Re: [PATCH] Define wc_wmb, a write barrier for PCI write combining

[Bryan O'Sullivan]

On Sat, 2006-02-25 at 09:28 -0500, Benjamin LaHaise wrote:

> sfence has no impact 
> on the flushing of the write combining buffers

The sfence instruction guarantees that every store that precedes it in
program order is globally visible, including over the likes of the PCI
bus, before any store instruction that follows the fence.

	<b

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