add ax88772_rst

hc

2024-05-10 9999e48639b3cecb08ffb37358bcba3b48161b29

 kernel/kernel/rcu/tree_exp.h
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@@ -507,7 +507,10 @@
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 				if (rdp->rcu_forced_tick_exp)
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 					continue;
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 				rdp->rcu_forced_tick_exp = true;
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-				tick_dep_set_cpu(cpu, TICK_DEP_BIT_RCU_EXP);
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+				preempt_disable();
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+				if (cpu_online(cpu))
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+					tick_dep_set_cpu(cpu, TICK_DEP_BIT_RCU_EXP);
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+				preempt_enable();
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 			}
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 		}
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 		j = READ_ONCE(jiffies_till_first_fqs);
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@@ -565,7 +568,9 @@
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 				mask = leaf_node_cpu_bit(rnp, cpu);
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 				if (!(READ_ONCE(rnp->expmask) & mask))
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 					continue;
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+				preempt_disable(); // For smp_processor_id() in dump_cpu_task().
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 				dump_cpu_task(cpu);
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+				preempt_enable();
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 			}
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 		}
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 		jiffies_stall = 3 * rcu_jiffies_till_stall_check() + 3;
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@@ -706,9 +711,11 @@
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 	int ndetected = 0;
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 	struct task_struct *t;
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-	if (!READ_ONCE(rnp->exp_tasks))
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-		return 0;
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 	raw_spin_lock_irqsave_rcu_node(rnp, flags);
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+	if (!rnp->exp_tasks) {
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+		raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
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+		return 0;
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+	}
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 	t = list_entry(rnp->exp_tasks->prev,
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 		       struct task_struct, rcu_node_entry);
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 	list_for_each_entry_continue(t, &rnp->blkd_tasks, rcu_node_entry) {