xenLinux/ia64 has its own dma_map_page(), dma_unmap_page(), and it needs

linux default implementations of dma_declare_coheremnt_memory() and its
families which is defined in include/linux/dma-mapping.h.
So those in pci-dma-xen.c are unnecessary. #ifdef out them.
PATCHNAME: pci-dma-xen-common

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>

linux-2.6-xen-sparse/arch/i386/kernel/pci-dma-xen.c

@@ -93,6 +93,13 @@ dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 }
 EXPORT_SYMBOL(dma_unmap_sg);
 
+/*
+ * XXX This file is also used by xenLinux/ia64. 
+ * "defined(__i386__) || defined (__x86_64__)" means "!defined(__ia64__)".
+ * This #if work around should be removed once this file is merbed back into
+ * i386' pci-dma or is moved to drivers/xen/core.
+ */
+#if defined(__i386__) || defined(__x86_64__)
 dma_addr_t
 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
 	     size_t size, enum dma_data_direction direction)
@@ -122,6 +129,7 @@ dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 		swiotlb_unmap_page(dev, dma_address, size, direction);
 }
 EXPORT_SYMBOL(dma_unmap_page);
+#endif /* defined(__i386__) || defined(__x86_64__) */
 
 int
 dma_mapping_error(dma_addr_t dma_addr)
@@ -204,6 +212,7 @@ void dma_free_coherent(struct device *dev, size_t size,
 }
 EXPORT_SYMBOL(dma_free_coherent);
 
+#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 				dma_addr_t device_addr, size_t size, int flags)
 {
@@ -280,6 +289,7 @@ void *dma_mark_declared_memory_occupied(struct device *dev,
 	return mem->virt_base + (pos << PAGE_SHIFT);
 }
 EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
+#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 
 dma_addr_t
 dma_map_single(struct device *dev, void *ptr, size_t size,