From: Christoph Lameter <clameter@sgi.com>
Subject: SLAB: Fallback if local node has no ZONE_NORMAL memory

Fallback to another node if the local node does not have ZONE_NORMAL
memory. This is necessary if a node only has highmem.

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

---
 mm/slab.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux-2.6/mm/slab.c
===================================================================
--- linux-2.6.orig/mm/slab.c	2008-01-07 21:37:34.000000000 -0800
+++ linux-2.6/mm/slab.c	2008-01-07 21:38:09.000000000 -0800
@@ -2977,7 +2977,10 @@ retry:
 	}
 	l3 = cachep->nodelists[node];
 
-	BUG_ON(ac->avail > 0 || !l3);
+	if (!l3)
+		return NULL;
+
+	BUG_ON(ac->avail > 0);
 	spin_lock(&l3->list_lock);
 
 	/* See if we can refill from the shared array */