[PATCH v4 3/6] perf config: Use zfree() instead of free() at perf_config_set__delete()

[Taeung Song]

perf_config_set__delete() delete allocated the config set
but the global variable 'config_set' is used all around.

So purge and zfree by an address of the global variable
, i.e. 'struct perf_config_set **' type
instead of using local variable 'set' of which type
is 'struct perf_config_set *'.

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 |  2 +-
 tools/perf/util/config.c    | 11 +++++++----
 tools/perf/util/config.h    |  2 +-
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index b3bc01a..f23fe52 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -105,7 +105,7 @@ int cmd_config(int argc, const char **argv, const char 
*prefix __maybe_unused)
                usage_with_options(config_usage, config_options);
        }
 
-       perf_config_set__delete(config_set);
+       perf_config_set__delete(&config_set);
 out_err:
        return ret;
 }
diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index adf2bad..79ded23 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -642,7 +642,7 @@ static int collect_config(const char *var, const char 
*value,
 
 out_free:
        free(key);
-       perf_config_set__delete(set);
+       perf_config_set__delete(&set);
        return -1;
 }
 
@@ -740,10 +740,13 @@ static void perf_config_set__purge(struct perf_config_set 
*set)
        }
 }
 
-void perf_config_set__delete(struct perf_config_set *set)
+void perf_config_set__delete(struct perf_config_set **set)
 {
-       perf_config_set__purge(set);
-       free(set);
+       if (*set == NULL)
+               return;
+
+       perf_config_set__purge(*set);
+       zfree(set);
 }
 
 /*
diff --git a/tools/perf/util/config.h b/tools/perf/util/config.h
index ea157a4..271b429 100644
--- a/tools/perf/util/config.h
+++ b/tools/perf/util/config.h
@@ -23,6 +23,6 @@ struct perf_config_set {
 extern struct perf_config_set *config_set;
 
 struct perf_config_set *perf_config_set__new(void);
-void perf_config_set__delete(struct perf_config_set *set);
+void perf_config_set__delete(struct perf_config_set **set);
 
 #endif /* __PERF_CONFIG_H */
-- 
2.5.0