29 files changed, 649 insertions, 340 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 29b532e718f7..021e1138556e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -568,18 +568,18 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
          * the value intact in a core dump, and to save the unnecessary
          * trouble otherwise.  Userland only wants this done for a sys_exit.
          */
-        if (tsk->clear_child_tid
-            && !(tsk->flags & PF_SIGNALED)
-            && atomic_read(&mm->mm_users) > 1) {
-                u32 __user * tidptr = tsk->clear_child_tid;
+        if (tsk->clear_child_tid) {
+                if (!(tsk->flags & PF_SIGNALED) &&
+                    atomic_read(&mm->mm_users) > 1) {
+                        /*
+                         * We don't check the error code - if userspace has
+                         * not set up a proper pointer then tough luck.
+                         */
+                        put_user(0, tsk->clear_child_tid);
+                        sys_futex(tsk->clear_child_tid, FUTEX_WAKE,
+                                        1, NULL, NULL, 0);
+                }
                 tsk->clear_child_tid = NULL;
-
-                /*
-                 * We don't check the error code - if userspace has
-                 * not set up a proper pointer then tough luck.
-                 */
-                put_user(0, tidptr);
-                sys_futex(tidptr, FUTEX_WAKE, 1, NULL, NULL, 0);
         }
 }
 
@@ -1269,6 +1269,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         write_unlock_irq(&tasklist_lock);
         proc_fork_connector(p);
         cgroup_post_fork(p);
+        perf_counter_fork(p);
         return p;
 
 bad_fork_free_pid:
@@ -1410,9 +1411,6 @@ long do_fork(unsigned long clone_flags,
                         init_completion(&vfork);
                 }
 
-                if (!(clone_flags & CLONE_THREAD))
-                        perf_counter_fork(p);
-
                 audit_finish_fork(p);
                 tracehook_report_clone(regs, clone_flags, nr, p);
 
diff --git a/kernel/futex.c b/kernel/futex.c
index 0672ff88f159..e18cfbdc7190 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1010,15 +1010,19 @@ void requeue_futex(struct futex_q *q, struct futex_hash_bucket *hb1,
  * 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
+ * hb:  the hash_bucket 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.
+ * atomic lock acquisition.  Set the q->lock_ptr to the requeue target hb->lock
+ * to protect access to the pi_state to fixup the owner later.  Must be called
+ * with both q->lock_ptr and hb->lock held.
  */
 static inline
-void requeue_pi_wake_futex(struct futex_q *q, union futex_key *key)
+void requeue_pi_wake_futex(struct futex_q *q, union futex_key *key,
+                           struct futex_hash_bucket *hb)
 {
         drop_futex_key_refs(&q->key);
         get_futex_key_refs(key);
@@ -1030,6 +1034,11 @@ void requeue_pi_wake_futex(struct futex_q *q, union futex_key *key)
         WARN_ON(!q->rt_waiter);
         q->rt_waiter = NULL;
 
+        q->lock_ptr = &hb->lock;
+#ifdef CONFIG_DEBUG_PI_LIST
+        q->list.plist.lock = &hb->lock;
+#endif
+
         wake_up_state(q->task, TASK_NORMAL);
 }
 
@@ -1088,7 +1097,7 @@ static int futex_proxy_trylock_atomic(u32 __user *pifutex,
         ret = futex_lock_pi_atomic(pifutex, hb2, key2, ps, top_waiter->task,
                                    set_waiters);
         if (ret == 1)
-                requeue_pi_wake_futex(top_waiter, key2);
+                requeue_pi_wake_futex(top_waiter, key2, hb2);
 
         return ret;
 }
@@ -1247,8 +1256,15 @@ retry_private:
                 if (!match_futex(&this->key, &key1))
                         continue;
 
-                WARN_ON(!requeue_pi && this->rt_waiter);
-                WARN_ON(requeue_pi && !this->rt_waiter);
+                /*
+                 * FUTEX_WAIT_REQEUE_PI and FUTEX_CMP_REQUEUE_PI should always
+                 * be paired with each other and no other futex ops.
+                 */
+                if ((requeue_pi && !this->rt_waiter) ||
+                    (!requeue_pi && this->rt_waiter)) {
+                        ret = -EINVAL;
+                        break;
+                }
 
                 /*
                  * Wake nr_wake waiters.  For requeue_pi, if we acquired the
@@ -1273,7 +1289,7 @@ retry_private:
                                                         this->task, 1);
                         if (ret == 1) {
                                 /* We got the lock. */
-                                requeue_pi_wake_futex(this, &key2);
+                                requeue_pi_wake_futex(this, &key2, hb2);
                                 continue;
                         } else if (ret) {
                                 /* -EDEADLK */
diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index d607a5b9ee29..235716556bf1 100644
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -180,7 +180,8 @@ asmlinkage long compat_sys_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 (get_compat_timespec(&ts, utime))
                         return -EFAULT;
                 if (!timespec_valid(&ts))
@@ -191,7 +192,8 @@ asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
                         t = ktime_add_safe(ktime_get(), t);
                 tp = &t;
         }
-        if (cmd == FUTEX_REQUEUE || cmd == FUTEX_CMP_REQUEUE)
+        if (cmd == FUTEX_REQUEUE || cmd == FUTEX_CMP_REQUEUE ||
+            cmd == FUTEX_CMP_REQUEUE_PI || cmd == FUTEX_WAKE_OP)
                 val2 = (int) (unsigned long) utime;
 
         return do_futex(uaddr, op, val, tp, uaddr2, val2, val3);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 61c679db4687..d222515a5a06 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -761,7 +761,6 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
 {
         struct irq_desc *desc = irq_to_desc(irq);
         struct irqaction *action, **action_ptr;
-        struct task_struct *irqthread;
         unsigned long flags;
 
         WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
@@ -809,9 +808,6 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
                         desc->chip->disable(irq);
         }
 
-        irqthread = action->thread;
-        action->thread = NULL;
-
         spin_unlock_irqrestore(&desc->lock, flags);
 
         unregister_handler_proc(irq, action);
@@ -819,12 +815,6 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
         /* Make sure it's not being used on another CPU: */
         synchronize_irq(irq);
 
-        if (irqthread) {
-                if (!test_bit(IRQTF_DIED, &action->thread_flags))
-                        kthread_stop(irqthread);
-                put_task_struct(irqthread);
-        }
-
 #ifdef CONFIG_DEBUG_SHIRQ
         /*
          * It's a shared IRQ -- the driver ought to be prepared for an IRQ
@@ -840,6 +830,13 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
                 local_irq_restore(flags);
         }
 #endif
+
+        if (action->thread) {
+                if (!test_bit(IRQTF_DIED, &action->thread_flags))
+                        kthread_stop(action->thread);
+                put_task_struct(action->thread);
+        }
+
         return action;
 }
 
