Re: [PATCH] futex: Set USER_DS for the futex_detect_cmpxchg() test

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To: Max Filippov <jcmvbkbc@xxxxxxxxx>
Subject: Re: [PATCH] futex: Set USER_DS for the futex_detect_cmpxchg() test
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Date: Fri, 28 Sep 2018 22:26:48 +0200 (CEST)
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>, Martin Schwidefsky <schwidefsky@xxxxxxxxxx>, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>, Andrew Lutomirski <luto@xxxxxxxxxx>, X86 ML <x86@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Darren Hart <dvhart@xxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-s390 <linux-s390@xxxxxxxxxxxxxxx>, Heiko Carstens <heiko.carstens@xxxxxxxxxx>, fthain@xxxxxxxxxxxxxxxxxxx
In-reply-to: <CAMo8BfJ7t-qPWzGPb6JzqEhPm9JBzvAX0a2paBXeQt-RCeHe_w@mail.gmail.com>
References: <74fb6ce22f62e0fb48b91ca9918b74cedbcecaf1.1538096323.git.luto@kernel.org> <alpine.DEB.2.21.1809280819040.8118@nanos.tec.linutronix.de> <CAMuHMdWWxgvo0a+8UvesiVikWS_45yOXRhM39F31Vn17kN+Ptg@mail.gmail.com> <20180928103726.07761672@mschwideX1> <alpine.DEB.2.21.1809281041420.2004@nanos.tec.linutronix.de> <0B38810F-3E22-45A8-9D5D-EDEABD214148@amacapital.net> <20180928165321.0ddaf948@mschwideX1> <CALCETrXm_-YVVw4YQVn8E+hHGAQ6tv+ie8Sfq=h72R5U8=hf-g@mail.gmail.com> <CAMo8BfJ7t-qPWzGPb6JzqEhPm9JBzvAX0a2paBXeQt-RCeHe_w@mail.gmail.com>
User-agent: Alpine 2.21 (DEB 202 2017-01-01)

On Fri, 28 Sep 2018, Max Filippov wrote:

> On Fri, Sep 28, 2018 at 11:02 AM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
> > There may be a much nicer solution.  Unless I missed something, only
> > mips and xtensa even have the possibility of cmpxchg being missing.
> > We could just make those arches supply a futex-detecting helper.
> 
> In case of xtensa availability of cmpxchg is known at build time.

That makes it even simpler. Could you provide a patch which selects
CONFIG_HAVE_FUTEX_CMPXCHG for the right set of CPUs please?

Thanks,

	tglx

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- [PATCH] futex: Set USER_DS for the futex_detect_cmpxchg() test
  - From: Andy Lutomirski
- Re: [PATCH] futex: Set USER_DS for the futex_detect_cmpxchg() test
  - From: Thomas Gleixner
- Re: [PATCH] futex: Set USER_DS for the futex_detect_cmpxchg() test
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- Re: [PATCH] futex: Set USER_DS for the futex_detect_cmpxchg() test
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- Re: [PATCH] futex: Set USER_DS for the futex_detect_cmpxchg() test
  - From: Andy Lutomirski
- Re: [PATCH] futex: Set USER_DS for the futex_detect_cmpxchg() test
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