linux-kernel - [PATCH v0 19/42] kernel/hung_task: Check notifier registration return value

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Message-Id: <20211108101157.15189-20-bp@alien8.de>
Date:   Mon,  8 Nov 2021 11:11:34 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v0 19/42] kernel/hung_task: 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>
---
 kernel/hung_task.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 9888e2bc8c76..8e3bb95968a4 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -304,7 +304,8 @@ static int watchdog(void *dummy)
 
 static int __init hung_task_init(void)
 {
-	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
+	if (atomic_notifier_chain_register(&panic_notifier_list, &panic_block))
+		pr_warn("Hung task notifier already registered\n");
 
 	/* Disable hung task detector on suspend */
 	pm_notifier(hungtask_pm_notify, 0);
-- 
2.29.2