Merge branch 'master' of git+ssh://git.samba.org/data/git/sfrench/cifs-2.6

27 files changed, 458 insertions, 89 deletions

diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 5e828a2ca8e6..213c0351dad8 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -153,6 +153,13 @@ static void freezer_destroy(struct cgroup_subsys *ss,
         kfree(cgroup_freezer(cgroup));
 }
 
+/* task is frozen or will freeze immediately when next it gets woken */
+static bool is_task_frozen_enough(struct task_struct *task)
+{
+        return frozen(task) ||
+                (task_is_stopped_or_traced(task) && freezing(task));
+}
+
 /*
  * The call to cgroup_lock() in the freezer.state write method prevents
  * a write to that file racing against an attach, and hence the
@@ -231,7 +238,7 @@ static void update_if_frozen(struct cgroup *cgroup,
         cgroup_iter_start(cgroup, &it);
         while ((task = cgroup_iter_next(cgroup, &it))) {
                 ntotal++;
-                if (frozen(task))
+                if (is_task_frozen_enough(task))
                         nfrozen++;
         }
 
@@ -284,7 +291,7 @@ static int try_to_freeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
         while ((task = cgroup_iter_next(cgroup, &it))) {
                 if (!freeze_task(task, true))
                         continue;
-                if (frozen(task))
+                if (is_task_frozen_enough(task))
                         continue;
                 if (!freezing(task) && !freezer_should_skip(task))
                         num_cant_freeze_now++;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 0e8457da6f95..d3b9df5962c2 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -185,6 +185,9 @@ static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
 static void update_context_time(struct perf_event_context *ctx);
 static u64 perf_event_time(struct perf_event *event);
 
+static void ring_buffer_attach(struct perf_event *event,
+                               struct ring_buffer *rb);
+
 void __weak perf_event_print_debug(void)        { }
 
 extern __weak const char *perf_pmu_name(void)
@@ -2171,9 +2174,10 @@ static void perf_event_context_sched_in(struct perf_event_context *ctx,
          */
         cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
 
-        perf_event_sched_in(cpuctx, ctx, task);
+        if (ctx->nr_events)
+                cpuctx->task_ctx = ctx;
 
-        cpuctx->task_ctx = ctx;
+        perf_event_sched_in(cpuctx, cpuctx->task_ctx, task);
 
         perf_pmu_enable(ctx->pmu);
         perf_ctx_unlock(cpuctx, ctx);
@@ -3190,12 +3194,33 @@ static unsigned int perf_poll(struct file *file, poll_table *wait)
         struct ring_buffer *rb;
         unsigned int events = POLL_HUP;
 
+        /*
+         * Race between perf_event_set_output() and perf_poll(): perf_poll()
+         * grabs the rb reference but perf_event_set_output() overrides it.
+         * Here is the timeline for two threads T1, T2:
+         * t0: T1, rb = rcu_dereference(event->rb)
+         * t1: T2, old_rb = event->rb
+         * t2: T2, event->rb = new rb
+         * t3: T2, ring_buffer_detach(old_rb)
+         * t4: T1, ring_buffer_attach(rb1)
+         * t5: T1, poll_wait(event->waitq)
+         *
+         * To avoid this problem, we grab mmap_mutex in perf_poll()
+         * thereby ensuring that the assignment of the new ring buffer
+         * and the detachment of the old buffer appear atomic to perf_poll()
+         */
+        mutex_lock(&event->mmap_mutex);
+
         rcu_read_lock();
         rb = rcu_dereference(event->rb);
-        if (rb)
+        if (rb) {
+                ring_buffer_attach(event, rb);
                 events = atomic_xchg(&rb->poll, 0);
+        }
         rcu_read_unlock();
 
+        mutex_unlock(&event->mmap_mutex);
+
         poll_wait(file, &event->waitq, wait);
 
         return events;
@@ -3496,6 +3521,49 @@ unlock:
         return ret;
 }
 
+static void ring_buffer_attach(struct perf_event *event,
+                               struct ring_buffer *rb)
+{
+        unsigned long flags;
+
+        if (!list_empty(&event->rb_entry))
+                return;
+
+        spin_lock_irqsave(&rb->event_lock, flags);
+        if (!list_empty(&event->rb_entry))
+                goto unlock;
+
+        list_add(&event->rb_entry, &rb->event_list);
+unlock:
+        spin_unlock_irqrestore(&rb->event_lock, flags);
+}
+
+static void ring_buffer_detach(struct perf_event *event,
+                               struct ring_buffer *rb)
+{
+        unsigned long flags;
+
+        if (list_empty(&event->rb_entry))
+                return;
+
+        spin_lock_irqsave(&rb->event_lock, flags);
+        list_del_init(&event->rb_entry);
+        wake_up_all(&event->waitq);
+        spin_unlock_irqrestore(&rb->event_lock, flags);
+}
+
+static void ring_buffer_wakeup(struct perf_event *event)
+{
+        struct ring_buffer *rb;
+
+        rcu_read_lock();
+        rb = rcu_dereference(event->rb);
+        list_for_each_entry_rcu(event, &rb->event_list, rb_entry) {
+                wake_up_all(&event->waitq);
+        }
+        rcu_read_unlock();
+}
+
 static void rb_free_rcu(struct rcu_head *rcu_head)
 {
         struct ring_buffer *rb;
@@ -3521,9 +3589,19 @@ static struct ring_buffer *ring_buffer_get(struct perf_event *event)
 
 static void ring_buffer_put(struct ring_buffer *rb)
 {
+        struct perf_event *event, *n;
+        unsigned long flags;
+
         if (!atomic_dec_and_test(&rb->refcount))
                 return;
 
