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

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Date:   Tue, 28 Jun 2022 13:09:12 -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
Subject: Re: [PATCH 8/8] watchdog: wdat_wdt: Remove #ifdef guards for PM
 related functions

On Tue, Jun 28, 2022 at 08:34:49PM +0100, Paul Cercueil wrote:
> Use the new NOIRQ_SYSTEM_SLEEP_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>

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

> ---
>  drivers/watchdog/wdat_wdt.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/watchdog/wdat_wdt.c b/drivers/watchdog/wdat_wdt.c
> index e6f95e99156d..aeadaa07c891 100644
> --- a/drivers/watchdog/wdat_wdt.c
> +++ b/drivers/watchdog/wdat_wdt.c
> @@ -467,7 +467,6 @@ static int wdat_wdt_probe(struct platform_device *pdev)
>  	return devm_watchdog_register_device(dev, &wdat->wdd);
>  }
>  
> -#ifdef CONFIG_PM_SLEEP
>  static int wdat_wdt_suspend_noirq(struct device *dev)
>  {
>  	struct wdat_wdt *wdat = dev_get_drvdata(dev);
> @@ -528,18 +527,16 @@ static int wdat_wdt_resume_noirq(struct device *dev)
>  
>  	return wdat_wdt_start(&wdat->wdd);
>  }
> -#endif
>  
>  static const struct dev_pm_ops wdat_wdt_pm_ops = {
> -	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(wdat_wdt_suspend_noirq,
> -				      wdat_wdt_resume_noirq)
> +	NOIRQ_SYSTEM_SLEEP_PM_OPS(wdat_wdt_suspend_noirq, wdat_wdt_resume_noirq)
>  };
>  
>  static struct platform_driver wdat_wdt_driver = {
>  	.probe = wdat_wdt_probe,
>  	.driver = {
>  		.name = "wdat_wdt",
> -		.pm = &wdat_wdt_pm_ops,
> +		.pm = pm_sleep_ptr(&wdat_wdt_pm_ops),
>  	},
>  };
>  
> -- 
> 2.35.1
>