linux-kernel - Re: [PATCH 1/5 v2] dma-mapping: add generic dma_get_page

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Date:	Wed, 14 Oct 2015 08:39:00 -0700
From:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Matthew Wilcox <willy@...ux.intel.com>,
	Keith Busch <keith.busch@...el.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	David Gibson <david@...son.dropbear.id.au>,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 1/5 v2] dma-mapping: add generic dma_get_page_shift API

Hi Christoph,

On 12.10.2015 [14:06:51 -0700], Nishanth Aravamudan wrote:
> On 06.10.2015 [02:51:36 -0700], Christoph Hellwig wrote:
> > Do we need a function here or can we just have a IOMMU_PAGE_SHIFT define
> > with an #ifndef in common code?
> 
> On Power, since it's technically variable, we'd need a function. So are
> you suggesting define'ing it to a function just on Power and leaving it
> a constant elsewhere?
> 
> I noticed that sparc has a IOMMU_PAGE_SHIFT already, fwiw.

Sorry, I should have been more specific -- I'm ready to spin out a v3,
with a sparc-specific function.

Are you ok with leaving it a function for now (the only caller is in
NVMe obviously).

-Nish

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