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Instead of passing the tree root, get it from a method that can be implemented in any derived class. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: https://lkml.kernel.org/n/tip-ovcv28bg4mt9swk36ypdyz14@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>