linux-kernel - Re: [PATCH 1/2] Use structs instead of hardcoded offsets in x86 boot decompressor.

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Message-ID: <20080525000330.3eedd788@riellaptop.surriel.com>
Date:	Sun, 25 May 2008 00:03:30 -0400
From:	Rik van Riel <riel@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Kristian Høgsberg <krh@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Use structs instead of hardcoded offsets in x86
 boot decompressor.

On Fri, 23 May 2008 23:17:01 -0700
"H. Peter Anvin" <hpa@...or.com> wrote:

> Uhm... except it doesn't live at address zero, at all.
> 
> It's called "zeropage" because we used to recycle it into 
> empty_zero_page, a long long time ago.
> 
> The bootparms structure is pointed to by %esi being passed from the 
> setup code to the decompressor to the kernel.

Then why does dereferencing the uninitialized
pointer work, both in the code before and after
the patch?

What am I misssing?
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