linux-kernel - [PATCH 0/5] Patches used to build mkroot.

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Message-ID: <b455394f-9faa-1f1a-f171-0b9d5e9ada35@landley.net>
Date:   Tue, 21 Feb 2023 14:53:30 -0600
From:   Rob Landley <rob@...dley.net>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Halaney <ahalaney@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        linux-kbuild@...r.kernel.org, Li Zhe <lizhe.67@...edance.com>,
        llvm@...ts.linux.dev, Mark-PK Tsai <mark-pk.tsai@...iatek.com>,
        Mark Rutland <mark.rutland@....com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 0/5] Patches used to build mkroot.

The ~300 line bash script in toybox that builds bootable Linux systems
for a dozen-ish targets can use a vanilla kernel, but the binaries I
ship are built from a kernel with these patches:

https://github.com/landley/toybox/blob/master/scripts/mkroot.sh
https://landley.net/toybox/downloads/binaries/mkroot/0.8.9/

I've posted each patch to the list already, but here they are together
and updated for 6.2:

1) let LLVM build normally without telling Linux on the command line
This way I can mix CROSS_COMPILE=$ARCH-unknown-linux-cross- without
having to care that some are llvm and some are gcc.

2) don't require an extra dependency to build x86-64 no other target needs.

3) Make CONFIG_DEVTMPFS_MOUNT work in initramfs. That way having
the kernel build archive up a directory into a cpio.gz as a normal
user doesn't leave me without a /dev/console and thus init running
with stdin/stderr/stdout closed.

4) Replace the only user of bc with c. (Another package dependency
with only one user.)

5) Fix rootfstype=tmpfs in initramfs. (A thinko I made in 2013 which
nobody else has bothered to fix for a decade now.)