[Crash-utility] Fix fatal problems in PPC

[Dave Anderson]

----- Original Message -----
> Hello Dave,
> 
> I'm trying to use crash configured with PPC on linux-2.6.27 powerpc.
> And when crash started with /dev/mem, I found some problems and fixed them.
> 
> I'm afraid that PPC32 is now not maintained for long time, most people use PPC64 only?
> I don't know true reason but if possible, please check attached patch set.

Correct -- there is no "PPC architecture maintainer" w/respect to the crash
utility, and there have been very few architecture-specific patches for 32-bit
ppc in recent years.  

> 
> Report of problems which I met as below:
> [problem 1] Display type mismatch WARNING
>    WARNING: machine type mismatch:
>             crash utility: PPC
>             vmlinux: (unknown)
> -> Simply lacking of verification, remove WARNING with 0001
> 
> [problem 2] Display vmalloc fault WARNING
>    WARNING: cannot access vmalloc'd module memory
> -> PTE index was wrong, fix with 0002
> 
> [problem 3] Repeat "invalid task address in pid_hash:" 500 times
>    crash: invalid task address in pid_hash: c8818450
> -> Alignment check was too old, fix with 0003
> 
> [problem 4] bt command is always SEGV while accessing stack frame
> -> Similar to problem 3, fix with 0004

OK, good -- these 4 patches are queued for crash-6.0.0.
 
> I continue to test the basic command regressions or
> update PPC implementation by learning from PPC64.

Great!  I now designate you as the PPC maintainer!

Thanks,
  Dave