linux-kernel - Re: [PATCH 1/2] clocksource/drivers/exynos_mct: Prioritise Arm arch timer on arm64

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Date:   Mon, 21 Jun 2021 12:18:38 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Will Deacon <will@...nel.org>
Cc:     Chanwoo Choi <cw00.choi@...sung.com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/2] clocksource/drivers/exynos_mct: Prioritise Arm arch
 timer on arm64

On 21/06/2021 12:10, Will Deacon wrote:

[ ... ]

>>> exynos4_mct_frc_start() is called unconditionally from probe via
>>> exynos4_clocksource_init() so as long as the mct probes first, then the
>>> arch timer should work, no? The rating shouldn't affect that.
>>
>> How do you ensure the exynos mct is probed before the arch timer ?
>>
>> The Makefile provides the right order, but the dependency is implicit.
> 
> Currently, I think it's done by the order of the CPU hotplug notifiers (
> see the hunk of 6282edb72bed which touches cpuhotplug.h).

Ah, right. Indeed whatever the DT order, the cpuhotplug order solves the
dependency.

Chanwoo, are fine with this change ?


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