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Date: Tue, 25 Aug 2015 22:15:32 +0200
From: Christoph Hellwig <hch@lst.de>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Chris Zankel <chris@zankel.net>, Max Filippov <jcmvbkbc@gmail.com>,
        Christoph Hellwig <hch@lst.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-xtensa@linux-xtensa.org, linux-kernel@vger.kernel.org
Subject: Re: xtensa build failures in -next due to DMA API changes
Message-ID: <20150825201532.GA24940@lst.de>
References: <20150825200756.GA25409@roeck-us.net>
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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>