evie/android_kernel_oneplus_msm8998
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sched: prevent race where update CPU cycles

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Updating cycle counter should be serialized by holding rq lock.
Add missing rq lock hold when cycle counter is updated by irq entry
point.

Change-Id: I92cf75d047a45ebf15a6ddeeecf8fc3823f96e5d
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
This commit is contained in:
Joonwoo Park 2016-06-17 14:46:50 -07:00 • committed by Kyle Yan
parent 14ac5ed8b8
commit 47c31979a1
1 changed files with 5 additions and 1 deletions
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6
kernel/sched/core.c
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@ -3024,8 +3024,12 @@ void sched_account_irqstart(int cpu, struct task_struct *curr, u64 wallclock)
if (!rq->window_start || sched_disable_window_stats)
return;
if (is_idle_task(curr) && use_cycle_counter)
if (is_idle_task(curr)) {
/* We're here without rq->lock held, IRQ disabled */
raw_spin_lock(&rq->lock);
update_task_cpu_cycles(curr, cpu);
raw_spin_unlock(&rq->lock);
}
}
static void reset_task_stats(struct task_struct *p)