linux-kernel - Re: [PATCH][2.6.20-rc1-mm1] sparsemem vmem_map optimzed pfn

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Message-ID: <Pine.LNX.4.64.0612161038080.5044@schroedinger.engr.sgi.com>
Date:	Sat, 16 Dec 2006 10:38:53 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...l.org>,
	clameter@...r.sgi.com, apw@...dowen.org,
	Andrew Morton <akpm@...l.org>, heiko.carstens@...ibm.com,
	bob.picco@...com
Subject: Re: [PATCH][2.6.20-rc1-mm1] sparsemem vmem_map optimzed pfn_valid()
 [0/2]

On Sat, 16 Dec 2006, KAMEZAWA Hiroyuki wrote:

> By this, we'll not access mem_section[] in usual ops.

Why do we need mem_section? We have a page table that fulfills the same 
role.
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