Commit fabc3fdd authored by Michal Hocko's avatar Michal Hocko Committed by Linus Torvalds

memcg: get rid of mem_cgroup_root_css for !CONFIG_MEMCG

The only user is cgwb_bdi_init and that one depends on
CONFIG_CGROUP_WRITEBACK which in turn depends on CONFIG_MEMCG so it
doesn't make much sense to definte an empty stub for !CONFIG_MEMCG.
Moreover ERR_PTR(-EINVAL) is ugly and would lead to runtime crashes if
used in unguarded code paths.  Better fail during compilation.
Signed-off-by: default avatarMichal Hocko <mhocko@suse.cz>
Reviewed-by: default avatarVladimir Davydov <vdavydov@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 33398cf2
...@@ -498,8 +498,6 @@ void mem_cgroup_split_huge_fixup(struct page *head); ...@@ -498,8 +498,6 @@ void mem_cgroup_split_huge_fixup(struct page *head);
#else /* CONFIG_MEMCG */ #else /* CONFIG_MEMCG */
struct mem_cgroup; struct mem_cgroup;
#define mem_cgroup_root_css ((struct cgroup_subsys_state *)ERR_PTR(-EINVAL))
static inline void mem_cgroup_events(struct mem_cgroup *memcg, static inline void mem_cgroup_events(struct mem_cgroup *memcg,
enum mem_cgroup_events_index idx, enum mem_cgroup_events_index idx,
unsigned int nr) unsigned int nr)
......
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