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

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Date:   Wed, 1 Apr 2020 12:00:35 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Adam Borowski <kilobyte@...band.pl>
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 Wed, Apr 1, 2020 at 9:27 AM Adam Borowski <kilobyte@...band.pl> wrote:
>
> On Wed, Apr 01, 2020 at 02:52:06AM +0000, Nick Terrell wrote:
> > > On Mar 31, 2020, at 8:11 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> > > On Tue, Mar 31, 2020 at 6:15 AM Nick Terrell <terrelln@...com> wrote:

[...]

> > I don’t expect any distro specific changes are required to continue operating
> > as-is. However, if a distro wanted to switch to a zstd compressed initramfs
> > they would need to update their toolchain to compress with zstd.
>
> Just setting COMPRESS=zstd is enough -- it'll say:
> W: Unknown compression command zstd
> but will do everything right.
>
> Also, just minutes ago someone filed https://bugs.debian.org/955469
>

Hi Adam,

thanks for your feedback and the pointer to the Debian bug #955469.

With "distro-specific changes" I meant the ones to userland - for
Debian - namely initramfs-tools{,-core} packages.
For generating, inspecting and unpacking an initramfs the Debian way
you need a bit more.

In the Bug-BR a patch called "enable_zstd.patch" is attached - seems
to have all what I mentioned in [1].

Regards,
- Sedat -

[1] LINK: https://lore.kernel.org/lkml/CA+icZUXCn2an9aNDrm+-eneSAOyGibz0W1xYhwkA5k3B3U-5vQ@mail.gmail.com/