From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Mosberger <davidm@napali.hpl.hp.com>
Date: Fri, 24 Oct 2003 22:01:02 +0000
Subject: Re: [PATCH 2.4.23-pre8]  Remove broken prefetching in free_one_pgd()
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To: linux-ia64@vger.kernel.org

>>>>> On Fri, 24 Oct 2003 13:56:31 -0700, "Luck, Tony" <tony.luck@intel.com> said:

  Tony> This patch was accepted into 2.5.55, attributed to "davej@uk".
  Tony> This code will prefetch from beyond the end of the page table
  Tony> being cleared ... which is clearly a bad thing if the page
  Tony> table in question is allocated from the last page of memory
  Tony> (or precedes a hole on a discontig mem system).

Different arches behave differently, though.  In the case of ia64,
it'a always safe to prefetch (even with lfetch.fault).

	--david