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

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Message-ID: <20200514075808.krdtypxpag4tfa74@wittgenstein>
Date:   Thu, 14 May 2020 09:58:08 +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 09:53:49AM +0200, John Paul Adrian Glaubitz wrote:
> Hi Christian!
> 
> On 5/14/20 9:46 AM, Christian Brauner wrote:
> >>> My last functional ia64 machine no longer powers on. Unclear if it's just
> >>> a broken power supply or something more serious. With almost nobody
> >>> in offices/labs anymore my search for another machine is proceeding
> >>> slowly.
> >>
> >> I could test it.
> > 
> > Hey Adrian,
> > 
> > That would be excellent and much appreciated.
> > Do you think you can get it tested soon?
> 
> The kernel is currently building, you should get it by the evening (CEST).

Thank you!

> 
> 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?

> 
> >> 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?

Thanks for your help!
Christian