+        spin_lock_irqsave(&rb->event_lock, flags);
+        list_for_each_entry_safe(event, n, &rb->event_list, rb_entry) {
+                list_del_init(&event->rb_entry);
+                wake_up_all(&event->waitq);
+        }
+        spin_unlock_irqrestore(&rb->event_lock, flags);
+
         call_rcu(&rb->rcu_head, rb_free_rcu);
 }
 
@@ -3546,6 +3624,7 @@ static void perf_mmap_close(struct vm_area_struct *vma)
                 atomic_long_sub((size >> PAGE_SHIFT) + 1, &user->locked_vm);
                 vma->vm_mm->pinned_vm -= event->mmap_locked;
                 rcu_assign_pointer(event->rb, NULL);
+                ring_buffer_detach(event, rb);
                 mutex_unlock(&event->mmap_mutex);
 
                 ring_buffer_put(rb);
@@ -3700,7 +3779,7 @@ static const struct file_operations perf_fops = {
 
 void perf_event_wakeup(struct perf_event *event)
 {
-        wake_up_all(&event->waitq);
+        ring_buffer_wakeup(event);
 
         if (event->pending_kill) {
                 kill_fasync(&event->fasync, SIGIO, event->pending_kill);
@@ -5822,6 +5901,8 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
         INIT_LIST_HEAD(&event->group_entry);
         INIT_LIST_HEAD(&event->event_entry);
         INIT_LIST_HEAD(&event->sibling_list);
+        INIT_LIST_HEAD(&event->rb_entry);
+
         init_waitqueue_head(&event->waitq);
         init_irq_work(&event->pending, perf_pending_event);
 
@@ -6028,6 +6109,8 @@ set:
 
         old_rb = event->rb;
         rcu_assign_pointer(event->rb, rb);
+        if (old_rb)
+                ring_buffer_detach(event, old_rb);
         ret = 0;
 unlock:
         mutex_unlock(&event->mmap_mutex);
diff --git a/kernel/events/internal.h b/kernel/events/internal.h
index 09097dd8116c..64568a699375 100644
--- a/kernel/events/internal.h
+++ b/kernel/events/internal.h
@@ -22,6 +22,9 @@ struct ring_buffer {
         local_t                         lost;           /* nr records lost   */
 
         long                            watermark;      /* wakeup watermark  */
+        /* poll crap */
+        spinlock_t                      event_lock;
+        struct list_head                event_list;
 
         struct perf_event_mmap_page     *user_page;
         void                            *data_pages[0];
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index a2a29205cc0f..7f3011c6b57f 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -209,6 +209,9 @@ ring_buffer_init(struct ring_buffer *rb, long watermark, int flags)
                 rb->writable = 1;
 
         atomic_set(&rb->refcount, 1);
+
+        INIT_LIST_HEAD(&rb->event_list);
+        spin_lock_init(&rb->event_lock);
 }
 
 #ifndef CONFIG_PERF_USE_VMALLOC
diff --git a/kernel/fork.c b/kernel/fork.c
index ba0d17261329..da4a6a10d088 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -162,7 +162,6 @@ static void account_kernel_stack(struct thread_info *ti, int account)
 
 void free_task(struct task_struct *tsk)
 {
-        prop_local_destroy_single(&tsk->dirties);
         account_kernel_stack(tsk->stack, -1);
         free_thread_info(tsk->stack);
         rt_mutex_debug_task_free(tsk);
@@ -274,10 +273,6 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
 
         tsk->stack = ti;
 
-        err = prop_local_init_single(&tsk->dirties);
-        if (err)
-                goto out;
-
         setup_thread_stack(tsk, orig);
         clear_user_return_notifier(tsk);
         clear_tsk_need_resched(tsk);
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 422e567eecf6..ae34bf51682b 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -885,10 +885,13 @@ static void __remove_hrtimer(struct hrtimer *timer,
                              struct hrtimer_clock_base *base,
                              unsigned long newstate, int reprogram)
 {
+        struct timerqueue_node *next_timer;
         if (!(timer->state & HRTIMER_STATE_ENQUEUED))
                 goto out;
 
-        if (&timer->node == timerqueue_getnext(&base->active)) {
+        next_timer = timerqueue_getnext(&base->active);
+        timerqueue_del(&base->active, &timer->node);
+        if (&timer->node == next_timer) {
 #ifdef CONFIG_HIGH_RES_TIMERS
                 /* Reprogram the clock event device. if enabled */
                 if (reprogram && hrtimer_hres_active()) {
@@ -901,7 +904,6 @@ static void __remove_hrtimer(struct hrtimer *timer,
                 }
 #endif
         }
-        timerqueue_del(&base->active, &timer->node);
         if (!timerqueue_getnext(&base->active))
                 base->cpu_base->active_bases &= ~(1 << base->index);
 out:
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 67ce837ae52c..1da999f5e746 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -623,8 +623,9 @@ static irqreturn_t irq_nested_primary_handler(int irq, void *dev_id)
 
 static int irq_wait_for_interrupt(struct irqaction *action)
 {
+        set_current_state(TASK_INTERRUPTIBLE);
+
         while (!kthread_should_stop()) {
-                set_current_state(TASK_INTERRUPTIBLE);
 
                 if (test_and_clear_bit(IRQTF_RUNTHREAD,
                                        &action->thread_flags)) {
@@ -632,7 +633,9 @@ static int irq_wait_for_interrupt(struct irqaction *action)
                         return 0;
                 }
                 schedule();
+                set_current_state(TASK_INTERRUPTIBLE);
         }
+        __set_current_state(TASK_RUNNING);
         return -1;
 }
 
@@ -1596,7 +1599,7 @@ int request_percpu_irq(unsigned int irq, irq_handler_t handler,
                 return -ENOMEM;
 
         action->handler = handler;
-        action->flags = IRQF_PERCPU;
+        action->flags = IRQF_PERCPU | IRQF_NO_SUSPEND;
         action->name = devname;
         action->percpu_dev_id = dev_id;
 
