From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Mosberger <davidm@napali.hpl.hp.com>
Date: Wed, 16 Feb 2005 21:02:04 +0000
Subject: Re: [rfc] generic allocator and mspec driver
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List-Id: <linux-ia64.vger.kernel.org>
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To: linux-ia64@vger.kernel.org

>>>>> On 16 Feb 2005 14:10:56 -0500, Jes Sorensen <jes@wildopensource.com> said:

  Jes> Hmmm for some reason I had the impression PG_arch_1 was only
  Jes> used on PPC/PPC64 for icache current status, but it looks like
  Jes> you're right. Darn ;-(

  Jes> Can't we just drop swiotlb and tell people to buy real
  Jes> hardware? ;-)))

The use of PG_arch_1 has nothing to do with swiotlb.  It lets us
optimize away expensive cache-flushing by taking advantage of the fact
that DMA transactions automatically establish coherency.

	--david