linux-kernel - Re: [PATCH v2 4/6] usb: ohci-exynos: Switch from CONFIG_PM guards to pm

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Date: Thu, 4 Apr 2024 14:27:06 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: Anand Moon <linux.amoon@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
  Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
  Alim Akhtar <alim.akhtar@...sung.com>,
  Christophe JAILLET <christophe.jaillet@...adoo.fr>,
  Johan Hovold <johan@...nel.org>, linux-usb@...r.kernel.org,
  linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
  linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/6] usb: ohci-exynos: Switch from CONFIG_PM guards to
 pm_ptr()

On Thu, Apr 04, 2024 at 12:43:20PM +0530, Anand Moon wrote:
> Use the new PM macros for the suspend and resume functions to be
> automatically dropped by the compiler when CONFIG_PM are disabled,
> without having to use #ifdef guards. If CONFIG_PM unused,
> they will simply be discarded by the compiler.
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
> v2: new changes in this series.
> ---

Acked-by: Alan Stern <stern@...land.harvard.edu>

>  drivers/usb/host/ohci-exynos.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
> index 85d04ae0ae40..3e647e0b341d 100644
> --- a/drivers/usb/host/ohci-exynos.c
> +++ b/drivers/usb/host/ohci-exynos.c
> @@ -212,8 +212,7 @@ static void exynos_ohci_shutdown(struct platform_device *pdev)
>  		hcd->driver->shutdown(hcd);
>  }
>  
> -#ifdef CONFIG_PM
> -static int exynos_ohci_suspend(struct device *dev)
> +static int __maybe_unused exynos_ohci_suspend(struct device *dev)
>  {
>  	struct usb_hcd *hcd = dev_get_drvdata(dev);
>  	struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
> @@ -230,7 +229,7 @@ static int exynos_ohci_suspend(struct device *dev)
>  	return 0;
>  }
>  
> -static int exynos_ohci_resume(struct device *dev)
> +static int __maybe_unused exynos_ohci_resume(struct device *dev)
>  {
>  	struct usb_hcd *hcd			= dev_get_drvdata(dev);
>  	struct exynos_ohci_hcd *exynos_ohci	= to_exynos_ohci(hcd);
> @@ -249,10 +248,6 @@ static int exynos_ohci_resume(struct device *dev)
>  
>  	return 0;
>  }
> -#else
> -#define exynos_ohci_suspend	NULL
> -#define exynos_ohci_resume	NULL
> -#endif
>  
>  static const struct ohci_driver_overrides exynos_overrides __initconst = {
>  	.extra_priv_size =	sizeof(struct exynos_ohci_hcd),
> @@ -277,7 +272,7 @@ static struct platform_driver exynos_ohci_driver = {
>  	.shutdown	= exynos_ohci_shutdown,
>  	.driver = {
>  		.name	= "exynos-ohci",
> -		.pm	= &exynos_ohci_pm_ops,
> +		.pm	= pm_ptr(&exynos_ohci_pm_ops),
>  		.of_match_table	= of_match_ptr(exynos_ohci_match),
>  	}
>  };
> -- 
> 2.44.0
>