(tracer, cpu)))
+                        trace_hw_branches_enabled = 1;
+        }
+        trace_hw_branches_suspended = 0;
+        put_online_cpus();
+
+        /* If we could not enable tracing on a single cpu, we fail. */
+        return trace_hw_branches_enabled ? 0 : -EOPNOTSUPP;
 }
 
-/*
- * Stop tracing on the current cpu.
- * The argument is ignored.
- *
- * pre: bts_tracer_lock must be locked.
- */
-static void bts_trace_stop_cpu(void *arg)
+static void bts_trace_reset(struct trace_array *tr)
 {
-        if (this_tracer) {
-                ds_release_bts(this_tracer);
-                this_tracer = NULL;
+        int cpu;
+
+        get_online_cpus();
+        for_each_online_cpu(cpu) {
+                if (likely(per_cpu(tracer, cpu))) {
+                        ds_release_bts(per_cpu(tracer, cpu));
+                        per_cpu(tracer, cpu) = NULL;
+                }
         }
+        trace_hw_branches_enabled = 0;
+        trace_hw_branches_suspended = 0;
+        put_online_cpus();
 }
 
-static void bts_trace_stop(struct trace_array *tr)
+static void bts_trace_start(struct trace_array *tr)
 {
-        spin_lock(&bts_tracer_lock);
+        int cpu;
 
-        trace_hw_branches_enabled = 0;
-        on_each_cpu(bts_trace_stop_cpu, NULL, 1);
+        get_online_cpus();
+        for_each_online_cpu(cpu)
+                if (likely(per_cpu(tracer, cpu)))
+                        ds_resume_bts(per_cpu(tracer, cpu));
+        trace_hw_branches_suspended = 0;
+        put_online_cpus();
+}
 
-        spin_unlock(&bts_tracer_lock);
+static void bts_trace_stop(struct trace_array *tr)
+{
+        int cpu;
+
+        get_online_cpus();
+        for_each_online_cpu(cpu)
+                if (likely(per_cpu(tracer, cpu)))
+                        ds_suspend_bts(per_cpu(tracer, cpu));
+        trace_hw_branches_suspended = 1;
+        put_online_cpus();
 }
 
 static int __cpuinit bts_hotcpu_handler(struct notifier_block *nfb,
                                      unsigned long action, void *hcpu)
 {
-        unsigned int cpu = (unsigned long)hcpu;
-
-        spin_lock(&bts_tracer_lock);
-
-        if (!trace_hw_branches_enabled)
-                goto out;
+        int cpu = (long)hcpu;
 
         switch (action) {
         case CPU_ONLINE:
         case CPU_DOWN_FAILED:
-                smp_call_function_single(cpu, bts_trace_start_cpu, NULL, 1);
+                /* The notification is sent with interrupts enabled. */
+                if (trace_hw_branches_enabled) {
+                        bts_trace_init_cpu(cpu);
+
+                        if (trace_hw_branches_suspended &&
+                            likely(per_cpu(tracer, cpu)))
+                                ds_suspend_bts(per_cpu(tracer, cpu));
+                }
                 break;
+
         case CPU_DOWN_PREPARE:
-                smp_call_function_single(cpu, bts_trace_stop_cpu, NULL, 1);
-                break;
+                /* The notification is sent with interrupts enabled. */
+                if (likely(per_cpu(tracer, cpu))) {
+                        ds_release_bts(per_cpu(tracer, cpu));
+                        per_cpu(tracer, cpu) = NULL;
+                }
         }
 
- out:
-        spin_unlock(&bts_tracer_lock);
         return NOTIFY_DONE;
 }
 
@@ -126,20 +134,6 @@ static struct notifier_block bts_hotcpu_notifier __cpuinitdata = {
         .notifier_call = bts_hotcpu_handler
 };
 
-static int bts_trace_init(struct trace_array *tr)
-{
-        hw_branch_trace = tr;
-
-        bts_trace_start(tr);
-
-        return 0;
-}
-
-static void bts_trace_reset(struct trace_array *tr)
-{
-        bts_trace_stop(tr);
-}
-
 static void bts_trace_print_header(struct seq_file *m)
 {
         seq_puts(m, "# CPU#        TO  <-  FROM\n");
@@ -147,10 +141,10 @@ static void bts_trace_print_header(struct seq_file *m)
 
 static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
 {
+        unsigned long symflags = TRACE_ITER_SYM_OFFSET;
         struct trace_entry *entry = iter->ent;
         struct trace_seq *seq = &iter->seq;
         struct hw_branch_entry *it;
-        unsigned long symflags = TRACE_ITER_SYM_OFFSET;
 
         trace_assign_type(it, entry);
 
@@ -168,6 +162,7 @@ static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
 
 void trace_hw_branch(u64 from, u64 to)
 {
+        struct ftrace_event_call *call = &event_hw_branch;
         struct trace_array *tr = hw_branch_trace;
         struct ring_buffer_event *event;
         struct hw_branch_entry *entry;
@@ -194,7 +189,8 @@ void trace_hw_branch(u64 from, u64 to)
         entry->ent.type = TRACE_HW_BRANCHES;
         entry->from = from;
         entry->to   = to;
-        trace_buffer_unlock_commit(tr, event, 0, 0);
+        if (!filter_check_discard(call, entry, tr->buffer, event))
+                trace_buffer_unlock_commit(tr, event, 0, 0);
 
  out:
         atomic_dec(&tr->data[cpu]->disabled);
@@ -224,11 +220,11 @@ static void trace_bts_at(const struct bts_trace *trace, void *at)
 /*
  * Collect the trace on the current cpu and write it into the ftrace buffer.
  *
- * pre: bts_tracer_lock must be locked
+ * pre: tracing must be suspended on the current cpu
  */
 static void trace_bts_cpu(void *arg)
 {
-        struct trace_array *tr = (struct trace_array *) arg;
+        struct trace_array *tr = (struct trace_array *)arg;
         const struct bts_trace *trace;
         unsigned char *at;
 
@@ -241,10 +237,9 @@ static void trace_bts_cpu(void *arg)
         if (unlikely(!this_tracer))
                 return;
 
-        ds_suspend_bts(this_tracer);
         trace = ds_read_bts(this_tracer);
         if (!trace)
-                goto out;
+                return;
 
         for (at = trace->ds.top; (void *)at < trace->ds.end;
              at += trace->ds.size)
@@ -253,18 +248,27 @@ static void trace_bts_cpu(void *arg)
         for (at = trace->ds.begin; (void *)at < trace->ds.top;
              at += trace->ds.size)
                 trace_bts_at(trace, at);
-
-out:
-        ds_resume_bts(this_tracer);
 }
 
 static void trace_bts_prepare(struct trace_iterator *iter)
 {
-        spin_lock(&bts_tracer_lock);
+        int cpu;
 
