Re: [PATCHv7 3/5] common: dma-mapping: Introduce common remapping functions

[Laura Abbott <lauraa@codeaurora.org>]

On 8/26/2014 3:05 AM, James Hogan wrote:
> On 12 August 2014 00:40, Laura Abbott <lauraa@codeaurora.org> wrote:
>>
>> For architectures without coherent DMA, memory for DMA may
>> need to be remapped with coherent attributes. Factor out
>> the the remapping code from arm and put it in a
>> common location to reduce code duplication.
>>
>> As part of this, the arm APIs are now migrated away from
>> ioremap_page_range to the common APIs which use map_vm_area for remapping.
>> This should be an equivalent change and using map_vm_area is more
>> correct as ioremap_page_range is intended to bring in io addresses
>> into the cpu space and not regular kernel managed memory.
>>
>> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
>> Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
> 
> This commit in linux-next () breaks the build for metag:
> 
> drivers/base/dma-mapping.c: In function a??dma_common_contiguous_remapa??:
> drivers/base/dma-mapping.c:294: error: implicit declaration of
> function a??dma_common_pages_remapa??
> drivers/base/dma-mapping.c:294: warning: assignment makes pointer from
> integer without a cast
> drivers/base/dma-mapping.c: At top level:
> drivers/base/dma-mapping.c:308: error: conflicting types for
> a??dma_common_pages_remapa??
> drivers/base/dma-mapping.c:294: error: previous implicit declaration
> of a??dma_common_pages_remapa?? was here
> 
> Looks like metag isn't alone either:
> 
> $ git grep -L dma-mapping-common arch/*/include/asm/dma-mapping.h
> arch/arc/include/asm/dma-mapping.h
> arch/avr32/include/asm/dma-mapping.h
> arch/blackfin/include/asm/dma-mapping.h
> arch/c6x/include/asm/dma-mapping.h
> arch/cris/include/asm/dma-mapping.h
> arch/frv/include/asm/dma-mapping.h
> arch/m68k/include/asm/dma-mapping.h
> arch/metag/include/asm/dma-mapping.h
> arch/mn10300/include/asm/dma-mapping.h
> arch/parisc/include/asm/dma-mapping.h
> arch/xtensa/include/asm/dma-mapping.h
> 
> I've checked a couple of these arches (blackfin, xtensa) which don't
> include dma-mapping-common.h and their builds seem to be broken too.
> 
> Cheers
> James
> 

Thanks for the report. Would you mind giving the following patch
a test (this is theoretical only but I think it should work)

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