From 7c25904508afef134d7a9d2ad1690ee6554a1faa Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Mon, 15 May 2017 14:56:50 +0200 Subject: [PATCH] nohz: Reset next_tick cache even when the timer has no regs Handle tick interrupts whose regs are NULL, out of general paranoia. It happens when hrtimer_interrupt() is called from non-interrupt contexts, such as hotplug CPU down events. Signed-off-by: Frederic Weisbecker Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar --- kernel/time/tick-sched.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 764d2905e6a5..e3043873fcdc 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -1202,6 +1202,8 @@ static enum hrtimer_restart tick_sched_timer(struct hrtimer *timer) */ if (regs) tick_sched_handle(ts, regs); + else + ts->next_tick = 0; /* No need to reprogram if we are in idle or full dynticks mode */ if (unlikely(ts->tick_stopped)) -- 2.20.1