+        get_online_cpus();
+        for_each_online_cpu(cpu)
+                if (likely(per_cpu(tracer, cpu)))
+                        ds_suspend_bts(per_cpu(tracer, cpu));
+        /*
+         * We need to collect the trace on the respective cpu since ftrace
+         * implicitly adds the record for the current cpu.
+         * Once that is more flexible, we could collect the data from any cpu.
+         */
         on_each_cpu(trace_bts_cpu, iter->tr, 1);
 
-        spin_unlock(&bts_tracer_lock);
+        for_each_online_cpu(cpu)
+                if (likely(per_cpu(tracer, cpu)))
+                        ds_resume_bts(per_cpu(tracer, cpu));
+        put_online_cpus();
 }
 
 static void trace_bts_close(struct trace_iterator *iter)
@@ -274,11 +278,11 @@ static void trace_bts_close(struct trace_iterator *iter)
 
 void trace_hw_branch_oops(void)
 {
-        spin_lock(&bts_tracer_lock);
-
-        trace_bts_cpu(hw_branch_trace);
-
-        spin_unlock(&bts_tracer_lock);
+        if (this_tracer) {
+                ds_suspend_bts_noirq(this_tracer);
+                trace_bts_cpu(hw_branch_trace);
+                ds_resume_bts_noirq(this_tracer);
+        }
 }
 
 struct tracer bts_tracer __read_mostly =
@@ -291,7 +295,10 @@ struct tracer bts_tracer __read_mostly =
         .start          = bts_trace_start,
         .stop           = bts_trace_stop,
         .open           = trace_bts_prepare,
-        .close          = trace_bts_close
+        .close          = trace_bts_close,
+#ifdef CONFIG_FTRACE_SELFTEST
+        .selftest       = trace_selftest_startup_hw_branches,
+#endif /* CONFIG_FTRACE_SELFTEST */
 };
 
 __init static int init_bts_trace(void)
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index 8e37fcddd8b4..d53b45ed0806 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -9,6 +9,8 @@
 #include <linux/kernel.h>
 #include <linux/mmiotrace.h>
 #include <linux/pci.h>
+#include <linux/time.h>
+
 #include <asm/atomic.h>
 
 #include "trace.h"
@@ -174,7 +176,7 @@ static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
         struct mmiotrace_rw *rw;
         struct trace_seq *s     = &iter->seq;
         unsigned long long t    = ns2usecs(iter->ts);
-        unsigned long usec_rem  = do_div(t, 1000000ULL);
+        unsigned long usec_rem  = do_div(t, USEC_PER_SEC);
         unsigned secs           = (unsigned long)t;
         int ret = 1;
 
@@ -221,7 +223,7 @@ static enum print_line_t mmio_print_map(struct trace_iterator *iter)
         struct mmiotrace_map *m;
         struct trace_seq *s     = &iter->seq;
         unsigned long long t    = ns2usecs(iter->ts);
-        unsigned long usec_rem  = do_div(t, 1000000ULL);
+        unsigned long usec_rem  = do_div(t, USEC_PER_SEC);
         unsigned secs           = (unsigned long)t;
         int ret;
 
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 64b54a59c55b..7938f3ae93e3 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -14,11 +14,25 @@
 /* must be a power of 2 */
 #define EVENT_HASHSIZE  128
 
-static DEFINE_MUTEX(trace_event_mutex);
+DECLARE_RWSEM(trace_event_mutex);
+
+DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
+EXPORT_PER_CPU_SYMBOL(ftrace_event_seq);
+
 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
 
 static int next_event_type = __TRACE_LAST_TYPE + 1;
 
+void trace_print_seq(struct seq_file *m, struct trace_seq *s)
+{
+        int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
+
+        s->buffer[len] = 0;
+        seq_puts(m, s->buffer);
+
+        trace_seq_init(s);
+}
+
 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
 {
         struct trace_seq *s = &iter->seq;
@@ -84,6 +98,39 @@ trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
 
         return len;
 }
+EXPORT_SYMBOL_GPL(trace_seq_printf);
+
+/**
+ * trace_seq_vprintf - sequence printing of trace information
+ * @s: trace sequence descriptor
+ * @fmt: printf format string
+ *
+ * The tracer may use either sequence operations or its own
+ * copy to user routines. To simplify formating of a trace
+ * trace_seq_printf is used to store strings into a special
+ * buffer (@s). Then the output may be either used by
+ * the sequencer or pulled into another buffer.
+ */
+int
+trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
+{
+        int len = (PAGE_SIZE - 1) - s->len;
+        int ret;
+
+        if (!len)
+                return 0;
+
+        ret = vsnprintf(s->buffer + s->len, len, fmt, args);
+
+        /* If we can't write it all, don't bother writing anything */
+        if (ret >= len)
+                return 0;
+
+        s->len += ret;
+
+        return len;
+}
+EXPORT_SYMBOL_GPL(trace_seq_vprintf);
 
 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
 {
@@ -201,6 +248,67 @@ int trace_seq_path(struct trace_seq *s, struct path *path)
         return 0;
 }
 
+const char *
+ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
+                       unsigned long flags,
+                       const struct trace_print_flags *flag_array)
+{
+        unsigned long mask;
+        const char *str;
+        const char *ret = p->buffer + p->len;
+        int i;
+
+        for (i = 0;  flag_array[i].name && flags; i++) {
+
+                mask = flag_array[i].mask;
+                if ((flags & mask) != mask)
+                        continue;
+
+                str = flag_array[i].name;
+                flags &= ~mask;
+                if (p->len && delim)
+                        trace_seq_puts(p, delim);
+                trace_seq_puts(p, str);
+        }
+
+        /* check for left over flags */
+        if (flags) {
+                if (p->len && delim)
+                        trace_seq_puts(p, delim);
+                trace_seq_printf(p, "0x%lx", flags);
+        }
+
+        trace_seq_putc(p, 0);
+
+        return ret;
+}
+EXPORT_SYMBOL(ftrace_print_flags_seq);
+
+const char *
+ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
+                         const struct trace_print_flags *symbol_array)
+{
+        int i;
+        const char *ret = p->buffer + p->len;
+
+        for (i = 0;  symbol_array[i].name; i++) {
+
+                if (val != symbol_array[i].mask)
+                        continue;
+
+                trace_seq_puts(p, symbol_array[i].name);
+                break;
+        }
+
+        if (!p->len)
+                trace_seq_printf(p, "0x%lx", val);
+                
+        trace_seq_putc(p, 0);
+
+        return ret;
+}
+EXPORT_SYMBOL(ftrace_print_symbols_seq);
+
 #ifdef CONFIG_KRETPROBES
 static inline const char *kretprobed(const char *name)
 {
@@ -311,17 +419,20 @@ seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 
                 if (ip == ULONG_MAX || !ret)
                         break;
-                if (i && ret)
-                        ret = trace_seq_puts(s, " <- ");
+                if (ret)
+                        ret = trace_seq_puts(s, " => ");
                 if (!ip) {
                         if (ret)
                                 ret = trace_seq_puts(s, "??");
+                        if (ret)
+                                ret = trace_seq_puts(s, "\n");
                         continue;
                 }
                 if (!ret)
                         break;
                 if (ret)
                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
+                ret = trace_seq_puts(s, "\n");
         }
 
         if (mm)
@@ -455,6 +566,7 @@ static int task_state_char(unsigned long state)
  * @type: the type of event to look for
  *
  * Returns an event of type @type otherwise NULL
+ * Called with trace_event_read_lock() held.
  */
 struct trace_event *ftrace_find_event(int type)
 {
@@ -464,7 +576,7 @@ struct trace_event *ftrace_find_event(int type)
 
         key = type & (EVENT_HASHSIZE - 1);
 
