PERF_MSR_EVENT_MAX 200 arch/x86/events/msr.c if (cfg >= PERF_MSR_EVENT_MAX) PERF_MSR_EVENT_MAX 203 arch/x86/events/msr.c cfg = array_index_nospec((unsigned long)cfg, PERF_MSR_EVENT_MAX); PERF_MSR_EVENT_MAX 298 arch/x86/events/msr.c msr_mask = perf_msr_probe(msr, PERF_MSR_EVENT_MAX, true, NULL);