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hung_task: decrement sysctl_hung_task_warnings only if it is positive 

Since sysctl_hung_task_warnings == -1 is allowed (infinite warnings),
commit 48a6d64eda ("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>
This commit is contained in:
Tetsuo Handa 2016-12-12 16:45:35 -08:00 committed by Linus Torvalds
parent 1270dd8d99
commit 4ca5ede07c
1 changed files with 2 additions and 1 deletions
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3
kernel/hung_task.c
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@ -106,7 +106,8 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
* complain: * complain:
*/ */
if (sysctl_hung_task_warnings) { 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", pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n",
t->comm, t->pid, timeout); t->comm, t->pid, timeout);
pr_err(" %s %s %.*s\n", pr_err(" %s %s %.*s\n",