diff -pNaru5 a/rocketrp2.c b/rocketrp2.c
--- a/rocketrp2.c	2023-01-29 04:27:55.446530197 -0500
+++ b/rocketrp2.c	2023-01-29 04:30:00.396345092 -0500
@@ -652,10 +652,13 @@ static void __rp2_uart_set_termios(struc
 #endif
 }
 
 static void rp2_uart_set_termios(struct uart_port *port,
                                  struct ktermios *new,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6,0,0)
+                                 const
+#endif
                                  struct ktermios *old)
 {
   struct rp2_uart_port *up = port_to_up(port);
   unsigned long flags;
   unsigned int baud, baud_div;