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

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Message-ID: <20200602191936.GE2604@hirez.programming.kicks-ass.net>
Date:   Tue, 2 Jun 2020 21:19:36 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Marco Elver <elver@...gle.com>, Will Deacon <will@...nel.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>,
        Andrey Konovalov <andreyknvl@...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 02, 2020 at 11:57:15AM -0700, Nick Desaulniers wrote:
> On Tue, Jun 2, 2020 at 11:44 AM 'Marco Elver' via Clang Built Linux
> <clang-built-linux@...glegroups.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.
> >
> > For KCSAN this is a non-functional change, however, we should add it in
> > case this variable changes in future.
> >
> > Link: https://lkml.kernel.org/r/20200602175859.GC2604@hirez.programming.kicks-ass.net
> > Suggested-by: Peter Zijlstra <peterz@...radead.org>
> > Signed-off-by: Marco Elver <elver@...gle.com>
> 
> Is this a problem only for x86?  If so, that's quite a jump in minimal
> compiler versions for a feature that I don't think is currently
> problematic for other architectures?  (Based on
> https://lore.kernel.org/lkml/20200529171104.GD706518@hirez.programming.kicks-ass.net/
> )

Currently x86 only, but I know other arch maintainers are planning to
have a hard look at their code based on our findings.