6238 				 struct perf_event *output_event);
6283 		struct perf_event *output_event = NULL;  in _perf_ioctl()  local
6287 			output_event = fd_file(output)->private_data;  in _perf_ioctl()
6289 		return perf_event_set_output(event, output_event);  in _perf_ioctl()
12900 perf_event_set_output(struct perf_event *event, struct perf_event *output_event)  in perf_event_set_output()  argument
12905 	if (!output_event) {  in perf_event_set_output()
12911 	if (event == output_event)  in perf_event_set_output()
12917 	if (output_event->cpu != event->cpu)  in perf_event_set_output()
12923 	if (output_event->cpu == -1 && output_event->hw.target != event->hw.target)  in perf_event_set_output()
12929 	if (output_event->clock != event->clock)  in perf_event_set_output()
12936 	if (is_write_backward(output_event) != is_write_backward(event))  in perf_event_set_output()
12942 	if (has_aux(event) && has_aux(output_event) &&  in perf_event_set_output()
12943 	    event->pmu != output_event->pmu)  in perf_event_set_output()
12953 	mutex_lock_double(&event->mmap_mutex, &output_event->mmap_mutex);  in perf_event_set_output()
12959 	if (output_event) {  in perf_event_set_output()
12961 		rb = ring_buffer_get(output_event);  in perf_event_set_output()
12977 	if (output_event)  in perf_event_set_output()
12978 		mutex_unlock(&output_event->mmap_mutex);  in perf_event_set_output()
13065 	struct perf_event *group_leader = NULL, *output_event = NULL;  in SYSCALL_DEFINE5()  local
13149 			output_event = group_leader;  in SYSCALL_DEFINE5()
13323 	if (output_event) {  in SYSCALL_DEFINE5()
13324 		err = perf_event_set_output(event, output_event);  in SYSCALL_DEFINE5()