linux-kernel - Re: Question about DEC Alpha memory ordering

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20170213203200.GP30506@linux.vnet.ibm.com>
Date:   Mon, 13 Feb 2017 12:32:00 -0800
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Michael Cree <mcree@...on.net.nz>, bob smith <sfmc68@...izon.net>,
        rth@...ddle.net, ink@...assic.park.msu.ru, mattst88@...il.com,
        stern@...land.harvard.edu, j.alglave@....ac.uk,
        luc.maranget@...ia.fr, parri.andrea@...il.com, will.deacon@....com,
        linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Question about DEC Alpha memory ordering

On Tue, Feb 14, 2017 at 08:23:34AM +1300, Michael Cree wrote:
> Hi Paul,
> 
> On Mon, Feb 13, 2017 at 11:09:31AM -0800, Paul E. McKenney wrote:
> > On Mon, Feb 13, 2017 at 01:53:27PM -0500, bob smith wrote:
> > > On 2/13/17 1:39 PM, Paul E. McKenney wrote:
> > > > can real DEC Alpha hardware end up with both instances of "r1"
> > > > having the value 1?
> > > 
> > > I thought this question reminded me of something, so I found this:
> > > > https://www.kernel.org/doc/Documentation/memory-barriers.txt
> > > 
> > > and I pasted in the content - David Howells is one of the authors and
> > > maybe that is why the question sort of reminded me.
> > > 
> > > Maybe someone has an update but this is what was said then.
> > 
> > Well, thank you for pointing me to this, but my question was intended to
> > check whether or not the words I helped to write in memory-barriers.txt
> > are in fact accurate.  So if you have an SMP DEC Alpha system that you
> > could provide remote access to, that would be very helpful!
> 
> I'm that guy with an SMP Alpha system who met you at Linux Conference
> Australia after your talk on memory barriers.  I meant to get back to
> you but tracking down a kernel bug and now a binutils/glibc bug has
> got the better of my time.
> 
> Feel free to email me personally to arrange remote access to an SMP
> Alpha system, preferrably with a GPG signed message.

Would you be willing to extend this offer to Andrea Parri (CCed)?
He is the one who has run such tests in the past.

							Thanx, Paul