linux-kernel - Re: [RFC -mm 1/2] i386/x86

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Message-ID: <46EE9D94.9030608@zytor.com>
Date:	Mon, 17 Sep 2007 08:30:28 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Huang, Ying" <ying.huang@...el.com>
CC:	Andi Kleen <ak@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	akpm@...ux-foundation.org, Yinghai Lu <yhlu.kernel@...il.com>,
	Chandramouli Narayanan <mouli@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC -mm 1/2] i386/x86_64 boot: setup data

Huang, Ying wrote:
> This patch add a field of 64-bit physical pointer to NULL terminated
> single linked list of struct setup_data to real-mode kernel
> header. This is used to define a more extensible boot parameters
> passing mechanism.

You MUST NOT add a field like this without changing the version number,
and, since you expect to enter the kernel at the PM entrypoint, you
better *CHECK* that version number before ever descending down the chain.

	-hpa
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