linux-kernel - Re: [PATCH v2 04/22] i2c: davinci: Remove #ifdef guards for PM related functions

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Message-ID: <CAMRc=MdR5K-mZZzKKgBgKUgEoWUT_41t6FDUsLB2Q-VQaOhOVA@mail.gmail.com>
Date:   Thu, 27 Jul 2023 09:40:45 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Wolfram Sang <wsa@...nel.org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 04/22] i2c: davinci: Remove #ifdef guards for PM
 related functions

On Sat, Jul 22, 2023 at 1:51 PM Paul Cercueil <paul@...pouillou.net> wrote:
>
> Use the new PM macros for the suspend and resume functions to be
> automatically dropped by the compiler when CONFIG_PM or
> CONFIG_PM_SLEEP are disabled, without having to use #ifdef guards.
>
> This has the advantage of always compiling these functions in,
> independently of any Kconfig option. Thanks to that, bugs and other
> regressions are subsequently easier to catch.
>
> Note that the behaviour is slightly different than before; the original
> code wrapped the suspend/resume with #ifdef CONFIG_PM guards, which
> resulted in these functions being compiled in but never used when
> CONFIG_PM_SLEEP was disabled.
>
> Now, those functions are only compiled in when CONFIG_PM_SLEEP is
> enabled.
>
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>
> ---
> Cc: Bartosz Golaszewski <brgl@...ev.pl>
> Cc: linux-arm-kernel@...ts.infradead.org
> ---
>  drivers/i2c/busses/i2c-davinci.c | 12 +++---------
>  1 file changed, 3 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
> index 71b60778c643..52527189a7bf 100644
> --- a/drivers/i2c/busses/i2c-davinci.c
> +++ b/drivers/i2c/busses/i2c-davinci.c
> @@ -902,7 +902,6 @@ static void davinci_i2c_remove(struct platform_device *pdev)
>         pm_runtime_disable(dev->dev);
>  }
>
> -#ifdef CONFIG_PM
>  static int davinci_i2c_suspend(struct device *dev)
>  {
>         struct davinci_i2c_dev *i2c_dev = dev_get_drvdata(dev);
> @@ -926,15 +925,10 @@ static int davinci_i2c_resume(struct device *dev)
>  static const struct dev_pm_ops davinci_i2c_pm = {
>         .suspend        = davinci_i2c_suspend,
>         .resume         = davinci_i2c_resume,
> -       SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> -                                     pm_runtime_force_resume)
> +       NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> +                                 pm_runtime_force_resume)
>  };
>
> -#define davinci_i2c_pm_ops (&davinci_i2c_pm)
> -#else
> -#define davinci_i2c_pm_ops NULL
> -#endif
> -
>  static const struct platform_device_id davinci_i2c_driver_ids[] = {
>         { .name = "i2c_davinci", },
>         { /* sentinel */ }
> @@ -947,7 +941,7 @@ static struct platform_driver davinci_i2c_driver = {
>         .id_table       = davinci_i2c_driver_ids,
>         .driver         = {
>                 .name   = "i2c_davinci",
> -               .pm     = davinci_i2c_pm_ops,
> +               .pm     = pm_sleep_ptr(&davinci_i2c_pm),
>                 .of_match_table = davinci_i2c_of_match,
>         },
>  };
> --
> 2.40.1
>

Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>