linux-kernel - Re: drm/layerscape: Add Freescale DCU DRM driver

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Date:	Fri, 21 Aug 2015 15:41:16 +0200
From:	Andreas Ruprecht <andreas.ruprecht@....de>
To:	Jianwei Wang <jianwei.wang.chn@...il.com>
CC:	linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Xiubo Li <lixiubo@...s.chinamobile.com>,
	Alison Wang <b18965@...escale.com>,
	Valentin Rothberg <valentinrothberg@...il.com>,
	Stefan Hengelein <stefan.hengelein@....de>
Subject: Re: drm/layerscape: Add Freescale DCU DRM driver

Hi Jianwei,

your commit 109eee2f2a18 ("drm/layerscape: Add Freescale DCU DRM
driver") showed up in linux-next today (i.e., next-20150821). I noticed
it because we are running a daily analysis on the newest linux-next tree
as part of our research.

In the source code of fsl_dcu_drm_drv.c, there is the following #ifdef:
 #ifdef CONFIG_COMPAT
        .compat_ioctl   = drm_compat_ioctl,
 #endif

The Kconfig option for the driver, however, states that the driver can
only be built with CONFIG_ARM enabled:

config DRM_FSL_DCU
       tristate "DRM Support for Freescale DCU"
       depends on DRM && OF && ARM
       [...]

Inside arch/arm/, however, there is no definition of CONFIG_COMPAT (note
that there is one in arch/arm64/, but the driver explicitely needs
CONFIG_ARM), so the #ifdef block above can never be compiled in the
current state. Is this intended?

Regards,

Andreas
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