void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction);
#else
-#define arch_dma_cache_sync NULL
+static inline void arch_dma_cache_sync(struct device *dev, void *vaddr,
+ size_t size, enum dma_data_direction direction)
+{
+}
#endif /* CONFIG_DMA_NONCOHERENT_CACHE_SYNC */
#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE