On alpha-jensen:
  CC      drivers/base/platform.o
In file included from include/linux/dma-mapping.h:24,
                 from drivers/base/platform.c:16:
include/asm/dma-mapping.h:36: warning: "struct scatterlist" declared inside parameter list
include/asm/dma-mapping.h:36: warning: its scope is only this definition or declaration, which is probably not what you want
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
 
 #else  /* no PCI - no IOMMU. */
 
+struct scatterlist;
 void *dma_alloc_coherent(struct device *dev, size_t size,
                         dma_addr_t *dma_handle, gfp_t gfp);
 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,