uart_circ_clear   192 drivers/tty/serial/8250/8250_mtk.c 		uart_circ_clear(&port->state->xmit);
uart_circ_clear   208 drivers/tty/serial/serial_core.c 		uart_circ_clear(&state->xmit);
uart_circ_clear   663 drivers/tty/serial/serial_core.c 	uart_circ_clear(&state->xmit);