linux-kernel - [PATCH rcu 13/17] rcutorture: Avoid soft lockup during cpu stall

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Message-Id: <20211202004337.3130175-13-paulmck@kernel.org>
Date:   Wed,  1 Dec 2021 16:43:32 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, akpm@...ux-foundation.org,
        mathieu.desnoyers@...icios.com, josh@...htriplett.org,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org,
        Wander Lairson Costa <wander@...hat.com>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 13/17] rcutorture: Avoid soft lockup during cpu stall

From: Wander Lairson Costa <wander@...hat.com>

If we use the module stall_cpu option, we may get a soft lockup warning
in case we also don't pass the stall_cpu_block option.

Introduce the stall_no_softlockup option to avoid a soft lockup on
cpu stall even if we don't use the stall_cpu_block option.

Signed-off-by: Wander Lairson Costa <wander@...hat.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/rcu/rcutorture.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 36a273589a35c..bc854f9355488 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -46,6 +46,7 @@
 #include <linux/oom.h>
 #include <linux/tick.h>
 #include <linux/rcupdate_trace.h>
+#include <linux/nmi.h>
 
 #include "rcu.h"
 
@@ -112,6 +113,8 @@ torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable.");
 torture_param(int, stall_cpu, 0, "Stall duration (s), zero to disable.");
 torture_param(int, stall_cpu_holdoff, 10,
 	     "Time to wait before starting stall (s).");
+torture_param(bool, stall_no_softlockup, false,
+	     "Avoid softlockup warning during cpu stall.");
 torture_param(int, stall_cpu_irqsoff, 0, "Disable interrupts while stalling.");
 torture_param(int, stall_cpu_block, 0, "Sleep while stalling.");
 torture_param(int, stall_gp_kthread, 0,
@@ -2085,6 +2088,8 @@ static int rcu_torture_stall(void *args)
 #else
 				schedule_timeout_uninterruptible(HZ);
 #endif
+			} else if (stall_no_softlockup) {
+				touch_softlockup_watchdog();
 			}
 		if (stall_cpu_irqsoff)
 			local_irq_enable();
-- 
2.31.1.189.g2e36527f23