linux-kernel - Re: FW: [PATCH] powerpc/mm: Export HPAGE

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Message-Id: <200902041631.39784.nickpiggin@yahoo.com.au>
Date:	Wed, 4 Feb 2009 16:31:38 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Roland Dreier <rdreier@...co.com>,
	Eli Cohen <eli@...lanox.co.il>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org
Subject: Re: FW: [PATCH] powerpc/mm: Export HPAGE_SHIFT

On Wednesday 04 February 2009 16:13:29 Andrew Morton wrote:
> On Wed, 04 Feb 2009 12:50:48 +1100 Benjamin Herrenschmidt 
> > Do the generic hugetlbfs code provides such an API ? If not, we may need
> > to add one.
>
> I think it's something like
>
> 	huge_page_size(page_hstate(page))

That would work if you have a page, yes. If you want to query which hugepage
sizes are available, then you probably want for_each_hstate() (which is only
within mm/hugetlb.c at the moment, but I have no objections to exporting it
and symbols it requires).

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