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Date:   Wed, 9 Sep 2020 06:35:15 +0000
From:   "Zhang, Qiang" <Qiang.Zhang@...driver.com>
To:     Joel Fernandes <joel@...lfernandes.org>,
        "paulmck@...nel.org" <paulmck@...nel.org>
CC:     Uladzislau Rezki <urezki@...il.com>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        rcu <rcu@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: 

 When config preempt RCU,  if task switch happened in rcu  read critical region.
 the current task be add to "rnp->blkd_tasks" link list,  these rnp is leaf node in RCU    tree.
 In "rcu_gp_fqs_loop" func, 

static void rcu_gp_fqs_loop(void)
 {

            struct rcu_node *rnp = rcu_get_root();
}