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/microblaze/include/asm/dma-mapping.h

@@ -25,7 +25,6 @@
 #include <linux/mm.h>
 #include <linux/scatterlist.h>
 #include <linux/dma-debug.h>
-#include <linux/dma-attrs.h>
 #include <asm/io.h>
 #include <asm/cacheflush.h>
 

arch/microblaze/kernel/dma.c

@@ -17,7 +17,7 @@
 
 static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
 				       dma_addr_t *dma_handle, gfp_t flag,
-				       struct dma_attrs *attrs)
+				       unsigned long attrs)
 {
 #ifdef NOT_COHERENT_CACHE
 	return consistent_alloc(flag, size, dma_handle);
@@ -42,7 +42,7 @@ static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
 
 static void dma_direct_free_coherent(struct device *dev, size_t size,
 				     void *vaddr, dma_addr_t dma_handle,
-				     struct dma_attrs *attrs)
+				     unsigned long attrs)
 {
 #ifdef NOT_COHERENT_CACHE
 	consistent_free(size, vaddr);
@@ -53,7 +53,7 @@ static void dma_direct_free_coherent(struct device *dev, size_t size,
 
 static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
 			     int nents, enum dma_data_direction direction,
-			     struct dma_attrs *attrs)
+			     unsigned long attrs)
 {
 	struct scatterlist *sg;
 	int i;
@@ -78,7 +78,7 @@ static inline dma_addr_t dma_direct_map_page(struct device *dev,
 					     unsigned long offset,
 					     size_t size,
 					     enum dma_data_direction direction,
-					     struct dma_attrs *attrs)
+					     unsigned long attrs)
 {
 	__dma_sync(page_to_phys(page) + offset, size, direction);
 	return page_to_phys(page) + offset;
@@ -88,7 +88,7 @@ static inline void dma_direct_unmap_page(struct device *dev,
 					 dma_addr_t dma_address,
 					 size_t size,
 					 enum dma_data_direction direction,
-					 struct dma_attrs *attrs)
+					 unsigned long attrs)
 {
 /* There is not necessary to do cache cleanup
  *
@@ -157,7 +157,7 @@ dma_direct_sync_sg_for_device(struct device *dev,
 static
 int dma_direct_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
 			     void *cpu_addr, dma_addr_t handle, size_t size,
-			     struct dma_attrs *attrs)
+			     unsigned long attrs)
 {
 #ifdef CONFIG_MMU
 	unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;