Merge tag 'perf-core-for-mingo-4.17-20180220' of...

Merge tag 'perf-core-for-mingo-4.17-20180220' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux

 into perf/core

Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:

- Initial support for linking with python3, by explicitely setting
  the PYTHON Makefile variable, python2 remains supported, more work
  needed to test the shipped python scripts used with 'perf script'
  (Jaroslav Škarvada)

- Make twatch.py, an example python script that sets up evlists and
  evsels to then parse events from mmap, to work with both python2 and
  python3 (Arnaldo Carvalho de Melo)

- Fix setting 'perf ftrace' function filter when using a non-existent
  function, which should result in an error instead of simply not setting
  the filter and showing all functions (Changbin Du)

- Fix paranoid check in machine__set_kernel_mmap(), problem introduced
  in previous perf/core batch (Namhyung Kim)

- Fix reading cpuid model information in s/390, ditto, also introduced
  in the previous perf/core batch (Thomas Richter)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>