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/1468399300-5399-2-git-send-email-k.kozlowski@samsung.com
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Acked-by: Mark Salter <msalter@redhat.com> [c6x]
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> [cris]
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> [drm]
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Acked-by: Joerg Roedel <jroedel@suse.de> [iommu]
Acked-by: Fabien Dessenne <fabien.dessenne@st.com> [bdisp]
Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com> [vb2-core]
Acked-by: David Vrabel <david.vrabel@citrix.com> [xen]
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [xen swiotlb]
Acked-by: Joerg Roedel <jroedel@suse.de> [iommu]
Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon]
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k]
Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> [s390]
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no> [avr32]
Acked-by: Vineet Gupta <vgupta@synopsys.com> [arc]
Acked-by: Robin Murphy <robin.murphy@arm.com> [arm64 and dma-iommu]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 11 insertions, 11 deletions

diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index a6d6190c9d24..630ee8073899 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -919,7 +919,7 @@ sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
 static dma_addr_t sba_map_page(struct device *dev, struct page *page,
                                unsigned long poff, size_t size,
                                enum dma_data_direction dir,
-                               struct dma_attrs *attrs)
+                               unsigned long attrs)
 {
         struct ioc *ioc;
         void *addr = page_address(page) + poff;
@@ -1005,7 +1005,7 @@ static dma_addr_t sba_map_page(struct device *dev, struct page *page,
 
 static dma_addr_t sba_map_single_attrs(struct device *dev, void *addr,
                                        size_t size, enum dma_data_direction dir,
-                                       struct dma_attrs *attrs)
+                                       unsigned long attrs)
 {
         return sba_map_page(dev, virt_to_page(addr),
                             (unsigned long)addr & ~PAGE_MASK, size, dir, attrs);
@@ -1046,7 +1046,7 @@ sba_mark_clean(struct ioc *ioc, dma_addr_t iova, size_t size)
  * See Documentation/DMA-API-HOWTO.txt
  */
 static void sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
-                           enum dma_data_direction dir, struct dma_attrs *attrs)
+                           enum dma_data_direction dir, unsigned long attrs)
 {
         struct ioc *ioc;
 #if DELAYED_RESOURCE_CNT > 0
@@ -1115,7 +1115,7 @@ static void sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
 }
 
 void sba_unmap_single_attrs(struct device *dev, dma_addr_t iova, size_t size,
-                            enum dma_data_direction dir, struct dma_attrs *attrs)
+                            enum dma_data_direction dir, unsigned long attrs)
 {
         sba_unmap_page(dev, iova, size, dir, attrs);
 }
@@ -1130,7 +1130,7 @@ void sba_unmap_single_attrs(struct device *dev, dma_addr_t iova, size_t size,
  */
 static void *
 sba_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
-                   gfp_t flags, struct dma_attrs *attrs)
+                   gfp_t flags, unsigned long attrs)
 {
         struct ioc *ioc;
         void *addr;
@@ -1175,7 +1175,7 @@ sba_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
          * device to map single to get an iova mapping.
          */
         *dma_handle = sba_map_single_attrs(&ioc->sac_only_dev->dev, addr,
-                                           size, 0, NULL);
+                                           size, 0, 0);
 
         return addr;
 }
@@ -1191,9 +1191,9 @@ sba_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
  * See Documentation/DMA-API-HOWTO.txt
  */
 static void sba_free_coherent(struct device *dev, size_t size, void *vaddr,
-                              dma_addr_t dma_handle, struct dma_attrs *attrs)
+                              dma_addr_t dma_handle, unsigned long attrs)
 {
-        sba_unmap_single_attrs(dev, dma_handle, size, 0, NULL);
+        sba_unmap_single_attrs(dev, dma_handle, size, 0, 0);
         free_pages((unsigned long) vaddr, get_order(size));
 }
 
@@ -1442,7 +1442,7 @@ sba_coalesce_chunks(struct ioc *ioc, struct device *dev,
 
 static void sba_unmap_sg_attrs(struct device *dev, struct scatterlist *sglist,
                                int nents, enum dma_data_direction dir,
-                               struct dma_attrs *attrs);
+                               unsigned long attrs);
 /**
  * sba_map_sg - map Scatter/Gather list
  * @dev: instance of PCI owned by the driver that's asking.
@@ -1455,7 +1455,7 @@ static void sba_unmap_sg_attrs(struct device *dev, struct scatterlist *sglist,
  */
 static int sba_map_sg_attrs(struct device *dev, struct scatterlist *sglist,
                             int nents, enum dma_data_direction dir,
-                            struct dma_attrs *attrs)
+                            unsigned long attrs)
 {
         struct ioc *ioc;
         int coalesced, filled = 0;
@@ -1551,7 +1551,7 @@ static int sba_map_sg_attrs(struct device *dev, struct scatterlist *sglist,
  */
 static void sba_unmap_sg_attrs(struct device *dev, struct scatterlist *sglist,
                                int nents, enum dma_data_direction dir,
-                               struct dma_attrs *attrs)
+                               unsigned long attrs)
 {
 #ifdef ASSERT_PDIR_SANITY
         struct ioc *ioc;