[PATCH] ARM: dma-mapping: Use vma_pages helper

[Vasyl Gomonovych]

Use vma_pages function on vma object instead of explicit computation.
arch/arm/mm/dma-mapping.c:849:36-42: WARNING: Consider using vma_pages helper on vma
Generated by: scripts/coccinelle/api/vma_pages.cocci

Signed-off-by: Vasyl Gomonovych <gomonovych@xxxxxxxxx>
---
 arch/arm/mm/dma-mapping.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index fcf1473d6fed..855427620b01 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -846,7 +846,7 @@ static int __arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
 		 unsigned long attrs)
 {
 	int ret;
-	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 pfn = dma_to_pfn(dev, dma_addr);
 	unsigned long off = vma->vm_pgoff;
-- 
1.9.1