Date: Fri, 25 Jul 2008 02:25:47 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Adrian Bunk <bunk@kernel.org>
Cc: Andrea Righi <righi.andrea@gmail.com>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: PAGE_ALIGN() compile breakage
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On Fri, 25 Jul 2008 12:14:55 +0300 Adrian Bunk <bunk@kernel.org> wrote:

> Ideally, all headers should be self-contained. IOW, they should #include 
> everything they use.

Yup.  And the core reason for our headers mess is that the headers do
too much stuff, and cnosequently demand a large dependency trail.

> But TASK_UNMAPPED_BASE in asm/processor.h on some architectures uses 
> PAGE_ALIGN() that got moved from asm/page.h to linux/mm.h .

Probably mm.h should be split up - put the simple things (usually
declarations) into one "early" header file and leave the more
heavyweight things (usually implementations) in mm.h.
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