diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 573d138..7b5920a 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -299,17 +299,13 @@
 
 	return nr_pages;
 }
-#ifdef CONFIG_HIGHMEM
-atomic_t highmem_file_pages;
-#endif
 
 static unsigned long highmem_dirtyable_memory(unsigned long total)
 {
 #ifdef CONFIG_HIGHMEM
 	int node;
-	unsigned long x;
+	unsigned long x = 0;
 	int i;
-	unsigned long dirtyable = 0;
 
 	for_each_node_state(node, N_HIGH_MEMORY) {
 		for (i = ZONE_NORMAL + 1; i < MAX_NR_ZONES; i++) {
@@ -326,12 +322,12 @@
 			nr_pages = zone_page_state(z, NR_FREE_PAGES);
 			/* watch for underflows */
 			nr_pages -= min(nr_pages, high_wmark_pages(z));
-			dirtyable += nr_pages;
+			nr_pages += zone_page_state(z, NR_ZONE_INACTIVE_FILE);
+			nr_pages += zone_page_state(z, NR_ZONE_ACTIVE_FILE);
+			x += nr_pages;
 		}
 	}
 
-	x = dirtyable + atomic_read(&highmem_file_pages);
-
 	/*
 	 * Unreclaimable memory (kernel memory or anonymous memory
 	 * without swap) can bring down the dirtyable pages below