linux-kernel - [PATCH 07/34] powerpc/dma: remove the no-op dma_nommu_unmap

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Date:   Wed, 14 Nov 2018 09:22:47 +0100
From:   Christoph Hellwig <hch@....de>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org, iommu@...ts.linux-foundation.org,
        linux-mm@...ck.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 07/34] powerpc/dma: remove the no-op dma_nommu_unmap_{page,sg} routines

These methods are optional, no need to implement no-op versions.

Signed-off-by: Christoph Hellwig <hch@....de>
Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
---
 arch/powerpc/kernel/dma.c | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index d6deb458bb91..7078d72baec2 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -197,12 +197,6 @@ static int dma_nommu_map_sg(struct device *dev, struct scatterlist *sgl,
 	return nents;
 }
 
-static void dma_nommu_unmap_sg(struct device *dev, struct scatterlist *sg,
-				int nents, enum dma_data_direction direction,
-				unsigned long attrs)
-{
-}
-
 static u64 dma_nommu_get_required_mask(struct device *dev)
 {
 	u64 end, mask;
@@ -228,14 +222,6 @@ static inline dma_addr_t dma_nommu_map_page(struct device *dev,
 	return page_to_phys(page) + offset + get_dma_offset(dev);
 }
 
-static inline void dma_nommu_unmap_page(struct device *dev,
-					 dma_addr_t dma_address,
-					 size_t size,
-					 enum dma_data_direction direction,
-					 unsigned long attrs)
-{
-}
-
 #ifdef CONFIG_NOT_COHERENT_CACHE
 static inline void dma_nommu_sync_sg(struct device *dev,
 		struct scatterlist *sgl, int nents,
@@ -261,10 +247,8 @@ const struct dma_map_ops dma_nommu_ops = {
 	.free				= dma_nommu_free_coherent,
 	.mmap				= dma_nommu_mmap_coherent,
 	.map_sg				= dma_nommu_map_sg,
-	.unmap_sg			= dma_nommu_unmap_sg,
 	.dma_supported			= dma_nommu_dma_supported,
 	.map_page			= dma_nommu_map_page,
-	.unmap_page			= dma_nommu_unmap_page,
 	.get_required_mask		= dma_nommu_get_required_mask,
 #ifdef CONFIG_NOT_COHERENT_CACHE
 	.sync_single_for_cpu 		= dma_nommu_sync_single,
-- 
2.19.1