linux-kernel - [PATCH v0 20/42] rcu: Check notifier registration return value

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Date:   Mon,  8 Nov 2021 11:11:35 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     rcu@...r.kernel.org
Subject: [PATCH v0 20/42] rcu: Check notifier registration return value

From: Borislav Petkov <bp@...e.de>

Avoid homegrown notifier registration checks.

No functional changes.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: rcu@...r.kernel.org
---
 kernel/rcu/tree_stall.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h
index 5e2fa6fd97f1..0c1d631214f4 100644
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h
@@ -101,7 +101,9 @@ static struct notifier_block rcu_panic_block = {
 
 static int __init check_cpu_stall_init(void)
 {
-	atomic_notifier_chain_register(&panic_notifier_list, &rcu_panic_block);
+	if (atomic_notifier_chain_register(&panic_notifier_list, &rcu_panic_block))
+		pr_warn("RCU warning suppress notifier already registered\n");
+
 	return 0;
 }
 early_initcall(check_cpu_stall_init);
-- 
2.29.2