linux-kernel - Re: Bug in herd7 [Was: Re: Litmus test for question from Al Viro]

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Message-ID: <20201008022537.GA480405@rowland.harvard.edu>
Date:   Wed, 7 Oct 2020 22:25:37 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Luc Maranget <luc.maranget@...ia.fr>,
        Akira Yokosawa <akiyks@...il.com>, parri.andrea@...il.com,
        will@...nel.org, peterz@...radead.org, boqun.feng@...il.com,
        npiggin@...il.com, dhowells@...hat.com, j.alglave@....ac.uk,
        dlustig@...dia.com, joel@...lfernandes.org,
        viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: Bug in herd7 [Was: Re: Litmus test for question from Al Viro]

On Wed, Oct 07, 2020 at 03:38:51PM -0700, Paul E. McKenney wrote:
> On Wed, Oct 07, 2020 at 03:40:50PM -0400, Alan Stern wrote:
> > On Wed, Oct 07, 2020 at 10:50:40AM -0700, Paul E. McKenney wrote:
> > > And here is the updated version.
> > > 
> > > 							Thanx, Paul
> > > 
> > > ------------------------------------------------------------------------
> > > 
> > > commit b7cd60d4b41ad56b32b36b978488f509c4f7e228
> > > Author: Alan Stern <stern@...land.harvard.edu>
> > > Date:   Tue Oct 6 09:38:37 2020 -0700
> > > 
> > >     manual/kernel: Add LB+mb+data litmus test
> > 
> > Let's change this to:
> > 
> >       manual/kernel: Add LB data dependency test with no intermediate variable
> > 
> > Without that extra qualification, people reading just the title would
> > wonder why we need a simple LB litmus test in the archive.

> I might get this right sooner or later.  You never know.
> 
> Like this?
> 
> 							Thanx, Paul

Paul, I think you must need new reading glasses.  You completely missed 
the text above.

Alan

> ------------------------------------------------------------------------
> 
> commit 5b6a4ff2c8ad25fc77f4151e71e6cbd8f3268d7b
> Author: Alan Stern <stern@...land.harvard.edu>
> Date:   Tue Oct 6 09:38:37 2020 -0700
> 
>     manual/kernel: Add LB+mb+data litmus test
>     
>     Test whether herd7 can detect a data dependency when there is no
>     intermediate local variable, as in WRITE_ONCE(*x, READ_ONCE(*y)).
>     Commit 0f3f8188a326 in herdtools fixed an oversight which caused such
>     dependencies to be missed.
>     
>     Signed-off-by: Alan Stern <stern@...land.harvard.edu>
>     Signed-off-by: Paul E. McKenney <paulmck@...nel.org>