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

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Message-ID: <20151027223643.GA25332@localhost.localdomain>
Date:	Tue, 27 Oct 2015 22:36:43 +0000
From:	"Busch, Keith" <keith.busch@...el.com>
To:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
Cc:	David Miller <davem@...emloft.net>, willy@...ux.intel.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

On Tue, Oct 27, 2015 at 03:20:10PM -0700, Nishanth Aravamudan wrote:
> On 26.10.2015 [18:27:46 -0700], David Miller wrote:
> > From: Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
> > Date: Fri, 23 Oct 2015 13:54:20 -0700
> > 
> > > 1) add a generic dma_get_page_shift implementation that just returns
> > > PAGE_SHIFT
> > 
> > I won't object to this patch series, but if I had implemented this I
> > would have required the architectures to implement this explicitly,
> > one-by-one.  I think it is less error prone and more likely to end
> > up with all the architectures setting this correctly.
> 
> 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!

If you're suggesting to compile-time break architectures that currently
work just fine with NVMe, let me stop you right there.
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