linux-kernel - Re: [PATCH] x86/boot: clear rsdp address in boot

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Date:   Mon, 3 Dec 2018 21:49:22 -0800
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org
Cc:     sstabellini@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de
Subject: Re: [PATCH] x86/boot: clear rsdp address in boot_params for broken
 loaders

On 12/3/18 9:32 PM, Juergen Gross wrote:
> 
> I'd like to send a followup patch doing that. And I'd like to not only
> test sentinel for being non-zero, but all padding fields as well. This
> should be 4.21 material, though.
> 

No, you can't do that.  That breaks backwards compatibility.

	-hpa