linux-kernel - Re: [PATCH] arm: dma-mapping: fix compilation error when CONFIG

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Date:	Mon, 20 Oct 2014 17:05:25 -0700
From:	Laura Abbott <lauraa@...eaurora.org>
To:	Stefan Hengelein <stefan.hengelein@....de>,
	Marek Szyprowski <m.szyprowski@...sung.com>
CC:	linux-kernel@...r.kernel.org, linux@....linux.org.uk,
	akpm@...ux-foundation.org, linux-arm-kernel@...ts.infradead.org,
	andreas.herrmann@...xeda.com,
	Valentin Rothberg <valentinrothberg@...il.com>
Subject: Re: [PATCH] arm: dma-mapping: fix compilation error when CONFIG_MMU
 is not present

On 10/20/2014 6:50 AM, Stefan Hengelein wrote:
> Well,
>
> arch/arm/mm/dma-mapping.c: In function ‘__atomic_get_pages’:
> arch/arm/mm/dma-mapping.c:1265:31: error: ‘atomic_pool’ undeclared
> (first use in this function)
>
> arch/arm/mm/dma-mapping.c: In function ‘__iommu_get_pages’:
> arch/arm/mm/dma-mapping.c:1275:2: error: implicit declaration of
> function ‘__in_atomic_pool’ [-Werror=implicit-function-declaration]
>
>
> others:
> arch/arm/mm/dma-mapping.c: In function ‘__iommu_alloc_remap’:
> arch/arm/mm/dma-mapping.c:1200:4: error: ‘VM_ARM_DMA_CONSISTENT’
> undeclared (first use in this function)
> arch/arm/mm/dma-mapping.c:1200:4: note: each undeclared identifier is
> reported only once for each function it appears in
>
> arch/arm/mm/dma-mapping.c: In function ‘__iommu_get_pages’:
> arch/arm/mm/dma-mapping.c:1282:29: error: ‘VM_ARM_DMA_CONSISTENT’
> undeclared (first use in this function)
> arch/arm/mm/dma-mapping.c: In function ‘arm_iommu_free_attrs’:
> arch/arm/mm/dma-mapping.c:1411:4: error: ‘VM_ARM_DMA_CONSISTENT’
> undeclared (first use in this function)
>
>
> i've attached a configuration where it happens.
> when you place the configuration in your tree and compile the file,
> the errors should show up.
>
> However, within the configuration CONFIG_ARM_DMA_USE_IOMMU is defined
> and CONFIG_MMU is not. AFAIUI, if both should be enabled together, it
> should be mapped in Kconfig somewhere, right?
>
> Best Regards,
> Stefan
>

There isn't a nice way to fixup the dma consistent flags so I would
say this option should just depend on MMU.

Thanks,
Laura

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