[cxx-mem-model] disallow load data races (1 of some)

[Jakub Jelinek]

On Fri, Mar 25, 2011 at 09:30:22AM -0600, Jeff Law wrote:
> I'm not going to chime in on this specific problem; however, it is worth
> noting that many of the issues raised by the C++0x memory model also
> affect the linux kernel.

But what they are seeing are certainly store data races, not load races,
because no hw they care about (or no hw at all?) detects the latter.
Having options to avoid store data races is useful not just for C++0x memory
model compliance and Linux kernel, but e.g. for OpenMP too.

> In fact, it was the realization that the kernel guys are fighting
> closely related issues with data races that bumped the priority of the
> memory model work to a level that we (Red Hat) felt it was necessary to
> start pushing these issues upstream now.

	Jakub