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

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Message-ID: <20110221122109.GA23087@legolas.emea.dhcp.ti.com>
Date:	Mon, 21 Feb 2011 14:21:09 +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

On Mon, Feb 21, 2011 at 02:09:07PM +0200, David Cohen wrote:
> On Mon, Feb 21, 2011 at 9:36 AM, Felipe Balbi <balbi@...com> wrote:
> > 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
> 
> I did a try to fix this circular dependency and the comment I got was
> to include sched.h in omap24xxcam.c file:
> http://marc.info/?l=linux-omap&m=129828637120270&w=2
> 
> I'm working to remove v4l2 internal device interface from omap24xxcam
> and then I need this driver's compilation fixed.
> The whole kernel is including sched.h when wake_up*() macro is used,
> so this should be our first solution IMO.
> As I said earlier, no need to make this compilation fix be dependent
> of wait.h fix (if it's really going to be changed).
> 
> I think we should proceed with this patch.

I would wait to hear from Ingo or Peter who are the maintainers for that
part, but fine by me.

-- 
balbi
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