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

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Date:   Wed, 8 Feb 2023 15:24:59 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     walter.chang@...iatek.com,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        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 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>
> ---
>  kernel/time/sched_clock.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c
> index 8464c5acc913..8e49e87d1221 100644
> --- a/kernel/time/sched_clock.c
> +++ b/kernel/time/sched_clock.c
> @@ -150,8 +150,7 @@ static enum hrtimer_restart sched_clock_poll(struct hrtimer *hrt)
>  	return HRTIMER_RESTART;
>  }
>  
> -void __init
> -sched_clock_register(u64 (*read)(void), int bits, unsigned long rate)
> +void sched_clock_register(u64 (*read)(void), int bits, unsigned long rate)

Is there a non-init caller?

>  {
>  	u64 res, wrap, new_mask, new_epoch, cyc, ns;
>  	u32 new_mult, new_shift;
> @@ -223,6 +222,7 @@ sched_clock_register(u64 (*read)(void), int bits, unsigned long rate)
>  
>  	pr_debug("Registered %pS as sched_clock source\n", read);
>  }
> +EXPORT_SYMBOL_GPL(sched_clock_register);

Where is the module using it?

You need to bring users of these two changes, not just prepare something
for your out of tree patches.


Best regards,
Krzysztof