sched/fair: Rename check_preempt_curr() to wakeup_preempt()

The name is a bit opaque - make it clear that this is about wakeup
preemption.

Also rename the ->check_preempt_curr() methods similarly.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

kernel/sched/core.c

@@ -2211,10 +2211,10 @@ static inline void check_class_changed(struct rq *rq, struct task_struct *p,
 		p->sched_class->prio_changed(rq, p, oldprio);
 }
 
-void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags)
+void wakeup_preempt(struct rq *rq, struct task_struct *p, int flags)
 {
 	if (p->sched_class == rq->curr->sched_class)
-		rq->curr->sched_class->check_preempt_curr(rq, p, flags);
+		rq->curr->sched_class->wakeup_preempt(rq, p, flags);
 	else if (sched_class_above(p->sched_class, rq->curr->sched_class))
 		resched_curr(rq);
 
@@ -2508,7 +2508,7 @@ static struct rq *move_queued_task(struct rq *rq, struct rq_flags *rf,
 	rq_lock(rq, rf);
 	WARN_ON_ONCE(task_cpu(p) != new_cpu);
 	activate_task(rq, p, 0);
-	check_preempt_curr(rq, p, 0);
+	wakeup_preempt(rq, p, 0);
 
 	return rq;
 }
@@ -3390,7 +3390,7 @@ static void __migrate_swap_task(struct task_struct *p, int cpu)
 		deactivate_task(src_rq, p, 0);
 		set_task_cpu(p, cpu);
 		activate_task(dst_rq, p, 0);
-		check_preempt_curr(dst_rq, p, 0);
+		wakeup_preempt(dst_rq, p, 0);
 
 		rq_unpin_lock(dst_rq, &drf);
 		rq_unpin_lock(src_rq, &srf);
@@ -3764,7 +3764,7 @@ ttwu_do_activate(struct rq *rq, struct task_struct *p, int wake_flags,
 	}
 
 	activate_task(rq, p, en_flags);
-	check_preempt_curr(rq, p, wake_flags);
+	wakeup_preempt(rq, p, wake_flags);
 
 	ttwu_do_wakeup(p);
 
@@ -3835,7 +3835,7 @@ static int ttwu_runnable(struct task_struct *p, int wake_flags)
 			 * it should preempt the task that is current now.
 			 */
 			update_rq_clock(rq);
-			check_preempt_curr(rq, p, wake_flags);
+			wakeup_preempt(rq, p, wake_flags);
 		}
 		ttwu_do_wakeup(p);
 		ret = 1;
@@ -4854,7 +4854,7 @@ void wake_up_new_task(struct task_struct *p)
 
 	activate_task(rq, p, ENQUEUE_NOCLOCK);
 	trace_sched_wakeup_new(p);
-	check_preempt_curr(rq, p, WF_FORK);
+	wakeup_preempt(rq, p, WF_FORK);
 #ifdef CONFIG_SMP
 	if (p->sched_class->task_woken) {
 		/*

kernel/sched/deadline.c

@@ -763,7 +763,7 @@ static inline void deadline_queue_pull_task(struct rq *rq)
 
 static void enqueue_task_dl(struct rq *rq, struct task_struct *p, int flags);
 static void __dequeue_task_dl(struct rq *rq, struct task_struct *p, int flags);
-static void check_preempt_curr_dl(struct rq *rq, struct task_struct *p, int flags);
+static void wakeup_preempt_dl(struct rq *rq, struct task_struct *p, int flags);
 
 static inline void replenish_dl_new_period(struct sched_dl_entity *dl_se,
 					    struct rq *rq)
@@ -1175,7 +1175,7 @@ static enum hrtimer_restart dl_task_timer(struct hrtimer *timer)
 
 	enqueue_task_dl(rq, p, ENQUEUE_REPLENISH);
 	if (dl_task(rq->curr))
-		check_preempt_curr_dl(rq, p, 0);
+		wakeup_preempt_dl(rq, p, 0);
 	else
 		resched_curr(rq);
 
@@ -1939,7 +1939,7 @@ static int balance_dl(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
  * Only called when both the current and waking task are -deadline
  * tasks.
  */
-static void check_preempt_curr_dl(struct rq *rq, struct task_struct *p,
+static void wakeup_preempt_dl(struct rq *rq, struct task_struct *p,
 				  int flags)
 {
 	if (dl_entity_preempt(&p->dl, &rq->curr->dl)) {
@@ -2652,7 +2652,7 @@ static void switched_to_dl(struct rq *rq, struct task_struct *p)
 			deadline_queue_push_tasks(rq);
 #endif
 		if (dl_task(rq->curr))
-			check_preempt_curr_dl(rq, p, 0);
+			wakeup_preempt_dl(rq, p, 0);
 		else
 			resched_curr(rq);
 	} else {
@@ -2721,7 +2721,7 @@ DEFINE_SCHED_CLASS(dl) = {
 	.dequeue_task		= dequeue_task_dl,
 	.yield_task		= yield_task_dl,
 
-	.check_preempt_curr	= check_preempt_curr_dl,
+	.wakeup_preempt		= wakeup_preempt_dl,
 
