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Date:	Wed, 2 May 2007 08:23:40 -0700
From:	"Michael Chan" <>
To:	"David Miller" <>,
Subject: Re: [PATCH 3/20][BNX2]: Add 40-bit DMA workaround for 5708.

David Miller wrote:

> From: Jeff Garzik <>
> Date: Wed, 02 May 2007 03:06:43 -0400
> > Second, CONFIG_HIGHMEM is a bad test for IOMMU presence.  I don't
> > think you /can/ test for IOMMU presence.  Maybe DaveM knows a way
> > that I do not?
> You really can't.
> We have platforms that are both IOMMU and non-IOMMU for the same
> configuration, it isn't known until run-time.
A non-IOMMU system using 64-bit dma_addr_t will always set

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