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

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Message-ID: <20151104114850.GA30862@gmail.com>
Date:	Wed, 4 Nov 2015 12:48:50 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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>,
	"Paul E. McKenney" <paulmck@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] locking changes for v4.4


* 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.

Thanks,

	Ingo
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