[PATCH -next] powerpc/spufs: Fix build warning when CONFIG_PROC_FS=n

[Christophe Leroy]

Le 07/03/2022 à 14:10, Arnd Bergmann a écrit :
> On Sun, Mar 6, 2022 at 9:04 PM Christophe Leroy
> <christophe.leroy at csgroup.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