memcg: make cgroup_event deal with mem_cgroup instead of cgroup_subsys_state
cgroup_event is now memcg specific. Replace cgroup_event->css with
->memcg and convert [un]register_event() callbacks to take mem_cgroup
pointer instead of cgroup_subsys_state one. This simplifies the code
slightly and makes css_to_vmpressure() unnecessary which is removed.
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>
diff --git a/mm/vmpressure.c b/mm/vmpressure.c
index 0f25a99..196970a 100644
--- a/mm/vmpressure.c
+++ b/mm/vmpressure.c
@@ -278,7 +278,7 @@
/**
* vmpressure_register_event() - Bind vmpressure notifications to an eventfd
- * @css: css that is interested in vmpressure notifications
+ * @memcg: memcg that is interested in vmpressure notifications
* @eventfd: eventfd context to link notifications with
* @args: event arguments (used to set up a pressure level threshold)
*
@@ -290,10 +290,10 @@
*
* To be used as memcg event method.
*/
-int vmpressure_register_event(struct cgroup_subsys_state *css,
+int vmpressure_register_event(struct mem_cgroup *memcg,
struct eventfd_ctx *eventfd, const char *args)
{
- struct vmpressure *vmpr = css_to_vmpressure(css);
+ struct vmpressure *vmpr = memcg_to_vmpressure(memcg);
struct vmpressure_event *ev;
int level;
@@ -321,7 +321,7 @@
/**
* vmpressure_unregister_event() - Unbind eventfd from vmpressure
- * @css: css handle
+ * @memcg: memcg handle
* @eventfd: eventfd context that was used to link vmpressure with the @cg
*
* This function does internal manipulations to detach the @eventfd from
@@ -330,10 +330,10 @@
*
* To be used as memcg event method.
*/
-void vmpressure_unregister_event(struct cgroup_subsys_state *css,
+void vmpressure_unregister_event(struct mem_cgroup *memcg,
struct eventfd_ctx *eventfd)
{
- struct vmpressure *vmpr = css_to_vmpressure(css);
+ struct vmpressure *vmpr = memcg_to_vmpressure(memcg);
struct vmpressure_event *ev;
mutex_lock(&vmpr->events_lock);