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SubjectRe: [PATCH] Document Linux's memory barriers [try #2]
Jesse Barnes writes:

> It uses a per-node address space to reference the local bridge. The
> local bridge then waits until the remote bridge has acked the write
> before, then sets the outstanding write register to the appropriate
> value.

That sounds like mmiowb can only be used when preemption is disabled,
such as inside a spin-locked region - is that right?

Paul.
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