sched: Move all scheduler bits into kernel/sched/

There's too many sched*.[ch] files in kernel/, give them their own
directory.

(No code changed, other than Makefile glue added.)

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 2045 deletions

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
deleted file mode 100644
index 023b3550250..00000000000
--- a/kernel/sched_rt.c
+++ /dev/null
@@ -1,2045 +0,0 @@
-/*
- * Real-Time Scheduling Class (mapped to the SCHED_FIFO and SCHED_RR
- * policies)
- */
-
-#include "sched.h"
-
-#include <linux/slab.h>
-
-static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun);
-
-struct rt_bandwidth def_rt_bandwidth;
-
-static enum hrtimer_restart sched_rt_period_timer(struct hrtimer *timer)
-{
-	struct rt_bandwidth *rt_b =
-		container_of(timer, struct rt_bandwidth, rt_period_timer);
-	ktime_t now;
-	int overrun;
-	int idle = 0;
-
-	for (;;) {
-		now = hrtimer_cb_get_time(timer);
-		overrun = hrtimer_forward(timer, now, rt_b->rt_period);
-
-		if (!overrun)
-			break;
-
-		idle = do_sched_rt_period_timer(rt_b, overrun);
-	}
-
-	return idle ? HRTIMER_NORESTART : HRTIMER_RESTART;
-}
-
-void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime)
-{
-	rt_b->rt_period = ns_to_ktime(period);
-	rt_b->rt_runtime = runtime;
-
-	raw_spin_lock_init(&rt_b->rt_runtime_lock);
-
-	hrtimer_init(&rt_b->rt_period_timer,
-			CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-	rt_b->rt_period_timer.function = sched_rt_period_timer;
-}
-
-static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
-{
-	if (!rt_bandwidth_enabled() || rt_b->rt_runtime == RUNTIME_INF)
-		return;
-
-	if (hrtimer_active(&rt_b->rt_period_timer))
-		return;
-
-	raw_spin_lock(&rt_b->rt_runtime_lock);
-	start_bandwidth_timer(&rt_b->rt_period_timer, rt_b->rt_period);
-	raw_spin_unlock(&rt_b->rt_runtime_lock);
-}
-
-void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
-{
-	struct rt_prio_array *array;
-	int i;
-
-	array = &rt_rq->active;
-	for (i = 0; i < MAX_RT_PRIO; i++) {
-		INIT_LIST_HEAD(array->queue + i);
-		__clear_bit(i, array->bitmap);
-	}
-	/* delimiter for bitsearch: */
-	__set_bit(MAX_RT_PRIO, array->bitmap);
-
-#if defined CONFIG_SMP
-	rt_rq->highest_prio.curr = MAX_RT_PRIO;
-	rt_rq->highest_prio.next = MAX_RT_PRIO;
-	rt_rq->rt_nr_migratory = 0;
-	rt_rq->overloaded = 0;
-	plist_head_init(&rt_rq->pushable_tasks);
-#endif
-
-	rt_rq->rt_time = 0;
-	rt_rq->rt_throttled = 0;
-	rt_rq->rt_runtime = 0;
-	raw_spin_lock_init(&rt_rq->rt_runtime_lock);
-}
-
-#ifdef CONFIG_RT_GROUP_SCHED
-static void destroy_rt_bandwidth(struct rt_bandwidth *rt_b)
-{
-	hrtimer_cancel(&rt_b->rt_period_timer);
-}
-
-#define rt_entity_is_task(rt_se) (!(rt_se)->my_q)
-
-static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
-{
-#ifdef CONFIG_SCHED_DEBUG
-	WARN_ON_ONCE(!rt_entity_is_task(rt_se));
-#endif
-	return container_of(rt_se, struct task_struct, rt);
-}
-
-static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
-{
-	return rt_rq->rq;
-}
-
-static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se)
-{
-	return rt_se->rt_rq;
-}
-
-void free_rt_sched_group(struct task_group *tg)
-{
-	int i;
-
-	if (tg->rt_se)
-		destroy_rt_bandwidth(&tg->rt_bandwidth);
-
-	for_each_possible_cpu(i) {
-		if (tg->rt_rq)
-			kfree(tg->rt_rq[i]);
-		if (tg->rt_se)
-			kfree(tg->rt_se[i]);
-	}
-
-	kfree(tg->rt_rq);
-	kfree(tg->rt_se);
-}
-
-void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
-		struct sched_rt_entity *rt_se, int cpu,
-		struct sched_rt_entity *parent)
-{
-	struct rq *rq = cpu_rq(cpu);
-
-	rt_rq->highest_prio.curr = MAX_RT_PRIO;
-	rt_rq->rt_nr_boosted = 0;
-	rt_rq->rq = rq;
-	rt_rq->tg = tg;
-
-	tg->rt_rq[cpu] = rt_rq;
-	tg->rt_se[cpu] = rt_se;
-
-	if (!rt_se)
-		return;
-
-	if (!parent)
-		rt_se->rt_rq = &rq->rt;
-	else
-		rt_se->rt_rq = parent->my_q;
-
-	rt_se->my_q = rt_rq;
-	rt_se->parent = parent;
-	INIT_LIST_HEAD(&rt_se->run_list);
-}
-
-int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
-{
-	struct rt_rq *rt_rq;
-	struct sched_rt_entity *rt_se;
-	int i;
-
-	tg->rt_rq = kzalloc(sizeof(rt_rq) * nr_cpu_ids, GFP_KERNEL);
-	if (!tg->rt_rq)
-		goto err;
-	tg->rt_se = kzalloc(sizeof(rt_se) * nr_cpu_ids, GFP_KERNEL);
-	if (!tg->rt_se)
-		goto err;
-
-	init_rt_bandwidth(&tg->rt_bandwidth,
-			ktime_to_ns(def_rt_bandwidth.rt_period), 0);
-
-	for_each_possible_cpu(i) {
-		rt_rq = kzalloc_node(sizeof(struct rt_rq),
-				     GFP_KERNEL, cpu_to_node(i));
-		if (!rt_rq)
-			goto err;
-
-		rt_se = kzalloc_node(sizeof(struct sched_rt_entity),
-				     GFP_KERNEL, cpu_to_node(i));
-		if (!rt_se)
-			goto err_free_rq;
-
-		init_rt_rq(rt_rq, cpu_rq(i));
-		rt_rq->rt_runtime = tg->rt_bandwidth.rt_runtime;
-		init_tg_rt_entry(tg, rt_rq, rt_se, i, parent->rt_se[i]);
-	}
-
-	return 1;
-
-err_free_rq:
-	kfree(rt_rq);
-err:
-	return 0;
-}
-
-#else /* CONFIG_RT_GROUP_SCHED */
-
-#define rt_entity_is_task(rt_se) (1)
-
-static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
-{
-	return container_of(rt_se, struct task_struct, rt);
-}
-
-static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
-{
-	return container_of(rt_rq, struct rq, rt);
-}
-
-static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se)
-{
-	struct task_struct *p = rt_task_of(rt_se);
-	struct rq *rq = task_rq(p);
-
-	return &rq->rt;
-}
-
-void free_rt_sched_group(struct task_group *tg) { }
-
-int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
-{
-	return 1;
-}
-#endif /* CONFIG_RT_GROUP_SCHED */
-
-#ifdef CONFIG_SMP
-
-static inline int rt_overloaded(struct rq *rq)
-{
-	return atomic_read(&rq->rd->rto_count);
-}
-
-static inline void rt_set_overload(struct rq *rq)
-{
-	if (!rq->online)
-		return;
-
-	cpumask_set_cpu(rq->cpu, rq->rd->rto_mask);
-	/*
-	 * Make sure the mask is visible before we set
-	 * the overload count. That is checked to determine
-	 * if we should look at the mask. It would be a shame
-	 * if we looked at the mask, but the mask was not
-	 * updated yet.
