linux-kernel - Re: [PATCH -next] x86/mm/pat: silence a data race in cpa_4k

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Message-ID: <CANpmjNO7mTEMc6pvpVVXdu2r6cMg_N8QkRffEHHG-WNFXE4CjA@mail.gmail.com>
Date:   Tue, 21 Jan 2020 16:36:49 +0100
From:   Marco Elver <elver@...gle.com>
To:     Qian Cai <cai@....pw>
Cc:     Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] x86/mm/pat: silence a data race in cpa_4k_install

On Tue, 21 Jan 2020 at 16:33, Qian Cai <cai@....pw> wrote:
>
>
>
> > On Jan 21, 2020, at 10:28 AM, Borislav Petkov <bp@...en8.de> wrote:
> >
> > On Tue, Jan 21, 2020 at 04:19:22PM +0100, Marco Elver wrote:
> >> Could you remove the verbatim copy of my email? Maybe something like:
> >>
> >> "Increments to cpa_4k_install may happen concurrently, as detected by KCSAN:
> >>
> >> <....... the stack traces ......>
> >
> > ... and drop the stack traces and fix your subject to say what you're
> > actually "fixing".
>
> Does this title work for you?
>
> x86/mm/pat: silence an data race for KCSAN

Isn't the intent "x86/mm/pat: Mark intentional data race" ?  The fact
that KCSAN no longer shows the warning is a side-effect.  At least
that's how I see it.

Thanks,
-- Marco