linux-kernel - Re: [PATCH 2/3] dma: override "dma_flags_set

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Message-ID: <20070821213707.GH5592@sgi.com>
Date:	Tue, 21 Aug 2007 14:37:07 -0700
From:	akepner@....com
To:	Matthew Wilcox <matthew@....cx>
Cc:	Jes Sorensen <jes@....com>,
	linux-kernel <linux-kernel@...r.kernel.org>, rdreier@...co.com,
	linux-ia64 <linux-ia64@...r.kernel.org>
Subject: Re: [PATCH 2/3] dma: override "dma_flags_set_dmaflush" for sn-ia64

On Tue, Aug 21, 2007 at 02:16:32PM -0600, Matthew Wilcox wrote:
> 
> So, let me try to understand ... your hardware allows writes from the
> device to pass other writes from the device?  Doesn't that violate the
> PCI spec?  I'm thinking about this (page 43 of PCI 2.3):
> ....

I should have stated this more carefully, but it's not a PCI reordering 
that's being addressed here, it's a reordering that can occur within 
the NUMA-interconnect. 

-- 
Arthur

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