linux-kernel - Re: [PATCH] initramfs: do not show compression mode choice if INITRAMFS

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Message-ID: <CAK7LNAREEkuZeXXzGbtemZ=A-YX6Jn6WOtD0azBxaiDiOxLp2w@mail.gmail.com>
Date:   Thu, 6 Feb 2020 10:53:44 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Thelen <gthelen@...gle.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH] initramfs: do not show compression mode choice if
 INITRAMFS_SOURCE is empty

Hi Linus,

On Tue, Feb 4, 2020 at 2:35 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Mon, Feb 3, 2020 at 4:47 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
> >
> > This commit hides the Kconfig choice in that case. The default cpio
> > is embedded without compression, which was the original behavior.
>
> Btw, is there any way to figure out automatically what the initrd
> compression is (for the external case)?
>
> Because I think it would be lovely to be able to have sane defaults
> for the CONFIG_RD_xyz things.
>
> I'm assuming the answer is "no", simply because it comes from distro
> installs, but I thought I'd check.

I think the answer is no.

For external initrd, it is up to distros,
and we have no way to know the compression type beforehand.

We know it after booting.

init/initramfs.c has the following line:
pr_debug("Detected %s compressed data\n", compress_name);



-- 
Best Regards
Masahiro Yamada