linux-kernel - [PATCH] kernel/hung_task.c: add error info when failed to start khungtaskd

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Date:   Fri, 22 Oct 2021 16:47:55 +0800
From:   Weitao Hou <houweitao@...iglobal.com>
To:     <akpm@...ux-foundation.org>, <lukas.bulwahn@...il.com>,
        <sfr@...b.auug.org.au>, <linux@...musvillemoes.dk>,
        <peterz@...radead.org>, <penguin-kernel@...ove.sakura.ne.jp>,
        <andriy.shevchenko@...ux.intel.com>
CC:     <linux-kernel@...r.kernel.org>,
        Weitao Hou <houweitao@...iglobal.com>
Subject: [PATCH] kernel/hung_task.c: add error info when failed to start khungtaskd

we need add necessary error info when core thread started failed

Signed-off-by: Weitao Hou <houweitao@...iglobal.com>
---
 kernel/hung_task.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 8cc07e7f29aa..8a95997a693e 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -354,6 +354,10 @@ static int __init hung_task_init(void)
 	pm_notifier(hungtask_pm_notify, 0);
 
 	watchdog_task = kthread_run(watchdog, NULL, "khungtaskd");
+	if (IS_ERR(watchdog_task)) {
+		pr_err("Failed to start khungtaskd\n");
+		watchdog_task = NULL;
+	}
 
 	return 0;
 }
-- 
2.17.1