[PATCH] Hotplug CPUs: Remove CPU_OFFLINE Notifier

We no longer have a CPU_OFFLINE notifier: we freeze the machine and
kill the CPU atomically.  Remove it.

include/linux/notifier.h

@@ -63,7 +63,6 @@ extern int notifier_call_chain(struct notifier_block **n, unsigned long val, voi
 #define CPU_ONLINE	0x0002 /* CPU (unsigned)v is up */
 #define CPU_UP_PREPARE	0x0003 /* CPU (unsigned)v coming up */
 #define CPU_UP_CANCELED	0x0004 /* CPU (unsigned)v NOT coming up */
-#define CPU_OFFLINE	0x0005 /* CPU (unsigned)v offline (still scheduling) */
 #define CPU_DEAD	0x0006 /* CPU (unsigned)v dead */
 
 #endif /* __KERNEL__ */