Re: [PATCH 16/67] powerpc: rename dma_direct_ to dma_nommu_
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- To: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
- Subject: Re: [PATCH 16/67] powerpc: rename dma_direct_ to dma_nommu_
- From: Christoph Hellwig <hch@xxxxxx>
- Date: Tue, 9 Jan 2018 16:38:26 +0100
- Cc: Christoph Hellwig <hch@xxxxxx>, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, Guan Xuetao <gxt@xxxxxxxxxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-c6x-dev@xxxxxxxxxxxxx, linux-hexagon@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-snps-arc@xxxxxxxxxxxxxxxxxxx, adi-buildroot-devel@xxxxxxxxxxxxxxxxxxxxx, linux-m68k@xxxxxxxxxxxxxxx, patches@xxxxxxxxxxxxxxxx, linux-metag@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, Michal Simek <monstr@xxxxxxxxx>, linux-parisc@xxxxxxxxxxxxxxx, linux-cris-kernel@xxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-alpha@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx
- In-reply-to: <20180104084930.GB3251@lst.de>
- References: <20171229081911.2802-1-hch@lst.de> <20171229081911.2802-17-hch@lst.de> <878tdgtwzp.fsf@concordia.ellerman.id.au> <20180104084930.GB3251@lst.de>
- User-agent: Mutt/1.5.17 (2007-11-01)
On Thu, Jan 04, 2018 at 09:49:30AM +0100, Christoph Hellwig wrote:
> On Tue, Jan 02, 2018 at 08:45:30PM +1100, Michael Ellerman wrote:
> > Christoph Hellwig <hch@xxxxxx> 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.
Michael, please suggest what name you want for the next iteration,
I don't want to hold up the series on a naming bikeshed.
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