linux-kernel - Re: [PATCH] thermal: tegra: mark PM functions __maybe

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Date:	Mon, 18 Apr 2016 09:15:13 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Eduardo Valentin <edubezval@...il.com>, Wei Ni <wni@...dia.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Jon Hunter <jonathanh@...dia.com>, linux-pm@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: tegra: mark PM functions __maybe_unused

On Sat, Apr 16, 2016 at 10:19:33PM +0200, Arnd Bergmann wrote:
> After the PM support has been added to this driver, we get
> a harmless warning when that support is disabled at compile
> time:
> 
> drivers/thermal/tegra/soctherm.c:641:12: error: 'soctherm_resume' defined but not used [-Werror=unused-function]
>  static int soctherm_resume(struct device *dev)
> 
> This marks the two PM functions as __maybe_unused to shut up
> the warning. This is preferred over adding an #ifdef around
> them, as it is harder to get wrong, and provides better
> compile-time coverage.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: a134b4143b65 ("thermal: tegra: add PM support")
> ---
>  drivers/thermal/tegra/soctherm.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

The need for this should go away when Jon's generic power domain series
gets merged (hopefully very soon now) and enabled on 32-bit ARM. In the
meantime:

Acked-by: Thierry Reding <treding@...dia.com>

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