linux-kernel - [PATCH v4 1/6] rcutorture: Add context checks to rcu_torture

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Message-Id: <20251229191358.693753-1-paulmck@kernel.org>
Date: Mon, 29 Dec 2025 11:13:53 -0800
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 v4 1/6] rcutorture: Add context checks to rcu_torture_timer()

This commit adds irq, NMI, and softirq context checks to the
rcu_torture_timer() function.  Just because you are paranoid does not
mean that they are not out to get you...  ;-)

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/rcu/rcutorture.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index d00b043823aef..63053031ade21 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -2454,6 +2454,9 @@ static DEFINE_TORTURE_RANDOM_PERCPU(rcu_torture_timer_rand);
  */
 static void rcu_torture_timer(struct timer_list *unused)
 {
+	WARN_ON_ONCE(!in_serving_softirq());
+	WARN_ON_ONCE(in_hardirq());
+	WARN_ON_ONCE(in_nmi());
 	atomic_long_inc(&n_rcu_torture_timers);
 	(void)rcu_torture_one_read(this_cpu_ptr(&rcu_torture_timer_rand), -1);
 
-- 
2.40.1