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

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Date:   Fri, 17 Aug 2018 08:43:44 +0200
From:   Christoph Hellwig <hch@....de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Jiri Kosina <jikos@...nel.org>, x86@...nel.org,
        Christoph Hellwig <hch@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86: apm: mark proc_apm_show as __maybe_unused

On Tue, Aug 14, 2018 at 11:18:45AM +0200, 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}")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

I have to admit I actually prefer ifdefs over magic __maybe_unused
annotations.  But otherwise this looks correct to me, same for the
other patch.