tty_debug
# define tty_debug_hangup(tty, f, args...) tty_debug(tty, f, ##args)
# define tty_debug_hangup(tty, f, args...) tty_debug(tty, f, ##args)
tty_debug(tty, "bad idx %d\n", idx);
tty_debug(tty, "bad driver table[%d] = %p\n",
tty_debug(tty, "bad other table[%d] = %p\n",
tty_debug(tty, "bad link = %p\n", o_tty->link);
tty_debug(tty, "current tty %s not NULL!!\n",
#define tty_ldisc_debug(tty, f, args...) tty_debug(tty, f, ##args)