From: Christoph Hellwig Subject: Re: [PATCH 16/67] powerpc: rename dma_direct_ to dma_nommu_ Date: Thu, 4 Jan 2018 09:49:30 +0100 Message-ID: <20180104084930.GB3251@lst.de> References: <20171229081911.2802-1-hch@lst.de> <20171229081911.2802-17-hch@lst.de> <878tdgtwzp.fsf@concordia.ellerman.id.au> Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: <878tdgtwzp.fsf@concordia.ellerman.id.au> Sender: linux-hexagon-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Michael Ellerman Cc: Christoph Hellwig , iommu@lists.linux-foundation.org, linux-mips@linux-mips.org, linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, Guan Xuetao , linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, linux-c6x-dev@linux-c6x.org, linux-hexagon@vger.kernel.org, x86@kernel.org, linux-snps-arc@lists.infradead.org, adi-buildroot-devel@lists.sourceforge.net, linux-m68k@lists.linux-m68k.org, patches@groups.riscv.org, linux-metag@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Michal Simek , linux-parisc@vger.kernel.org, linux-cris-kernel@axis.com, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linuxppc-dev@lists.ozlabs.org On Tue, Jan 02, 2018 at 08:45:30PM +1100, Michael Ellerman wrote: > Christoph Hellwig writes: > > > We want to use the dma_direct_ namespace for a generic implementation, > > so rename powerpc to the second best choice: dma_nommu_. > > I'm not a fan of "nommu". Some of the users of direct ops *are* using an > IOMMU, they're just setting up a 1:1 mapping once at init time, rather > than mapping dynamically. > > Though I don't have a good idea for a better name, maybe "1to1", > "linear", "premapped" ? It seems like a nice counter part to the dma_iommu_ops used just about anywhere else in ppc. But I'll happily take any maintainer bike shed decision for the next series. Remember that in a merge window or two it will hopefully go away in favor of the new generic dma_direct ops.