rcu: Make call_rcu() lazy only when CONFIG_RCU_LAZY is enabled

qiangzh3 · chantra · commit 0ead14195f5d · 2022-10-20T07:48:22.000-07:00
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 &lt;qiang1.zhang@intel.com&gt;
Acked-by: Joel Fernandes (Google) &lt;joel@joelfernandes.org&gt;
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
@@ -2887,7 +2887,7 @@ EXPORT_SYMBOL_GPL(call_rcu_flush);
  */
 void call_rcu(struct rcu_head *head, rcu_callback_t func)
 {
-	return __call_rcu_common(head, func, true);
+	return __call_rcu_common(head, func, IS_ENABLED(CONFIG_RCU_LAZY));
 }
 EXPORT_SYMBOL_GPL(call_rcu);
 

Original file line number	Diff line number	Diff line change
`@@ -2887,7 +2887,7 @@ EXPORT_SYMBOL_GPL(call_rcu_flush);`
`2887`	`2887`	`*/`
`2888`	`2888`	`void call_rcu(struct rcu_head *head, rcu_callback_t func)`
`2889`	`2889`	`{`
`2890`		`- return __call_rcu_common(head, func, true);`
	`2890`	`+ return __call_rcu_common(head, func, IS_ENABLED(CONFIG_RCU_LAZY));`
`2891`	`2891`	`}`
`2892`	`2892`	`EXPORT_SYMBOL_GPL(call_rcu);`
`2893`	`2893`