linux-kernel - Re: [PATCH] Tight check of pfn_valid on sparsemem

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Message-ID: <alpine.DEB.2.00.1007270929290.28648@router.home>
Date:	Tue, 27 Jul 2010 09:34:59 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Minchan Kim <minchan.kim@...il.com>
cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Milton Miller <miltonm@....com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <linux@....linux.org.uk>,
	Mel Gorman <mel@....ul.ie>,
	Johannes Weiner <hannes@...xchg.org>,
	Kukjin Kim <kgene.kim@...sung.com>
Subject: Re: [PATCH] Tight check of pfn_valid on sparsemem - v4

On Tue, 27 Jul 2010, Minchan Kim wrote:

> But in fact I have a concern to use PG_reserved since it can be used
> afterward pfn_valid normally to check hole in non-hole system. So I
> think it's redundant.

PG_reserved is already used to mark pages not handled by the page
allocator (see mmap_init_zone).


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