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index aa57d5da18c1..dc813a948be2 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -84,7 +84,9 @@ static int try_one_irq(int irq, struct irq_desc *desc, bool force)
          */
         action = desc->action;
         if (!action || !(action->flags & IRQF_SHARED) ||
-            (action->flags & __IRQF_TIMER) || !action->next)
+            (action->flags & __IRQF_TIMER) ||
+            (action->handler(irq, action->dev_id) == IRQ_HANDLED) ||
+            !action->next)
                 goto out;
 
         /* Already running on another processor */
@@ -115,7 +117,7 @@ static int misrouted_irq(int irq)
         struct irq_desc *desc;
         int i, ok = 0;
 
-        if (atomic_inc_return(&irq_poll_active) == 1)
+        if (atomic_inc_return(&irq_poll_active) != 1)
                 goto out;
 
         irq_poll_cpu = smp_processor_id();
diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index bbdfe2a462a0..66ff7109f697 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -66,8 +66,9 @@ void jump_label_inc(struct jump_label_key *key)
                 return;
 
         jump_label_lock();
-        if (atomic_add_return(1, &key->enabled) == 1)
+        if (atomic_read(&key->enabled) == 0)
                 jump_label_update(key, JUMP_LABEL_ENABLE);
+        atomic_inc(&key->enabled);
         jump_label_unlock();
 }
 
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index e69434b070da..b2e08c932d91 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -44,6 +44,7 @@
 #include <linux/stringify.h>
 #include <linux/bitops.h>
 #include <linux/gfp.h>
+#include <linux/kmemcheck.h>
 
 #include <asm/sections.h>
 
@@ -2948,7 +2949,12 @@ static int mark_lock(struct task_struct *curr, struct held_lock *this,
 void lockdep_init_map(struct lockdep_map *lock, const char *name,
                       struct lock_class_key *key, int subclass)
 {
-        memset(lock, 0, sizeof(*lock));
+        int i;
+
+        kmemcheck_mark_initialized(lock, sizeof(*lock));
+
+        for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++)
+                lock->class_cache[i] = NULL;
 
 #ifdef CONFIG_LOCK_STAT
         lock->cpu = raw_smp_processor_id();
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index b4511b6d3ef9..a6b0503574ee 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -55,6 +55,8 @@ enum {
 
 static int hibernation_mode = HIBERNATION_SHUTDOWN;
 
+static bool freezer_test_done;
+
 static const struct platform_hibernation_ops *hibernation_ops;
 
 /**
@@ -345,11 +347,24 @@ int hibernation_snapshot(int platform_mode)
 
         error = freeze_kernel_threads();
         if (error)
-                goto Close;
+                goto Cleanup;
+
+        if (hibernation_test(TEST_FREEZER) ||
+                hibernation_testmode(HIBERNATION_TESTPROC)) {
+
+                /*
+                 * Indicate to the caller that we are returning due to a
+                 * successful freezer test.
+                 */
+                freezer_test_done = true;
+                goto Cleanup;
+        }
 
         error = dpm_prepare(PMSG_FREEZE);
-        if (error)
-                goto Complete_devices;
+        if (error) {
+                dpm_complete(msg);
+                goto Cleanup;
+        }
 
         suspend_console();
         pm_restrict_gfp_mask();
@@ -378,8 +393,6 @@ int hibernation_snapshot(int platform_mode)
                 pm_restore_gfp_mask();
 
         resume_console();
-
- Complete_devices:
         dpm_complete(msg);
 
  Close:
@@ -389,6 +402,10 @@ int hibernation_snapshot(int platform_mode)
  Recover_platform:
         platform_recover(platform_mode);
         goto Resume_devices;
+
+ Cleanup:
+        swsusp_free();
+        goto Close;
 }
 
 /**
@@ -641,15 +658,13 @@ int hibernate(void)
         if (error)
                 goto Finish;
 
-        if (hibernation_test(TEST_FREEZER))
-                goto Thaw;
-
-        if (hibernation_testmode(HIBERNATION_TESTPROC))
-                goto Thaw;
-
         error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
         if (error)
                 goto Thaw;
+        if (freezer_test_done) {
+                freezer_test_done = false;
+                goto Thaw;
+        }
 
         if (in_suspend) {
                 unsigned int flags = 0;
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 71f49fe4377e..36e0f0903c32 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -290,13 +290,14 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
                 if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
                         break;
         }
-        if (state < PM_SUSPEND_MAX && *s)
+        if (state < PM_SUSPEND_MAX && *s) {
                 error = enter_state(state);
                 if (error) {
                         suspend_stats.fail++;
                         dpm_save_failed_errno(error);
                 } else
                         suspend_stats.success++;
+        }
 #endif
 
  Exit:
diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 56db75147186..995e3bd3417b 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -70,6 +70,7 @@ static struct pm_qos_constraints cpu_dma_constraints = {
 };
 static struct pm_qos_object cpu_dma_pm_qos = {
         .constraints = &cpu_dma_constraints,
+        .name = "cpu_dma_latency",
 };
 
 static BLOCKING_NOTIFIER_HEAD(network_lat_notifier);
diff --git a/kernel/printk.c b/kernel/printk.c
index 1455a0d4eedd..7982a0a841ea 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1293,10 +1293,11 @@ again:
         raw_spin_lock(&logbuf_lock);
         if (con_start != log_end)
                 retry = 1;
+        raw_spin_unlock_irqrestore(&logbuf_lock, flags);
+
         if (retry && console_trylock())
                 goto again;
 
