iommu: disable on !MMU builds
PATCH 1/1 iommu: disable on !MMU builds
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;
drivers/iommu/Kconfig +5 -3
@@ -4,6 +4,7 @@ config IOMMU_API menuconfig IOMMU_SUPPORT bool "IOMMU Hardware Support" + depends on MMU default y ---help--- Say Y here if you want to compile device drivers for IO Memory
@@ -170,7 +171,7 @@ config IRQ_REMAP # OMAP IOMMU support config OMAP_IOMMU bool "OMAP IOMMU Support" - depends on ARCH_OMAP2PLUS + depends on ARCH_OMAP2PLUS && MMU select IOMMU_API config OMAP_IOMMU_DEBUG
@@ -217,7 +218,7 @@ config TEGRA_IOMMU_SMMU config EXYNOS_IOMMU bool "Exynos IOMMU Support" - depends on ARCH_EXYNOS && ARM + depends on ARCH_EXYNOS && ARM && MMU select IOMMU_API select ARM_DMA_USE_IOMMU help
@@ -246,7 +247,7 @@ config SHMOBILE_IPMMU_TLB config SHMOBILE_IOMMU bool "IOMMU for Renesas IPMMU/IPMMUI" default n - depends on ARM + depends on ARM && MMU depends on ARCH_SHMOBILE || COMPILE_TEST select IOMMU_API select ARM_DMA_USE_IOMMU
@@ -336,6 +337,7 @@ config SPAPR_TCE_IOMMU config ARM_SMMU bool "ARM Ltd. System MMU (SMMU) Support" depends on ARM64 || ARM + depends on MMU select IOMMU_API select IOMMU_IO_PGTABLE_LPAE select ARM_DMA_USE_IOMMU if ARM
PATCH 1/1 iommu: disable on !MMU builds
Quoted 10 lines · Arnd Bergmann
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,
Quoted 7 lines
^
../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)
structdma_pool*pool =&atomic_pool;Signed-off-by Arnd Bergmann <[email protected]>
Applied to core branch, thanks.