linux-kernel - Re: [PATCH] drm/tegra: mark t186 display hub PM functions __maybe

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Date:   Fri, 15 Dec 2017 16:10:30 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/tegra: mark t186 display hub PM functions
 __maybe_unused

On 15.12.2017 15:51, Arnd Bergmann wrote:
> The newly introduced driver has optional suspend/resume functions,
> causing a warning when CONFIG_PM is disabled:
> 
> drivers/gpu/drm/tegra/hub.c:749:12: error: 'tegra_display_hub_resume' defined but not used [-Werror=unused-function]
> drivers/gpu/drm/tegra/hub.c:733:12: error: 'tegra_display_hub_suspend' defined but not used [-Werror=unused-function]
> 
> This marks them __maybe_unused to shut up the warnings.
> 
> Fixes: c4755fb9064f ("drm/tegra: Add Tegra186 display hub support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/gpu/drm/tegra/hub.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/tegra/hub.c b/drivers/gpu/drm/tegra/hub.c
> index cccd44711d68..f4911feda9ff 100644
> --- a/drivers/gpu/drm/tegra/hub.c
> +++ b/drivers/gpu/drm/tegra/hub.c
> @@ -730,7 +730,7 @@ static int tegra_display_hub_remove(struct platform_device *pdev)
>  	return err;
>  }
>  
> -static int tegra_display_hub_suspend(struct device *dev)
> +static int __maybe_unused tegra_display_hub_suspend(struct device *dev)
>  {
>  	struct tegra_display_hub *hub = dev_get_drvdata(dev);
>  	int err;
> @@ -746,7 +746,7 @@ static int tegra_display_hub_suspend(struct device *dev)
>  	return 0;
>  }
>  
> -static int tegra_display_hub_resume(struct device *dev)
> +static int __maybe_unused tegra_display_hub_resume(struct device *dev)
>  {
>  	struct tegra_display_hub *hub = dev_get_drvdata(dev);
>  	int err;
> 

Probably would be better to put '#ifdef CONFIG_PM' around these functions for
the consistency with the other drm/tegra files.