linux-kernel - Re: [PATCH 1/2] x86: apm: mark proc_apm_show as __maybe

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Date:   Mon, 20 Aug 2018 18:11:31 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Al Viro <viro@...iv.linux.org.uk>, Jiri Kosina <jikos@...nel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Christoph Hellwig <hch@....de>, Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] x86: apm: mark proc_apm_show as __maybe_unused

On Mon, Aug 20, 2018 at 5:40 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> On Tue, 14 Aug 2018, Arnd Bergmann wrote:
>
> > A new build error appeared with CONFIG_PROC_FS disabled:
> >
> > arch/x86/kernel/apm_32.c:1643:12: error: 'proc_apm_show' defined but not used [-Werror=unused-function]
> >
> > This marks the function as __maybe_unused to let the compiler drop
> > it silently.
> >
> > Fixes: 3f3942aca6da ("proc: introduce proc_create_single{,_data}")
>
> The proper fix for this is to convert the stub function for proc_apm_show()
> to an inline. The compiler complains because the stub is a macro ....

I even did that
https://patchwork.ozlabs.org/patch/920786/

but then a handful of patches went into the kernel to add #ifdefs
around the other proc_show functions, so it no longer applied.
These two are the only remaining ones.

      Arnd