Quoting r. Roland Dreier <[EMAIL PROTECTED]>:
> Subject: Re: [PATCH (updated)] ipoib: dont lock tx on completion
>
> Michael> Can they be moved to before the wmb? I think not.
>
> Why not? All wmb() does is guarantee that stores issued before the
> wmb() will complete before stores issued after the wmb(). It doesn't
> even say anything about when the stores have to complete, let alone
> the order of loads. The most obvious definition is for sparc64, where
> we have
>
> #define wmb() membar("#StoreStore")
>
> which my Sparc reference manual says only means
>
> Forces all stores after the MEMBAR to wait until all stores before
> the MEMBAR have reached global visibility.
>
> ppc is similar, where wmb() is just "eieio."
>
> - R.
>
OK, so means we must make them both mb(). Sigh.
--
MST - Michael S. Tsirkin
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