-        hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
+        hlist_for_each_entry(event, n, &event_hash[key], node) {
                 if (event->type == type)
                         return event;
         }
@@ -472,6 +584,46 @@ struct trace_event *ftrace_find_event(int type)
         return NULL;
 }
 
+static LIST_HEAD(ftrace_event_list);
+
+static int trace_search_list(struct list_head **list)
+{
+        struct trace_event *e;
+        int last = __TRACE_LAST_TYPE;
+
+        if (list_empty(&ftrace_event_list)) {
+                *list = &ftrace_event_list;
+                return last + 1;
+        }
+
+        /*
+         * We used up all possible max events,
+         * lets see if somebody freed one.
+         */
+        list_for_each_entry(e, &ftrace_event_list, list) {
+                if (e->type != last + 1)
+                        break;
+                last++;
+        }
+
+        /* Did we used up all 65 thousand events??? */
+        if ((last + 1) > FTRACE_MAX_EVENT)
+                return 0;
+
+        *list = &e->list;
+        return last + 1;
+}
+
+void trace_event_read_lock(void)
+{
+        down_read(&trace_event_mutex);
+}
+
+void trace_event_read_unlock(void)
+{
+        up_read(&trace_event_mutex);
+}
+
 /**
  * register_ftrace_event - register output for an event type
  * @event: the event type to register
@@ -492,22 +644,42 @@ int register_ftrace_event(struct trace_event *event)
         unsigned key;
         int ret = 0;
 
-        mutex_lock(&trace_event_mutex);
+        down_write(&trace_event_mutex);
 
-        if (!event) {
-                ret = next_event_type++;
+        if (WARN_ON(!event))
                 goto out;
-        }
 
-        if (!event->type)
-                event->type = next_event_type++;
-        else if (event->type > __TRACE_LAST_TYPE) {
+        INIT_LIST_HEAD(&event->list);
+
+        if (!event->type) {
+                struct list_head *list = NULL;
+
+                if (next_event_type > FTRACE_MAX_EVENT) {
+
+                        event->type = trace_search_list(&list);
+                        if (!event->type)
+                                goto out;
+
+                } else {
+                        
+                        event->type = next_event_type++;
+                        list = &ftrace_event_list;
+                }
+
+                if (WARN_ON(ftrace_find_event(event->type)))
+                        goto out;
+
+                list_add_tail(&event->list, list);
+
+        } else if (event->type > __TRACE_LAST_TYPE) {
                 printk(KERN_WARNING "Need to add type to trace.h\n");
                 WARN_ON(1);
-        }
-
-        if (ftrace_find_event(event->type))
                 goto out;
+        } else {
+                /* Is this event already used */
+                if (ftrace_find_event(event->type))
+                        goto out;
+        }
 
         if (event->trace == NULL)
                 event->trace = trace_nop_print;
@@ -520,14 +692,25 @@ int register_ftrace_event(struct trace_event *event)
 
         key = event->type & (EVENT_HASHSIZE - 1);
 
-        hlist_add_head_rcu(&event->node, &event_hash[key]);
+        hlist_add_head(&event->node, &event_hash[key]);
 
         ret = event->type;
  out:
-        mutex_unlock(&trace_event_mutex);
+        up_write(&trace_event_mutex);
 
         return ret;
 }
+EXPORT_SYMBOL_GPL(register_ftrace_event);
+
+/*
+ * Used by module code with the trace_event_mutex held for write.
+ */
+int __unregister_ftrace_event(struct trace_event *event)
+{
+        hlist_del(&event->node);
+        list_del(&event->list);
+        return 0;
+}
 
 /**
  * unregister_ftrace_event - remove a no longer used event
@@ -535,12 +718,13 @@ int register_ftrace_event(struct trace_event *event)
  */
 int unregister_ftrace_event(struct trace_event *event)
 {
-        mutex_lock(&trace_event_mutex);
-        hlist_del(&event->node);
-        mutex_unlock(&trace_event_mutex);
+        down_write(&trace_event_mutex);
+        __unregister_ftrace_event(event);
+        up_write(&trace_event_mutex);
 
         return 0;
 }
+EXPORT_SYMBOL_GPL(unregister_ftrace_event);
 
 /*
  * Standard events
@@ -833,14 +1017,16 @@ static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 
         trace_assign_type(field, iter->ent);
 
+        if (!trace_seq_puts(s, "<stack trace>\n"))
+                goto partial;
         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
-                if (i) {
-                        if (!trace_seq_puts(s, " <= "))
-                                goto partial;
+                if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
+                        break;
+                if (!trace_seq_puts(s, " => "))
+                        goto partial;
 
-                        if (!seq_print_ip_sym(s, field->caller[i], flags))
-                                goto partial;
-                }
+                if (!seq_print_ip_sym(s, field->caller[i], flags))
+                        goto partial;
                 if (!trace_seq_puts(s, "\n"))
                         goto partial;
         }
@@ -868,10 +1054,10 @@ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 
         trace_assign_type(field, iter->ent);
 
-        if (!seq_print_userip_objs(field, s, flags))
+        if (!trace_seq_puts(s, "<user stack trace>\n"))
                 goto partial;
 
-        if (!trace_seq_putc(s, '\n'))
+        if (!seq_print_userip_objs(field, s, flags))
                 goto partial;
 
         return TRACE_TYPE_HANDLED;
diff --git a/kernel/trace/trace_output.h b/kernel/trace/trace_output.h
index e0bde39c2dd9..d38bec4a9c30 100644
--- a/kernel/trace/trace_output.h
+++ b/kernel/trace/trace_output.h
@@ -1,41 +1,17 @@
 #ifndef __TRACE_EVENTS_H
 #define __TRACE_EVENTS_H
 
+#include <linux/trace_seq.h>
 #include "trace.h"
 
-typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
-                                              int flags);
-
-struct trace_event {
-        struct hlist_node       node;
-        int                     type;
-        trace_print_func        trace;
-        trace_print_func        raw;
-        trace_print_func        hex;
-        trace_print_func        binary;
-};
-
 extern enum print_line_t
 trace_print_bprintk_msg_only(struct trace_iterator *iter);
 extern enum print_line_t
 trace_print_printk_msg_only(struct trace_iterator *iter);
 
-extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
-        __attribute__ ((format (printf, 2, 3)));
-extern int
-trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
 extern int
 seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
                 unsigned long sym_flags);
-extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
-                                 size_t cnt);
-extern int trace_seq_puts(struct trace_seq *s, const char *str);
-extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
-extern int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len);
-extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
-                                size_t len);
-extern void *trace_seq_reserve(struct trace_seq *s, size_t len);
-extern int trace_seq_path(struct trace_seq *s, struct path *path);
 extern int seq_print_userip_objs(const struct userstack_entry *entry,
                                  struct trace_seq *s, unsigned long sym_flags);
 extern int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
@@ -44,13 +20,17 @@ extern int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 extern int trace_print_context(struct trace_iterator *iter);
 extern int trace_print_lat_context(struct trace_iterator *iter);
 
+extern void trace_event_read_lock(void);
+extern void trace_event_read_unlock(void);
 extern struct trace_event *ftrace_find_event(int type);
-extern int register_ftrace_event(struct trace_event *event);
-extern int unregister_ftrace_event(struct trace_event *event);
 
 extern enum print_line_t trace_nop_print(struct trace_iterator *iter,
                                          int flags);
 
+/* used by module unregistering */
+extern int __unregister_ftrace_event(struct trace_event *event);
+extern struct rw_semaphore trace_event_mutex;
+
 #define MAX_MEMHEX_BYTES        8
 #define HEX_CHARS               (MAX_MEMHEX_BYTES*2 + 1)
 
diff --git a/kernel/trace/trace_power.c b/kernel/trace/trace_power.c
index 118439709fb7..8a30d9874cd4 100644
--- a/kernel/trace/trace_power.c
+++ b/kernel/trace/trace_power.c
@@ -36,6 +36,7 @@ static void probe_power_start(struct power_trace *it, unsigned int type,
 
 static void probe_power_end(struct power_trace *it)
 {
+        struct ftrace_event_call *call = &event_power;
         struct ring_buffer_event *event;
         struct trace_power *entry;
         struct trace_array_cpu *data;
@@ -54,7 +55,8 @@ static void probe_power_end(struct power_trace *it)
                 goto out;
         entry   = ring_buffer_event_data(event);
         entry->state_data = *it;
-        trace_buffer_unlock_commit(tr, event, 0, 0);
+        if (!filter_check_discard(call, entry, tr->buffer, event))
+                trace_buffer_unlock_commit(tr, event, 0, 0);
  out:
         preempt_enable();
 }
@@ -62,6 +64,7 @@ static void probe_power_end(struct power_trace *it)
 static void probe_power_mark(struct power_trace *it, unsigned int type,
                                 unsigned int level)
 {
+        struct ftrace_event_call *call = &event_power;
         struct ring_buffer_event *event;
         struct trace_power *entry;
         struct trace_array_cpu *data;
@@ -84,7 +87,8 @@ static void probe_power_mark(struct power_trace *it, unsigned int type,
                 goto out;
         entry   = ring_buffer_event_data(event);
         entry->state_data = *it;
-        trace_buffer_unlock_commit(tr, event, 0, 0);
+        if (!filter_check_discard(call, entry, tr->buffer, event))
+                trace_buffer_unlock_commit(tr, event, 0, 0);
  out:
         preempt_enable();
 }
diff --git a/kernel/trace/trace_printk.c b/kernel/trace/trace_printk.c
index eb81556107fe..9bece9687b62 100644
--- a/kernel/trace/trace_printk.c
+++ b/kernel/trace/trace_printk.c
@@ -245,17 +245,13 @@ static const struct file_operations ftrace_formats_fops = {
 static __init int init_trace_printk_function_export(void)
 {
         struct dentry *d_tracer;
-        struct dentry *entry;
 
         d_tracer = tracing_init_dentry();
         if (!d_tracer)
                 return 0;
 
-        entry = debugfs_create_file("printk_formats", 0444, d_tracer,
+        trace_create_file("printk_formats", 0444, d_tracer,
                                     NULL, &ftrace_formats_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs "
-                           "'printk_formats' entry\n");
 
         return 0;
 }
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 9117cea6f1ae..a98106dd979c 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -10,7 +10,7 @@
 #include <linux/kallsyms.h>
 #include <linux/uaccess.h>
 #include <linux/ftrace.h>
-#include <trace/sched.h>
+#include <trace/events/sched.h>
 
 #include "trace.h"
 
@@ -29,13 +29,13 @@ probe_sched_switch(struct rq *__rq, struct task_struct *prev,
         int cpu;
         int pc;
 
-        if (!sched_ref || sched_stopped)
+        if (unlikely(!sched_ref))
                 return;
 
         tracing_record_cmdline(prev);
         tracing_record_cmdline(next);
 
-        if (!tracer_enabled)
+        if (!tracer_enabled || sched_stopped)
                 return;
 
         pc = preempt_count();
@@ -56,15 +56,15 @@ probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee, int success)
         unsigned long flags;
         int cpu, pc;
 
-        if (!likely(tracer_enabled))
+        if (unlikely(!sched_ref))
                 return;
 
-        pc = preempt_count();
         tracing_record_cmdline(current);
 
-        if (sched_stopped)
+        if (!tracer_enabled || sched_stopped)
                 return;
 
+        pc = preempt_count();
         local_irq_save(flags);
         cpu = raw_smp_processor_id();
         data = ctx_trace->data[cpu];
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 5bc00e8f153e..eacb27225173 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -15,7 +15,7 @@
 #include <linux/kallsyms.h>
 #include <linux/uaccess.h>
 #include <linux/ftrace.h>
-#include <trace/sched.h>
+#include <trace/events/sched.h>
 
 #include "trace.h"
 
@@ -138,9 +138,6 @@ probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
 
         pc = preempt_count();
 
-        /* The task we are waiting for is waking up */
-        data = wakeup_trace->data[wakeup_cpu];
-
         /* disable local data, not wakeup_cpu data */
         cpu = raw_smp_processor_id();
         disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled);
@@ -154,6 +151,9 @@ probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
         if (unlikely(!tracer_enabled || next != wakeup_task))
                 goto out_unlock;
 
+        /* The task we are waiting for is waking up */
+        data = wakeup_trace->data[wakeup_cpu];
+
         trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc);
         tracing_sched_switch_trace(wakeup_trace, prev, next, flags, pc);
 
