linux-kernel - [PATCH] srcu: Release early_srcu resources when no longer in use

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Date:   Thu, 10 Nov 2022 15:30:13 +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] srcu: Release early_srcu resources when no longer in use

When the "rcupdate.rcu_self_test = 1" is set in bootargs and CONFIG_SRCU
option is enabled, the early_srcu will be tested, currently, for TREE SRCU,
if "srcutree.convert_to_big = 1" is set, the srcu_node structure will be
allocated at invoke init_srcu_struct_fields() time, after the test is
completed, the early_srcu will not be used.
Therefore, this commit invoke cleanup_srcu_struct() to release srcu_node
structure.

Signed-off-by: Zqiang <qiang1.zhang@...el.com>
---
 kernel/rcu/update.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 738842c4886b..a05e23648c6b 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -589,6 +589,7 @@ static int rcu_verify_early_boot_tests(void)
 			early_boot_test_counter++;
 			srcu_barrier(&early_srcu);
 			WARN_ON_ONCE(!poll_state_synchronize_srcu(&early_srcu, early_srcu_cookie));
+			cleanup_srcu_struct(&early_srcu);
 		}
 	}
 	if (rcu_self_test_counter != early_boot_test_counter) {
-- 
2.25.1