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

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Message-ID: <CAK8P3a2p+Yryg1y5h=kTLP72WGYc2d4qctFuW+opR6F=1uYJPw@mail.gmail.com>
Date:   Mon, 7 Mar 2022 14:10:39 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     YueHaibing <yuehaibing@...wei.com>,
        "jk@...abs.org" <jk@...abs.org>, "arnd@...db.de" <arnd@...db.de>,
        "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

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.

        Arnd