Re: Confusion in usr/include/linux/videodev.h

From: Jaswinder Singh Rajput
Date: Tue Jan 20 2009 - 23:44:20 EST

On Wed, Jan 21, 2009 at 7:20 AM, Mauro Carvalho Chehab
<mchehab@xxxxxxxxxxxxx> wrote:
> On Wed, 21 Jan 2009 07:10:38 +0530
> Jaswinder Singh Rajput <jaswinder@xxxxxxxxxx> wrote:
>> usr/include/linux/videodev.h is giving 2 warnings in 'make headers_check':
>> usr/include/linux/videodev.h:19: leaks CONFIG_VIDEO to userspace where it is not valid
>> usr/include/linux/videodev.h:314: leaks CONFIG_VIDEO to userspace where it is not valid
>> Whole file is covered with #if defined(CONFIG_VIDEO_V4L1_COMPAT) || !defined (__KERNEL__)
>> It means this file is only valid for kernel mode if CONFIG_VIDEO_V4L1_COMPAT is defined but in user mode it is always valid.
>> Can we choose some better alternative Or can we use this file as:
>> #include <linux/videodev.h>
>> #endif
> This is somewhat like what we have on audio devices (where there are OSS and ALSA API's).
> V4L1 is the old deprecated userspace API for video devices. It is still
> required by some userspace applications. So, on userspace, it should be
> included. Also, this allows that one userspace app to be compatible with both
> V4L2 API (the current one) and the legacy V4L1 one.
> It should be noticed that are still a few drivers using the legacy API yet to
> be converted.

If you have no objections then I will make a patchset which do followings:
1. Remove #if defined(CONFIG_VIDEO_V4L1_COMPAT) || !defined
(__KERNEL__) from include/linux/videodev.h
2. cover all #include <linux/videodev.h> with #ifdef

By this way, we can satisfy both kernel space and userspace issue and
also get rid of above warnings.

If you have better suggestion then let me know.


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