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

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Date:	Mon, 14 Dec 2009 15:49:23 +0800
From:	Cong Wang <amwang@...hat.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	gcosta@...hat.com, mingo@...e.hu
Subject: Re: [Patch] i386: remove 'usedac' kernel parameter

FUJITA Tomonori wrote:
> 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.


Hmm, yes, right, I missed this point.

Thanks!
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