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Message-ID: <47667B62.5080508@gmail.com>
Date: Mon, 17 Dec 2007 14:36:34 +0100
From: Rene Herman <rene.herman@gmail.com>
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To: "David P. Reed" <dpreed@reed.com>
CC: Ingo Molnar <mingo@elte.hu>, "H. Peter Anvin" <hpa@zytor.com>,
       Paul Rolland <rol@as2917.net>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Pavel Machek <pavel@ucw.cz>, Thomas Gleixner <tglx@linutronix.de>,
       linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
       rol@witbe.net
Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
References: <20071215080831.404cdb32@tux.DEF.witbe.net> <47638C8C.2090604@gmail.com> <476438B4.2020600@zytor.com> <476462BE.3030701@gmail.com> <4764687D.6080609@zytor.com> <476524DB.7020806@gmail.com> <20071216152250.GA21245@elte.hu> <4765D43E.1010800@gmail.com> <20071217105744.GA14315@elte.hu> <4766684D.40202@gmail.com> <20071217130933.GB27992@elte.hu> <47667812.8050708@gmail.com> <47667A85.3080100@reed.com>
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On 17-12-07 14:32, David P. Reed wrote:

> Rene Herman wrote:
>> No, most definitely not. Having the user select udelay or none through 
>> the kernel config and then the kernel deciding "ah, you know what, 
>> I'll know better and use port access anyway" is _utterly_ broken 
>> behaviour. Software needs to listen to its master.
>>
> When acting as an ordinary user, the .config is beyond my control 
> (except on Gentoo).   It is in control of the distro (Fedora, Ubuntu, 
> ... but perhaps not Gentoo).  I think the distro guys want a default 
> behavior that is set in .config, with quirk overrides being done when 
> needed.   And of course the user in his/her boot params gets the final say.

Yes, and when the user/distributor specifically selected udelay or none as 
an I/O delay method it makes no sense whatsoever to have the kernel override 
that again -- the DMI hack only fixes something for the default case, when 
_no_ specific choice had been made (which the current setup can't express 
but mine did).

I feel particularly strongly (always) about that "listen to its master" bit. 
The kernel does not know better then whomever configured it, even when it does.

Rene.


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