[Crash-utility] trace.so failing to load on newer kernels

[Jeff Moyer]

Hi,

I was trying to use the trace.so extension module, but it was bailing
out early with no explanation.  I tracked it down to the fact that the
system member of the trace_event_call structure no longer exists.  It
was moved up to the class structure.  The change was introduced in this
upstream commit:

commit 8f0820183056ad26dabc0202115848a92f1143fc
Author: Steven Rostedt <srostedt at redhat.com>
Date:   Tue Apr 20 10:47:33 2010 -0400

    tracing: Create class struct for events

I don't have the cycles to fix this up right now, so I was hoping
someone else would.  ;-) Bonus points for printing useful error messages
when the module fails to load for some reason.

Cheers,
Jeff