diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index ae12f8dc05a5..03154f892a56 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -803,31 +803,15 @@ static inline int dma_get_cache_alignment(void)
 }
 
 #ifdef CONFIG_DMA_DECLARE_COHERENT
-struct dma_coherent_mem;
 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 				dma_addr_t device_addr, size_t size);
-dma_addr_t dma_get_device_base(struct device *dev,
-			       struct dma_coherent_mem *mem);
-unsigned long dma_get_size(struct dma_coherent_mem *mem);
 #else
-struct dma_coherent_mem {};
 static inline int
 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 			    dma_addr_t device_addr, size_t size)
 {
 	return -ENOSYS;
 }
-
-static inline dma_addr_t dma_get_device_base(struct device *dev,
-					     struct dma_coherent_mem *mem)
-{
-	return 0;
-}
-
-static inline unsigned long dma_get_size(struct dma_coherent_mem *mem)
-{
-	return 0;
-}
 #endif /* CONFIG_DMA_DECLARE_COHERENT */
 
 static inline void *dmam_alloc_coherent(struct device *dev, size_t size,
diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c
index 19d788e03e71..545e3869b0e3 100644
--- a/kernel/dma/coherent.c
+++ b/kernel/dma/coherent.c
@@ -28,7 +28,7 @@ static inline struct dma_coherent_mem *dev_get_coherent_memory(struct device *de
 	return NULL;
 }
 
-dma_addr_t dma_get_device_base(struct device *dev,
+static inline dma_addr_t dma_get_device_base(struct device *dev,
 					     struct dma_coherent_mem * mem)
 {
 	if (mem->use_dev_dma_pfn_offset)
@@ -37,11 +37,6 @@ dma_addr_t dma_get_device_base(struct device *dev,
 		return mem->device_base;
 }
 
-unsigned long dma_get_size(struct dma_coherent_mem *mem)
-{
-	return mem->size << PAGE_SHIFT;
-}
-
 static int dma_init_coherent_memory(phys_addr_t phys_addr,
 		dma_addr_t device_addr, size_t size,
 		struct dma_coherent_mem **mem)