linux-kernel - Re: [PATCH] i386: For debugging, make the initial page table setup less forgiving.

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Date:	Fri, 13 Apr 2007 15:18:17 -0700
From:	Zachary Amsden <zach@...are.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i386: For debugging, make the initial page table setup
 less forgiving.

H. Peter Anvin wrote:
> +	/*
> +	 * End condition: we must map up to and including
> +	 * INIT_MAP_BEYOND_END bytes beyond the end of our
> +	 * own page tables; 0x1000 is the size of the page
> +	 * table were about to write, and +0x007 is the
> +	 * attribute bits.
> +	 */
> +	leal (INIT_MAP_BEYOND_END+0x1000+0x007)(%edi),%ebp
>   

hrmm?  Shouldn't that still be INIT_MAP_BEYOND_END+0x0007?  Seems you 
are mapping 4M more than you need.

Zach
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