rcu_jiffies_till_stall_check
int rcu_jiffies_till_stall_check(void);
.stall_dur = rcu_jiffies_till_stall_check,
jiffies + rcu_jiffies_till_stall_check());
rcu_check_gp_start_stall(rnp, rdp, rcu_jiffies_till_stall_check());
EXPORT_SYMBOL_GPL(rcu_jiffies_till_stall_check);
j1 = rcu_jiffies_till_stall_check();
jiffies + 3 * rcu_jiffies_till_stall_check() + 3);
jiffies + 3 * rcu_jiffies_till_stall_check() + 3);
jn = jiffies + 3 * rcu_jiffies_till_stall_check() + 3;
cpu_stall_timeout = jiffies_to_msecs(rcu_jiffies_till_stall_check());