linux-kernel - Re: [PATCH 12/43] kcsan: clang: retire CONFIG_KCSAN_KCOV

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Date:   Wed, 15 Dec 2021 14:43:25 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Marco Elver <elver@...gle.com>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Christoph Hellwig <hch@....de>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Ingo Molnar <mingo@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Kees Cook <keescook@...omium.org>,
        Matthew Wilcox <willy@...radead.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Pekka Enberg <penberg@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/43] kcsan: clang: retire CONFIG_KCSAN_KCOV_BROKEN

On Wed, Dec 15, 2021 at 02:39:43PM +0100, Marco Elver wrote:
> On Wed, 15 Dec 2021 at 14:33, Mark Rutland <mark.rutland@....com> wrote:
> >
> > On Tue, Dec 14, 2021 at 05:20:19PM +0100, Alexander Potapenko wrote:
> > > kcov used to be broken prior to Clang 11, but right now that version is
> > > already the minimum required to build with KCSAN, that is why we don't
> > > need KCSAN_KCOV_BROKEN anymore.
> >
> > Just to check, how is that requirement enforced?
> 
> HAVE_KCSAN_COMPILER will only be true with Clang 11 or later, due to
> no prior compiler having "-tsan-distinguish-volatile=1".

I see -- could we add wording to that effect into the commit messge?

> > I see the core Makefiles enforce 10.0.1+, but I couldn't spot an explicit
> > version dependency in Kconfig.kcsan.
> >
> > Otherwise, this looks good to me!
> 
> I think 5.17 will be Clang 11 only, so we could actually revert
> ea91a1d45d19469001a4955583187b0d75915759:
> https://lkml.kernel.org/r/Yao86FeC2ybOobLO@archlinux-ax161
> 
> I should resend that to be added to the -kbuild tree.

FWIW, that also works for me.

Thanks,
Mark.