linux-kernel - Re: [PATCH v8 2/5] x86: Add cmdline

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Date:   Tue, 15 Nov 2022 19:58:41 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Evgeniy Baskov <baskov@...ras.ru>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>
Subject: Re: [PATCH v8 2/5] x86: Add cmdline_prepare() helper

On Mon, Nov 14, 2022 at 03:28:55PM +0100, Borislav Petkov wrote:
> So now it is my turn: I'll do it how I think it should be done and you
> can review it.

Ok, here are two patches as a reply to this message.

I was able to test them as much as I can in a VM here but I'd need more
details/testing in your configuration with earlyprintk as a builtin
cmdline.

cmdline_prepare() has grown a bit hairy in the end but I've tried hard
to comment what happens there so that it is clear for the future. The
main goal being to concentrate all command line strings processing in
that function and not have it spread around the tree. And yes, there are
more cleanups possible.

In the compressed stage I'm using the cmdline which is in boot_params as
source and destination to basically add only the builtin cmdline.

In kernel proper the boot_command_line comes from generic code and that
is a whole another way of crazy in itself when I look at init/main.c

And as previously stated - the goal is to have everything in one place
and documented as good as possible so that trying to figure out how
command line parsing is done doesn't send you on grepping spree around
the tree.

Suggestions how to simplify this even more are always welcome, ofc.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette