releases/2.6.18.3/init_reap_node-initialization-fix.patch

   1 From 7f6b8876c7e66b0d15af134e2a5b87e55514eb6d Mon Sep 17 00:00:00 2001
   2 Message-Id: <200611030607.kA367ECC010756@shell0.pdx.osdl.net>
   3 From: Daniel Yeisley <dan.yeisley@unisys.com>
   4 Date: Thu, 2 Nov 2006 22:07:14 -0800
   5 Subject: init_reap_node() initialization fix
   6
   7 It looks like there is a bug in init_reap_node() in slab.c that can cause
   8 multiple oops's on certain ES7000 configurations.  The variable reap_node
   9 is defined per cpu, but only initialized on a single CPU.  This causes an
  10 oops in next_reap_node() when __get_cpu_var(reap_node) returns the wrong
  11 value.  Fix is below.
  12
  13 Signed-off-by: Dan Yeisley <dan.yeisley@unisys.com>
  14 Cc: Andi Kleen <ak@suse.de>
  15 Acked-by: Christoph Lameter <clameter@engr.sgi.com>
  16 Cc: Pekka Enberg <penberg@cs.helsinki.fi>
  17 Cc: Manfred Spraul <manfred@colorfullife.com>
  18 Cc: <stable@kernel.org>
  19 Signed-off-by: Andrew Morton <akpm@osdl.org>
  20 Signed-off-by: Linus Torvalds <torvalds@osdl.org>
  21 Signed-off-by: Chris Wright <chrisw@sous-sol.org>
  22 ---
  23  mm/slab.c |    2 +-
  24  1 file changed, 1 insertion(+), 1 deletion(-)
  25
  26 --- linux-2.6.18.2.orig/mm/slab.c
  27 +++ linux-2.6.18.2/mm/slab.c
  28 @@ -867,7 +867,7 @@ static void init_reap_node(int cpu)
  29         if (node == MAX_NUMNODES)
  30                 node = first_node(node_online_map);
  31
  32 -       __get_cpu_var(reap_node) = node;
  33 +       per_cpu(reap_node, cpu) = node;
  34  }
  35
  36  static void next_reap_node(void)