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watchdog: Mark watchdog_hrtimer to expire in hard interrupt context 

The watchdog hrtimer must expire in hard interrupt context even on
PREEMPT_RT=y kernels as otherwise the hard/softlockup detection logic would
not work.

No functional change.

[ tglx: Split out from larger combo patch. Added changelog ]

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20190726185753.262895510@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2019-07-26 20:30:54 +02:00 committed by Thomas Gleixner
parent 30f9028b6c
commit d2ab4cf494
1 changed files with 2 additions and 2 deletions
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4
kernel/watchdog.c
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@ -490,10 +490,10 @@ static void watchdog_enable(unsigned int cpu)
* Start the timer first to prevent the NMI watchdog triggering * Start the timer first to prevent the NMI watchdog triggering
* before the timer has a chance to fire. * before the timer has a chance to fire.
*/ */
hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
hrtimer->function = watchdog_timer_fn; hrtimer->function = watchdog_timer_fn;
hrtimer_start(hrtimer, ns_to_ktime(sample_period), hrtimer_start(hrtimer, ns_to_ktime(sample_period),
HRTIMER_MODE_REL_PINNED); HRTIMER_MODE_REL_PINNED_HARD);
/* Initialize timestamp */ /* Initialize timestamp */
__touch_watchdog(); __touch_watchdog();