linux-kernel - Re: [PATCH resend] video: omap24xxcam: Fix compilation

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Date:	Sat, 19 Feb 2011 13:35:09 +0200
From:	David Cohen <dacohen@...il.com>
To:	Sakari Ailus <sakari.ailus@...well.research.nokia.com>,
	balbi@...com
Cc:	Thomas Weber <weber@...science.de>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	linux-omap@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Hans Verkuil <hverkuil@...all.nl>, Tejun Heo <tj@...nel.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH resend] video: omap24xxcam: Fix compilation

Hi Sakari and Felipe,

On Tue, Feb 15, 2011 at 2:17 PM, Sakari Ailus
<sakari.ailus@...well.research.nokia.com> wrote:
> Felipe Balbi wrote:
>> Hi,
>>
>> On Tue, Feb 15, 2011 at 12:50:12PM +0100, Thomas Weber wrote:
>>> Hello Felipe,
>>>
>>> in include/linux/wait.h
>>>
>>> #define wake_up(x)            __wake_up(x, TASK_NORMAL, 1, NULL)
>>
>> aha, now I get it, so shouldn't the real fix be including <linux/sched.h>
>> on <linux/wait.h>, I mean, it's <linuux/wait.h> who uses a symbol
>> defined in <linux/sched.h>, right ?

That's a tricky situation. linux/sched.h includes indirectly
linux/completion.h which includes linux/wait.h.
By including sched.h in wait.h, the side effect is completion.h will
then include a blank wait.h file and trigger a compilation error every
time wait.h is included by any file.

>
> Surprisingly many other files still don't seem to be affected. But this
> is actually a better solution (to include sched.h in wait.h).

It does not affect all files include wait.h because TASK_* macros are
used with #define statements only. So it has no effect unless some
file tries to use a macro which used TASK_*. It seems the usual on
kernel is to include both wait.h and sched.h when necessary.
IMO your patch is fine.

Br,

David

>
> --
> Sakari Ailus
> sakari.ailus@...well.research.nokia.com
> --
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