From: Pekka Enberg <penberg@cs.helsinki.fi>
Date: Mon, 14 Apr 2008 15:50:44 +0000 (+0300)
Subject: slub: Initialize per-cpu stats
X-Git-Tag: v2.6.26-rc1~1159^2~5
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=62f75532b583c03840f31e40386ce2df73be9ca0;p=linux-2.6-omap-h63xx.git

slub: Initialize per-cpu stats

As spotted by kmemcheck, we need to initialize the per-CPU ->stat array before
using it.

[kmem_cache_cpu structures are usually allocated from arrays defined via
DEFINE_PER_CPU that are zeroed so we have not noticed this so far --cl].

Reported-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
---

diff --git a/mm/slub.c b/mm/slub.c
index acc975fcc8c..15a7a0d45d7 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1886,6 +1886,9 @@ static void init_kmem_cache_cpu(struct kmem_cache *s,
 	c->node = 0;
 	c->offset = s->offset / sizeof(void *);
 	c->objsize = s->objsize;
+#ifdef CONFIG_SLUB_STATS
+	memset(c->stat, 0, NR_SLUB_STAT_ITEMS * sizeof(unsigned));
+#endif
 }
 
 static void init_kmem_cache_node(struct kmem_cache_node *n)