call_rcu(&node->rcu_head, rcu_free_node);
}
+ /*
+ * We can also wait for a quiescent state by calling
+ * synchronize_rcu() rather than using call_rcu(). It is usually
+ * a slower approach than call_rcu(), because the latter can
+ * batch work. Moreover, call_rcu() can be called from a RCU
+ * read-side critical section, but synchronize_rcu() should not.
+ */
+ synchronize_rcu();
+
sleep(1);
/*