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From: Chen Gang F T <chen.gang.flying.transformer@gmail.com>
To: Mike Qiu <qiudayu@linux.vnet.ibm.com>
Cc: sfr@canb.auug.org.au, Michael Neuling <mikey@neuling.org>,
	matt@ozlabs.org, Chen Gang <gang.chen@asianux.com>,
	linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v2] PowerPC: kernel: compiling issue, make additional room in exception vector area
Date: Sat, 27 Apr 2013 17:28:45 +0800	[thread overview]
Message-ID: <517B9A4D.1020502@gmail.com> (raw)
In-Reply-To: <5179FA8E.9090501@linux.vnet.ibm.com>

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 �:
>>>>>>>> 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

:-)


Thanks.

-- 
Chen Gang

Flying Transformer

  reply	other threads:[~2013-04-27  9:29 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-04-24  8:22 "attempt to move .org backwards" still show up Mike Qiu
2013-04-24  8:31 ` Michael Ellerman
2013-04-24  8:35   ` Mike Qiu
2013-04-24 10:37     ` Michael Neuling
2013-04-24 12:47       ` Mike
2013-04-25  1:05         ` Chen Gang
2013-04-25  4:05           ` Mike Qiu
2013-04-25  5:36             ` Chen Gang
2013-04-25  7:23               ` Chen Gang
2013-04-25  6:25             ` Paul Mackerras
2013-04-25 11:16               ` Chen Gang
2013-04-26  1:58                 ` Mike Qiu
2013-04-26  2:05                   ` Chen Gang
2013-04-25 11:51               ` [PATCH v2] PowerPC: kernel: compiling issue, make additional room in exception vector area Chen Gang
2013-04-25 11:58                 ` Chen Gang
2013-04-25 23:16                 ` Michael Neuling
2013-04-26  1:06                   ` Chen Gang
2013-04-26  1:18                     ` Chen Gang
2013-04-26  1:36                       ` Chen Gang
2013-04-26  2:03                         ` Mike Qiu
2013-04-26  2:06                           ` Chen Gang
2013-04-26  3:08                             ` Mike Qiu
2013-04-26  3:25                               ` Chen Gang
2013-04-26  3:42                                 ` Chen Gang
2013-04-26  3:54                                   ` Mike Qiu
2013-04-27  9:28                                     ` Chen Gang F T [this message]
2013-04-27  9:32                                       ` Mike Qiu
2013-04-27  9:33                                         ` Chen Gang
2013-04-26  3:19               ` "attempt to move .org backwards" still show up Mike Qiu
2013-04-25  8:18             ` [PATCH] PowerPC: kernel: compiling issue, make additional room in exception vector area Chen Gang
2013-04-25  8:21               ` Chen Gang
2013-04-25  8:24                 ` Mike Qiu
2013-04-25  9:00               ` Michael Neuling
2013-04-25  9:05                 ` Chen Gang
2013-04-25  9:30                   ` Chen Gang
2013-04-24  8:36   ` "attempt to move .org backwards" still show up Mike Qiu

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