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@kernel.org>

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 5ee1113fbf392d85068a8b3f1194eb02516a7cdc..bc63a6b9d532638fe54cf3ae89161a40dae4b72c 100644 (file)
--- 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)],