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tick: Prefer a lower rating device only if it's CPU local device

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Checking the equality of cpumask for both new and old tick device doesn't
ensure that it's CPU local device. This will cause issue if a low rating
clockevent tick device is registered first followed by the registration
of higher rating clockevent tick device.

In such case, clockevents_released list will never get emptied as both
the devices get selected as preferred one and we will loop forever in
clockevents_notify_released.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: https://lkml.kernel.org/r/1525881728-4858-1-git-send-email-sudeep.holla@arm.com
This commit is contained in:
Sudeep Holla 2018-05-09 17:02:08 +01:00 • committed by Thomas Gleixner
commit 1332a90558
1 changed files with 2 additions and 1 deletions
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3
kernel/time/tick-common.c
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@ -277,7 +277,8 @@ static bool tick_check_preferred(struct clock_event_device *curdev,
*/
return !curdev ||
newdev->rating > curdev->rating ||
!cpumask_equal(curdev->cpumask, newdev->cpumask);
(!cpumask_equal(curdev->cpumask, newdev->cpumask) &&
!tick_check_percpu(curdev, newdev, smp_processor_id()));
}
/*