-	 */
-	wmb();
-	atomic_inc(&rq->rd->rto_count);
-}
-
-static inline void rt_clear_overload(struct rq *rq)
-{
-	if (!rq->online)
-		return;
-
-	/* the order here really doesn't matter */
-	atomic_dec(&rq->rd->rto_count);
-	cpumask_clear_cpu(rq->cpu, rq->rd->rto_mask);
-}
-
-static void update_rt_migration(struct rt_rq *rt_rq)
-{
-	if (rt_rq->rt_nr_migratory && rt_rq->rt_nr_total > 1) {
-		if (!rt_rq->overloaded) {
-			rt_set_overload(rq_of_rt_rq(rt_rq));
-			rt_rq->overloaded = 1;
-		}
-	} else if (rt_rq->overloaded) {
-		rt_clear_overload(rq_of_rt_rq(rt_rq));
-		rt_rq->overloaded = 0;
-	}
-}
-
-static void inc_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
-{
-	if (!rt_entity_is_task(rt_se))
-		return;
-
-	rt_rq = &rq_of_rt_rq(rt_rq)->rt;
-
-	rt_rq->rt_nr_total++;
-	if (rt_se->nr_cpus_allowed > 1)
-		rt_rq->rt_nr_migratory++;
-
-	update_rt_migration(rt_rq);
-}
-
-static void dec_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
-{
-	if (!rt_entity_is_task(rt_se))
-		return;
-
-	rt_rq = &rq_of_rt_rq(rt_rq)->rt;
-
-	rt_rq->rt_nr_total--;
-	if (rt_se->nr_cpus_allowed > 1)
-		rt_rq->rt_nr_migratory--;
-
-	update_rt_migration(rt_rq);
-}
-
-static inline int has_pushable_tasks(struct rq *rq)
-{
-	return !plist_head_empty(&rq->rt.pushable_tasks);
-}
-
-static void enqueue_pushable_task(struct rq *rq, struct task_struct *p)
-{
-	plist_del(&p->pushable_tasks, &rq->rt.pushable_tasks);
-	plist_node_init(&p->pushable_tasks, p->prio);
-	plist_add(&p->pushable_tasks, &rq->rt.pushable_tasks);
-
-	/* Update the highest prio pushable task */
-	if (p->prio < rq->rt.highest_prio.next)
-		rq->rt.highest_prio.next = p->prio;
-}
-
-static void dequeue_pushable_task(struct rq *rq, struct task_struct *p)
-{
-	plist_del(&p->pushable_tasks, &rq->rt.pushable_tasks);
-
-	/* Update the new highest prio pushable task */
-	if (has_pushable_tasks(rq)) {
-		p = plist_first_entry(&rq->rt.pushable_tasks,
-				      struct task_struct, pushable_tasks);
-		rq->rt.highest_prio.next = p->prio;
-	} else
-		rq->rt.highest_prio.next = MAX_RT_PRIO;
-}
-
-#else
-
-static inline void enqueue_pushable_task(struct rq *rq, struct task_struct *p)
-{
-}
-
-static inline void dequeue_pushable_task(struct rq *rq, struct task_struct *p)
-{
-}
-
-static inline
-void inc_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
-{
-}
-
-static inline
-void dec_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
-{
-}
-
-#endif /* CONFIG_SMP */
-
-static inline int on_rt_rq(struct sched_rt_entity *rt_se)
-{
-	return !list_empty(&rt_se->run_list);
-}
-
-#ifdef CONFIG_RT_GROUP_SCHED
-
-static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
-{
-	if (!rt_rq->tg)
-		return RUNTIME_INF;
-
-	return rt_rq->rt_runtime;
-}
-
-static inline u64 sched_rt_period(struct rt_rq *rt_rq)
-{
-	return ktime_to_ns(rt_rq->tg->rt_bandwidth.rt_period);
-}
-
-typedef struct task_group *rt_rq_iter_t;
-
-static inline struct task_group *next_task_group(struct task_group *tg)
-{
-	do {
-		tg = list_entry_rcu(tg->list.next,
-			typeof(struct task_group), list);
-	} while (&tg->list != &task_groups && task_group_is_autogroup(tg));
-
-	if (&tg->list == &task_groups)
-		tg = NULL;
-
-	return tg;
-}
-
-#define for_each_rt_rq(rt_rq, iter, rq)					\
-	for (iter = container_of(&task_groups, typeof(*iter), list);	\
-		(iter = next_task_group(iter)) &&			\
-		(rt_rq = iter->rt_rq[cpu_of(rq)]);)
-
-static inline void list_add_leaf_rt_rq(struct rt_rq *rt_rq)
-{
-	list_add_rcu(&rt_rq->leaf_rt_rq_list,
-			&rq_of_rt_rq(rt_rq)->leaf_rt_rq_list);
-}
-
-static inline void list_del_leaf_rt_rq(struct rt_rq *rt_rq)
-{
-	list_del_rcu(&rt_rq->leaf_rt_rq_list);
-}
-
-#define for_each_leaf_rt_rq(rt_rq, rq) \
-	list_for_each_entry_rcu(rt_rq, &rq->leaf_rt_rq_list, leaf_rt_rq_list)
-
-#define for_each_sched_rt_entity(rt_se) \
-	for (; rt_se; rt_se = rt_se->parent)
-
-static inline struct rt_rq *group_rt_rq(struct sched_rt_entity *rt_se)
-{
-	return rt_se->my_q;
-}
-
-static void enqueue_rt_entity(struct sched_rt_entity *rt_se, bool head);
-static void dequeue_rt_entity(struct sched_rt_entity *rt_se);
-
-static void sched_rt_rq_enqueue(struct rt_rq *rt_rq)
-{
-	struct task_struct *curr = rq_of_rt_rq(rt_rq)->curr;
-	struct sched_rt_entity *rt_se;
-
-	int cpu = cpu_of(rq_of_rt_rq(rt_rq));
-
-	rt_se = rt_rq->tg->rt_se[cpu];
-
-	if (rt_rq->rt_nr_running) {
-		if (rt_se && !on_rt_rq(rt_se))
-			enqueue_rt_entity(rt_se, false);
-		if (rt_rq->highest_prio.curr < curr->prio)
-			resched_task(curr);
-	}
-}
-
-static void sched_rt_rq_dequeue(struct rt_rq *rt_rq)
-{
-	struct sched_rt_entity *rt_se;
-	int cpu = cpu_of(rq_of_rt_rq(rt_rq));
-
-	rt_se = rt_rq->tg->rt_se[cpu];
-
-	if (rt_se && on_rt_rq(rt_se))
-		dequeue_rt_entity(rt_se);
-}
-
-static inline int rt_rq_throttled(struct rt_rq *rt_rq)
-{
-	return rt_rq->rt_throttled && !rt_rq->rt_nr_boosted;
-}
-
-static int rt_se_boosted(struct sched_rt_entity *rt_se)
-{
-	struct rt_rq *rt_rq = group_rt_rq(rt_se);
-	struct task_struct *p;
-
-	if (rt_rq)
-		return !!rt_rq->rt_nr_boosted;
-
-	p = rt_task_of(rt_se);
-	return p->prio != p->normal_prio;
-}
-
-#ifdef CONFIG_SMP
-static inline const struct cpumask *sched_rt_period_mask(void)
-{
-	return cpu_rq(smp_processor_id())->rd->span;
-}
-#else
-static inline const struct cpumask *sched_rt_period_mask(void)
-{
-	return cpu_online_mask;
-}
-#endif
-
-static inline
-struct rt_rq *sched_rt_period_rt_rq(struct rt_bandwidth *rt_b, int cpu)
-{
-	return container_of(rt_b, struct task_group, rt_bandwidth)->rt_rq[cpu];
-}
-
-static inline struct rt_bandwidth *sched_rt_bandwidth(struct rt_rq *rt_rq)
-{
-	return &rt_rq->tg->rt_bandwidth;
-}
-
-#else /* !CONFIG_RT_GROUP_SCHED */
-
-static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
-{
-	return rt_rq->rt_runtime;
-}
-
-static inline u64 sched_rt_period(struct rt_rq *rt_rq)
-{
-	return ktime_to_ns(def_rt_bandwidth.rt_period);
-}
-
-typedef struct rt_rq *rt_rq_iter_t;
-
-#define for_each_rt_rq(rt_rq, iter, rq) \
-	for ((void) iter, rt_rq = &rq->rt; rt_rq; rt_rq = NULL)
-
-static inline void list_add_leaf_rt_rq(struct rt_rq *rt_rq)
-{
-}
-
-static inline void list_del_leaf_rt_rq(struct rt_rq *rt_rq)
-{
-}
-
-#define for_each_leaf_rt_rq(rt_rq, rq) \
-	for (rt_rq = &rq->rt; rt_rq; rt_rq = NULL)
-
-#define for_each_sched_rt_entity(rt_se) \
-	for (; rt_se; rt_se = NULL)
-
-static inline struct rt_rq *group_rt_rq(struct sched_rt_entity *rt_se)
-{
-	return NULL;
-}
-
-static inline void sched_rt_rq_enqueue(struct rt_rq *rt_rq)
-{
-	if (rt_rq->rt_nr_running)
-		resched_task(rq_of_rt_rq(rt_rq)->curr);
-}
-
-static inline void sched_rt_rq_dequeue(struct rt_rq *rt_rq)
-{
-}
-
-static inline int rt_rq_throttled(struct rt_rq *rt_rq)
-{
-	return rt_rq->rt_throttled;
-}
-
-static inline const struct cpumask *sched_rt_period_mask(void)
-{
-	return cpu_online_mask;
-}
-
-static inline
-struct rt_rq *sched_rt_period_rt_rq(struct rt_bandwidth *rt_b, int cpu)
-{
-	return &cpu_rq(cpu)->rt;
-}
-
-static inline struct rt_bandwidth *sched_rt_bandwidth(struct rt_rq *rt_rq)
-{
-	return &def_rt_bandwidth;
-}
-
-#endif /* CONFIG_RT_GROUP_SCHED */
-
-#ifdef CONFIG_SMP
-/*
- * We ran out of runtime, see if we can borrow some from our neighbours.
