linux-kernel - Re: [PATCH RFC bootconfig 0/2] Distinguish bootloader and embedded kernel parameters

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Date:   Thu, 27 Jul 2023 21:25:06 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     paulmck@...nel.org, akpm@...ux-foundation.org, adobriyan@...il.com,
        mhiramat@...nel.org
Cc:     arnd@...nel.org, ndesaulniers@...gle.com, sfr@...b.auug.org.au,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...a.com
Subject: Re: [PATCH RFC bootconfig 0/2] Distinguish bootloader and embedded
 kernel parameters



On 7/27/23 20:35, Paul E. McKenney wrote:
> Hello!
> 
> This series provides /proc interfaces parallel to /proc/cmdline that
> provide only those kernel boot parameters that were provided by the
> bootloader (/proc/cmdline_load) and only those parameters that were
> embedded in the kernel image (/proc/cmdline_image, in boot-config format).
> This is especially important when these parameters are presented to the
> boot loader by automation that might gather them from diverse sources,
> and also when a kexec-based reboot process pulls the kernel boot
> parameters from /proc.  If such a reboot process uses /proc/cmdline,
> the kernel parameters from the image are replicated on every reboot,
> which can be frustrating when the new kernel has different embedded
> kernel boot parameters.
> 
> Why put these in /proc?  Because they is quite similar to /proc/cmdline,
> so it makes sense to put it in the same place that /proc/cmdline is
> located.
> 
> 1.	fs/proc: Add /proc/cmdline_load for boot loader arguments.
> 
> 2.	fs/proc: Add /proc/cmdline_image for embedded arguments.
> 
> 						Thanx, Paul
> 

Hi Paul,

This series seems to be missing updates to
Documentation/filesystems/proc.rst.

Please add them.
Thanks.

> ------------------------------------------------------------------------
> 
>  b/fs/proc/cmdline.c    |   13 +++++++++++++
>  b/include/linux/init.h |    3 ++-
>  b/init/main.c          |    2 +-
>  fs/proc/cmdline.c      |   12 ++++++++++++
>  include/linux/init.h   |   11 ++++++-----
>  init/main.c            |    9 +++++++++
>  6 files changed, 43 insertions(+), 7 deletions(-)

-- 
~Randy