PMU_FL_DYN_CONSTRAINT
if (x86_pmu.flags & (PMU_FL_EXCL_CNTRS | PMU_FL_TFA | PMU_FL_DYN_CONSTRAINT)) {
x86_pmu.flags |= PMU_FL_DYN_CONSTRAINT;
x86_pmu.flags |= PMU_FL_BR_CNTR | PMU_FL_DYN_CONSTRAINT;