upstat_t 197 include/linux/serial_core.h upstat_t status; upstat_t 199 include/linux/serial_core.h #define UPSTAT_CTS_ENABLE ((__force upstat_t) (1 << 0)) upstat_t 200 include/linux/serial_core.h #define UPSTAT_DCD_ENABLE ((__force upstat_t) (1 << 1))