--- zzzz-none-000/linux-3.10.107/arch/arm/include/asm/dma-mapping.h	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/arch/arm/include/asm/dma-mapping.h	2021-11-10 11:53:52.000000000 +0000
@@ -45,22 +45,26 @@
  * addresses. They must not be used by drivers.
  */
 #ifndef __arch_pfn_to_dma
-static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
+static inline dma_addr_t pfn_to_dma(struct device *dev __maybe_unused,
+				    unsigned long pfn)
 {
 	return (dma_addr_t)__pfn_to_bus(pfn);
 }
 
-static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
+static inline unsigned long dma_to_pfn(struct device *dev __maybe_unused,
+				       dma_addr_t addr)
 {
 	return __bus_to_pfn(addr);
 }
 
-static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
+static inline void *dma_to_virt(struct device *dev __maybe_unused,
+				dma_addr_t addr)
 {
 	return (void *)__bus_to_virt((unsigned long)addr);
 }
 
-static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
+static inline dma_addr_t virt_to_dma(struct device *dev __maybe_unused,
+				     void *addr)
 {
 	return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
 }
@@ -92,21 +96,25 @@
 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
 	debug_dma_mapping_error(dev, dma_addr);
-	return dma_addr == DMA_ERROR_CODE;
+	return dma_addr == (dma_addr_t)DMA_ERROR_CODE;
 }
 
 /*
  * Dummy noncoherent implementation.  We don't provide a dma_cache_sync
  * function so drivers using this API are highlighted with build warnings.
  */
-static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
-		dma_addr_t *handle, gfp_t gfp)
+static inline void *dma_alloc_noncoherent(struct device *dev __maybe_unused,
+					  size_t size __maybe_unused,
+					  dma_addr_t * handle __maybe_unused,
+					  gfp_t gfp __maybe_unused)
 {
 	return NULL;
 }
 
-static inline void dma_free_noncoherent(struct device *dev, size_t size,
-		void *cpu_addr, dma_addr_t handle)
+static inline void dma_free_noncoherent(struct device *dev __maybe_unused,
+					size_t size __maybe_unused,
+					void *cpu_addr __maybe_unused,
+					dma_addr_t handle __maybe_unused)
 {
 }