We can just use the default implementation.
Signed-off-by: Christoph Hellwig <h...@lst.de>
---
arch/arm/include/asm/dma-mapping.h | 2 ++
arch/arm/mm/dma-mapping-nommu.c | 4 ----
2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/arm/include/asm/dma-mapping.h
b/arch/arm/include/asm/dma-mapping.h
index 8436f6ade57d..965b7c846ecb 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -100,8 +100,10 @@ static inline unsigned long dma_max_pfn(struct device *dev)
extern void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
const struct iommu_ops *iommu, bool coherent);
+#ifdef CONFIG_MMU
#define arch_teardown_dma_ops arch_teardown_dma_ops
extern void arch_teardown_dma_ops(struct device *dev);
+#endif
/* do not use this function in a driver */
static inline bool is_device_dma_coherent(struct device *dev)
diff --git a/arch/arm/mm/dma-mapping-nommu.c b/arch/arm/mm/dma-mapping-nommu.c
index f448a0663b10..aa7aba302e76 100644
--- a/arch/arm/mm/dma-mapping-nommu.c
+++ b/arch/arm/mm/dma-mapping-nommu.c
@@ -237,7 +237,3 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base,
u64 size,
set_dma_ops(dev, dma_ops);
}
-
-void arch_teardown_dma_ops(struct device *dev)
-{
-}
--
2.18.0
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