A mechanism to allow debuggers to learn about starting/dying CPUs as
early/late as possible. Arch-dependent changes for i386 and x86_64
will follow.

Signed-Off-By: Jan Beulich <jbeulich@novell.com>

Index: 2.6.14-nlkd/include/linux/cpu.h
===================================================================
--- 2.6.14-nlkd.orig/include/linux/cpu.h	2005-11-09 10:40:17.000000000 +0100
+++ 2.6.14-nlkd/include/linux/cpu.h	2005-11-04 16:19:34.000000000 +0100
@@ -42,6 +42,10 @@ struct notifier_block;
 extern int register_cpu_notifier(struct notifier_block *nb);
 extern void unregister_cpu_notifier(struct notifier_block *nb);
 
+#ifndef MODULE
+extern int cpu_notify(unsigned long);
+#endif
+
 int cpu_up(unsigned int cpu);
 
 #else
Index: 2.6.14-nlkd/include/linux/notifier.h
===================================================================
--- 2.6.14-nlkd.orig/include/linux/notifier.h	2005-11-09 10:40:17.000000000 +0100
+++ 2.6.14-nlkd/include/linux/notifier.h	2005-11-04 16:19:34.000000000 +0100
@@ -65,12 +65,14 @@ extern int notifier_call_chain(struct no
 
 #define NETLINK_URELEASE	0x0001	/* Unicast netlink socket released */
 
+#define CPU_ALIVE		0x0001 /* current CPU is alive */
 #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_DOWN_PREPARE	0x0005 /* CPU (unsigned)v going down */
 #define CPU_DOWN_FAILED		0x0006 /* CPU (unsigned)v NOT going down */
 #define CPU_DEAD		0x0007 /* CPU (unsigned)v dead */
+#define CPU_DYING		0x0008 /* current CPU dying */
 
 #endif /* __KERNEL__ */
 #endif /* _LINUX_NOTIFIER_H */
Index: 2.6.14-nlkd/kernel/cpu.c
===================================================================
--- 2.6.14-nlkd.orig/kernel/cpu.c	2005-11-09 10:40:17.000000000 +0100
+++ 2.6.14-nlkd/kernel/cpu.c	2005-11-04 16:19:34.000000000 +0100
@@ -41,6 +41,12 @@ void unregister_cpu_notifier(struct noti
 }
 EXPORT_SYMBOL(unregister_cpu_notifier);
 
+int cpu_notify(unsigned long event)
+{
+	return notifier_call_chain(&cpu_chain, event,
+	                           (void *)(long)smp_processor_id());
+}
+
 #ifdef CONFIG_HOTPLUG_CPU
 static inline void check_for_tasks(int cpu)
 {