linux-kernel - Re: [GIT PULL] locking changes for v4.4

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Message-ID: <20151104135431.GS29027@linux.vnet.ibm.com>
Date:	Wed, 4 Nov 2015 05:54:31 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] locking changes for v4.4

On Wed, Nov 04, 2015 at 12:48:50PM +0100, Ingo Molnar wrote:
> 
> * Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> 
> > On Tue, Nov 3, 2015 at 3:58 PM, Linus Torvalds
> > <torvalds@...ux-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@...nel.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.

							Thanx, Paul

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