489 				struct circ_buf *circ, unsigned char c)  in __uart_put_char()  argument
494 	if (!circ->buf)  in __uart_put_char()
498 	if (uart_circ_chars_free(circ) != 0) {  in __uart_put_char()
499 		circ->buf[circ->head] = c;  in __uart_put_char()
500 		circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1);  in __uart_put_char()
524 	struct circ_buf *circ;  in uart_write()  local
538 	circ = &state->xmit;  in uart_write()
540 	if (!circ->buf)  in uart_write()
545 		c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE);  in uart_write()
550 		memcpy(circ->buf + circ->head, buf, c);  in uart_write()
551 		circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1);  in uart_write()