diff -Nupr src.orig/drivers/tty/tty_buffer.c src/drivers/tty/tty_buffer.c
--- src.orig/drivers/tty/tty_buffer.c	2016-12-15 19:55:54.840000000 +0000
+++ src/drivers/tty/tty_buffer.c	2016-12-15 19:58:05.088000000 +0000
@@ -255,6 +255,8 @@ static int __tty_buffer_request_room(str
 	struct tty_buffer *b, *n;
 	int left, change;
 
+	if (!size)
+		printk("kpatch-test: testing .smp_locks section changes\n");
 	b = buf->tail;
 	if (b->flags & TTYB_NORMAL)
 		left = 2 * b->size - b->used;