tag	line	file	source code
UART_IER_THRI	277	drivers/char/serial.c	UART_IER_THRI | UART_IER_RDI);
UART_IER_THRI	790	drivers/char/serial.c	UART_IER_THRI | UART_IER_RDI);
UART_IER_THRI	1038	drivers/char/serial.c	UART_IER_THRI | UART_IER_RDI);