linux-kernel - Re: [PATCH]Fix broken VMI in 2.6.27-rc..

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Date:	Thu, 07 Aug 2008 17:23:36 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...nel.org>
CC:	Zachary Amsden <zach@...are.com>,
	Alok Kataria <akataria@...are.com>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH]Fix broken VMI in 2.6.27-rc..

H. Peter Anvin wrote:
>> Having fixmaps at link-time fixed addresses would be nice, I suppose, 
>> but hardly worth going to vast effort over.
>>
>
> No, but it's hardly vast effort, either.

Well, off you go.

> Yes, and we should add a symbol for the bottom of the 1:1 area as well 
> (to disambiguate it from TASK_SIZE).
>

Well, that's already called "PAGE_OFFSET".  64-bit needs to be careful 
about the distinction anyway, because there's the sign extension hole 
between user and kernel space.  Xen squeezes itself in just above the 
hole, so I moved PAGE_OFFSET up accordingly.

    J
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