linux-kernel - Re: [PATCH 5/8] watchdog: sama5d4_wdt: Remove #ifdef guards for PM related functions

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Message-ID: <8b264c68-fd88-2231-7704-7c711b77e048@microchip.com>
Date:   Thu, 30 Jun 2022 08:25:44 +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 5/8] watchdog: sama5d4_wdt: Remove #ifdef guards for PM
 related functions

On 28.06.2022 22:34, Paul Cercueil wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Use the new LATE_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>
> 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/sama5d4_wdt.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/watchdog/sama5d4_wdt.c b/drivers/watchdog/sama5d4_wdt.c
> index ec20ad4e534f..aeee934ca51b 100644
> --- a/drivers/watchdog/sama5d4_wdt.c
> +++ b/drivers/watchdog/sama5d4_wdt.c
> @@ -339,7 +339,6 @@ static const struct of_device_id sama5d4_wdt_of_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, sama5d4_wdt_of_match);
> 
> -#ifdef CONFIG_PM_SLEEP
>  static int sama5d4_wdt_suspend_late(struct device *dev)
>  {
>         struct sama5d4_wdt *wdt = dev_get_drvdata(dev);
> @@ -366,18 +365,17 @@ static int sama5d4_wdt_resume_early(struct device *dev)
> 
>         return 0;
>  }
> -#endif
> 
>  static const struct dev_pm_ops sama5d4_wdt_pm_ops = {
> -       SET_LATE_SYSTEM_SLEEP_PM_OPS(sama5d4_wdt_suspend_late,
> -                       sama5d4_wdt_resume_early)
> +       LATE_SYSTEM_SLEEP_PM_OPS(sama5d4_wdt_suspend_late,
> +                                sama5d4_wdt_resume_early)
>  };
> 
>  static struct platform_driver sama5d4_wdt_driver = {
>         .probe          = sama5d4_wdt_probe,
>         .driver         = {
>                 .name   = "sama5d4_wdt",
> -               .pm     = &sama5d4_wdt_pm_ops,
> +               .pm     = pm_sleep_ptr(&sama5d4_wdt_pm_ops),
>                 .of_match_table = sama5d4_wdt_of_match,
>         }
>  };
> --
> 2.35.1
>