[PATCH] slab: fix crash on __drain_alien_cahce() during CPU Hotplug

[karo-tx-linux.git] / mm / slab.c

diff --git a/mm/slab.c b/mm/slab.c
index af5c5237e11a0df9d2f384383a2e8cd3b846a792..c32af7e7581ef0ff11ef112f94b6a84da50cafc4 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -979,7 +979,8 @@ static void __drain_alien_cache(struct kmem_cache *cachep,
                 * That way we could avoid the overhead of putting the objects
                 * into the free lists and getting them back later.
                 */
-               transfer_objects(rl3->shared, ac, ac->limit);
+               if (rl3->shared)
+                       transfer_objects(rl3->shared, ac, ac->limit);
 
                free_block(cachep, ac->entry, ac->avail, node);
                ac->avail = 0;