linux-kernel - [PATCH] Do not clobber pgdat->nr_zones during memory initialisation

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Message-ID: <20080703163638.GC18055@csn.ul.ie>
Date:	Thu, 3 Jul 2008 17:36:38 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Whitcroft <apw@...dowen.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, NeilBrown <neilb@...e.de>,
	babydr@...y-dragons.com, lee.schermerhorn@...com,
	a.beregalov@...il.com, akpm@...ux-foundation.org
Subject: [PATCH] Do not clobber pgdat->nr_zones during memory initialisation

On (03/07/08 08:37), Christoph Lameter didst pronounce:
> What a convoluted description. Simply put: We clobber the nr_zones field
> because we write beyond the bounds of the node_zonelists[] array in
> struct pglist_data.
> 

Subject: [PATCH] Do not clobber pgdat->nr_zones during memory initialisation

The nr_zones field is getting clobbered due to a write beyond the bounds of
the node_zonelists[] array in struct pglist_data.

Signed-off-by: Mel Gorman <mel@....ul.ie>
---
 mm/page_alloc.c |    1 -
 1 file changed, 1 deletion(-)

diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.26-rc8-clean/mm/page_alloc.c linux-2.6.26-rc8-fix-kswapd-on-numa/mm/page_alloc.c
--- linux-2.6.26-rc8-clean/mm/page_alloc.c	2008-06-24 18:58:20.000000000 -0700
+++ linux-2.6.26-rc8-fix-kswapd-on-numa/mm/page_alloc.c	2008-07-02 21:49:09.000000000 -0700
@@ -2328,7 +2328,6 @@ static void build_zonelists(pg_data_t *p
 static void build_zonelist_cache(pg_data_t *pgdat)
 {
 	pgdat->node_zonelists[0].zlcache_ptr = NULL;
-	pgdat->node_zonelists[1].zlcache_ptr = NULL;
 }
 
 #endif	/* CONFIG_NUMA */
--
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