From: Gu Zheng <guz.fnst@cn.fujitsu.com>
Date: Wed, 6 Aug 2014 23:04:51 +0000 (-0700)
Subject: slab: fix the alias count (via sysfs) of slab cache
X-Git-Tag: v4.14-rc1~7080^2~184
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4307c14f3c77bc0cb0facfc9c67c7872505aaedf;p=platform%2Fkernel%2Flinux-rpi.git

slab: fix the alias count (via sysfs) of slab cache

We mark some slab caches (e.g.  kmem_cache_node) as unmergeable by
setting refcount to -1, and their alias should be 0, not refcount-1, so
correct it here.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/slub.c b/mm/slub.c
index d9aadbf..9b861b9 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4466,7 +4466,7 @@ SLAB_ATTR_RO(ctor);
 
 static ssize_t aliases_show(struct kmem_cache *s, char *buf)
 {
-	return sprintf(buf, "%d\n", s->refcount - 1);
+	return sprintf(buf, "%d\n", s->refcount < 0 ? 0 : s->refcount - 1);
 }
 SLAB_ATTR_RO(aliases);