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Subject: Re: [RFC V1] cpuidle: add idle routine registration and cleanup
 pm_idle pointer
From: Peter Zijlstra <peterz@infradead.org>
To: Arjan van de Ven <arjan@linux.intel.com>
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Date: Wed, 20 Oct 2010 21:28:43 +0200
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On Wed, 2010-10-20 at 12:25 -0700, Arjan van de Ven wrote:
> (the pm_idle is an x86 only problem. other architectures should be able 
> to keep doing what they are doing) 

sadly no, some architectures copied this brilliant piece of design.

A quick git grep suggests:
arm/blackfin/cris/ia64/m32r/m68knommu/microblaze/mn10300/sh/sparc all
have pm_idle.