perf metric: Add add_metric function

Decouple metric adding logging into add_metric function,
so it can be used from other places in following changes.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: Kajol Jain <kjain@linux.ibm.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Clarke <pc@us.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20200719181320.785305-7-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Author: olsajiri

tools/perf/util/metricgroup.c

@@ -625,6 +625,39 @@ static int __metricgroup__add_metric(struct list_head *group_list,
 		    (match_metric(__pe->metric_group, __metric) ||	\
 		     match_metric(__pe->metric_name, __metric)))
 
+static int add_metric(struct list_head *group_list,
+		      struct pmu_event *pe,
+		      bool metric_no_group)
+{
+	int ret = 0;
+
+	pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);
+
+	if (!strstr(pe->metric_expr, "?")) {
+		ret = __metricgroup__add_metric(group_list,
+						pe,
+						metric_no_group,
+						1);
+	} else {
+		int j, count;
+
+		count = arch_get_runtimeparam();
+
+		/* This loop is added to create multiple
+		 * events depend on count value and add
+		 * those events to group_list.
+		 */
+
+		for (j = 0; j < count && !ret; j++) {
+			ret = __metricgroup__add_metric(
+				group_list, pe,
+				metric_no_group, j);
+		}
+	}
+
+	return ret;
+}
+
 static int metricgroup__add_metric(const char *metric, bool metric_no_group,
 				   struct strbuf *events,
 				   struct list_head *group_list,
@@ -636,34 +669,11 @@ static int metricgroup__add_metric(const char *metric, bool metric_no_group,
 	bool has_match = false;
 
 	map_for_each_metric(pe, i, map, metric) {
-		pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);
 		has_match = true;
 
-		if (!strstr(pe->metric_expr, "?")) {
-			ret = __metricgroup__add_metric(group_list,
-							pe,
-							metric_no_group,
-							1);
-			if (ret)
-				return ret;
-		} else {
-			int j, count;
-
-			count = arch_get_runtimeparam();
-
-			/* This loop is added to create multiple
-			 * events depend on count value and add
-			 * those events to group_list.
-			 */
-
-			for (j = 0; j < count; j++) {
-				ret = __metricgroup__add_metric(
-					group_list, pe,
-					metric_no_group, j);
-				if (ret)
-					return ret;
-			}
-		}
+		ret = add_metric(group_list, pe, metric_no_group);
+		if (ret)
+			return ret;
 	}
 
 	/* End of pmu events. */