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

From: Ingo Molnar
Date: Wed Nov 04 2015 - 06:48:59 EST

* Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:

> On Tue, Nov 3, 2015 at 3:58 PM, Linus Torvalds
> <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > I think I'll pull this, but then just make a separate commit to remove


> > 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@xxxxxxxxxx>

> + 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.


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