- */
-static int do_balance_runtime(struct rt_rq *rt_rq)
-{
-	struct rt_bandwidth *rt_b = sched_rt_bandwidth(rt_rq);
-	struct root_domain *rd = cpu_rq(smp_processor_id())->rd;
-	int i, weight, more = 0;
-	u64 rt_period;
-
-	weight = cpumask_weight(rd->span);
-
-	raw_spin_lock(&rt_b->rt_runtime_lock);
-	rt_period = ktime_to_ns(rt_b->rt_period);
-	for_each_cpu(i, rd->span) {
-		struct rt_rq *iter = sched_rt_period_rt_rq(rt_b, i);
-		s64 diff;
-
-		if (iter == rt_rq)
-			continue;
-
-		raw_spin_lock(&iter->rt_runtime_lock);
-		/*
-		 * Either all rqs have inf runtime and there's nothing to steal
-		 * or __disable_runtime() below sets a specific rq to inf to
-		 * indicate its been disabled and disalow stealing.
-		 */
-		if (iter->rt_runtime == RUNTIME_INF)
-			goto next;
-
-		/*
-		 * From runqueues with spare time, take 1/n part of their
-		 * spare time, but no more than our period.
-		 */
-		diff = iter->rt_runtime - iter->rt_time;
-		if (diff > 0) {
-			diff = div_u64((u64)diff, weight);
-			if (rt_rq->rt_runtime + diff > rt_period)
-				diff = rt_period - rt_rq->rt_runtime;
-			iter->rt_runtime -= diff;
-			rt_rq->rt_runtime += diff;
-			more = 1;
-			if (rt_rq->rt_runtime == rt_period) {
-				raw_spin_unlock(&iter->rt_runtime_lock);
-				break;
-			}
-		}
-next:
-		raw_spin_unlock(&iter->rt_runtime_lock);
-	}
-	raw_spin_unlock(&rt_b->rt_runtime_lock);
-
-	return more;
-}
-
-/*
- * Ensure this RQ takes back all the runtime it lend to its neighbours.
- */
-static void __disable_runtime(struct rq *rq)
-{
-	struct root_domain *rd = rq->rd;
-	rt_rq_iter_t iter;
-	struct rt_rq *rt_rq;
-
-	if (unlikely(!scheduler_running))
-		return;
-
-	for_each_rt_rq(rt_rq, iter, rq) {
-		struct rt_bandwidth *rt_b = sched_rt_bandwidth(rt_rq);
-		s64 want;
-		int i;
-
-		raw_spin_lock(&rt_b->rt_runtime_lock);
-		raw_spin_lock(&rt_rq->rt_runtime_lock);
-		/*
-		 * Either we're all inf and nobody needs to borrow, or we're
-		 * already disabled and thus have nothing to do, or we have
-		 * exactly the right amount of runtime to take out.
-		 */
-		if (rt_rq->rt_runtime == RUNTIME_INF ||
-				rt_rq->rt_runtime == rt_b->rt_runtime)
-			goto balanced;
-		raw_spin_unlock(&rt_rq->rt_runtime_lock);
-
-		/*
-		 * Calculate the difference between what we started out with
-		 * and what we current have, that's the amount of runtime
-		 * we lend and now have to reclaim.
-		 */
-		want = rt_b->rt_runtime - rt_rq->rt_runtime;
-
-		/*
-		 * Greedy reclaim, take back as much as we can.
-		 */
-		for_each_cpu(i, rd->span) {
-			struct rt_rq *iter = sched_rt_period_rt_rq(rt_b, i);
-			s64 diff;
-
-			/*
-			 * Can't reclaim from ourselves or disabled runqueues.
-			 */
-			if (iter == rt_rq || iter->rt_runtime == RUNTIME_INF)
-				continue;
-
-			raw_spin_lock(&iter->rt_runtime_lock);
-			if (want > 0) {
-				diff = min_t(s64, iter->rt_runtime, want);
-				iter->rt_runtime -= diff;
-				want -= diff;
-			} else {
-				iter->rt_runtime -= want;
-				want -= want;
-			}
-			raw_spin_unlock(&iter->rt_runtime_lock);
-
-			if (!want)
-				break;
-		}
-
-		raw_spin_lock(&rt_rq->rt_runtime_lock);
-		/*
-		 * We cannot be left wanting - that would mean some runtime
-		 * leaked out of the system.
-		 */
-		BUG_ON(want);
-balanced:
-		/*
-		 * Disable all the borrow logic by pretending we have inf
-		 * runtime - in which case borrowing doesn't make sense.
-		 */
-		rt_rq->rt_runtime = RUNTIME_INF;
-		raw_spin_unlock(&rt_rq->rt_runtime_lock);
-		raw_spin_unlock(&rt_b->rt_runtime_lock);
-	}
-}
-
-static void disable_runtime(struct rq *rq)
-{
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&rq->lock, flags);
-	__disable_runtime(rq);
-	raw_spin_unlock_irqrestore(&rq->lock, flags);
-}
-
-static void __enable_runtime(struct rq *rq)
-{
-	rt_rq_iter_t iter;
-	struct rt_rq *rt_rq;
-
-	if (unlikely(!scheduler_running))
-		return;
-
-	/*
-	 * Reset each runqueue's bandwidth settings
-	 */
-	for_each_rt_rq(rt_rq, iter, rq) {
-		struct rt_bandwidth *rt_b = sched_rt_bandwidth(rt_rq);
-
-		raw_spin_lock(&rt_b->rt_runtime_lock);
-		raw_spin_lock(&rt_rq->rt_runtime_lock);
-		rt_rq->rt_runtime = rt_b->rt_runtime;
-		rt_rq->rt_time = 0;
-		rt_rq->rt_throttled = 0;
-		raw_spin_unlock(&rt_rq->rt_runtime_lock);
-		raw_spin_unlock(&rt_b->rt_runtime_lock);
-	}
-}
-
-static void enable_runtime(struct rq *rq)
-{
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&rq->lock, flags);
-	__enable_runtime(rq);
-	raw_spin_unlock_irqrestore(&rq->lock, flags);
-}
-
-int update_runtime(struct notifier_block *nfb, unsigned long action, void *hcpu)
-{
-	int cpu = (int)(long)hcpu;
-
-	switch (action) {
-	case CPU_DOWN_PREPARE:
-	case CPU_DOWN_PREPARE_FROZEN:
-		disable_runtime(cpu_rq(cpu));
-		return NOTIFY_OK;
-
-	case CPU_DOWN_FAILED:
-	case CPU_DOWN_FAILED_FROZEN:
-	case CPU_ONLINE:
-	case CPU_ONLINE_FROZEN:
-		enable_runtime(cpu_rq(cpu));
-		return NOTIFY_OK;
-
-	default:
-		return NOTIFY_DONE;
-	}
-}
-
-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);
-		raw_spin_lock(&rt_rq->rt_runtime_lock);
-	}
-
-	return more;
-}
-#else /* !CONFIG_SMP */
-static inline int balance_runtime(struct rt_rq *rt_rq)
-{
-	return 0;
-}
-#endif /* CONFIG_SMP */
-
-static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
-{
-	int i, idle = 1;
-	const struct cpumask *span;
-
-	if (!rt_bandwidth_enabled() || rt_b->rt_runtime == RUNTIME_INF)
-		return 1;
-
-	span = sched_rt_period_mask();
-	for_each_cpu(i, span) {
-		int enqueue = 0;
-		struct rt_rq *rt_rq = sched_rt_period_rt_rq(rt_b, i);
-		struct rq *rq = rq_of_rt_rq(rt_rq);
-
-		raw_spin_lock(&rq->lock);
-		if (rt_rq->rt_time) {
-			u64 runtime;
-
-			raw_spin_lock(&rt_rq->rt_runtime_lock);
-			if (rt_rq->rt_throttled)
-				balance_runtime(rt_rq);
-			runtime = rt_rq->rt_runtime;
-			rt_rq->rt_time -= min(rt_rq->rt_time, overrun*runtime);
-			if (rt_rq->rt_throttled && rt_rq->rt_time < runtime) {
-				rt_rq->rt_throttled = 0;
-				enqueue = 1;
-
-				/*
-				 * Force a clock update if the CPU was idle,
-				 * lest wakeup -> unthrottle time accumulate.
