A set of fixes and improvements for the perf subsystem:

 - Kernel fixes:

   - Install cgroup events to the correct CPU context to prevent a
     potential list double add

   - Prevent am intgeer underflow in the perf mlock acounting

   - Add a missing prototyp for arch_perf_update_userpage()

 - Tooling:

   - Add a missing unlock in the error path of maps__insert() in perf maps.

   - Fix the build with the latest libbfd

   - Fix the perf parser so it does not delete parse event terms, which
     caused a regression for using perf with the ARM CoreSight as the sink
     confuguration was missing due to the deletion.

   - Fix the double free in the perf CPU map merging test case

   - Add the missing ustring support for the perf probe command
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Merge tag 'perf-core-for-mingo-5.6-20200201' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent

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

perf maps:

  Cengiz Can:

  - Add missing unlock to maps__insert() error case.

srcline:

  Changbin Du:

  - Make perf able to build with latest libbfd.

perf parse:

  Leo Yan:

  - Keep copy of string in perf_evsel_config_term() to fix sink terms
    processing in ARM CoreSight.

perf test:

  Thomas Richter:

  - Fix test case Merge cpu map, removing extra reference count drop that
    causes a segfault on s/390.

perf probe:

  Thomas Richter:

  - Add ustring support for perf probe command

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