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mm: introduce mem_cgroup_put() helper

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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/[email protected]
Signed-off-by: Roman Gushchin <[email protected]>
Reviewed-by: Shakeel Butt <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Acked-by: David Rientjes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Roman Gushchin authored and Linus Torvalds committed 2018-08-17 16:20:29 -07:00
1 parent 1a9b4b3d75
commit dc0b58643a
1 file changed
+9
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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;
}
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)
@@ -850,6 +855,10 @@ 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,