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

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

 * Improve warning message when libunwind devel packages not present, from Jiri Olsa

 * Remove perf_event_attr needless version inflation, from Jiri Olsa

 * Introduce libtraceevent strerror like error reporting facility, from Namhyung Kim

 * Add pmu mappings to perf.data header and use event names from cmd line, from Robert Richter

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