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 08f4eb2763d1..00dd6485bdd7 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -16,6 +16,7 @@ static inline int trace_valid_entry(struct trace_entry *entry)
         case TRACE_BRANCH:
         case TRACE_GRAPH_ENT:
         case TRACE_GRAPH_RET:
+        case TRACE_HW_BRANCHES:
                 return 1;
         }
         return 0;
@@ -188,6 +189,7 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
 #else
 # define trace_selftest_startup_dynamic_tracing(trace, tr, func) ({ 0; })
 #endif /* CONFIG_DYNAMIC_FTRACE */
+
 /*
  * Simple verification test of ftrace function tracer.
  * Enable ftrace, sleep 1/10 second, and then read the trace
@@ -749,3 +751,59 @@ trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
         return ret;
 }
 #endif /* CONFIG_BRANCH_TRACER */
+
+#ifdef CONFIG_HW_BRANCH_TRACER
+int
+trace_selftest_startup_hw_branches(struct tracer *trace,
+                                   struct trace_array *tr)
+{
+        struct trace_iterator *iter;
+        struct tracer tracer;
+        unsigned long count;
+        int ret;
+
+        if (!trace->open) {
+                printk(KERN_CONT "missing open function...");
+                return -1;
+        }
+
+        ret = tracer_init(trace, tr);
+        if (ret) {
+                warn_failed_init_tracer(trace, ret);
+                return ret;
+        }
+
+        /*
+         * The hw-branch tracer needs to collect the trace from the various
+         * cpu trace buffers - before tracing is stopped.
+         */
+        iter = kzalloc(sizeof(*iter), GFP_KERNEL);
+        if (!iter)
+                return -ENOMEM;
+
+        memcpy(&tracer, trace, sizeof(tracer));
+
+        iter->trace = &tracer;
+        iter->tr = tr;
+        iter->pos = -1;
+        mutex_init(&iter->mutex);
+
+        trace->open(iter);
+
+        mutex_destroy(&iter->mutex);
+        kfree(iter);
+
+        tracing_stop();
+
+        ret = trace_test_buffer(tr, &count);
+        trace->reset(tr);
+        tracing_start();
+
+        if (!ret && !count) {
+                printk(KERN_CONT "no entries found..");
+                ret = -1;
+        }
+
+        return ret;
+}
+#endif /* CONFIG_HW_BRANCH_TRACER */
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index c750f65f9661..2d7aebd71dbd 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -265,7 +265,7 @@ static int t_show(struct seq_file *m, void *v)
                 seq_printf(m, "        Depth    Size   Location"
                            "    (%d entries)\n"
                            "        -----    ----   --------\n",
-                           max_stack_trace.nr_entries);
+                           max_stack_trace.nr_entries - 1);
 
                 if (!stack_tracer_enabled && !max_stack_size)
                         print_disabled(m);
@@ -352,19 +352,14 @@ __setup("stacktrace", enable_stacktrace);
 static __init int stack_trace_init(void)
 {
         struct dentry *d_tracer;
-        struct dentry *entry;
 
         d_tracer = tracing_init_dentry();
 
-        entry = debugfs_create_file("stack_max_size", 0644, d_tracer,
-                                    &max_stack_size, &stack_max_size_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'stack_max_size' entry\n");
+        trace_create_file("stack_max_size", 0644, d_tracer,
+                        &max_stack_size, &stack_max_size_fops);
 
-        entry = debugfs_create_file("stack_trace", 0444, d_tracer,
-                                    NULL, &stack_trace_fops);
-        if (!entry)
-                pr_warning("Could not create debugfs 'stack_trace' entry\n");
+        trace_create_file("stack_trace", 0444, d_tracer,
+                        NULL, &stack_trace_fops);
 
         if (stack_tracer_enabled)
                 register_ftrace_function(&trace_ops);
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index acdebd771a93..c00643733f4c 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -1,7 +1,7 @@
 /*
  * Infrastructure for statistic tracing (histogram output).
  *
- * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ * Copyright (C) 2008-2009 Frederic Weisbecker <fweisbec@gmail.com>
  *
  * Based on the code from trace_branch.c which is
  * Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com>
@@ -10,22 +10,27 @@
 
 
 #include <linux/list.h>
+#include <linux/rbtree.h>
 #include <linux/debugfs.h>
 #include "trace_stat.h"
 #include "trace.h"
 
 
-/* List of stat entries from a tracer */
-struct trace_stat_list {
-        struct list_head        list;
+/*
+ * List of stat red-black nodes from a tracer
+ * We use a such tree to sort quickly the stat
+ * entries from the tracer.
+ */
+struct stat_node {
+        struct rb_node          node;
         void                    *stat;
 };
 
 /* A stat session is the stats output in one file */
-struct tracer_stat_session {
+struct stat_session {
         struct list_head        session_list;
         struct tracer_stat      *ts;
-        struct list_head        stat_list;
+        struct rb_root          stat_root;
         struct mutex            stat_mutex;
         struct dentry           *file;
 };
@@ -37,18 +42,48 @@ static DEFINE_MUTEX(all_stat_sessions_mutex);
 /* The root directory for all stat files */
 static struct dentry            *stat_dir;
 
+/*
+ * Iterate through the rbtree using a post order traversal path
+ * to release the next node.
+ * It won't necessary release one at each iteration
+ * but it will at least advance closer to the next one
+ * to be released.
+ */
+static struct rb_node *release_next(struct rb_node *node)
+{
+        struct stat_node *snode;
+        struct rb_node *parent = rb_parent(node);
+
+        if (node->rb_left)
+                return node->rb_left;
+        else if (node->rb_right)
+                return node->rb_right;
+        else {
+                if (!parent)
+                        ;
+                else if (parent->rb_left == node)
+                        parent->rb_left = NULL;
+                else
+                        parent->rb_right = NULL;
+
+                snode = container_of(node, struct stat_node, node);
+                kfree(snode);
+
+                return parent;
+        }
+}
 
-static void reset_stat_session(struct tracer_stat_session *session)
+static void reset_stat_session(struct stat_session *session)
 {
-        struct trace_stat_list *node, *next;
+        struct rb_node *node = session->stat_root.rb_node;
 
-        list_for_each_entry_safe(node, next, &session->stat_list, list)
-                kfree(node);
+        while (node)
+                node = release_next(node);
 
-        INIT_LIST_HEAD(&session->stat_list);
+        session->stat_root = RB_ROOT;
 }
 
-static void destroy_session(struct tracer_stat_session *session)
+static void destroy_session(struct stat_session *session)
 {
         debugfs_remove(session->file);
         reset_stat_session(session);
@@ -56,25 +91,60 @@ static void destroy_session(struct tracer_stat_session *session)
         kfree(session);
 }
 
+typedef int (*cmp_stat_t)(void *, void *);
+
+static int insert_stat(struct rb_root *root, void *stat, cmp_stat_t cmp)
+{
+        struct rb_node **new = &(root->rb_node), *parent = NULL;
+        struct stat_node *data;
+
+        data = kzalloc(sizeof(*data), GFP_KERNEL);
+        if (!data)
+                return -ENOMEM;
+        data->stat = stat;
+
+        /*
+         * Figure out where to put new node
+         * This is a descendent sorting
+         */
+        while (*new) {
+                struct stat_node *this;
+                int result;
+
+                this = container_of(*new, struct stat_node, node);
+                result = cmp(data->stat, this->stat);
+
+                parent = *new;
+                if (result >= 0)
+                        new = &((*new)->rb_left);
+                else
+                        new = &((*new)->rb_right);
+        }
+
+        rb_link_node(&data->node, parent, new);
+        rb_insert_color(&data->node, root);
+        return 0;
+}
+
 /*
  * For tracers that don't provide a stat_cmp callback.
- * This one will force an immediate insertion on tail of
- * the list.
+ * This one will force an insertion as right-most node
+ * in the rbtree.
  */
 static int dummy_cmp(void *p1, void *p2)
 {
-        return 1;
+        return -1;
 }
 
