linux-kernel - Re: [PATCH 1/3] time/sched_clock: Export sched_clock

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Message-ID: <5821b2c6-0e50-5a75-0d11-c299e68cb200@linaro.org>
Date:   Thu, 9 Feb 2023 16:34:58 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        walter.chang@...iatek.com, Thomas Gleixner <tglx@...utronix.de>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        "Maciej W . Rozycki" <macro@...am.me.uk>,
        John Stultz <jstultz@...gle.com>
Cc:     wsd_upstream@...iatek.com, stanley.chu@...iatek.com,
        Chun-hung.Wu@...iatek.com, Freddy.Hsin@...iatek.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/3] time/sched_clock: Export sched_clock_register()

On 08/02/2023 20:45, Krzysztof Kozlowski wrote:
> On 08/02/2023 20:41, Matthias Brugger wrote:
>>
>>
>> On 08/02/2023 15:24, Krzysztof Kozlowski wrote:
>>> On 08/02/2023 10:48, walter.chang@...iatek.com wrote:
>>>> From: Chun-Hung Wu <chun-hung.wu@...iatek.com>
>>>>
>>>> clocksource driver may use sched_clock_register()
>>>> to resigter itself as a sched_clock source.
>>>> Export it to support building such driver
>>>> as module, like timer-mediatek.c
>>>>
>>>> Signed-off-by: Chun-Hung Wu <chun-hung.wu@...iatek.com>
>>>> ---

[ ... ]

> ... and actually test if the system works fine when booted from such
> clocksource as a module. I have doubts that and unfortunately folks
> working on GKI like to put whatever stuff from mainline into modules
> even if it does not make sense for us (see long time ago discussion
> about pinctrl drivers).

+1

It is not the first time there is a proposal to convert the timers to 
modules. After asking, nobody came with a real study regarding the 
impact of the modularization of these drivers vs the time core framework 
and the benefit.

My gut feeling is that is not that simple.


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