linux-kernel - Re: [PATCH v2 02/24] exec: Simplify unshare

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Message-ID: <CAK8P3a3z1tZSSSyK=tZOkUTqXvewJgd6ntHMysY0gGQ7hPWwfw@mail.gmail.com>
Date:   Tue, 24 Nov 2020 21:14:48 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Michael Ellerman <mpe@...erman.id.au>,
        Arnd Bergmann <arnd@...db.de>,
        Geoff Levand <geoff@...radead.org>
Subject: Re: [PATCH v2 02/24] exec: Simplify unshare_files

On Tue, Nov 24, 2020 at 8:58 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Tue, Nov 24, 2020 at 11:55 AM Eric W. Biederman
> <ebiederm@...ssion.com> wrote:
> >
> > If cell happens to be dead we can remove a fair amount of generic kernel
> > code that only exists to support cell.
>
> Even if some people might still use cell (which sounds unlikely), I
> think we can remove the spu core dumping code.

The Cell blade hardware (arch/powerpc/platforms/cell/) that I'm listed
as a maintainer for is very much dead, but there is apparently still some
activity on the Playstation 3 that Geoff Levand maintains.

Eric correctly points out that the PS3 firmware no longer boots
Linux (OtherOS), but AFAIK there are both users with old firmware
and those that use a firmware exploit to run homebrew code including
Linux.

I would assume they still use the SPU and might also use the core
dump code in particular. Let's see what Geoff thinks.

       Arnd