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

[Weitao Hou]

we need add necessary error info when core thread started failed

Signed-off-by: Weitao Hou <houweitao@xxxxxxxxxxxxxx>
---
 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