linux-ext4 - Re: simplify ext4_sb_read

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Message-ID: <YpjNf8WGfYh31F+2@mit.edu>
Date:   Thu, 2 Jun 2022 10:47:27 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     "Stephen E. Baker" <baker.stephen.e@...il.com>
Cc:     adilger.kernel@...ger.ca, hch@....de, linux-ext4@...r.kernel.org
Subject: Re: simplify ext4_sb_read_encoding regression

On Wed, Jun 01, 2022 at 10:06:04PM -0400, Stephen E. Baker wrote:
> On Mon, May 30, 2022 at 9:37 PM Theodore Ts'o <tytso@....edu> wrote:
> > > I don't know what to tell you.  I took your config, stripped out all
> > > of the modules, and enabled CONFIG_HYPERVISOR_GUEST,
> > > CONFIG_VIRTIO_MENU, and CONFIG_VIRTIO_BLK, and build a 5.16 kernel.
> >
> Maybe a silly question, but how do I enable CONFIG_HYPERVISOR_GUEST with
> this config.

So let's make things easy.  Attached please find my minimal config.
This is what I use when I normally build a test kernels, and I get it
by running "kvm-xfstests install-kconfig".  I use it because it's fast
to build, since it doesn't build extraneous stuff.  I've also attached
the "seb-config", which is your configuration with the minimal changes
needed so it can run under qemu.  The compressed size is twice as big,
and it takes 2-3 times longer to build.

I can't reproduce the problem you are seeing using kvm-xfstests using
either kernel config building on 5.17.

					- Ted

Download attachment "seb-config.gz" of type "application/gzip" (40524 bytes)

Download attachment "minimal-config.gz" of type "application/gzip" (18741 bytes)