Re: [PATCH 28/44] sparc: remove arch specific dma_supported implementations
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- To: Julian Calaby <julian.calaby@xxxxxxxxx>
- Subject: Re: [PATCH 28/44] sparc: remove arch specific dma_supported implementations
- From: Christoph Hellwig <hch@xxxxxx>
- Date: Fri, 16 Jun 2017 10:47:01 +0200
- Cc: Christoph Hellwig <hch@xxxxxx>, x86@xxxxxxxxxx, "Mailing List, Arm" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-c6x-dev@xxxxxxxxxxxxx, linux-hexagon@xxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxx, openrisc@xxxxxxxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, sparclinux <sparclinux@xxxxxxxxxxxxxxx>, linux-xtensa@xxxxxxxxxxxxxxxx, dmaengine@xxxxxxxxxxxxxxx, linux-tegra@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-samsung-soc@xxxxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, netdev <netdev@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>
- In-reply-to: <CAGRGNgUJ3J_LEwhJ1rFHuzZ_J4OnTV9-DekcuT=N5z1pBKcb3A@mail.gmail.com>
- References: <20170608132609.32662-1-hch@lst.de> <20170608132609.32662-29-hch@lst.de> <CAGRGNgUJ3J_LEwhJ1rFHuzZ_J4OnTV9-DekcuT=N5z1pBKcb3A@mail.gmail.com>
- User-agent: Mutt/1.5.17 (2007-11-01)
On Fri, Jun 09, 2017 at 12:22:48AM +1000, Julian Calaby wrote:
> I'm guessing there's a few places that have DMA ops but DMA isn't
> actually supported. Why not have a common method for this, maybe
> "dma_not_supported"?
It's not common at all. Except for sbus all dma API user first
call set_dma_mask which ends up in the dma_supported call. sbus
is the weird outlier here.
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