linux-kernel - Re: [patch] mm: sparsemem memory_present() memory corruption fix

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Message-ID: <20080416005203.GB26996@elte.hu>
Date:	Wed, 16 Apr 2008 02:52:03 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Lameter <clameter@....com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Yinghai.Lu@....com,
	apw@...dowen.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Joe Perches <joe@...ches.com>
Subject: Re: [patch] mm: sparsemem memory_present() memory corruption fix


* Christoph Lameter <clameter@....com> wrote:

> I wonder why this did not show up earlier in testing? Running a kernel 
> that cannot access all of memory is unusual I guess.

i guess people saw the "you are not running a PAE kernel" warning and 
went to a PAE kernel which didnt have this issue.

OTOH, quite a few testers consciously use non-PAE kernels on 4GB 
systems, so i'd not be surprised if this solved a few mystery 
regressions we have.

	Ingo
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