linux-kernel - Re: [PATCH v2] ahci: st: Switch from CONFIG_PM_SLEEP guards to pm_sleep

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Message-ID: <07a7177d-7705-4eb5-a11e-02a9429ffac2@kernel.org>
Date: Fri, 10 Jan 2025 14:19:06 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Raphael Gallais-Pou <rgallaispou@...il.com>,
 Patrice Chotard <patrice.chotard@...s.st.com>,
 Niklas Cassel <cassel@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-ide@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ahci: st: Switch from CONFIG_PM_SLEEP guards to
 pm_sleep_ptr()

On 1/10/25 02:54, Raphael Gallais-Pou wrote:
> Letting the compiler remove these functions when the kernel is built
> without CONFIG_PM_SLEEP support is simpler and less error prone than the
> use of #ifdef based kernel configuration guards.
> 
> Signed-off-by: Raphael Gallais-Pou <rgallaispou@...il.com>
> ---
> Changes in v2:
>   - Split serie in single patches
>   - Remove irrelevant 'Link:' from commit log
>   - Link to v1: https://lore.kernel.org/r/20241229-update_pm_macro-v1-4-c7d4c4856336@gmail.com
> ---
>  drivers/ata/ahci_st.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/ata/ahci_st.c b/drivers/ata/ahci_st.c
> index 6b9b4a1dfa15..4336c8a6e208 100644
> --- a/drivers/ata/ahci_st.c
> +++ b/drivers/ata/ahci_st.c
> @@ -176,7 +176,6 @@ static int st_ahci_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -#ifdef CONFIG_PM_SLEEP
>  static int st_ahci_suspend(struct device *dev)
>  {
>  	struct ata_host *host = dev_get_drvdata(dev);
> @@ -221,9 +220,8 @@ static int st_ahci_resume(struct device *dev)
>  
>  	return ahci_platform_resume_host(dev);
>  }
> -#endif

I do not think you can remove the ifdef here. Otherwise, there is going to be a
compilation warning when CONFIG_PM_SLEEP is not enabled. No ?

>  
> -static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
> +static DEFINE_SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
>  
>  static const struct of_device_id st_ahci_match[] = {
>  	{ .compatible = "st,ahci", },
> @@ -234,7 +232,7 @@ MODULE_DEVICE_TABLE(of, st_ahci_match);
>  static struct platform_driver st_ahci_driver = {
>  	.driver = {
>  		.name = DRV_NAME,
> -		.pm = &st_ahci_pm_ops,
> +		.pm = pm_sleep_ptr(&st_ahci_pm_ops),
>  		.of_match_table = st_ahci_match,
>  	},
>  	.probe = st_ahci_probe,


-- 
Damien Le Moal
Western Digital Research