linux-kernel - Re: [PATCH 11/15] [media] Deprecate v4l2_mbus

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Message-ID: <20141105161538.7a1686d5@bbrezillon>
Date:	Wed, 5 Nov 2014 16:15:38 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Sakari Ailus <sakari.ailus@....fi>
Cc:	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-api@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	Guennadi Liakhovetski <g.liakhovetski@....de>
Subject: Re: [PATCH 11/15] [media] Deprecate v4l2_mbus_pixelcode

On Wed, 5 Nov 2014 17:08:15 +0200
Sakari Ailus <sakari.ailus@....fi> wrote:

> Hi Boris,
> 
> On Tue, Nov 04, 2014 at 10:55:06AM +0100, Boris Brezillon wrote:
> > The v4l2_mbus_pixelcode enum (or its values) should be replaced by the
> > media_bus_format enum.
> > Keep this enum in v4l2-mediabus.h and create a new header containing
> > the v4l2_mbus_framefmt struct definition (which is not deprecated) so
> > that we can add a #warning statement in v4l2-mediabus.h and hopefully
> > encourage users to move to the new definitions.
> > 
> > Replace inclusion of v4l2-mediabus.h with v4l2-mbus.h in all common headers
> > and update the documentation Makefile to parse v4l2-mbus.h instead of
> > v4l2-mediabus.h.
> > 
> > Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> > ---
> >  Documentation/DocBook/media/Makefile |  2 +-
> >  include/media/v4l2-mediabus.h        |  2 +-
> >  include/uapi/linux/Kbuild            |  1 +
> >  include/uapi/linux/v4l2-mbus.h       | 35 +++++++++++++++++++++++++++++++++++
> >  include/uapi/linux/v4l2-mediabus.h   | 26 ++++----------------------
> 
> I would keep the original file name, even if the compatibility definitions
> are there. I don't see any harm in having them around as well.
> 

That's the part I was not sure about.
The goal of this patch (and the following ones) is to deprecate
v4l2_mbus_pixelcode enum and its values by adding a #warning when
v4l2-mediabus.h file is included, thus encouraging people to use new
definitions.

Do you see another solution to generate such warnings at compilation
time ?

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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