linux-kernel - Re: [greybus-dev] [PATCH] staging: greybus: mark PM functions as __maybe

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Date:   Thu, 18 May 2017 19:48:00 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Vaibhav Hiremath <hvaibhav.linux@...il.com>,
        Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, greybus-dev@...ts.linaro.org,
        linux-kernel@...r.kernel.org
Subject: Re: [greybus-dev] [PATCH] staging: greybus: mark PM functions as
 __maybe_unused

On 18-05-17, 15:28, Arnd Bergmann wrote:
> Enabling the arche platform for compile testing showed a harmless
> warning with CONFIG_PM=n:
> 
> drivers/staging/greybus/arche-platform.c:632:12: error: 'arche_platform_resume' defined but not used [-Werror=unused-function]
> drivers/staging/greybus/arche-platform.c:618:12: error: 'arche_platform_suspend' defined but not used [-Werror=unused-function]
> 
> This marks the functions as __maybe_unused to shut up the warnings.
> 
> Fixes: 2eccd4aa19fc ("staging: greybus: enable compile testing of arche driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/staging/greybus/arche-platform.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/greybus/arche-platform.c b/drivers/staging/greybus/arche-platform.c
> index 5bce5e039596..eced2d26467b 100644
> --- a/drivers/staging/greybus/arche-platform.c
> +++ b/drivers/staging/greybus/arche-platform.c
> @@ -615,7 +615,7 @@ static int arche_platform_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static int arche_platform_suspend(struct device *dev)
> +static __maybe_unused int arche_platform_suspend(struct device *dev)
>  {
>  	/*
>  	 * If timing profile premits, we may shutdown bridge
> @@ -629,7 +629,7 @@ static int arche_platform_suspend(struct device *dev)
>  	return 0;
>  }
>  
> -static int arche_platform_resume(struct device *dev)
> +static __maybe_unused int arche_platform_resume(struct device *dev)
>  {
>  	/*
>  	 * Atleast for ES2 we have to meet the delay requirement between

Is __maybe_unused the more preferred way than putting these routines
under CONFIG_PM_SLEEP ifdef ?

-- 
viresh