linux-kernel - Re: [PATCH 1/3] x86: fix init_8259A() to not use outb

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Message-ID: <47B8EDDA.4080801@keyaccess.nl>
Date:	Mon, 18 Feb 2008 03:30:50 +0100
From:	Rene Herman <rene.herman@...access.nl>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	"David P. Reed" <dpreed@...d.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] x86: fix init_8259A() to not use outb_pic

On 17-02-08 23:25, Alan Cox wrote:

> On Sun, 17 Feb 2008 16:56:28 -0500 (EST)
> "David P. Reed" <dpreed@...d.com> wrote:
> 
>> fix init_8259A() which initializes the 8259 PIC to not use outb_pic,
>> which is a renamed version of outb_p, and delete outb_pic define.
> 
> NAK
> 
> The entire point of inb_pic/outb_pic is to isolate the various methods
> and keep the logic for delays in one place. Undoing this just creates a
> nasty mess.
> 
> Quite probably inb_pic/outb_pic will end up as static inlines that do inb
> or outb with a udelay of 1 or 2 but that is where the knowledge belongs.

Additional NAK in sofar that the PIC delays were reported to be necesary 
with some VIA chipsets earlier in these threads.

Rene.
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