642 	size_t tail;  in __process_echoes()  local
647 	tail = ldata->echo_tail;  in __process_echoes()
648 	while (ldata->echo_commit != tail) {  in __process_echoes()
649 		c = echo_buf(ldata, tail);  in __process_echoes()
659 			op = echo_buf(ldata, tail + 1);  in __process_echoes()
665 				num_chars = echo_buf(ldata, tail + 2);  in __process_echoes()
691 				tail += 3;  in __process_echoes()
696 				tail += 2;  in __process_echoes()
702 				tail += 2;  in __process_echoes()
714 				tail += 2;  in __process_echoes()
735 				tail += 2;  in __process_echoes()
752 			tail += 1;  in __process_echoes()
759 	while (ldata->echo_commit - tail >= ECHO_DISCARD_WATERMARK) {  in __process_echoes()
760 		if (echo_buf(ldata, tail) == ECHO_OP_START) {  in __process_echoes()
761 			if (echo_buf(ldata, tail + 1) == ECHO_OP_ERASE_TAB)  in __process_echoes()
762 				tail += 3;  in __process_echoes()
764 				tail += 2;  in __process_echoes()
766 			tail++;  in __process_echoes()
769 	ldata->echo_tail = tail;  in __process_echoes()
1049 				size_t tail = ldata->read_head;  in eraser()  local
1058 				while (tail != ldata->canon_head) {  in eraser()
1059 					tail--;  in eraser()
1060 					c = read_buf(ldata, tail);  in eraser()
1335 			size_t tail = ldata->canon_head;  in n_tty_receive_char_special()  local
1340 			while (tail != ldata->read_head) {  in n_tty_receive_char_special()
1341 				echo_char(read_buf(ldata, tail), tty);  in n_tty_receive_char_special()
1342 				tail++;  in n_tty_receive_char_special()
1728 		size_t tail = smp_load_acquire(&ldata->read_tail);  in n_tty_receive_buf_common()  local
1730 		room = N_TTY_BUF_SIZE - (ldata->read_head - tail);  in n_tty_receive_buf_common()
1735 			overflow = ldata->icanon && ldata->canon_head == tail;  in n_tty_receive_buf_common()
1995 	size_t tail = ldata->read_tail & (N_TTY_BUF_SIZE - 1);  in copy_from_read_buf()  local
1998 	n = min(head - ldata->read_tail, N_TTY_BUF_SIZE - tail);  in copy_from_read_buf()
2001 		retval = copy_to_user(*b, read_buf_addr(ldata, tail), n);  in copy_from_read_buf()
2003 		is_eof = n == 1 && read_buf(ldata, tail) == EOF_CHAR(tty);  in copy_from_read_buf()
2004 		tty_audit_add_data(tty, read_buf_addr(ldata, tail), n,  in copy_from_read_buf()
2047 	size_t tail;  in canon_copy_from_read_buf()  local
2056 	tail = ldata->read_tail & (N_TTY_BUF_SIZE - 1);  in canon_copy_from_read_buf()
2057 	size = min_t(size_t, tail + n, N_TTY_BUF_SIZE);  in canon_copy_from_read_buf()
2060 		    __func__, *nr, tail, n, size);  in canon_copy_from_read_buf()
2062 	eol = find_next_bit(ldata->read_flags, size, tail);  in canon_copy_from_read_buf()
2063 	more = n - (size - tail);  in canon_copy_from_read_buf()
2072 	size = N_TTY_BUF_SIZE - tail;  in canon_copy_from_read_buf()
2073 	n = eol - tail;  in canon_copy_from_read_buf()
2088 		ret = tty_copy_to_user(tty, *b, read_buf_addr(ldata, tail), size);  in canon_copy_from_read_buf()
2093 		ret = tty_copy_to_user(tty, *b, read_buf_addr(ldata, tail), n);  in canon_copy_from_read_buf()
2188 	size_t tail;  in n_tty_read()  local
2225 	tail = ldata->read_tail;  in n_tty_read()
2317 	if (tail != ldata->read_tail)  in n_tty_read()
2492 	size_t nr, head, tail;  in inq_canon()  local
2497 	tail = ldata->read_tail;  in inq_canon()
2498 	nr = head - tail;  in inq_canon()
2500 	while (head != tail) {  in inq_canon()
2501 		if (test_bit(tail & (N_TTY_BUF_SIZE - 1), ldata->read_flags) &&  in inq_canon()
2502 		    read_buf(ldata, tail) == __DISABLED_CHAR)  in inq_canon()
2504 		tail++;  in inq_canon()