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

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Message-ID: <20221020220029.GD4035307@roeck-us.net>
Date:   Thu, 20 Oct 2022 15:00:29 -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 4/4] watchdog: kempld: Remove #ifdef guards for PM
 related functions

On Thu, Oct 20, 2022 at 07:50:47PM +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/kempld_wdt.c | 11 ++---------
>  1 file changed, 2 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/watchdog/kempld_wdt.c b/drivers/watchdog/kempld_wdt.c
> index 40bd518ed873..e6c7a2906680 100644
> --- a/drivers/watchdog/kempld_wdt.c
> +++ b/drivers/watchdog/kempld_wdt.c
> @@ -75,9 +75,7 @@ struct kempld_wdt_data {
>  	struct watchdog_device		wdd;
>  	unsigned int			pretimeout;
>  	struct kempld_wdt_stage		stage[KEMPLD_WDT_MAX_STAGES];
> -#ifdef CONFIG_PM
>  	u8				pm_status_store;
> -#endif
>  };
>  
>  #define DEFAULT_TIMEOUT		30 /* seconds */
> @@ -495,7 +493,6 @@ static int kempld_wdt_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -#ifdef CONFIG_PM
>  /* Disable watchdog if it is active during suspend */
>  static int kempld_wdt_suspend(struct platform_device *pdev,
>  				pm_message_t message)
> @@ -531,18 +528,14 @@ static int kempld_wdt_resume(struct platform_device *pdev)
>  	else
>  		return kempld_wdt_stop(wdd);
>  }
> -#else
> -#define kempld_wdt_suspend	NULL
> -#define kempld_wdt_resume	NULL
> -#endif
>  
>  static struct platform_driver kempld_wdt_driver = {
>  	.driver		= {
>  		.name	= "kempld-wdt",
>  	},
>  	.probe		= kempld_wdt_probe,
> -	.suspend	= kempld_wdt_suspend,
> -	.resume		= kempld_wdt_resume,
> +	.suspend	= pm_ptr(kempld_wdt_suspend),
> +	.resume		= pm_ptr(kempld_wdt_resume),
>  };
>  
>  module_platform_driver(kempld_wdt_driver);
> -- 
> 2.35.1
>