linux-kernel - Re: [Patch] i386: remove 'usedac' kernel parameter

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Message-Id: <20091209190649I.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 9 Dec 2009 19:07:39 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	amwang@...hat.com
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	gcosta@...hat.com, mingo@...e.hu
Subject: Re: [Patch] i386: remove 'usedac' kernel parameter

On Wed, 9 Dec 2009 01:25:48 -0500
Amerigo Wang <amwang@...hat.com> wrote:

> It is scheduled to be removed.
> 
> Signed-off-by: WANG Cong <amwang@...hat.com>
> Cc: Glauber Costa <gcosta@...hat.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> 
> ---
> diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
> index 591e944..8c895f6 100644
> --- a/Documentation/feature-removal-schedule.txt
> +++ b/Documentation/feature-removal-schedule.txt
> @@ -291,13 +291,6 @@ Who:	Michael Buesch <mb@...sch.de>
>  
>  ---------------------------
>  
> -What:	usedac i386 kernel parameter
> -When:	2.6.27
> -Why:	replaced by allowdac and no dac combination
> -Who:	Glauber Costa <gcosta@...hat.com>
> -
> ----------------------------
> -

I'm not sure about the above description, I'm not against removing
this option though.

IIUC, the usedac option enables us to stop via_no_dac() setting
forbid_dac to 1. That is, someone who uses VIA bridges can use DAC
with this option even if some of VIA bridges seem to be broken about
DAC. I can't see how we can do the same thing with "allowdac" and
"nodac" combination.
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