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
index 2f69bee57bf2..3fd30197da2e 100644
--- a/kernel/irq/numa_migrate.c
+++ b/kernel/irq/numa_migrate.c
@@ -107,8 +107,8 @@ out_unlock:
 
 struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
 {
-        /* those all static, do move them */
-        if (desc->irq < NR_IRQS_LEGACY)
+        /* those static or target node is -1, do not move them */
+        if (desc->irq < NR_IRQS_LEGACY || node == -1)
                 return desc;
 
         if (desc->node != node)
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 16b5739c516a..0540948e29ab 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -694,7 +694,7 @@ int __kprobes register_kprobe(struct kprobe *p)
         p->addr = addr;
 
         preempt_disable();
-        if (!__kernel_text_address((unsigned long) p->addr) ||
+        if (!kernel_text_address((unsigned long) p->addr) ||
             in_kprobes_functions((unsigned long) p->addr)) {
                 preempt_enable();
                 return -EINVAL;
diff --git a/kernel/lockdep_proc.c b/kernel/lockdep_proc.c
index d7135aa2d2c4..e94caa666dba 100644
--- a/kernel/lockdep_proc.c
+++ b/kernel/lockdep_proc.c
@@ -758,7 +758,8 @@ static int __init lockdep_proc_init(void)
                     &proc_lockdep_stats_operations);
 
 #ifdef CONFIG_LOCK_STAT
-        proc_create("lock_stat", S_IRUSR, NULL, &proc_lock_stat_operations);
+        proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL,
+                    &proc_lock_stat_operations);
 #endif
 
         return 0;
diff --git a/kernel/panic.c b/kernel/panic.c
index 984b3ecbd72c..512ab73b0ca3 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -301,6 +301,7 @@ int oops_may_print(void)
  */
 void oops_enter(void)
 {
+        tracing_off();
         /* can't trust the integrity of the kernel anymore: */
         debug_locks_off();
         do_oops_enter_exit();
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 950931041954..534e20d14d63 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -42,6 +42,7 @@ 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;
+static atomic_t nr_task_counters __read_mostly;
 
 /*
  * perf counter paranoia level:
@@ -87,6 +88,7 @@ void __weak hw_perf_disable(void)		{ barrier(); }
 void __weak hw_perf_enable(void)                { barrier(); }
 
 void __weak hw_perf_counter_setup(int cpu)      { barrier(); }
+void __weak hw_perf_counter_setup_online(int cpu)       { barrier(); }
 
 int __weak
 hw_perf_group_sched_in(struct perf_counter *group_leader,
@@ -305,6 +307,10 @@ counter_sched_out(struct perf_counter *counter,
                 return;
 
         counter->state = PERF_COUNTER_STATE_INACTIVE;
+        if (counter->pending_disable) {
+                counter->pending_disable = 0;
+                counter->state = PERF_COUNTER_STATE_OFF;
+        }
         counter->tstamp_stopped = ctx->time;
         counter->pmu->disable(counter);
         counter->oncpu = -1;
@@ -1103,7 +1109,7 @@ static void perf_counter_sync_stat(struct perf_counter_context *ctx,
                 __perf_counter_sync_stat(counter, next_counter);
 
                 counter = list_next_entry(counter, event_entry);
-                next_counter = list_next_entry(counter, event_entry);
+                next_counter = list_next_entry(next_counter, event_entry);
         }
 }
 
@@ -1654,6 +1660,8 @@ static void free_counter(struct perf_counter *counter)
                         atomic_dec(&nr_mmap_counters);
                 if (counter->attr.comm)
                         atomic_dec(&nr_comm_counters);
+                if (counter->attr.task)
+                        atomic_dec(&nr_task_counters);
         }
 
         if (counter->destroy)
@@ -1688,14 +1696,133 @@ static int perf_release(struct inode *inode, struct file *file)
         return 0;
 }
 
+static int perf_counter_read_size(struct perf_counter *counter)
+{
+        int entry = sizeof(u64); /* value */
+        int size = 0;
+        int nr = 1;
+
+        if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+                size += sizeof(u64);
+
+        if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+                size += sizeof(u64);
+
+        if (counter->attr.read_format & PERF_FORMAT_ID)
+                entry += sizeof(u64);
+
+        if (counter->attr.read_format & PERF_FORMAT_GROUP) {
+                nr += counter->group_leader->nr_siblings;
+                size += sizeof(u64);
+        }
+
+        size += entry * nr;
+
+        return size;
+}
+
+static u64 perf_counter_read_value(struct perf_counter *counter)
+{
+        struct perf_counter *child;
+        u64 total = 0;
+
+        total += perf_counter_read(counter);
+        list_for_each_entry(child, &counter->child_list, child_list)
+                total += perf_counter_read(child);
+
+        return total;
+}
+
+static int perf_counter_read_entry(struct perf_counter *counter,
+                                   u64 read_format, char __user *buf)
+{
+        int n = 0, count = 0;
+        u64 values[2];
+
+        values[n++] = perf_counter_read_value(counter);
+        if (read_format & PERF_FORMAT_ID)
+                values[n++] = primary_counter_id(counter);
+
+        count = n * sizeof(u64);
+
+        if (copy_to_user(buf, values, count))
+                return -EFAULT;
+
+        return count;
+}
+
+static int perf_counter_read_group(struct perf_counter *counter,
+                                   u64 read_format, char __user *buf)
+{
+        struct perf_counter *leader = counter->group_leader, *sub;
+        int n = 0, size = 0, err = -EFAULT;
+        u64 values[3];
+
+        values[n++] = 1 + leader->nr_siblings;
+        if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
+                values[n++] = leader->total_time_enabled +
+                        atomic64_read(&leader->child_total_time_enabled);
+        }
+        if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
+                values[n++] = leader->total_time_running +
+                        atomic64_read(&leader->child_total_time_running);
+        }
+
+        size = n * sizeof(u64);
+
+        if (copy_to_user(buf, values, size))
+                return -EFAULT;
+
+        err = perf_counter_read_entry(leader, read_format, buf + size);
+        if (err < 0)
+                return err;
+
+        size += err;
+
+        list_for_each_entry(sub, &leader->sibling_list, list_entry) {
+                err = perf_counter_read_entry(counter, read_format,
+                                buf + size);
+                if (err < 0)
+                        return err;
+
+                size += err;
+        }
+
+        return size;
+}
+
+static int perf_counter_read_one(struct perf_counter *counter,
+                                 u64 read_format, char __user *buf)
+{
+        u64 values[4];
+        int n = 0;
+
+        values[n++] = perf_counter_read_value(counter);
+        if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
+                values[n++] = counter->total_time_enabled +
+                        atomic64_read(&counter->child_total_time_enabled);
+        }
+        if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
+                values[n++] = counter->total_time_running +
+                        atomic64_read(&counter->child_total_time_running);
+        }
+        if (read_format & PERF_FORMAT_ID)
+                values[n++] = primary_counter_id(counter);
+
+        if (copy_to_user(buf, values, n * sizeof(u64)))
+                return -EFAULT;
+
+        return n * sizeof(u64);
+}
+
 /*
  * 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;
+        u64 read_format = counter->attr.read_format;
+        int ret;
 
         /*
          * Return end-of-file for a read on a counter that is in
@@ -1705,28 +1832,18 @@ perf_read_hw(struct perf_counter *counter, char __user *buf, size_t count)
         if (counter->state == PERF_COUNTER_STATE_ERROR)
                 return 0;
 
