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Subject[PATCH 3/4] perf cgroup: Clean up perf_cgroup_create()
- Use kzalloc() to replace kmalloc() + memset().
- Remove redundant initialization, since alloc_percpu() returns
zero-filled percpu memory.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
---
kernel/perf_event.c | 11 +----------
1 files changed, 1 insertions(+), 10 deletions(-)
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index dca92b2..d6b3d16 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -7341,26 +7341,17 @@ 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;
}

--
1.6.3

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