From: Daniel Yeisley <dan.yeisley@unisys.com>
Date: Fri, 3 Nov 2006 06:07:14 +0000 (-0800)
Subject: [PATCH] init_reap_node() initialization fix
X-Git-Tag: v2.6.19-rc5~43
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7f6b8876c7e66b0d15af134e2a5b87e55514eb6d;p=linux-2.6

[PATCH] init_reap_node() initialization fix

It looks like there is a bug in init_reap_node() in slab.c that can cause
multiple oops's on certain ES7000 configurations.  The variable reap_node
is defined per cpu, but only initialized on a single CPU.  This causes an
oops in next_reap_node() when __get_cpu_var(reap_node) returns the wrong
value.  Fix is below.

Signed-off-by: Dan Yeisley <dan.yeisley@unisys.com>
Cc: Andi Kleen <ak@suse.de>
Acked-by: Christoph Lameter <clameter@engr.sgi.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/mm/slab.c b/mm/slab.c
index 84c631f307..3c4a7e34ed 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -883,7 +883,7 @@ static void init_reap_node(int cpu)
 	if (node == MAX_NUMNODES)
 		node = first_node(node_online_map);
 
-	__get_cpu_var(reap_node) = node;
+	per_cpu(reap_node, cpu) = node;
 }
 
 static void next_reap_node(void)