2 files changed, 10 insertions, 1 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index d71ff763c9df..da8eb8ad9e9b 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -24,6 +24,14 @@
 #endif
 #define MAX_ORDER_NR_PAGES (1 << (MAX_ORDER - 1))
 
+/*
+ * PAGE_ALLOC_COSTLY_ORDER is the order at which allocations are deemed
+ * costly to service.  That is between allocation orders which should
+ * coelesce naturally under reasonable reclaim pressure and those which
+ * will not.
+ */
+#define PAGE_ALLOC_COSTLY_ORDER 3
+
 struct free_area {
         struct list_head        free_list;
         unsigned long           nr_free;
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 006868881346..665f85f2a3af 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -188,7 +188,8 @@ extern int rotate_reclaimable_page(struct page *page);
 extern void swap_setup(void);
 
 /* linux/mm/vmscan.c */
-extern unsigned long try_to_free_pages(struct zone **, gfp_t);
+extern unsigned long try_to_free_pages(struct zone **zones, int order,
+                                        gfp_t gfp_mask);
 extern unsigned long shrink_all_memory(unsigned long nr_pages);
 extern int vm_swappiness;
 extern int remove_mapping(struct address_space *mapping, struct page *page);