linux-kernel - [PATCH v8 07/13] rcu/sync: Use call_rcu_flush() instead of call

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Message-Id: <20221011180142.2742289-8-joel@joelfernandes.org>
Date:   Tue, 11 Oct 2022 18:01:36 +0000
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, rushikesh.s.kadam@...el.com,
        urezki@...il.com, neeraj.iitr10@...il.com, frederic@...nel.org,
        paulmck@...nel.org, rostedt@...dmis.org, youssefesmat@...gle.com,
        surenb@...gle.com,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>
Subject: [PATCH v8 07/13] rcu/sync: Use call_rcu_flush() instead of call_rcu

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>
---
 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 5cefc702158f..bdce3b5d7f71 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);
 }
 
 /**
-- 
2.38.0.rc1.362.ged0d419d3c-goog