linux-kernel - [tip:perf/core] perf comm: Use atomic.h for refcounting

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Date:	Wed, 27 May 2015 09:47:45 -0700
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	dzickus@...hat.com, acme@...hat.com, jolsa@...hat.com, bp@...e.de,
	fweisbec@...il.com, linux-kernel@...r.kernel.org, mingo@...nel.org,
	tglx@...utronix.de, eranian@...gle.com, namhyung@...nel.org,
	adrian.hunter@...el.com, hpa@...or.com, dsahern@...il.com
Subject: [tip:perf/core] perf comm: Use atomic.h for refcounting

Commit-ID:  86c19525b7e953217e5ad2b5496029b1ac6fe26b
Gitweb:     http://git.kernel.org/tip/86c19525b7e953217e5ad2b5496029b1ac6fe26b
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Tue, 19 May 2015 19:07:42 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 27 May 2015 12:21:43 -0300

perf comm: Use atomic.h for refcounting

Now that we have atomic.h, we should convert all of the existing
refcounts to use it.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: David Ahern <dsahern@...il.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-quzeuy3jwsyod6e06o39cl6y@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/comm.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/comm.c b/tools/perf/util/comm.c
index b2bb59d..21b7ff3 100644
--- a/tools/perf/util/comm.c
+++ b/tools/perf/util/comm.c
@@ -2,24 +2,27 @@
 #include "util.h"
 #include <stdlib.h>
 #include <stdio.h>
+#include <linux/atomic.h>
 
 struct comm_str {
 	char *str;
 	struct rb_node rb_node;
-	int ref;
+	atomic_t refcnt;
 };
 
 /* Should perhaps be moved to struct machine */
 static struct rb_root comm_str_root;
 
-static void comm_str__get(struct comm_str *cs)
+static struct comm_str *comm_str__get(struct comm_str *cs)
 {
-	cs->ref++;
+	if (cs)
+		atomic_inc(&cs->refcnt);
+	return cs;
 }
 
 static void comm_str__put(struct comm_str *cs)
 {
-	if (!--cs->ref) {
+	if (cs && atomic_dec_and_test(&cs->refcnt)) {
 		rb_erase(&cs->rb_node, &comm_str_root);
 		zfree(&cs->str);
 		free(cs);
@@ -40,6 +43,8 @@ static struct comm_str *comm_str__alloc(const char *str)
 		return NULL;
 	}
 
+	atomic_set(&cs->refcnt, 0);
+
 	return cs;
 }
 
--
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