diff -Nupr src.orig/drivers/tty/n_tty.c src/drivers/tty/n_tty.c

--- src.orig/drivers/tty/n_tty.c	2016-12-15 19:55:54.840000000 +0000

+++ src/drivers/tty/n_tty.c	2016-12-15 19:57:43.856000000 +0000

@@ -2328,7 +2328,7 @@ static ssize_t n_tty_read(struct tty_str

  *		  lock themselves)

  */

-static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,

+static ssize_t noinline kpatch_n_tty_write(struct tty_struct *tty, struct file *file,

 			   const unsigned char *buf, size_t nr)

 {

 	const unsigned char *b = buf;

@@ -2415,6 +2415,12 @@ break_out:

 	return (b - buf) ? b - buf : retval;

 }

+static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,

+			   const unsigned char *buf, size_t nr)

+{

+	return kpatch_n_tty_write(tty, file, buf, nr);

+}

+

 /**

  *	n_tty_poll		-	poll method for N_TTY

  *	@tty: terminal device