-        raw_spin_unlock_irqrestore(&logbuf_lock, flags);
         if (wake_klogd)
                 wake_up_klogd();
 }
diff --git a/kernel/sched.c b/kernel/sched.c
index 0e9344a71be3..d6b149ccf925 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -71,6 +71,7 @@
 #include <linux/ctype.h>
 #include <linux/ftrace.h>
 #include <linux/slab.h>
+#include <linux/init_task.h>
 
 #include <asm/tlb.h>
 #include <asm/irq_regs.h>
@@ -4810,6 +4811,9 @@ EXPORT_SYMBOL(wait_for_completion);
  * This waits for either a completion of a specific task to be signaled or for a
  * specified timeout to expire. The timeout is in jiffies. It is not
  * interruptible.
+ *
+ * The return value is 0 if timed out, and positive (at least 1, or number of
+ * jiffies left till timeout) if completed.
  */
 unsigned long __sched
 wait_for_completion_timeout(struct completion *x, unsigned long timeout)
@@ -4824,6 +4828,8 @@ EXPORT_SYMBOL(wait_for_completion_timeout);
  *
  * This waits for completion of a specific task to be signaled. It is
  * interruptible.
+ *
+ * The return value is -ERESTARTSYS if interrupted, 0 if completed.
  */
 int __sched wait_for_completion_interruptible(struct completion *x)
 {
@@ -4841,6 +4847,9 @@ EXPORT_SYMBOL(wait_for_completion_interruptible);
  *
  * This waits for either a completion of a specific task to be signaled or for a
  * specified timeout to expire. It is interruptible. The timeout is in jiffies.
+ *
+ * The return value is -ERESTARTSYS if interrupted, 0 if timed out,
+ * positive (at least 1, or number of jiffies left till timeout) if completed.
  */
 long __sched
 wait_for_completion_interruptible_timeout(struct completion *x,
@@ -4856,6 +4865,8 @@ EXPORT_SYMBOL(wait_for_completion_interruptible_timeout);
  *
  * This waits to be signaled for completion of a specific task. It can be
  * interrupted by a kill signal.
+ *
+ * The return value is -ERESTARTSYS if interrupted, 0 if completed.
  */
 int __sched wait_for_completion_killable(struct completion *x)
 {
@@ -4874,6 +4885,9 @@ EXPORT_SYMBOL(wait_for_completion_killable);
  * This waits for either a completion of a specific task to be
  * signaled or for a specified timeout to expire. It can be
  * interrupted by a kill signal. The timeout is in jiffies.
+ *
+ * The return value is -ERESTARTSYS if interrupted, 0 if timed out,
+ * positive (at least 1, or number of jiffies left till timeout) if completed.
  */
 long __sched
 wait_for_completion_killable_timeout(struct completion *x,
@@ -6099,6 +6113,9 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
          */
         idle->sched_class = &idle_sched_class;
         ftrace_graph_init_idle_task(idle, cpu);
+#if defined(CONFIG_SMP)
+        sprintf(idle->comm, "%s/%d", INIT_TASK_COMM, cpu);
+#endif
 }
 
 /*
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 5c9e67923b7c..a78ed2736ba7 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -772,19 +772,32 @@ static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update)
                 list_del_leaf_cfs_rq(cfs_rq);
 }
 
+static inline long calc_tg_weight(struct task_group *tg, struct cfs_rq *cfs_rq)
+{
+        long tg_weight;
+
+        /*
+         * Use this CPU's actual weight instead of the last load_contribution
+         * to gain a more accurate current total weight. See
+         * update_cfs_rq_load_contribution().
+         */
+        tg_weight = atomic_read(&tg->load_weight);
+        tg_weight -= cfs_rq->load_contribution;
+        tg_weight += cfs_rq->load.weight;
+
+        return tg_weight;
+}
+
 static long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg)
 {
-        long load_weight, load, shares;
+        long tg_weight, load, shares;
 
+        tg_weight = calc_tg_weight(tg, cfs_rq);
         load = cfs_rq->load.weight;
 
-        load_weight = atomic_read(&tg->load_weight);
-        load_weight += load;
-        load_weight -= cfs_rq->load_contribution;
-
         shares = (tg->shares * load);
-        if (load_weight)
-                shares /= load_weight;
+        if (tg_weight)
+                shares /= tg_weight;
 
         if (shares < MIN_SHARES)
                 shares = MIN_SHARES;
@@ -1743,7 +1756,7 @@ static void __return_cfs_rq_runtime(struct cfs_rq *cfs_rq)
 
 static __always_inline void return_cfs_rq_runtime(struct cfs_rq *cfs_rq)
 {
-        if (!cfs_rq->runtime_enabled || !cfs_rq->nr_running)
+        if (!cfs_rq->runtime_enabled || cfs_rq->nr_running)
                 return;
 
