From: Paul E. McKenney <paulmck@kernel.org>
Date: Thu, 14 Aug 2025 03:16:29 +0000 (-0700)
Subject: torture: Delay CPU-hotplug operations until boot completes
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=6e9c48b3e34b8ade2e6881c8b1f3838f5c2ab804;p=users%2Fhch%2Fmisc.git

torture: Delay CPU-hotplug operations until boot completes

CPU-hotplug operations invoke stop-machine, which 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/torture.c b/kernel/torture.c
index 5abb4b25d971..1ea9f67953a7 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -359,6 +359,8 @@ torture_onoff(void *arg)
 		torture_hrtimeout_jiffies(onoff_holdoff, &rand);
 		VERBOSE_TOROUT_STRING("torture_onoff end holdoff");
 	}
+	while (!rcu_inkernel_boot_has_ended())
+		schedule_timeout_interruptible(HZ / 10);
 	while (!torture_must_stop()) {
 		if (disable_onoff_at_boot && !rcu_inkernel_boot_has_ended()) {
 			torture_hrtimeout_jiffies(HZ / 10, &rand);