A mechanism to allow debuggers to intercept panic events early.

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

Index: 2.6.14-nlkd/include/linux/kernel.h
===================================================================
--- 2.6.14-nlkd.orig/include/linux/kernel.h	2005-11-09 10:40:17.000000000 +0100
+++ 2.6.14-nlkd/include/linux/kernel.h	2005-11-04 16:19:34.000000000 +0100
@@ -86,6 +86,7 @@ extern int cond_resched(void);
 	})
 
 extern struct notifier_block *panic_notifier_list;
+extern struct notifier_block *prepanic_notifier_list;
 extern long (*panic_blink)(long time);
 NORET_TYPE void panic(const char * fmt, ...)
 	__attribute__ ((NORET_AND format (printf, 1, 2)));
Index: 2.6.14-nlkd/kernel/panic.c
===================================================================
--- 2.6.14-nlkd.orig/kernel/panic.c	2005-11-09 10:40:17.000000000 +0100
+++ 2.6.14-nlkd/kernel/panic.c	2005-11-04 16:19:34.000000000 +0100
@@ -27,8 +27,10 @@ int tainted;
 EXPORT_SYMBOL(panic_timeout);
 
 struct notifier_block *panic_notifier_list;
+struct notifier_block *prepanic_notifier_list;
 
 EXPORT_SYMBOL(panic_notifier_list);
+EXPORT_SYMBOL(prepanic_notifier_list);
 
 static int __init panic_setup(char *str)
 {
@@ -76,6 +78,7 @@ NORET_TYPE void panic(const char * fmt, 
 	vsnprintf(buf, sizeof(buf), fmt, args);
 	va_end(args);
 	printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
+	notifier_call_chain(&prepanic_notifier_list, 0, buf);
 	bust_spinlocks(0);
 
 	/*