-				 */
-				if (rt_rq->rt_nr_running && rq->curr == rq->idle)
-					rq->skip_clock_update = -1;
-			}
-			if (rt_rq->rt_time || rt_rq->rt_nr_running)
-				idle = 0;
-			raw_spin_unlock(&rt_rq->rt_runtime_lock);
-		} else if (rt_rq->rt_nr_running) {
-			idle = 0;
-			if (!rt_rq_throttled(rt_rq))
-				enqueue = 1;
-		}
-
-		if (enqueue)
-			sched_rt_rq_enqueue(rt_rq);
-		raw_spin_unlock(&rq->lock);
-	}
-
-	return idle;
-}
-
-static inline int rt_se_prio(struct sched_rt_entity *rt_se)
-{
-#ifdef CONFIG_RT_GROUP_SCHED
-	struct rt_rq *rt_rq = group_rt_rq(rt_se);
-
-	if (rt_rq)
-		return rt_rq->highest_prio.curr;
-#endif
-
-	return rt_task_of(rt_se)->prio;
-}
-
-static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
-{
-	u64 runtime = sched_rt_runtime(rt_rq);
-
-	if (rt_rq->rt_throttled)
-		return rt_rq_throttled(rt_rq);
-
-	if (sched_rt_runtime(rt_rq) >= sched_rt_period(rt_rq))
-		return 0;
-
-	balance_runtime(rt_rq);
-	runtime = sched_rt_runtime(rt_rq);
-	if (runtime == RUNTIME_INF)
-		return 0;
-
-	if (rt_rq->rt_time > runtime) {
-		rt_rq->rt_throttled = 1;
-		printk_once(KERN_WARNING "sched: RT throttling activated\n");
-		if (rt_rq_throttled(rt_rq)) {
-			sched_rt_rq_dequeue(rt_rq);
-			return 1;
-		}
-	}
-
-	return 0;
-}
-
-/*
- * Update the current task's runtime statistics. Skip current tasks that
- * are not in our scheduling class.
- */
-static void update_curr_rt(struct rq *rq)
-{
-	struct task_struct *curr = rq->curr;
-	struct sched_rt_entity *rt_se = &curr->rt;
-	struct rt_rq *rt_rq = rt_rq_of_se(rt_se);
-	u64 delta_exec;
-
-	if (curr->sched_class != &rt_sched_class)
-		return;
-
-	delta_exec = rq->clock_task - curr->se.exec_start;
-	if (unlikely((s64)delta_exec < 0))
-		delta_exec = 0;
-
-	schedstat_set(curr->se.statistics.exec_max, max(curr->se.statistics.exec_max, delta_exec));
-
-	curr->se.sum_exec_runtime += delta_exec;
-	account_group_exec_runtime(curr, delta_exec);
-
-	curr->se.exec_start = rq->clock_task;
-	cpuacct_charge(curr, delta_exec);
-
-	sched_rt_avg_update(rq, delta_exec);
-
-	if (!rt_bandwidth_enabled())
-		return;
-
-	for_each_sched_rt_entity(rt_se) {
-		rt_rq = rt_rq_of_se(rt_se);
-
-		if (sched_rt_runtime(rt_rq) != RUNTIME_INF) {
-			raw_spin_lock(&rt_rq->rt_runtime_lock);
-			rt_rq->rt_time += delta_exec;
-			if (sched_rt_runtime_exceeded(rt_rq))
-				resched_task(curr);
-			raw_spin_unlock(&rt_rq->rt_runtime_lock);
-		}
-	}
-}
-
-#if defined CONFIG_SMP
-
-static void
-inc_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio)
-{
-	struct rq *rq = rq_of_rt_rq(rt_rq);
-
-	if (rq->online && prio < prev_prio)
-		cpupri_set(&rq->rd->cpupri, rq->cpu, prio);
-}
-
-static void
-dec_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio)
-{
-	struct rq *rq = rq_of_rt_rq(rt_rq);
-
-	if (rq->online && rt_rq->highest_prio.curr != prev_prio)
-		cpupri_set(&rq->rd->cpupri, rq->cpu, rt_rq->highest_prio.curr);
-}
-
-#else /* CONFIG_SMP */
-
-static inline
-void inc_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio) {}
-static inline
-void dec_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio) {}
-
-#endif /* CONFIG_SMP */
-
-#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
-static void
-inc_rt_prio(struct rt_rq *rt_rq, int prio)
-{
-	int prev_prio = rt_rq->highest_prio.curr;
-
-	if (prio < prev_prio)
-		rt_rq->highest_prio.curr = prio;
-
-	inc_rt_prio_smp(rt_rq, prio, prev_prio);
-}
-
-static void
-dec_rt_prio(struct rt_rq *rt_rq, int prio)
-{
-	int prev_prio = rt_rq->highest_prio.curr;
-
-	if (rt_rq->rt_nr_running) {
-
-		WARN_ON(prio < prev_prio);
-
-		/*
-		 * This may have been our highest task, and therefore
-		 * we may have some recomputation to do
-		 */
-		if (prio == prev_prio) {
-			struct rt_prio_array *array = &rt_rq->active;
-
-			rt_rq->highest_prio.curr =
-				sched_find_first_bit(array->bitmap);
-		}
-
-	} else
-		rt_rq->highest_prio.curr = MAX_RT_PRIO;
-
-	dec_rt_prio_smp(rt_rq, prio, prev_prio);
-}
-
-#else
-
-static inline void inc_rt_prio(struct rt_rq *rt_rq, int prio) {}
-static inline void dec_rt_prio(struct rt_rq *rt_rq, int prio) {}
-
-#endif /* CONFIG_SMP || CONFIG_RT_GROUP_SCHED */
-
-#ifdef CONFIG_RT_GROUP_SCHED
-
-static void
-inc_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
-{
-	if (rt_se_boosted(rt_se))
-		rt_rq->rt_nr_boosted++;
-
-	if (rt_rq->tg)
-		start_rt_bandwidth(&rt_rq->tg->rt_bandwidth);
-}
-
-static void
-dec_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
-{
-	if (rt_se_boosted(rt_se))
-		rt_rq->rt_nr_boosted--;
-
-	WARN_ON(!rt_rq->rt_nr_running && rt_rq->rt_nr_boosted);
-}
-
-#else /* CONFIG_RT_GROUP_SCHED */
-
-static void
-inc_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
-{
-	start_rt_bandwidth(&def_rt_bandwidth);
-}
-
-static inline
-void dec_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) {}
-
-#endif /* CONFIG_RT_GROUP_SCHED */
-
-static inline
-void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
-{
-	int prio = rt_se_prio(rt_se);
-
-	WARN_ON(!rt_prio(prio));
-	rt_rq->rt_nr_running++;
-
-	inc_rt_prio(rt_rq, prio);
-	inc_rt_migration(rt_se, rt_rq);
-	inc_rt_group(rt_se, rt_rq);
-}
-
-static inline
-void dec_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
-{
-	WARN_ON(!rt_prio(rt_se_prio(rt_se)));
-	WARN_ON(!rt_rq->rt_nr_running);
-	rt_rq->rt_nr_running--;
-
-	dec_rt_prio(rt_rq, rt_se_prio(rt_se));
-	dec_rt_migration(rt_se, rt_rq);
-	dec_rt_group(rt_se, rt_rq);
-}
-
-static void __enqueue_rt_entity(struct sched_rt_entity *rt_se, bool head)
-{
-	struct rt_rq *rt_rq = rt_rq_of_se(rt_se);
-	struct rt_prio_array *array = &rt_rq->active;
-	struct rt_rq *group_rq = group_rt_rq(rt_se);
-	struct list_head *queue = array->queue + rt_se_prio(rt_se);
-
-	/*
-	 * Don't enqueue the group if its throttled, or when empty.
