[PATCH] NUMA: broken per cpu pageset counters

The NUMA counters in struct per_cpu_pageset (linux/mmzone.h) are never
cleared today.  This works ok for CPU 0 on NUMA machines because
boot_pageset[] is already zero, but for other CPU:s this results in
uninitialized counters.

Signed-off-by: Magnus Damm <magnus@valinux.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index cc1fe2672a31..e1d3d77f4aee 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1750,6 +1750,8 @@ inline void setup_pageset(struct per_cpu_pageset *p, unsigned long batch)
 {
         struct per_cpu_pages *pcp;
 
+        memset(p, 0, sizeof(*p));
+
         pcp = &p->pcp[0];               /* hot */
         pcp->count = 0;
         pcp->low = 2 * batch;