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| author | Paul E. McKenney <paulmck@kernel.org> | 2022-03-28 16:00:05 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-04-11 17:06:43 -0700 |
| commit | 10b3742f939c51d53619a31a5c03055c5e0952b4 (patch) | |
| tree | e99ed72c1c1b401b12355a822e6678b423e6c427 /kernel/rcu | |
| parent | bddf7122f7e321d5a677a695e8597064d987482c (diff) | |
| download | linux-10b3742f939c51d53619a31a5c03055c5e0952b4.tar.gz | |
rcu-tasks: Make show_rcu_tasks_generic_gp_kthread() check all CPUs
Currently, the show_rcu_tasks_generic_gp_kthread() function only looks
at CPU 0's callback lists. Although this is not fatal, it can confuse
debugging efforts in cases where any of the Tasks RCU flavors are in
per-CPU queueing mode. This commit therefore causes this function to
scan all CPUs' callback queues.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tasks.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 405614039515..3aad0dfbfaf4 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -582,7 +582,17 @@ static void __init rcu_tasks_bootup_oddness(void) /* Dump out rcutorture-relevant state common to all RCU-tasks flavors. */ static void show_rcu_tasks_generic_gp_kthread(struct rcu_tasks *rtp, char *s) { - struct rcu_tasks_percpu *rtpcp = per_cpu_ptr(rtp->rtpcpu, 0); // for_each... + int cpu; + bool havecbs = false; + + for_each_possible_cpu(cpu) { + struct rcu_tasks_percpu *rtpcp = per_cpu_ptr(rtp->rtpcpu, cpu); + + if (!data_race(rcu_segcblist_empty(&rtpcp->cblist))) { + havecbs = true; + break; + } + } pr_info("%s: %s(%d) since %lu g:%lu i:%lu/%lu %c%c %s\n", rtp->kname, tasks_gp_state_getname(rtp), data_race(rtp->gp_state), @@ -590,7 +600,7 @@ static void show_rcu_tasks_generic_gp_kthread(struct rcu_tasks *rtp, char *s) data_race(rcu_seq_current(&rtp->tasks_gp_seq)), data_race(rtp->n_ipis_fails), data_race(rtp->n_ipis), ".k"[!!data_race(rtp->kthread_ptr)], - ".C"[!data_race(rcu_segcblist_empty(&rtpcp->cblist))], + ".C"[havecbs], s); } #endif // #ifndef CONFIG_TINY_RCU |