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uio: use vma_pages() to replace (vm_end - vm_start) >> PAGE_SHIFT

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(*->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@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Libin 2013-07-03 15:01:27 -07:00 committed by Linus Torvalds
parent ef9f515a4c
commit 52c2dad914
1 changed files with 1 additions and 1 deletions
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2
drivers/uio/uio.c
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@ -677,7 +677,7 @@ 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)