On Jan 10 2017 or thereabouts, Arnd Bergmann wrote:
> The newly added driver guards its "resume" callback with an #ifdef CONFIG_PM
> that should be CONFIG_PM_SLEEP instead, leading to a warning in some configurations:
>
> drivers/platform/x86/surface3-wmi.c:248:12: error: 's3_wmi_resume' defined but not used [-Werror=unused-function]
>
> Using a __maybe_unused annotation without an #ifdef avoids the mistake more
> reliably.
>
> Fixes: 3dda3b3798f9 ("platform/x86: Add custom surface3 platform device for controlling LID")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Ouch. Good catch.
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Cheers,
Benjamin
> ---
> drivers/platform/x86/surface3-wmi.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/platform/x86/surface3-wmi.c b/drivers/platform/x86/surface3-wmi.c
> index cbf4d83a7271..6ac1d1349d7e 100644
> --- a/drivers/platform/x86/surface3-wmi.c
> +++ b/drivers/platform/x86/surface3-wmi.c
> @@ -244,13 +244,11 @@ static int s3_wmi_remove(struct platform_device *device)
> return 0;
> }
>
> -#ifdef CONFIG_PM
> -static int s3_wmi_resume(struct device *dev)
> +static int __maybe_unused s3_wmi_resume(struct device *dev)
> {
> s3_wmi_send_lid_state();
> return 0;
> }
> -#endif
> static SIMPLE_DEV_PM_OPS(s3_wmi_pm, NULL, s3_wmi_resume);
>
> static struct platform_driver s3_wmi_driver = {
> --
> 2.9.0
>
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