+        if (count < perf_counter_read_size(counter))
+                return -ENOSPC;
+
         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++] = primary_counter_id(counter);
+        if (read_format & PERF_FORMAT_GROUP)
+                ret = perf_counter_read_group(counter, read_format, buf);
+        else
+                ret = perf_counter_read_one(counter, read_format, buf);
         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;
+        return ret;
 }
 
 static ssize_t
@@ -2230,7 +2347,7 @@ static void perf_pending_counter(struct perf_pending_entry *entry)
 
         if (counter->pending_disable) {
                 counter->pending_disable = 0;
-                perf_counter_disable(counter);
+                __perf_counter_disable(counter);
         }
 
         if (counter->pending_wakeup) {
@@ -2615,7 +2732,80 @@ static u32 perf_counter_tid(struct perf_counter *counter, struct task_struct *p)
         return task_pid_nr_ns(p, counter->ns);
 }
 
-static void perf_counter_output(struct perf_counter *counter, int nmi,
+static void perf_output_read_one(struct perf_output_handle *handle,
+                                 struct perf_counter *counter)
+{
+        u64 read_format = counter->attr.read_format;
+        u64 values[4];
+        int n = 0;
+
+        values[n++] = atomic64_read(&counter->count);
+        if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
+                values[n++] = counter->total_time_enabled +
+                        atomic64_read(&counter->child_total_time_enabled);
+        }
+        if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
+                values[n++] = counter->total_time_running +
+                        atomic64_read(&counter->child_total_time_running);
+        }
+        if (read_format & PERF_FORMAT_ID)
+                values[n++] = primary_counter_id(counter);
+
+        perf_output_copy(handle, values, n * sizeof(u64));
+}
+
+/*
+ * XXX PERF_FORMAT_GROUP vs inherited counters seems difficult.
+ */
+static void perf_output_read_group(struct perf_output_handle *handle,
+                            struct perf_counter *counter)
+{
+        struct perf_counter *leader = counter->group_leader, *sub;
+        u64 read_format = counter->attr.read_format;
+        u64 values[5];
+        int n = 0;
+
+        values[n++] = 1 + leader->nr_siblings;
+
+        if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+                values[n++] = leader->total_time_enabled;
+
+        if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+                values[n++] = leader->total_time_running;
+
+        if (leader != counter)
+                leader->pmu->read(leader);
+
+        values[n++] = atomic64_read(&leader->count);
+        if (read_format & PERF_FORMAT_ID)
+                values[n++] = primary_counter_id(leader);
+
+        perf_output_copy(handle, values, n * sizeof(u64));
+
+        list_for_each_entry(sub, &leader->sibling_list, list_entry) {
+                n = 0;
+
+                if (sub != counter)
+                        sub->pmu->read(sub);
+
+                values[n++] = atomic64_read(&sub->count);
+                if (read_format & PERF_FORMAT_ID)
+                        values[n++] = primary_counter_id(sub);
+
+                perf_output_copy(handle, values, n * sizeof(u64));
+        }
+}
+
+static void perf_output_read(struct perf_output_handle *handle,
+                             struct perf_counter *counter)
+{
+        if (counter->attr.read_format & PERF_FORMAT_GROUP)
+                perf_output_read_group(handle, counter);
+        else
+                perf_output_read_one(handle, counter);
+}
+
+void perf_counter_output(struct perf_counter *counter, int nmi,
                                 struct perf_sample_data *data)
 {
         int ret;
@@ -2626,10 +2816,6 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
         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;
@@ -2684,10 +2870,8 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
         if (sample_type & PERF_SAMPLE_PERIOD)
                 header.size += sizeof(u64);
 
-        if (sample_type & PERF_SAMPLE_GROUP) {
-                header.size += sizeof(u64) +
-                        counter->nr_siblings * sizeof(group_entry);
-        }
+        if (sample_type & PERF_SAMPLE_READ)
+                header.size += perf_counter_read_size(counter);
 
         if (sample_type & PERF_SAMPLE_CALLCHAIN) {
                 callchain = perf_callchain(data->regs);
@@ -2699,6 +2883,18 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
                         header.size += sizeof(u64);
         }
 
+        if (sample_type & PERF_SAMPLE_RAW) {
+                int size = sizeof(u32);
+
+                if (data->raw)
+                        size += data->raw->size;
+                else
+                        size += sizeof(u32);
+
+                WARN_ON_ONCE(size & (sizeof(u64)-1));
+                header.size += size;
+        }
+
         ret = perf_output_begin(&handle, counter, header.size, nmi, 1);
         if (ret)
                 return;
@@ -2732,26 +2928,8 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
         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 = primary_counter_id(sub);
-                        group_entry.counter = atomic64_read(&sub->count);
-
-                        perf_output_put(&handle, group_entry);
-                }
-        }
+        if (sample_type & PERF_SAMPLE_READ)
+                perf_output_read(&handle, counter);
 
         if (sample_type & PERF_SAMPLE_CALLCHAIN) {
                 if (callchain)
@@ -2762,6 +2940,22 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
                 }
         }
 
+        if (sample_type & PERF_SAMPLE_RAW) {
+                if (data->raw) {
+                        perf_output_put(&handle, data->raw->size);
+                        perf_output_copy(&handle, data->raw->data, data->raw->size);
+                } else {
+                        struct {
+                                u32     size;
+                                u32     data;
+                        } raw = {
+                                .size = sizeof(u32),
+                                .data = 0,
+                        };
+                        perf_output_put(&handle, raw);
+                }
+        }
+
         perf_output_end(&handle);
 }
 
@@ -2774,8 +2968,6 @@ struct perf_read_event {
 
         u32                             pid;
         u32                             tid;
-        u64                             value;
-        u64                             format[3];
 };
 
 static void
@@ -2787,80 +2979,74 @@ perf_counter_read_event(struct perf_counter *counter,
                 .header = {
                         .type = PERF_EVENT_READ,
                         .misc = 0,
-                        .size = sizeof(event) - sizeof(event.format),
+                        .size = sizeof(event) + perf_counter_read_size(counter),
                 },
                 .pid = perf_counter_pid(counter, task),
                 .tid = perf_counter_tid(counter, task),
-                .value = atomic64_read(&counter->count),
         };
-        int ret, i = 0;
-
-        if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
-                event.header.size += sizeof(u64);
-                event.format[i++] = counter->total_time_enabled;
-        }
-
-        if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
-                event.header.size += sizeof(u64);
-                event.format[i++] = counter->total_time_running;
-        }
-
-        if (counter->attr.read_format & PERF_FORMAT_ID) {
-                event.header.size += sizeof(u64);
-                event.format[i++] = primary_counter_id(counter);
-        }
+        int ret;
 
         ret = perf_output_begin(&handle, counter, event.header.size, 0, 0);
         if (ret)
                 return;
 
-        perf_output_copy(&handle, &event, event.header.size);
+        perf_output_put(&handle, event);
+        perf_output_read(&handle, counter);
+
         perf_output_end(&handle);
 }
 
 /*
- * fork tracking
+ * task tracking -- fork/exit
+ *
+ * enabled by: attr.comm | attr.mmap | attr.task
  */
 
-struct perf_fork_event {
-        struct task_struct      *task;
+struct perf_task_event {
+        struct task_struct              *task;
+        struct perf_counter_context     *task_ctx;
 
         struct {
                 struct perf_event_header        header;
 
                 u32                             pid;
                 u32                             ppid;
+                u32                             tid;
+                u32                             ptid;
         } event;
 };
 
