Message-ID: <ad3a5c30-5062-55ae-7908-c0a127bec5ee@gmail.com>
Date:   Wed, 8 Feb 2023 20:41:32 +0100
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Subject: Re: [PATCH 1/3] time/sched_clock: Export sched_clock_register()
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To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        walter.chang@mediatek.com,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        "Maciej W . Rozycki" <macro@orcam.me.uk>,
        John Stultz <jstultz@google.com>
Cc:     wsd_upstream@mediatek.com, stanley.chu@mediatek.com,
        Chun-hung.Wu@mediatek.com, Freddy.Hsin@mediatek.com,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org
References: <20230208094813.20874-1-walter.chang@mediatek.com>
 <20230208094813.20874-2-walter.chang@mediatek.com>
 <e1a89a4e-8a0d-47e1-a8fd-75ea152ef816@linaro.org>
From:   Matthias Brugger <matthias.bgg@gmail.com>
In-Reply-To: <e1a89a4e-8a0d-47e1-a8fd-75ea152ef816@linaro.org>
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On 08/02/2023 15:24, Krzysztof Kozlowski wrote:
> On 08/02/2023 10:48, walter.chang@mediatek.com wrote:
>> From: Chun-Hung Wu <chun-hung.wu@mediatek.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@mediatek.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.
> 

I'd propose to add at least one driver that will need these changes, to make it 
clear why you need that.

Regards,
Matthias