linux-kernel - [GIT PULL] scheduler fix

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Message-ID: <20190714101910.GA127043@gmail.com>
Date:   Sun, 14 Jul 2019 12:19:10 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT PULL] scheduler fix

Linus,

Please pull the latest sched-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-urgent-for-linus

   # HEAD: e3d85487fba42206024bc3ed32e4b581c7cb46db sched/core: Fix preempt warning in ttwu

Fix a sched statistics related bug that would trigger a kernel warning on 
certain configs.

 Thanks,

	Ingo

------------------>
Peter Zijlstra (1):
      sched/core: Fix preempt warning in ttwu


 kernel/sched/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index fa43ce3962e7..2b037f195473 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2399,6 +2399,7 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
 	unsigned long flags;
 	int cpu, success = 0;
 
+	preempt_disable();
 	if (p == current) {
 		/*
 		 * We're waking current, this means 'p->on_rq' and 'task_cpu(p)
@@ -2412,7 +2413,7 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
 		 *    it disabling IRQs (this allows not taking ->pi_lock).
 		 */
 		if (!(p->state & state))
-			return false;
+			goto out;
 
 		success = 1;
 		cpu = task_cpu(p);
@@ -2526,6 +2527,7 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
 out:
 	if (success)
 		ttwu_stat(p, cpu, wake_flags);
+	preempt_enable();
 
 	return success;
 }