 /*
- * Initialize the stat list at each trace_stat file opening.
+ * Initialize the stat rbtree at each trace_stat file opening.
  * All of these copies and sorting are required on all opening
  * since the stats could have changed between two file sessions.
  */
-static int stat_seq_init(struct tracer_stat_session *session)
+static int stat_seq_init(struct stat_session *session)
 {
-        struct trace_stat_list *iter_entry, *new_entry;
         struct tracer_stat *ts = session->ts;
+        struct rb_root *root = &session->stat_root;
         void *stat;
         int ret = 0;
         int i;
@@ -85,29 +155,16 @@ static int stat_seq_init(struct tracer_stat_session *session)
         if (!ts->stat_cmp)
                 ts->stat_cmp = dummy_cmp;
 
-        stat = ts->stat_start();
+        stat = ts->stat_start(ts);
         if (!stat)
                 goto exit;
 
-        /*
-         * The first entry. Actually this is the second, but the first
-         * one (the stat_list head) is pointless.
-         */
-        new_entry = kmalloc(sizeof(struct trace_stat_list), GFP_KERNEL);
-        if (!new_entry) {
-                ret = -ENOMEM;
+        ret = insert_stat(root, stat, ts->stat_cmp);
+        if (ret)
                 goto exit;
-        }
-
-        INIT_LIST_HEAD(&new_entry->list);
-
-        list_add(&new_entry->list, &session->stat_list);
-
-        new_entry->stat = stat;
 
         /*
-         * Iterate over the tracer stat entries and store them in a sorted
-         * list.
+         * Iterate over the tracer stat entries and store them in an rbtree.
          */
         for (i = 1; ; i++) {
                 stat = ts->stat_next(stat, i);
@@ -116,36 +173,16 @@ static int stat_seq_init(struct tracer_stat_session *session)
                 if (!stat)
                         break;
 
-                new_entry = kmalloc(sizeof(struct trace_stat_list), GFP_KERNEL);
-                if (!new_entry) {
-                        ret = -ENOMEM;
-                        goto exit_free_list;
-                }
-
-                INIT_LIST_HEAD(&new_entry->list);
-                new_entry->stat = stat;
-
-                list_for_each_entry_reverse(iter_entry, &session->stat_list,
-                                list) {
-
-                        /* Insertion with a descendent sorting */
-                        if (ts->stat_cmp(iter_entry->stat,
-                                        new_entry->stat) >= 0) {
-
-                                list_add(&new_entry->list, &iter_entry->list);
-                                break;
-                        }
-                }
-
-                /* The current larger value */
-                if (list_empty(&new_entry->list))
-                        list_add(&new_entry->list, &session->stat_list);
+                ret = insert_stat(root, stat, ts->stat_cmp);
+                if (ret)
+                        goto exit_free_rbtree;
         }
+
 exit:
         mutex_unlock(&session->stat_mutex);
         return ret;
 
-exit_free_list:
+exit_free_rbtree:
         reset_stat_session(session);
         mutex_unlock(&session->stat_mutex);
         return ret;
@@ -154,38 +191,51 @@ exit_free_list:
 
 static void *stat_seq_start(struct seq_file *s, loff_t *pos)
 {
-        struct tracer_stat_session *session = s->private;
+        struct stat_session *session = s->private;
+        struct rb_node *node;
+        int i;
 
-        /* Prevent from tracer switch or stat_list modification */
+        /* Prevent from tracer switch or rbtree modification */
         mutex_lock(&session->stat_mutex);
 
         /* If we are in the beginning of the file, print the headers */
-        if (!*pos && session->ts->stat_headers)
+        if (!*pos && session->ts->stat_headers) {
+                (*pos)++;
                 return SEQ_START_TOKEN;
+        }
 
-        return seq_list_start(&session->stat_list, *pos);
+        node = rb_first(&session->stat_root);
+        for (i = 0; node && i < *pos; i++)
+                node = rb_next(node);
+
+        (*pos)++;
+
+        return node;
 }
 
 static void *stat_seq_next(struct seq_file *s, void *p, loff_t *pos)
 {
-        struct tracer_stat_session *session = s->private;
+        struct stat_session *session = s->private;
+        struct rb_node *node = p;
+
+        (*pos)++;
 
         if (p == SEQ_START_TOKEN)
-                return seq_list_start(&session->stat_list, *pos);
+                return rb_first(&session->stat_root);
 
-        return seq_list_next(p, &session->stat_list, pos);
+        return rb_next(node);
 }
 
 static void stat_seq_stop(struct seq_file *s, void *p)
 {
-        struct tracer_stat_session *session = s->private;
+        struct stat_session *session = s->private;
         mutex_unlock(&session->stat_mutex);
 }
 
 static int stat_seq_show(struct seq_file *s, void *v)
 {
-        struct tracer_stat_session *session = s->private;
-        struct trace_stat_list *l = list_entry(v, struct trace_stat_list, list);
+        struct stat_session *session = s->private;
+        struct stat_node *l = container_of(v, struct stat_node, node);
 
         if (v == SEQ_START_TOKEN)
                 return session->ts->stat_headers(s);
@@ -205,7 +255,7 @@ static int tracing_stat_open(struct inode *inode, struct file *file)
 {
         int ret;
 
-        struct tracer_stat_session *session = inode->i_private;
+        struct stat_session *session = inode->i_private;
 
         ret = seq_open(file, &trace_stat_seq_ops);
         if (!ret) {
@@ -218,11 +268,11 @@ static int tracing_stat_open(struct inode *inode, struct file *file)
 }
 
 /*
- * Avoid consuming memory with our now useless list.
+ * Avoid consuming memory with our now useless rbtree.
  */
 static int tracing_stat_release(struct inode *i, struct file *f)
 {
-        struct tracer_stat_session *session = i->i_private;
+        struct stat_session *session = i->i_private;
 
         mutex_lock(&session->stat_mutex);
         reset_stat_session(session);
@@ -251,7 +301,7 @@ static int tracing_stat_init(void)
         return 0;
 }
 
-static int init_stat_file(struct tracer_stat_session *session)
+static int init_stat_file(struct stat_session *session)
 {
         if (!stat_dir && tracing_stat_init())
                 return -ENODEV;
@@ -266,7 +316,7 @@ static int init_stat_file(struct tracer_stat_session *session)
 
 int register_stat_tracer(struct tracer_stat *trace)
 {
-        struct tracer_stat_session *session, *node, *tmp;
+        struct stat_session *session, *node;
         int ret;
 
         if (!trace)
@@ -277,7 +327,7 @@ int register_stat_tracer(struct tracer_stat *trace)
 
