linux-kernel - [PATCH 7/7] rcutorture: Delay forward-progress testing until boot completes

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Message-Id: <20250816000837.2622858-7-paulmck@kernel.org>
Date: Fri, 15 Aug 2025 17:08:37 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	rostedt@...dmis.org,
	"Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH 7/7] rcutorture: Delay forward-progress testing until boot completes

Forward-progress testing can hog CPUs, which is not a great thing to do
before boot has completed.  This commit therefore makes the CPU-hotplug
operations hold off until boot has completed.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/rcu/rcutorture.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 1578d330565752..b8a684459381f2 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -3457,6 +3457,8 @@ static int rcu_torture_fwd_prog(void *args)
 	int tested_tries = 0;
 
 	VERBOSE_TOROUT_STRING("rcu_torture_fwd_progress task started");
+	while (!rcu_inkernel_boot_has_ended())
+		schedule_timeout_interruptible(HZ / 10);
 	rcu_bind_current_to_nocb();
 	if (!IS_ENABLED(CONFIG_SMP) || !IS_ENABLED(CONFIG_RCU_BOOST))
 		set_user_nice(current, MAX_NICE);
-- 
2.40.1