openwrtv3/target/linux/brcm2708/patches-4.9/950-0060-config-Enable-CONFIG_MEMCG-but-leave-it-disabled-due.patch

From c50fe09c78e9b87137e0188139c774bd4f12dcb2 Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Wed, 18 Dec 2013 22:16:19 +0000
Subject: [PATCH] config: Enable CONFIG_MEMCG, but leave it disabled (due to
 memory cost). Enable with cgroup_enable=memory.

---
 kernel/cgroup.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5626,7 +5626,7 @@ 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
@@ -6163,6 +6163,28 @@ 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