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

[Cong Wang <amwang@redhat.com>]

FUJITA Tomonori wrote:
> On Wed, 9 Dec 2009 01:25:48 -0500
> Amerigo Wang <amwang@redhat.com> wrote:
> 
>> It is scheduled to be removed.
>>
>> Signed-off-by: WANG Cong <amwang@redhat.com>
>> Cc: Glauber Costa <gcosta@redhat.com>
>> Cc: Ingo Molnar <mingo@elte.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@bu3sch.de>
>>  
>>  ---------------------------
>>  
>> -What:	usedac i386 kernel parameter
>> -When:	2.6.27
>> -Why:	replaced by allowdac and no dac combination
>> -Who:	Glauber Costa <gcosta@redhat.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!