perf probe: Unify show_available_functions for uprobes/kprobes

Unify show_available_functions for uprobes/kprobes to cleanup and reduce
the code. This also improves error messages.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: "David A. Long" <dave.long@linaro.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: yrl.pp-manager.tt@hitachi.com
Link: http://lkml.kernel.org/r/20140206053211.29635.20563.stgit@kbuild-fedora.yrl.intra.hitachi.co.jp
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/probe-event.c

@@ -2323,66 +2323,46 @@ static int filter_available_functions(struct map *map __maybe_unused,
 	return 1;
 }
 
-static int __show_available_funcs(struct map *map)
-{
-	if (map__load(map, filter_available_functions)) {
-		pr_err("Failed to load map.\n");
-		return -EINVAL;
-	}
-	if (!dso__sorted_by_name(map->dso, map->type))
-		dso__sort_by_name(map->dso, map->type);
-
-	dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
-	return 0;
-}
-
-static int available_kernel_funcs(const char *module)
+int show_available_funcs(const char *target, struct strfilter *_filter,
+					bool user)
 {
 	struct map *map;
 	int ret;
 
-	ret = init_symbol_maps(false);
+	ret = init_symbol_maps(user);
 	if (ret < 0)
 		return ret;
 
-	map = kernel_get_module_map(module);
+	/* Get a symbol map */
+	if (user)
+		map = dso__new_map(target);
+	else
+		map = kernel_get_module_map(target);
 	if (!map) {
-		pr_err("Failed to find %s map.\n", (module) ? : "kernel");
+		pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
 		return -EINVAL;
 	}
-	ret = __show_available_funcs(map);
-	exit_symbol_maps();
-
-	return ret;
-}
-
-static int available_user_funcs(const char *target)
-{
-	struct map *map;
-	int ret;
 
-	ret = init_symbol_maps(true);
-	if (ret < 0)
-		return ret;
-
-	map = dso__new_map(target);
-	ret = __show_available_funcs(map);
-	dso__delete(map->dso);
-	map__delete(map);
-	exit_symbol_maps();
-	return ret;
-}
-
-int show_available_funcs(const char *target, struct strfilter *_filter,
-					bool user)
-{
-	setup_pager();
+	/* Load symbols with given filter */
 	available_func_filter = _filter;
+	if (map__load(map, filter_available_functions)) {
+		pr_err("Failed to load symbols in %s\n", (target) ? : "kernel");
+		goto end;
+	}
+	if (!dso__sorted_by_name(map->dso, map->type))
+		dso__sort_by_name(map->dso, map->type);
 
-	if (!user)
-		return available_kernel_funcs(target);
+	/* Show all (filtered) symbols */
+	setup_pager();
+	dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
+end:
+	if (user) {
+		dso__delete(map->dso);
+		map__delete(map);
+	}
+	exit_symbol_maps();
 
-	return available_user_funcs(target);
+	return ret;
 }
 
 /*