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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2016-12-12 16:45:35 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 18:55:09 -0800
commit4ca5ede07c9871c13ae422c96d6d08dbd0df5eda (patch)
tree71b67a4356f091441bd67074ac41398b50cb323e
parent1270dd8d994039b677d0504ba7260873d608bf75 (diff)
downloadlinux-4ca5ede07c9871c13ae422c96d6d08dbd0df5eda.tar.bz2
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>
-rw-r--r--kernel/hung_task.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 2b59c82cc3e1..40c07e4fa116 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",