linux-kernel - Re: [PATCH v3 10/10] [media] v4l: Forbid usage of V4L2_MBUS

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Date:	Fri, 07 Nov 2014 15:47:41 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-media@...r.kernel.org, Sakari Ailus <sakari.ailus@....fi>
CC:	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 v3 10/10] [media] v4l: Forbid usage of V4L2_MBUS_FMT definitions
 inside the kernel

Nitpicks:

On 11/07/14 15:07, Boris Brezillon wrote:
> Place v4l2_mbus_pixelcode in a #ifndef __KERNEL__ section so that kernel
> users don't have access to these definitions.
> 
> We have to keep this definition for user-space users even though they're
> encouraged to move to the new media_bus_format enum.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
>  include/uapi/linux/v4l2-mediabus.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/include/uapi/linux/v4l2-mediabus.h b/include/uapi/linux/v4l2-mediabus.h
> index 3d87db7..4f31d0e 100644
> --- a/include/uapi/linux/v4l2-mediabus.h
> +++ b/include/uapi/linux/v4l2-mediabus.h
> @@ -15,6 +15,14 @@
>  #include <linux/videodev2.h>
>  #include <linux/media-bus-format.h>
>  
> +#ifndef __KERNEL__
> +
> +/*
> + * enum v4l2_mbus_pixelcode and its defintions are now deprecated, and

defintions -> definitions

> + * MEDIA_BUS_FMT_ defintions (defined in media-bus-format.h) should be

and again...

> + * used instead.

I would also add something like this:

"New defines should only be added to media-bus-format.h. The v4l2_mbus_pixelcode
enum is frozen."

> + */
> +
>  #define V4L2_MBUS_FROM_MEDIA_BUS_FMT(name)	\
>  	MEDIA_BUS_FMT_ ## name = V4L2_MBUS_FMT_ ## name
>  
> @@ -102,6 +110,7 @@ enum v4l2_mbus_pixelcode {
>  
>  	V4L2_MBUS_FROM_MEDIA_BUS_FMT(AHSV8888_1X32),
>  };
> +#endif /* __KERNEL__ */
>  
>  /**
>   * struct v4l2_mbus_framefmt - frame format on the media bus
> 

Can you move this struct forward to before the v4l2_mbus_pixelcode enum? That way
the obsolete code is at the end of the header. People might miss this struct
otherwise.

Regards,

	Hans
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