linux-kernel - Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings

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Message-ID: <m1r6qavq0y.fsf@ebiederm.dsl.xmission.com>
Date:	Mon, 23 Apr 2007 13:39:41 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...source.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	virtualization@...ts.osdl.org, Chuck Ebbert <cebbert@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings

Jeremy Fitzhardinge <jeremy@...p.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
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