[tip:perf/core] perf cgroup: Introduce find_cgroup() method

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  b80271f76ac5fe498f8fb701b2745dcd841627cc
Gitweb:     https://git.kernel.org/tip/b80271f76ac5fe498f8fb701b2745dcd841627cc
Author:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Tue, 6 Mar 2018 10:27:00 -0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 7 Mar 2018 10:22:25 -0300

perf cgroup: Introduce find_cgroup() method

To break down complexity in add_cgroup().

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: https://lkml.kernel.org/n/tip-5yqshcf5hm837n7c86u7lhjf@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/cgroup.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
index 8ea964461eb7..84dfc34a6d0f 100644
--- a/tools/perf/util/cgroup.c
+++ b/tools/perf/util/cgroup.c
@@ -90,11 +90,10 @@ static int open_cgroup(char *name)
 	return fd;
 }
 
-static int add_cgroup(struct perf_evlist *evlist, char *str)
+static struct cgroup *evlist__find_cgroup(struct perf_evlist *evlist, char *str)
 {
 	struct perf_evsel *counter;
 	struct cgroup *cgrp = NULL;
-	int n;
 	/*
 	 * check if cgrp is already defined, if so we reuse it
 	 */
@@ -107,6 +106,15 @@ static int add_cgroup(struct perf_evlist *evlist, char *str)
 		}
 	}
 
+	return cgrp;
+}
+
+static int add_cgroup(struct perf_evlist *evlist, char *str)
+{
+	struct perf_evsel *counter;
+	struct cgroup *cgrp = evlist__find_cgroup(evlist, str);
+	int n;
+
 	if (!cgrp) {
 		cgrp = zalloc(sizeof(*cgrp));
 		if (!cgrp)