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SubjectRE: [PATCH 3/6] x86-mce: Clear CMCI enable on all claimed CMCI banks before reboot.
+	if (!xchg(&reboot_notifier_registered, true))
+ register_reboot_notifier(&cmci_reboot_notifier);

This is super-safe ... but isn't the xchg() overkill? I thought we serialized bringup
of other cpus.

Has this "do it once" caught on elsewhere in the kernel ... I suppose it is more concise than

if (!reboot_notifier_registered) {
reboot_notifier_registered = 1;


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