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watchdog: Mark watchdog_hrtimer to expire in hard interrupt context

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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 <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
This commit is contained in:
Sebastian Andrzej Siewior authored and Thomas Gleixner committed 2019-08-01 20:51:20 +02:00
1 parent 30f9028b6c
commit d2ab4cf494
1 file changed
+2 -2
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kernel/watchdog.c
+2 -2
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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
* 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_start(hrtimer, ns_to_ktime(sample_period),
HRTIMER_MODE_REL_PINNED);
HRTIMER_MODE_REL_PINNED_HARD);
/* Initialize timestamp */
__touch_watchdog();