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xtensa build failures in -next due to DMA API changes

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Hi,

xtensa builds fail in -next (again) as follows.

In file included from include/linux/dma-mapping.h:86:0,
                 from include/asm-generic/pci-dma-compat.h:7,
		 from ./arch/xtensa/include/asm/pci.h:59,
		from include/linux/pci.h:1492,
		from arch/xtensa/kernel/platform.c:16:
./arch/xtensa/include/asm/dma-mapping.h:40:21:
	error: redefinition of ‘dma_alloc_attrs’

In file included from ./arch/xtensa/include/asm/dma-mapping.h:33:0,
                 from include/linux/dma-mapping.h:86,
		 from include/asm-generic/pci-dma-compat.h:7,
		from ./arch/xtensa/include/asm/pci.h:59,
		from include/linux/pci.h:1492,
		from arch/xtensa/kernel/platform.c:16:
include/asm-generic/dma-mapping-common.h:245:21:
	note: previous definition of ‘dma_alloc_attrs’ was here

and many similar errors; it looks like all dma attribute functions have been
redefined.

The problem seems to have been introduced with changes made by Christoph
Hellwig, coming in through Andrew's tree. Copying them here for comments.

Guenter
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Thread

xtensa build failures in -next due to DMA API changes Guenter Roeck <linux@roeck-us.net> - 2015-08-25 22:10 +0200
  Re: xtensa build failures in -next due to DMA API changes Christoph Hellwig <hch@lst.de> - 2015-08-25 22:20 +0200
    Re: xtensa build failures in -next due to DMA API changes Christoph Hellwig <hch@lst.de> - 2015-08-25 22:30 +0200
      Re: xtensa build failures in -next due to DMA API changes Max Filippov <jcmvbkbc@gmail.com> - 2015-08-26 10:00 +0200
        Re: xtensa build failures in -next due to DMA API changes Andrew Morton <akpm@linux-foundation.org> - 2015-08-26 10:00 +0200
          Re: xtensa build failures in -next due to DMA API changes Chris Zankel <chris@zankel.net> - 2015-08-26 20:00 +0200
        Re: xtensa build failures in -next due to DMA API changes Christoph Hellwig <hch@lst.de> - 2015-08-26 19:50 +0200
          Re: xtensa build failures in -next due to DMA API changes Chris Zankel <chris@zankel.net> - 2015-09-01 02:40 +0200
    Re: xtensa build failures in -next due to DMA API changes Andrew Morton <akpm@linux-foundation.org> - 2015-08-25 22:30 +0200
    Re: xtensa build failures in -next due to DMA API changes Guenter Roeck <linux@roeck-us.net> - 2015-08-25 22:30 +0200

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