-static void perf_counter_fork_output(struct perf_counter *counter,
-                                     struct perf_fork_event *fork_event)
+static void perf_counter_task_output(struct perf_counter *counter,
+                                     struct perf_task_event *task_event)
 {
         struct perf_output_handle handle;
-        int size = fork_event->event.header.size;
-        struct task_struct *task = fork_event->task;
+        int size = task_event->event.header.size;
+        struct task_struct *task = task_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);
+        task_event->event.pid = perf_counter_pid(counter, task);
+        task_event->event.ppid = perf_counter_pid(counter, current);
+
+        task_event->event.tid = perf_counter_tid(counter, task);
+        task_event->event.ptid = perf_counter_tid(counter, current);
 
-        perf_output_put(&handle, fork_event->event);
+        perf_output_put(&handle, task_event->event);
         perf_output_end(&handle);
 }
 
-static int perf_counter_fork_match(struct perf_counter *counter)
+static int perf_counter_task_match(struct perf_counter *counter)
 {
-        if (counter->attr.comm || counter->attr.mmap)
+        if (counter->attr.comm || counter->attr.mmap || counter->attr.task)
                 return 1;
 
         return 0;
 }
 
-static void perf_counter_fork_ctx(struct perf_counter_context *ctx,
-                                  struct perf_fork_event *fork_event)
+static void perf_counter_task_ctx(struct perf_counter_context *ctx,
+                                  struct perf_task_event *task_event)
 {
         struct perf_counter *counter;
 
@@ -2869,54 +3055,62 @@ static void perf_counter_fork_ctx(struct perf_counter_context *ctx,
 
         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);
+                if (perf_counter_task_match(counter))
+                        perf_counter_task_output(counter, task_event);
         }
         rcu_read_unlock();
 }
 
-static void perf_counter_fork_event(struct perf_fork_event *fork_event)
+static void perf_counter_task_event(struct perf_task_event *task_event)
 {
         struct perf_cpu_context *cpuctx;
-        struct perf_counter_context *ctx;
+        struct perf_counter_context *ctx = task_event->task_ctx;
 
         cpuctx = &get_cpu_var(perf_cpu_context);
-        perf_counter_fork_ctx(&cpuctx->ctx, fork_event);
+        perf_counter_task_ctx(&cpuctx->ctx, task_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)
+                ctx = rcu_dereference(task_event->task->perf_counter_ctxp);
         if (ctx)
-                perf_counter_fork_ctx(ctx, fork_event);
+                perf_counter_task_ctx(ctx, task_event);
         rcu_read_unlock();
 }
 
-void perf_counter_fork(struct task_struct *task)
+static void perf_counter_task(struct task_struct *task,
+                              struct perf_counter_context *task_ctx,
+                              int new)
 {
-        struct perf_fork_event fork_event;
+        struct perf_task_event task_event;
 
         if (!atomic_read(&nr_comm_counters) &&
-            !atomic_read(&nr_mmap_counters))
+            !atomic_read(&nr_mmap_counters) &&
+            !atomic_read(&nr_task_counters))
                 return;
 
-        fork_event = (struct perf_fork_event){
-                .task   = task,
-                .event  = {
+        task_event = (struct perf_task_event){
+                .task     = task,
+                .task_ctx = task_ctx,
+                .event    = {
                         .header = {
-                                .type = PERF_EVENT_FORK,
+                                .type = new ? PERF_EVENT_FORK : PERF_EVENT_EXIT,
                                 .misc = 0,
-                                .size = sizeof(fork_event.event),
+                                .size = sizeof(task_event.event),
                         },
                         /* .pid  */
                         /* .ppid */
+                        /* .tid  */
+                        /* .ptid */
                 },
         };
 
-        perf_counter_fork_event(&fork_event);
+        perf_counter_task_event(&task_event);
+}
+
+void perf_counter_fork(struct task_struct *task)
+{
+        perf_counter_task(task, NULL, 1);
 }
 
 /*
@@ -3305,125 +3499,111 @@ int perf_counter_overflow(struct perf_counter *counter, int nmi,
  * Generic software counter infrastructure
  */
 
-static void perf_swcounter_update(struct perf_counter *counter)
+/*
+ * We directly increment counter->count and keep a second value in
+ * counter->hw.period_left to count intervals. This period counter
+ * is kept in the range [-sample_period, 0] so that we can use the
+ * sign as trigger.
+ */
+
+static u64 perf_swcounter_set_period(struct perf_counter *counter)
 {
         struct hw_perf_counter *hwc = &counter->hw;
-        u64 prev, now;
-        s64 delta;
+        u64 period = hwc->last_period;
+        u64 nr, offset;
+        s64 old, val;
+
+        hwc->last_period = hwc->sample_period;
 
 again:
-        prev = atomic64_read(&hwc->prev_count);
-        now = atomic64_read(&hwc->count);
-        if (atomic64_cmpxchg(&hwc->prev_count, prev, now) != prev)
-                goto again;
+        old = val = atomic64_read(&hwc->period_left);
+        if (val < 0)
+                return 0;
 
-        delta = now - prev;
+        nr = div64_u64(period + val, period);
+        offset = nr * period;
+        val -= offset;
+        if (atomic64_cmpxchg(&hwc->period_left, old, val) != old)
+                goto again;
 
-        atomic64_add(delta, &counter->count);
-        atomic64_sub(delta, &hwc->period_left);
+        return nr;
 }
 
-static void perf_swcounter_set_period(struct perf_counter *counter)
+static void perf_swcounter_overflow(struct perf_counter *counter,
+                                    int nmi, struct perf_sample_data *data)
 {
         struct hw_perf_counter *hwc = &counter->hw;
-        s64 left = atomic64_read(&hwc->period_left);
-        s64 period = hwc->sample_period;
+        u64 overflow;
 
-        if (unlikely(left <= -period)) {
-                left = period;
-                atomic64_set(&hwc->period_left, left);
-                hwc->last_period = period;
-        }
+        data->period = counter->hw.last_period;
+        overflow = perf_swcounter_set_period(counter);
 
-        if (unlikely(left <= 0)) {
-                left += period;
-                atomic64_add(period, &hwc->period_left);
-                hwc->last_period = period;
-        }
+        if (hwc->interrupts == MAX_INTERRUPTS)
+                return;
 
-        atomic64_set(&hwc->prev_count, -left);
-        atomic64_set(&hwc->count, -left);
+        for (; overflow; overflow--) {
+                if (perf_counter_overflow(counter, nmi, data)) {
+                        /*
+                         * We inhibit the overflow from happening when
+                         * hwc->interrupts == MAX_INTERRUPTS.
+                         */
+                        break;
+                }
+        }
 }
 
-static enum hrtimer_restart perf_swcounter_hrtimer(struct hrtimer *hrtimer)
+static void perf_swcounter_unthrottle(struct perf_counter *counter)
 {
-        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.
+         * Nothing to do, we already reset hwc->interrupts.
          */
-        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;
-        }
+static void perf_swcounter_add(struct perf_counter *counter, u64 nr,
+                               int nmi, struct perf_sample_data *data)
+{
+        struct hw_perf_counter *hwc = &counter->hw;
 
