--- zzzz-none-000/linux-3.10.107/arch/mips/include/asm/mach-generic/dma-coherence.h	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/arch/mips/include/asm/mach-generic/dma-coherence.h	2021-11-10 11:53:53.000000000 +0000
@@ -11,30 +11,37 @@
 
 struct device;
 
-static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
-	size_t size)
+static inline dma_addr_t plat_map_dma_mem(struct device *dev __maybe_unused,
+					  void *addr,
+					  size_t size __maybe_unused)
 {
 	return virt_to_phys(addr);
 }
 
-static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
-	struct page *page)
+static inline dma_addr_t plat_map_dma_mem_page(struct device *dev
+					       __maybe_unused,
+					       struct page *page)
 {
 	return page_to_phys(page);
 }
 
-static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
-	dma_addr_t dma_addr)
+static inline unsigned long plat_dma_addr_to_phys(struct device *dev
+						  __maybe_unused,
+						  dma_addr_t dma_addr)
 {
 	return dma_addr;
 }
 
-static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
-	size_t size, enum dma_data_direction direction)
+static inline void plat_unmap_dma_mem(struct device *dev __maybe_unused,
+				      dma_addr_t dma_addr __maybe_unused,
+				      size_t size __maybe_unused,
+				      enum dma_data_direction direction
+				      __maybe_unused)
 {
 }
 
-static inline int plat_dma_supported(struct device *dev, u64 mask)
+static inline int plat_dma_supported(struct device *dev __maybe_unused,
+				     u64 mask)
 {
 	/*
 	 * we fall back to GFP_DMA when the mask isn't all 1s,
@@ -47,17 +54,17 @@
 	return 1;
 }
 
-static inline void plat_extra_sync_for_device(struct device *dev)
+static inline void plat_extra_sync_for_device(struct device *dev __maybe_unused)
 {
 }
 
-static inline int plat_dma_mapping_error(struct device *dev,
-					 dma_addr_t dma_addr)
+static inline int plat_dma_mapping_error(struct device *dev __maybe_unused,
+					 dma_addr_t dma_addr __maybe_unused)
 {
 	return 0;
 }
 
-static inline int plat_device_is_coherent(struct device *dev)
+static inline int plat_device_is_coherent(struct device *dev __maybe_unused)
 {
 #ifdef CONFIG_DMA_COHERENT
 	return 1;