dma-mapping: remove dma_{alloc,free,mmap}_writecombine

We can already use DMA_ATTR_WRITE_COMBINE or the _wc prefixed version,
so remove the third way of doing things.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/dss/dispc.c

@@ -4609,11 +4609,10 @@ static int dispc_errata_i734_wa_init(struct dispc_device *dispc)
 	i734_buf.size = i734.ovli.width * i734.ovli.height *
 		color_mode_to_bpp(i734.ovli.fourcc) / 8;
 
-	i734_buf.vaddr = dma_alloc_writecombine(&dispc->pdev->dev,
-						i734_buf.size, &i734_buf.paddr,
-						GFP_KERNEL);
+	i734_buf.vaddr = dma_alloc_wc(&dispc->pdev->dev, i734_buf.size,
+				      &i734_buf.paddr, GFP_KERNEL);
 	if (!i734_buf.vaddr) {
-		dev_err(&dispc->pdev->dev, "%s: dma_alloc_writecombine failed\n",
+		dev_err(&dispc->pdev->dev, "%s: dma_alloc_wc failed\n",
 			__func__);
 		return -ENOMEM;
 	}
@@ -4626,8 +4625,8 @@ static void dispc_errata_i734_wa_fini(struct dispc_device *dispc)
 	if (!dispc->feat->has_gamma_i734_bug)
 		return;
 
-	dma_free_writecombine(&dispc->pdev->dev, i734_buf.size, i734_buf.vaddr,
-			      i734_buf.paddr);
+	dma_free_wc(&dispc->pdev->dev, i734_buf.size, i734_buf.vaddr,
+		    i734_buf.paddr);
 }
 
 static void dispc_errata_i734_wa(struct dispc_device *dispc)

include/linux/dma-mapping.h

@@ -796,9 +796,6 @@ static inline void *dma_alloc_wc(struct device *dev, size_t size,
 
 	return dma_alloc_attrs(dev, size, dma_addr, gfp, attrs);
 }
-#ifndef dma_alloc_writecombine
-#define dma_alloc_writecombine dma_alloc_wc
-#endif
 
 static inline void dma_free_wc(struct device *dev, size_t size,
 			       void *cpu_addr, dma_addr_t dma_addr)
@@ -806,9 +803,6 @@ static inline void dma_free_wc(struct device *dev, size_t size,
 	return dma_free_attrs(dev, size, cpu_addr, dma_addr,
 			      DMA_ATTR_WRITE_COMBINE);
 }
-#ifndef dma_free_writecombine
-#define dma_free_writecombine dma_free_wc
-#endif
 
 static inline int dma_mmap_wc(struct device *dev,
 			      struct vm_area_struct *vma,
@@ -818,9 +812,6 @@ static inline int dma_mmap_wc(struct device *dev,
 	return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
 			      DMA_ATTR_WRITE_COMBINE);
 }
-#ifndef dma_mmap_writecombine
-#define dma_mmap_writecombine dma_mmap_wc
-#endif
 
 #ifdef CONFIG_NEED_DMA_MAP_STATE
 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME