[PATCH v2 2/5] perf config: Let show_config() work with perf_config_set

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

Current show_config() has a problem when user or
system config files have same config variables i.e.

    # cat ~/.perfconfig
        [top]
            children = false

    when $(sysconfdir) is /usr/local/etc
    # cat /usr/local/etc/perfconfig
        [top]
            children = true

Before:
    # perf config --user --list
    top.children=false

    # perf config --system --list
    top.children=true

    # perf config --list
    top.children=true
    top.children=false

Because perf_config() can call show_config()
each the config file (user and system).
So fix it.

After:
    # perf config --user --list
    top.children=false

    # perf config --system --list
    top.children=true

    # perf config --list
    top.children=false

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 | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index 412c725..2217772 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -33,13 +33,21 @@ static struct option config_options[] = {
 	OPT_END()
 };
 
-static int show_config(const char *key, const char *value,
-		       void *cb __maybe_unused)
+static int show_config(struct perf_config_set *perf_configs)
 {
-	if (value)
-		printf("%s=%s\n", key, value);
-	else
-		printf("%s\n", key);
+	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)
+			printf("%s.%s=%s\n", config->section,
+			       config->name, value);
+	}
 
 	return 0;
 }
@@ -47,6 +55,7 @@ static int show_config(const char *key, const char *value,
 int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	int ret = 0;
+	struct perf_config_set *perf_configs;
 	char *user_config = mkpath("%s/.perfconfig", getenv("HOME"));
 
 	argc = parse_options(argc, argv, config_options, config_usage,
@@ -64,13 +73,19 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 	else if (use_user_config)
 		config_exclusive_filename = user_config;
 
+	perf_configs = perf_config_set__new();
+	if (!perf_configs) {
+		ret = -1;
+		goto out_err;
+	}
+
 	switch (actions) {
 	case ACTION_LIST:
 		if (argc) {
 			pr_err("Error: takes no arguments\n");
 			parse_options_usage(config_usage, config_options, "l", 1);
 		} else {
-			ret = perf_config(show_config, NULL);
+			ret = show_config(perf_configs);
 			if (ret < 0) {
 				const char * config_filename = config_exclusive_filename;
 				if (!config_exclusive_filename)
@@ -84,5 +99,7 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 		usage_with_options(config_usage, config_options);
 	}
 
+	perf_config_set__delete(perf_configs);
+out_err:
 	return ret;
 }
-- 
2.5.0