dma-mapping: use unsigned long for dma_attrs

The dma-mapping core and the implementations do not change the DMA
attributes passed by pointer.  Thus the pointer can point to const data.
However the attributes do not have to be a bitfield.  Instead unsigned
long will do fine:

1. This is just simpler.  Both in terms of reading the code and setting
   attributes.  Instead of initializing local attributes on the stack
   and passing pointer to it to dma_set_attr(), just set the bits.

2. It brings safeness and checking for const correctness because the
   attributes are passed by value.

Semantic patches for this change (at least most of them):

    virtual patch
    virtual context

    @r@
    identifier f, attrs;

    @@
    f(...,
    - struct dma_attrs *attrs
    + unsigned long attrs
    , ...)
    {
    ...
    }

    @@
    identifier r.f;
    @@
    f(...,
    - NULL
    + 0
     )

and

    // Options: --all-includes
    virtual patch
    virtual context

    @r@
    identifier f, attrs;
    type t;

    @@
    t f(..., struct dma_attrs *attrs);

    @@
    identifier r.f;
    @@
    f(...,
    - NULL
    + 0
     )

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Vineet Gupta <[email protected]>
Acked-by: Robin Murphy <[email protected]>
Acked-by: Hans-Christian Noren Egtvedt <[email protected]>
Acked-by: Mark Salter <[email protected]> [c6x]
Acked-by: Jesper Nilsson <[email protected]> [cris]
Acked-by: Daniel Vetter <[email protected]> [drm]
Reviewed-by: Bart Van Assche <[email protected]>
Acked-by: Joerg Roedel <[email protected]> [iommu]
Acked-by: Fabien Dessenne <[email protected]> [bdisp]
Reviewed-by: Marek Szyprowski <[email protected]> [vb2-core]
Acked-by: David Vrabel <[email protected]> [xen]
Acked-by: Konrad Rzeszutek Wilk <[email protected]> [xen swiotlb]
Acked-by: Joerg Roedel <[email protected]> [iommu]
Acked-by: Richard Kuo <[email protected]> [hexagon]
Acked-by: Geert Uytterhoeven <[email protected]> [m68k]
Acked-by: Gerald Schaefer <[email protected]> [s390]
Acked-by: Bjorn Andersson <[email protected]>
Acked-by: Hans-Christian Noren Egtvedt <[email protected]> [avr32]
Acked-by: Vineet Gupta <[email protected]> [arc]
Acked-by: Robin Murphy <[email protected]> [arm64 and dma-iommu]
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

arch/xtensa/kernel/pci-dma.c

@@ -142,7 +142,7 @@ static void xtensa_sync_sg_for_device(struct device *dev,
 
 static void *xtensa_dma_alloc(struct device *dev, size_t size,
 			      dma_addr_t *handle, gfp_t flag,
-			      struct dma_attrs *attrs)
+			      unsigned long attrs)
 {
 	unsigned long ret;
 	unsigned long uncached = 0;
@@ -171,7 +171,7 @@ static void *xtensa_dma_alloc(struct device *dev, size_t size,
 }
 
 static void xtensa_dma_free(struct device *hwdev, size_t size, void *vaddr,
-			    dma_addr_t dma_handle, struct dma_attrs *attrs)
+			    dma_addr_t dma_handle, unsigned long attrs)
 {
 	unsigned long addr = (unsigned long)vaddr +
 		XCHAL_KSEG_CACHED_VADDR - XCHAL_KSEG_BYPASS_VADDR;
@@ -185,7 +185,7 @@ static void xtensa_dma_free(struct device *hwdev, size_t size, void *vaddr,
 static dma_addr_t xtensa_map_page(struct device *dev, struct page *page,
 				  unsigned long offset, size_t size,
 				  enum dma_data_direction dir,
-				  struct dma_attrs *attrs)
+				  unsigned long attrs)
 {
 	dma_addr_t dma_handle = page_to_phys(page) + offset;
 
@@ -195,14 +195,14 @@ static dma_addr_t xtensa_map_page(struct device *dev, struct page *page,
 
 static void xtensa_unmap_page(struct device *dev, dma_addr_t dma_handle,
 			      size_t size, enum dma_data_direction dir,
-			      struct dma_attrs *attrs)
+			      unsigned long attrs)
 {
 	xtensa_sync_single_for_cpu(dev, dma_handle, size, dir);
 }
 
 static int xtensa_map_sg(struct device *dev, struct scatterlist *sg,
 			 int nents, enum dma_data_direction dir,
-			 struct dma_attrs *attrs)
+			 unsigned long attrs)
 {
 	struct scatterlist *s;
 	int i;
@@ -217,7 +217,7 @@ static int xtensa_map_sg(struct device *dev, struct scatterlist *sg,
 static void xtensa_unmap_sg(struct device *dev,
 			    struct scatterlist *sg, int nents,
 			    enum dma_data_direction dir,
-			    struct dma_attrs *attrs)
+			    unsigned long attrs)
 {
 	struct scatterlist *s;
 	int i;