1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index d1321a81c9c4..52be879793ed 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -97,6 +97,10 @@ extern int dirty_expire_interval;
 extern int block_dump;
 extern int laptop_mode;
 
+extern int dirty_ratio_handler(struct ctl_table *table, int write,
+                struct file *filp, void __user *buffer, size_t *lenp,
+                loff_t *ppos);
+
 struct ctl_table;
 struct file;
 int dirty_writeback_centisecs_handler(struct ctl_table *, int, struct file *,