-        period = max_t(u64, 10000, counter->hw.sample_period);
-        hrtimer_forward_now(hrtimer, ns_to_ktime(period));
+        atomic64_add(nr, &counter->count);
 
-        return ret;
-}
+        if (!hwc->sample_period)
+                return;
 
-static void perf_swcounter_overflow(struct perf_counter *counter,
-                                    int nmi, struct perf_sample_data *data)
-{
-        data->period = counter->hw.last_period;
+        if (!data->regs)
+                return;
 
-        perf_swcounter_update(counter);
-        perf_swcounter_set_period(counter);
-        if (perf_counter_overflow(counter, nmi, data))
-                /* soft-disable the counter */
-                ;
+        if (!atomic64_add_negative(nr, &hwc->period_left))
+                perf_swcounter_overflow(counter, nmi, data);
 }
 
 static int perf_swcounter_is_counting(struct perf_counter *counter)
 {
-        struct perf_counter_context *ctx;
-        unsigned long flags;
-        int count;
-
+        /*
+         * The counter is active, we're good!
+         */
         if (counter->state == PERF_COUNTER_STATE_ACTIVE)
                 return 1;
 
+        /*
+         * The counter is off/error, not counting.
+         */
         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.
+         * The counter is inactive, if the context is active
+         * we're part of a group that didn't make it on the 'pmu',
+         * not counting.
          */
-        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;
+        if (counter->ctx->is_active)
+                return 0;
+
+        /*
+         * We're inactive and the context is too, this means the
+         * task is scheduled out, we're counting events that happen
+         * to us, like migration events.
+         */
+        return 1;
 }
 
 static int perf_swcounter_match(struct perf_counter *counter,
@@ -3449,15 +3629,6 @@ static int perf_swcounter_match(struct perf_counter *counter,
         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,
@@ -3536,27 +3707,66 @@ void __perf_swcounter_event(u32 event, u64 nr, int nmi,
 
 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);
+        struct hw_perf_counter *hwc = &counter->hw;
+
+        if (hwc->sample_period) {
+                hwc->last_period = hwc->sample_period;
+                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,
+        .unthrottle     = perf_swcounter_unthrottle,
 };
 
 /*
+ * hrtimer based swcounter callback
+ */
+
+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;
+}
+
+/*
  * Software counter: cpu wall time clock
  */
 
@@ -3673,17 +3883,24 @@ static const struct pmu perf_ops_task_clock = {
 };
 
 #ifdef CONFIG_EVENT_PROFILE
-void perf_tpcounter_event(int event_id)
+void perf_tpcounter_event(int event_id, u64 addr, u64 count, void *record,
+                          int entry_size)
 {
+        struct perf_raw_record raw = {
+                .size = entry_size,
+                .data = record,
+        };
+
         struct perf_sample_data data = {
                 .regs = get_irq_regs(),
-                .addr = 0,
+                .addr = addr,
+                .raw = &raw,
         };
 
         if (!data.regs)
                 data.regs = task_pt_regs(current);
 
-        do_perf_swcounter_event(PERF_TYPE_TRACEPOINT, event_id, 1, 1, &data);
+        do_perf_swcounter_event(PERF_TYPE_TRACEPOINT, event_id, count, 1, &data);
 }
 EXPORT_SYMBOL_GPL(perf_tpcounter_event);
 
@@ -3697,6 +3914,14 @@ static void tp_perf_counter_destroy(struct perf_counter *counter)
 
 static const struct pmu *tp_perf_counter_init(struct perf_counter *counter)
 {
+        /*
+         * Raw tracepoint data is a severe data leak, only allow root to
+         * have these.
+         */
+        if ((counter->attr.sample_type & PERF_SAMPLE_RAW) &&
+                        !capable(CAP_SYS_ADMIN))
+                return ERR_PTR(-EPERM);
+
         if (ftrace_profile_enable(counter->attr.config))
                 return NULL;
 
@@ -3830,9 +4055,9 @@ perf_counter_alloc(struct perf_counter_attr *attr,
         atomic64_set(&hwc->period_left, hwc->sample_period);
 
         /*
-         * we currently do not support PERF_SAMPLE_GROUP on inherited counters
+         * we currently do not support PERF_FORMAT_GROUP on inherited counters
          */
-        if (attr->inherit && (attr->sample_type & PERF_SAMPLE_GROUP))
+        if (attr->inherit && (attr->read_format & PERF_FORMAT_GROUP))
                 goto done;
 
         switch (attr->type) {
@@ -3875,6 +4100,8 @@ done:
                         atomic_inc(&nr_mmap_counters);
                 if (counter->attr.comm)
                         atomic_inc(&nr_comm_counters);
+                if (counter->attr.task)
+                        atomic_inc(&nr_task_counters);
         }
 
         return counter;
@@ -4236,8 +4463,10 @@ void perf_counter_exit_task(struct task_struct *child)
         struct perf_counter_context *child_ctx;
         unsigned long flags;
 
-        if (likely(!child->perf_counter_ctxp))
+        if (likely(!child->perf_counter_ctxp)) {
+                perf_counter_task(child, NULL, 0);
                 return;
+        }
 
         local_irq_save(flags);
         /*
@@ -4262,8 +4491,14 @@ void perf_counter_exit_task(struct task_struct *child)
          * the counters from it.
          */
         unclone_ctx(child_ctx);
-        spin_unlock(&child_ctx->lock);
-        local_irq_restore(flags);
+        spin_unlock_irqrestore(&child_ctx->lock, flags);
+
+        /*
+         * Report the task dead after unscheduling the counters so that we
+         * won't get any samples after PERF_EVENT_EXIT. We can however still
+         * get a few PERF_EVENT_READ events.
+         */
+        perf_counter_task(child, child_ctx, 0);
 
         /*
          * We can recurse on the same lock type through:
@@ -4484,6 +4719,11 @@ perf_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
                 perf_counter_init_cpu(cpu);
                 break;
 
+        case CPU_ONLINE:
+        case CPU_ONLINE_FROZEN:
+                hw_perf_counter_setup_online(cpu);
+                break;
+
         case CPU_DOWN_PREPARE:
         case CPU_DOWN_PREPARE_FROZEN:
                 perf_counter_exit_cpu(cpu);
@@ -4508,6 +4748,8 @@ void __init perf_counter_init(void)
 {
         perf_cpu_notify(&perf_cpu_nb, (unsigned long)CPU_UP_PREPARE,
                         (void *)(long)smp_processor_id());
+        perf_cpu_notify(&perf_cpu_nb, (unsigned long)CPU_ONLINE,
+                        (void *)(long)smp_processor_id());
         register_cpu_notifier(&perf_cpu_nb);
 }
 
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index bece7c0b67b2..e33a21cb9407 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -521,11 +521,12 @@ void posix_cpu_timers_exit(struct task_struct *tsk)
 }
 void posix_cpu_timers_exit_group(struct task_struct *tsk)
 {
-        struct task_cputime cputime;
+        struct signal_struct *const sig = tsk->signal;
 
-        thread_group_cputimer(tsk, &cputime);
         cleanup_timers(tsk->signal->cpu_timers,
-                       cputime.utime, cputime.stime, cputime.sum_exec_runtime);
+                       cputime_add(tsk->utime, sig->utime),
+                       cputime_add(tsk->stime, sig->stime),
+                       tsk->se.sum_exec_runtime + sig->sum_sched_runtime);
 }
 
 static void clear_dead_task(struct k_itimer *timer, union cpu_time_count now)
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 052ec4d195c7..d089d052c4a9 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -202,6 +202,12 @@ static int no_timer_create(struct k_itimer *new_timer)
         return -EOPNOTSUPP;
 }
 
