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

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Date:   Thu, 27 Jul 2023 20:35:10 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     akpm@...ux-foundation.org, adobriyan@...il.com, mhiramat@...nel.org
Cc:     arnd@...nel.org, ndesaulniers@...gle.com, paulmck@...nel.org,
        sfr@...b.auug.org.au, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...a.com
Subject: [PATCH RFC bootconfig 0/2] Distinguish bootloader and embedded
 kernel parameters

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

------------------------------------------------------------------------

 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(-)