linux-kernel - Re: [PATCH] platform/surface: mark PM functions as __maybe

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Date:   Sun, 3 Jan 2021 16:33:37 +0100
From:   Maximilian Luz <luzmaximilian@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <mgross@...ux.intel.com>
Cc:     Arnd Bergmann <arnd@...db.de>, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/surface: mark PM functions as __maybe_unused

On 1/3/21 3:04 PM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> When CONFIG_PM is disabled, the compiler produces harmless warnings:
> 
> drivers/platform/surface/surface_gpe.c:184:12: error: unused function 'surface_gpe_suspend' [-Werror,-Wunused-function]
> static int surface_gpe_suspend(struct device *dev)
> drivers/platform/surface/surface_gpe.c:189:12: error: unused function 'surface_gpe_resume' [-Werror,-Wunused-function]
> static int surface_gpe_resume(struct device *dev)
> 
> Mark these as __maybe_unused to shut up the warning.
> 
> Fixes: 274335f1c557 ("platform/surface: Add Driver to set up lid GPEs on MS Surface device")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>   drivers/platform/surface/surface_gpe.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/surface/surface_gpe.c b/drivers/platform/surface/surface_gpe.c
> index e49e5d6d5d4e..86f6991b1215 100644
> --- a/drivers/platform/surface/surface_gpe.c
> +++ b/drivers/platform/surface/surface_gpe.c
> @@ -181,12 +181,12 @@ static int surface_lid_enable_wakeup(struct device *dev, bool enable)
>   	return 0;
>   }
>   
> -static int surface_gpe_suspend(struct device *dev)
> +static int __maybe_unused surface_gpe_suspend(struct device *dev)
>   {
>   	return surface_lid_enable_wakeup(dev, true);
>   }
>   
> -static int surface_gpe_resume(struct device *dev)
> +static int __maybe_unused surface_gpe_resume(struct device *dev)
>   {
>   	return surface_lid_enable_wakeup(dev, false);
>   }
> 

Hi,

a patch doing this exact thing has already been submitted, but has yet to
be picked up:

   https://www.spinics.net/lists/platform-driver-x86/msg23888.html

Thanks,
Max