memcg: remove cgroup_event->cft

The only use of cgroup_event->cft is distinguishing "usage_in_bytes"
and "memsw.usgae_in_bytes" for mem_cgroup_usage_[un]register_event(),
which can be done by adding an explicit argument to the function and
implementing two wrappers so that the two cases can be distinguished
from the function alone.

Remove cgroup_event->cft and the related code including
[un]register_events() methods.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.cz>

1 files changed, 0 insertions, 2 deletions

diff --git a/include/linux/vmpressure.h b/include/linux/vmpressure.h
index 9dd1914f1a6c..b048365a7ed9 100644
--- a/include/linux/vmpressure.h
+++ b/include/linux/vmpressure.h
@@ -36,11 +36,9 @@ extern struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg);
 extern struct cgroup_subsys_state *vmpressure_to_css(struct vmpressure *vmpr);
 extern struct vmpressure *css_to_vmpressure(struct cgroup_subsys_state *css);
 extern int vmpressure_register_event(struct cgroup_subsys_state *css,
-                                     struct cftype *cft,
                                      struct eventfd_ctx *eventfd,
                                      const char *args);
 extern void vmpressure_unregister_event(struct cgroup_subsys_state *css,
-                                        struct cftype *cft,
                                         struct eventfd_ctx *eventfd);
 #else
 static inline void vmpressure(gfp_t gfp, struct mem_cgroup *memcg,