+static int no_nsleep(const clockid_t which_clock, int flags,
+                     struct timespec *tsave, struct timespec __user *rmtp)
+{
+        return -EOPNOTSUPP;
+}
+
 /*
  * Return nonzero if we know a priori this clockid_t value is bogus.
  */
@@ -254,6 +260,7 @@ static __init int init_posix_timers(void)
                 .clock_get = posix_get_monotonic_raw,
                 .clock_set = do_posix_clock_nosettime,
                 .timer_create = no_timer_create,
+                .nsleep = no_nsleep,
         };
 
         register_posix_clock(CLOCK_REALTIME, &clock_realtime);
diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index fcd107a78c5a..29bd4baf9e75 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -1039,16 +1039,14 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *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);
-
+                spin_unlock(&lock->wait_lock);
                 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
diff --git a/kernel/sched_cpupri.c b/kernel/sched_cpupri.c
index e6c251790dde..d014efbf947a 100644
--- a/kernel/sched_cpupri.c
+++ b/kernel/sched_cpupri.c
@@ -81,8 +81,21 @@ int cpupri_find(struct cpupri *cp, struct task_struct *p,
                 if (cpumask_any_and(&p->cpus_allowed, vec->mask) >= nr_cpu_ids)
                         continue;
 
-                if (lowest_mask)
+                if (lowest_mask) {
                         cpumask_and(lowest_mask, &p->cpus_allowed, vec->mask);
+
+                        /*
+                         * We have to ensure that we have at least one bit
+                         * still set in the array, since the map could have
+                         * been concurrently emptied between the first and
+                         * second reads of vec->mask.  If we hit this
+                         * condition, simply act as though we never hit this
+                         * priority level and continue on.
+                         */
+                        if (cpumask_any(lowest_mask) >= nr_cpu_ids)
+                                continue;
+                }
+
                 return 1;
         }
 
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 9ffb2b2ceba4..652e8bdef9aa 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -611,9 +611,13 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
 static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
 #ifdef CONFIG_SCHEDSTATS
+        struct task_struct *tsk = NULL;
+
+        if (entity_is_task(se))
+                tsk = task_of(se);
+
         if (se->sleep_start) {
                 u64 delta = rq_of(cfs_rq)->clock - se->sleep_start;
-                struct task_struct *tsk = task_of(se);
 
                 if ((s64)delta < 0)
                         delta = 0;
@@ -624,11 +628,11 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
                 se->sleep_start = 0;
                 se->sum_sleep_runtime += delta;
 
-                account_scheduler_latency(tsk, delta >> 10, 1);
+                if (tsk)
+                        account_scheduler_latency(tsk, delta >> 10, 1);
         }
         if (se->block_start) {
                 u64 delta = rq_of(cfs_rq)->clock - se->block_start;
-                struct task_struct *tsk = task_of(se);
 
                 if ((s64)delta < 0)
                         delta = 0;
@@ -639,17 +643,19 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
                 se->block_start = 0;
                 se->sum_sleep_runtime += delta;
 
-                /*
-                 * Blocking time is in units of nanosecs, so shift by 20 to
-                 * get a milliseconds-range estimation of the amount of
-                 * time that the task spent sleeping:
-                 */
-                if (unlikely(prof_on == SLEEP_PROFILING)) {
-
-                        profile_hits(SLEEP_PROFILING, (void *)get_wchan(tsk),
-                                     delta >> 20);
+                if (tsk) {
+                        /*
+                         * Blocking time is in units of nanosecs, so shift by
+                         * 20 to get a milliseconds-range estimation of the
+                         * amount of time that the task spent sleeping:
+                         */
+                        if (unlikely(prof_on == SLEEP_PROFILING)) {
+                                profile_hits(SLEEP_PROFILING,
+                                                (void *)get_wchan(tsk),
+                                                delta >> 20);
+                        }
+                        account_scheduler_latency(tsk, delta >> 10, 0);
                 }
-                account_scheduler_latency(tsk, delta >> 10, 0);
         }
 #endif
 }
diff --git a/kernel/signal.c b/kernel/signal.c
index ccf1ceedaebe..64c5deeaca5d 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2454,11 +2454,9 @@ do_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, unsigned long s
         stack_t oss;
         int error;
 
-        if (uoss) {
-                oss.ss_sp = (void __user *) current->sas_ss_sp;
-                oss.ss_size = current->sas_ss_size;
-                oss.ss_flags = sas_ss_flags(sp);
-        }
+        oss.ss_sp = (void __user *) current->sas_ss_sp;
+        oss.ss_size = current->sas_ss_size;
+        oss.ss_flags = sas_ss_flags(sp);
 
         if (uss) {
                 void __user *ss_sp;
@@ -2466,10 +2464,12 @@ do_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, unsigned long s
                 int ss_flags;
 
                 error = -EFAULT;
-                if (!access_ok(VERIFY_READ, uss, sizeof(*uss))
-                    || __get_user(ss_sp, &uss->ss_sp)
-                    || __get_user(ss_flags, &uss->ss_flags)
-                    || __get_user(ss_size, &uss->ss_size))
+                if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
+                        goto out;
+                error = __get_user(ss_sp, &uss->ss_sp) |
+                        __get_user(ss_flags, &uss->ss_flags) |
+                        __get_user(ss_size, &uss->ss_size);
+                if (error)
                         goto out;
 
                 error = -EPERM;
@@ -2501,13 +2501,16 @@ do_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, unsigned long s
                 current->sas_ss_size = ss_size;
         }
 
+        error = 0;
         if (uoss) {
                 error = -EFAULT;
-                if (copy_to_user(uoss, &oss, sizeof(oss)))
+                if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
                         goto out;
+                error = __put_user(oss.ss_sp, &uoss->ss_sp) |
+                        __put_user(oss.ss_size, &uoss->ss_size) |
+                        __put_user(oss.ss_flags, &uoss->ss_flags);
         }
 
-        error = 0;
 out:
         return error;
 }
diff --git a/kernel/smp.c b/kernel/smp.c
index ad63d8501207..94188b8ecc33 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -57,7 +57,7 @@ hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
                         return NOTIFY_BAD;
                 break;
 
-#ifdef CONFIG_CPU_HOTPLUG
+#ifdef CONFIG_HOTPLUG_CPU
         case CPU_UP_CANCELED:
         case CPU_UP_CANCELED_FROZEN:
 
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 1090b0aed9ba..7a34cb563fec 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -267,8 +267,8 @@ 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);
+        debugfs_remove(bt->dir);
         free_percpu(bt->sequence);
         free_percpu(bt->msg_data);
         kfree(bt);
@@ -378,18 +378,8 @@ static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf,
 
 static int blk_remove_buf_file_callback(struct dentry *dentry)
 {
-        struct dentry *parent = dentry->d_parent;
         debugfs_remove(dentry);
 
