linux-kernel - Re: [PATCH] ia64: enable HAVE_COPY_THREAD_TLS, switch to kernel_clone

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Message-ID: <20200514083739.m2idxcxof4jyreck@wittgenstein>
Date:   Thu, 14 May 2020 10:37:39 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc:     "Luck, Tony" <tony.luck@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Qais Yousef <qais.yousef@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ia64: enable HAVE_COPY_THREAD_TLS, switch to
 kernel_clone_args

On Thu, May 14, 2020 at 10:24:25AM +0200, John Paul Adrian Glaubitz wrote:
> Hi!
> 
> On 5/14/20 9:58 AM, Christian Brauner wrote:
> >> The machine also serves as a Debian buildd which is why it's a bit more
> >> busy than other servers.
> > 
> > Oh? Does it also produce Debian images for ia64 similar to what is done
> > for sparc64?
> 
> Yes, it's actually the same person who does this - me ;).

Well thank you very much. Thanks to this I was able to test my sparc
patches in qemu. :)

> 
> These images should work just fine:
> 
> > https://cdimage.debian.org/cdimage/ports/2020-04-19/

Oh I didn't find these images when searching for them. They would be
super helpful but there's no qemu for ia64 anymore that's useable. I had
tried building qemu from an old source based on a gsoc project for an
ia64 port but that turned out to be more involved than writing ia64
assembly itself. :)

> 
> The latest snapshot is currently broken due to a regression in initramfs-tools.
> 
> >>>> As for getting a working cross-compiler for ia64 in Debian, this has
> >>>> been on my TODO list for a while now. Building a cross-compiler for
> >>>> ia64 is a bit more tricky due to it's dependency on the external
> >>>> libunwind.
> >>>
> >>> I hit that roadblock as well but yeah, a cross-compiler would be
> >>> helpful.
> >>
> >> It's not difficult, it's just a bit of annoying package work including
> >> some trial and error testing.
> >>
> >> Once the cross-compiler is in Debian, it will be available in Ubuntu as well.
> > 
> > Would that based on a recent gcc? I vaguely remember a post somwhere
> > that gcc 10 or 11 was planning to drop support for ia64?
> 
> Yes, that would be the latest gcc. There are no plans at the moment to
> drop ia64 from gcc as the backend is already ported to MODE_CC.
> 
> m68k was on the brink of being removed, but I started a Bountysource campaign
> to convert it from cc0 to MODE_CC and it was eventually saved ;).
> 
> > https://www.bountysource.com/issues/80706251-m68k-convert-the-backend-to-mode_cc-so-it-can-be-kept-in-future-releases

Oh that's pretty neat. Thanks!
Christian