linux-kernel - [PATCH 31/34] refscale: Exercise DEFINE_STATIC_SRCU_FAST() and init_srcu_struct

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Message-Id: <20250923142036.112290-31-paulmck@kernel.org>
Date: Tue, 23 Sep 2025 07:20:33 -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 31/34] refscale: Exercise DEFINE_STATIC_SRCU_FAST() and init_srcu_struct_fast()

This commit updates the initialization for the "srcu-fast" scale
type to use DEFINE_STATIC_SRCU_FAST() 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/refscale.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
index 19841704d8f579..ece77f6d055b85 100644
--- a/kernel/rcu/refscale.c
+++ b/kernel/rcu/refscale.c
@@ -184,6 +184,7 @@ static const struct ref_scale_ops rcu_ops = {
 
 // Definitions for SRCU ref scale testing.
 DEFINE_STATIC_SRCU(srcu_refctl_scale);
+DEFINE_STATIC_SRCU_FAST(srcu_fast_refctl_scale);
 static struct srcu_struct *srcu_ctlp = &srcu_refctl_scale;
 
 static void srcu_ref_scale_read_section(const int nloops)
@@ -216,6 +217,12 @@ static const struct ref_scale_ops srcu_ops = {
 	.name		= "srcu"
 };
 
+static bool srcu_fast_sync_scale_init(void)
+{
+	srcu_ctlp = &srcu_fast_refctl_scale;
+	return true;
+}
+
 static void srcu_fast_ref_scale_read_section(const int nloops)
 {
 	int i;
@@ -240,7 +247,7 @@ static void srcu_fast_ref_scale_delay_section(const int nloops, const int udl, c
 }
 
 static const struct ref_scale_ops srcu_fast_ops = {
-	.init		= rcu_sync_scale_init,
+	.init		= srcu_fast_sync_scale_init,
 	.readsection	= srcu_fast_ref_scale_read_section,
 	.delaysection	= srcu_fast_ref_scale_delay_section,
 	.name		= "srcu-fast"
-- 
2.40.1