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

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Date:	Mon, 21 Feb 2011 09:36:40 +0200
From:	Felipe Balbi <balbi@...com>
To:	David Cohen <dacohen@...il.com>
Cc:	balbi@...com,
	Sakari Ailus <sakari.ailus@...well.research.nokia.com>,
	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,

On Sat, Feb 19, 2011 at 06:04:58PM +0200, David Cohen wrote:
> > I have to disagree. The fundamental problem is the circular dependency
> > between those two files:
> >
> > sched.h uses wait_queue_head_t defined in wait.h
> > wait.h uses TASK_* defined in sched.h
> >
> > So, IMO the real fix would be clear out the circular dependency. Maybe
> > introducing <linux/task.h> to define those TASK_* symbols and include
> > that on sched.h and wait.h
> >
> > Just dig a quick and dirty to try it out and works like a charm
> 
> We have 2 problems:
>  - omap24xxcam compilation broken
>  - circular dependency between sched.h and wait.h
> 
> To fix the broken compilation we can do what the rest of the kernel is
> doing, which is to include sched.h.
> Then, the circular dependency is fixed by some different approach
> which would probably change *all* current usage of TASK_*.

considering that 1 is caused by 2 I would fix 2.

> IMO, there's no need to create a dependency between those issues.

There's no dependency between them, it's just that the root cause for
this problem is a circular dependency between wait.h and sched.h

-- 
balbi
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