-	 * The latter is a consequence of the former when a child group
-	 * get throttled and the current group doesn't have any other
-	 * active members.
-	 */
-	if (group_rq && (rt_rq_throttled(group_rq) || !group_rq->rt_nr_running))
-		return;
-
-	if (!rt_rq->rt_nr_running)
-		list_add_leaf_rt_rq(rt_rq);
-
-	if (head)
-		list_add(&rt_se->run_list, queue);
-	else
-		list_add_tail(&rt_se->run_list, queue);
-	__set_bit(rt_se_prio(rt_se), array->bitmap);
-
-	inc_rt_tasks(rt_se, rt_rq);
-}
-
-static void __dequeue_rt_entity(struct sched_rt_entity *rt_se)
-{
-	struct rt_rq *rt_rq = rt_rq_of_se(rt_se);
-	struct rt_prio_array *array = &rt_rq->active;
-
-	list_del_init(&rt_se->run_list);
-	if (list_empty(array->queue + rt_se_prio(rt_se)))
-		__clear_bit(rt_se_prio(rt_se), array->bitmap);
-
-	dec_rt_tasks(rt_se, rt_rq);
-	if (!rt_rq->rt_nr_running)
-		list_del_leaf_rt_rq(rt_rq);
-}
-
-/*
- * Because the prio of an upper entry depends on the lower
- * entries, we must remove entries top - down.
- */
-static void dequeue_rt_stack(struct sched_rt_entity *rt_se)
-{
-	struct sched_rt_entity *back = NULL;
-
-	for_each_sched_rt_entity(rt_se) {
-		rt_se->back = back;
-		back = rt_se;
-	}
-
-	for (rt_se = back; rt_se; rt_se = rt_se->back) {
-		if (on_rt_rq(rt_se))
-			__dequeue_rt_entity(rt_se);
-	}
-}
-
-static void enqueue_rt_entity(struct sched_rt_entity *rt_se, bool head)
-{
-	dequeue_rt_stack(rt_se);
-	for_each_sched_rt_entity(rt_se)
-		__enqueue_rt_entity(rt_se, head);
-}
-
-static void dequeue_rt_entity(struct sched_rt_entity *rt_se)
-{
-	dequeue_rt_stack(rt_se);
-
-	for_each_sched_rt_entity(rt_se) {
-		struct rt_rq *rt_rq = group_rt_rq(rt_se);
-
-		if (rt_rq && rt_rq->rt_nr_running)
-			__enqueue_rt_entity(rt_se, false);
-	}
-}
-
-/*
- * Adding/removing a task to/from a priority array:
- */
-static void
-enqueue_task_rt(struct rq *rq, struct task_struct *p, int flags)
-{
-	struct sched_rt_entity *rt_se = &p->rt;
-
-	if (flags & ENQUEUE_WAKEUP)
-		rt_se->timeout = 0;
-
-	enqueue_rt_entity(rt_se, flags & ENQUEUE_HEAD);
-
-	if (!task_current(rq, p) && p->rt.nr_cpus_allowed > 1)
-		enqueue_pushable_task(rq, p);
-
-	inc_nr_running(rq);
-}
-
-static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int flags)
-{
-	struct sched_rt_entity *rt_se = &p->rt;
-
-	update_curr_rt(rq);
-	dequeue_rt_entity(rt_se);
-
-	dequeue_pushable_task(rq, p);
-
-	dec_nr_running(rq);
-}
-
-/*
- * Put task to the head or the end of the run list without the overhead of
- * dequeue followed by enqueue.
- */
-static void
-requeue_rt_entity(struct rt_rq *rt_rq, struct sched_rt_entity *rt_se, int head)
-{
-	if (on_rt_rq(rt_se)) {
-		struct rt_prio_array *array = &rt_rq->active;
-		struct list_head *queue = array->queue + rt_se_prio(rt_se);
-
-		if (head)
-			list_move(&rt_se->run_list, queue);
-		else
-			list_move_tail(&rt_se->run_list, queue);
-	}
-}
-
-static void requeue_task_rt(struct rq *rq, struct task_struct *p, int head)
-{
-	struct sched_rt_entity *rt_se = &p->rt;
-	struct rt_rq *rt_rq;
-
-	for_each_sched_rt_entity(rt_se) {
-		rt_rq = rt_rq_of_se(rt_se);
-		requeue_rt_entity(rt_rq, rt_se, head);
-	}
-}
-
-static void yield_task_rt(struct rq *rq)
-{
-	requeue_task_rt(rq, rq->curr, 0);
-}
-
-#ifdef CONFIG_SMP
-static int find_lowest_rq(struct task_struct *task);
-
-static int
-select_task_rq_rt(struct task_struct *p, int sd_flag, int flags)
-{
-	struct task_struct *curr;
-	struct rq *rq;
-	int cpu;
-
-	cpu = task_cpu(p);
-
-	/* For anything but wake ups, just return the task_cpu */
-	if (sd_flag != SD_BALANCE_WAKE && sd_flag != SD_BALANCE_FORK)
-		goto out;
-
-	rq = cpu_rq(cpu);
-
-	rcu_read_lock();
-	curr = ACCESS_ONCE(rq->curr); /* unlocked access */
-
-	/*
-	 * If the current task on @p's runqueue is an RT task, then
-	 * try to see if we can wake this RT task up on another
-	 * runqueue. Otherwise simply start this RT task
-	 * on its current runqueue.
-	 *
-	 * We want to avoid overloading runqueues. If the woken
-	 * task is a higher priority, then it will stay on this CPU
-	 * and the lower prio task should be moved to another CPU.
-	 * Even though this will probably make the lower prio task
-	 * lose its cache, we do not want to bounce a higher task
-	 * around just because it gave up its CPU, perhaps for a
-	 * lock?
-	 *
-	 * For equal prio tasks, we just let the scheduler sort it out.
-	 *
-	 * Otherwise, just let it ride on the affined RQ and the
-	 * post-schedule router will push the preempted task away
-	 *
-	 * This test is optimistic, if we get it wrong the load-balancer
-	 * will have to sort it out.
