--- zzzz-none-000/linux-4.4.271/arch/arm/include/asm/dma-mapping.h	2021-06-03 06:22:09.000000000 +0000
+++ maple-fsgw-759/linux-4.4.271/arch/arm/include/asm/dma-mapping.h	2023-12-20 10:37:00.000000000 +0000
@@ -17,14 +17,14 @@
 extern struct dma_map_ops arm_dma_ops;
 extern struct dma_map_ops arm_coherent_dma_ops;
 
-static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *__generic_dma_ops(struct device *dev)
 {
 	if (dev && dev->archdata.dma_ops)
 		return dev->archdata.dma_ops;
 	return &arm_dma_ops;
 }
 
-static inline struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
 {
 	if (xen_initial_domain())
 		return xen_dma_ops;
@@ -32,7 +32,8 @@
 		return __generic_dma_ops(dev);
 }
 
-static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
+static inline void set_dma_ops(struct device *dev,
+					const struct dma_map_ops *ops)
 {
 	BUG_ON(!dev);
 	dev->archdata.dma_ops = ops;
@@ -125,7 +126,7 @@
 
 #define arch_setup_dma_ops arch_setup_dma_ops
 extern void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
-			       struct iommu_ops *iommu, bool coherent);
+			       const struct iommu_ops *iommu, bool coherent);
 
 #define arch_teardown_dma_ops arch_teardown_dma_ops
 extern void arch_teardown_dma_ops(struct device *dev);