linux-kernel - Re: [PATCH] rtc: cmos: avoid unused function warning

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Date:   Thu, 22 Sep 2016 14:24:25 +0200
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Gabriele Mazzotta <gabriele.mzt@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc: cmos: avoid unused function warning

On 22/09/2016 at 11:48:00 +0200, Arnd Bergmann wrote :
> A bug fix for the ACPI side of this driver caused a harmless
> build warning:
> 
> drivers/rtc/rtc-cmos.c:1115:13: error: 'cmos_check_acpi_rtc_status' defined but not used [-Werror=unused-function]
>  static void cmos_check_acpi_rtc_status(struct device *dev,
> 
> We can avoid the warning and simplify the driver at the same time
> by removing the #ifdef for CONFIG_PM and rely on the SIMPLE_DEV_PM_OPS()
> to set everything up correctly. cmos_resume() has to get marked
> as __maybe_unused so we don't introduce another warning, and
> the two variants of cmos_poweroff() can get merged into one using
> an IS_ENABLED() check.
> 
> Fixes: 983bf1256edb ("rtc: cmos: Clear ACPI-driven alarms upon resume")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/rtc/rtc-cmos.c | 21 ++++-----------------
>  1 file changed, 4 insertions(+), 17 deletions(-)
> 
Applied, thanks.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com