linux-kernel - Re: [RFC] Circular include dependencies

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Date:	Fri, 23 May 2008 18:17:28 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Russell King <rmk+lkml@....linux.org.uk>
Cc:	Linux Kernel List <linux-kernel@...r.kernel.org>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org
Subject: Re: [RFC] Circular include dependencies

On Fri, 23 May 2008 14:20:34 +0100 Russell King <rmk+lkml@....linux.org.uk> wrote:

> Hi,
> 
> Having discovered some circular include dependencies in the ARM header
> files which were causing build issues, I created a script to walk ARM
> includes and report any similar issues found - which includes traversing
> any referenced linux/ includes.
> 
> It identified the following two in include/linux/:
> 
>   linux/mmzone.h <- linux/memory_hotplug.h <- linux/mmzone.h
>   linux/mmzone.h <- linux/topology.h <- linux/mmzone.h
> 
> Checking them by hand reveals that these are real.  Whether they're
> capable of causing a problem or not, I'm not going to comment on.
> However, they're not a good idea and someone should probably look at
> resolving the loops.

(cc's added).

Thanks.

I'm not sure who we could tap for the topology.h one.

A suitable (and often good) way of solving this is to identify the
things which a.h needs from b.h and hoist them out into a new c.h and
include that from both a.h and b.h.

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