Add a missing cpu hotplug lock to the 64bit mce code

TBD: causes lockdep inversion warnings. disabled for now

Signed-off-by: Andi Kleen <ak@suse.de>

---
 arch/x86/kernel/cpu/mcheck/mce_64.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux/arch/x86/kernel/cpu/mcheck/mce_64.c
===================================================================
--- linux.orig/arch/x86/kernel/cpu/mcheck/mce_64.c
+++ linux/arch/x86/kernel/cpu/mcheck/mce_64.c
@@ -933,6 +933,7 @@ static __init int mce_init_device(void)
 	if (err)
 		return err;
 
+	lock_cpu_hotplug();
 	for_each_online_cpu(i) {
 		err = mce_create_device(i);
 		if (err)
@@ -940,6 +941,7 @@ static __init int mce_init_device(void)
 	}
 
 	register_hotcpu_notifier(&mce_cpu_notifier);
+	unlock_cpu_hotplug();
 	misc_register(&mce_log_device);
 	return err;
 }