linux-kernel - Re: xtensa build failures in -next due to DMA API changes

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Message-ID: <20150825201532.GA24940@lst.de>
Date:	Tue, 25 Aug 2015 22:15:32 +0200
From:	Christoph Hellwig <hch@....de>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Chris Zankel <chris@...kel.net>, Max Filippov <jcmvbkbc@...il.com>,
	Christoph Hellwig <hch@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-xtensa@...ux-xtensa.org, linux-kernel@...r.kernel.org
Subject: Re: xtensa build failures in -next due to DMA API changes

Hi Guenter,

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

xtensa doesn't use the generic dma map implementation, so it shouldn't
include dma-mapping-common.h anywhere, and in my tree it doesn't.

Can you do a git-grep for dma-mapping-common.h on the tree that you
see this error on?  Nothing but arch/*/include/asm/dma-mapping.h should
include it.  In my tree it's all fine:

Documentation/DMA-API-HOWTO.txt:   can use include/linux/asm-generic/dma-mapping-common.h. It's a
arch/alpha/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/arm/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/arm64/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/h8300/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/hexagon/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/ia64/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/microblaze/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/mips/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/openrisc/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/powerpc/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/s390/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/sh/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/sparc/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/tile/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/unicore32/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
arch/x86/include/asm/dma-mapping.h:#include <asm-generic/dma-mapping-common.h>
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