linux-kernel - Re: [PATCH v5 4/7] clocksource/drivers/exynos_mct: Use percpu interrupts only on ARM64

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Message-ID: <aPuhO5wn8O85krV3@google.com>
Date: Fri, 24 Oct 2025 15:54:35 +0000
From: William McVicker <willmcvicker@...gle.com>
To: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Russell King <linux@...linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Griffin <peter.griffin@...aro.org>,
	Youngmin Nam <youngmin.nam@...sung.com>,
	Donghoon Yu <hoony.yu@...sung.com>, Rob Herring <robh@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	John Stultz <jstultz@...gle.com>,
	Tudor Ambarus <tudor.ambarus@...aro.org>,
	André Draszik <andre.draszik@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-samsung-soc@...r.kernel.org, kernel-team@...roid.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v5 4/7] clocksource/drivers/exynos_mct: Use percpu
 interrupts only on ARM64

On 10/24/2025, Marek Szyprowski wrote:
> On 23.10.2025 22:52, Will McVicker wrote:
> > From: Marek Szyprowski <m.szyprowski@...sung.com>
> >
> > For some unknown reasons forcing percpu interrupts for local timers
> > breaks CPU hotplug for 'little' cores on legacy ARM 32bit Exynos based
> > machines (for example Exynos5422-based Odroid-XU3/XU4 boards). Use percpu
> > flag only when driver is compiled for newer ARM64 architecture.
> >
> > Fixes: f3cec54ee3bf ("clocksource/drivers/exynos_mct: Set local timer interrupts as percpu")
> 
> This tag doesn't make sense in this patchset. Simply squash this change 
> with the previous one, adding the following tags:
> 
> Suggested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Link: 
> https://lore.kernel.org/all/20250827102645.1964659-1-m.szyprowski@samsung.com/ 

Okay, no problem!

--Will