--- zzzz-none-000/linux-2.6.32.61/mm/page_isolation.c	2013-06-10 09:43:48.000000000 +0000
+++ ar9-7330-650/linux-2.6.32.61/mm/page_isolation.c	2015-04-09 11:31:23.000000000 +0000
@@ -119,7 +119,6 @@
 	struct zone *zone;
 	int ret;
 
-	pfn = start_pfn;
 	/*
 	 * Note: pageblock_nr_page != MAX_ORDER. Then, chunks of free page
 	 * is not aligned to pageblock_nr_pages.