Introduce the mem_cgroup_put() helper, which helps to eliminate guarding memcg css release with "#ifdef CONFIG_MEMCG" in multiple places.
Link: http://lkml.kernel.org/r/20180623000600.5818-2-g...@fb.com Signed-off-by: Roman Gushchin <g...@fb.com> Reviewed-by: Shakeel Butt <shake...@google.com> Reviewed-by: Andrew Morton <a...@linux-foundation.org> Acked-by: Johannes Weiner <han...@cmpxchg.org> Acked-by: Michal Hocko <mho...@kernel.org> Signed-off-by: Andrew Morton <a...@linux-foundation.org> Signed-off-by: Stephen Rothwell <s...@canb.auug.org.au> --- include/linux/memcontrol.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 6c6fb116e925..e53e00cdbe3f 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -375,6 +375,11 @@ 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) @@ -837,6 +842,10 @@ 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
