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From: David Mosberger <davidm@hpl.hp.com>
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Date: Tue, 4 Dec 2001 10:06:04 -0800
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: davidm@hpl.hp.com, tony.luck@intel.com,
        arjanv@redhat.com (Arjan van de Ven), linux-kernel@vger.kernel.org,
        linux-ia64@linuxia64.org, marcelo@conectiva.com.br, davem@redhat.com
Subject: Re: [Linux-ia64] patch to no longer use ia64's software mmu
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>>>>> On Tue, 4 Dec 2001 17:59:28 +0000 (GMT), Alan Cox <alan@lxorguk.ukuu.org.uk> said:

  Alan> ISA DMA. While there is no ISA DMA on ia64 (thankfully) many
  Alan> PCI cards have 26-31 bit limits.
  >>  We could do this if we there was a GFP_4GB zone.  Now that 2.5
  >> is open for business, it won't be long, right?

  Alan> I don't see the need: GFP_DMA is the ISA DMA zone. pci_* API
  Alan> is used by everyone else [for 2.5].

Without a 4GB zone, you may end up creating bounce buffers needlessly
for 32-bit capable DMA devices, no?

	--david
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