AFS_SERVER_FL_UPDATING
if (test_bit(AFS_SERVER_FL_UPDATING, &server->flags))
if (!test_and_set_bit_lock(AFS_SERVER_FL_UPDATING, &server->flags)) {
clear_bit_unlock(AFS_SERVER_FL_UPDATING, &server->flags);
wake_up_bit(&server->flags, AFS_SERVER_FL_UPDATING);
ret = wait_on_bit(&server->flags, AFS_SERVER_FL_UPDATING,