diff --git a/mm/slab.c b/mm/slab.c
index d2cd304..1a88fde 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2746,7 +2746,7 @@
 	 * Be lazy and only check for valid flags here,  keeping it out of the
 	 * critical path in kmem_cache_alloc().
 	 */
-	BUG_ON(flags & ~(GFP_DMA | GFP_LEVEL_MASK));
+	BUG_ON(flags & ~(GFP_DMA | __GFP_ZERO | GFP_LEVEL_MASK));
 
 	local_flags = (flags & GFP_LEVEL_MASK);
 	/* Take the l3 list lock to change the colour_next on this node */
@@ -3392,6 +3392,9 @@
 	local_irq_restore(save_flags);
 	ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, caller);
 
+	if (unlikely((flags & __GFP_ZERO) && ptr))
+		memset(ptr, 0, obj_size(cachep));
+
 	return ptr;
 }
 
@@ -3443,6 +3446,9 @@
 	objp = cache_alloc_debugcheck_after(cachep, flags, objp, caller);
 	prefetchw(objp);
 
+	if (unlikely((flags & __GFP_ZERO) && objp))
+		memset(objp, 0, obj_size(cachep));
+
 	return objp;
 }