1 files changed, 19 insertions, 12 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index c98dd7cb7076..8b00f6643e93 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -9,12 +9,12 @@
  */
 
 #include <linux/sched.h>
-#include <linux/kref.h>
 #include <linux/cpumask.h>
 #include <linux/nodemask.h>
 #include <linux/rcupdate.h>
 #include <linux/cgroupstats.h>
 #include <linux/prio_heap.h>
+#include <linux/rwsem.h>
 
 #ifdef CONFIG_CGROUPS
 
@@ -137,6 +137,15 @@ struct cgroup {
          * release_list_lock
          */
         struct list_head release_list;
+
+        /* pids_mutex protects the fields below */
+        struct rw_semaphore pids_mutex;
+        /* Array of process ids in the cgroup */
+        pid_t *tasks_pids;
+        /* How many files are using the current tasks_pids array */
+        int pids_use_count;
+        /* Length of the current tasks_pids array */
+        int pids_length;
 };
 
 /* A css_set is a structure holding pointers to a set of
@@ -149,7 +158,7 @@ struct cgroup {
 struct css_set {
 
         /* Reference count */
-        struct kref ref;
+        atomic_t refcount;
 
         /*
          * List running through all cgroup groups in the same hash
@@ -326,7 +335,8 @@ struct cgroup_subsys {
          */
         void (*mm_owner_changed)(struct cgroup_subsys *ss,
                                         struct cgroup *old,
-                                        struct cgroup *new);
+                                        struct cgroup *new,
+                                        struct task_struct *p);
         int subsys_id;
         int active;
         int disabled;
@@ -393,6 +403,9 @@ void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it);
 int cgroup_scan_tasks(struct cgroup_scanner *scan);
 int cgroup_attach_task(struct cgroup *, struct task_struct *);
 
+void cgroup_mm_owner_callbacks(struct task_struct *old,
+                               struct task_struct *new);
+
 #else /* !CONFIG_CGROUPS */
 
 static inline int cgroup_init_early(void) { return 0; }
@@ -411,15 +424,9 @@ static inline int cgroupstats_build(struct cgroupstats *stats,
         return -EINVAL;
 }
 
+static inline void cgroup_mm_owner_callbacks(struct task_struct *old,
+                                             struct task_struct *new) {}
+
 #endif /* !CONFIG_CGROUPS */
 
-#ifdef CONFIG_MM_OWNER
-extern void
-cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct *new);
-#else /* !CONFIG_MM_OWNER */
-static inline void
-cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct *new)
-{
-}
-#endif /* CONFIG_MM_OWNER */
 #endif /* _LINUX_CGROUP_H */