dma-mapping: add a kconfig symbol for arch_teardown_dma_ops availability

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com> # arm64

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index c1cf44f..4bb36ae 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -16,6 +16,7 @@ config ARM
        select ARCH_HAS_SET_MEMORY
        select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
        select ARCH_HAS_STRICT_MODULE_RWX if MMU
+       select ARCH_HAS_TEARDOWN_DMA_OPS if MMU
        select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
        select ARCH_HAVE_CUSTOM_GPIO_H
        select ARCH_HAS_GCOV_PROFILE_ALL

diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index a224b6e..03ba90f 100644 (file)
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -96,11 +96,6 @@ static inline unsigned long dma_max_pfn(struct device *dev)
 }
 #define dma_max_pfn(dev) dma_max_pfn(dev)
 
-#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/arm64/Kconfig b/arch/arm64/Kconfig
index 63909f3..87ec7be 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -29,6 +29,7 @@ config ARM64
        select ARCH_HAS_SYNC_DMA_FOR_DEVICE
        select ARCH_HAS_SYNC_DMA_FOR_CPU
        select ARCH_HAS_SYSCALL_WRAPPER
+       select ARCH_HAS_TEARDOWN_DMA_OPS if IOMMU_SUPPORT
        select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
        select ARCH_HAVE_NMI_SAFE_CMPXCHG
        select ARCH_INLINE_READ_LOCK if !PREEMPT

diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
index de96507..de98191 100644 (file)
--- a/arch/arm64/include/asm/dma-mapping.h
+++ b/arch/arm64/include/asm/dma-mapping.h
@@ -29,11 +29,6 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
        return NULL;
 }
 
-#ifdef CONFIG_IOMMU_DMA
-void arch_teardown_dma_ops(struct device *dev);
-#define arch_teardown_dma_ops  arch_teardown_dma_ops
-#endif
-
 /*
  * Do not use this function in a driver, it is only provided for
  * arch/arm/mm/xen.c, which is used by arm64 as well.

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 2b20d60..4210c5c 100644 (file)
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -681,9 +681,13 @@ static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
 }
 #endif /* CONFIG_ARCH_HAS_SETUP_DMA_OPS */
 
-#ifndef arch_teardown_dma_ops
-static inline void arch_teardown_dma_ops(struct device *dev) { }
-#endif
+#ifdef CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS
+void arch_teardown_dma_ops(struct device *dev);
+#else
+static inline void arch_teardown_dma_ops(struct device *dev)
+{
+}
+#endif /* CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS */
 
 static inline unsigned int dma_get_max_seg_size(struct device *dev)
 {

diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 6014cad..bde9179 100644 (file)
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -22,6 +22,9 @@ config HAVE_GENERIC_DMA_COHERENT
 config ARCH_HAS_SETUP_DMA_OPS
        bool
 
+config ARCH_HAS_TEARDOWN_DMA_OPS
+       bool
+
 config ARCH_HAS_SYNC_DMA_FOR_DEVICE
        bool