         /* Already registered? */
         mutex_lock(&all_stat_sessions_mutex);
-        list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) {
+        list_for_each_entry(node, &all_stat_sessions, session_list) {
                 if (node->ts == trace) {
                         mutex_unlock(&all_stat_sessions_mutex);
                         return -EINVAL;
@@ -286,15 +336,13 @@ int register_stat_tracer(struct tracer_stat *trace)
         mutex_unlock(&all_stat_sessions_mutex);
 
         /* Init the session */
-        session = kmalloc(sizeof(struct tracer_stat_session), GFP_KERNEL);
+        session = kzalloc(sizeof(*session), GFP_KERNEL);
         if (!session)
                 return -ENOMEM;
 
         session->ts = trace;
         INIT_LIST_HEAD(&session->session_list);
-        INIT_LIST_HEAD(&session->stat_list);
         mutex_init(&session->stat_mutex);
-        session->file = NULL;
 
         ret = init_stat_file(session);
         if (ret) {
@@ -312,7 +360,7 @@ int register_stat_tracer(struct tracer_stat *trace)
 
 void unregister_stat_tracer(struct tracer_stat *trace)
 {
-        struct tracer_stat_session *node, *tmp;
+        struct stat_session *node, *tmp;
 
         mutex_lock(&all_stat_sessions_mutex);
         list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) {
diff --git a/kernel/trace/trace_stat.h b/kernel/trace/trace_stat.h
index 202274cf7f3d..f3546a2cd826 100644
--- a/kernel/trace/trace_stat.h
+++ b/kernel/trace/trace_stat.h
@@ -12,7 +12,7 @@ struct tracer_stat {
         /* The name of your stat file */
         const char              *name;
         /* Iteration over statistic entries */
-        void                    *(*stat_start)(void);
+        void                    *(*stat_start)(struct tracer_stat *trace);
         void                    *(*stat_next)(void *prev, int idx);
         /* Compare two entries for stats sorting */
         int                     (*stat_cmp)(void *p1, void *p2);
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
index 91fd19c2149f..f6693969287d 100644
--- a/kernel/trace/trace_sysprof.c
+++ b/kernel/trace/trace_sysprof.c
@@ -203,7 +203,8 @@ static void start_stack_timer(void *unused)
         hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
         hrtimer->function = stack_trace_timer_fn;
 
-        hrtimer_start(hrtimer, ns_to_ktime(sample_period), HRTIMER_MODE_REL);
+        hrtimer_start(hrtimer, ns_to_ktime(sample_period),
+                      HRTIMER_MODE_REL_PINNED);
 }
 
 static void start_stack_timers(void)
@@ -321,11 +322,7 @@ static const struct file_operations sysprof_sample_fops = {
 
 void init_tracer_sysprof_debugfs(struct dentry *d_tracer)
 {
-        struct dentry *entry;
 
-        entry = debugfs_create_file("sysprof_sample_period", 0644,
+        trace_create_file("sysprof_sample_period", 0644,
                         d_tracer, NULL, &sysprof_sample_fops);
-        if (entry)
-                return;
-        pr_warning("Could not create debugfs 'sysprof_sample_period' entry\n");
 }
diff --git a/kernel/trace/trace_workqueue.c b/kernel/trace/trace_workqueue.c
index 797201e4a137..97fcea4acce1 100644
--- a/kernel/trace/trace_workqueue.c
+++ b/kernel/trace/trace_workqueue.c
@@ -6,7 +6,7 @@
  */
 
 
-#include <trace/workqueue.h>
+#include <trace/events/workqueue.h>
 #include <linux/list.h>
 #include <linux/percpu.h>
 #include "trace_stat.h"
@@ -16,8 +16,6 @@
 /* A cpu workqueue thread */
 struct cpu_workqueue_stats {
         struct list_head            list;
-/* Useful to know if we print the cpu headers */
-        bool                        first_entry;
         int                         cpu;
         pid_t                       pid;
 /* Can be inserted from interrupt or user context, need to be atomic */
@@ -47,12 +45,11 @@ probe_workqueue_insertion(struct task_struct *wq_thread,
                           struct work_struct *work)
 {
         int cpu = cpumask_first(&wq_thread->cpus_allowed);
-        struct cpu_workqueue_stats *node, *next;
+        struct cpu_workqueue_stats *node;
         unsigned long flags;
 
         spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
-        list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
-                                                        list) {
+        list_for_each_entry(node, &workqueue_cpu_stat(cpu)->list, list) {
                 if (node->pid == wq_thread->pid) {
                         atomic_inc(&node->inserted);
                         goto found;
@@ -69,12 +66,11 @@ probe_workqueue_execution(struct task_struct *wq_thread,
                           struct work_struct *work)
 {
         int cpu = cpumask_first(&wq_thread->cpus_allowed);
-        struct cpu_workqueue_stats *node, *next;
+        struct cpu_workqueue_stats *node;
         unsigned long flags;
 
         spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
-        list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
-                                                        list) {
+        list_for_each_entry(node, &workqueue_cpu_stat(cpu)->list, list) {
                 if (node->pid == wq_thread->pid) {
                         node->executed++;
                         goto found;
@@ -105,8 +101,6 @@ static void probe_workqueue_creation(struct task_struct *wq_thread, int cpu)
         cws->pid = wq_thread->pid;
 
         spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
-        if (list_empty(&workqueue_cpu_stat(cpu)->list))
-                cws->first_entry = true;
         list_add_tail(&cws->list, &workqueue_cpu_stat(cpu)->list);
         spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
 }
@@ -152,7 +146,7 @@ static struct cpu_workqueue_stats *workqueue_stat_start_cpu(int cpu)
         return ret;
 }
 
-static void *workqueue_stat_start(void)
+static void *workqueue_stat_start(struct tracer_stat *trace)
 {
         int cpu;
         void *ret = NULL;
@@ -191,16 +185,9 @@ static void *workqueue_stat_next(void *prev, int idx)
 static int workqueue_stat_show(struct seq_file *s, void *p)
 {
         struct cpu_workqueue_stats *cws = p;
-        unsigned long flags;
-        int cpu = cws->cpu;
         struct pid *pid;
         struct task_struct *tsk;
 
-        spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
-        if (&cws->list == workqueue_cpu_stat(cpu)->list.next)
-                seq_printf(s, "\n");
-        spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
-
         pid = find_get_pid(cws->pid);
         if (pid) {
                 tsk = get_pid_task(pid, PIDTYPE_PID);
diff --git a/kernel/user.c b/kernel/user.c
index 850e0ba41c1e..2c000e7132ac 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -75,21 +75,6 @@ static void uid_hash_remove(struct user_struct *up)
         put_user_ns(up->user_ns);
 }
 