         __return_cfs_rq_runtime(cfs_rq);
@@ -2036,36 +2049,100 @@ static void task_waking_fair(struct task_struct *p)
  * Adding load to a group doesn't make a group heavier, but can cause movement
  * of group shares between cpus. Assuming the shares were perfectly aligned one
  * can calculate the shift in shares.
+ *
+ * Calculate the effective load difference if @wl is added (subtracted) to @tg
+ * on this @cpu and results in a total addition (subtraction) of @wg to the
+ * total group weight.
+ *
+ * Given a runqueue weight distribution (rw_i) we can compute a shares
+ * distribution (s_i) using:
+ *
+ *   s_i = rw_i / \Sum rw_j                                             (1)
+ *
+ * Suppose we have 4 CPUs and our @tg is a direct child of the root group and
+ * has 7 equal weight tasks, distributed as below (rw_i), with the resulting
+ * shares distribution (s_i):
+ *
+ *   rw_i = {   2,   4,   1,   0 }
+ *   s_i  = { 2/7, 4/7, 1/7,   0 }
+ *
+ * As per wake_affine() we're interested in the load of two CPUs (the CPU the
+ * task used to run on and the CPU the waker is running on), we need to
+ * compute the effect of waking a task on either CPU and, in case of a sync
+ * wakeup, compute the effect of the current task going to sleep.
+ *
+ * So for a change of @wl to the local @cpu with an overall group weight change
+ * of @wl we can compute the new shares distribution (s'_i) using:
+ *
+ *   s'_i = (rw_i + @wl) / (@wg + \Sum rw_j)                            (2)
+ *
+ * Suppose we're interested in CPUs 0 and 1, and want to compute the load
+ * differences in waking a task to CPU 0. The additional task changes the
+ * weight and shares distributions like:
+ *
+ *   rw'_i = {   3,   4,   1,   0 }
+ *   s'_i  = { 3/8, 4/8, 1/8,   0 }
+ *
+ * We can then compute the difference in effective weight by using:
+ *
+ *   dw_i = S * (s'_i - s_i)                                            (3)
+ *
+ * Where 'S' is the group weight as seen by its parent.
+ *
+ * Therefore the effective change in loads on CPU 0 would be 5/56 (3/8 - 2/7)
+ * times the weight of the group. The effect on CPU 1 would be -4/56 (4/8 -
+ * 4/7) times the weight of the group.
  */
 static long effective_load(struct task_group *tg, int cpu, long wl, long wg)
 {
         struct sched_entity *se = tg->se[cpu];
 
-        if (!tg->parent)
+        if (!tg->parent)        /* the trivial, non-cgroup case */
                 return wl;
 
         for_each_sched_entity(se) {
-                long lw, w;
+                long w, W;
 
                 tg = se->my_q->tg;
-                w = se->my_q->load.weight;
 
-                /* use this cpu's instantaneous contribution */
-                lw = atomic_read(&tg->load_weight);
-                lw -= se->my_q->load_contribution;
-                lw += w + wg;
+                /*
+                 * W = @wg + \Sum rw_j
+                 */
+                W = wg + calc_tg_weight(tg, se->my_q);
 
-                wl += w;
+                /*
+                 * w = rw_i + @wl
+                 */
+                w = se->my_q->load.weight + wl;
 
-                if (lw > 0 && wl < lw)
-                        wl = (wl * tg->shares) / lw;
+                /*
+                 * wl = S * s'_i; see (2)
+                 */
+                if (W > 0 && w < W)
+                        wl = (w * tg->shares) / W;
                 else
                         wl = tg->shares;
 
-                /* zero point is MIN_SHARES */
+                /*
+                 * Per the above, wl is the new se->load.weight value; since
+                 * those are clipped to [MIN_SHARES, ...) do so now. See
+                 * calc_cfs_shares().
+                 */
                 if (wl < MIN_SHARES)
                         wl = MIN_SHARES;
+
+                /*
+                 * wl = dw_i = S * (s'_i - s_i); see (3)
+                 */
                 wl -= se->load.weight;
+
+                /*
+                 * Recursively apply this logic to all parent groups to compute
+                 * the final effective load change on the root group. Since
+                 * only the @tg group gets extra weight, all parent groups can
+                 * only redistribute existing shares. @wl is the shift in shares
+                 * resulting from this level per the above.
+                 */
                 wg = 0;
         }
 
@@ -2249,7 +2326,8 @@ static int select_idle_sibling(struct task_struct *p, int target)
         int cpu = smp_processor_id();
         int prev_cpu = task_cpu(p);
         struct sched_domain *sd;
-        int i;
+        struct sched_group *sg;
+        int i, smt = 0;
 
         /*
          * If the task is going to be woken-up on this cpu and if it is
@@ -2269,25 +2347,38 @@ static int select_idle_sibling(struct task_struct *p, int target)
          * Otherwise, iterate the domains and find an elegible idle cpu.
          */
         rcu_read_lock();
+again:
         for_each_domain(target, sd) {
-                if (!(sd->flags & SD_SHARE_PKG_RESOURCES))
-                        break;
+                if (!smt && (sd->flags & SD_SHARE_CPUPOWER))
+                        continue;
 
-                for_each_cpu_and(i, sched_domain_span(sd), tsk_cpus_allowed(p)) {
-                        if (idle_cpu(i)) {
-                                target = i;
-                                break;
+                if (!(sd->flags & SD_SHARE_PKG_RESOURCES)) {
+                        if (!smt) {
+                                smt = 1;
+                                goto again;
                         }
+                        break;
                 }
 
-                /*
-                 * Lets stop looking for an idle sibling when we reached
-                 * the domain that spans the current cpu and prev_cpu.
-                 */
-                if (cpumask_test_cpu(cpu, sched_domain_span(sd)) &&
-                    cpumask_test_cpu(prev_cpu, sched_domain_span(sd)))
-                        break;
+                sg = sd->groups;
+                do {
+                        if (!cpumask_intersects(sched_group_cpus(sg),
+                                                tsk_cpus_allowed(p)))
+                                goto next;
+
+                        for_each_cpu(i, sched_group_cpus(sg)) {
+                                if (!idle_cpu(i))
+                                        goto next;
+                        }
+
+                        target = cpumask_first_and(sched_group_cpus(sg),
+                                        tsk_cpus_allowed(p));
+                        goto done;
+next:
+                        sg = sg->next;
+                } while (sg != sd->groups);
         }
+done:
         rcu_read_unlock();
 
         return target;
@@ -3511,7 +3602,7 @@ static bool update_sd_pick_busiest(struct sched_domain *sd,
 }
 
