Support compat_ioctl get/set termios_locked

index 428f4fe..8d1073f 100644
@@ -40,6 +40,7 @@
 #include <linux/tty.h>
 #include <linux/timer.h>
 #include <linux/ctype.h>
+#include <linux/compat.h>
 #include <linux/mm.h>
 #include <linux/string.h>
 #include <linux/slab.h>

@@ -2088,6 +2089,20 @@ static int n_tty_ioctl(struct tty_struct *tty, struct file *file,
 	}
 }
 
+#ifdef CONFIG_COMPAT
+static long n_tty_compat_ioctl(struct tty_struct *tty, struct file *file,
+		              unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case TIOCGLCKTRMIOS:
+	case TIOCSLCKTRMIOS:
+		return tty_mode_ioctl(tty, file, cmd, (unsigned long) compat_ptr(arg));
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+#endif
+
 struct tty_ldisc_ops tty_ldisc_N_TTY = {
 	.magic           = TTY_LDISC_MAGIC,
 	.name            = "n_tty",

@@ -2098,6 +2113,9 @@ struct tty_ldisc_ops tty_ldisc_N_TTY = {
 	.read            = n_tty_read,
 	.write           = n_tty_write,
 	.ioctl           = n_tty_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl    = n_tty_compat_ioctl,
+#endif
 	.set_termios     = n_tty_set_termios,
 	.poll            = n_tty_poll,
 	.receive_buf     = n_tty_receive_buf,