linux-kernel - Re: [RFC PATCH] tools/memory-model: Remove (dep ; rfi) from ppo

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Date:   Mon, 4 Mar 2019 08:09:47 -0800
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     Akira Yokosawa <akiyks@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        Andrea Parri <andrea.parri@...rulasolutions.com>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Alan Stern <stern@...land.harvard.edu>,
        Will Deacon <will.deacon@....com>,
        Boqun Feng <boqun.feng@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Daniel Lustig <dlustig@...dia.com>
Subject: Re: [RFC PATCH] tools/memory-model: Remove (dep ; rfi) from ppo

On Sun, Mar 03, 2019 at 12:27:12AM +0900, Akira Yokosawa wrote:
> Hello Peter,
> 
> On Tue, 26 Feb 2019 14:49:06 +0100, Peter Zijlstra wrote:
> > On Tue, Feb 26, 2019 at 12:38:13PM +0100, Borislav Petkov wrote:
> >> On Tue, Feb 26, 2019 at 12:30:08PM +0100, Peter Zijlstra wrote:
> >>> When I used the argc variant, gcc-8 'works', but with s/argc/1/ it is
> >>> still broken.
> >>
> >> As requested on IRC:
> > 
> > What I asked was if you could get your GCC developer friends to have a
> > look at this :-)
> 
> JFYI, there is a bugzilla ticket regarding this behavior of GCC
> at https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61502,
> which started on 13 June 2014 and the latest entry was on
> 02 Feb 2019.

And that bug was submitted by none other than Peter Sewell, thank you!

This bug references https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88775,
where someone appears to -want- this sort of optimization.  :-/

							Thanx, Paul