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 18:27:56 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	David Cohen <dacohen@...il.com>, 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 02/21, Oleg Nesterov wrote:
>
> On 02/21, Peter Zijlstra wrote:
> >
> > afaict its needed because struct signal_struct and struct sighand_struct
> > include a wait_queue_head_t. The inclusion seems to come through
> > completion.h, but afaict we don't actually need to include completion.h
> > because all we have is a pointer to a completion, which is perfectly
> > fine with an incomplete type.
> >
> > This all would suggest we move the signal bits into their own header
> > (include/linux/signal.h already exists and seems inviting).
>
> Agreed, sched.h contatins a lot of garbage, including the signal bits.
>
> As for signal_struct in particular I am not really sure, it is just
> misnamed. It is in fact "struct process" or "struct thread_group". But
> dequeue_signal/etc should go into signal.h.
>
> The only problem, it is not clear how to test such a change.

Ah. sched.h includes signal.h, the testing is not the problem.

So, we can (at least) safely move some declarations.

Oleg.

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