-	 */
-	if (curr && unlikely(rt_task(curr)) &&
-	    (curr->rt.nr_cpus_allowed < 2 ||
-	     curr->prio <= p->prio) &&
-	    (p->rt.nr_cpus_allowed > 1)) {
-		int target = find_lowest_rq(p);
-
-		if (target != -1)
-			cpu = target;
-	}
-	rcu_read_unlock();
-
-out:
-	return cpu;
-}
-
-static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p)
-{
-	if (rq->curr->rt.nr_cpus_allowed == 1)
-		return;
-
-	if (p->rt.nr_cpus_allowed != 1
-	    && cpupri_find(&rq->rd->cpupri, p, NULL))
-		return;
-
-	if (!cpupri_find(&rq->rd->cpupri, rq->curr, NULL))
-		return;
-
-	/*
-	 * There appears to be other cpus that can accept
-	 * current and none to run 'p', so lets reschedule
-	 * to try and push current away:
-	 */
-	requeue_task_rt(rq, p, 1);
-	resched_task(rq->curr);
-}
-
-#endif /* CONFIG_SMP */
-
-/*
- * Preempt the current task with a newly woken task if needed:
- */
-static void check_preempt_curr_rt(struct rq *rq, struct task_struct *p, int flags)
-{
-	if (p->prio < rq->curr->prio) {
-		resched_task(rq->curr);
-		return;
-	}
-
-#ifdef CONFIG_SMP
-	/*
-	 * If:
-	 *
-	 * - the newly woken task is of equal priority to the current task
-	 * - the newly woken task is non-migratable while current is migratable
-	 * - current will be preempted on the next reschedule
-	 *
-	 * we should check to see if current can readily move to a different
-	 * cpu.  If so, we will reschedule to allow the push logic to try
-	 * to move current somewhere else, making room for our non-migratable
-	 * task.
-	 */
-	if (p->prio == rq->curr->prio && !test_tsk_need_resched(rq->curr))
-		check_preempt_equal_prio(rq, p);
-#endif
-}
-
-static struct sched_rt_entity *pick_next_rt_entity(struct rq *rq,
-						   struct rt_rq *rt_rq)
-{
-	struct rt_prio_array *array = &rt_rq->active;
-	struct sched_rt_entity *next = NULL;
-	struct list_head *queue;
-	int idx;
-
-	idx = sched_find_first_bit(array->bitmap);
-	BUG_ON(idx >= MAX_RT_PRIO);
-
-	queue = array->queue + idx;
-	next = list_entry(queue->next, struct sched_rt_entity, run_list);
-
-	return next;
-}
-
-static struct task_struct *_pick_next_task_rt(struct rq *rq)
-{
-	struct sched_rt_entity *rt_se;
-	struct task_struct *p;
-	struct rt_rq *rt_rq;
-
-	rt_rq = &rq->rt;
-
-	if (!rt_rq->rt_nr_running)
-		return NULL;
-
-	if (rt_rq_throttled(rt_rq))
-		return NULL;
-
-	do {
-		rt_se = pick_next_rt_entity(rq, rt_rq);
-		BUG_ON(!rt_se);
-		rt_rq = group_rt_rq(rt_se);
-	} while (rt_rq);
-
-	p = rt_task_of(rt_se);
-	p->se.exec_start = rq->clock_task;
-
-	return p;
-}
-
-static struct task_struct *pick_next_task_rt(struct rq *rq)
-{
-	struct task_struct *p = _pick_next_task_rt(rq);
-
-	/* The running task is never eligible for pushing */
-	if (p)
-		dequeue_pushable_task(rq, p);
-
-#ifdef CONFIG_SMP
-	/*
-	 * We detect this state here so that we can avoid taking the RQ
-	 * lock again later if there is no need to push
-	 */
-	rq->post_schedule = has_pushable_tasks(rq);
-#endif
-
-	return p;
-}
-
-static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
-{
-	update_curr_rt(rq);
-
-	/*
-	 * The previous task needs to be made eligible for pushing
-	 * if it is still active
-	 */
-	if (on_rt_rq(&p->rt) && p->rt.nr_cpus_allowed > 1)
-		enqueue_pushable_task(rq, p);
-}
-
-#ifdef CONFIG_SMP
-
-/* Only try algorithms three times */
-#define RT_MAX_TRIES 3
-
-static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
-{
-	if (!task_running(rq, p) &&
-	    (cpu < 0 || cpumask_test_cpu(cpu, tsk_cpus_allowed(p))) &&
-	    (p->rt.nr_cpus_allowed > 1))
-		return 1;
-	return 0;
-}
-
-/* Return the second highest RT task, NULL otherwise */
-static struct task_struct *pick_next_highest_task_rt(struct rq *rq, int cpu)
-{
-	struct task_struct *next = NULL;
-	struct sched_rt_entity *rt_se;
-	struct rt_prio_array *array;
-	struct rt_rq *rt_rq;
-	int idx;
-
-	for_each_leaf_rt_rq(rt_rq, rq) {
-		array = &rt_rq->active;
-		idx = sched_find_first_bit(array->bitmap);
-next_idx:
-		if (idx >= MAX_RT_PRIO)
-			continue;
-		if (next && next->prio < idx)
-			continue;
-		list_for_each_entry(rt_se, array->queue + idx, run_list) {
-			struct task_struct *p;
-
-			if (!rt_entity_is_task(rt_se))
-				continue;
-
-			p = rt_task_of(rt_se);
-			if (pick_rt_task(rq, p, cpu)) {
-				next = p;
-				break;
-			}
-		}
-		if (!next) {
-			idx = find_next_bit(array->bitmap, MAX_RT_PRIO, idx+1);
-			goto next_idx;
-		}
-	}
-
-	return next;
-}
-
-static DEFINE_PER_CPU(cpumask_var_t, local_cpu_mask);
-
-static int find_lowest_rq(struct task_struct *task)
-{
-	struct sched_domain *sd;
-	struct cpumask *lowest_mask = __get_cpu_var(local_cpu_mask);
-	int this_cpu = smp_processor_id();
-	int cpu      = task_cpu(task);
-
-	/* Make sure the mask is initialized first */
-	if (unlikely(!lowest_mask))
-		return -1;
-
-	if (task->rt.nr_cpus_allowed == 1)
-		return -1; /* No other targets possible */
-
-	if (!cpupri_find(&task_rq(task)->rd->cpupri, task, lowest_mask))
-		return -1; /* No targets found */
-
-	/*
-	 * At this point we have built a mask of cpus representing the
-	 * lowest priority tasks in the system.  Now we want to elect
-	 * the best one based on our affinity and topology.
-	 *
-	 * We prioritize the last cpu that the task executed on since
-	 * it is most likely cache-hot in that location.
-	 */
-	if (cpumask_test_cpu(cpu, lowest_mask))
-		return cpu;
-
-	/*
-	 * Otherwise, we consult the sched_domains span maps to figure
-	 * out which cpu is logically closest to our hot cache data.
-	 */
-	if (!cpumask_test_cpu(this_cpu, lowest_mask))
-		this_cpu = -1; /* Skip this_cpu opt if not among lowest */
-
-	rcu_read_lock();
-	for_each_domain(cpu, sd) {
-		if (sd->flags & SD_WAKE_AFFINE) {
-			int best_cpu;
-
-			/*
-			 * "this_cpu" is cheaper to preempt than a
-			 * remote processor.
-			 */
-			if (this_cpu != -1 &&
-			    cpumask_test_cpu(this_cpu, sched_domain_span(sd))) {
-				rcu_read_unlock();
-				return this_cpu;
-			}
-
-			best_cpu = cpumask_first_and(lowest_mask,
-						     sched_domain_span(sd));
-			if (best_cpu < nr_cpu_ids) {
-				rcu_read_unlock();
-				return best_cpu;
-			}
-		}
-	}
-	rcu_read_unlock();
-
-	/*
-	 * And finally, if there were no matches within the domains
-	 * just give the caller *something* to work with from the compatible
-	 * locations.
-	 */
-	if (this_cpu != -1)
-		return this_cpu;
-
-	cpu = cpumask_any(lowest_mask);
-	if (cpu < nr_cpu_ids)
-		return cpu;
-	return -1;
-}
-
-/* Will lock the rq it finds */
-static struct rq *find_lock_lowest_rq(struct task_struct *task, struct rq *rq)
-{
-	struct rq *lowest_rq = NULL;
-	int tries;
-	int cpu;
-
-	for (tries = 0; tries < RT_MAX_TRIES; tries++) {
-		cpu = find_lowest_rq(task);
-
-		if ((cpu == -1) || (cpu == rq->cpu))
-			break;
-
-		lowest_rq = cpu_rq(cpu);
-
-		/* if the prio of this runqueue changed, try again */
-		if (double_lock_balance(rq, lowest_rq)) {
-			/*
-			 * We had to unlock the run queue. In
-			 * the mean time, task could have
-			 * migrated already or had its affinity changed.
