On Thu, 2017-04-20 at 17:30 +0200, Frederic Weisbecker wrote: > (This restores commit 24b91e360ef521a2808771633d76ebc68bd5604b that > got > reverted by commit 558e8e27e73f53f8a512485be538b07115fe5f3c due to a > regression where CPUs spuriously stopped ticking. The issue happened > when a tick fired too early past its expected expiration: on IRQ exit > the tick was scheduled again to the same deadline but skipped > reprogramming because ts->next_tick still kept in cache the deadline. > This has been fixed now with resetting ts->next_tick from the tick > itself. Extra care has also been taken to prevent from obsolete > values > throughout CPU hotplug operations.) > Acked-by: Rik van Riel <riel@xxxxxxxxxx>