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

[Mike Qiu]

ä 2013/4/27 17:28, Chen Gang F T åé:
> 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
>
> :-)
yes, I use your patch and it can work, also Paul's patch can work too.
> Thanks.

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