linux-kernel - Re: [RFC] [PATCH] virtual memmap on sparsemem v3 [3/4] static virtual mem

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Message-Id: <20061209114950.307d57ca.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Sat, 9 Dec 2006 11:49:50 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel@...r.kernel.org, clameter@...r.sgi.com,
	apw@...dowen.org
Subject: Re: [RFC] [PATCH] virtual memmap on sparsemem v3 [3/4] static
 virtual mem_map

On Fri, 8 Dec 2006 16:30:20 -0800
Andrew Morton <akpm@...l.org> wrote:

> > +#ifdef CONFIG_SPARSEMEM_VMEMMAP_STATIC
> > +#include <linux/mm_types.h>
> > +extern struct page mem_map[];
> > +#else
> >  extern struct page* mem_map;
> >  #endif
> > +#endif
> 
> This looks rather unpleasant - what went wrong here?
> 
definition of 'struct page' is necessary before declearing array[]. (for gcc-4.0)

> Would prefer to unconditionally include the header file - conditional inclusions
> like this can cause compile failures when someone changes a config option.  They
> generally raise the complexity level.
>
Okay.
Now, forward declearation of 'struct page' is in mmzone.h. 
I'll remove it and include mm_types.h instead of it.
If someone says "Don't do that", I'll look for anothere way.

-Kame


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