linux-kernel - Re: [PATCH 3/8] watchdog: mtk_wdt: Remove #ifdef guards for PM related functions

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Date:   Tue, 28 Jun 2022 13:02:49 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 3/8] watchdog: mtk_wdt: Remove #ifdef guards for PM
 related functions

On Tue, Jun 28, 2022 at 08:34:44PM +0100, Paul Cercueil wrote:
> Use the new DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr() macros to
> handle the .suspend/.resume callbacks.
> 
> These macros allow the suspend and resume functions to be automatically
> dropped by the compiler when CONFIG_SUSPEND is disabled, without having
> to use #ifdef guards. Not using #ifdef guards means that the code is
> always compiled independently of any Kconfig option, and thanks to that
> bugs and regressions are easier to catch.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> Cc: Matthias Brugger <matthias.bgg@...il.com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-mediatek@...ts.infradead.org

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/watchdog/mtk_wdt.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
> index f0d4e3cc7459..e97787536792 100644
> --- a/drivers/watchdog/mtk_wdt.c
> +++ b/drivers/watchdog/mtk_wdt.c
> @@ -401,7 +401,6 @@ static int mtk_wdt_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -#ifdef CONFIG_PM_SLEEP
>  static int mtk_wdt_suspend(struct device *dev)
>  {
>  	struct mtk_wdt_dev *mtk_wdt = dev_get_drvdata(dev);
> @@ -423,7 +422,6 @@ static int mtk_wdt_resume(struct device *dev)
>  
>  	return 0;
>  }
> -#endif
>  
>  static const struct of_device_id mtk_wdt_dt_ids[] = {
>  	{ .compatible = "mediatek,mt2712-wdt", .data = &mt2712_data },
> @@ -437,16 +435,14 @@ static const struct of_device_id mtk_wdt_dt_ids[] = {
>  };
>  MODULE_DEVICE_TABLE(of, mtk_wdt_dt_ids);
>  
> -static const struct dev_pm_ops mtk_wdt_pm_ops = {
> -	SET_SYSTEM_SLEEP_PM_OPS(mtk_wdt_suspend,
> -				mtk_wdt_resume)
> -};
> +static DEFINE_SIMPLE_DEV_PM_OPS(mtk_wdt_pm_ops,
> +				mtk_wdt_suspend, mtk_wdt_resume);
>  
>  static struct platform_driver mtk_wdt_driver = {
>  	.probe		= mtk_wdt_probe,
>  	.driver		= {
>  		.name		= DRV_NAME,
> -		.pm		= &mtk_wdt_pm_ops,
> +		.pm		= pm_sleep_ptr(&mtk_wdt_pm_ops),
>  		.of_match_table	= mtk_wdt_dt_ids,
>  	},
>  };
> -- 
> 2.35.1
>