[ARM] Convert DMA cache handling to take const void * args

The DMA cache handling functions take virtual addresses, but in the
form of unsigned long arguments.  This leads to a little confusion
about what exactly they take.  So, convert them to take const void *
instead.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 9 insertions, 11 deletions

diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index b4748e3..2362c49 100644
--- a/arch/arm/common/dmabounce.c
+++ b/arch/arm/common/dmabounce.c
@@ -321,12 +321,12 @@ unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 		DO_STATS ( device_info->bounce_count++ );
 
 		if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) {
-			unsigned long ptr;
+			void *ptr = buf->ptr;
 
 			dev_dbg(dev,
 				"%s: copy back safe %p to unsafe %p size %d\n",
-				__func__, buf->safe, buf->ptr, size);
-			memcpy(buf->ptr, buf->safe, size);
+				__func__, buf->safe, ptr, size);
+			memcpy(ptr, buf->safe, size);
 
 			/*
 			 * DMA buffers must have the same cache properties
@@ -336,7 +336,6 @@ unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 			 * bidirectional case because we know the cache
 			 * lines will be coherent with the data written.
 			 */
-			ptr = (unsigned long)buf->ptr;
 			dmac_clean_range(ptr, ptr + size);
 			outer_clean_range(__pa(ptr), __pa(ptr) + size);
 		}
diff --git a/arch/arm/mm/consistent.c b/arch/arm/mm/consistent.c
index 83bd035..166aee1 100644
--- a/arch/arm/mm/consistent.c
+++ b/arch/arm/mm/consistent.c
@@ -205,10 +205,10 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
 	 * kernel direct-mapped region for device DMA.
 	 */
 	{
-		unsigned long kaddr = (unsigned long)page_address(page);
-		memset(page_address(page), 0, size);
-		dmac_flush_range(kaddr, kaddr + size);
-		outer_flush_range(__pa(kaddr), __pa(kaddr) + size);
+		void *ptr = page_address(page);
+		memset(ptr, 0, size);
+		dmac_flush_range(ptr, ptr + size);
+		outer_flush_range(__pa(ptr), __pa(ptr) + size);
 	}
 
 	/*
@@ -481,10 +481,9 @@ core_initcall(consistent_init);
  * platforms with CONFIG_DMABOUNCE.
  * Use the driver DMA support - see dma-mapping.h (dma_sync_*)
  */
-void consistent_sync(void *vaddr, size_t size, int direction)
+void consistent_sync(const void *start, size_t size, int direction)
 {
-	unsigned long start = (unsigned long)vaddr;
-	unsigned long end   = start + size;
+	const void *end = start + size;
 
 	BUG_ON(!virt_addr_valid(start) || !virt_addr_valid(end));