linux-kernel - Re: [PATCH 01/14] pinctrl: at91: use __maybe

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Date:	Wed, 2 Mar 2016 17:47:57 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Ludovic Desroches <ludovic.desroches@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/14] pinctrl: at91: use __maybe_unused to hide pm
 functions

On Wed, Mar 02, 2016 at 04:58:53PM +0100, Arnd Bergmann wrote:
> The at91-pio4 pinctrl driver uses SET_SYSTEM_SLEEP_PM_OPS() to
> conditionally set the correct suspend/resume options, but they
> become unused when CONFIG_PM is disabled:
> 
> drivers/pinctrl/pinctrl-at91-pio4.c:827:12: error: 'atmel_pctrl_suspend' defined but not used [-Werror=unused-function]
> drivers/pinctrl/pinctrl-at91-pio4.c:847:12: error: 'atmel_pctrl_resume' defined but not used [-Werror=unused-function]
> 
> This adds __maybe_unused annotations so the compiler knows
> it can silently drop them instead of warning.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Ludovic Desroches <ludovic.desroches@...el.com>

Thanks

> ---
>  drivers/pinctrl/pinctrl-at91-pio4.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
> index ee69db6ae1c7..4429312e848d 100644
> --- a/drivers/pinctrl/pinctrl-at91-pio4.c
> +++ b/drivers/pinctrl/pinctrl-at91-pio4.c
> @@ -824,7 +824,7 @@ static struct pinctrl_desc atmel_pinctrl_desc = {
>  	.pmxops		= &atmel_pmxops,
>  };
>  
> -static int atmel_pctrl_suspend(struct device *dev)
> +static int __maybe_unused atmel_pctrl_suspend(struct device *dev)
>  {
>  	struct platform_device *pdev = to_platform_device(dev);
>  	struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
> @@ -844,7 +844,7 @@ static int atmel_pctrl_suspend(struct device *dev)
>  	return 0;
>  }
>  
> -static int atmel_pctrl_resume(struct device *dev)
> +static int __maybe_unused atmel_pctrl_resume(struct device *dev)
>  {
>  	struct platform_device *pdev = to_platform_device(dev);
>  	struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
> -- 
> 2.7.0
>