ftrace, perf: Adding support to use function trace

hi,
here's another version of perf support for function trace
with filter. 

attached patches:
  1/7 ftrace: Change filter/notrace set functions to return exit code
  2/7 ftrace: Add enable/disable ftrace_ops control interface
  3/7 ftrace, perf: Add open/close tracepoint perf registration actions
  4/7 ftrace, perf: Add add/del tracepoint perf registration actions
  5/7 ftrace, perf: Add support to use function tracepoint in perf
  6/7 ftrace, perf: Distinguish ftrace function event field type
  7/7 ftrace, perf: Add filter support for function trace event

v5 changes:
  7/7 - fixed to properly support ',' in filter expressions

v4 changes:
  2/7 - FL_GLOBAL_CONTROL changed to FL_GLOBAL_CONTROL_MASK
      - changed WARN_ON_ONCE() to include the !preempt_count()
      - changed this_cpu_ptr to per_cpu_ptr

  ommited Fix possible NULL dereferencing in __ftrace_hash_rec_update
  (2/8 in v3)

v3 changes:
  3/8 - renamed __add/remove_ftrace_ops
      - fixed preemtp_enable/recursion_clear order in ftrace_ops_control_func 
      - renamed/commented API functions -  enable/disable_ftrace_function
  
  ommited graph tracer workarounf patch 10/10  

v2 changes:
 01/10 - keeping the old fix instead of adding hash_has_contents func
         I'll send separating patchset for this
 02/10 - using different way to avoid the issue (3/9 in v1)
 03/10 - using the way proposed by Steven for controling ftrace_ops
         (4/9 in v1)
 06/10 - added check ensuring the ftrace:function event could be used by
         root only (7/9 in v1)
 08/10 - added more description (8/9 in v1)
 09/10 - changed '&&' operator to '||' which seems more suitable
         in this case (9/9 in v1)

thanks,
jirka
---
 include/linux/ftrace.h             |   47 ++++++++-
 include/linux/ftrace_event.h       |    9 +-
 include/linux/perf_event.h         |    3 +
 kernel/trace/ftrace.c              |  140 +++++++++++++++++++++--
 kernel/trace/trace.h               |   11 ++-
 kernel/trace/trace_event_perf.c    |  214 +++++++++++++++++++++++++++++-------
 kernel/trace/trace_events.c        |   12 ++-
 kernel/trace/trace_events_filter.c |  164 ++++++++++++++++++++++++++-
 kernel/trace/trace_export.c        |   53 ++++++++-
 kernel/trace/trace_kprobe.c        |    8 +-
 kernel/trace/trace_syscalls.c      |   18 +++-
 11 files changed, 598 insertions(+), 81 deletions(-)
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