[PATCH v2 4/5] perf config: Initialize perf_config_set with all default configs

[Taeung Song <treeze.taeung@gmail.com>]

To avoid duplicated config variables and
use perf_config_set classifying between standard
perf config variables and unknown or new config
variables other than them, initialize perf_config_set
with all default configs.

And this will be needed when showing all configs with
default value or checking correct type of a config
variable in the near future.

Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
 tools/perf/builtin-config.c | 11 +++++++----
 tools/perf/util/config.c    | 27 ++++++++++++++++++++++-----
 tools/perf/util/config.h    |  6 ++++++
 3 files changed, 35 insertions(+), 9 deletions(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index 2217772..1bc1121 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -35,20 +35,23 @@ static struct option config_options[] = {
 
 static int show_config(struct perf_config_set *perf_configs)
 {
+	bool has_value = false;
 	struct perf_config_item *config;
 	struct list_head *config_list = &perf_configs->config_list;
 
-	if (list_empty(config_list))
-		return -1;
-
 	list_for_each_entry(config, config_list, list) {
 		char *value = config->value;
 
-		if (value)
+		if (value) {
 			printf("%s.%s=%s\n", config->section,
 			       config->name, value);
+			has_value = true;
+		}
 	}
 
+	if (!has_value)
+		return -1;
+
 	return 0;
 }
 
diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index 0b9ba51..5289063 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -647,6 +647,21 @@ out_free:
 	return ret;
 }
 
+static struct perf_config_set *perf_config_set__init(struct perf_config_set *perf_configs)
+{
+	int i;
+	struct list_head *head = &perf_configs->config_list;
+
+	INIT_LIST_HEAD(&perf_configs->config_list);
+
+	for (i = 0; i != CONFIG_END; i++) {
+		struct perf_config_item *config = &default_configs[i];
+
+		list_add_tail(&config->list, head);
+	}
+	return perf_configs;
+}
+
 struct perf_config_set *perf_config_set__new(void)
 {
 	struct perf_config_set *perf_configs = zalloc(sizeof(*perf_configs));
@@ -654,7 +669,7 @@ struct perf_config_set *perf_config_set__new(void)
 	if (!perf_configs)
 		return NULL;
 
-	INIT_LIST_HEAD(&perf_configs->config_list);
+	perf_config_set__init(perf_configs);
 	perf_config(collect_config, &perf_configs->config_list);
 
 	return perf_configs;
@@ -666,10 +681,12 @@ void perf_config_set__delete(struct perf_config_set *perf_configs)
 
 	list_for_each_entry_safe(pos, item, &perf_configs->config_list, list) {
 		list_del(&pos->list);
-		free((char *)pos->section);
-		free((char *)pos->name);
-		free(pos->value);
-		free(pos);
+		if (pos->is_custom) {
+			free((char *)pos->section);
+			free((char *)pos->name);
+			free(pos->value);
+			free(pos);
+		}
 	}
 
 	free(perf_configs);
diff --git a/tools/perf/util/config.h b/tools/perf/util/config.h
index 3c30576..df47420 100644
--- a/tools/perf/util/config.h
+++ b/tools/perf/util/config.h
@@ -14,6 +14,11 @@ enum perf_config_type {
 	CONFIG_TYPE_STRING
 };
 
+/**
+ * struct perf_config_item - element of perf's configs
+ *
+ * @is_custom: unknown or new config other than default config
+ */
 struct perf_config_item {
 	const char *section;
 	const char *name;
@@ -28,6 +33,7 @@ struct perf_config_item {
 		const char *s;
 	} default_value;
 	enum perf_config_type type;
+	bool is_custom;
 	struct list_head list;
 };
 
-- 
2.5.0