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mm: introduce mem_cgroup_put() helper 

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-guro@fb.com
Signed-off-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roman Gushchin 2018-08-17 15:46:36 -07:00 committed by Linus Torvalds
parent 1a9b4b3d75
commit dc0b58643a
1 changed files with 9 additions and 0 deletions
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9
include/linux/memcontrol.h
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@ -378,6 +378,11 @@ struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){
return css ? container_of(css, struct mem_cgroup, css) : NULL; 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) \ #define mem_cgroup_from_counter(counter, member) \
container_of(counter, struct mem_cgroup, member) container_of(counter, struct mem_cgroup, member)
@ -850,6 +855,10 @@ static inline bool task_in_mem_cgroup(struct task_struct *task,
return true; return true;
} }
static inline void mem_cgroup_put(struct mem_cgroup *memcg)
{
}
static inline struct mem_cgroup * static inline struct mem_cgroup *
mem_cgroup_iter(struct mem_cgroup *root, mem_cgroup_iter(struct mem_cgroup *root,
struct mem_cgroup *prev, struct mem_cgroup *prev,