GFP_VFALLBACK for zone wait table.

Currently vmalloc is used for the zone wait table possibly generating the need
to generate lots of TLBs to access the tables. We can now use GFP_VFALLBACK to
attempt the use of a physically contiguous page that can then use the large
kernel TLBs.

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

---
 mm/page_alloc.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c	2007-09-24 18:48:06.000000000 -0700
+++ linux-2.6/mm/page_alloc.c	2007-09-24 18:48:16.000000000 -0700
@@ -2550,7 +2550,9 @@ int zone_wait_table_init(struct zone *zo
 		 * To use this new node's memory, further consideration will be
 		 * necessary.
 		 */
-		zone->wait_table = (wait_queue_head_t *)vmalloc(alloc_size);
+		zone->wait_table = (wait_queue_head_t *)
+			__get_free_pages(GFP_VFALLBACK,
+					get_order(alloc_size));
 	}
 	if (!zone->wait_table)
 		return -ENOMEM;