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:

  * Add support for the new DWARF unwinder library in elfutils (Jiri Olsa)

  * Fix build race in the generation of bison files (Jiri Olsa)

  * Further streamline the feature detection display, trimming it a bit to
    show just the libraries detected, using VF=1 gets a more verbose output,
    showing the less interesting feature checks as well (Jiri Olsa).

  * Check compatible symtab type before loading dso (Namhyung Kim)

  * Check return value of filename__read_debuglink() (Stephane Eranian)

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