diff -NurpP --minimal linux-4.1.35-vs2.3.8.5.2/include/linux/vserver/limit.h linux-4.1.35-vs2.3.8.5.3/include/linux/vserver/limit.h
--- linux-4.1.35-vs2.3.8.5.2/include/linux/vserver/limit.h	2016-07-05 04:41:47.000000000 +0000
+++ linux-4.1.35-vs2.3.8.5.3/include/linux/vserver/limit.h	2016-11-12 13:56:54.000000000 +0000
@@ -52,9 +52,15 @@ typedef unsigned long rlim_t;
 
 struct sysinfo;
 
+#ifdef	CONFIG_MEMCG
 void vx_vsi_meminfo(struct sysinfo *);
 void vx_vsi_swapinfo(struct sysinfo *);
 long vx_vsi_cached(struct sysinfo *);
+#else	/* !CONFIG_MEMCG */
+#define vx_vsi_meminfo(s) do { } while (0)
+#define vx_vsi_swapinfo(s) do { } while (0)
+#define vx_vsi_cached(s) (0L)
+#endif	/* !CONFIG_MEMCG */
 
 #define NUM_LIMITS	24
 
diff -NurpP --minimal linux-4.1.35-vs2.3.8.5.2/kernel/vserver/limit.c linux-4.1.35-vs2.3.8.5.3/kernel/vserver/limit.c
--- linux-4.1.35-vs2.3.8.5.2/kernel/vserver/limit.c	2016-07-06 05:40:59.000000000 +0000
+++ linux-4.1.35-vs2.3.8.5.3/kernel/vserver/limit.c	2016-11-12 12:58:54.000000000 +0000
@@ -255,6 +255,7 @@ int vc_rlimit_stat(struct vx_info *vxi,
 }
 
 
+#ifdef	CONFIG_MEMCG
 void vx_vsi_meminfo(struct sysinfo *val)
 {
 	struct mem_cgroup *mcg;
@@ -338,4 +339,5 @@ out:
 #endif
 	return cache;
 }
+#endif	/* !CONFIG_MEMCG */