Index: linux-2.6.21-rc1/mm/slub.c
===================================================================
--- linux-2.6.21-rc1.orig/mm/slub.c	2007-02-24 10:44:04.000000000 -0800
+++ linux-2.6.21-rc1/mm/slub.c	2007-02-24 10:51:52.000000000 -0800
@@ -1149,7 +1149,10 @@ static struct kmem_cache *get_slab(size_
 {
 	int index = kmalloc_index(size) - KMALLOC_SHIFT_LOW;
 
-	BUG_ON(size <= 0 || index < 0);
+	/* Old Slab allows allocations with zero size. So warn on those */
+	WARN_ON(size == 0);
+	/* Allocation too large ? */
+	BUG_ON(index < 0);
 
 #ifdef CONFIG_ZONE_DMA
 	if ((flags & SLUB_DMA)) {