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Commit 8ac49070 authored by Joonwoo Park's avatar Joonwoo Park
Browse files

sched: prevent race where update CPU cycles 



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: default avatarJoonwoo Park <joonwoop@codeaurora.org>
parent 116f3444

kernel/sched/core.c

+5 −1
Original line number Diff line number Diff line
@@ -3039,8 +3039,12 @@ 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)