RE: [PATCH] x86, amd, mce: Prevent potential cpu-online oops

[Luck, Tony]

+		if (WARN_ON_ONCE(!nb))
+			goto out;
+

WARN_ON_ONCE() will drop a stack trace to the console - is that going to be useful?

If you want a message perhaps:

		if (!nb) {
			printk_once("something interesting about not having access to north bridge\n")
			goto out;
		}

-Tony
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