-        /*
-        * this will fail for all but the last file, but that is ok. what we
-        * care about is the top level buts->name directory going away, when
-        * the last trace file is gone. Then we don't have to rmdir() that
-        * manually on trace stop, so it nicely solves the issue with
-        * force killing of running traces.
-        */
-
-        debugfs_remove(parent);
         return 0;
 }
 
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 4521c77d1a1a..1e1d23c26308 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1662,7 +1662,7 @@ ftrace_regex_open(struct inode *inode, struct file *file, int enable)
 
         mutex_lock(&ftrace_regex_lock);
         if ((file->f_mode & FMODE_WRITE) &&
-            !(file->f_flags & O_APPEND))
+            (file->f_flags & O_TRUNC))
                 ftrace_filter_reset(enable);
 
         if (file->f_mode & FMODE_READ) {
@@ -2577,7 +2577,7 @@ ftrace_graph_open(struct inode *inode, struct file *file)
 
         mutex_lock(&graph_lock);
         if ((file->f_mode & FMODE_WRITE) &&
-            !(file->f_flags & O_APPEND)) {
+            (file->f_flags & O_TRUNC)) {
                 ftrace_graph_count = 0;
                 memset(ftrace_graph_funcs, 0, sizeof(ftrace_graph_funcs));
         }
@@ -2596,6 +2596,14 @@ ftrace_graph_open(struct inode *inode, struct file *file)
 }
 
 static int
+ftrace_graph_release(struct inode *inode, struct file *file)
+{
+        if (file->f_mode & FMODE_READ)
+                seq_release(inode, file);
+        return 0;
+}
+
+static int
 ftrace_set_func(unsigned long *array, int *idx, char *buffer)
 {
         struct dyn_ftrace *rec;
@@ -2724,9 +2732,10 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
 }
 
 static const struct file_operations ftrace_graph_fops = {
-        .open = ftrace_graph_open,
-        .read = seq_read,
-        .write = ftrace_graph_write,
+        .open           = ftrace_graph_open,
+        .read           = seq_read,
+        .write          = ftrace_graph_write,
+        .release        = ftrace_graph_release,
 };
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index bf27bb7a63e2..a330513d96ce 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -735,6 +735,7 @@ ring_buffer_free(struct ring_buffer *buffer)
 
         put_online_cpus();
 
+        kfree(buffer->buffers);
         free_cpumask_var(buffer->cpumask);
 
         kfree(buffer);
@@ -1785,7 +1786,7 @@ void ring_buffer_discard_commit(struct ring_buffer *buffer,
          */
         RB_WARN_ON(buffer, !local_read(&cpu_buffer->committing));
 
-        if (!rb_try_to_discard(cpu_buffer, event))
+        if (rb_try_to_discard(cpu_buffer, event))
                 goto out;
 
         /*
@@ -2383,7 +2384,6 @@ rb_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
                  * the box. Return the padding, and we will release
                  * the current locks, and try again.
                  */
-                rb_advance_reader(cpu_buffer);
                 return event;
 
         case RINGBUF_TYPE_TIME_EXTEND:
@@ -2486,7 +2486,7 @@ static inline int rb_ok_to_lock(void)
          * 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))
+        if (likely(!in_nmi()))
                 return 1;
 
         tracing_off_permanent();
@@ -2519,6 +2519,8 @@ ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
         if (dolock)
                 spin_lock(&cpu_buffer->reader_lock);
         event = rb_buffer_peek(buffer, cpu, ts);
+        if (event && event->type_len == RINGBUF_TYPE_PADDING)
+                rb_advance_reader(cpu_buffer);
         if (dolock)
                 spin_unlock(&cpu_buffer->reader_lock);
         local_irq_restore(flags);
@@ -2590,12 +2592,9 @@ ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)
                 spin_lock(&cpu_buffer->reader_lock);
 
         event = rb_buffer_peek(buffer, cpu, ts);
-        if (!event)
-                goto out_unlock;
-
-        rb_advance_reader(cpu_buffer);
+        if (event)
+                rb_advance_reader(cpu_buffer);
 
- out_unlock:
         if (dolock)
                 spin_unlock(&cpu_buffer->reader_lock);
         local_irq_restore(flags);
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8bc8d8afea6a..c22b40f8f576 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -848,6 +848,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
                 ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) |
                 (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0);
 }
+EXPORT_SYMBOL_GPL(tracing_generic_entry_update);
 
 struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr,
                                                     int type,
@@ -2031,7 +2032,7 @@ static int tracing_open(struct inode *inode, struct file *file)
 
         /* If this file was open for write, then erase contents */
         if ((file->f_mode & FMODE_WRITE) &&
-            !(file->f_flags & O_APPEND)) {
+            (file->f_flags & O_TRUNC)) {
                 long cpu = (long) inode->i_private;
 
                 if (cpu == TRACE_PIPE_ALL_CPU)
@@ -3085,7 +3086,8 @@ tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter)
                         break;
                 }
 
-                trace_consume(iter);
+                if (ret != TRACE_TYPE_NO_CONSUME)
+                        trace_consume(iter);
                 rem -= count;
                 if (!find_next_entry_inc(iter)) {
                         rem = 0;
@@ -4233,8 +4235,11 @@ static void __ftrace_dump(bool disable_tracing)
                 iter.pos = -1;
 
                 if (find_next_entry_inc(&iter) != NULL) {
-                        print_trace_line(&iter);
-                        trace_consume(&iter);
+                        int ret;
+
+                        ret = print_trace_line(&iter);
+                        if (ret != TRACE_TYPE_NO_CONSUME)
+                                trace_consume(&iter);
                 }
 
                 trace_printk_seq(&iter.seq);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 3548ae5cc780..8b9f4f6e9559 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -438,10 +438,6 @@ struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
                                           int *ent_cpu, u64 *ent_ts);
 
-void tracing_generic_entry_update(struct trace_entry *entry,
-                                  unsigned long flags,
-                                  int pc);
-
 void default_wait_pipe(struct trace_iterator *iter);
 void poll_wait_pipe(struct trace_iterator *iter);
 
diff --git a/kernel/trace/trace_event_profile.c b/kernel/trace/trace_event_profile.c
index 5b5895afecfe..11ba5bb4ed0a 100644
--- a/kernel/trace/trace_event_profile.c
+++ b/kernel/trace/trace_event_profile.c
@@ -14,7 +14,7 @@ int ftrace_profile_enable(int event_id)
 
         mutex_lock(&event_mutex);
         list_for_each_entry(event, &ftrace_events, list) {
-                if (event->id == event_id) {
+                if (event->id == event_id && event->profile_enable) {
                         ret = event->profile_enable(event);
                         break;
                 }
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 53c8fd376a88..e75276a49cf5 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -376,7 +376,7 @@ ftrace_event_seq_open(struct inode *inode, struct file *file)
         const struct seq_operations *seq_ops;
 
         if ((file->f_mode & FMODE_WRITE) &&
-            !(file->f_flags & O_APPEND))
+            (file->f_flags & O_TRUNC))
                 ftrace_clear_events();
 
         seq_ops = inode->i_private;
@@ -940,7 +940,7 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
                 entry = trace_create_file("enable", 0644, call->dir, call,
                                           enable);
 
-        if (call->id)
+        if (call->id && call->profile_enable)
                 entry = trace_create_file("id", 0444, call->dir, call,
                                           id);
 
