quicklists: Only consider memory that can be used with GFP_KERNEL

Quicklists calculates the size of the quicklists based on the number
of free pages. This must be the number of free pages that can be
allocated with GFP_KERNEL. node_page_state() includes the pages in
ZONE_HIGHMEM and ZONE_MOVABLE which may lead the quicklists to
become too large causing OOM.

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

Index: linux-2.6/mm/quicklist.c
===================================================================
--- linux-2.6.orig/mm/quicklist.c	2008-01-07 10:38:13.000000000 -0800
+++ linux-2.6/mm/quicklist.c	2008-01-07 10:38:44.000000000 -0800
@@ -26,9 +26,17 @@ DEFINE_PER_CPU(struct quicklist, quickli
 static unsigned long max_pages(unsigned long min_pages)
 {
 	unsigned long node_free_pages, max;
+	struct zone *zones = NODE_DATA(numa_node_id())->node_zones;
+
+	node_free_pages =
+#ifdef CONFIG_ZONE_DMA
+		zone_page_state(&zones[ZONE_DMA], NR_FREE_PAGES) +
+#endif
+#ifdef CONFIG_ZONE_DMA32
+		zone_page_state(&zones[ZONE_DMA32], NR_FREE_PAGES) +
+#endif
+		zone_page_state(&zones[ZONE_NORMAL], NR_FREE_PAGES);
 
-	node_free_pages = node_page_state(numa_node_id(),
-			NR_FREE_PAGES);
 	max = node_free_pages / FRACTION_OF_NODE_MEM;
 	return max(max, min_pages);
 }