linux-kernel - Re: [PATCH] Documentation/sysctl: coredump: add %F for pidfd number

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Message-ID: <aEp5HBrBoU6mJALT@eldamar.lan>
Date: Thu, 12 Jun 2025 08:52:12 +0200
From: Salvatore Bonaccorso <carnil@...ian.org>
To: Jonathan Corbet <corbet@....net>
Cc: Christian Brauner <brauner@...nel.org>,
	Luca Boccassi <luca.boccassi@...il.com>,
	Oleg Nesterov <oleg@...hat.com>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Documentation/sysctl: coredump: add %F for pidfd number

Hi,

On Thu, Jun 12, 2025 at 08:02:04AM +0200, Salvatore Bonaccorso wrote:
> In commit b5325b2a270f ("coredump: hand a pidfd to the usermode coredump
> helper") a new core_pattern specifier, %F, was added to provide a pidfs
> to the usermode helper process referring to the crashed process.
> 
> Update the documentation to include the new core_pattern specifier.
> 
> Link: https://github.com/systemd/systemd/pull/37125
> Link: https://lwn.net/Articles/1024160/
> Signed-off-by: Salvatore Bonaccorso <carnil@...ian.org>
> ---
>  Documentation/admin-guide/sysctl/kernel.rst | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
> index dd49a89a62d3..f1b2ab219a08 100644
> --- a/Documentation/admin-guide/sysctl/kernel.rst
> +++ b/Documentation/admin-guide/sysctl/kernel.rst
> @@ -177,6 +177,7 @@ core_pattern
>  	%E		executable path
>  	%c		maximum size of core file by resource limit RLIMIT_CORE
>  	%C		CPU the task ran on
> +	%F		pidfd number
>  	%<OTHER>	both are dropped
>  	========	==========================================

FWIW, I was not sure if I should add a 'Fixes: b5325b2a270f
("coredump: hand a pidfd to the usermode coredump helper") to make
sure that it get backported as well to the series where a backport of
b5325b2a270f landed.

Regards,
Salvatore