linux-kernel - Re: [PATCH v2] clocksource: Add node counter timer driver for MIPS/Loongson64

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Date: Tue, 28 May 2024 21:17:19 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Jiaxun Yang <jiaxun.yang@...goat.com>, Huacai Chen
 <chenhuacai@...nel.org>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: linux-kernel@...r.kernel.org, "linux-mips@...r.kernel.org"
 <linux-mips@...r.kernel.org>
Subject: Re: [PATCH v2] clocksource: Add node counter timer driver for
 MIPS/Loongson64

On Tue, May 28 2024 at 15:31, Jiaxun Yang wrote:
> 在2024年5月27日五月 下午5:32，Jiaxun Yang写道：
>> 在2024年5月27日五月 下午4:51，Thomas Gleixner写道：
>>> Jiaxun!
>>>
>> Hi Thomas,
>> [...]
>>>
>>> What's this indirection for? Why dont you update 
>> [...]
>>>
>>>> +static struct clocksource nodecnt_clocksource = {
>>>> +	.name	= "nodecnt",
>>>> +	.read	= nodecnt_clocksource_read,
>>>
>>> the read function pointer here and spare the indirection?
>> Smart! sched_clock takes slightly different function pointer argument type
>> but as we don't use the argument anyway, it should be safe to relax this
>> indirection.
>
> Sadly, I'm unable to remove it with force type catsing :-/
>
> drivers/clocksource/loongson-nodecnt.c: In function ‘nodecnt_clocksource_init’:
> drivers/clocksource/loongson-nodecnt.c:89:36: warning: cast between incompatible function types from ‘u64 (*)(void)’ {aka ‘long long unsigned int (*)(void)’} to ‘u64 (*)(struct clocksource *)’ {aka ‘long long unsigned int (*)(struct clocksource *)’} [-Wcast-function-type]
>    89 |         nodecnt_clocksource.read = (u64 (*)(struct clocksource *))nodecnt_read_fn;
>

What about making the actual read functions have the required function
signature? The clocksource argument is not used in those real functions.

Thanks,

        tglx