Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-25 13:41:51 +00:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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
parent 7197e77abc
commit 1332a90558
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
kernel/time/tick-common.c
View File

@ -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()));
}
/*