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

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Message-ID: <478543C5.5030401@zytor.com>
Date:	Wed, 09 Jan 2008 13:59:33 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Christer Weinigel <christer@...nigel.se>
CC:	Zachary Amsden <zach@...are.com>,
	Rene Herman <rene.herman@...access.nl>,
	"David P. Reed" <dpreed@...d.com>, Avi Kivity <avi@...ranet.com>,
	Ondrej Zary <linux@...nbow-software.org>,
	Bodo Eggert <7eggert@....de>, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Paul Rolland <rol@...917.net>, Pavel Machek <pavel@....cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	rol <rol@...be.net>
Subject: Re: Re: [PATCH] x86: provide a DMI based port 0x80
 I/O delay override.

Christer Weinigel wrote:
> On Wed, 09 Jan 2008 10:18:11 -0800
> "H. Peter Anvin" <hpa@...or.com> wrote:
> 
>> Zachary Amsden wrote:
>>> I'm speaking specifically in terms of 64-bit platforms here.
>>> Shouldn't we unconditionally drop outb_p doing extra port I/O on
>>> 64-bit architectures?  Especially considering they don't even have
>>> an ISA bus where the decode timing could even matter?
>>>
>> Why should the bitsize of the CPU matter for this?  It seems one of
>> the less meaningful keys for this.
> 
> Well, anything that runs x86_64 should be a fairly modern system.
>  

Yes, but you hardly want a situation where the machine works booting a 
32-bit kernel and not a 64-bit kernel, or vice versa.

Furthermore, it's not so much about "modern" versus "old", it is about 
picking a certain set of bugs.

	-hpa
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