 /**
- * update_sd_lb_stats - Update sched_group's statistics for load balancing.
+ * update_sd_lb_stats - Update sched_domain's statistics for load balancing.
  * @sd: sched_domain whose statistics are to be updated.
  * @this_cpu: Cpu for which load balance is currently performed.
  * @idle: Idle status of this_cpu
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index efa0a7b75dde..84802245abd2 100644
--- a/kernel/sched_features.h
+++ b/kernel/sched_features.h
@@ -67,3 +67,4 @@ SCHED_FEAT(NONTASK_POWER, 1)
 SCHED_FEAT(TTWU_QUEUE, 1)
 
 SCHED_FEAT(FORCE_SD_OVERLAP, 0)
+SCHED_FEAT(RT_RUNTIME_SHARE, 1)
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 056cbd2e2a27..583a1368afe6 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -560,6 +560,9 @@ static int balance_runtime(struct rt_rq *rt_rq)
 {
         int more = 0;
 
+        if (!sched_feat(RT_RUNTIME_SHARE))
+                return more;
+
         if (rt_rq->rt_time > rt_rq->rt_runtime) {
                 raw_spin_unlock(&rt_rq->rt_runtime_lock);
                 more = do_balance_runtime(rt_rq);
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index c436e790b21b..8a46f5d64504 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -195,7 +195,7 @@ static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer)
                 struct alarm *alarm;
                 ktime_t expired = next->expires;
 
-                if (expired.tv64 >= now.tv64)
+                if (expired.tv64 > now.tv64)
                         break;
 
                 alarm = container_of(next, struct alarm, node);
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 1ecd6ba36d6c..c4eb71c8b2ea 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -387,6 +387,7 @@ void clockevents_exchange_device(struct clock_event_device *old,
          * released list and do a notify add later.
          */
         if (old) {
+                old->event_handler = clockevents_handle_noop;
                 clockevents_set_mode(old, CLOCK_EVT_MODE_UNUSED);
                 list_del(&old->list);
                 list_add(&old->list, &clockevents_released);
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index cf52fda2e096..da2f760e780c 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -492,6 +492,22 @@ void clocksource_touch_watchdog(void)
 }
 
 /**
+ * clocksource_max_adjustment- Returns max adjustment amount
+ * @cs:         Pointer to clocksource
+ *
+ */
+static u32 clocksource_max_adjustment(struct clocksource *cs)
+{
+        u64 ret;
+        /*
+         * We won't try to correct for more then 11% adjustments (110,000 ppm),
+         */
+        ret = (u64)cs->mult * 11;
+        do_div(ret,100);
+        return (u32)ret;
+}
+
+/**
  * clocksource_max_deferment - Returns max time the clocksource can be deferred
  * @cs:         Pointer to clocksource
  *
@@ -503,25 +519,28 @@ static u64 clocksource_max_deferment(struct clocksource *cs)
         /*
          * Calculate the maximum number of cycles that we can pass to the
          * cyc2ns function without overflowing a 64-bit signed result. The
-         * maximum number of cycles is equal to ULLONG_MAX/cs->mult which
-         * is equivalent to the below.
-         * max_cycles < (2^63)/cs->mult
-         * max_cycles < 2^(log2((2^63)/cs->mult))
-         * max_cycles < 2^(log2(2^63) - log2(cs->mult))
-         * max_cycles < 2^(63 - log2(cs->mult))
-         * max_cycles < 1 << (63 - log2(cs->mult))
+         * maximum number of cycles is equal to ULLONG_MAX/(cs->mult+cs->maxadj)
+         * which is equivalent to the below.
+         * max_cycles < (2^63)/(cs->mult + cs->maxadj)
+         * max_cycles < 2^(log2((2^63)/(cs->mult + cs->maxadj)))
+         * max_cycles < 2^(log2(2^63) - log2(cs->mult + cs->maxadj))
+         * max_cycles < 2^(63 - log2(cs->mult + cs->maxadj))
+         * max_cycles < 1 << (63 - log2(cs->mult + cs->maxadj))
          * Please note that we add 1 to the result of the log2 to account for
          * any rounding errors, ensure the above inequality is satisfied and
          * no overflow will occur.
          */
-        max_cycles = 1ULL << (63 - (ilog2(cs->mult) + 1));
+        max_cycles = 1ULL << (63 - (ilog2(cs->mult + cs->maxadj) + 1));
 
         /*
          * The actual maximum number of cycles we can defer the clocksource is
          * determined by the minimum of max_cycles and cs->mask.
+         * Note: Here we subtract the maxadj to make sure we don't sleep for
+         * too long if there's a large negative adjustment.
          */
         max_cycles = min_t(u64, max_cycles, (u64) cs->mask);
-        max_nsecs = clocksource_cyc2ns(max_cycles, cs->mult, cs->shift);
+        max_nsecs = clocksource_cyc2ns(max_cycles, cs->mult - cs->maxadj,
+                                        cs->shift);
 
         /*
          * To ensure that the clocksource does not wrap whilst we are idle,
@@ -529,7 +548,7 @@ static u64 clocksource_max_deferment(struct clocksource *cs)
          * note a margin of 12.5% is used because this can be computed with
          * a shift, versus say 10% which would require division.
          */
-        return max_nsecs - (max_nsecs >> 5);
+        return max_nsecs - (max_nsecs >> 3);
 }
 
