[tip: sched/core] sched: Simplify wake_up_if_idle()

[tip-bot2 for Peter Zijlstra]

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     4eb054f92b066ec0a0cba6896ee8eff4c91dfc9e
Gitweb:        https://git.kernel.org/tip/4eb054f92b066ec0a0cba6896ee8eff4c91dfc9e
Author:        Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate:    Tue, 01 Aug 2023 22:41:25 +02:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Mon, 14 Aug 2023 17:01:25 +02:00

sched: Simplify wake_up_if_idle()

Use guards to reduce gotos and simplify control flow.

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Valentin Schneider <vschneid@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230801211812.032678917@xxxxxxxxxxxxx
---
 kernel/sched/core.c  | 20 ++++++--------------
 kernel/sched/sched.h | 15 +++++++++++++++
 2 files changed, 21 insertions(+), 14 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 66478a6..65ebf43 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3939,21 +3939,13 @@ static void __ttwu_queue_wakelist(struct task_struct *p, int cpu, int wake_flags
 void wake_up_if_idle(int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
-	struct rq_flags rf;
-
-	rcu_read_lock();
 
-	if (!is_idle_task(rcu_dereference(rq->curr)))
-		goto out;
-
-	rq_lock_irqsave(rq, &rf);
-	if (is_idle_task(rq->curr))
-		resched_curr(rq);
-	/* Else CPU is not idle, do nothing here: */
-	rq_unlock_irqrestore(rq, &rf);
-
-out:
-	rcu_read_unlock();
+	guard(rcu)();
+	if (is_idle_task(rcu_dereference(rq->curr))) {
+		guard(rq_lock_irqsave)(rq);
+		if (is_idle_task(rq->curr))
+			resched_curr(rq);
+	}
 }
 
 bool cpus_share_cache(int this_cpu, int that_cpu)
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index c299a58..3a01b7a 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1705,6 +1705,21 @@ rq_unlock(struct rq *rq, struct rq_flags *rf)
 	raw_spin_rq_unlock(rq);
 }
 
+DEFINE_LOCK_GUARD_1(rq_lock, struct rq,
+		    rq_lock(_T->lock, &_T->rf),
+		    rq_unlock(_T->lock, &_T->rf),
+		    struct rq_flags rf)
+
+DEFINE_LOCK_GUARD_1(rq_lock_irq, struct rq,
+		    rq_lock_irq(_T->lock, &_T->rf),
+		    rq_unlock_irq(_T->lock, &_T->rf),
+		    struct rq_flags rf)
+
+DEFINE_LOCK_GUARD_1(rq_lock_irqsave, struct rq,
+		    rq_lock_irqsave(_T->lock, &_T->rf),
+		    rq_unlock_irqrestore(_T->lock, &_T->rf),
+		    struct rq_flags rf)
+
 static inline struct rq *
 this_rq_lock_irq(struct rq_flags *rf)
 	__acquires(rq->lock)