linux-kernel - Re: [PATCH 7 of 13] Make __FIXADDR_TOP variable to allow it to make space for a hypervisor

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Date:	Tue, 1 Aug 2006 14:37:51 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Andrew Morton <akpm@...l.org>
Cc:	Chris Wright <chrisw@...s-sol.org>, jeremy@...source.com,
	linux-kernel@...r.kernel.org, Christian.Limpach@...cam.ac.uk,
	clameter@....com, ebiederm@...ssion.com, kraxel@...e.de,
	hollisb@...ibm.com, ian.pratt@...source.com, rusty@...tcorp.com.au,
	zach@...are.com
Subject: Re: [PATCH 7 of 13] Make __FIXADDR_TOP variable to allow it to make space for a hypervisor

* Andrew Morton (akpm@...l.org) wrote:
> On Tue, 1 Aug 2006 02:03:30 -0700
> Chris Wright <chrisw@...s-sol.org> wrote:
> 
> > * Jeremy Fitzhardinge (jeremy@...source.com) wrote:
> > > -#define MAXMEM			(-__PAGE_OFFSET-__VMALLOC_RESERVE)
> > > +#define MAXMEM			(__FIXADDR_TOP-__PAGE_OFFSET-__VMALLOC_RESERVE)
> > 
> > In the native case we lose one page of lowmem now.
> 
> erm, isn't this the hunk which gave one of my machines a 4kb highmem zone?
> I have memories of reverting it.

Yes, that does sound quite familiar.  I couldn't find the thread, do you
recall any of the details?  I expect it's the same issue as the off by one
page I mentioned above.

thanks,
-chris
-
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