perf maps: Introduce maps__find_symbol_by_name()

Out of map_groups__find_symbol_by_name(), so that we can turn this later
one first into a call to maps__find_symbol_by_name(MAP__FUNCTION) +
MAP__VARIABLE, and then to just one call, we'll merge MAP__FUNCTION with
MAP__VARIABLE maps, to simplify the code.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-pvkar0jacqn92g148u9sqttt@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/map.c

@@ -553,13 +553,9 @@ struct symbol *map_groups__find_symbol(struct map_groups *mg,
 	return NULL;
 }
 
-struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg,
-					       enum map_type type,
-					       const char *name,
-					       struct map **mapp,
-					       symbol_filter_t filter)
+struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name,
+					 struct map **mapp, symbol_filter_t filter)
 {
-	struct maps *maps = &mg->maps[type];
 	struct symbol *sym;
 	struct rb_node *nd;
 
@@ -583,6 +579,17 @@ struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg,
 	return sym;
 }
 
+struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg,
+					       enum map_type type,
+					       const char *name,
+					       struct map **mapp,
+					       symbol_filter_t filter)
+{
+	struct symbol *sym = maps__find_symbol_by_name(&mg->maps[type], name, mapp, filter);
+
+	return sym;
+}
+
 int map_groups__find_ams(struct addr_map_symbol *ams, symbol_filter_t filter)
 {
 	if (ams->addr < ams->map->start || ams->addr >= ams->map->end) {

tools/perf/util/map.h

@@ -190,6 +190,8 @@ void maps__remove(struct maps *maps, struct map *map);
 struct map *maps__find(struct maps *maps, u64 addr);
 struct map *maps__first(struct maps *maps);
 struct map *map__next(struct map *map);
+struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name,
+                                         struct map **mapp, symbol_filter_t filter);
 void map_groups__init(struct map_groups *mg, struct machine *machine);
 void map_groups__exit(struct map_groups *mg);
 int map_groups__clone(struct map_groups *mg,