[PATCH v4 4/4] perf config: Initialize perf_config_set with all default configs

[Taeung Song]

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@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Taeung Song <treeze.taeung@xxxxxxxxx>
---
 tools/perf/builtin-config.c | 11 +++++++----
 tools/perf/util/config.c    | 40 ++++++++++++++++++++++++++++++++++------
 tools/perf/util/config.h    |  7 +++++++
 3 files changed, 48 insertions(+), 10 deletions(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index c7cf34f..9e2adad 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -35,23 +35,26 @@ static struct option config_options[] = {
 
 static int show_config(struct perf_config_set *perf_configs)
 {
+	bool has_value = false;
 	struct perf_config_section *section;
 	struct perf_config_item *config_item;
 	struct list_head *sections = &perf_configs->sections;
 
-	if (list_empty(sections))
-		return -1;
-
 	list_for_each_entry(section, sections, list) {
 		list_for_each_entry(config_item, &section->config_items, list) {
 			char *value = config_item->value;
 
-			if (value)
+			if (value) {
 				printf("%s.%s=%s\n", section->name,
 				       config_item->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 df9f0dd..2cfafff 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -678,6 +678,7 @@ static struct perf_config_item *add_config_item(struct perf_config_section *sect
 	if (!config_item)
 		return NULL;
 
+	config_item->is_custom = true;
 	config_item->name = strdup(name);
 	if (!name) {
 		pr_err("%s: strdup failed\n", __func__);
@@ -748,6 +749,29 @@ out_free:
 	return -1;
 }
 
+static struct perf_config_set *perf_config_set__init(struct perf_config_set *perf_configs)
+{
+	int i, j;
+	struct perf_config_section *section;
+	struct perf_config_item *config_items;
+	struct list_head *sections = &perf_configs->sections;
+
+	INIT_LIST_HEAD(&perf_configs->sections);
+
+	for (i = 0; i != CONFIG_END; i++) {
+		section = &default_sections[i];
+		INIT_LIST_HEAD(&section->config_items);
+
+		config_items = default_config_items[i];
+		for (j = 0; config_items[j].name != NULL; j++)
+			list_add_tail(&config_items[j].list, &section->config_items);
+
+		list_add_tail(&section->list, sections);
+	}
+
+	return perf_configs;
+}
+
 struct perf_config_set *perf_config_set__new(void)
 {
 	struct perf_config_set *perf_configs = zalloc(sizeof(*perf_configs));
@@ -755,7 +779,7 @@ struct perf_config_set *perf_config_set__new(void)
 	if (!perf_configs)
 		return NULL;
 
-	INIT_LIST_HEAD(&perf_configs->sections);
+	perf_config_set__init(perf_configs);
 	perf_config(collect_config, perf_configs);
 
 	return perf_configs;
@@ -771,13 +795,17 @@ void perf_config_set__delete(struct perf_config_set *perf_configs)
 		list_for_each_entry_safe(config_item, item_tmp,
 					 &section->config_items, list) {
 			list_del(&config_item->list);
-			free((char *)config_item->name);
-			free(config_item->value);
-			free(config_item);
+			if (config_item->is_custom) {
+				free((char *)config_item->name);
+				free(config_item->value);
+				free(config_item);
+			}
 		}
 		list_del(&section->list);
-		free((char *)section->name);
-		free(section);
+		if (section->is_custom) {
+			free((char *)section->name);
+			free(section);
+		}
 	}
 
 	free(perf_configs);
diff --git a/tools/perf/util/config.h b/tools/perf/util/config.h
index aa4a5a2..647842b 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 *name;
 	char *value;
@@ -27,11 +32,13 @@ struct perf_config_item {
 		const char *s;
 	} default_value;
 	enum perf_config_type type;
+	bool is_custom;
 	struct list_head list;
 };
 
 struct perf_config_section {
 	const char *name;
+	bool is_custom;
 	struct list_head config_items;
 	struct list_head list;
 };
-- 
2.5.0