[PATCH] fix KDB backtrace for ppc64

[Anton Blanchard]

Hi Ananth,

> Here is a patch that fixes backtracing in KDB for ppc64. We were not 
> handling the link register and were missing an intermediate call 
> during bt.

Have you seen Pauls changes to arch/ppc64/kernel/process.c:show_stack in
ameslab-2.5? It uses a trick to find exception frames and dump them
correctly. I think it would be good to get the same magic into kdb.

Anton
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