--- zzzz-none-000/linux-3.10.107/arch/mips/include/asm/mach-ip32/dma-coherence.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/mips/include/asm/mach-ip32/dma-coherence.h	2021-02-04 17:41:59.000000000 +0000
@@ -80,15 +80,8 @@
 	return 1;
 }
 
-static inline void plat_extra_sync_for_device(struct device *dev)
+static inline void plat_post_dma_flush(struct device *dev)
 {
-	return;
-}
-
-static inline int plat_dma_mapping_error(struct device *dev,
-					 dma_addr_t dma_addr)
-{
-	return 0;
 }
 
 static inline int plat_device_is_coherent(struct device *dev)