[Crash-utility] trace.c extension module needs to be updated

[Dave Anderson]

----- Original Message -----
> 
> Hi Daisuke,
> 
> The trace.c extension module is no longer functional as of Linux 4.2
> due to a huge rework of the ftrace code which, most notably, changed
> symbol and structure names from "ftrace..." to "trace...".
> 
> Can you take a look at addressing those changes, while maintaining
> backwards compatibility?
> 
> Thanks,
>   Dave


Hi Daisuke,

I *think* that the attached patch may be enough to handle the kernel changes.  
It uses this construct in the relevant locations to pick the correct version:

  MAX(MEMBER_OFFSET("ftrace_event_call", ...), MEMBER_OFFSET("trace_event_call", ...))  

Note that I also added a gdb_set_crash_scope() call to init_offsets()
because there are multiple, different, "struct ring_buffer" declarations in 
the kernel, and for whatever reason, crash was initially picking up the wrong
one from "kernel/events/internal.h".

Can you verify that this patch is sufficient and test its functionality?
Or if you prefer, can you come up with your own solution?  

Thanks,
  Dave
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