linux-kernel - Re: [PATCH v5 00/18] Rework READ

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Message-ID: <CANpmjNOGFqhtDa9wWpXs2kztQsSozbwsuMO5BqqW0c0g0zGfSA@mail.gmail.com>
Date:   Thu, 14 May 2020 17:29:23 +0200
From:   Marco Elver <elver@...gle.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v5 00/18] Rework READ_ONCE() to improve codegen

On Thu, 14 May 2020 at 17:09, Thomas Gleixner <tglx@...utronix.de> wrote:
>
> Peter Zijlstra <peterz@...radead.org> writes:
> > On Thu, May 14, 2020 at 03:35:58PM +0200, Marco Elver wrote:
> >> Any preferences?
> >
> > I suppose DTRT, if we then write the Makefile rule like:
> >
> > KCSAN_SANITIZE := KCSAN_FUNCTION_ATTRIBUTES
> >
> > and set that to either 'y'/'n' depending on the compiler at hand
> > supporting enough magic to make it all work.
> >
> > I suppose all the sanitize stuff is most important for developers and
> > we tend to have the latest compiler versions anyway, right?
>
> Developers and CI/testing stuff. Yes we really should require a sane
> compiler instead of introducing boatloads of horrible workarounds all
> over the place which then break when the code changes slightly.

In which case, let me prepare a series on top of -tip for switching at
least KCSAN to Clang 11. If that's what we'll need, I don't see a
better option right now.

Thanks,
-- Marco