+ hung_task-print-message-when-hung_task_warnings-gets-down-to-zero.patch added to mm-nonmm-unstable branch

+ hung_task-print-message-when-hung_task_warnings-gets-down-to-zero.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: hung_task: print message when hung_task_warnings gets down to zero.
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     hung_task-print-message-when-hung_task_warnings-gets-down-to-zero.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/hung_task-print-message-when-hung_task_warnings-gets-down-to-zero.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: fuyuanli <fuyuanli@didiglobal.com>
Subject: hung_task: print message when hung_task_warnings gets down to zero.
Date: Wed, 1 Feb 2023 21:54:33 +0800

It's useful to report it when hung_task_warnings gets down to zero, so
that we can know if kernel log was lost or there is no hung task was
detected.

Link: https://lkml.kernel.org/r/20230201135416.GA6560@didi-ThinkCentre-M920t-N000
Signed-off-by: fuyuanli <fuyuanli@didiglobal.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/kernel/hung_task.c~hung_task-print-message-when-hung_task_warnings-gets-down-to-zero
+++ a/kernel/hung_task.c
@@ -142,6 +142,8 @@ static void check_hung_task(struct task_
 
 		if (sysctl_hung_task_all_cpu_backtrace)
 			hung_task_show_all_bt = true;
+		if (!sysctl_hung_task_warnings)
+			pr_info("Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings\n");
 	}
 
 	touch_nmi_watchdog();
_

Patches currently in -mm which might be from fuyuanli@didiglobal.com are

hung_task-print-message-when-hung_task_warnings-gets-down-to-zero.patch