From: Andrew Morton <akpm@linux-foundation.org>

Well?  Should it?

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page_alloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/page_alloc.c~alloc_pages-debug mm/page_alloc.c
--- a/mm/page_alloc.c~alloc_pages-debug
+++ a/mm/page_alloc.c
@@ -1559,7 +1559,7 @@ restart:
 	z = zonelist->zones;  /* the list of zones suitable for gfp_mask */
 
 	if (unlikely(*z == NULL)) {
-		/* Should this ever happen?? */
+		WARN_ON_ONCE(1);
 		return NULL;
 	}
 
_