perf/core improvements and fixes
 
 . Align the 'Ok'/'FAILED!' test results in 'perf test.
 
 . Support interrupted syscalls in 'trace'
 
 . Add an event duration column and filter in 'trace'.
 
 . There are references to the man pages in some tools, so try to build
   Documentation when installing, warning the user if that is not possible,
   from Borislav Petkov.
 
 . Give user better message if precise is not supported, from David Ahern.
 
 . Try to find cross-built objdump path by using the session environment
   information in the perf.data file header, from Irina Tirdea, original
   patch and idea by Namhyung Kim.
 
 . Diplays more output on features check for make V=1, so that one can figure
   out what is happening by looking at gcc output, etc. From Jiri Olsa.
 
 . Account the nr_entries in rblist properly, fix by Suzuki K. Poulose.
 
 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Merge tag 'perf-core-for-mingo' 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:

 * Align the 'Ok'/'FAILED!' test results in 'perf test.

 * Support interrupted syscalls in 'trace'

 * Add an event duration column and filter in 'trace'.

 * There are references to the man pages in some tools, so try to build
   Documentation when installing, warning the user if that is not possible,
   from Borislav Petkov.

 * Give user better message if precise is not supported, from David Ahern.

 * Try to find cross-built objdump path by using the session environment
   information in the perf.data file header, from Irina Tirdea, original
   patch and idea by Namhyung Kim.

 * Diplays more output on features check for make V=1, so that one can figure
   out what is happening by looking at gcc output, etc. From Jiri Olsa.

 * Account the nr_entries in rblist properly, fix by Suzuki K. Poulose.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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