tag	line	file	source code
TTY_BREAK	811	drivers/char/keyboard.c	put_queue(TTY_BREAK);
TTY_BREAK	351	drivers/char/serial.c	queue->buf[head++]= TTY_BREAK;
TTY_BREAK	761	drivers/char/tty_io.c	if (tty->char_error == TTY_BREAK) {