linux-kernel - Re: [PATCH] fbdev: sm712fb: avoid unused function warnings

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Date:	Mon, 7 Dec 2015 18:11:54 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Teddy Wang <teddy.wang@...iconmotion.com>,
	<linux-fbdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] fbdev: sm712fb: avoid unused function warnings



On 20/11/15 23:48, Arnd Bergmann wrote:
> The sm712fb framebuffer driver encloses the power-management
> functions in #ifdef CONFIG_PM, but the smtcfb_pci_suspend/resume
> functions are only really used when CONFIG_PM_SLEEP is also
> set, as a frequent gcc warning shows:
> 
> fbdev/sm712fb.c:1549:12: warning: 'smtcfb_pci_suspend' defined but not used
> fbdev/sm712fb.c:1572:12: warning: 'smtcfb_pci_resume' defined but not used
> 
> The driver also avoids using the SIMPLE_DEV_PM_OPS macro when
> CONFIG_PM is unset, which is redundant.
> 
> This changes the driver to remove the #ifdef and instead mark
> the functions as __maybe_unused, which is a nicer anyway, as it
> provides build testing for all the code in all configurations
> and is harder to get wrong.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks, applied for 4.5.

 Tomi


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