SPE_PMU_HW_FLAGS_CX
static_assert((PERF_EVENT_FLAG_ARCH & SPE_PMU_HW_FLAGS_CX) == SPE_PMU_HW_FLAGS_CX);
event->hw.flags |= SPE_PMU_HW_FLAGS_CX;
return !!(event->hw.flags & SPE_PMU_HW_FLAGS_CX);