linux-kernel - [PATCH] rcu: Register rcu-lazy shrinker only CONFIG_RCU

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Date:   Mon, 30 Jan 2023 15:17:37 +0800
From:   Zqiang <qiang1.zhang@...el.com>
To:     paulmck@...nel.org, frederic@...nel.org, quic_neeraju@...cinc.com,
        joel@...lfernandes.org
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] rcu: Register rcu-lazy shrinker only CONFIG_RCU_LAZY is enabled

The rcu-lazy shrinker is registered without CONFIG_RCU_LAZY enabled
is meaningless, this commit therefore make rcu-lazy shrinker is
registered only when CONFIG_RCU_LAZY is enabled.

Signed-off-by: Zqiang <qiang1.zhang@...el.com>
---
 kernel/rcu/tree_nocb.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
index 9e1c8caec5ce..28c1c092817b 100644
--- a/kernel/rcu/tree_nocb.h
+++ b/kernel/rcu/tree_nocb.h
@@ -1312,6 +1312,7 @@ int rcu_nocb_cpu_offload(int cpu)
 }
 EXPORT_SYMBOL_GPL(rcu_nocb_cpu_offload);
 
+#ifdef CONFIG_RCU_LAZY
 static unsigned long
 lazy_rcu_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
 {
@@ -1360,6 +1361,7 @@ static struct shrinker lazy_rcu_shrinker = {
 	.batch = 0,
 	.seeks = DEFAULT_SEEKS,
 };
+#endif
 
 void __init rcu_init_nohz(void)
 {
@@ -1391,8 +1393,10 @@ void __init rcu_init_nohz(void)
 	if (!rcu_state.nocb_is_setup)
 		return;
 
+#ifdef CONFIG_RCU_LAZY
 	if (register_shrinker(&lazy_rcu_shrinker, "rcu-lazy"))
 		pr_err("Failed to register lazy_rcu shrinker!\n");
+#endif
 
 	if (!cpumask_subset(rcu_nocb_mask, cpu_possible_mask)) {
 		pr_info("\tNote: kernel parameter 'rcu_nocbs=', 'nohz_full', or 'isolcpus=' contains nonexistent CPUs.\n");
-- 
2.25.1