x86: unify dma_mapping_error

We provide a map_error function in pci-base_32.c to make
sure i386 keeps with the same behaviour it used to.
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-base_32.c

@@ -30,6 +30,12 @@ static int pci32_dma_map_sg(struct device *dev, struct scatterlist *sglist,
 	return nents;
 }
 
+/* Make sure we keep the same behaviour */
+static int pci32_map_error(dma_addr_t dma_addr)
+{
+	return 0;
+}
+
 static const struct dma_mapping_ops pci32_dma_ops = {
 	.map_single = pci32_map_single,
 	.unmap_single = NULL,
@@ -41,6 +47,7 @@ static const struct dma_mapping_ops pci32_dma_ops = {
 	.sync_single_range_for_device = NULL,
 	.sync_sg_for_cpu = NULL,
 	.sync_sg_for_device = NULL,
+	.mapping_error = pci32_map_error,
 };
 
 const struct dma_mapping_ops *dma_ops = &pci32_dma_ops;

include/asm-x86/dma-mapping.h

@@ -54,6 +54,14 @@ struct dma_mapping_ops {
 
 extern const struct dma_mapping_ops *dma_ops;
 
+static inline int dma_mapping_error(dma_addr_t dma_addr)
+{
+	if (dma_ops->mapping_error)
+		return dma_ops->mapping_error(dma_addr);
+
+	return (dma_addr == bad_dma_address);
+}
+
 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 

include/asm-x86/dma-mapping_32.h

@@ -8,12 +8,6 @@
 #include <asm/io.h>
 #include <asm/bug.h>
 
-static inline int
-dma_mapping_error(dma_addr_t dma_addr)
-{
-	return 0;
-}
-
 extern int forbid_dac;
 
 static inline int

include/asm-x86/dma-mapping_64.h

@@ -3,14 +3,6 @@
 
 extern int iommu_merge;
 
-static inline int dma_mapping_error(dma_addr_t dma_addr)
-{
-	if (dma_ops->mapping_error)
-		return dma_ops->mapping_error(dma_addr);
-
-	return (dma_addr == bad_dma_address);
-}
-
 /* same for gart, swiotlb, and nommu */
 static inline int dma_get_cache_alignment(void)
 {