sched/core: Fix preempt warning in ttwu
John reported a DEBUG_PREEMPT warning caused by commit:aacedf26fb
("sched/core: Optimize try_to_wake_up() for local wakeups") I overlooked that ttwu_stat() requires preemption disabled. Reported-by: John Stultz <john.stultz@linaro.org> Tested-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes:aacedf26fb
("sched/core: Optimize try_to_wake_up() for local wakeups") Link: https://lkml.kernel.org/r/20190710105736.GK3402@hirez.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -2399,6 +2399,7 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
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unsigned long flags;
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int cpu, success = 0;
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preempt_disable();
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if (p == current) {
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/*
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* We're waking current, this means 'p->on_rq' and 'task_cpu(p)
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@ -2412,7 +2413,7 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
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* it disabling IRQs (this allows not taking ->pi_lock).
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*/
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if (!(p->state & state))
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return false;
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goto out;
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success = 1;
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cpu = task_cpu(p);
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@ -2526,6 +2527,7 @@ unlock:
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out:
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if (success)
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ttwu_stat(p, cpu, wake_flags);
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preempt_enable();
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return success;
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}
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