x86: delete empty functions from pci-nommu_64.c

This functions are now called conditionally on their
existence in the struct. So just delete them, instead
of keeping an empty implementation.
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/pci-nommu_64.c

@@ -35,10 +35,6 @@ nommu_map_single(struct device *hwdev, phys_addr_t paddr, size_t size,
 	return bus;
 }
 
-static void nommu_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
-			int direction)
-{
-}
 
 /* Map a set of buffers described by scatterlist in streaming
  * mode for DMA.  This is the scatter-gather version of the
@@ -71,20 +67,9 @@ static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
 	return nents;
 }
 
-/* Unmap a set of streaming mode DMA translations.
- * Again, cpu read rules concerning calls here are the same as for
- * pci_unmap_single() above.
- */
-static void nommu_unmap_sg(struct device *dev, struct scatterlist *sg,
-		  int nents, int dir)
-{
-}
-
 const struct dma_mapping_ops nommu_dma_ops = {
 	.map_single = nommu_map_single,
-	.unmap_single = nommu_unmap_single,
 	.map_sg = nommu_map_sg,
-	.unmap_sg = nommu_unmap_sg,
 	.is_phys = 1,
 };