Add checks to see if ftrace subsystem is disabled#386

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cormander wants to merge 3 commits intodynup:masterfrom cormander:error_handling

+51

Commits on Aug 31, 2014

Add checks to see if ftrace subsystem is disabled
Corey Henderson
committed
Just track a pointer to ftrace_disabled directly
Corey Henderson
committed

Commits on Sep 1, 2014

Also check ftrace_enabled symbol before proceeding
Corey Henderson
committed