[PATCH] KDB x86_64 should use register_die_notifier

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I was working on KDB and ran into a problem on initialization on x86_64.
There's some magic that happens with register_die_notifier to make it
work correctly.  die_chain should not be directly accessed.  KDB should
go through register_die_notifier.

Signed-off-by: Corey Minyard <cminyard at mvista.com>

Index: linux-2.6.21/arch/x86_64/kdb/kdbasupport.c
--- linux-2.6.21.orig/arch/x86_64/kdb/kdbasupport.c
+++ linux-2.6.21/arch/x86_64/kdb/kdbasupport.c
@@ -915,7 +915,7 @@ kdba_init(void)
 	kdb_register("pt_regs", kdba_pt_regs, "address", "Format struct pt_regs", 0);
 	kdb_register("cpu_pda", kdba_cpu_pda, "<cpu>", "Format struct cpu_pda", 0);
-	atomic_notifier_chain_register(&die_chain, &kdba_notifier);
+	register_die_notifier(&kdba_notifier);

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