perf hists: Introduce hists__for_each_sort_list macro

With the hist object having the perf_hpp_list we can now iterate sort
format entries based in the hists object. Adding
hists__for_each_sort_list macro to do that.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1453109064-1026-27-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index bc90044..1c7544a 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -264,6 +264,9 @@
 #define hists__for_each_format(hists, format) \
 	perf_hpp_list__for_each_format((hists)->hpp_list, fmt)
 
+#define hists__for_each_sort_list(hists, format) \
+	perf_hpp_list__for_each_sort_list((hists)->hpp_list, fmt)
+
 extern struct perf_hpp_fmt perf_hpp__format[];
 
 enum {