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Date: Wed, 4 Nov 2015 15:56:27 +0100
From: Ingo Molnar <mingo@kernel.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Dmitry Vyukov <dvyukov@google.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [GIT PULL] locking changes for v4.4
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* Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:

> On Wed, Nov 04, 2015 at 12:48:50PM +0100, Ingo Molnar wrote:
> > 
> > * Linus Torvalds <torvalds@linux-foundation.org> wrote:
> > 
> > > On Tue, Nov 3, 2015 at 3:58 PM, Linus Torvalds
> > > <torvalds@linux-foundation.org> wrote:
> > > >
> > > > I think I'll pull this, but then just make a separate commit to remove
> > 
> > Thanks!
> > 
> > > > all the bogus games with "control" dependencies that seem to have no basis is 
> > > > reality.
> > > 
> > > So the attached is what I committed in my tree. [...]
> > 
> > Acked-by: Ingo Molnar <mingo@kernel.org>
> > 
> > > +      dependency into nonexistence.  Careful use of READ_ONCE() or
> > > +      atomic{,64}_read() can help to preserve your control dependency.
> > > +      Please see the Compiler Barrier section for more information.
> > 
> > So technically it's the "COMPILER BARRIER" section, but this is a pre-existing 
> > formulation and the document doesn't use such references consistently so I guess 
> > it doesn't matter much.
> 
> I will take a pass through and fix these up.  I don't see this as urgent,
> so will add it to my patches for the next merge window.

Sounds good to me!

Thanks,

	Ingo