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perf evlist: Destructors should accept NULL

tip:perf/core tip-bot for Arnaldo Carvalho de Melo 1 participant 1 message Jun 26, 2016 perf events

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Commit-ID:  0b04b3dcdfb9aeb0e83c8ca322bf0830ee51ce38
Gitweb:     http://git.kernel.org/tip/0b04b3dcdfb9aeb0e83c8ca322bf0830ee51ce38
Author:     Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Tue, 21 Jun 2016 18:15:45 -0300
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Wed, 22 Jun 2016 10:01:48 -0300

perf evlist: Destructors should accept NULL

And do nothing, just like free(), to avoid having to test it in callers, usually in error paths.

Cc Adrian Hunter <[email protected]>
Cc David Ahern <[email protected]>
Cc Jiri Olsa <[email protected]>
Cc Masami Hiramatsu <[email protected]>
Cc Namhyung Kim <[email protected]>
Cc Wang Nan <[email protected]>
Link http://lkml.kernel.org/n/[email protected] open here
Signed-off-by Arnaldo Carvalho de Melo <[email protected]>
---
 tools/perf/builtin-kvm.c                  | 3 +--
 tools/perf/tests/event-times.c            | 3 +--
 tools/perf/tests/parse-no-sample-id-all.c | 3 +--
 tools/perf/util/evlist.c                  | 3 +++
 4 files changed, 6 insertions(+), 6 deletions(-)
tools/perf/builtin-kvm.c +1 -2
index 6487c06..ad46e91 100644
@@ -1429,8 +1429,7 @@ out:
 	if (kvm->session)
 		perf_session__delete(kvm->session);
 	kvm->session = NULL;
-	if (kvm->evlist)
-		perf_evlist__delete(kvm->evlist);
+	perf_evlist__delete(kvm->evlist);
 
 	return err;
 }
tools/perf/tests/event-times.c +1 -2
index 95fb744..9f5698a 100644
@@ -200,8 +200,7 @@ static int test_times(int (attach)(struct perf_evlist *),
 		 count.ena, count.run);
 
 out_err:
-	if (evlist)
-		perf_evlist__delete(evlist);
+	perf_evlist__delete(evlist);
 	return !err ? TEST_OK : TEST_FAIL;
 }
tools/perf/tests/parse-no-sample-id-all.c +1 -2
index 294c76b..81c6eea 100644
@@ -44,8 +44,7 @@ static int process_events(union perf_event **events, size_t count)
 	for (i = 0; i < count && !err; i++)
 		err = process_event(&evlist, events[i]);
 
-	if (evlist)
-		perf_evlist__delete(evlist);
+	perf_evlist__delete(evlist);
 
 	return err;
 }
tools/perf/util/evlist.c +3 -0
index 1b918aa..fcb8f1f 100644
@@ -127,6 +127,9 @@ void perf_evlist__exit(struct perf_evlist *evlist)
 
 void perf_evlist__delete(struct perf_evlist *evlist)
 {
+	if (evlist == NULL)
+		return;
+
 	perf_evlist__munmap(evlist);
 	perf_evlist__close(evlist);
 	cpu_map__put(evlist->cpus);