kernel/events/core.c

4456 static int __perf_event_read_cpu(struct perf_event *event, int event_cpu)
4460 	if ((unsigned)event_cpu >= nr_cpu_ids)
4461 		return event_cpu;
4466 		event_pkg = topology_physical_package_id(event_cpu);
4473 	return event_cpu;
4566 	int event_cpu;
4596 	event_cpu = __perf_event_read_cpu(event, event->cpu);
4600 	    event_cpu != smp_processor_id()) {
4638 	int event_cpu, ret = 0;
4656 		event_cpu = READ_ONCE(event->oncpu);
4657 		if ((unsigned)event_cpu >= nr_cpu_ids)
4667 		event_cpu = __perf_event_read_cpu(event, event_cpu);
4673 		 * If event_cpu isn't a valid CPU it means the event got
4679 		(void)smp_call_function_single(event_cpu, __perf_event_read, &data, 1);