linux-kernel - Re: [PATCH v2 21/22] i2c: virtio: Remove #ifdef guards for PM related functions

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Date:   Sat, 22 Jul 2023 21:06:26 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Wolfram Sang <wsa@...nel.org>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Conghui Chen <conghui.chen@...el.com>,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 21/22] i2c: virtio: Remove #ifdef guards for PM
 related functions

As the build bot noticed - this patch is invalid as the
virtio_driver.{freeze,restore} callbacks are guarded by #ifdefs.

Feel free to apply the rest (if everybody is happy with them) and I'll
respin this one.

Cheers,
-Paul

Le samedi 22 juillet 2023 à 13:53 +0200, Paul Cercueil a écrit :
> 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.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> 
> ---
> Cc: Conghui Chen <conghui.chen@...el.com>
> Cc: Viresh Kumar <viresh.kumar@...aro.org>
> Cc: virtualization@...ts.linux-foundation.org
> ---
>  drivers/i2c/busses/i2c-virtio.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-virtio.c
> b/drivers/i2c/busses/i2c-virtio.c
> index 4b9536f50800..c60ae531ba57 100644
> --- a/drivers/i2c/busses/i2c-virtio.c
> +++ b/drivers/i2c/busses/i2c-virtio.c
> @@ -243,7 +243,6 @@ static struct virtio_device_id id_table[] = {
>  };
>  MODULE_DEVICE_TABLE(virtio, id_table);
>  
> -#ifdef CONFIG_PM_SLEEP
>  static int virtio_i2c_freeze(struct virtio_device *vdev)
>  {
>         virtio_i2c_del_vqs(vdev);
> @@ -254,7 +253,6 @@ static int virtio_i2c_restore(struct
> virtio_device *vdev)
>  {
>         return virtio_i2c_setup_vqs(vdev->priv);
>  }
> -#endif
>  
>  static const unsigned int features[] = {
>         VIRTIO_I2C_F_ZERO_LENGTH_REQUEST,
> @@ -269,10 +267,8 @@ static struct virtio_driver virtio_i2c_driver =
> {
>         .driver                 = {
>                 .name   = "i2c_virtio",
>         },
> -#ifdef CONFIG_PM_SLEEP
> -       .freeze = virtio_i2c_freeze,
> -       .restore = virtio_i2c_restore,
> -#endif
> +       .freeze                 = pm_sleep_ptr(virtio_i2c_freeze),
> +       .restore                = pm_sleep_ptr(virtio_i2c_restore),
>  };
>  module_virtio_driver(virtio_i2c_driver);
>