linux-kernel - [PATCH 09/10] kernel/hung_task.c: export sysctl_hung_task_timeout

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Message-ID: <170873669034.1861398.8097801489286284855.stgit@frogsfrogsfrogs>
Date: Fri, 23 Feb 2024 17:16:05 -0800
From: "Darrick J. Wong" <djwong@...nel.org>
To: akpm@...ux-foundation.org, daniel@...o.nz, kent.overstreet@...ux.dev,
 djwong@...nel.org
Cc: fuyuanli <fuyuanli@...iglobal.com>, linux-xfs@...r.kernel.org,
 linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 09/10] kernel/hung_task.c: export
 sysctl_hung_task_timeout_secs

From: Kent Overstreet <kent.overstreet@...ux.dev>

needed for thread_with_file; also rare but not unheard of to need this
in module code, when blocking on user input.

one workaround used by some code is wait_event_interruptible() - but
that can be buggy if the outer context isn't expecting unwinding.

Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: fuyuanli <fuyuanli@...iglobal.com>
Reviewed-by: Darrick J. Wong <djwong@...nel.org>
Signed-off-by: Darrick J. Wong <djwong@...nel.org>
---
 kernel/hung_task.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 9a24574988d23..b2fc2727d6544 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -43,6 +43,7 @@ static int __read_mostly sysctl_hung_task_check_count = PID_MAX_LIMIT;
  * Zero means infinite timeout - no checking done:
  */
 unsigned long __read_mostly sysctl_hung_task_timeout_secs = CONFIG_DEFAULT_HUNG_TASK_TIMEOUT;
+EXPORT_SYMBOL_GPL(sysctl_hung_task_timeout_secs);

 /*
  * Zero (default value) means use sysctl_hung_task_timeout_secs: