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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ad3a5c30-5062-55ae-7908-c0a127bec5ee@gmail.com>
Date:   Wed, 8 Feb 2023 20:41:32 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        walter.chang@...iatek.com,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        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 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>
>> ---
>>   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