linux-kernel - [PATCH v2 rcu 09/16] rcu/sync: Use call_rcu_flush() instead of call

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Message-Id: <20221122010421.3799681-9-paulmck@kernel.org>
Date:   Mon, 21 Nov 2022 17:04:14 -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,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH v2 rcu 09/16] rcu/sync: Use call_rcu_flush() instead of call_rcu

From: "Joel Fernandes (Google)" <joel@...lfernandes.org>

call_rcu() changes to save power will slow down rcu sync. Use the
call_rcu_flush() API instead which reverts to the old behavior.

Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/rcu/sync.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/sync.c b/kernel/rcu/sync.c
index 5cefc702158fe..bdce3b5d7f714 100644
--- a/kernel/rcu/sync.c
+++ b/kernel/rcu/sync.c
@@ -44,7 +44,7 @@ static void rcu_sync_func(struct rcu_head *rhp);
 
 static void rcu_sync_call(struct rcu_sync *rsp)
 {
-	call_rcu(&rsp->cb_head, rcu_sync_func);
+	call_rcu_flush(&rsp->cb_head, rcu_sync_func);
 }
 
 /**
-- 
2.31.1.189.g2e36527f23