linux-kernel - [PATCH] rcu: Make call_rcu() lazy only when CONFIG_RCU

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Message-Id: <20221019104045.160283-1-qiang1.zhang@intel.com>
Date:   Wed, 19 Oct 2022 18:40:45 +0800
From:   Zqiang <qiang1.zhang@...el.com>
To:     paulmck@...nel.org, frederic@...nel.org, joel@...lfernandes.org
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] rcu: Make call_rcu() lazy only when CONFIG_RCU_LAZY is enabled

Currently, regardless of whether the CONFIG_RCU_LAZY is enabled,
invoke the call_rcu() is always lazy, it also means that when
CONFIG_RCU_LAZY is disabled, invoke the call_rcu_flush() is also
lazy. therefore, this commit make call_rcu() lazy only when
CONFIG_RCU_LAZY is enabled.

Signed-off-by: Zqiang <qiang1.zhang@...el.com>
---
 kernel/rcu/tree.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index abc615808b6e..97ef602da3d5 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2839,7 +2839,6 @@ void call_rcu_flush(struct rcu_head *head, rcu_callback_t func)
 	return __call_rcu_common(head, func, false);
 }
 EXPORT_SYMBOL_GPL(call_rcu_flush);
-#endif
 
 /**
  * call_rcu() - Queue an RCU callback for invocation after a grace period.
@@ -2890,6 +2889,13 @@ void call_rcu(struct rcu_head *head, rcu_callback_t func)
 	return __call_rcu_common(head, func, true);
 }
 EXPORT_SYMBOL_GPL(call_rcu);
+#else
+void call_rcu(struct rcu_head *head, rcu_callback_t func)
+{
+	return __call_rcu_common(head, func, false);
+}
+EXPORT_SYMBOL_GPL(call_rcu);
+#endif
 
 /* Maximum number of jiffies to wait before draining a batch. */
 #define KFREE_DRAIN_JIFFIES (5 * HZ)
-- 
2.25.1