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

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Message-ID: <2e22b0d2-b9ce-420d-48a0-0d9134108a5c@physik.fu-berlin.de>
Date:   Thu, 14 May 2020 12:08:27 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Christian Brauner <christian.brauner@...ntu.com>
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 5/14/20 12:04 PM, Christian Brauner wrote:
> So that's interesting because systemd doesn't support itanium correctly afaict.
> They have a raw_clone() function that they use which is not tailored to
> ia64. __NR_clone should be defined as so to hit clone2() but they don't
> pass a stack size argument down which is invalid on ia64:
Ah, I wasn't aware of this limitation. I'm surprised the systemd testsuite passes
then on ia64.

On sparc64, Michael Karcher provided the hand-written assembly you quoted to
fix the raw_clone() on this architecture.

I assume we could do the same on ia64?

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@...ian.org
`. `'   Freie Universitaet Berlin - glaubitz@...sik.fu-berlin.de
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