 #ifndef CONFIG_ARCH_USES_GETTIMEOFFSET
@@ -640,7 +659,6 @@ static void clocksource_enqueue(struct clocksource *cs)
 void __clocksource_updatefreq_scale(struct clocksource *cs, u32 scale, u32 freq)
 {
         u64 sec;
-
         /*
          * Calc the maximum number of seconds which we can run before
          * wrapping around. For clocksources which have a mask > 32bit
@@ -651,7 +669,7 @@ void __clocksource_updatefreq_scale(struct clocksource *cs, u32 scale, u32 freq)
          * ~ 0.06ppm granularity for NTP. We apply the same 12.5%
          * margin as we do in clocksource_max_deferment()
          */
-        sec = (cs->mask - (cs->mask >> 5));
+        sec = (cs->mask - (cs->mask >> 3));
         do_div(sec, freq);
         do_div(sec, scale);
         if (!sec)
@@ -661,6 +679,20 @@ void __clocksource_updatefreq_scale(struct clocksource *cs, u32 scale, u32 freq)
 
         clocks_calc_mult_shift(&cs->mult, &cs->shift, freq,
                                NSEC_PER_SEC / scale, sec * scale);
+
+        /*
+         * for clocksources that have large mults, to avoid overflow.
+         * Since mult may be adjusted by ntp, add an safety extra margin
+         *
+         */
+        cs->maxadj = clocksource_max_adjustment(cs);
+        while ((cs->mult + cs->maxadj < cs->mult)
+                || (cs->mult - cs->maxadj > cs->mult)) {
+                cs->mult >>= 1;
+                cs->shift--;
+                cs->maxadj = clocksource_max_adjustment(cs);
+        }
+
         cs->max_idle_ns = clocksource_max_deferment(cs);
 }
 EXPORT_SYMBOL_GPL(__clocksource_updatefreq_scale);
@@ -701,6 +733,12 @@ EXPORT_SYMBOL_GPL(__clocksource_register_scale);
  */
 int clocksource_register(struct clocksource *cs)
 {
+        /* calculate max adjustment for given mult/shift */
+        cs->maxadj = clocksource_max_adjustment(cs);
+        WARN_ONCE(cs->mult + cs->maxadj < cs->mult,
+                "Clocksource %s might overflow on 11%% adjustment\n",
+                cs->name);
+
         /* calculate max idle time permitted for this clocksource */
         cs->max_idle_ns = clocksource_max_deferment(cs);
 
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index f954282d9a82..fd4a7b1625a2 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -71,7 +71,7 @@ int tick_check_broadcast_device(struct clock_event_device *dev)
              (dev->features & CLOCK_EVT_FEAT_C3STOP))
                 return 0;
 
-        clockevents_exchange_device(NULL, dev);
+        clockevents_exchange_device(tick_broadcast_device.evtdev, dev);
         tick_broadcast_device.evtdev = dev;
         if (!cpumask_empty(tick_get_broadcast_mask()))
                 tick_broadcast_start_periodic(dev);
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 2b021b0e8507..237841378c03 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -249,6 +249,8 @@ ktime_t ktime_get(void)
                 secs = xtime.tv_sec + wall_to_monotonic.tv_sec;
                 nsecs = xtime.tv_nsec + wall_to_monotonic.tv_nsec;
                 nsecs += timekeeping_get_ns();
+                /* If arch requires, add in gettimeoffset() */
+                nsecs += arch_gettimeoffset();
 
         } while (read_seqretry(&xtime_lock, seq));
         /*
@@ -280,6 +282,8 @@ void ktime_get_ts(struct timespec *ts)
                 *ts = xtime;
                 tomono = wall_to_monotonic;
                 nsecs = timekeeping_get_ns();
+                /* If arch requires, add in gettimeoffset() */
+                nsecs += arch_gettimeoffset();
 
         } while (read_seqretry(&xtime_lock, seq));
 
@@ -802,14 +806,44 @@ static void timekeeping_adjust(s64 offset)
         s64 error, interval = timekeeper.cycle_interval;
         int adj;
 
+        /*
+         * The point of this is to check if the error is greater then half
+         * an interval.
+         *
+         * First we shift it down from NTP_SHIFT to clocksource->shifted nsecs.
+         *
+         * Note we subtract one in the shift, so that error is really error*2.
+         * This "saves" dividing(shifting) intererval twice, but keeps the
+         * (error > interval) comparision as still measuring if error is
+         * larger then half an interval.
+         *
+         * Note: It does not "save" on aggrivation when reading the code.
+         */
         error = timekeeper.ntp_error >> (timekeeper.ntp_error_shift - 1);
         if (error > interval) {
+                /*
+                 * We now divide error by 4(via shift), which checks if
+                 * the error is greater then twice the interval.
+                 * If it is greater, we need a bigadjust, if its smaller,
+                 * we can adjust by 1.
+                 */
                 error >>= 2;
+                /*
+                 * XXX - In update_wall_time, we round up to the next
+                 * nanosecond, and store the amount rounded up into
+                 * the error. This causes the likely below to be unlikely.
+                 *
+                 * The properfix is to avoid rounding up by using
+                 * the high precision timekeeper.xtime_nsec instead of
+                 * xtime.tv_nsec everywhere. Fixing this will take some
+                 * time.
+                 */
                 if (likely(error <= interval))
                         adj = 1;
                 else
                         adj = timekeeping_bigadjust(error, &interval, &offset);
         } else if (error < -interval) {
+                /* See comment above, this is just switched for the negative */
                 error >>= 2;
                 if (likely(error >= -interval)) {
                         adj = -1;
@@ -817,9 +851,65 @@ static void timekeeping_adjust(s64 offset)
                         offset = -offset;
                 } else
                         adj = timekeeping_bigadjust(error, &interval, &offset);
-        } else
+        } else /* No adjustment needed */
                 return;
 
