[PATCH] small fixes to 3.3 (and 3.2) CPU hotplug code. (v1)

[Konrad Rzeszutek Wilk]

While I was playing with 'xm vcpu-set X N' I realized that the VCPU hotplug
code in 3.2 spews tons of messages. Found out that we were missing an preempt_*
call. While at it, I fixed also an annoying message ("XENBUS: Unable to ..")
that shows up during bootup.

Anyhow, these are going for 3.3 and CC-ing stable on the:
 [PATCH 1/2] xen/smp: Fix CPU online/offline bug triggering a BUG:

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