From: Paul E. McKenney <paulmck@kernel.org>
Date: Thu, 14 Aug 2025 03:41:04 +0000 (-0700)
Subject: rcutorture: Delay forward-progress testing until boot completes
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=51c285baa3fa04b95843da8e2f9895138ea64dd4;p=users%2Fhch%2Fmisc.git

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@kernel.org>
---

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 1578d3305657..b8a684459381 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);