perf_cpu_map__merge
perf_cpu_map__merge(&evlist->all_cpus, evsel->cpus);
LIBPERF_API int perf_cpu_map__merge(struct perf_cpu_map **orig,
perf_cpu_map__merge(&a, b);
perf_cpu_map__merge(&two, one);
perf_cpu_map__merge(&used_cpus, pos->core.cpus);
ret = perf_cpu_map__merge(&cpu_map, pmu->cpus);
perf_cpu_map__merge(&cpus, term_cpus);