On Tue, Mar 07, 2006 at 05:36:59PM +0000, David Howells wrote:
> David Howells <[email protected]> wrote:
>
> > I suspect, then, that x86_64 should not have an SFENCE for smp_wmb(), and
> > that only io_wmb() should have that.
>
> Hmmm... We don't actually have io_wmb()... Should the following be added to
> all archs?
>
> io_mb()
> io_rmb()
> io_wmb()
it's spelled mmiowb(), and reads from IO space are synchronous, so don't
need barriers.
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