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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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