linux-kernel - Re: [PATCH 18/18] arm64: lto: Strengthen READ_ONCE() to acquire when CLANG

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Date:   Wed, 8 Jul 2020 11:20:36 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Dave Martin <Dave.Martin@....com>,
        Will Deacon <will@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        Alan Stern <stern@...land.harvard.edu>,
        Matt Turner <mattst88@...il.com>,
        kernel-team <kernel-team@...roid.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        Boqun Feng <boqun.feng@...il.com>,
        Josh Triplett <josh@...htriplett.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Richard Henderson <rth@...ddle.net>,
        LKML <linux-kernel@...r.kernel.org>, linux-alpha@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 18/18] arm64: lto: Strengthen READ_ONCE() to acquire when
 CLANG_LTO=y

On Wed, Jul 08, 2020 at 11:16:20AM +0200, Peter Zijlstra wrote:
> On Tue, Jul 07, 2020 at 04:01:28PM -0700, Nick Desaulniers wrote:
> > I'm trying to put together a Micro Conference for Linux Plumbers
> > conference focused on "make LLVM slightly less shitty."  Do you all
> > plan on attending the conference? Would it be worthwhile to hold a
> > session focused on discussing this (LTO and memory models) be
> > worthwhile?
> 
> I'd love to have a session about compilers and memory ordering with both
> GCC and CLANG in attendance.
> 
> We need a solution for dependent-loads and control-dependencies for both
> toolchains.

What Peter said!  ;-)

							Thanx, Paul