linux-kernel - Re: [PATCH] m68k: Wire up clone3() syscall

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Message-ID: <CAMuHMdUmP4moBKAURp61E=K0-6Jiwi1OFayKS0h-yT17+mKCgQ@mail.gmail.com>
Date:   Mon, 13 Jan 2020 11:31:29 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     Kars de Jong <jongk@...ux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Linux/m68k" <linux-m68k@...r.kernel.org>,
        "Amanieu d'Antras" <amanieu@...il.com>
Subject: Re: [PATCH] m68k: Wire up clone3() syscall

Hi Christian,

On Mon, Jan 13, 2020 at 11:18 AM Christian Brauner
<christian.brauner@...ntu.com> wrote:
> On Mon, Jan 13, 2020 at 10:34:35AM +0100, Geert Uytterhoeven wrote:
> > On Mon, Jan 13, 2020 at 10:18 AM Christian Brauner
> > <christian.brauner@...ntu.com> wrote:
> > > On Mon, Jan 13, 2020 at 10:10:26AM +0100, Geert Uytterhoeven wrote:
> > > > On Sun, Jan 12, 2020 at 5:06 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > > > On Sun, Nov 24, 2019 at 8:52 PM Kars de Jong <jongk@...ux-m68k.org> wrote:
> > > > > > Wire up the clone3() syscall for m68k. The special entry point is done in
> > > > > > assembler as was done for clone() as well. This is needed because all
> > > > > > registers need to be saved. The C wrapper then calls the generic
> > > > > > sys_clone3() with the correct arguments.
> > > > > >
> > > > > > Tested on A1200 using the simple test program from:
> > > > > >
> > > > > >   https://lore.kernel.org/lkml/20190716130631.tohj4ub54md25dys@brauner.io/
> > > > > >
> > > > > > Cc: linux-m68k@...r.kernel.org
> > > > > > Signed-off-by: Kars de Jong <jongk@...ux-m68k.org>
> > > > >
> > > > > Thanks, applied and queued for v5.6.
> > > >
> > > > Which is now broken because of commit dd499f7a7e342702 ("clone3: ensure
> > > > copy_thread_tls is implemented") in v5.5-rc6 :-(
> > >
> > > Sorry, just for clarification what and how is it broken by
> > > dd499f7a7e342702 ("clone3: ensure > copy_thread_tls is implemented")
> > > ?
> >
> > Because m68k does not implement copy_thread_tls() yet, and doesn't
> > select HAVE_COPY_THREAD_TLS yet.
>
> Oh right, sorry. I forgot that m68k has a patchset to enable clone3() up
> for merging. I should've remembered that and warned you that we will
> have to require copy_thread_tls() going forward. I hope the merge is
> explanatory enough why we're doing it this way.

Yeah, an early warning would have been nice...

> > Looking into fixing that...
>
> Thank you! Much appreciated!

Patch sent.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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