rcu_work
extern bool linux_queue_rcu_work(struct workqueue_struct *wq, struct rcu_work *rwork);
extern bool linux_flush_rcu_work(struct rcu_work *rwork);
struct rcu_work *rwork;
rwork = container_of(rcu, struct rcu_work, rcu);
linux_queue_rcu_work(struct workqueue_struct *wq, struct rcu_work *rwork)
linux_flush_rcu_work(struct rcu_work *rwork)