 	.pick_next_task		= pick_next_task_dl,
 	.put_prev_task		= put_prev_task_dl,

kernel/sched/fair.c

@@ -8007,7 +8007,7 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int
 
 	/*
 	 * This is possible from callers such as attach_tasks(), in which we
-	 * unconditionally check_preempt_curr() after an enqueue (which may have
+	 * unconditionally wakeup_preempt() after an enqueue (which may have
 	 * lead to a throttle).  This both saves work and prevents false
 	 * next-buddy nomination below.
 	 */
@@ -8914,7 +8914,7 @@ static void attach_task(struct rq *rq, struct task_struct *p)
 
 	WARN_ON_ONCE(task_rq(p) != rq);
 	activate_task(rq, p, ENQUEUE_NOCLOCK);
-	check_preempt_curr(rq, p, 0);
+	wakeup_preempt(rq, p, 0);
 }
 
 /*
@@ -12369,7 +12369,7 @@ prio_changed_fair(struct rq *rq, struct task_struct *p, int oldprio)
 		if (p->prio > oldprio)
 			resched_curr(rq);
 	} else
-		check_preempt_curr(rq, p, 0);
+		wakeup_preempt(rq, p, 0);
 }
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
@@ -12471,7 +12471,7 @@ static void switched_to_fair(struct rq *rq, struct task_struct *p)
 		if (task_current(rq, p))
 			resched_curr(rq);
 		else
-			check_preempt_curr(rq, p, 0);
+			wakeup_preempt(rq, p, 0);
 	}
 }
 
@@ -12830,7 +12830,7 @@ DEFINE_SCHED_CLASS(fair) = {
 	.yield_task		= yield_task_fair,
 	.yield_to_task		= yield_to_task_fair,
 
-	.check_preempt_curr	= check_preempt_wakeup_fair,
+	.wakeup_preempt		= check_preempt_wakeup_fair,
 
 	.pick_next_task		= __pick_next_task_fair,
 	.put_prev_task		= put_prev_task_fair,

kernel/sched/idle.c

@@ -400,7 +400,7 @@ balance_idle(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
 /*
  * Idle tasks are unconditionally rescheduled:
  */
-static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p, int flags)
+static void wakeup_preempt_idle(struct rq *rq, struct task_struct *p, int flags)
 {
 	resched_curr(rq);
 }
@@ -481,7 +481,7 @@ DEFINE_SCHED_CLASS(idle) = {
 	/* dequeue is not valid, we print a debug message there: */
 	.dequeue_task		= dequeue_task_idle,
 
-	.check_preempt_curr	= check_preempt_curr_idle,
+	.wakeup_preempt		= wakeup_preempt_idle,
 
 	.pick_next_task		= pick_next_task_idle,
 	.put_prev_task		= put_prev_task_idle,

kernel/sched/rt.c

@@ -953,7 +953,7 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
 
 				/*
 				 * When we're idle and a woken (rt) task is
-				 * throttled check_preempt_curr() will set
+				 * throttled wakeup_preempt() will set
 				 * skip_update and the time between the wakeup
 				 * and this unthrottle will get accounted as
 				 * 'runtime'.
@@ -1715,7 +1715,7 @@ static int balance_rt(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
 /*
  * 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)
+static void wakeup_preempt_rt(struct rq *rq, struct task_struct *p, int flags)
 {
 	if (p->prio < rq->curr->prio) {
 		resched_curr(rq);
@@ -2702,7 +2702,7 @@ DEFINE_SCHED_CLASS(rt) = {
 	.dequeue_task		= dequeue_task_rt,
 	.yield_task		= yield_task_rt,
 
-	.check_preempt_curr	= check_preempt_curr_rt,
+	.wakeup_preempt		= wakeup_preempt_rt,
 
 	.pick_next_task		= pick_next_task_rt,
 	.put_prev_task		= put_prev_task_rt,

kernel/sched/sched.h

@@ -2236,7 +2236,7 @@ struct sched_class {
 	void (*yield_task)   (struct rq *rq);
 	bool (*yield_to_task)(struct rq *rq, struct task_struct *p);
 
-	void (*check_preempt_curr)(struct rq *rq, struct task_struct *p, int flags);
+	void (*wakeup_preempt)(struct rq *rq, struct task_struct *p, int flags);
 
 	struct task_struct *(*pick_next_task)(struct rq *rq);
 
@@ -2510,7 +2510,7 @@ static inline void sub_nr_running(struct rq *rq, unsigned count)
 extern void activate_task(struct rq *rq, struct task_struct *p, int flags);
 extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags);
 
-extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags);
+extern void wakeup_preempt(struct rq *rq, struct task_struct *p, int flags);
 
 #ifdef CONFIG_PREEMPT_RT
 #define SCHED_NR_MIGRATE_BREAK 8

kernel/sched/stop_task.c

@@ -23,7 +23,7 @@ balance_stop(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
 #endif /* CONFIG_SMP */
 
 static void
-check_preempt_curr_stop(struct rq *rq, struct task_struct *p, int flags)
+wakeup_preempt_stop(struct rq *rq, struct task_struct *p, int flags)
 {
 	/* we're never preempted */
 }
@@ -120,7 +120,7 @@ DEFINE_SCHED_CLASS(stop) = {
 	.dequeue_task		= dequeue_task_stop,
 	.yield_task		= yield_task_stop,
 
-	.check_preempt_curr	= check_preempt_curr_stop,
+	.wakeup_preempt		= wakeup_preempt_stop,
 
 	.pick_next_task		= pick_next_task_stop,
 	.put_prev_task		= put_prev_task_stop,