From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754755AbbJ1Ags (ORCPT ); Tue, 27 Oct 2015 20:36:48 -0400 Received: from shards.monkeyblade.net ([149.20.54.216]:44119 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751116AbbJ1Agr (ORCPT ); Tue, 27 Oct 2015 20:36:47 -0400 Date: Tue, 27 Oct 2015 17:53:22 -0700 (PDT) Message-Id: <20151027.175322.247163553940004154.davem@davemloft.net> To: nacc@linux.vnet.ibm.com Cc: willy@linux.intel.com, keith.busch@intel.com, benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, aik@ozlabs.ru, david@gibson.dropbear.id.au, hch@infradead.org, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org Subject: Re: [PATCH 0/5 v3] Fix NVMe driver support on Power with 32-bit DMA From: David Miller In-Reply-To: <20151027222010.GD7716@linux.vnet.ibm.com> References: <20151023205420.GA10197@linux.vnet.ibm.com> <20151026.182746.1323901353520152838.davem@davemloft.net> <20151027222010.GD7716@linux.vnet.ibm.com> X-Mailer: Mew version 6.4 on Emacs 23.4 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Tue, 27 Oct 2015 17:36:46 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nishanth Aravamudan 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.