[PATCH v3 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 <namhy...@kernel.org>
Cc: Jiri Olsa <jo...@kernel.org>
Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
---
 tools/perf/builtin-config.c | 11 +++++++----
 tools/perf/util/config.c    | 35 +++++++++++++++++++++++++++++------
 tools/perf/util/config.h    |  6 ++++++
 3 files changed, 42 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 e3e6ef4..725015f 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -746,6 +746,29 @@ out_free:
        return ret;
 }
 
+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));
@@ -753,7 +776,7 @@ 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->sections);
 
        return perf_configs;
@@ -769,13 +792,13 @@ 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);
        }
 
        free(perf_configs);
diff --git a/tools/perf/util/config.h b/tools/perf/util/config.h
index aa4a5a2..33cf9db 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;
@@ -27,6 +32,7 @@ struct perf_config_item {
                const char *s;
        } default_value;
        enum perf_config_type type;
+       bool is_custom;
        struct list_head list;
 };
 
-- 
2.5.0