Re: [PATCH v1 3/6] clocksource/drivers/exynos_mct: Set local timer interrupts as percpu

[William McVicker]

On 03/31/2025, John Stultz wrote:
> On Mon, Mar 31, 2025 at 4:00 PM 'Will McVicker' via kernel-team
> <kernel-team@xxxxxxxxxxx> wrote:
> >
> > From: Hosung Kim <hosung0.kim@xxxxxxxxxxx>
> >
> > The MCT local timers can be used as a per-cpu event timer. To prevent
> 
> Can be used, or are used?  If it's an option, is this change important
> in both cases?
> 
> > the timer interrupts from migrating to other CPUs, set the flag
> > IRQF_PERCPU.
> 
> Might be work expanding this a bit to clarify why the interrupts
> migrating to other cpus is undesired.

Let me dig into this further to figure out if the IP has a limitation where the
interrupts need to be handled by the CPU the timer was triggered on or if this
is just an optimization.

Any chance you know this @Youngmin?

Thanks,
Will

> 
> > Signed-off-by: Hosung Kim <hosung0.kim@xxxxxxxxxxx>
> > [Original commit from https://android.googlesource.com/kernel/gs/+/03267fad19f093bac979ca78309483e9eb3a8d16]
> > Signed-off-by: Will McVicker <willmcvicker@xxxxxxxxxx>
> 
> thanks!
> -john