perf config: Add config set interface

Add interface to load config set from custom file by using
perf_config_set__load_file function.

It will be used in perf daemon command to process custom config file.

Signed-off-by: Jiri Olsa <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Alexei Budankov <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Michael Petlan <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Link: http://lore.kernel.org/lkml/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/config.c

···
 	return set;
 }
 
+struct perf_config_set *perf_config_set__load_file(const char *file)
+{
+	struct perf_config_set *set = zalloc(sizeof(*set));
+
+	if (set) {
+		INIT_LIST_HEAD(&set->sections);
+		perf_config_from_file(collect_config, file, set);
+	}
+
+	return set;
+}
+
 static int perf_config__init(void)
 {
 	if (config_set == NULL)
···
 	return config_set == NULL;
 }
 
-int perf_config(config_fn_t fn, void *data)
+int perf_config_set(struct perf_config_set *set,
+		    config_fn_t fn, void *data)
 {
 	int ret = 0;
 	char key[BUFSIZ];
 	struct perf_config_section *section;
 	struct perf_config_item *item;
 
-	if (config_set == NULL && perf_config__init())
-		return -1;
-
-	perf_config_set__for_each_entry(config_set, section, item) {
+	perf_config_set__for_each_entry(set, section, item) {
 		char *value = item->value;
 
 		if (value) {
···
 	}
 out:
 	return ret;
+}
+
+int perf_config(config_fn_t fn, void *data)
+{
+	if (config_set == NULL && perf_config__init())
+		return -1;
+
+	return perf_config_set(config_set, fn, data);
 }
 
 void perf_config__exit(void)

tools/perf/util/config.h

···
 
 int perf_default_config(const char *, const char *, void *);
 int perf_config(config_fn_t fn, void *);
+int perf_config_set(struct perf_config_set *set,
+		    config_fn_t fn, void *data);
 int perf_config_int(int *dest, const char *, const char *);
 int perf_config_u8(u8 *dest, const char *name, const char *value);
 int perf_config_u64(u64 *dest, const char *, const char *);
···
 const char *perf_etc_perfconfig(void);
 
 struct perf_config_set *perf_config_set__new(void);
+struct perf_config_set *perf_config_set__load_file(const char *file);
 void perf_config_set__delete(struct perf_config_set *set);
 int perf_config_set__collect(struct perf_config_set *set, const char *file_name,
 			     const char *var, const char *value);