From 4ca5ede07c9871c13ae422c96d6d08dbd0df5eda Mon Sep 17 00:00:00 2001
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Mon, 12 Dec 2016 16:45:35 -0800
Subject: [PATCH] hung_task: decrement sysctl_hung_task_warnings only if it is
positive
Since sysctl_hung_task_warnings == -1 is allowed (infinite warnings),
commit 48a6d64edadb ("hung_task: allow hung_task_panic when
hung_task_warnings is 0") should decrement it only when it is not -1.
This prevents the kernel from ceasing warnings after the first
4294967295 ;)
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: John Siddle <jsiddle@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
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 2b59c82cc3e1b..40c07e4fa116e 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -106,7 +106,8 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
* complain:
*/
if (sysctl_hung_task_warnings) {
- sysctl_hung_task_warnings--;
+ if (sysctl_hung_task_warnings > 0)
+ sysctl_hung_task_warnings--;
pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n",
t->comm, t->pid, timeout);
pr_err(" %s %s %.*s\n",
--
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