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 936c621bbf46..f32dc9d1ea7b 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -624,9 +624,6 @@ static int filter_add_subsystem_pred(struct filter_parse_state *ps,
                 return -ENOSPC;
         }
 
-        filter->preds[filter->n_preds] = pred;
-        filter->n_preds++;
-
         list_for_each_entry(call, &ftrace_events, list) {
 
                 if (!call->define_fields)
@@ -643,6 +640,9 @@ static int filter_add_subsystem_pred(struct filter_parse_state *ps,
                 }
                 replace_filter_string(call->filter, filter_string);
         }
+
+        filter->preds[filter->n_preds] = pred;
+        filter->n_preds++;
 out:
         return err;
 }
@@ -1029,12 +1029,17 @@ static int replace_preds(struct event_subsystem *system,
 
                 if (elt->op == OP_AND || elt->op == OP_OR) {
                         pred = create_logical_pred(elt->op);
+                        if (!pred)
+                                return -ENOMEM;
                         if (call) {
                                 err = filter_add_pred(ps, call, pred);
                                 filter_free_pred(pred);
-                        } else
+                        } else {
                                 err = filter_add_subsystem_pred(ps, system,
                                                         pred, filter_string);
+                                if (err)
+                                        filter_free_pred(pred);
+                        }
                         if (err)
                                 return err;
 
@@ -1048,12 +1053,17 @@ static int replace_preds(struct event_subsystem *system,
                 }
 
                 pred = create_pred(elt->op, operand1, operand2);
+                if (!pred)
+                        return -ENOMEM;
                 if (call) {
                         err = filter_add_pred(ps, call, pred);
                         filter_free_pred(pred);
-                } else
+                } else {
                         err = filter_add_subsystem_pred(ps, system, pred,
                                                         filter_string);
+                        if (err)
+                                filter_free_pred(pred);
+                }
                 if (err)
                         return err;
 
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index d2249abafb53..420ec3487579 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -843,9 +843,16 @@ print_graph_function(struct trace_iterator *iter)
 
         switch (entry->type) {
         case TRACE_GRAPH_ENT: {
-                struct ftrace_graph_ent_entry *field;
+                /*
+                 * print_graph_entry() may consume the current event,
+                 * thus @field may become invalid, so we need to save it.
+                 * sizeof(struct ftrace_graph_ent_entry) is very small,
+                 * it can be safely saved at the stack.
+                 */
+                struct ftrace_graph_ent_entry *field, saved;
                 trace_assign_type(field, entry);
-                return print_graph_entry(field, s, iter);
+                saved = *field;
+                return print_graph_entry(&saved, s, iter);
         }
         case TRACE_GRAPH_RET: {
                 struct ftrace_graph_ret_entry *field;
diff --git a/kernel/trace/trace_printk.c b/kernel/trace/trace_printk.c
index 7b6278110827..687699d365ae 100644
--- a/kernel/trace/trace_printk.c
+++ b/kernel/trace/trace_printk.c
@@ -176,7 +176,7 @@ static int t_show(struct seq_file *m, void *v)
         const char *str = *fmt;
         int i;
 
-        seq_printf(m, "0x%lx : \"", (unsigned long)fmt);
+        seq_printf(m, "0x%lx : \"", *(unsigned long *)fmt);
 
         /*
          * Tabs and new lines need to be converted.
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index e644af910124..6a2a9d484cd6 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -301,17 +301,14 @@ static const struct seq_operations stack_trace_seq_ops = {
 
 static int stack_trace_open(struct inode *inode, struct file *file)
 {
-        int ret;
-
-        ret = seq_open(file, &stack_trace_seq_ops);
-
-        return ret;
+        return seq_open(file, &stack_trace_seq_ops);
 }
 
 static const struct file_operations stack_trace_fops = {
         .open           = stack_trace_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
+        .release        = seq_release,
 };
 
 int
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index e66f5e493342..aea321c82fa0 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -73,7 +73,7 @@ static struct rb_node *release_next(struct rb_node *node)
         }
 }
 
-static void reset_stat_session(struct stat_session *session)
+static void __reset_stat_session(struct stat_session *session)
 {
         struct rb_node *node = session->stat_root.rb_node;
 
@@ -83,10 +83,17 @@ static void reset_stat_session(struct stat_session *session)
         session->stat_root = RB_ROOT;
 }
 
+static void reset_stat_session(struct stat_session *session)
+{
+        mutex_lock(&session->stat_mutex);
+        __reset_stat_session(session);
+        mutex_unlock(&session->stat_mutex);
+}
+
 static void destroy_session(struct stat_session *session)
 {
         debugfs_remove(session->file);
-        reset_stat_session(session);
+        __reset_stat_session(session);
         mutex_destroy(&session->stat_mutex);
         kfree(session);
 }
@@ -150,7 +157,7 @@ static int stat_seq_init(struct stat_session *session)
         int i;
 
         mutex_lock(&session->stat_mutex);
-        reset_stat_session(session);
+        __reset_stat_session(session);
 
         if (!ts->stat_cmp)
                 ts->stat_cmp = dummy_cmp;
@@ -183,7 +190,7 @@ exit:
         return ret;
 
 exit_free_rbtree:
-        reset_stat_session(session);
+        __reset_stat_session(session);
         mutex_unlock(&session->stat_mutex);
         return ret;
 }
@@ -250,16 +257,21 @@ static const struct seq_operations trace_stat_seq_ops = {
 static int tracing_stat_open(struct inode *inode, struct file *file)
 {
         int ret;
-
+        struct seq_file *m;
         struct stat_session *session = inode->i_private;
 
+        ret = stat_seq_init(session);
+        if (ret)
+                return ret;
+
         ret = seq_open(file, &trace_stat_seq_ops);
-        if (!ret) {
-                struct seq_file *m = file->private_data;
-                m->private = session;
-                ret = stat_seq_init(session);
+        if (ret) {
+                reset_stat_session(session);
+                return ret;
         }
 
+        m = file->private_data;
+        m->private = session;
         return ret;
 }
 
@@ -270,11 +282,9 @@ static int tracing_stat_release(struct inode *i, struct file *f)
 {
         struct stat_session *session = i->i_private;
 
-        mutex_lock(&session->stat_mutex);
         reset_stat_session(session);
-        mutex_unlock(&session->stat_mutex);
 
-        return 0;
+        return seq_release(i, f);
 }
 
 static const struct file_operations tracing_stat_fops = {
diff --git a/kernel/wait.c b/kernel/wait.c
index ea7c3b4275cf..c4bd3d825f35 100644
--- a/kernel/wait.c
+++ b/kernel/wait.c
@@ -10,13 +10,14 @@
 #include <linux/wait.h>
 #include <linux/hash.h>
 
-void init_waitqueue_head(wait_queue_head_t *q)
+void __init_waitqueue_head(wait_queue_head_t *q, struct lock_class_key *key)
 {
         spin_lock_init(&q->lock);
+        lockdep_set_class(&q->lock, key);
         INIT_LIST_HEAD(&q->task_list);
 }
 
-EXPORT_SYMBOL(init_waitqueue_head);
+EXPORT_SYMBOL(__init_waitqueue_head);
 
 void add_wait_queue(wait_queue_head_t *q, wait_queue_t *wait)
 {