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: <20071209165908.GA15910@one.firstfloor.org>
Date:	Sun, 9 Dec 2007 17:59:08 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

> I mean, we expect 8usec delay -- historical ISA timing -- but when
> _PCI_ card with leds is inserted, it is likely to be faster than old
> ISA, right?

Yes, i guess switching to udelay at least on newer systems would
be a good idea.  I'm not quite sure about systems without TSC though.

-Andi
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