linux-kernel - Re: [PATCH -tip 1/2] Kconfig: Bump required compiler version of KASAN and UBSAN

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Message-ID: <CAAeHK+y2kfX32TbzcosCLSmr6sMB2BvEfKF8B1_4PrxgjKeLdg@mail.gmail.com>
Date:   Tue, 2 Jun 2020 21:12:32 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip 1/2] Kconfig: Bump required compiler version of KASAN
 and UBSAN

On Tue, Jun 2, 2020 at 9:07 PM Marco Elver <elver@...gle.com> wrote:
>
> On Tue, 2 Jun 2020 at 20:53, Andrey Konovalov <andreyknvl@...gle.com> wrote:
> >
> > On Tue, Jun 2, 2020 at 8:44 PM Marco Elver <elver@...gle.com> wrote:
> > >
> > > Adds config variable CC_HAS_WORKING_NOSANITIZE, which will be true if we
> > > have a compiler that does not fail builds due to no_sanitize functions.
> > > This does not yet mean they work as intended, but for automated
> > > build-tests, this is the minimum requirement.
> > >
> > > For example, we require that __always_inline functions used from
> > > no_sanitize functions do not generate instrumentation. On GCC <= 7 this
> > > fails to build entirely, therefore we make the minimum version GCC 8.
> >
> > Could you also update KASAN docs to mention this requirement? As a
> > separate patch or in v2, up to you.
>
> I can do a v2 tomorrow. But all this is once again tangled up with
> KCSAN, so I was hoping to keep changes minimal. ;-)

OK, we can do a separate patch after all this is merged.