perf cgroup: Clean up perf_cgroup_create()

Li Zefan · Ingo Molnar · commit 1b15d0558e82 · 2011-03-04T11:32:51.000+01:00
- Use kzalloc() to replace kmalloc() + memset().

- Remove redundant initialization, since alloc_percpu() returns
  zero-filled percpu memory.

Signed-off-by: Li Zefan &lt;lizf@cn.fujitsu.com&gt;
Acked-by: Stephane Eranian &lt;eranian@google.com&gt;
Signed-off-by: Peter Zijlstra &lt;a.p.zijlstra@chello.nl&gt;
LKML-Reference: &lt;4D6F347E.2010806@cn.fujitsu.com&gt;
Signed-off-by: Ingo Molnar &lt;mingo@elte.hu&gt;
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
@@ -7346,26 +7346,17 @@ static struct cgroup_subsys_state *perf_cgroup_create(
 	struct cgroup_subsys *ss, struct cgroup *cont)
 {
 	struct perf_cgroup *jc;
-	struct perf_cgroup_info *t;
-	int c;
 
-	jc = kmalloc(sizeof(*jc), GFP_KERNEL);
+	jc = kzalloc(sizeof(*jc), GFP_KERNEL);
 	if (!jc)
 		return ERR_PTR(-ENOMEM);
 
-	memset(jc, 0, sizeof(*jc));
-
 	jc->info = alloc_percpu(struct perf_cgroup_info);
 	if (!jc->info) {
 		kfree(jc);
 		return ERR_PTR(-ENOMEM);
 	}
 
-	for_each_possible_cpu(c) {
-		t = per_cpu_ptr(jc->info, c);
-		t->time = 0;
-		t->timestamp = 0;
-	}
 	return &jc->css;
 }
 
