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

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Date:	Wed, 2 Jan 2008 11:00:41 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Christer Weinigel <christer@...nigel.se>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"David P. Reed" <dpreed@...d.com>,
	Rene Herman <rene.herman@...il.com>,
	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@...be.net
Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.


* H. Peter Anvin <hpa@...or.com> wrote:

> Christer Weinigel wrote:
>>
>> out 80h, al is only two bytes.  Any alternative that has been suggested
>> in this discussion will use more space.  mov dx, alt_port; out dx, al
>> will be larger, a function call will definitely be a lot larger. People
>> have been making changes to the kernel to save a couple of hundred
>> bytes of text size.
>>
>
> If text size becomes a problem in this case, then we can use an 
> alternatives-like mechanism to fix up the kernel.  However, 
> realistically this probably should be a function call *combined with* 
> the out and in; that reduces the impact somewhat.

and that's exactly what x86.git#mm does now.

	Ingo
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