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

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Date:	Tue, 15 Apr 2008 17:45:21 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Ingo Molnar <mingo@...e.hu>
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

> fix memory corruption and crash on 32-bit x86 systems.
> 
> if a !PAE x86 kernel is booted on a 32-bit system with more than
> 4GB of RAM, then we call memory_present() with a start/end that
> goes outside the scope of MAX_PHYSMEM_BITS.

So its a general issue that has been there for years that we are now 
noticing because we are now testing with memory sizes > 4GB. This also 
affects the enterprise releases (SLES10, RHEL5). Argh!

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


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