diff --git a/fs/char_dev.c b/fs/char_dev.c
index bbbf07b..c3bfa76 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -545,6 +545,7 @@
 void __init chrdev_init(void)
 {
 	cdev_map = kobj_map_init(base_probe, &chrdevs_lock);
+	bdi_init(&directly_mappable_cdev_bdi);
 }