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From: Roland Dreier <rdreier@cisco.com>
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Cc: Andrew Morton <akpm@linux-foundation.org>,
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Subject: Re: FW: [PATCH] powerpc/mm: Export HPAGE_SHIFT
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Date: Wed, 04 Feb 2009 13:31:43 -0800
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 > You should be able to find the head of a compound page using the
 > compound_head() inline, so try

 > 	PAGE_SIZE << compound_order(compound_head(page))

Thanks!  Looks like that should be exactly what we need.

 - R.