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

On Tue, 2006-02-28 at 05:01 -0500, Jes Sorensen wrote:

> 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.

It's a no-op on every arch I care about:

#define mmiowb()

Which makes it useless.  Also, based on the comments in the qla driver,
mmiowb() seems to have inter-CPU ordering semantics that I don't want.
I'm thus hesitant to appropriate it for my needs.

	<b

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Follow-Ups:
- Re: [PATCH] Define wc_wmb, a write barrier for PCI write combining
  - From: Jes Sorensen <[email protected]>
- Re: [PATCH] Define wc_wmb, a write barrier for PCI write combining
  - From: "linux-os \(Dick Johnson\)" <[email protected]>

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

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