static void sn_sal_console_write(struct console *, const char *, unsigned);
 static int __init sn_sal_console_setup(struct console *, char *);
-extern struct uart_driver sal_console_uart;
+static struct uart_driver sal_console_uart;
 extern struct tty_driver *uart_console_device(struct console *, int *);
 
 static struct console sal_console = {
 
 #define SAL_CONSOLE    &sal_console
 
-struct uart_driver sal_console_uart = {
+static struct uart_driver sal_console_uart = {
        .owner = THIS_MODULE,
        .driver_name = "sn_console",
        .dev_name = DEVICE_NAME,