diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 859e797..0ee33c2 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -101,7 +101,7 @@
 		const char *fmt, ...);
 int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev);
 void bdi_unregister(struct backing_dev_info *bdi);
-void bdi_start_writeback(struct writeback_control *wbc);
+void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages);
 int bdi_writeback_task(struct bdi_writeback *wb);
 int bdi_has_dirty_io(struct backing_dev_info *bdi);