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From: Frederic Weisbecker <frederic@kernel.org>
To: "Paul E . McKenney" <paulmck@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Frederic Weisbecker <frederic@kernel.org>,
	rcu@vger.kernel.org, urezki@gmail.com, boqun.feng@gmail.com,
	Neeraj Upadhyay <neeraju@codeaurora.org>,
	joel@joelfernandes.org
Subject: [PATCH 2/4] rcu: Remove useless WRITE_ONCE() on rcu_data.exp_deferred_qs
Date: Thu, 16 Sep 2021 14:10:46 +0200	[thread overview]
Message-ID: <20210916121048.36623-3-frederic@kernel.org> (raw)
In-Reply-To: <20210916121048.36623-1-frederic@kernel.org>

This variable is never written nor read remotely. Remove this confusion.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
---
 kernel/rcu/tree_exp.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index f3947c49eee7..4266610b4587 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -255,7 +255,7 @@ static void rcu_report_exp_cpu_mult(struct rcu_node *rnp,
  */
 static void rcu_report_exp_rdp(struct rcu_data *rdp)
 {
-	WRITE_ONCE(rdp->exp_deferred_qs, false);
+	rdp->exp_deferred_qs = false;
 	rcu_report_exp_cpu_mult(rdp->mynode, rdp->grpmask, true);
 }
 
-- 
2.25.1


  parent reply	other threads:[~2021-09-16 12:11 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-16 12:10 [PATCH 0/4] rcu: Unify a bit [non-]PREEMPT expedited quiescent state report Frederic Weisbecker
2021-09-16 12:10 ` [PATCH 1/4] rcu: Ignore rdp.cpu_no_qs.b.exp on premptible RCU's rcu_qs() Frederic Weisbecker
2021-09-16 12:10 ` Frederic Weisbecker [this message]
2021-09-16 16:43   ` [PATCH 2/4] rcu: Remove useless WRITE_ONCE() on rcu_data.exp_deferred_qs Paul E. McKenney
2021-09-16 21:05     ` Frederic Weisbecker
2021-09-17 18:10       ` Paul E. McKenney
2021-09-17 22:00         ` Frederic Weisbecker
2021-09-16 12:10 ` [PATCH 3/4] rcu: Move rcu_data.cpu_no_qs.b.exp reset to rcu_export_exp_rdp() Frederic Weisbecker
2021-09-16 12:10 ` [PATCH 4/4] rcu: Remove rcu_data.exp_deferred_qs and convert to rcu_data.cpu no_qs.b.exp Frederic Weisbecker
2021-09-16 16:40 ` [PATCH 0/4] rcu: Unify a bit [non-]PREEMPT expedited quiescent state report Paul E. McKenney
2021-09-28 18:13 ` Paul E. McKenney

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