4 files changed, 20 insertions, 48 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 66c1e3b5c0f2..835ae29e4ea2 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5349,19 +5349,15 @@ static struct cftype debug_files[] =  {
                 .name = "releasable",
                 .read_u64 = releasable_read,
         },
-};
 
-static int debug_populate(struct cgroup_subsys *ss, struct cgroup *cont)
-{
-        return cgroup_add_files(cont, ss, debug_files,
-                                ARRAY_SIZE(debug_files));
-}
+        { }     /* terminate */
+};
 
 struct cgroup_subsys debug_subsys = {
         .name = "debug",
         .create = debug_create,
         .destroy = debug_destroy,
-        .populate = debug_populate,
         .subsys_id = debug_subsys_id,
+        .base_cftypes = debug_files,
 };
 #endif /* CONFIG_CGROUP_DEBUG */
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index f86e93920b62..3649fc6b3eaa 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -358,24 +358,19 @@ static int freezer_write(struct cgroup *cgroup,
 static struct cftype files[] = {
         {
                 .name = "state",
+                .flags = CFTYPE_NOT_ON_ROOT,
                 .read_seq_string = freezer_read,
                 .write_string = freezer_write,
         },
+        { }     /* terminate */
 };
 
-static int freezer_populate(struct cgroup_subsys *ss, struct cgroup *cgroup)
-{
-        if (!cgroup->parent)
-                return 0;
-        return cgroup_add_files(cgroup, ss, files, ARRAY_SIZE(files));
-}
-
 struct cgroup_subsys freezer_subsys = {
         .name           = "freezer",
         .create         = freezer_create,
         .destroy        = freezer_destroy,
-        .populate       = freezer_populate,
         .subsys_id      = freezer_subsys_id,
         .can_attach     = freezer_can_attach,
         .fork           = freezer_fork,
+        .base_cftypes   = files,
 };
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index b96ad75b7e64..2382683617a3 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1765,28 +1765,17 @@ static struct cftype files[] = {
                 .write_u64 = cpuset_write_u64,
                 .private = FILE_SPREAD_SLAB,
         },
-};
-
-static struct cftype cft_memory_pressure_enabled = {
-        .name = "memory_pressure_enabled",
-        .read_u64 = cpuset_read_u64,
-        .write_u64 = cpuset_write_u64,
-        .private = FILE_MEMORY_PRESSURE_ENABLED,
-};
 
-static int cpuset_populate(struct cgroup_subsys *ss, struct cgroup *cont)
-{
-        int err;
+        {
+                .name = "memory_pressure_enabled",
+                .flags = CFTYPE_ONLY_ON_ROOT,
+                .read_u64 = cpuset_read_u64,
+                .write_u64 = cpuset_write_u64,
+                .private = FILE_MEMORY_PRESSURE_ENABLED,
+        },
 
-        err = cgroup_add_files(cont, ss, files, ARRAY_SIZE(files));
-        if (err)
-                return err;
-        /* memory_pressure_enabled is in root cpuset only */
-        if (!cont->parent)
-                err = cgroup_add_file(cont, ss,
-                                      &cft_memory_pressure_enabled);
-        return err;
-}
+        { }     /* terminate */
+};
 
 /*
  * post_clone() is called during cgroup_create() when the
@@ -1887,9 +1876,9 @@ struct cgroup_subsys cpuset_subsys = {
         .destroy = cpuset_destroy,
         .can_attach = cpuset_can_attach,
         .attach = cpuset_attach,
-        .populate = cpuset_populate,
         .post_clone = cpuset_post_clone,
         .subsys_id = cpuset_subsys_id,
+        .base_cftypes = files,
         .early_init = 1,
 };
 
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 4603b9d8f30a..afc6d7e71557 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7970,13 +7970,9 @@ static struct cftype cpu_files[] = {
                 .write_u64 = cpu_rt_period_write_uint,
         },
 #endif
+        { }     /* terminate */
 };
 
-static int cpu_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cont)
-{
-        return cgroup_add_files(cont, ss, cpu_files, ARRAY_SIZE(cpu_files));
-}
-
 struct cgroup_subsys cpu_cgroup_subsys = {
         .name           = "cpu",
         .create         = cpu_cgroup_create,
@@ -7984,8 +7980,8 @@ struct cgroup_subsys cpu_cgroup_subsys = {
         .can_attach     = cpu_cgroup_can_attach,
         .attach         = cpu_cgroup_attach,
         .exit           = cpu_cgroup_exit,
-        .populate       = cpu_cgroup_populate,
         .subsys_id      = cpu_cgroup_subsys_id,
+        .base_cftypes   = cpu_files,
         .early_init     = 1,
 };
 
@@ -8170,13 +8166,9 @@ static struct cftype files[] = {
                 .name = "stat",
                 .read_map = cpuacct_stats_show,
         },
+        { }     /* terminate */
 };
 
-static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
-{
-        return cgroup_add_files(cgrp, ss, files, ARRAY_SIZE(files));
-}
-
 /*
  * charge this task's execution time to its accounting group.
  *
@@ -8208,7 +8200,7 @@ struct cgroup_subsys cpuacct_subsys = {
         .name = "cpuacct",
         .create = cpuacct_create,
         .destroy = cpuacct_destroy,
-        .populate = cpuacct_populate,
         .subsys_id = cpuacct_subsys_id,
+        .base_cftypes = files,
 };
 #endif  /* CONFIG_CGROUP_CPUACCT */