Public bug reported:

kprobes are not available on arm64, a useful debug feature available on all 
other supported Ubuntu architectures. I failed to catch this when I reviewed 
the yakkety config because I was just looking for regressions vs. enabling new 
features (arm64/kprobes is new in 4.8).

[Test Case]
sudo perf probe schedule
sudo perf record -e probe:schedule -aR sleep 1

[Regression Risk]
The proposed fix enables a config for an already-upstream feature, so 
regressions will have upstream support. The config change mostly results in 
building new code vs. modifying existing code. The notable exception is that 
arm64's notify_page_fault() will now get code to call kprobe_fault_handler() - 
but only in the case that this newly enabled feature is being used (if 

** Affects: linux (Ubuntu)
     Importance: Medium
     Assignee: dann frazier (dannf)
         Status: In Progress

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  arm64: kprobes disabled

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