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

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Message-ID: <20151028015255.GG7716@linux.vnet.ibm.com>
Date:	Tue, 27 Oct 2015 18:52:55 -0700
From:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
To:	David Miller <davem@...emloft.net>
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

On 27.10.2015 [17:53:22 -0700], David Miller wrote:
> 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.

For my own edification -- what is the way that gets resolved? I guess I
mean it seems like linux-next would cease to compile because of my new
series. Would my patches just get kicked out of -next for introducing
that (or even via the 0-day notifications), or should I put something
into the commit message indicating it is an API introduction?

Sorry for the tentativeness, I have not introduce a cross-architecture
API like this before.

Thanks,
Nish

> 

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