linux-kernel - Re: [PATCH -next] powerpc/spufs: Fix build warning when CONFIG_PROC

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Date:   Mon, 7 Mar 2022 13:30:22 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Arnd Bergmann <arnd@...db.de>
CC:     YueHaibing <yuehaibing@...wei.com>,
        "jk@...abs.org" <jk@...abs.org>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "paulus@...ba.org" <paulus@...ba.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] powerpc/spufs: Fix build warning when
 CONFIG_PROC_FS=n



Le 07/03/2022 à 14:10, Arnd Bergmann a écrit :
> On Sun, Mar 6, 2022 at 9:04 PM Christophe Leroy
> <christophe.leroy@...roup.eu> wrote:
>> Le 05/03/2022 à 13:31, YueHaibing a écrit :
>>> arch/powerpc/platforms/cell/spufs/sched.c:1055:12: warning: ‘show_spu_loadavg’ defined but not used [-Wunused-function]
>>>    static int show_spu_loadavg(struct seq_file *s, void *private)
>>>               ^~~~~~~~~~~~~~~~
>>>
>>> Mark this as __maybe_unused to fix this.
>>
>> Marking it as __maybe_unused doesn't fix it. It just pushes the dust
>> under the carpet.
>>
>> proc_create_single macro should be fix to avoid that warning.
> 
> We discussed that when proc_create_single() was introduced, but ended up
> not doing it that way because there were already a lot of files using an #ifdef
> around the function definitions. To change it back, one would have to audit
> every user of proc_create_single() and remove the #ifdefs.
> 

Fair enough.

In that case, I'd prefer to go for a #ifdef as well for 
show_spu_loadavg() instead of going for a __maybe_unused flag.

Christophe