linux-kernel - Re: [PATCH] macintosh/via-pmu: Fix compiler warnings when CONFIG_PROC

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Message-ID: <073c34e0-a016-cf70-1deb-be286da94bde@csgroup.eu>
Date:   Mon, 21 Mar 2022 08:56:36 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Finn Thain <fthain@...ux-m68k.org>
CC:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] macintosh/via-pmu: Fix compiler warnings when
 CONFIG_PROC_FS is disabled



Le 21/03/2022 à 09:50, Finn Thain a écrit :
> Hi Christophe,
> 
> On Mon, 21 Mar 2022, Finn Thain wrote:
> 
>> On Mon, 21 Mar 2022, Christophe Leroy wrote:
>>
>>> Le 19/03/2022 à 08:20, Finn Thain a écrit :
>>>> drivers/macintosh/via-pmu.c:897:12: warning: 'pmu_battery_proc_show' defined but not used [-Wunused-function]
>>>>    static int pmu_battery_proc_show(struct seq_file *m, void *v)
>>>>               ^~~~~~~~~~~~~~~~~~~~~
>>>> drivers/macintosh/via-pmu.c:871:12: warning: 'pmu_irqstats_proc_show' defined but not used [-Wunused-function]
>>>>    static int pmu_irqstats_proc_show(struct seq_file *m, void *v)
>>>>               ^~~~~~~~~~~~~~~~~~~~~~
>>>> drivers/macintosh/via-pmu.c:860:12: warning: 'pmu_info_proc_show' defined but not used [-Wunused-function]
>>>>    static int pmu_info_proc_show(struct seq_file *m, void *v)
>>>>               ^~~~~~~~~~~~~~~~~~
>>>>
>>>> Rearrange some code and add some #ifdefs to avoid unused code warnings
>>>> when CONFIG_PROC_FS is disabled.
>>>
>>> Why not just put those three functions inside an #ifdef CONFIG_PROC_FS ?
>>>
>>
>> You'd get a warning about the prototypes ("declared static but never
>> defined"). Rather than add an ifdef around the prototypes as well, I
>> just reordered things a little.
> 
> Oops, I was forgetting that I also added an ifdef around the new
> prototype.
> 
> The simplest solution is probably the patch below, as it better exploits
> the stubbed-out proc_* API in include/linux/proc_fs.h.
> 
> Was this what you had in mind?

Yes that's exactly what I had in mind.

Thanks
Christophe