perf hists: Make hpp setup function generic

Now that we have the 'equal' method implemented for hpp format entries
we can ease up the logic in the following functions and make them
generic wrt comparing format entries:

  perf_hpp__setup_output_field
  perf_hpp__append_sort_keys
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/1453109064-1026-8-git-send-email-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/hist.c

@@ -551,22 +551,12 @@ void perf_hpp__setup_output_field(void)
 
 	/* append sort keys to output field */
 	perf_hpp__for_each_sort_list(fmt) {
-		if (!list_empty(&fmt->list))
-			continue;
-
-		/*
-		 * sort entry fields are dynamically created,
-		 * so they can share a same sort key even though
-		 * the list is empty.
-		 */
-		if (perf_hpp__is_sort_entry(fmt)) {
 		struct perf_hpp_fmt *pos;
 
 		perf_hpp__for_each_format(pos) {
 			if (fmt_equal(fmt, pos))
 				goto next;
 		}
-		}
 
 		perf_hpp__column_register(fmt);
 next:
@@ -580,22 +570,12 @@ void perf_hpp__append_sort_keys(void)
 
 	/* append output fields to sort keys */
 	perf_hpp__for_each_format(fmt) {
-		if (!list_empty(&fmt->sort_list))
-			continue;
-
-		/*
-		 * sort entry fields are dynamically created,
-		 * so they can share a same sort key even though
-		 * the list is empty.
-		 */
-		if (perf_hpp__is_sort_entry(fmt)) {
 		struct perf_hpp_fmt *pos;
 
 		perf_hpp__for_each_sort_list(pos) {
 			if (fmt_equal(fmt, pos))
 				goto next;
 		}
-		}
 
 		perf_hpp__register_sort_field(fmt);
 next: