[PATCH 30/48] rcu-tasks: Replace exit_tasks_rcu_start() initialization with WARN_ON_ONCE()

[Uladzislau Rezki (Sony)]

From: "Paul E. McKenney" <paulmck@xxxxxxxxxx>

Because the Tasks RCU ->rtp_exit_list is initialized at rcu_init()
time while there is only one CPU running with interrupts disabled, it
is not possible for an exiting task to encounter an uninitialized list.
This commit therefore replaces the conditional initialization with
a WARN_ON_ONCE().

Reported-by: Frederic Weisbecker <frederic@xxxxxxxxxx>
Closes: https://lore.kernel.org/all/ZdiNXmO3wRvmzPsr@lothringen/
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
---
 kernel/rcu/tasks.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index 82e458ea0728..78d74c81cc24 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -1203,8 +1203,7 @@ void exit_tasks_rcu_start(void)
 	rtpcp = this_cpu_ptr(rcu_tasks.rtpcpu);
 	t->rcu_tasks_exit_cpu = smp_processor_id();
 	raw_spin_lock_irqsave_rcu_node(rtpcp, flags);
-	if (!rtpcp->rtp_exit_list.next)
-		INIT_LIST_HEAD(&rtpcp->rtp_exit_list);
+	WARN_ON_ONCE(!rtpcp->rtp_exit_list.next);
 	list_add(&t->rcu_tasks_exit_list, &rtpcp->rtp_exit_list);
 	raw_spin_unlock_irqrestore_rcu_node(rtpcp, flags);
 	preempt_enable();
-- 
2.39.2