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

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Date:	Wed, 12 Dec 2007 23:00:30 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	David Newall <david@...idnewall.com>
Cc:	Rene Herman <rene.herman@...access.nl>,
	Paul Rolland <rol@...917.net>,
	"H. Peter Anvin" <hpa@...or.com>, Krzysztof Halasa <khc@...waw.pl>,
	Pavel Machek <pavel@....cz>, Andi Kleen <andi@...stfloor.org>,
	"David P. Reed" <dpreed@...d.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, rol@...be.net
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64
 with MCP51 laptops

> Yes, it's now clear that all of this is so.  Regrettably, it's used in 
> dozens of drivers, most having nothing to do with an ISA/LPC bus.
> 
> If it really is specific to the ISA architecture, then it should only be 
> used in architecture specific code.

ISA/LPC is not architecture specific. In fact ISA/LPC bus components get
everywhere because the PC market drives the cost per unit for those
components down to nearly nothing.
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