linux-kernel - Re: [PATCH v3 0/8] Add support for ZSTD-compressed kernel and initramfs

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Date:   Wed, 1 Apr 2020 09:18:15 +0200
From:   Adam Borowski <kilobyte@...band.pl>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     Nick Terrell <terrelln@...com>,
        Nick Terrell <nickrterrell@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Chris Mason <clm@...com>,
        "linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Petr Malat <oss@...at.biz>, Kees Cook <keescook@...omium.org>,
        Kernel Team <Kernel-team@...com>,
        Patrick Williams <patrickw3@...com>,
        Michael van der Westhuizen <rmikey@...com>,
        "mingo@...nel.org" <mingo@...nel.org>,
        Patrick Williams <patrick@...cx.xyz>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v3 0/8] Add support for ZSTD-compressed kernel and
 initramfs

On Tue, Mar 31, 2020 at 05:11:35PM +0200, Sedat Dilek wrote:
> I have re-tested zstd-v3 patchset with Linux version 5.6 final and
> Clang/LLD version 10.0.0 final (from Debian/unstable repository).

So did I and a bunch of other folks.  I for one run v1 since 2017 on
a bunch of boxes (amd64/BIOS, amd64/EFI, arm64, armhf), without a glitch
(not counting trying to boot zstd initrd _without_ the patchset :p).

I've tried v2 on all of the above configurations, v3 on all but armhf, v4 on
amd64/EFI -- all is fine.

Back in the days, folks reported success on IIRC ppc64, sparc64 and more.

(Obviously, initrd only on !x86.)

> Is it possible to mention that there might distro-specific changes
> needed to initramfs-handling?
> For Debian you are welcome to include below Link [1].
> [1] LINK: https://lore.kernel.org/lkml/CA+icZUXCn2an9aNDrm+-eneSAOyGibz0W1xYhwkA5k3B3U-5vQ@mail.gmail.com/

+zstd)  compress="zstd -19 -v" ;;

I'm not sure if hard-coding -19 is always right.  It's good for production
machines but slows down dev cycles.

But that's a matter for userland, not a problem with Nick's patchset.


Meow!
-- 
⢀⣴⠾⠻⢶⣦⠀
⣾⠁⢠⠒⠀⣿⡁ in the beginning was the boot and root floppies and they were good.
⢿⡄⠘⠷⠚⠋⠀                                       -- <willmore> on #linux-sunxi
⠈⠳⣄⠀⠀⠀⠀