linux-kernel - Re: [PATCH -mm 2/5] asm-generic: add NEED_SG_DMA_LENGTH to define sg_dma

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Message-Id: <20100405163541.aa10c605.akpm@linux-foundation.org>
Date:	Mon, 5 Apr 2010 16:35:41 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	linux-kernel@...r.kernel.org, arnd@...db.de
Subject: Re: [PATCH -mm 2/5] asm-generic: add NEED_SG_DMA_LENGTH to define
 sg_dma_len()

On Sun,  4 Apr 2010 23:25:50 +0900
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:

> There are only two ways to define sg_dma_len(); use sg->dma_length or
> sg->length. This patch introduces NEED_SG_DMA_LENGTH that enables
> architectures to choose sg->dma_length or sg->length.

i386 allnoconfig:

arch/x86/kernel/pci-nommu.c: In function 'nommu_map_sg':
arch/x86/kernel/pci-nommu.c:71: error: 'struct scatterlist' has no member named 'dma_length'

So I enabled NEED_SG_DMA_LENGTH on x86_32 as well.  It compiles...

--- a/arch/x86/Kconfig~asm-generic-add-need_sg_dma_length-to-define-sg_dma_len-fix
+++ a/arch/x86/Kconfig
@@ -103,7 +103,7 @@ config NEED_DMA_MAP_STATE
        def_bool (X86_64 || DMAR || DMA_API_DEBUG)
 
 config NEED_SG_DMA_LENGTH
-	def_bool X86_64
+	def_bool y
 
 config GENERIC_ISA_DMA
 	def_bool y
diff -puN include/asm-generic/scatterlist.h~asm-generic-add-need_sg_dma_length-to-define-sg_dma_len-fix include/asm-generic/scatterlist.h
_

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