linux-kernel - Re: [PATCH v2 18/18] arm64: select ARCH_SUPPORTS_LTO

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Message-ID: <20171116165922.llrojrvomuihabrt@hirez.programming.kicks-ass.net>
Date:   Thu, 16 Nov 2017 17:59:22 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Will Deacon <will.deacon@....com>,
        Alex Matveev <alxmtvv@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Greg Hackmann <ghackmann@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        linux-arm-kernel@...ts.infradead.org,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Yury Norov <ynorov@...iumnetworks.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH v2 18/18] arm64: select ARCH_SUPPORTS_LTO_CLANG

On Thu, Nov 16, 2017 at 08:50:41AM -0800, Nick Desaulniers wrote:
> On Thu, Nov 16, 2017 at 8:30 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > Ideally we'd get the toolchain people to commit to supporting the kernel
> > memory model along side the C11 one. That would help a ton.
> 
> Does anyone from the kernel side participate in the C standardization process?

Yes, Paul McKenney and Will Deacon. Doesn't mean these two can still be
reconciled though. From what I understand C11 (and onwards) are
incompatible with the kernel model on a number of subtle points.

Not to mention that there's people in the C11 process that strongly
argue for stuff that would break every single multi-threaded program
written since the 70s, which would include pretty much all OS kernels.