rcu-tasks: Replace exit_tasks_rcu_start() initialization with WARN_ON_ONCE()

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 <[email protected]>
Closes: https://lore.kernel.org/all/ZdiNXmO3wRvmzPsr@lothringen/
Signed-off-by: Paul E. McKenney <[email protected]>
Signed-off-by: Uladzislau Rezki (Sony) <[email protected]>

Author: paulmckrcu

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();