linux-kernel - Re: [PATCH v2] PowerPC: kernel: compiling issue, make additional room in exception vector area

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Date:	Sat, 27 Apr 2013 17:32:27 +0800
From:	Mike Qiu <qiudayu@...ux.vnet.ibm.com>
To:	Chen Gang F T <chen.gang.flying.transformer@...il.com>
CC:	Chen Gang <gang.chen@...anux.com>,
	Michael Neuling <mikey@...ling.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <michael@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org, sfr@...b.auug.org.au,
	matt@...abs.org, linux-kernel@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2] PowerPC: kernel: compiling issue, make additional
 room in exception vector area

于 2013/4/27 17:28, Chen Gang F T 写道:
> On 2013年04月26日 11:54, Mike Qiu wrote:
>> 于 2013/4/26 11:42, Chen Gang 写道:
>>> On 2013年04月26日 11:25, Chen Gang wrote:
>>>> On 2013年04月26日 11:08, Mike Qiu wrote:
>>>>> 于 2013/4/26 10:06, Chen Gang 写道:
>>>>>> On 2013年04月26日 10:03, Mike Qiu wrote:
>>>>>>> �� 2013/4/26 9:36, Chen Gang д��:
>>>>>>>>> On 2013��04��26�� 09:18, Chen Gang wrote:
>>>>>>>>>>> On 2013��04��26�� 09:06, Chen Gang wrote:
>>>>>>>>>>>>>>> CFAR is the Come From Register.  It saves the location of the
>>>>>>>>>>>>>>> last
>>>>>>>>>>>>>>>>> branch and is hence overwritten by any branch.
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>> Do we process it just like others done (e.g. 0x300, 0xe00,
>>>>>>>>>>>>> 0xe20 ...) ?
>>>>>>>>>>>>>       . = 0x900
>>>>>>>>>>>>>       .globl decrementer_pSeries
>>>>>>>>>>>>> decrementer_pSeries:
>>>>>>>>>>>>>         HMT_MEDIUM_PPR_DISCARD
>>>>>>>>>>>>>       SET_SCRATCH0(r13)
>>>>>>>>>>>>>       b decrementer_pSeries_0
>>>>>>>>>>>>>
>>>>>>>>>>>>>       ...
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>> Oh, it seems EXCEPTION_PROLOG_1 will save the regesters which
>>>>>>>>> related
>>>>>>>>> with CFAR, so I think need move EXCEPTION_PROLOG_1 to near 0x900.
>>>>>>> I will try your diff V2, to see if the machine can boot up
>>>>>> OK, thanks. (hope it can work)
>>>>> It seems that the machine can be bootup in powernv mode, but I'm not
>>>>> sure if my machine call that module.
>>>>>
>>>>> At lease my machine can boot up
>>> Please reference commit number: 1707dd161349e6c54170c88d94fed012e3d224e3
>>> (1707dd1 powerpc: Save CFAR before branching in interrupt entry paths)
>>>
>>> What our diff v2 has done is just the fix for our patch v2 (just like
>>> the commit 1707dd1 has done).
>>>
>>> Please check, thanks.
>>>
>>> :-)
>> I will check this evening or tomorrow, I have something else to do this
>> afteroon.
> I think the diff v2 is correct, but is not the best one for this issue.
>
> I prefer the Paul's patch for this issue which has better performance
>
> :-)
yes, I use your patch and it can work, also Paul's patch can work too.
>
> Thanks.
>

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