2 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 2e93eb831c61..7c124541f011 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -71,8 +71,7 @@ struct tty_bufhead {
 	struct tty_buffer *head;	/* Queue head */
 	struct tty_buffer *tail;	/* Active buffer */
 	struct llist_head free;		/* Free queue head */
-	int memory_used;		/* Buffer space used excluding
-								free queue */
+	atomic_t	   memory_used; /* In-use buffers excluding free list */
 };
 /*
  * When a break, frame error, or parity error happens, these codes are
diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h
index ad0303994c32..6944ed2ce692 100644
--- a/include/linux/tty_flip.h
+++ b/include/linux/tty_flip.h
@@ -1,6 +1,7 @@
 #ifndef _LINUX_TTY_FLIP_H
 #define _LINUX_TTY_FLIP_H
 
+extern int tty_buffer_space_avail(struct tty_port *port);
 extern int tty_buffer_request_room(struct tty_port *port, size_t size);
 extern int tty_insert_flip_string_flags(struct tty_port *port,
 		const unsigned char *chars, const char *flags, size_t size);