-			 * Also make sure that it wasn't scheduled on its rq.
-			 */
-			if (unlikely(task_rq(task) != rq ||
-				     !cpumask_test_cpu(lowest_rq->cpu,
-						       tsk_cpus_allowed(task)) ||
-				     task_running(rq, task) ||
-				     !task->on_rq)) {
-
-				raw_spin_unlock(&lowest_rq->lock);
-				lowest_rq = NULL;
-				break;
-			}
-		}
-
-		/* If this rq is still suitable use it. */
-		if (lowest_rq->rt.highest_prio.curr > task->prio)
-			break;
-
-		/* try again */
-		double_unlock_balance(rq, lowest_rq);
-		lowest_rq = NULL;
-	}
-
-	return lowest_rq;
-}
-
-static struct task_struct *pick_next_pushable_task(struct rq *rq)
-{
-	struct task_struct *p;
-
-	if (!has_pushable_tasks(rq))
-		return NULL;
-
-	p = plist_first_entry(&rq->rt.pushable_tasks,
-			      struct task_struct, pushable_tasks);
-
-	BUG_ON(rq->cpu != task_cpu(p));
-	BUG_ON(task_current(rq, p));
-	BUG_ON(p->rt.nr_cpus_allowed <= 1);
-
-	BUG_ON(!p->on_rq);
-	BUG_ON(!rt_task(p));
-
-	return p;
-}
-
-/*
- * If the current CPU has more than one RT task, see if the non
- * running task can migrate over to a CPU that is running a task
- * of lesser priority.
- */
-static int push_rt_task(struct rq *rq)
-{
-	struct task_struct *next_task;
-	struct rq *lowest_rq;
-	int ret = 0;
-
-	if (!rq->rt.overloaded)
-		return 0;
-
-	next_task = pick_next_pushable_task(rq);
-	if (!next_task)
-		return 0;
-
-retry:
-	if (unlikely(next_task == rq->curr)) {
-		WARN_ON(1);
-		return 0;
-	}
-
-	/*
-	 * It's possible that the next_task slipped in of
-	 * higher priority than current. If that's the case
-	 * just reschedule current.
-	 */
-	if (unlikely(next_task->prio < rq->curr->prio)) {
-		resched_task(rq->curr);
-		return 0;
-	}
-
-	/* We might release rq lock */
-	get_task_struct(next_task);
-
-	/* find_lock_lowest_rq locks the rq if found */
-	lowest_rq = find_lock_lowest_rq(next_task, rq);
-	if (!lowest_rq) {
-		struct task_struct *task;
-		/*
-		 * find_lock_lowest_rq releases rq->lock
-		 * so it is possible that next_task has migrated.
-		 *
-		 * We need to make sure that the task is still on the same
-		 * run-queue and is also still the next task eligible for
-		 * pushing.
-		 */
-		task = pick_next_pushable_task(rq);
-		if (task_cpu(next_task) == rq->cpu && task == next_task) {
-			/*
-			 * The task hasn't migrated, and is still the next
-			 * eligible task, but we failed to find a run-queue
-			 * to push it to.  Do not retry in this case, since
-			 * other cpus will pull from us when ready.
-			 */
-			goto out;
-		}
-
-		if (!task)
-			/* No more tasks, just exit */
-			goto out;
-
-		/*
-		 * Something has shifted, try again.
-		 */
-		put_task_struct(next_task);
-		next_task = task;
-		goto retry;
-	}
-
-	deactivate_task(rq, next_task, 0);
-	set_task_cpu(next_task, lowest_rq->cpu);
-	activate_task(lowest_rq, next_task, 0);
-	ret = 1;
-
-	resched_task(lowest_rq->curr);
-
-	double_unlock_balance(rq, lowest_rq);
-
-out:
-	put_task_struct(next_task);
-
-	return ret;
-}
-
-static void push_rt_tasks(struct rq *rq)
-{
-	/* push_rt_task will return true if it moved an RT */
-	while (push_rt_task(rq))
-		;
-}
-
-static int pull_rt_task(struct rq *this_rq)
-{
-	int this_cpu = this_rq->cpu, ret = 0, cpu;
-	struct task_struct *p;
-	struct rq *src_rq;
-
-	if (likely(!rt_overloaded(this_rq)))
-		return 0;
-
-	for_each_cpu(cpu, this_rq->rd->rto_mask) {
-		if (this_cpu == cpu)
-			continue;
-
-		src_rq = cpu_rq(cpu);
-
-		/*
-		 * Don't bother taking the src_rq->lock if the next highest
-		 * task is known to be lower-priority than our current task.
-		 * This may look racy, but if this value is about to go
-		 * logically higher, the src_rq will push this task away.
-		 * And if its going logically lower, we do not care
-		 */
-		if (src_rq->rt.highest_prio.next >=
-		    this_rq->rt.highest_prio.curr)
-			continue;
-
-		/*
-		 * We can potentially drop this_rq's lock in
-		 * double_lock_balance, and another CPU could
-		 * alter this_rq
-		 */
-		double_lock_balance(this_rq, src_rq);
-
-		/*
-		 * Are there still pullable RT tasks?
-		 */
-		if (src_rq->rt.rt_nr_running <= 1)
-			goto skip;
-
-		p = pick_next_highest_task_rt(src_rq, this_cpu);
-
-		/*
-		 * Do we have an RT task that preempts
-		 * the to-be-scheduled task?
-		 */
-		if (p && (p->prio < this_rq->rt.highest_prio.curr)) {
-			WARN_ON(p == src_rq->curr);
-			WARN_ON(!p->on_rq);
-
-			/*
-			 * There's a chance that p is higher in priority
-			 * than what's currently running on its cpu.
-			 * This is just that p is wakeing up and hasn't
-			 * had a chance to schedule. We only pull
-			 * p if it is lower in priority than the
-			 * current task on the run queue
-			 */
-			if (p->prio < src_rq->curr->prio)
-				goto skip;
-
-			ret = 1;
-
-			deactivate_task(src_rq, p, 0);
-			set_task_cpu(p, this_cpu);
-			activate_task(this_rq, p, 0);
-			/*
-			 * We continue with the search, just in
-			 * case there's an even higher prio task
-			 * in another runqueue. (low likelihood
-			 * but possible)
-			 */
-		}
-skip:
-		double_unlock_balance(this_rq, src_rq);
-	}
-
-	return ret;
-}
-
-static void pre_schedule_rt(struct rq *rq, struct task_struct *prev)
-{
-	/* Try to pull RT tasks here if we lower this rq's prio */
-	if (rq->rt.highest_prio.curr > prev->prio)
-		pull_rt_task(rq);
-}
-
-static void post_schedule_rt(struct rq *rq)
-{
-	push_rt_tasks(rq);
-}
-
-/*
- * If we are not running and we are not going to reschedule soon, we should
- * try to push tasks away now
- */
-static void task_woken_rt(struct rq *rq, struct task_struct *p)
-{
-	if (!task_running(rq, p) &&
-	    !test_tsk_need_resched(rq->curr) &&
-	    has_pushable_tasks(rq) &&
-	    p->rt.nr_cpus_allowed > 1 &&
-	    rt_task(rq->curr) &&
-	    (rq->curr->rt.nr_cpus_allowed < 2 ||
-	     rq->curr->prio <= p->prio))
-		push_rt_tasks(rq);
-}
-
-static void set_cpus_allowed_rt(struct task_struct *p,
-				const struct cpumask *new_mask)
-{
-	int weight = cpumask_weight(new_mask);
-
-	BUG_ON(!rt_task(p));
-
-	/*
-	 * Update the migration status of the RQ if we have an RT task
-	 * which is running AND changing its weight value.
-	 */
-	if (p->on_rq && (weight != p->rt.nr_cpus_allowed)) {
-		struct rq *rq = task_rq(p);
-
-		if (!task_current(rq, p)) {
-			/*
-			 * Make sure we dequeue this task from the pushable list
-			 * before going further.  It will either remain off of
-			 * the list because we are no longer pushable, or it
-			 * will be requeued.
