linux-kernel - [PATCH rcu 08/10] rcu: Test synchronous RCU grace periods at the end of rcu

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Message-Id: <20230105002305.1768591-8-paulmck@kernel.org>
Date:   Wed,  4 Jan 2023 16:23:03 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...a.com,
        rostedt@...dmis.org, "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 08/10] rcu: Test synchronous RCU grace periods at the end of rcu_init()

This commit tests synchronize_rcu() and synchronize_rcu_expedited()
at the end of rcu_init(), in addition to the test already at the
beginning of that function.  These tests are run only in kernels built
with CONFIG_PROVE_RCU=y.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/rcu/tree.c   | 2 ++
 kernel/rcu/update.c | 1 +
 2 files changed, 3 insertions(+)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 15f9765064727..80b84ae285b41 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -4849,6 +4849,8 @@ void __init rcu_init(void)
 	// Kick-start any polled grace periods that started early.
 	if (!(per_cpu_ptr(&rcu_data, cpu)->mynode->exp_seq_poll_rq & 0x1))
 		(void)start_poll_synchronize_rcu_expedited();
+
+	rcu_test_sync_prims();
 }
 
 #include "tree_stall.h"
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index f5e6a2f95a2a0..587b97c401914 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -220,6 +220,7 @@ void rcu_test_sync_prims(void)
 {
 	if (!IS_ENABLED(CONFIG_PROVE_RCU))
 		return;
+	pr_info("Running RCU synchronous self tests\n");
 	synchronize_rcu();
 	synchronize_rcu_expedited();
 }
-- 
2.31.1.189.g2e36527f23