From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Thu, 12 Oct 2000 13:10:22 +0200 (CEST)
From: Ingo Molnar <mingo@elte.hu>
Reply-To: mingo@elte.hu
Subject: Re: [RFC] atomic pte updates for x86 smp
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To: "David S. Miller" <davem@redhat.com>
Cc: Linus Torvalds <torvalds@transmeta.com>, blah@kvack.org, "Theodore Y. Ts'o" <tytso@mit.edu>, linux-kernel@vger.kernel.org, MM mailing list <linux-mm@kvack.org>
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On Thu, 12 Oct 2000, Ingo Molnar wrote:

> [...] pgd_clear() should stay a 64-bit operation [...]

even this isnt strictly necessery - pgds and pmds are allocated in 'low
memory', and thus a simple 32-bit write to the lower 32 bits of the pgd
entry is enough to clear a PAE pgd. But it still must be a special case
due to the pgd present-bit restriction.

	Ingo

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