[no subject]
From: Zhang, Qiang
Date: Wed Sep 09 2020 - 02:35:25 EST
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();
}