diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 5dcaa3c..dd8916f 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -476,7 +476,8 @@
 				 * the bdi from the thread. Hopefully 1024 is
 				 * large enough for efficient IO.
 				 */
-				writeback_inodes_wb(&bdi->wb, 1024);
+				writeback_inodes_wb(&bdi->wb, 1024,
+						    WB_REASON_FORKER_THREAD);
 			} else {
 				/*
 				 * The spinlock makes sure we do not lose