156 			    size_t tail, size_t n)  in tty_copy_to_user()  argument
159 	size_t size = N_TTY_BUF_SIZE - tail;  in tty_copy_to_user()
160 	const void *from = read_buf_addr(ldata, tail);  in tty_copy_to_user()
615 	size_t tail;  in __process_echoes()  local
620 	tail = ldata->echo_tail;  in __process_echoes()
621 	while (MASK(ldata->echo_commit) != MASK(tail)) {  in __process_echoes()
622 		c = echo_buf(ldata, tail);  in __process_echoes()
632 			if (MASK(ldata->echo_commit) == MASK(tail + 1))  in __process_echoes()
639 			op = echo_buf(ldata, tail + 1);  in __process_echoes()
645 				if (MASK(ldata->echo_commit) == MASK(tail + 2))  in __process_echoes()
647 				num_chars = echo_buf(ldata, tail + 2);  in __process_echoes()
673 				tail += 3;  in __process_echoes()
678 				tail += 2;  in __process_echoes()
684 				tail += 2;  in __process_echoes()
696 				tail += 2;  in __process_echoes()
717 				tail += 2;  in __process_echoes()
734 			tail += 1;  in __process_echoes()
741 	while (ldata->echo_commit > tail &&  in __process_echoes()
742 	       ldata->echo_commit - tail >= ECHO_DISCARD_WATERMARK) {  in __process_echoes()
743 		if (echo_buf(ldata, tail) == ECHO_OP_START) {  in __process_echoes()
744 			if (echo_buf(ldata, tail + 1) == ECHO_OP_ERASE_TAB)  in __process_echoes()
745 				tail += 3;  in __process_echoes()
747 				tail += 2;  in __process_echoes()
749 			tail++;  in __process_echoes()
753 	ldata->echo_tail = tail;  in __process_echoes()
1039 				size_t tail = ldata->read_head;  in eraser()  local
1048 				while (MASK(tail) != MASK(ldata->canon_head)) {  in eraser()
1049 					tail--;  in eraser()
1050 					c = read_buf(ldata, tail);  in eraser()
1318 			size_t tail = ldata->canon_head;  in n_tty_receive_char_special()  local
1323 			while (MASK(tail) != MASK(ldata->read_head)) {  in n_tty_receive_char_special()
1324 				echo_char(read_buf(ldata, tail), tty);  in n_tty_receive_char_special()
1325 				tail++;  in n_tty_receive_char_special()
1706 		size_t tail = smp_load_acquire(&ldata->read_tail);  in n_tty_receive_buf_common()  local
1708 		room = N_TTY_BUF_SIZE - (ldata->read_head - tail);  in n_tty_receive_buf_common()
1713 			overflow = ldata->icanon && ldata->canon_head == tail;  in n_tty_receive_buf_common()
1957 	size_t tail = ldata->read_tail & (N_TTY_BUF_SIZE - 1);  in copy_from_read_buf()  local
1960 	n = min(head - ldata->read_tail, N_TTY_BUF_SIZE - tail);  in copy_from_read_buf()
1963 		const unsigned char *from = read_buf_addr(ldata, tail);  in copy_from_read_buf()
2009 	size_t tail;  in canon_copy_from_read_buf()  local
2018 	tail = ldata->read_tail & (N_TTY_BUF_SIZE - 1);  in canon_copy_from_read_buf()
2019 	size = min_t(size_t, tail + n, N_TTY_BUF_SIZE);  in canon_copy_from_read_buf()
2022 		    __func__, *nr, tail, n, size);  in canon_copy_from_read_buf()
2024 	eol = find_next_bit(ldata->read_flags, size, tail);  in canon_copy_from_read_buf()
2025 	more = n - (size - tail);  in canon_copy_from_read_buf()
2033 	n = eol - tail;  in canon_copy_from_read_buf()
2044 		    __func__, eol, found, n, c, tail, more);  in canon_copy_from_read_buf()
2046 	ret = tty_copy_to_user(tty, *b, tail, n);  in canon_copy_from_read_buf()
2127 	size_t tail;  in n_tty_read()  local
2159 	tail = ldata->read_tail;  in n_tty_read()
2250 	if (tail != ldata->read_tail)  in n_tty_read()
2415 	size_t nr, head, tail;  in inq_canon()  local
2420 	tail = ldata->read_tail;  in inq_canon()
2421 	nr = head - tail;  in inq_canon()
2423 	while (MASK(head) != MASK(tail)) {  in inq_canon()
2424 		if (test_bit(tail & (N_TTY_BUF_SIZE - 1), ldata->read_flags) &&  in inq_canon()
2425 		    read_buf(ldata, tail) == __DISABLED_CHAR)  in inq_canon()
2427 		tail++;  in inq_canon()