[PATCH 3/3] Use the res_counter_populate in memory controller

[Pavel Emelyanov <xemul-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>]

Note, that the controller code dealing with the cftype files
for resource counters becomes much shorter and won't have to 
be changed in the future.

Signed-off-by: Pavel Emelyanov <xemul-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>

---

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 1b8bf24..2e62d24 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -519,28 +519,14 @@ static ssize_t mem_control_type_read(str
 
 static struct cftype mem_cgroup_files[] = {
 	{
-		.name = "usage_in_bytes",
-		.private = RES_USAGE,
-		.read = mem_cgroup_read,
-	},
-	{
-		.name = "limit_in_bytes",
-		.private = RES_LIMIT,
-		.write = mem_cgroup_write,
-		.read = mem_cgroup_read,
-	},
-	{
-		.name = "failcnt",
-		.private = RES_FAILCNT,
-		.read = mem_cgroup_read,
-	},
-	{
 		.name = "control_type",
 		.write = mem_control_type_write,
 		.read = mem_control_type_read,
 	},
 };
 
+static struct cftype mem_res_counter_files[RES_CFT_MAX];
+
 static struct mem_cgroup init_mem_cgroup;
 
 static struct cgroup_subsys_state *
@@ -574,6 +560,13 @@ static void mem_cgroup_destroy(struct cg
 static int mem_cgroup_populate(struct cgroup_subsys *ss,
 				struct cgroup *cont)
 {
+	int ret;
+
+	ret = res_counter_populate(ss, cont, mem_res_counter_files,
+			RES_UNITS_BYTES, mem_cgroup_read, mem_cgroup_write);
+	if (ret)
+		return ret;
+
 	return cgroup_add_files(cont, ss, mem_cgroup_files,
 					ARRAY_SIZE(mem_cgroup_files));
 }