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 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();
}
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