[PATCH] khungtaskd: Kick stuck processes

[Chris Wilson]

After spotting a stuck process, and having decided not to panic, give
the task a kick to see if that helps it to recover (e.g. to paper over a
missed wake up).

References: https://bugs.freedesktop.org/show_bug.cgi?id=104009
References: https://bugs.freedesktop.org/show_bug.cgi?id=104682
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
 kernel/hung_task.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 751593ed7c0b..b32acb6bcc63 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -132,6 +132,8 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
 		trigger_all_cpu_backtrace();
 		panic("hung_task: blocked tasks");
 	}
+
+	wake_up_process(t);
 }
 
 /*
-- 
2.16.1