perf_pmu_nop_void 10138 kernel/events/core.c pmu->cancel_txn = perf_pmu_nop_void; perf_pmu_nop_void 10143 kernel/events/core.c pmu->pmu_enable = perf_pmu_nop_void; perf_pmu_nop_void 10144 kernel/events/core.c pmu->pmu_disable = perf_pmu_nop_void;