barrier_head 2864 kernel/rcu/tree.c rdp->barrier_head.func = rcu_barrier_callback; barrier_head 2865 kernel/rcu/tree.c debug_rcu_head_queue(&rdp->barrier_head); barrier_head 2868 kernel/rcu/tree.c if (rcu_segcblist_entrain(&rdp->cblist, &rdp->barrier_head, 0)) { barrier_head 2871 kernel/rcu/tree.c debug_rcu_head_unqueue(&rdp->barrier_head); barrier_head 192 kernel/rcu/tree.h struct rcu_head barrier_head;