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

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Message-ID: <475EBFBA.6090301@keyaccess.nl>
Date:	Tue, 11 Dec 2007 17:50:02 +0100
From:	Rene Herman <rene.herman@...access.nl>
To:	Andi Kleen <andi@...stfloor.org>
CC:	"linux-os (Dick Johnson)" <linux-os@...logic.com>,
	David Newall <david@...idnewall.com>,
	Paul Rolland <rol@...917.net>,
	"H. Peter Anvin" <hpa@...or.com>, Krzysztof Halasa <khc@...waw.pl>,
	Pavel Machek <pavel@....cz>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"David P. Reed" <dpreed@...d.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, rol@...be.net, dpreed@...d.com
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64
 with MCP51 laptops

On 11-12-07 17:30, Andi Kleen wrote:

> Anyways it looks like the discussion here is going in a
> a loop. I had hoped David would post his test results with
> another port so that we know for sure that the bus aborts 
> (and not port 80) is the problem on his box. But it looks like
> he doesn't want to do this. Still removing the bus aborts
> is probably the correct way to go forward.

Yes, I do also still want to know that. David (Reed)?

> Only needs a patch now. If nobody beats me to it i'll
> add one later to my tree.

Pavel Machek already posted one. His udelay(8) wants to be less -- 1 or "to 
be safe" perhaps 2.

http://lkml.org/lkml/2007/12/9/131

Rene.
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