[PATCH 6/6] uio: use vma_pages() to replace (vm_end - vm_start) >> PAGE_SHIFT

[Libin]

(*->vm_end - *->vm_start) >> PAGE_SHIFT operation is implemented
as a inline funcion vma_pages() in linux/mm.h, so using it.

Signed-off-by: Libin <huawei.libin at huawei.com>
---
 drivers/uio/uio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index c8b9262..ba5447f 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -676,7 +676,7 @@ static int uio_mmap(struct file *filep, struct 
vm_area_struct *vma)
        if (mi < 0)
                return -EINVAL;

-       requested_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+       requested_pages = vma_pages(vma);
        actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK)
                        + idev->info->mem[mi].size + PAGE_SIZE -1) >> 
PAGE_SHIFT;
        if (requested_pages > actual_pages)
-- 
1.8.2.1