linux-kernel - Re: [PATCH 8/8] drm/bridge: cdns: mark PM functions as __maybe

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Date:   Mon, 28 May 2018 16:32:43 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        David Airlie <airlied@...ux.ie>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Eric Anholt <eric@...olt.net>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>
Subject: Re: [PATCH 8/8] drm/bridge: cdns: mark PM functions as
 __maybe_unused

+Thierry

Hi Arnd,

On Fri, 25 May 2018 17:50:15 +0200
Arnd Bergmann <arnd@...db.de> wrote:

> These two functions are unused in some configurations, and using __maybe_unused
> is the easiest way to shut up the harmless warnings:
> 
> drivers/gpu/drm/bridge/cdns-dsi.c:1353:12: error: 'cdns_dsi_suspend' defined but not used [-Werror=unused-function]
>  static int cdns_dsi_suspend(struct device *dev)
>             ^~~~~~~~~~~~~~~~
> drivers/gpu/drm/bridge/cdns-dsi.c:1340:12: error: 'cdns_dsi_resume' defined but not used [-Werror=unused-function]
>  static int cdns_dsi_resume(struct device *dev)
> 
> Fixes: e19233955d9e ("drm/bridge: Add Cadence DSI driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Hm, I thought such a patch had already been applied by Thierry [1].

[1]https://www.spinics.net/lists/dri-devel/msg174363.html

> ---
>  drivers/gpu/drm/bridge/cdns-dsi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/cdns-dsi.c b/drivers/gpu/drm/bridge/cdns-dsi.c
> index c255fc3e1be5..f2d43f24acfb 100644
> --- a/drivers/gpu/drm/bridge/cdns-dsi.c
> +++ b/drivers/gpu/drm/bridge/cdns-dsi.c
> @@ -1337,7 +1337,7 @@ static const struct mipi_dsi_host_ops cdns_dsi_ops = {
>  	.transfer = cdns_dsi_transfer,
>  };
>  
> -static int cdns_dsi_resume(struct device *dev)
> +static int __maybe_unused cdns_dsi_resume(struct device *dev)
>  {
>  	struct cdns_dsi *dsi = dev_get_drvdata(dev);
>  
> @@ -1350,7 +1350,7 @@ static int cdns_dsi_resume(struct device *dev)
>  	return 0;
>  }
>  
> -static int cdns_dsi_suspend(struct device *dev)
> +static int __maybe_unused cdns_dsi_suspend(struct device *dev)
>  {
>  	struct cdns_dsi *dsi = dev_get_drvdata(dev);
>