linux-kernel - Re: [PATCH v2 1/1] headers: fix circular dependency between linux/sched.h and linux/wait.h

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Date:	Mon, 21 Feb 2011 16:54:37 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Cohen <dacohen@...il.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu,
	linux-omap@...r.kernel.org, linux-media@...r.kernel.org,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH v2 1/1] headers: fix circular dependency between
 linux/sched.h and linux/wait.h

On Mon, 2011-02-21 at 16:38 +0200, David Cohen wrote:
> Currently sched.h and wait.h have circular dependency between both.
> wait.h defines macros wake_up*() which use macros TASK_* defined by
> sched.h. But as sched.h indirectly includes wait.h, such wait.h header
> file can't include sched.h too. The side effect is when some file
> includes wait.h and tries to use its wake_up*() macros, it's necessary
> to include sched.h also.
> This patch moves all TASK_* macros from linux/sched.h to a new header
> file linux/task_state.h. This way, both sched.h and wait.h can include
> task_state.h and fix the circular dependency. No need to include sched.h
> anymore when wake_up*() macros are used. 

I think Alexey already told you what you done wrong.

Also, I really don't like the task_state.h header, it assumes a lot of
things it doesn't include itself and only works because its using macros
and not inlines at it probably should.


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