linux-kernel - [PATCH 30/34] rcutorture: Exercise DEFINE_STATIC_SRCU_FAST() and init_srcu_struct

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Message-Id: <20250923142036.112290-30-paulmck@kernel.org>
Date: Tue, 23 Sep 2025 07:20:32 -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>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	bpf@...r.kernel.org
Subject: [PATCH 30/34] rcutorture: Exercise DEFINE_STATIC_SRCU_FAST() and init_srcu_struct_fast()

This commit updates the initialization for the "srcu" and "srcud" torture
types to use DEFINE_STATIC_SRCU_FAST() and init_srcu_struct_fast(),
respectively, when reader_flavor is equal to SRCU_READ_FLAVOR_FAST.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: <bpf@...r.kernel.org>
---
 kernel/rcu/rcutorture.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 2e3806b996a80a..e859a1ca7dc841 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -692,10 +692,18 @@ static struct rcu_torture_ops rcu_busted_ops = {
  */
 
 DEFINE_STATIC_SRCU(srcu_ctl);
+DEFINE_STATIC_SRCU_FAST(srcu_ctlf);
 static struct srcu_struct srcu_ctld;
 static struct srcu_struct *srcu_ctlp = &srcu_ctl;
 static struct rcu_torture_ops srcud_ops;
 
+static void srcu_torture_init(void)
+{
+	rcu_sync_torture_init();
+	if (reader_flavor & SRCU_READ_FLAVOR_FAST)
+		srcu_ctlp = &srcu_ctlf;
+}
+
 static void srcu_get_gp_data(int *flags, unsigned long *gp_seq)
 {
 	srcutorture_get_gp_data(srcu_ctlp, flags, gp_seq);
@@ -865,7 +873,7 @@ static void srcu_torture_expedite_current(void)
 
 static struct rcu_torture_ops srcu_ops = {
 	.ttype		= SRCU_FLAVOR,
-	.init		= rcu_sync_torture_init,
+	.init		= srcu_torture_init,
 	.readlock	= srcu_torture_read_lock,
 	.read_delay	= srcu_read_delay,
 	.readunlock	= srcu_torture_read_unlock,
@@ -897,10 +905,13 @@ static struct rcu_torture_ops srcu_ops = {
 	.name		= "srcu"
 };
 
-static void srcu_torture_init(void)
+static void srcud_torture_init(void)
 {
 	rcu_sync_torture_init();
-	WARN_ON(init_srcu_struct(&srcu_ctld));
+	if (reader_flavor & SRCU_READ_FLAVOR_FAST)
+		WARN_ON(init_srcu_struct_fast(&srcu_ctld));
+	else
+		WARN_ON(init_srcu_struct(&srcu_ctld));
 	srcu_ctlp = &srcu_ctld;
 }
 
@@ -913,7 +924,7 @@ static void srcu_torture_cleanup(void)
 /* As above, but dynamically allocated. */
 static struct rcu_torture_ops srcud_ops = {
 	.ttype		= SRCU_FLAVOR,
-	.init		= srcu_torture_init,
+	.init		= srcud_torture_init,
 	.cleanup	= srcu_torture_cleanup,
 	.readlock	= srcu_torture_read_lock,
 	.read_delay	= srcu_read_delay,
-- 
2.40.1