linux-kernel - Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override

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Message-ID: <20071230213114.25139163@the-village.bc.nu>
Date:	Sun, 30 Dec 2007 21:31:14 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	7eggert@....de, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rene Herman <rene.herman@...access.nl>, dpreed@...d.com,
	Islam Amer <pharon@...il.com>, Pavel Machek <pavel@....cz>,
	Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override

On Sun, 30 Dec 2007 12:53:02 -0800
"H. Peter Anvin" <hpa@...or.com> wrote:

> Bodo Eggert wrote:
> > 
> > I've never seen code which would do that, and it was not suggested by any
> > tutorial I ever saw. I'd expect any machine to break on all kinds of software
> > if it required this. The only thing I remember being warned about is writing
> > the index and the data register at the same time using outw, because that
> > would write both registers at the same time on 16-bit-cards.
> > 
> 
> And we use that, and have been for 15 years.  I haven't seen any screams 
> of pain about it.

Actually there were, and I sent numerous people patches for that back in
ISA days. 

Alan
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