config: Enable CONFIG_MEMCG, but leave it disabled (due to memory cost). Enable with...

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 2c785f9570243879d79b277d27393485824b5056..2650df194b5d0bb39bb92c295d93f691b00faffb 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5637,7 +5637,7 @@ int __init cgroup_init_early(void)
        return 0;
 }
 
-static u16 cgroup_disable_mask __initdata;
+static u16 cgroup_disable_mask __initdata = 1<<0;
 
 /**
  * cgroup_init - cgroup initialization
@@ -6178,6 +6178,28 @@ static int __init cgroup_no_v1(char *str)
 }
 __setup("cgroup_no_v1=", cgroup_no_v1);
 
+static int __init cgroup_enable(char *str)
+{
+       struct cgroup_subsys *ss;
+       char *token;
+       int i;
+
+       while ((token = strsep(&str, ",")) != NULL) {
+               if (!*token)
+                       continue;
+
+               for_each_subsys(ss, i) {
+                       if (strcmp(token, ss->name) &&
+                           strcmp(token, ss->legacy_name))
+                               continue;
+
+                       cgroup_disable_mask &= ~(1 << i);
+               }
+       }
+       return 1;
+}
+__setup("cgroup_enable=", cgroup_enable);
+
 /**
  * css_tryget_online_from_dir - get corresponding css from a cgroup dentry
  * @dentry: directory dentry of interest