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

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Date:	Wed, 05 Nov 2014 16:19:56 +0100
From:	Hans Verkuil <hansverk@...co.com>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	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 11/05/14 16:15, Boris Brezillon wrote:
> 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.

Since v4l2-mediabus.h contains struct v4l2_mbus_framefmt this header remains
a legal header, so you can't use #warning here in any case.

Regards,

	Hans

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