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

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Message-ID: <20151104145627.GA2943@gmail.com>
Date:	Wed, 4 Nov 2015 15:56:27 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
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


* Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> 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.

Sounds good to me!

Thanks,

	Ingo
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