Messages in this thread | | | Subject | Re: [PATCH] Define wc_wmb, a write barrier for PCI write combining | From | Jes Sorensen <> | Date | 28 Feb 2006 05:01:29 -0500 |
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>>>>> "Bryan" == Bryan O'Sullivan <bos@pathscale.com> writes:
Bryan> On some platforms, a regular wmb() is not sufficient to Bryan> guarantee that PCI writes have been flushed to the bus if write Bryan> combining is in effect.
Bryan> This change introduces a new macro, wc_wmb(), that makes this Bryan> guarantee.
Bryan,
Could you explain why the current mmiowb() API won't suffice for this? It seems that this is basically trying to achieve the same thing.
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