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

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Message-Id: <20080416104854.b481237e.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 16 Apr 2008 10:48:54 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <clameter@....com>,
	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
Subject: Re: [patch] mm: sparsemem memory_present() memory corruption fix


I'm sorry to be too late here..

On Wed, 16 Apr 2008 02:03:56 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  mm/sparse.c |   10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> Index: linux/mm/sparse.c
> ===================================================================
> --- linux.orig/mm/sparse.c
> +++ linux/mm/sparse.c
> @@ -149,8 +149,18 @@ static inline int sparse_early_nid(struc
>  /* Record a memory area against a node. */
>  void __init memory_present(int nid, unsigned long start, unsigned long end)
>  {
> +	unsigned long max_arch_pfn = 1ULL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);
>  	unsigned long pfn;
>  
how about

max_arch_pfn = NR_MEM_SECTIONS * PAGES_PER_SECTION.

?
Thanks,
-Kame

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