diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 23af355..0435c85 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -155,7 +155,7 @@
 				      void __user *, size_t *, loff_t *);
 
 void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty);
-unsigned long wb_dirty_limit(struct bdi_writeback *wb, unsigned long dirty);
+unsigned long wb_calc_thresh(struct bdi_writeback *wb, unsigned long thresh);
 
 void __wb_update_bandwidth(struct bdi_writeback *wb,
 			   unsigned long thresh,