linux-kernel - [PATCH v2 3/5] rcu-tasks: Correct check for no_hz_full cpu in show_stalled_task

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Date:   Wed, 25 Aug 2021 12:40:49 +0530
From:   Neeraj Upadhyay <neeraju@...eaurora.org>
To:     paulmck@...nel.org, josh@...htriplett.org, rostedt@...dmis.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        joel@...lfernandes.org
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        urezki@...il.com, frederic@...nel.org, boqun.feng@...il.com,
        Neeraj Upadhyay <neeraju@...eaurora.org>
Subject: [PATCH v2 3/5] rcu-tasks: Correct check for no_hz_full cpu in show_stalled_task_trace

Correct the check for no_hz_full cpu in show_stalled_task_trace(),
to include cpu 0.

Signed-off-by: Neeraj Upadhyay <neeraju@...eaurora.org>
---
 kernel/rcu/tasks.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index 9db7293..244e06a 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -1091,7 +1091,7 @@ static void show_stalled_task_trace(struct task_struct *t, bool *firstreport)
 		 t->pid,
 		 ".I"[READ_ONCE(t->trc_ipi_to_cpu) > 0],
 		 ".i"[is_idle_task(t)],
-		 ".N"[cpu > 0 && tick_nohz_full_cpu(cpu)],
+		 ".N"[cpu >= 0 && tick_nohz_full_cpu(cpu)],
 		 READ_ONCE(t->trc_reader_nesting),
 		 " N"[!!READ_ONCE(t->trc_reader_special.b.need_qs)],
 		 cpu);
-- 
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