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Date:	Tue, 6 Oct 2015 02:51:36 -0700
From:	Christoph Hellwig <>
To:	Nishanth Aravamudan <>
Cc:	Matthew Wilcox <>,
	Keith Busch <>,
	Benjamin Herrenschmidt <>,
	Paul Mackerras <>,
	Michael Ellerman <>,
	Alexey Kardashevskiy <>,
	David Gibson <>,
	Christoph Hellwig <>,,,
Subject: Re: [PATCH 1/5 v2] dma-mapping: add generic dma_get_page_shift API

Do we need a function here or can we just have a IOMMU_PAGE_SHIFT define
with an #ifndef in common code?

Also not all architectures use dma-mapping-common.h yet, so you either
need to update all of those as well, or just add the #ifndef directly
to linux/dma-mapping.h.
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