--- zzzz-none-000/linux-2.6.32.61/block/blk-core.c	2013-06-10 09:43:48.000000000 +0000
+++ virian-300e-630/linux-2.6.32.61/block/blk-core.c	2013-10-15 11:47:24.000000000 +0000
@@ -1716,7 +1716,7 @@
 	if (blk_do_io_stat(req)) {
 		const int rw = rq_data_dir(req);
 		struct hd_struct *part;
-		int cpu;
+		int cpu __maybe_unused__;
 
 		cpu = part_stat_lock();
 		part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));