Index: systemd-204/rules/80-hotplug-cpu-mem.rules
===================================================================
--- /dev/null
+++ systemd-204/rules/80-hotplug-cpu-mem.rules
@@ -0,0 +1,9 @@
+# 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"
Index: systemd-204/Makefile.am
===================================================================
--- systemd-204.orig/Makefile.am
+++ systemd-204/Makefile.am
@@ -2238,6 +2238,10 @@ 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 += \