Unverified Commit c7a8bada authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!7538 v2 rcu: shorten the critical section that rnp->lock protects in rcu_dump_cpu_stacks 

Merge Pull Request from: @ci-robot 
 
PR sync from: Wei Li <liwei391@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/JEREN2HRH3N6KJGJ7JX3MWGOS3UGCJYN/ 
 
https://gitee.com/openeuler/kernel/issues/I7MQJB 
 
Link:https://gitee.com/openeuler/kernel/pulls/7538

 

Reviewed-by: default avatarXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: default avatarJialin Zhang <zhangjialin11@huawei.com>
parents f7aa4d73 9bc31825

kernel/rcu/tree_stall.h

+2 −0
Original line number Diff line number Diff line
@@ -334,10 +334,12 @@ static void rcu_dump_cpu_stacks(void) 
		raw_spin_lock_irqsave_rcu_node(rnp, flags);

		for_each_leaf_node_possible_cpu(rnp, cpu)

			if (rnp->qsmask & leaf_node_cpu_bit(rnp, cpu)) {

				raw_spin_unlock_irqrestore_rcu_node(rnp, flags);

				if (cpu_is_offline(cpu))

					pr_err("Offline CPU %d blocking current GP.\n", cpu);

				else

					dump_cpu_task(cpu);

				raw_spin_lock_irqsave_rcu_node(rnp, flags);

			}

		raw_spin_unlock_irqrestore_rcu_node(rnp, flags);

	}