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

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Message-ID: <CANDhNCqNqXfGgvo8vNof1qi3E3jejk5KBD=oedZp2_p8RKZdjw@mail.gmail.com>
Date: Mon, 31 Mar 2025 16:45:02 -0700
From: John Stultz <jstultz@...gle.com>
To: Will McVicker <willmcvicker@...gle.com>
Cc: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	Peter Griffin <peter.griffin@...aro.org>, André Draszik <andre.draszik@...aro.org>, 
	Tudor Ambarus <tudor.ambarus@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Alim Akhtar <alim.akhtar@...sung.com>, Daniel Lezcano <daniel.lezcano@...aro.org>, 
	Thomas Gleixner <tglx@...utronix.de>, Saravana Kannan <saravanak@...gle.com>, 
	Krzysztof Kozlowski <krzk@...nel.org>, kernel-team@...roid.com, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org, 
	Hosung Kim <hosung0.kim@...sung.com>
Subject: Re: [PATCH v1 3/6] clocksource/drivers/exynos_mct: Set local timer
 interrupts as percpu

On Mon, Mar 31, 2025 at 4:00 PM 'Will McVicker' via kernel-team
<kernel-team@...roid.com> wrote:
>
> From: Hosung Kim <hosung0.kim@...sung.com>
>
> 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.

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

thanks!
-john