linux-kernel - Re: [PATCH 4/8] watchdog: s3c2410_wdt: Remove #ifdef guards for PM related functions

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Message-ID: <20220628200305.GD3633970@roeck-us.net>
Date:   Tue, 28 Jun 2022 13:03:05 -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,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 4/8] watchdog: s3c2410_wdt: Remove #ifdef guards for PM
 related functions

On Tue, Jun 28, 2022 at 08:34:45PM +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: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Cc: Alim Akhtar <alim.akhtar@...sung.com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-samsung-soc@...r.kernel.org

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

> ---
>  drivers/watchdog/s3c2410_wdt.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
> index 6db22f2e3a4f..95919392927f 100644
> --- a/drivers/watchdog/s3c2410_wdt.c
> +++ b/drivers/watchdog/s3c2410_wdt.c
> @@ -845,8 +845,6 @@ static void s3c2410wdt_shutdown(struct platform_device *dev)
>  	s3c2410wdt_stop(&wdt->wdt_device);
>  }
>  
> -#ifdef CONFIG_PM_SLEEP
> -
>  static int s3c2410wdt_suspend(struct device *dev)
>  {
>  	int ret;
> @@ -885,10 +883,9 @@ static int s3c2410wdt_resume(struct device *dev)
>  
>  	return 0;
>  }
> -#endif
>  
> -static SIMPLE_DEV_PM_OPS(s3c2410wdt_pm_ops, s3c2410wdt_suspend,
> -			s3c2410wdt_resume);
> +static DEFINE_SIMPLE_DEV_PM_OPS(s3c2410wdt_pm_ops,
> +				s3c2410wdt_suspend, s3c2410wdt_resume);
>  
>  static struct platform_driver s3c2410wdt_driver = {
>  	.probe		= s3c2410wdt_probe,
> @@ -897,7 +894,7 @@ static struct platform_driver s3c2410wdt_driver = {
>  	.id_table	= s3c2410_wdt_ids,
>  	.driver		= {
>  		.name	= "s3c2410-wdt",
> -		.pm	= &s3c2410wdt_pm_ops,
> +		.pm	= pm_sleep_ptr(&s3c2410wdt_pm_ops),
>  		.of_match_table	= of_match_ptr(s3c2410_wdt_match),
>  	},
>  };
> -- 
> 2.35.1
>