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From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Mon, 28 Jun 2021 21:17:33 +0200
Message-ID: <CAMuHMdUi5Ri=GmWzS8hb7dkfPyAE=HpQHg6OsKSLDse_364E=g@mail.gmail.com>
Subject: Re: [PATCH 0/9] Refactoring exit
To:     Michael Schmitz <schmitzmic@gmail.com>
Cc:     Al Viro <viro@zeniv.linux.org.uk>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-arch <linux-arch@vger.kernel.org>,
        Jens Axboe <axboe@kernel.dk>, Oleg Nesterov <oleg@redhat.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Richard Henderson <rth@twiddle.net>,
        Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
        Matt Turner <mattst88@gmail.com>,
        alpha <linux-alpha@vger.kernel.org>,
        linux-m68k <linux-m68k@lists.linux-m68k.org>,
        Arnd Bergmann <arnd@kernel.org>, Tejun Heo <tj@kernel.org>,
        Kees Cook <keescook@chromium.org>
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Hi Michael,

On Mon, Jun 28, 2021 at 7:14 PM Michael Schmitz <schmitzmic@gmail.com> wrote:
> Am 28.06.2021 um 19:31 schrieb Geert Uytterhoeven:
> >> Haven't found that warning in over 7 years' worth of console logs, and
> >> I'm a good candidate for running the oldest userland in existence for m68k.
> >>
> >> Time to let it go.
> >
> > The warning is printed when using filesys-ELF-2.0.x-1400K-2.gz,
> > which is a very old ramdisk from right after the m68k a.out to ELF
> > transition:
> >
> >     warning: process `update' used the obsolete bdflush system call
> >     Fix your initscripts?
> >
> > I still boot it, once in a while.
>
> OK; you take the cake. That ramdisk came to mind when I thought about
> where I'd last seen bdflush, but I've not used it in ages (not sure 14
> MB are enough for that).

Of course it will work on your 14 MiB machine!  It fits on a floppy, _after_
decompression.  It was used by people to install Linux on the hard disks
of their beefy m68k machines, after they had set up the family Christmas
tree, in December 1996.

I also have a slightly larger one, built from OpenWRT when I did my first
experiments on that.  Unlike filesys-ELF-2.0.x-1400K-2.gz, it does open
a shell on the serial console, so it is more useful to me.

> The question then is - will bdflush fail gracefully, or spin retrying
> the syscall?

Will add to my todo list...
BTW, you can boot this ramdisk on ARAnyM, too.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds