--- systemd-210/rules/80-hotplug-cpu-mem.rules
+++ systemd-210/rules/80-hotplug-cpu-mem.rules	2014-05-21 15:47:01.885605543 +0000
@@ -0,0 +1,12 @@
+# do not edit this file, it will be overwritten on update
+
+# Hotplug physical CPU
+SUBSYSTEM=="cpu", ACTION=="add", TEST=="online", ATTR{online}=="0", \
+ ATTR{online}="1"
+
+# Hotplug physical memory
+SUBSYSTEM=="memory", ACTION=="add", TEST=="state", ATTR{state}=="offline", \
+ ATTR{state}="online", TAG+="tmpfs"
+
+#
+TAG=="tmpfs", RUN+="/usr/lib/udev/remount-tmpfs"
--- systemd-210/Makefile.am
+++ systemd-210/Makefile.am
@@ -2480,6 +2480,10 @@ dist_udevrules_DATA += \
 	rules/73-seat-numlock.rules
 
 # ------------------------------------------------------------------------------
+dist_udevrules_DATA += \
+	rules/80-hotplug-cpu-mem.rules
+
+# ------------------------------------------------------------------------------
 if ENABLE_GUDEV
 if ENABLE_GTK_DOC
 SUBDIRS += \