[PATCH] iommu: disable on !MMU builds

[Joerg Roedel]

On Wed, Jan 28, 2015 at 03:45:53PM +0100, Arnd Bergmann wrote:
> A lot of the IOMMU support code does not build if the CPU does
> not have an MMU itself, and it's not clear if there is any
> use case for it, so let's just disable it and wait for anybody
> to need it.
> 
> This avoids randconfig errors like
> 
> ../arch/arm/mm/dma-mapping.c: In function '__iommu_alloc_remap':
> ../arch/arm/mm/dma-mapping.c:1278:34: error: 'VM_ARM_DMA_CONSISTENT' undeclared (first use in this function)
>   area = get_vm_area_caller(size, VM_ARM_DMA_CONSISTENT | VM_USERMAP,
>                                   ^
> ../arch/arm/mm/dma-mapping.c:1278:34: note: each undeclared identifier is reported only once for each function it appears in
> ../arch/arm/mm/dma-mapping.c: In function '__atomic_get_pages':
> ../arch/arm/mm/dma-mapping.c:1358:27: error: 'atomic_pool' undeclared (first use in this function)
>   struct dma_pool *pool = &atomic_pool;
> 
> Signed-off-by: Arnd Bergmann <arnd at arndb.de>

Applied to core branch, thanks.