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Message-Id: <20251001144832.631770-14-paulmck@kernel.org>
Date: Wed,  1 Oct 2025 07:48:25 -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 v2 14/21] srcu: Make grace-period determination use ssp->srcu_reader_flavor

This commit causes the srcu_readers_unlock_idx() function to take the
srcu_struct structure's ->srcu_reader_flavor field into account.  This
ensures that structures defined via DEFINE_SRCU_FAST( or initialized via
init_srcu_struct_fast() have their grace periods use synchronize_srcu()
or synchronize_srcu_expedited() instead of smp_mb(), even before the
first SRCU reader has been entered.

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/srcutree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index 9869a13b876342..c29203b23d1ad7 100644
--- a/kernel/rcu/srcutree.c
+++ b/kernel/rcu/srcutree.c
@@ -490,7 +490,7 @@ static bool srcu_readers_lock_idx(struct srcu_struct *ssp, int idx, bool gp, uns
 static unsigned long srcu_readers_unlock_idx(struct srcu_struct *ssp, int idx, unsigned long *rdm)
 {
 	int cpu;
-	unsigned long mask = 0;
+	unsigned long mask = ssp->srcu_reader_flavor;
 	unsigned long sum = 0;
 
 	for_each_possible_cpu(cpu) {
-- 
2.40.1


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