-static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
-{
-        struct user_struct *user;
-        struct hlist_node *h;
-
-        hlist_for_each_entry(user, h, hashent, uidhash_node) {
-                if (user->uid == uid) {
-                        atomic_inc(&user->__count);
-                        return user;
-                }
-        }
-
-        return NULL;
-}
-
 #ifdef CONFIG_USER_SCHED
 
 static void sched_destroy_user(struct user_struct *up)
@@ -119,6 +104,23 @@ static int sched_create_user(struct user_struct *up) { return 0; }
 
 #if defined(CONFIG_USER_SCHED) && defined(CONFIG_SYSFS)
 
+static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
+{
+        struct user_struct *user;
+        struct hlist_node *h;
+
+        hlist_for_each_entry(user, h, hashent, uidhash_node) {
+                if (user->uid == uid) {
+                        /* possibly resurrect an "almost deleted" object */
+                        if (atomic_inc_return(&user->__count) == 1)
+                                cancel_delayed_work(&user->work);
+                        return user;
+                }
+        }
+
+        return NULL;
+}
+
 static struct kset *uids_kset; /* represents the /sys/kernel/uids/ directory */
 static DEFINE_MUTEX(uids_mutex);
 
@@ -283,12 +285,12 @@ int __init uids_sysfs_init(void)
         return uids_user_create(&root_user);
 }
 
-/* work function to remove sysfs directory for a user and free up
+/* delayed work function to remove sysfs directory for a user and free up
  * corresponding structures.
  */
 static void cleanup_user_struct(struct work_struct *w)
 {
-        struct user_struct *up = container_of(w, struct user_struct, work);
+        struct user_struct *up = container_of(w, struct user_struct, work.work);
         unsigned long flags;
         int remove_user = 0;
 
@@ -297,15 +299,12 @@ static void cleanup_user_struct(struct work_struct *w)
          */
         uids_mutex_lock();
 
-        local_irq_save(flags);
-
-        if (atomic_dec_and_lock(&up->__count, &uidhash_lock)) {
+        spin_lock_irqsave(&uidhash_lock, flags);
+        if (atomic_read(&up->__count) == 0) {
                 uid_hash_remove(up);
                 remove_user = 1;
-                spin_unlock_irqrestore(&uidhash_lock, flags);
-        } else {
-                local_irq_restore(flags);
         }
+        spin_unlock_irqrestore(&uidhash_lock, flags);
 
         if (!remove_user)
                 goto done;
@@ -331,16 +330,28 @@ done:
  */
 static void free_user(struct user_struct *up, unsigned long flags)
 {
-        /* restore back the count */
-        atomic_inc(&up->__count);
         spin_unlock_irqrestore(&uidhash_lock, flags);
-
-        INIT_WORK(&up->work, cleanup_user_struct);
-        schedule_work(&up->work);
+        INIT_DELAYED_WORK(&up->work, cleanup_user_struct);
+        schedule_delayed_work(&up->work, msecs_to_jiffies(1000));
 }
 
 #else   /* CONFIG_USER_SCHED && CONFIG_SYSFS */
 
+static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
+{
+        struct user_struct *user;
+        struct hlist_node *h;
+
+        hlist_for_each_entry(user, h, hashent, uidhash_node) {
+                if (user->uid == uid) {
+                        atomic_inc(&user->__count);
+                        return user;
+                }
+        }
+
+        return NULL;
+}
+
 int uids_sysfs_init(void) { return 0; }
 static inline int uids_user_create(struct user_struct *up) { return 0; }
 static inline void uids_mutex_lock(void) { }
diff --git a/kernel/utsname.c b/kernel/utsname.c
index 815237a55af8..8a82b4b8ea52 100644
--- a/kernel/utsname.c
+++ b/kernel/utsname.c
@@ -15,6 +15,16 @@
 #include <linux/err.h>
 #include <linux/slab.h>
 
+static struct uts_namespace *create_uts_ns(void)
+{
+        struct uts_namespace *uts_ns;
+
+        uts_ns = kmalloc(sizeof(struct uts_namespace), GFP_KERNEL);
+        if (uts_ns)
+                kref_init(&uts_ns->kref);
+        return uts_ns;
+}
+
 /*
  * Clone a new ns copying an original utsname, setting refcount to 1
  * @old_ns: namespace to clone
@@ -24,14 +34,13 @@ static struct uts_namespace *clone_uts_ns(struct uts_namespace *old_ns)
 {
         struct uts_namespace *ns;
 
-        ns = kmalloc(sizeof(struct uts_namespace), GFP_KERNEL);
+        ns = create_uts_ns();
         if (!ns)
                 return ERR_PTR(-ENOMEM);
 
         down_read(&uts_sem);
         memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
         up_read(&uts_sem);
-        kref_init(&ns->kref);
         return ns;
 }
 
diff --git a/kernel/wait.c b/kernel/wait.c
index 42a2dbc181c8..ea7c3b4275cf 100644
--- a/kernel/wait.c
+++ b/kernel/wait.c
@@ -154,7 +154,7 @@ void abort_exclusive_wait(wait_queue_head_t *q, wait_queue_t *wait,
         if (!list_empty(&wait->task_list))
                 list_del_init(&wait->task_list);
         else if (waitqueue_active(q))
-                __wake_up_common(q, mode, 1, 0, key);
+                __wake_up_locked_key(q, mode, key);
         spin_unlock_irqrestore(&q->lock, flags);
 }
 EXPORT_SYMBOL(abort_exclusive_wait);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index f71fb2a08950..0668795d8818 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -33,7 +33,8 @@
 #include <linux/kallsyms.h>
 #include <linux/debug_locks.h>
 #include <linux/lockdep.h>
-#include <trace/workqueue.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/workqueue.h>
 
 /*
  * The per-CPU workqueue (if single thread, we always use the first
@@ -124,8 +125,6 @@ struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
         return (void *) (atomic_long_read(&work->data) & WORK_STRUCT_WQ_DATA_MASK);
 }
 
-DEFINE_TRACE(workqueue_insertion);
-
 static void insert_work(struct cpu_workqueue_struct *cwq,
                         struct work_struct *work, struct list_head *head)
 {
@@ -262,8 +261,6 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
 }
 EXPORT_SYMBOL_GPL(queue_delayed_work_on);
 
-DEFINE_TRACE(workqueue_execution);
-
 static void run_workqueue(struct cpu_workqueue_struct *cwq)
 {
         spin_lock_irq(&cwq->lock);
@@ -753,8 +750,6 @@ init_cpu_workqueue(struct workqueue_struct *wq, int cpu)
         return cwq;
 }
 
-DEFINE_TRACE(workqueue_creation);
-
 static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
 {
         struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
@@ -860,8 +855,6 @@ struct workqueue_struct *__create_workqueue_key(const char *name,
 }
 EXPORT_SYMBOL_GPL(__create_workqueue_key);
 
-DEFINE_TRACE(workqueue_destruction);
-
 static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
 {
         /*