UPF_USR_MASK 858 drivers/tty/serial/serial_core.c (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) UPF_USR_MASK 860 drivers/tty/serial/serial_core.c uport->flags = ((uport->flags & ~UPF_USR_MASK) | UPF_USR_MASK 861 drivers/tty/serial/serial_core.c (new_flags & UPF_USR_MASK));