diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 4744ef9..d028721 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -95,6 +95,8 @@
 					* Called on the new cpu, just before
 					* enabling interrupts. Must not sleep,
 					* must not fail */
+#define CPU_DYING_IDLE		0x000B /* CPU (unsigned)v dying, reached
+					* idle loop. */
 #define CPU_BROKEN		0x000C /* CPU (unsigned)v did not die properly,
 					* perhaps due to preemption. */