linux-kernel - Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

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Date:	Fri, 07 Dec 2007 11:49:08 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Rene Herman <rene.herman@...access.nl>
Cc:	Robert Hancock <hancockr@...w.ca>,
	"David P. Reed" <dpreed@...d.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

Rene Herman <rene.herman@...access.nl> writes:
>
> If there are no sensible fixes, an 0x80/0xed choice could I assume be
> hung of DMI or something (if that _is_ parsed soon enough).

Another possibility would be to key this off DMI year (or existence
of DMI year since old systems don't have it). I guess it would
be reasonable to not do any delays on anything modern.

On x86-64 it could be presumably always disabled too, although
I was always too chicken to do that.

-Andi
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