[PATCH v2 4/5] perf config: Reimplement show_config() using perf_config()

[Taeung Song]

Old show_config() directly use config set so
there are many duplicated code with perf_config_set__iter().

So reimplement show_config() using perf_config() that use
perf_config_set__iter() with config set that already
contains all configs.

Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Masami Hiramatsu <mhira...@kernel.org>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
---
 tools/perf/builtin-config.c | 29 +++++++----------------------
 1 file changed, 7 insertions(+), 22 deletions(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index 8eef3fb..4a61411 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -33,28 +33,13 @@ static struct option config_options[] = {
        OPT_END()
 };
 
-static int show_config(struct perf_config_set *set)
+static int show_config(const char *key, const char *value,
+                      void *cb __maybe_unused)
 {
-       struct perf_config_section *section;
-       struct perf_config_item *item;
-       struct list_head *sections;
-
-       if (set == NULL)
-               return -1;
-
-       sections = &set->sections;
-       if (list_empty(sections))
-               return -1;
-
-       list_for_each_entry(section, sections, node) {
-               list_for_each_entry(item, &section->items, node) {
-                       char *value = item->value;
-
-                       if (value)
-                               printf("%s.%s=%s\n", section->name,
-                                      item->name, value);
-               }
-       }
+       if (value)
+               printf("%s=%s\n", key, value);
+       else
+               printf("%s\n", key);
 
        return 0;
 }
@@ -92,7 +77,7 @@ int cmd_config(int argc, const char **argv, const char 
*prefix __maybe_unused)
                        pr_err("Error: takes no arguments\n");
                        parse_options_usage(config_usage, config_options, "l", 
1);
                } else {
-                       ret = show_config(set);
+                       ret = perf_config(show_config, NULL);
                        if (ret < 0) {
                                const char * config_filename = 
config_exclusive_filename;
                                if (!config_exclusive_filename)
-- 
2.5.0