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

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

[Rasmus Villemoes]

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@rasmusvillemoes.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

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

[Rasmus Villemoes]

On 20/04/2021 14.06, Rasmus Villemoes wrote:
> 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@rasmusvillemoes.dk>

Ping.

> ---
>  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
> 

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

[Jonathan Corbet]

Rasmus Villemoes <linux@rasmusvillemoes.dk> writes:

> 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@rasmusvillemoes.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.

Applied, thanks.

jon