On Mon 30-07-18 11:00:58, Roman Gushchin wrote: > Introduce the mem_cgroup_put() helper, which helps to eliminate guarding > memcg css release with "#ifdef CONFIG_MEMCG" in multiple places. Is there any reason for this to be a separate patch? I usually do not like to add helpers without their users because this makes review harder. This one is quite trivial to fit into Patch3 easilly. > Link: http://lkml.kernel.org/r/20180623000600.5818-2-guro@xxxxxx > Signed-off-by: Roman Gushchin <guro@xxxxxx> > Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx> > Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: Shakeel Butt <shakeelb@xxxxxxxxxx> > Cc: Johannes Weiner <hannes@xxxxxxxxxxx> > Cc: Michal Hocko <mhocko@xxxxxxxxxx> > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Signed-off-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> > --- > 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 > -- Michal Hocko SUSE Labs
