From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH 3/20][BNX2]: Add 40-bit DMA workaround for 5708.
Date: Wed, 02 May 2007 00:12:43 -0700 (PDT)
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From: Jeff Garzik <jeff@garzik.org>
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.