--- zzzz-none-000/linux-4.1.38/arch/arm/include/asm/dma-mapping.h	2017-01-18 18:48:06.000000000 +0000
+++ bcm63-7582-715/linux-4.1.38/arch/arm/include/asm/dma-mapping.h	2020-11-25 10:06:48.000000000 +0000
@@ -56,14 +56,14 @@
  * 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)
 {
 	if (dev)
 		pfn -= dev->dma_pfn_offset;
 	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)
 {
 	unsigned long pfn = __bus_to_pfn(addr);
 
@@ -73,7 +73,7 @@
 	return pfn;
 }
 
-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)
 {
 	if (dev) {
 		unsigned long pfn = dma_to_pfn(dev, addr);
@@ -84,7 +84,7 @@
 	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)
 {
 	if (dev)
 		return pfn_to_dma(dev, virt_to_pfn(addr));
@@ -165,29 +165,29 @@
 	return 1;
 }
 
-static inline void dma_mark_clean(void *addr, size_t size) { }
+static inline void dma_mark_clean(void *addr __maybe_unused, size_t size __maybe_unused) { }
 
 /*
  * DMA errors are defined by all-bits-set in the DMA address.
  */
-static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+static inline int dma_mapping_error(struct device *dev __maybe_unused, dma_addr_t dma_addr)
 {
 	debug_dma_mapping_error(dev, dma_addr);
-	return dma_addr == DMA_ERROR_CODE;
+	return dma_addr == (unsigned int)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)
 {
 }