SIFIVE_SERIAL_RXDATA_EMPTY_SHIFT   71 drivers/tty/serial/sifive.c #define SIFIVE_SERIAL_RXDATA_EMPTY_MASK		(1 << SIFIVE_SERIAL_RXDATA_EMPTY_SHIFT)
SIFIVE_SERIAL_RXDATA_EMPTY_SHIFT  418 drivers/tty/serial/sifive.c 			SIFIVE_SERIAL_RXDATA_EMPTY_SHIFT;