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

>>>>> "Bryan" == Bryan O'Sullivan <[email protected]> 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.

Cheers,
Jes
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Follow-Ups:
- Re: [PATCH] Define wc_wmb, a write barrier for PCI write combining
  - From: "Bryan O'Sullivan" <[email protected]>
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  - From: Roland Dreier <[email protected]>

References:
- [PATCH] Define wc_wmb, a write barrier for PCI write combining
  - From: "Bryan O'Sullivan" <[email protected]>

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