sparc32: Convert mmu_* interfaces from btfixup to method ops.

This set of changes displays one major danger of btfixup, interface
signatures are not always type checked fully.  As seen here the iounit
variant of the map_dma_area routine had an incorrect type for one of
it's arguments.

It turns out to be harmless in this case, but just imagine trying to
debug something involving this kind of problem.  No thanks.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 25 insertions, 14 deletions

diff --git a/arch/sparc/include/asm/dma.h b/arch/sparc/include/asm/dma.h
index 1ef6f0b0a39f..3d434ef5eae3 100644
--- a/arch/sparc/include/asm/dma.h
+++ b/arch/sparc/include/asm/dma.h
@@ -92,21 +92,31 @@ extern int isa_dma_bridge_buggy;
 #ifdef CONFIG_SPARC32
 
 /* Routines for data transfer buffers. */
-struct page;
 struct device;
 struct scatterlist;
 
-/* These are implementations for sbus_map_sg/sbus_unmap_sg... collapse later */
-BTFIXUPDEF_CALL(__u32, mmu_get_scsi_one, struct device *, char *, unsigned long)
-BTFIXUPDEF_CALL(void,  mmu_get_scsi_sgl, struct device *, struct scatterlist *, int)
-BTFIXUPDEF_CALL(void,  mmu_release_scsi_one, struct device *, __u32, unsigned long)
-BTFIXUPDEF_CALL(void,  mmu_release_scsi_sgl, struct device *, struct scatterlist *, int)
+struct sparc32_dma_ops {
+	__u32 (*get_scsi_one)(struct device *, char *, unsigned long);
+	void (*get_scsi_sgl)(struct device *, struct scatterlist *, int);
+	void (*release_scsi_one)(struct device *, __u32, unsigned long);
+	void (*release_scsi_sgl)(struct device *, struct scatterlist *,int);
+#ifdef CONFIG_SBUS
+	int (*map_dma_area)(struct device *, dma_addr_t *, unsigned long, unsigned long, int);
+	void (*unmap_dma_area)(struct device *, unsigned long, int);
+#endif
+};
+extern const struct sparc32_dma_ops *sparc32_dma_ops;
 
-#define mmu_get_scsi_one(dev,vaddr,len) BTFIXUP_CALL(mmu_get_scsi_one)(dev,vaddr,len)
-#define mmu_get_scsi_sgl(dev,sg,sz) BTFIXUP_CALL(mmu_get_scsi_sgl)(dev,sg,sz)
-#define mmu_release_scsi_one(dev,vaddr,len) BTFIXUP_CALL(mmu_release_scsi_one)(dev,vaddr,len)
-#define mmu_release_scsi_sgl(dev,sg,sz) BTFIXUP_CALL(mmu_release_scsi_sgl)(dev,sg,sz)
+#define mmu_get_scsi_one(dev,vaddr,len) \
+	sparc32_dma_ops->get_scsi_one(dev, vaddr, len)
+#define mmu_get_scsi_sgl(dev,sg,sz) \
+	sparc32_dma_ops->get_scsi_sgl(dev, sg, sz)
+#define mmu_release_scsi_one(dev,vaddr,len) \
+	sparc32_dma_ops->release_scsi_one(dev, vaddr,len)
+#define mmu_release_scsi_sgl(dev,sg,sz) \
+	sparc32_dma_ops->release_scsi_sgl(dev, sg, sz)
 
+#ifdef CONFIG_SBUS
 /*
  * mmu_map/unmap are provided by iommu/iounit; Invalid to call on IIep.
  *
@@ -122,11 +132,12 @@ BTFIXUPDEF_CALL(void,  mmu_release_scsi_sgl, struct device *, struct scatterlist
  * know if we are mapping RAM or I/O, so it has to be an additional argument
  * to a separate mapping function for CPU visible mappings.
  */
-BTFIXUPDEF_CALL(int, mmu_map_dma_area, struct device *, dma_addr_t *, unsigned long, unsigned long, int len)
-BTFIXUPDEF_CALL(void, mmu_unmap_dma_area, struct device *, unsigned long busa, int len)
+#define sbus_map_dma_area(dev,pba,va,a,len) \
+	sparc32_dma_ops->map_dma_area(dev, pba, va, a, len)
+#define sbus_unmap_dma_area(dev,ba,len) \
+	sparc32_dma_ops->unmap_dma_area(dev, ba, len)
+#endif /* CONFIG_SBUS */
 
-#define mmu_map_dma_area(dev,pba,va,a,len) BTFIXUP_CALL(mmu_map_dma_area)(dev,pba,va,a,len)
-#define mmu_unmap_dma_area(dev,ba,len) BTFIXUP_CALL(mmu_unmap_dma_area)(dev,ba,len)
 #endif
 
 #endif /* !(_ASM_SPARC_DMA_H) */