linux-kernel - Re: [PATCH 3/4] watchdog: omap: Remove #ifdef guards for PM related functions

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Date:   Thu, 20 Oct 2022 15:00:05 -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
Subject: Re: [PATCH 3/4] watchdog: omap: Remove #ifdef guards for PM related
 functions

On Thu, Oct 20, 2022 at 07:50:46PM +0100, Paul Cercueil wrote:
> Use the pm_ptr() macro to handle the .suspend/.resume callbacks.
> 
> This macro allows 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/omap_wdt.c | 11 ++---------
>  1 file changed, 2 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
> index 74d785b2b478..e75aa86f63cb 100644
> --- a/drivers/watchdog/omap_wdt.c
> +++ b/drivers/watchdog/omap_wdt.c
> @@ -316,8 +316,6 @@ static int omap_wdt_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -#ifdef	CONFIG_PM
> -
>  /* REVISIT ... not clear this is the best way to handle system suspend; and
>   * it's very inappropriate for selective device suspend (e.g. suspending this
>   * through sysfs rather than by stopping the watchdog daemon).  Also, this
> @@ -353,11 +351,6 @@ static int omap_wdt_resume(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -#else
> -#define	omap_wdt_suspend	NULL
> -#define	omap_wdt_resume		NULL
> -#endif
> -
>  static const struct of_device_id omap_wdt_of_match[] = {
>  	{ .compatible = "ti,omap3-wdt", },
>  	{},
> @@ -368,8 +361,8 @@ static struct platform_driver omap_wdt_driver = {
>  	.probe		= omap_wdt_probe,
>  	.remove		= omap_wdt_remove,
>  	.shutdown	= omap_wdt_shutdown,
> -	.suspend	= omap_wdt_suspend,
> -	.resume		= omap_wdt_resume,
> +	.suspend	= pm_ptr(omap_wdt_suspend),
> +	.resume		= pm_ptr(omap_wdt_resume),
>  	.driver		= {
>  		.name	= "omap_wdt",
>  		.of_match_table = omap_wdt_of_match,
> -- 
> 2.35.1
>