arm64: dma-mapping: Cocci spatch "vma_pages"

Use vma_pages function on vma object instead of explicit computation.
Found by coccinelle spatch "api/vma_pages.cocci"

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 614af886b7ef4f7348470f8746ea822e8665401a..5f62090bda2435e3419720c8a5ecdcf826e19018 100644 (file)
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -303,8 +303,7 @@ static int __swiotlb_mmap_pfn(struct vm_area_struct *vma,
                              unsigned long pfn, size_t size)
 {
        int ret = -ENXIO;
-       unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >>
-                                       PAGE_SHIFT;
+       unsigned long nr_vma_pages = vma_pages(vma);
        unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
        unsigned long off = vma->vm_pgoff;