linux-kernel - [PATCH] rcutorture: Add fqs_holdoff check before the fqs

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Message-Id: <20231103072639.11426-1-qiang.zhang1211@gmail.com>
Date:   Fri,  3 Nov 2023 15:26:39 +0800
From:   Zqiang <qiang.zhang1211@...il.com>
To:     paulmck@...nel.org, frederic@...nel.org, joel@...lfernandes.org
Cc:     qiang.zhang1211@...il.com, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] rcutorture: Add fqs_holdoff check before the fqs_task is created

For rcutorture tests that support fqs operations and set fqs_duration
greater than zero, the fqs_task kthread will be created. but if the
fqs_holdoff is not set, the default value is zero, this cause fqs_task
enter a long-term busy loop and won't voluntarily give up the CPU until
stopped by kthread_stop(). this commit therefore add for fqs_holdoff check
before the fqs_task is created, make sure the fqs_task is created when
the fqs_holdoff is also greater than zero.

Signed-off-by: Zqiang <qiang.zhang1211@...il.com>
---
 kernel/rcu/rcutorture.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 83999e57b3ea..9f0e6c1cad44 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -3886,7 +3886,9 @@ rcu_torture_init(void)
 	}
 	if (fqs_duration < 0)
 		fqs_duration = 0;
-	if (fqs_duration) {
+	if (fqs_holdoff < 0)
+		fqs_holdoff = 0;
+	if (fqs_duration && fqs_holdoff) {
 		/* Create the fqs thread */
 		firsterr = torture_create_kthread(rcu_torture_fqs, NULL,
 						  fqs_task);
-- 
2.17.1