Merge 3.0.52

Merge branch 'linux-3.0.y' of git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable into jellybean-next

Conflicts:
	drivers/net/tun.c
	kernel/time/timekeeping.c

Change-Id: Iba7fc59ca05114d9e7bade8dfc5bb45229ebf075

1 files changed, 25 insertions, 15 deletions

diff --git a/mm/slub.c b/mm/slub.c
index 10ab233..ae6e80e 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1457,6 +1457,7 @@ static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
 	struct zone *zone;
 	enum zone_type high_zoneidx = gfp_zone(flags);
 	struct page *page;
+	unsigned int cpuset_mems_cookie;
 
 	/*
 	 * The defrag ratio allows a configuration of the tradeoffs between
@@ -1480,23 +1481,32 @@ static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
 			get_cycles() % 1024 > s->remote_node_defrag_ratio)
 		return NULL;
 
-	get_mems_allowed();
-	zonelist = node_zonelist(slab_node(current->mempolicy), flags);
-	for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
-		struct kmem_cache_node *n;
-
-		n = get_node(s, zone_to_nid(zone));
-
-		if (n && cpuset_zone_allowed_hardwall(zone, flags) &&
-				n->nr_partial > s->min_partial) {
-			page = get_partial_node(n);
-			if (page) {
-				put_mems_allowed();
-				return page;
+	do {
+		cpuset_mems_cookie = get_mems_allowed();
+		zonelist = node_zonelist(slab_node(current->mempolicy), flags);
+		for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
+			struct kmem_cache_node *n;
+
+			n = get_node(s, zone_to_nid(zone));
+
+			if (n && cpuset_zone_allowed_hardwall(zone, flags) &&
+					n->nr_partial > s->min_partial) {
+				page = get_partial_node(n);
+				if (page) {
+					/*
+					 * Return the object even if
+					 * put_mems_allowed indicated that
+					 * the cpuset mems_allowed was
+					 * updated in parallel. It's a
+					 * harmless race between the alloc
+					 * and the cpuset update.
+					 */
+					put_mems_allowed(cpuset_mems_cookie);
+					return page;
+				}
 			}
 		}
-	}
-	put_mems_allowed();
+	} while (!put_mems_allowed(cpuset_mems_cookie));
 #endif
 	return NULL;
 }