ATC_IS_CYCLIC
was_cyclic = test_and_set_bit(ATC_IS_CYCLIC, &atchan->status);
clear_bit(ATC_IS_CYCLIC, &atchan->status);
clear_bit(ATC_IS_CYCLIC, &atchan->status);
return test_bit(ATC_IS_CYCLIC, &atchan->status);