We now made get_freelist() *require* interrupts to be disabled which
deserves a comment, no?

I resend patch(18 May) related to this comment.
See below link.
http://thread.gmane.org/gmane.linux.kernel.mm/78630/focus=78701

Also, what do we gain from patches like this? It's somewhat
counterintuitive that we have a function with "cmpxchg" in it which is not
always atomic (i.e. you need to have interrupts disabled).

Hmm...
This patch have a minor impact which saves a few instructions.
But we already have a "__cmpxchg" version which works in irq disabled,
so there is no reason for not applying it.

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