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From: ebiederm@xmission.com (Eric W. Biederman)
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
       Jeremy Fitzhardinge <jeremy@xensource.com>,
       lkml <linux-kernel@vger.kernel.org>, Chris Wright <chrisw@sous-sol.org>,
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       Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
References: <20070414204154.871250608@goop.org>
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	<200704192304.01053.ak@suse.de> <4627DB0C.2010804@zytor.com>
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	<m1d51vxxm4.fsf@ebiederm.dsl.xmission.com> <462CE027.4030302@goop.org>
	<462CE1E0.9060007@zytor.com>
	<m1zm4zvwfr.fsf@ebiederm.dsl.xmission.com>
	<462CF5B8.4070708@xensource.com>
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Date: Mon, 23 Apr 2007 13:39:41 -0600
In-Reply-To: <462D072F.6030809@goop.org> (Jeremy Fitzhardinge's message of
	"Mon, 23 Apr 2007 12:21:19 -0700")
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Jeremy Fitzhardinge <jeremy@goop.org> writes:

> H. Peter Anvin wrote:
>> It would be *trivial* to make a certain number of page table slots
>> available at the end of the head.S-generated map. 
>
> Or you could use a fixmap.

That certain number of page table slots should be the fixmap slots.
If you do that bt_ioremap works, we remove a boatload of special cases
and the code becomes simpler.

Eric