linux-kernel - Re: [PATCH 0/5 v3] Fix NVMe driver support on Power with 32-bit DMA

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Date:	Tue, 27 Oct 2015 17:53:22 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	nacc@...ux.vnet.ibm.com
Cc:	willy@...ux.intel.com, keith.busch@...el.com,
	benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
	aik@...abs.ru, david@...son.dropbear.id.au, hch@...radead.org,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH 0/5 v3] Fix NVMe driver support on Power with 32-bit DMA

From: Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
Date: Tue, 27 Oct 2015 15:20:10 -0700

> Well, looks like I should spin up a v4 anyways for the powerpc changes.
> So, to make sure I understand your point, should I make the generic
> dma_get_page_shift a compile-error kind of thing? It will only fail on
> architectures that actually build the NVME driver (as the only caller).
> But I'm not sure how exactly to achieve that, if you could give a bit
> more detail I'd appreciate it!

Yes, I am basically suggesting to simply not provide a default at all.
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