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Commit21e6d84286("perf diff: Use perf_hpp__register_sort_field interface") changed list_add() to perf_hpp__register_sort_field(). This resulted in a behavior change since the field was added to the tail instead of the head. So the -o option is mostly ignored due to its order in the list. This patch fixes it by adding perf_hpp__prepend_sort_field(). Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Fixes:21e6d84286("perf diff: Use perf_hpp__register_sort_field interface") Link: http://lkml.kernel.org/r/20170118051457.30946-2-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>