dma-mapping: Remove dma_mark_clean (again)

With IA-64 now gone, there are no users of the dma_mark_clean hook,
so we can retire it for good.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/c004927f01962726ff1dcf94d1b4efff84db805a.1767727673.git.robin.murphy@arm.com

Author: rmurphy-arm

include/linux/dma-map-ops.h

@@ -377,14 +377,6 @@ static inline void arch_dma_prep_coherent(struct page *page, size_t size)
 }
 #endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */
 
-#ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
-void arch_dma_mark_clean(phys_addr_t paddr, size_t size);
-#else
-static inline void arch_dma_mark_clean(phys_addr_t paddr, size_t size)
-{
-}
-#endif /* ARCH_HAS_DMA_MARK_CLEAN */
-
 void *arch_dma_set_uncached(void *addr, size_t size);
 void arch_dma_clear_uncached(void *addr, size_t size);
 

kernel/dma/Kconfig

@@ -47,12 +47,6 @@ config ARCH_HAS_DMA_SET_MASK
 config ARCH_HAS_DMA_WRITE_COMBINE
 	bool
 
-#
-# Select if the architectures provides the arch_dma_mark_clean hook
-#
-config ARCH_HAS_DMA_MARK_CLEAN
-	bool
-
 config DMA_DECLARE_COHERENT
 	bool
 

kernel/dma/direct.c

@@ -425,9 +425,6 @@ void dma_direct_sync_sg_for_cpu(struct device *dev,
 			arch_sync_dma_for_cpu(paddr, sg->length, dir);
 
 		swiotlb_sync_single_for_cpu(dev, paddr, sg->length, dir);
-
-		if (dir == DMA_FROM_DEVICE)
-			arch_dma_mark_clean(paddr, sg->length);
 	}
 
 	if (!dev_is_dma_coherent(dev))

kernel/dma/direct.h

@@ -75,9 +75,6 @@ static inline void dma_direct_sync_single_for_cpu(struct device *dev,
 	}
 
 	swiotlb_sync_single_for_cpu(dev, paddr, size, dir);
-
-	if (dir == DMA_FROM_DEVICE)
-		arch_dma_mark_clean(paddr, size);
 }
 
 static inline dma_addr_t dma_direct_map_phys(struct device *dev,