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: <20071207145430.GA5992@one.firstfloor.org>
Date:	Fri, 7 Dec 2007 15:54:30 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"David P. Reed" <dpreed@...d.com>
Cc:	Andi Kleen <andi@...stfloor.org>, 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

> My machine in question, for example, needs no waiting within CMOS_READs 
> at all.   And I doubt any other chip/device needs waiting that isn't 

I don't know about CMOS, but there were definitely some not too ancient
systems (let's say not more than 10 years) who required IO delays in the
floppy driver and the 8253/8259. But on those the jumps are already
far too fast.

-Andi
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