Re: [PATCH] percpu-rwsem: use barrier in unlock path

[Alan Cox]

> a later stores, and stores are viewed in program order, so all x86
> stores have "release consistency" modulo the theoretical PPro bugs
> (that I don't think we actually ever saw in practice).

We did seem the for real. The PPro is on its way out however so I hardly
thing we care about optimising for that case.

Alan
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