kernel/events/core.c

1192 		if (ctx->parent_ctx)
1193 			put_ctx(ctx->parent_ctx);
1311 	struct perf_event_context *parent_ctx = ctx->parent_ctx;
1315 	if (parent_ctx)
1316 		ctx->parent_ctx = NULL;
1319 	return parent_ctx;
3215 	WARN_ON_ONCE(event->ctx->parent_ctx);
3360 	if (ctx1 == ctx2->parent_ctx && ctx1->generation == ctx2->parent_gen)
3364 	if (ctx1->parent_ctx == ctx2 && ctx1->parent_gen == ctx2->generation)
3371 	if (ctx1->parent_ctx && ctx1->parent_ctx == ctx2->parent_ctx &&
3508 	parent = rcu_dereference(ctx->parent_ctx);
3509 	next_parent = rcu_dereference(next_ctx->parent_ctx);
5348 	WARN_ON_ONCE(ctx->parent_ctx);
5665 	WARN_ON_ONCE(event->ctx->parent_ctx);
5751 	WARN_ON_ONCE(event->ctx->parent_ctx);
6536 	WARN_ON_ONCE(event->ctx->parent_ctx);
12702 	WARN_ON_ONCE(ctx->parent_ctx);
12861 	WARN_ON_ONCE(ctx->parent_ctx);
13314 	      struct perf_event_context *parent_ctx,
13425 	      struct perf_event_context *parent_ctx,
13433 	leader = inherit_event(parent_event, parent, parent_ctx,
13443 		child_ctr = inherit_event(sub, parent, parent_ctx,
13470 		   struct perf_event_context *parent_ctx,
13500 	ret = inherit_group(event, parent, parent_ctx, child, child_ctx);
13512 	struct perf_event_context *child_ctx, *parent_ctx;
13527 	parent_ctx = perf_pin_task_context(parent);
13528 	if (!parent_ctx)
13532 	 * No need to check if parent_ctx != NULL here; since we saw
13542 	mutex_lock(&parent_ctx->mutex);
13548 	perf_event_groups_for_each(event, &parent_ctx->pinned_groups) {
13549 		ret = inherit_task_group(event, parent, parent_ctx,
13560 	raw_spin_lock_irqsave(&parent_ctx->lock, flags);
13561 	parent_ctx->rotate_disable = 1;
13562 	raw_spin_unlock_irqrestore(&parent_ctx->lock, flags);
13564 	perf_event_groups_for_each(event, &parent_ctx->flexible_groups) {
13565 		ret = inherit_task_group(event, parent, parent_ctx,
13571 	raw_spin_lock_irqsave(&parent_ctx->lock, flags);
13572 	parent_ctx->rotate_disable = 0;
13582 		 * parent_ctx->lock avoids it from being uncloned.
13584 		cloned_ctx = parent_ctx->parent_ctx;
13586 			child_ctx->parent_ctx = cloned_ctx;
13587 			child_ctx->parent_gen = parent_ctx->parent_gen;
13589 			child_ctx->parent_ctx = parent_ctx;
13590 			child_ctx->parent_gen = parent_ctx->generation;
13592 		get_ctx(child_ctx->parent_ctx);
13595 	raw_spin_unlock_irqrestore(&parent_ctx->lock, flags);
13597 	mutex_unlock(&parent_ctx->mutex);
13599 	perf_unpin_context(parent_ctx);
13600 	put_ctx(parent_ctx);