linux-kernel - Re: [PATCH 1/4] watchdog: at91rm9200: Remove #ifdef guards for PM related functions

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Message-ID: <cb79fe4e-1d01-4eb4-5aa8-c2e692a0c129@microchip.com>
Date:   Fri, 21 Oct 2022 07:21:25 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <paul@...pouillou.net>, <wim@...ux-watchdog.org>,
        <linux@...ck-us.net>
CC:     <linux-watchdog@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/4] watchdog: at91rm9200: Remove #ifdef guards for PM
 related functions

On 20.10.2022 21:50, Paul Cercueil wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> 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>
> ---
> Cc: Nicolas Ferre <nicolas.ferre@...rochip.com>
> Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
> Cc: Claudiu Beznea <claudiu.beznea@...rochip.com>
> Cc: linux-arm-kernel@...ts.infradead.org

Reviewed-by: Claudiu Beznea <claudiu.beznea@...rochip.com>


> 
>  drivers/watchdog/at91rm9200_wdt.c | 11 ++---------
>  drivers/watchdog/db8500_wdt.c     |  9 ++-------
>  2 files changed, 4 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/watchdog/at91rm9200_wdt.c b/drivers/watchdog/at91rm9200_wdt.c
> index 6d751eb8191d..5126454bb861 100644
> --- a/drivers/watchdog/at91rm9200_wdt.c
> +++ b/drivers/watchdog/at91rm9200_wdt.c
> @@ -278,8 +278,6 @@ static void at91wdt_shutdown(struct platform_device *pdev)
>         at91_wdt_stop();
>  }
> 
> -#ifdef CONFIG_PM
> -
>  static int at91wdt_suspend(struct platform_device *pdev, pm_message_t message)
>  {
>         at91_wdt_stop();
> @@ -293,11 +291,6 @@ static int at91wdt_resume(struct platform_device *pdev)
>         return 0;
>  }
> 
> -#else
> -#define at91wdt_suspend NULL
> -#define at91wdt_resume NULL
> -#endif
> -
>  static const struct of_device_id at91_wdt_dt_ids[] = {
>         { .compatible = "atmel,at91rm9200-wdt" },
>         { /* sentinel */ }
> @@ -308,8 +301,8 @@ static struct platform_driver at91wdt_driver = {
>         .probe          = at91wdt_probe,
>         .remove         = at91wdt_remove,
>         .shutdown       = at91wdt_shutdown,
> -       .suspend        = at91wdt_suspend,
> -       .resume         = at91wdt_resume,
> +       .suspend        = pm_ptr(at91wdt_suspend),
> +       .resume         = pm_ptr(at91wdt_resume),
>         .driver         = {
>                 .name   = "atmel_st_watchdog",
>                 .of_match_table = at91_wdt_dt_ids,
> diff --git a/drivers/watchdog/db8500_wdt.c b/drivers/watchdog/db8500_wdt.c
> index 6ed8b63d310d..97148ac0aa54 100644
> --- a/drivers/watchdog/db8500_wdt.c
> +++ b/drivers/watchdog/db8500_wdt.c
> @@ -105,7 +105,6 @@ static int db8500_wdt_probe(struct platform_device *pdev)
>         return 0;
>  }
> 
> -#ifdef CONFIG_PM
>  static int db8500_wdt_suspend(struct platform_device *pdev,
>                              pm_message_t state)
>  {
> @@ -130,15 +129,11 @@ static int db8500_wdt_resume(struct platform_device *pdev)
>         }
>         return 0;
>  }
> -#else
> -#define db8500_wdt_suspend NULL
> -#define db8500_wdt_resume NULL
> -#endif
> 
>  static struct platform_driver db8500_wdt_driver = {
>         .probe          = db8500_wdt_probe,
> -       .suspend        = db8500_wdt_suspend,
> -       .resume         = db8500_wdt_resume,
> +       .suspend        = pm_ptr(db8500_wdt_suspend),
> +       .resume         = pm_ptr(db8500_wdt_resume),
>         .driver         = {
>                 .name   = "db8500_wdt",
>         },
> --
> 2.35.1
>