kfree_rcu
kfree_rcu(filp, rcu);
kfree_rcu(cm_node, rcu_head);
kfree_rcu(xa_val_level2, rcu);
kfree_rcu(xa_val_level2, rcu);
kfree_rcu(container_of(ref, struct ib_uobject, ref), rcu);