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

Paul E. McKenney
2023-07-28T03:35:18Z

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(-)