help with porting perf lkm to later kernel

[Chris Freehill <cfreehill@gmail.com>]

Hello,

I am trying to get my linux kernel module that extends perf support to
work in a later kernel version. The lkm had been working in 3.0.51.

In the new target kernel to which I am trying to port, 3.8.13, I get
warnings at the modpost stage complaining about symbols that can no
longer be found. If I attempt to load that module, I get errors saying
the same thing (those symbols can't be found).

The symbols that can't be found are

".perf_pmu_enable"
".perf_event_update_userpage"
".perf_pmu_disable"
".perf_event_overflow"
".perf_pmu_unregister"
".perf_pmu_register"

Does anyone have any tips or advice as to how code that calls these
previously working functions should now be handled when built against
later kernels?

Chris