linux-kernel - Re: memory barrier question

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Date:	Wed, 22 Sep 2010 11:41:44 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Michael Cree <mcree@...on.net.nz>
Cc:	Miklos Szeredi <miklos@...redi.hu>,
	James.Bottomley@...senPartnership.com, benh@...nel.crashing.org,
	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: memory barrier question

On Tue, Sep 21, 2010 at 07:59:10AM -0700, Paul E. McKenney wrote:
> On Mon, Sep 20, 2010 at 01:40:55PM -0700, Paul E. McKenney wrote:
> > On Tue, Sep 21, 2010 at 08:26:14AM +1200, Michael Cree wrote:
> > > On 21/09/10 06:25, Paul E. McKenney wrote:
> > > >But do we really care about Alpha anymore?  (I can see it now... The
> > > >Alpha portion of the kernel tree moves to staging...)
> > > 
> > > I do.
> > > 
> > > Sent from my Compaq Alpha XP1000 :-)
> > 
> > In that case, an smp_read_barrier_depends() or rcu_dereference() is
> > also required...
> 
> Wait a minute...  I finally got a chance to look up the system.  This
> system has only a single Alpha CPU, right?
> 
> If so, just build a UP kernel and be happy.  No need to worry about
> any of these SMP issues.
> 
> So, an alternative proposal -- support only UP kernels on Alpha.  ;-)

And there do seem to be some SMP Alpha systems still in use:

	http://www.alphalinux.org/wiki/index.php/User:Armin76/HW_list

							Thanx, Paul
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