-			 */
-			if (p->rt.nr_cpus_allowed > 1)
-				dequeue_pushable_task(rq, p);
-
-			/*
-			 * Requeue if our weight is changing and still > 1
-			 */
-			if (weight > 1)
-				enqueue_pushable_task(rq, p);
-
-		}
-
-		if ((p->rt.nr_cpus_allowed <= 1) && (weight > 1)) {
-			rq->rt.rt_nr_migratory++;
-		} else if ((p->rt.nr_cpus_allowed > 1) && (weight <= 1)) {
-			BUG_ON(!rq->rt.rt_nr_migratory);
-			rq->rt.rt_nr_migratory--;
-		}
-
-		update_rt_migration(&rq->rt);
-	}
-}
-
-/* Assumes rq->lock is held */
-static void rq_online_rt(struct rq *rq)
-{
-	if (rq->rt.overloaded)
-		rt_set_overload(rq);
-
-	__enable_runtime(rq);
-
-	cpupri_set(&rq->rd->cpupri, rq->cpu, rq->rt.highest_prio.curr);
-}
-
-/* Assumes rq->lock is held */
-static void rq_offline_rt(struct rq *rq)
-{
-	if (rq->rt.overloaded)
-		rt_clear_overload(rq);
-
-	__disable_runtime(rq);
-
-	cpupri_set(&rq->rd->cpupri, rq->cpu, CPUPRI_INVALID);
-}
-
-/*
- * When switch from the rt queue, we bring ourselves to a position
- * that we might want to pull RT tasks from other runqueues.
- */
-static void switched_from_rt(struct rq *rq, struct task_struct *p)
-{
-	/*
-	 * If there are other RT tasks then we will reschedule
-	 * and the scheduling of the other RT tasks will handle
-	 * the balancing. But if we are the last RT task
-	 * we may need to handle the pulling of RT tasks
-	 * now.
-	 */
-	if (p->on_rq && !rq->rt.rt_nr_running)
-		pull_rt_task(rq);
-}
-
-void init_sched_rt_class(void)
-{
-	unsigned int i;
-
-	for_each_possible_cpu(i) {
-		zalloc_cpumask_var_node(&per_cpu(local_cpu_mask, i),
-					GFP_KERNEL, cpu_to_node(i));
-	}
-}
-#endif /* CONFIG_SMP */
-
-/*
- * When switching a task to RT, we may overload the runqueue
- * with RT tasks. In this case we try to push them off to
- * other runqueues.
- */
-static void switched_to_rt(struct rq *rq, struct task_struct *p)
-{
-	int check_resched = 1;
-
-	/*
-	 * If we are already running, then there's nothing
-	 * that needs to be done. But if we are not running
-	 * we may need to preempt the current running task.
-	 * If that current running task is also an RT task
-	 * then see if we can move to another run queue.
-	 */
-	if (p->on_rq && rq->curr != p) {
-#ifdef CONFIG_SMP
-		if (rq->rt.overloaded && push_rt_task(rq) &&
-		    /* Don't resched if we changed runqueues */
-		    rq != task_rq(p))
-			check_resched = 0;
-#endif /* CONFIG_SMP */
-		if (check_resched && p->prio < rq->curr->prio)
-			resched_task(rq->curr);
-	}
-}
-
-/*
- * Priority of the task has changed. This may cause
- * us to initiate a push or pull.
- */
-static void
-prio_changed_rt(struct rq *rq, struct task_struct *p, int oldprio)
-{
-	if (!p->on_rq)
-		return;
-
-	if (rq->curr == p) {
-#ifdef CONFIG_SMP
-		/*
-		 * If our priority decreases while running, we
-		 * may need to pull tasks to this runqueue.
-		 */
-		if (oldprio < p->prio)
-			pull_rt_task(rq);
-		/*
-		 * If there's a higher priority task waiting to run
-		 * then reschedule. Note, the above pull_rt_task
-		 * can release the rq lock and p could migrate.
-		 * Only reschedule if p is still on the same runqueue.
-		 */
-		if (p->prio > rq->rt.highest_prio.curr && rq->curr == p)
-			resched_task(p);
-#else
-		/* For UP simply resched on drop of prio */
-		if (oldprio < p->prio)
-			resched_task(p);
-#endif /* CONFIG_SMP */
-	} else {
-		/*
-		 * This task is not running, but if it is
-		 * greater than the current running task
-		 * then reschedule.
-		 */
-		if (p->prio < rq->curr->prio)
-			resched_task(rq->curr);
-	}
-}
-
-static void watchdog(struct rq *rq, struct task_struct *p)
-{
-	unsigned long soft, hard;
-
-	/* max may change after cur was read, this will be fixed next tick */
-	soft = task_rlimit(p, RLIMIT_RTTIME);
-	hard = task_rlimit_max(p, RLIMIT_RTTIME);
-
-	if (soft != RLIM_INFINITY) {
-		unsigned long next;
-
-		p->rt.timeout++;
-		next = DIV_ROUND_UP(min(soft, hard), USEC_PER_SEC/HZ);
-		if (p->rt.timeout > next)
-			p->cputime_expires.sched_exp = p->se.sum_exec_runtime;
-	}
-}
-
-static void task_tick_rt(struct rq *rq, struct task_struct *p, int queued)
-{
-	update_curr_rt(rq);
-
-	watchdog(rq, p);
-
-	/*
-	 * RR tasks need a special form of timeslice management.
-	 * FIFO tasks have no timeslices.
-	 */
-	if (p->policy != SCHED_RR)
-		return;
-
-	if (--p->rt.time_slice)
-		return;
-
-	p->rt.time_slice = DEF_TIMESLICE;
-
-	/*
-	 * Requeue to the end of queue if we are not the only element
-	 * on the queue:
-	 */
-	if (p->rt.run_list.prev != p->rt.run_list.next) {
-		requeue_task_rt(rq, p, 0);
-		set_tsk_need_resched(p);
-	}
-}
-
-static void set_curr_task_rt(struct rq *rq)
-{
-	struct task_struct *p = rq->curr;
-
-	p->se.exec_start = rq->clock_task;
-
-	/* The running task is never eligible for pushing */
-	dequeue_pushable_task(rq, p);
-}
-
-static unsigned int get_rr_interval_rt(struct rq *rq, struct task_struct *task)
-{
-	/*
-	 * Time slice is 0 for SCHED_FIFO tasks
-	 */
-	if (task->policy == SCHED_RR)
-		return DEF_TIMESLICE;
-	else
-		return 0;
-}
-
-const struct sched_class rt_sched_class = {
-	.next			= &fair_sched_class,
-	.enqueue_task		= enqueue_task_rt,
-	.dequeue_task		= dequeue_task_rt,
-	.yield_task		= yield_task_rt,
-
-	.check_preempt_curr	= check_preempt_curr_rt,
-
-	.pick_next_task		= pick_next_task_rt,
-	.put_prev_task		= put_prev_task_rt,
-
-#ifdef CONFIG_SMP
-	.select_task_rq		= select_task_rq_rt,
-
-	.set_cpus_allowed       = set_cpus_allowed_rt,
-	.rq_online              = rq_online_rt,
-	.rq_offline             = rq_offline_rt,
-	.pre_schedule		= pre_schedule_rt,
-	.post_schedule		= post_schedule_rt,
-	.task_woken		= task_woken_rt,
-	.switched_from		= switched_from_rt,
-#endif
-
-	.set_curr_task          = set_curr_task_rt,
-	.task_tick		= task_tick_rt,
-
-	.get_rr_interval	= get_rr_interval_rt,
-
-	.prio_changed		= prio_changed_rt,
-	.switched_to		= switched_to_rt,
-};
-
-#ifdef CONFIG_SCHED_DEBUG
-extern void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq);
-
-void print_rt_stats(struct seq_file *m, int cpu)
-{
-	rt_rq_iter_t iter;
-	struct rt_rq *rt_rq;
-
-	rcu_read_lock();
-	for_each_rt_rq(rt_rq, iter, cpu_rq(cpu))
-		print_rt_rq(m, cpu, rt_rq);
-	rcu_read_unlock();
-}
-#endif /* CONFIG_SCHED_DEBUG */