linux-kernel - Re: [PATCH] pinctrl: samsung: mark PM functions as __maybe

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Date:   Thu, 02 Feb 2017 07:57:19 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Tomasz Figa <tomasz.figa@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: samsung: mark PM functions as __maybe_unused

Hi Arnd,

On 2017-02-01 17:16, Arnd Bergmann wrote:
> The rework of the suspend/resume handling uses the wrong #ifdef check, leading
> to a build warning without CONFIG_PM_SLEEP:
>
> drivers/pinctrl/samsung/pinctrl-samsung.c:1142:12: error: 'samsung_pinctrl_resume' defined but not used [-Werror=unused-function]
> drivers/pinctrl/samsung/pinctrl-samsung.c:1092:12: error: 'samsung_pinctrl_suspend' defined but not used [-Werror=unused-function]
>
> Using a __maybe_unused annotation instead of the #ifdef is a simple way to
> avoid this problem class.
>
> Fixes: 2b24efa8e5c5 ("pinctrl: samsung: Replace syscore ops with standard platform device pm_ops")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks for the fix!

Acked-by: Marek Szyprowski <m.szyprowski@...sung.com>

> ---
>   drivers/pinctrl/samsung/pinctrl-samsung.c | 6 ++----
>   1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
> index d79eadad6c5f..d601b5303e73 100644
> --- a/drivers/pinctrl/samsung/pinctrl-samsung.c
> +++ b/drivers/pinctrl/samsung/pinctrl-samsung.c
> @@ -1083,13 +1083,12 @@ static int samsung_pinctrl_probe(struct platform_device *pdev)
>   	return 0;
>   }
>   
> -#ifdef CONFIG_PM
>   /**
>    * samsung_pinctrl_suspend - save pinctrl state for suspend
>    *
>    * Save data for all banks handled by this device.
>    */
> -static int samsung_pinctrl_suspend(struct device *dev)
> +static int __maybe_unused samsung_pinctrl_suspend(struct device *dev)
>   {
>   	struct samsung_pinctrl_drv_data *drvdata = dev_get_drvdata(dev);
>   	int i;
> @@ -1139,7 +1138,7 @@ static int samsung_pinctrl_suspend(struct device *dev)
>    * We don't bother doing anything complicated to avoid glitching lines since
>    * we're called before pad retention is turned off.
>    */
> -static int samsung_pinctrl_resume(struct device *dev)
> +static int __maybe_unused samsung_pinctrl_resume(struct device *dev)
>   {
>   	struct samsung_pinctrl_drv_data *drvdata = dev_get_drvdata(dev);
>   	int i;
> @@ -1183,7 +1182,6 @@ static int samsung_pinctrl_resume(struct device *dev)
>   
>   	return 0;
>   }
> -#endif
>   
>   static const struct of_device_id samsung_pinctrl_dt_match[] = {
>   #ifdef CONFIG_PINCTRL_EXYNOS

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland