linux-kernel - Re: [RFC] LKMM: Add volatile

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Message-ID: <20210609202427.GK18427@gate.crashing.org>
Date:   Wed, 9 Jun 2021 15:24:27 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Marco Elver <elver@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Alexander Monakov <amonakov@...ras.ru>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jakub Jelinek <jakub@...hat.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Will Deacon <will@...nel.org>,
        Andrea Parri <parri.andrea@...il.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Nick Piggin <npiggin@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Akira Yokosawa <akiyks@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-toolchains@...r.kernel.org,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [RFC] LKMM: Add volatile_if()

On Wed, Jun 09, 2021 at 10:31:13AM -0700, Nick Desaulniers wrote:
> On Wed, Jun 9, 2021 at 10:20 AM Segher Boessenkool
> <segher@...nel.crashing.org> wrote:
> >
> > On Wed, Jun 09, 2021 at 06:13:00PM +0200, Marco Elver wrote:
> > > On Wed, 9 Jun 2021 at 17:33, Segher Boessenkool
> > > <segher@...nel.crashing.org> wrote:
> > > [...]
> > > > > An alternative design would be to use a statement attribute to only
> > > > > enforce (C) ("__attribute__((mustcontrol))" ?).
> > > >
> > > > Statement attributes only exist for empty statements.  It is unclear how
> > > > (and if!) we could support it for general statements.
> > >
> > > Statement attributes can apply to anything -- Clang has had them apply
> > > to non-empty statements for a while.
> >
> > First off, it is not GCC's problem if LLVM decides to use a GCC
> > extension in some non-compatible way.
> 
> Reminds me of
> https://lore.kernel.org/lkml/CAHk-=whu19Du_rZ-zBtGsXAB-Qo7NtoJjQjd-Sa9OB5u1Cq_Zw@mail.gmail.com/

And my reply to that
https://lore.kernel.org/lkml/20200910154423.GK28786@gate.crashing.org/


Segher