linux-kernel - Re: [PATCH] CodingStyle: Add a chapter on conditional compilation

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Message-ID: <CAMuHMdV2Z0+gon8+LP_7X2h4B4Hb3KAV2vpZ9kRwC2mVFGLWXw@mail.gmail.com>
Date:	Wed, 29 Oct 2014 20:12:49 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	Jonathan Corbet <corbet@....net>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] CodingStyle: Add a chapter on conditional compilation

On Wed, Oct 29, 2014 at 7:15 PM, Josh Triplett <josh@...htriplett.org> wrote:
> Document several common practices and conventions regarding conditional
> compilation, most notably the preference for ifdefs in headers rather
> than .c files.
>
> Signed-off-by: Josh Triplett <josh@...htriplett.org>

> +If you have a function or variable which may potentially go unused in a
> +particular configuration, and the compiler would warn about its definition
> +going unused, mark the definition as __maybe_unused rather than wrapping it in
> +a preprocessor conditional.  (However, if a function or variable *always* goes
> +unused, delete it.)

Personally, I don't like __maybe_unused. Once it's there, the compiler
will stop warning about it, even if it really becomes unused.

Apart from that:
Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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