[tip: core/rcu] rcu/nocb: Add nocb CB kthread list to show_rcu_nocb_state() output

[tip-bot2 for Paul E. McKenney]

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     3d0cef50f32e2bc69f60909584c18623bba9a6c6
Gitweb:        https://git.kernel.org/tip/3d0cef50f32e2bc69f60909584c18623bba9a6c6
Author:        Paul E. McKenney <paulmck@xxxxxxxxxx>
AuthorDate:    Fri, 18 Dec 2020 13:17:37 -08:00
Committer:     Paul E. McKenney <paulmck@xxxxxxxxxx>
CommitterDate: Wed, 06 Jan 2021 16:25:00 -08:00

rcu/nocb: Add nocb CB kthread list to show_rcu_nocb_state() output

This commit improves debuggability by indicating laying out the order
in which rcuoc kthreads appear in the ->nocb_next_cb_rdp list.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
 kernel/rcu/tree_plugin.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 5ee1113..bc63a6b 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -2730,6 +2730,7 @@ static void show_rcu_nocb_state(struct rcu_data *rdp)
 	sprintf(bufr, "%ld", rsclp->gp_seq[RCU_NEXT_READY_TAIL]);
 	pr_info("   CB %d^%d->%d %c%c%c%c%c%c F%ld L%ld C%d %c%c%s%c%s%c%c q%ld %c CPU %d%s\n",
 		rdp->cpu, rdp->nocb_gp_rdp->cpu,
+		rdp->nocb_next_cb_rdp ? rdp->nocb_next_cb_rdp->cpu : -1,
 		"kK"[!!rdp->nocb_cb_kthread],
 		"bB"[raw_spin_is_locked(&rdp->nocb_bypass_lock)],
 		"cC"[!!atomic_read(&rdp->nocb_lock_contended)],