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    SubjectRe: [PATCH] Define wc_wmb, a write barrier for PCI write combining
    FromBryan O'Sullivan <>
    DateTue, 28 Feb 2006 09:57:55 -0800
    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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