linux-kernel - Re: [PATCH] dma-mapping-broken.h: flesh-out DMA API stubs

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Date:	Fri, 23 Feb 2007 10:50:40 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	"John W. Linville" <linville@...driver.com>
Cc:	linux-kernel@...r.kernel.org, James.Bottomley@...elEye.com,
	Tejun Heo <htejun@...il.com>, Jeff Garzik <jeff@...zik.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH] dma-mapping-broken.h: flesh-out DMA API stubs

On Fri, Feb 23, 2007 at 07:13:32AM +0100, Heiko Carstens wrote:
> How about this for telling that an architecture doesn't support DMA?
> At least we could get rid of dma-mapping-broken.h and don't need to
> compile some afterwards dead code.
> 
> Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
> ---
>  arch/s390/Kconfig              |    3 +++
>  drivers/base/Makefile          |    4 ++--
>  include/asm-s390/dma-mapping.h |    2 --
>  lib/Kconfig                    |    5 +++++
>  4 files changed, 10 insertions(+), 4 deletions(-)
> 
> Index: linux-2.6/arch/s390/Kconfig
> ===================================================================
> --- linux-2.6.orig/arch/s390/Kconfig
> +++ linux-2.6/arch/s390/Kconfig
> @@ -44,6 +44,9 @@ config GENERIC_TIME
>  config NO_IOMEM
>  	def_bool y
> 
> +config NO_DMA
> +	def_bool y
> +
>  mainmenu "Linux Kernel Configuration"
> 
>  config S390
> Index: linux-2.6/drivers/base/Makefile
> ===================================================================
> --- linux-2.6.orig/drivers/base/Makefile
> +++ linux-2.6/drivers/base/Makefile
> @@ -2,10 +2,10 @@
> 
>  obj-y			:= core.o sys.o bus.o dd.o \
>  			   driver.o class.o platform.o \
> -			   cpu.o firmware.o init.o map.o dmapool.o \
> -			   dma-mapping.o devres.o \
> +			   cpu.o firmware.o init.o map.o devres.o \
>  			   attribute_container.o transport_class.o
>  obj-y			+= power/
> +obj-$(CONFIG_DMA)	+= dma-mapping.o dmapool.o

This should have been CONFIG_HAS_DMA. Anyway I'm going to resend this one
if nobody objects.



>  obj-$(CONFIG_ISA)	+= isa.o
>  obj-$(CONFIG_FW_LOADER)	+= firmware_class.o
>  obj-$(CONFIG_NUMA)	+= node.o
> Index: linux-2.6/include/asm-s390/dma-mapping.h
> ===================================================================
> --- linux-2.6.orig/include/asm-s390/dma-mapping.h
> +++ linux-2.6/include/asm-s390/dma-mapping.h
> @@ -9,6 +9,4 @@
>  #ifndef _ASM_DMA_MAPPING_H
>  #define _ASM_DMA_MAPPING_H
> 
> -#include <asm-generic/dma-mapping-broken.h>
> -
>  #endif /* _ASM_DMA_MAPPING_H */
> Index: linux-2.6/lib/Kconfig
> ===================================================================
> --- linux-2.6.orig/lib/Kconfig
> +++ linux-2.6/lib/Kconfig
> @@ -111,4 +111,9 @@ config HAS_IOPORT
>  	depends on HAS_IOMEM && !NO_IOPORT
>  	default y
> 
> +config HAS_DMA
> +	boolean
> +	depends on !NO_DMA
> +	default y
> +
>  endmenu

-- 
Heiko Carstens
Linux on System z Development

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