94 	size_t canon_head;  member
232 		n = ldata->canon_head - ldata->read_tail;  in chars_in_buffer()
260 	if (ldata->icanon && ldata->canon_head == ldata->read_tail)  in n_tty_check_throttle()
336 	ldata->read_head = ldata->canon_head = ldata->read_tail = 0;  in reset_buffer_flags()
987 	if (ldata->read_head == ldata->canon_head) {  in eraser()
997 			ldata->read_head = ldata->canon_head;  in eraser()
1001 			ldata->read_head = ldata->canon_head;  in eraser()
1013 	while (MASK(ldata->read_head) != MASK(ldata->canon_head)) {  in eraser()
1021 			 MASK(head) != MASK(ldata->canon_head));  in eraser()
1063 				while (MASK(tail) != MASK(ldata->canon_head)) {  in eraser()
1093 	if (ldata->read_head == ldata->canon_head && L_ECHO(tty))  in eraser()
1333 			size_t tail = ldata->canon_head;  in n_tty_receive_char_special()
1363 				if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1378 			smp_store_release(&ldata->canon_head, ldata->read_head);  in n_tty_receive_char_special()
1391 			if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1418 		if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_inline()
1446 		if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_fast()
1728 			overflow = ldata->icanon && ldata->canon_head == tail;  in n_tty_receive_buf_common()
1802 			ldata->canon_head = ldata->read_tail;  in n_tty_set_termios()
1807 			ldata->canon_head = ldata->read_head;  in n_tty_set_termios()
1937 		return ldata->canon_head != ldata->read_tail;  in input_available_p()
2032 	n = min(*nr + 1, smp_load_acquire(&ldata->canon_head) - ldata->read_tail);  in canon_copy_from_read_buf()
2433 	if (ldata->canon_head == ldata->read_tail)  in inq_canon()
2435 	head = ldata->canon_head;  in inq_canon()