linux-kernel - [PATCH rcu 14/32] rcu-tasks: Flag offline CPUs in RCU Tasks Trace stall warnings

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Message-Id: <20220620225411.3842519-14-paulmck@kernel.org>
Date:   Mon, 20 Jun 2022 15:53:53 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        rostedt@...dmis.org, "Paul E. McKenney" <paulmck@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        KP Singh <kpsingh@...nel.org>
Subject: [PATCH rcu 14/32] rcu-tasks: Flag offline CPUs in RCU Tasks Trace stall warnings

This commit tags offline CPUs with "(offline)" in RCU Tasks Trace CPU
stall warnings.  This is a debugging aid.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: Neeraj Upadhyay <quic_neeraju@...cinc.com>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Andrii Nakryiko <andrii@...nel.org>
Cc: Martin KaFai Lau <kafai@...com>
Cc: KP Singh <kpsingh@...nel.org>
---
 kernel/rcu/tasks.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index 1cfbebf2b5977..93096188d3631 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -1502,14 +1502,14 @@ static void show_stalled_task_trace(struct task_struct *t, bool *firstreport)
 			 ".I"[t->trc_ipi_to_cpu >= 0],
 			 ".i"[is_idle_tsk]);
 	else
-		pr_alert("P%d: %c%c%c nesting: %d%c cpu: %d\n",
+		pr_alert("P%d: %c%c%c nesting: %d%c cpu: %d%s\n",
 			 t->pid,
 			 ".I"[trc_rdr.ipi_to_cpu >= 0],
 			 ".i"[is_idle_tsk],
 			 ".N"[cpu >= 0 && tick_nohz_full_cpu(cpu)],
 			 trc_rdr.nesting,
 			 " N"[!!trc_rdr.needqs],
-			 cpu);
+			 cpu, cpu_online(cpu) ? "" : "(offline)");
 	sched_show_task(t);
 }
 
-- 
2.31.1.189.g2e36527f23