linux-kernel - Re: [patch 5/5] i8253: Cleanup outb/inb magic

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Date:	Thu, 09 Jun 2011 07:41:00 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Ingo Molnar <mingo@...e.hu>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: [patch 5/5] i8253: Cleanup outb/inb magic

On 06/09/2011 06:34 AM, Ralf Baechle wrote:
> On Thu, Jun 09, 2011 at 01:08:30PM -0000, Thomas Gleixner wrote:
> 
>> Remove the hysterical outb/inb_pit defines and use outb_p/inb_p in the
>> code.
> 
> FWIW, I've traced the use of inb_p and outb_p to access the PIT timer
> all the way back to Linux 0.10
> 
> I wonder if any of the systems affected actually has enough memory to boot
> a modern kernel or if the _p versions have become useless bagagge that
> should be dropped - cleanup which would then also allow more code to the
> iomap() API.
> 
> I'm interested because quite a few MIPS systems have been built based on
> Intel, OPTi and other chipsets which may or may not have been affected.
> 

On the x86 side, we already have configurability of the delay in
inb_p/outb_p... one option could be null delay.

	-hpa

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