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rcu-tasks: Make show_rcu_tasks_generic_gp_kthread() check all CPUs

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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>
This commit is contained in:
Paul E. McKenney 2022-03-28 16:00:05 -07:00
parent bddf7122f7
commit 10b3742f93
1 changed files with 12 additions and 2 deletions
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14
kernel/rcu/tasks.h
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@ -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