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

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Message-ID: <20240209070935.1529844-1-kent.overstreet@linux.dev>
Date: Fri,  9 Feb 2024 02:09:35 -0500
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: linux-kernel@...r.kernel.org
Cc: Kent Overstreet <kent.overstreet@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>,
	fuyuanli <fuyuanli@...iglobal.com>
Subject: [PATCH] kernel/hung_task.c: export sysctl_hung_task_timeout_secs

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>
---
 kernel/hung_task.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 9a24574988d2..b2fc2727d654 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:
-- 
2.43.0