linux-kernel - [PATCH v7 4/7] perf config: Use zfree() instead of free() at perf_config_set_

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Date:	Tue,  7 Jun 2016 18:26:14 +0900
From:	Taeung Song <treeze.taeung@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Taeung Song <treeze.taeung@...il.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH v7 4/7] perf config: Use zfree() instead of free() at perf_config_set__delete()

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 <namhyung@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Signed-off-by: Taeung Song <treeze.taeung@...il.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 02fc6d5..2441585 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -699,7 +699,7 @@ struct perf_config_set *perf_config_set__new(void)
 	if (set) {
 		INIT_LIST_HEAD(&set->sections);
 		if (perf_config_set__init(set) < 0) {
-			perf_config_set__delete(set);
+			perf_config_set__delete(&set);
 			set = NULL;
 		}
 	}
@@ -741,10 +741,13 @@ 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