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    Subject[PATCH 2/2] mm: introduce mem_cgroup_put() helper
    Date
    Introduce the mem_cgroup_put() helper, which helps to eliminate
    guarding memcg css release with "#ifdef CONFIG_MEMCG" in multiple
    places.

    Signed-off-by: Roman Gushchin <guro@fb.com>
    Cc: Shakeel Butt <shakeelb@google.com>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Cc: Michal Hocko <mhocko@kernel.org>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    ---
    include/linux/memcontrol.h | 9 +++++++++
    1 file changed, 9 insertions(+)

    diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
    index cf1c3555328f..3607913032be 100644
    --- a/include/linux/memcontrol.h
    +++ b/include/linux/memcontrol.h
    @@ -383,6 +383,11 @@ struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){
    return css ? container_of(css, struct mem_cgroup, css) : NULL;
    }

    +static inline void mem_cgroup_put(struct mem_cgroup *memcg)
    +{
    + css_put(&memcg->css);
    +}
    +
    #define mem_cgroup_from_counter(counter, member) \
    container_of(counter, struct mem_cgroup, member)

    @@ -852,6 +857,10 @@ static inline bool task_in_mem_cgroup(struct task_struct *task,
    return true;
    }

    +static inline void mem_cgroup_put(struct mem_cgroup *memcg)
    +{
    +}
    +
    static inline struct mem_cgroup *
    mem_cgroup_iter(struct mem_cgroup *root,
    struct mem_cgroup *prev,
    --
    2.14.4
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