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nohz: Reset next_tick cache even when the timer has no regs

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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 <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Frederic Weisbecker 2017-05-15 14:56:50 +02:00 committed by Ingo Molnar
parent 411fe24e6b
commit 7c25904508
1 changed files with 2 additions and 0 deletions
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kernel/time/tick-sched.c
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@ -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))