+        WARN_ONCE(timekeeper.clock->maxadj &&
+                        (timekeeper.mult + adj > timekeeper.clock->mult +
+                                                timekeeper.clock->maxadj),
+                        "Adjusting %s more then 11%% (%ld vs %ld)\n",
+                        timekeeper.clock->name, (long)timekeeper.mult + adj,
+                        (long)timekeeper.clock->mult +
+                                timekeeper.clock->maxadj);
+        /*
+         * So the following can be confusing.
+         *
+         * To keep things simple, lets assume adj == 1 for now.
+         *
+         * When adj != 1, remember that the interval and offset values
+         * have been appropriately scaled so the math is the same.
+         *
+         * The basic idea here is that we're increasing the multiplier
+         * by one, this causes the xtime_interval to be incremented by
+         * one cycle_interval. This is because:
+         *      xtime_interval = cycle_interval * mult
+         * So if mult is being incremented by one:
+         *      xtime_interval = cycle_interval * (mult + 1)
+         * Its the same as:
+         *      xtime_interval = (cycle_interval * mult) + cycle_interval
+         * Which can be shortened to:
+         *      xtime_interval += cycle_interval
+         *
+         * So offset stores the non-accumulated cycles. Thus the current
+         * time (in shifted nanoseconds) is:
+         *      now = (offset * adj) + xtime_nsec
+         * Now, even though we're adjusting the clock frequency, we have
+         * to keep time consistent. In other words, we can't jump back
+         * in time, and we also want to avoid jumping forward in time.
+         *
+         * So given the same offset value, we need the time to be the same
+         * both before and after the freq adjustment.
+         *      now = (offset * adj_1) + xtime_nsec_1
+         *      now = (offset * adj_2) + xtime_nsec_2
+         * So:
+         *      (offset * adj_1) + xtime_nsec_1 =
+         *              (offset * adj_2) + xtime_nsec_2
+         * And we know:
+         *      adj_2 = adj_1 + 1
+         * So:
+         *      (offset * adj_1) + xtime_nsec_1 =
+         *              (offset * (adj_1+1)) + xtime_nsec_2
+         *      (offset * adj_1) + xtime_nsec_1 =
+         *              (offset * adj_1) + offset + xtime_nsec_2
+         * Canceling the sides:
+         *      xtime_nsec_1 = offset + xtime_nsec_2
+         * Which gives us:
+         *      xtime_nsec_2 = xtime_nsec_1 - offset
+         * Which simplfies to:
+         *      xtime_nsec -= offset
+         *
+         * XXX - TODO: Doc ntp_error calculation.
+         */
         timekeeper.mult += adj;
         timekeeper.xtime_interval += interval;
         timekeeper.xtime_nsec -= offset;
diff --git a/kernel/timer.c b/kernel/timer.c
index dbaa62422b13..9c3c62b0c4bc 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1368,7 +1368,7 @@ SYSCALL_DEFINE0(getppid)
         int pid;
 
         rcu_read_lock();
-        pid = task_tgid_vnr(current->real_parent);
+        pid = task_tgid_vnr(rcu_dereference(current->real_parent));
         rcu_read_unlock();
 
         return pid;
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 900b409543db..b1e8943fed1d 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -152,7 +152,6 @@ void clear_ftrace_function(void)
         ftrace_pid_function = ftrace_stub;
 }
 
-#undef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
 #ifndef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
 /*
  * For those archs that do not test ftrace_trace_stop in their
@@ -1212,7 +1211,9 @@ ftrace_hash_move(struct ftrace_ops *ops, int enable,
         if (!src->count) {
                 free_ftrace_hash_rcu(*dst);
                 rcu_assign_pointer(*dst, EMPTY_HASH);
-                return 0;
+                /* still need to update the function records */
+                ret = 0;
+                goto out;
         }
 
         /*
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 581876f9f387..c212a7f934ec 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1078,7 +1078,6 @@ event_subsystem_dir(const char *name, struct dentry *d_events)
         /* First see if we did not already create this dir */
         list_for_each_entry(system, &event_subsystems, list) {
                 if (strcmp(system->name, name) == 0) {
-                        __get_system(system);
                         system->nr_events++;
                         return system->entry;
                 }
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 816d3d074979..95dc31efd6dd 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -1649,7 +1649,9 @@ static int replace_system_preds(struct event_subsystem *system,
                  */
                 err = replace_preds(call, NULL, ps, filter_string, true);
                 if (err)
-                        goto fail;
+                        call->flags |= TRACE_EVENT_FL_NO_SET_FILTER;
+                else
+                        call->flags &= ~TRACE_EVENT_FL_NO_SET_FILTER;
         }
 
         list_for_each_entry(call, &ftrace_events, list) {
@@ -1658,6 +1660,9 @@ static int replace_system_preds(struct event_subsystem *system,
                 if (strcmp(call->class->system, system->name) != 0)
                         continue;
 
+                if (call->flags & TRACE_EVENT_FL_NO_SET_FILTER)
+                        continue;
+
                 filter_item = kzalloc(sizeof(*filter_item), GFP_KERNEL);
                 if (!filter_item)
                         goto fail_mem;
@@ -1686,7 +1691,7 @@ static int replace_system_preds(struct event_subsystem *system,
                  * replace the filter for the call.
                  */
                 filter = call->filter;
-                call->filter = filter_item->filter;
+                rcu_assign_pointer(call->filter, filter_item->filter);
                 filter_item->filter = filter;
 
                 fail = false;
@@ -1741,7 +1746,7 @@ int apply_event_filter(struct ftrace_event_call *call, char *filter_string)
                 filter = call->filter;
                 if (!filter)
                         goto out_unlock;
-                call->filter = NULL;
+                RCU_INIT_POINTER(call->filter, NULL);
                 /* Make sure the filter is not being used */
                 synchronize_sched();
                 __free_filter(filter);
@@ -1782,7 +1787,7 @@ out:
          * string
          */
         tmp = call->filter;
-        call->filter = filter;
+        rcu_assign_pointer(call->filter, filter);
         if (tmp) {
                 /* Make sure the call is done with the filter */
                 synchronize_sched();