From 4cf0585c4d663654fefa0b359f1908b5cd72802b Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Mon, 6 Dec 2021 16:19:40 -0800 Subject: [PATCH] rcu-tasks: Check for abandoned callbacks This commit adds a debugging scan for callbacks that got lost during a callback-queueing transition. Signed-off-by: Paul E. McKenney --- kernel/rcu/tasks.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 3925e32159b5a..b8690a412c5bf 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -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); } -- 2.30.2