linux-kernel - [PATCH] docs: admin-guide: update description for kernel.hotplug sysctl

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Message-Id: <20210420120638.1104016-1-linux@rasmusvillemoes.dk>
Date:   Tue, 20 Apr 2021 14:06:38 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Jonathan Corbet <corbet@....net>,
        Kay Sievers <kay.sievers@...y.org>,
        Greg Kroah-Hartman <gregkh@...e.de>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] docs: admin-guide: update description for kernel.hotplug sysctl

It's been a few releases since this defaulted to /sbin/hotplug. Update
the text, and include pointers to the two CONFIG_UEVENT_HELPER{,_PATH}
config knobs whose help text could provide more info, but also hint
that the user probably doesn't need to care at all.

Fixes: 7934779a69f1 ("Driver-Core: disable /sbin/hotplug by default")
Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 Documentation/admin-guide/sysctl/kernel.rst | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
index 1d56a6b73a4e..c24f57f2c782 100644
--- a/Documentation/admin-guide/sysctl/kernel.rst
+++ b/Documentation/admin-guide/sysctl/kernel.rst
@@ -333,7 +333,12 @@ hotplug
 =======
 
 Path for the hotplug policy agent.
-Default value is "``/sbin/hotplug``".
+Default value is ``CONFIG_UEVENT_HELPER_PATH``, which in turn defaults
+to the empty string.
+
+This file only exists when ``CONFIG_UEVENT_HELPER`` is enabled. Most
+modern systems rely exclusively on the netlink-based uevent source and
+don't need this.
 
 
 hung_task_all_cpu_backtrace
-- 
2.29.2