linux-kernel - Re: [PATCH] iio: magn/ak8974: avoid unused function warning

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Message-ID: <CACRpkdbD-=o6CiZLLrEufi1QU+y-598QGDb5cH-VLRgDaeETKg@mail.gmail.com>
Date:   Mon, 29 Aug 2016 15:21:50 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: magn/ak8974: avoid unused function warning

On Fri, Aug 26, 2016 at 5:31 PM, Arnd Bergmann <arnd@...db.de> wrote:

> The ak8974_configure() function is used only from the PM code,
> but that can be hidden when CONFIG_PM is disabled:
>
> drivers/iio/magnetometer/ak8974.c:201:12: error: 'ak8974_configure' defined but not used [-Werror=unused-function]
>
> This replaces the #ifdef with a __maybe_unused annotation, which
> will work correctly in all configurations and avoid the warning,
> as the compiler can now see where ak8974_configure is called from.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 7c94a8b2ee8c ("iio: magn: add a driver for AK8974")

Nice catch!
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij