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rcu-tasks: Check for abandoned callbacks

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This commit adds a debugging scan for callbacks that got lost during a
callback-queueing transition.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-12-06 16:19:40 -08:00
parent a111daf0c5
commit 4cf0585c4d
1 changed files with 5 additions and 0 deletions
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5
kernel/rcu/tasks.h
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@ -439,6 +439,11 @@ static int rcu_tasks_need_gpcb(struct rcu_tasks *rtp)
WRITE_ONCE(rtp->percpu_dequeue_lim, 1);
pr_info("Completing switch %s to CPU-0 callback queuing.\n", rtp->name);
}
for (cpu = rtp->percpu_dequeue_lim; cpu < nr_cpu_ids; cpu++) {
struct rcu_tasks_percpu *rtpcp = per_cpu_ptr(rtp->rtpcpu, cpu);
WARN_ON_ONCE(rcu_segcblist_n_cbs(&rtpcp->cblist));
}
raw_spin_unlock_irqrestore(&rtp->cbs_gbl_lock, flags);
}