Re: [PATCH v2] PowerPC: kernel: compiling issue, make additionalroom in exception vector area

[Chen Gang F T]

On 2013å04æ26æ 11:54, Mike Qiu wrote:
> ä 2013/4/26 11:42, Chen Gang åé:
>> On 2013å04æ26æ 11:25, Chen Gang wrote:
>>> On 2013å04æ26æ 11:08, Mike Qiu wrote:
>>>> ä 2013/4/26 10:06, Chen Gang åé:
>>>>> On 2013å04æ26æ 10:03, Mike Qiu wrote:
>>>>>> ïï 2013/4/26 9:36, Chen Gang Ðïï:
>>>>>>>> On 2013ïï04ïï26ïï 09:18, Chen Gang wrote:
>>>>>>>>>> On 2013ïï04ïï26ïï 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

:-)


Thanks.

-- 
Chen Gang

Flying Transformer
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