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Message-ID: <20070531085307.15a9bbc8@gondolin.boeblingen.de.ibm.com>
Date: Thu, 31 May 2007 08:53:07 +0200
From: Cornelia Huck <cornelia.huck@...ibm.com>
To: "Williams, Dan J" <dan.j.williams@...el.com>
Cc: "Heiko Carstens" <heiko.carstens@...ibm.com>,
"Andrew Morton" <akpm@...ux-foundation.org>,
"John W. Linville" <linville@...driver.com>,
"Kyle McMartin" <kyle@...isc-linux.org>,
<linux-kernel@...r.kernel.org>, <James.Bottomley@...eleye.com>,
"Tejun Heo" <htejun@...il.com>, "Jeff Garzik" <jeff@...zik.org>,
"Martin Schwidefsky" <schwidefsky@...ibm.com>,
<geert@...ux-m68k.org>, <zippel@...ux-m68k.org>, <spyro@....com>,
<uclinux-v850@....nec.co.jp>, <ysato@...rs.sourceforge.jp>
Subject: Re: [patch] Introduce CONFIG_HAS_DMA.
On Wed, 30 May 2007 14:40:02 -0700,
"Williams, Dan J" <dan.j.williams@...el.com> wrote:
> With the patch non-dma-architectures that try to build code with true
> dependencies on the DMA api will fail to link i.e.:
>
> CONFIG_DMA_ENGINE=y CONFIG_HAS_DMA=n ASYNC_MEMCPY=y
> CC init/version.o
> LD init/built-in.o
> LD .tmp_vmlinux1
> async_tx/built-in.o: In function `async_memcpy':
> xor.c:(.text+0x770): undefined reference to `dma_map_page'
> xor.c:(.text+0x798): undefined reference to `dma_map_page'
> xor.c:(.text+0x968): undefined reference to `dma_map_page'
>
> Now changing CONFIG_DMA_ENGINE to depend on HAS_DMA (which is more
> correct than saying !S390).
Makes sense.
> Results in:
> CONFIG_DMA_ENGINE=n CONFIG_HAS_DMA=n ASYNC_MEMCPY=y
> CC init/version.o
> LD init/built-in.o
> LD .tmp_vmlinux1
> KSYM .tmp_kallsyms1.S
> AS .tmp_kallsyms1.o
> LD .tmp_vmlinux2
> KSYM .tmp_kallsyms2.S
> AS .tmp_kallsyms2.o
> LD vmlinux
>
> This also allows include/asm-s390/dma-mapping.h to be dropped.
Cool. Thanks for looking into that.
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