Messages in this thread | | | Date | Tue, 28 Feb 2017 19:56:44 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: [PATCH v3 04/25] clocksource: Add Owl timer |
| |
On Tue, 28 Feb 2017, Andreas Färber wrote: > This is a callback, which I thought is re-entrant.
It's not reentrant at least not on the same CPU. On a SMP machine this function might be called concurrently on several cores (assumed that the whole thing is replicated across cores).
> VAL changes when the timer is running, and CTL changes every time we > enable the timer. We could call _reset() here, but then we would be > initializing CMP twice, which again would be less performant then just > setting the registers to their final values directly.
Makes sense.
Thanks,
tglx | |