linux-kernel - Re: [PATCH] futex: Set USER_DS for the futex_detect

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Message-ID: <CAMo8BfJ7t-qPWzGPb6JzqEhPm9JBzvAX0a2paBXeQt-RCeHe_w@mail.gmail.com>
Date:   Fri, 28 Sep 2018 13:19:46 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Martin Schwidefsky <schwidefsky@...ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Andrew Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Darren Hart <dvhart@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        fthain@...egraphics.com.au
Subject: Re: [PATCH] futex: Set USER_DS for the futex_detect_cmpxchg() test

On Fri, Sep 28, 2018 at 11:02 AM, Andy Lutomirski <luto@...capital.net> 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.

-- 
Thanks.
-- Max