Subject: slub: Add check for kfree() of non slab objects.

We can detect kfree()s on non slab objects by checking for PageCompound().

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c	2008-05-27 21:28:55.000000000 -0700
+++ linux-2.6/mm/slub.c	2008-05-28 00:04:14.000000000 -0700
@@ -2765,6 +2765,7 @@
 
 	page = virt_to_head_page(x);
 	if (unlikely(!PageSlab(page))) {
+		BUG_ON(!PageCompound(page));
 		put_page(page);
 		return;
 	}