2318 	struct perf_event *parent_event = event->parent;  in perf_child_detach()  local
2325 	if (WARN_ON_ONCE(!parent_event))  in perf_child_detach()
2328 	lockdep_assert_held(&parent_event->child_mutex);  in perf_child_detach()
12541 		 struct perf_event *parent_event,  in perf_event_alloc()  argument
12600 	event->parent		= parent_event;  in perf_event_alloc()
12607 	if (parent_event)  in perf_event_alloc()
12608 		event->event_caps = parent_event->event_caps;  in perf_event_alloc()
12621 	if (parent_event)  in perf_event_alloc()
12622 		event->clock = parent_event->clock;  in perf_event_alloc()
12624 	if (!overflow_handler && parent_event) {  in perf_event_alloc()
12625 		overflow_handler = parent_event->overflow_handler;  in perf_event_alloc()
12626 		context = parent_event->overflow_handler_context;  in perf_event_alloc()
12628 		if (parent_event->prog) {  in perf_event_alloc()
12629 			struct bpf_prog *prog = parent_event->prog;  in perf_event_alloc()
13669 	struct perf_event *parent_event = child_event->parent;  in sync_child_event()  local
13684 	atomic64_add(child_val, &parent_event->child_count);  in sync_child_event()
13686 		     &parent_event->child_total_time_enabled);  in sync_child_event()
13688 		     &parent_event->child_total_time_running);  in sync_child_event()
13694 	struct perf_event *parent_event = event->parent;  in perf_event_exit_event()  local
13697 	if (parent_event) {  in perf_event_exit_event()
13711 		mutex_lock(&parent_event->child_mutex);  in perf_event_exit_event()
13719 	if (parent_event) {  in perf_event_exit_event()
13720 		mutex_unlock(&parent_event->child_mutex);  in perf_event_exit_event()
13724 		perf_event_wakeup(parent_event);  in perf_event_exit_event()
13962 inherit_event(struct perf_event *parent_event,  in inherit_event()  argument
13969 	enum perf_event_state parent_state = parent_event->state;  in inherit_event()
13980 	if (parent_event->parent)  in inherit_event()
13981 		parent_event = parent_event->parent;  in inherit_event()
13983 	child_event = perf_event_alloc(&parent_event->attr,  in inherit_event()
13984 					   parent_event->cpu,  in inherit_event()
13986 					   group_leader, parent_event,  in inherit_event()
14007 	mutex_lock(&parent_event->child_mutex);  in inherit_event()
14008 	if (is_orphaned_event(parent_event) ||  in inherit_event()
14009 	    !atomic_long_inc_not_zero(&parent_event->refcount)) {  in inherit_event()
14010 		mutex_unlock(&parent_event->child_mutex);  in inherit_event()
14025 	if (parent_event->attr.freq) {  in inherit_event()
14026 		u64 sample_period = parent_event->hw.sample_period;  in inherit_event()
14035 	child_event->overflow_handler = parent_event->overflow_handler;  in inherit_event()
14037 		= parent_event->overflow_handler_context;  in inherit_event()
14056 	list_add_tail(&child_event->child_list, &parent_event->child_list);  in inherit_event()
14057 	mutex_unlock(&parent_event->child_mutex);  in inherit_event()
14072 static int inherit_group(struct perf_event *parent_event,  in inherit_group()  argument
14082 	leader = inherit_event(parent_event, parent, parent_ctx,  in inherit_group()
14091 	for_each_sibling_event(sub, parent_event) {  in inherit_group()
14097 		if (sub->aux_event == parent_event && child_ctr &&  in inherit_group()
14102 		leader->group_generation = parent_event->group_generation;  in inherit_group()