linux-kernel - RE: [PATCH 12/14] keyboard: snvs-pwrkey: use __maybe

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Date:	Wed, 2 Mar 2016 16:04:46 +0000
From:	Frank Li <frank.li@....com>
To:	Arnd Bergmann <arnd@...db.de>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Shawn Guo <shawnguo@...nel.org>,
	"b38343@...escale.com" <b38343@...escale.com>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Frank Li <Frank.Li@...escale.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 12/14] keyboard: snvs-pwrkey: use __maybe_unused to hide
 pm functions



> -----Original Message-----
> From: Arnd Bergmann [mailto:arnd@...db.de]
> Sent: Wednesday, March 02, 2016 9:59 AM
> To: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: linux-arm-kernel@...ts.infradead.org; Arnd Bergmann <arnd@...db.de>;
> Shawn Guo <shawnguo@...nel.org>; b38343@...escale.com; Javier
> Martinez Canillas <javier@....samsung.com>; Frank Li
> <Frank.Li@...escale.com>; linux-input@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: [PATCH 12/14] keyboard: snvs-pwrkey: use __maybe_unused to hide
> pm functions
> 
> The SNVS power key driver has suspend/resume functions that are accessed
> using SIMPLE_DEV_PM_OPS, which hide the reference when
> CONFIG_PM_SLEEP is not set, resulting in a warning about unused functions:
> 
> drivers/input/keyboard/snvs_pwrkey.c:183:12: error:
> 'imx_snvs_pwrkey_suspend' defined but not used [-Werror=unused-function]
> drivers/input/keyboard/snvs_pwrkey.c:194:12: error:
> 'imx_snvs_pwrkey_resume' defined but not used [-Werror=unused-function]
> 
> This adds __maybe_unused annotations to let the compiler know it can
> silently drop the function definition.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Frank Li <Frank.Li@....com>

> ---
>  drivers/input/keyboard/snvs_pwrkey.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/input/keyboard/snvs_pwrkey.c
> b/drivers/input/keyboard/snvs_pwrkey.c
> index 9adf13a5864a..b0ffadeb208c 100644
> --- a/drivers/input/keyboard/snvs_pwrkey.c
> +++ b/drivers/input/keyboard/snvs_pwrkey.c
> @@ -180,7 +180,7 @@ static int imx_snvs_pwrkey_probe(struct
> platform_device *pdev)
>  	return 0;
>  }
> 
> -static int imx_snvs_pwrkey_suspend(struct device *dev)
> +static int __maybe_unused imx_snvs_pwrkey_suspend(struct device *dev)
>  {
>  	struct platform_device *pdev = to_platform_device(dev);
>  	struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev); @@ -
> 191,7 +191,7 @@ static int imx_snvs_pwrkey_suspend(struct device *dev)
>  	return 0;
>  }
> 
> -static int imx_snvs_pwrkey_resume(struct device *dev)
> +static int __maybe_unused imx_snvs_pwrkey_resume(struct device *dev)
>  {
>  	struct platform_device *pdev = to_platform_device(dev);
>  	struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
> --
> 2.7.0