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char: Use vma_pages() to replace (vm_end - vm_start) >> PAGE_SHIFT 

(*->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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Libin 2013-05-13 10:17:39 +08:00 committed by Greg Kroah-Hartman
parent 80fe636154
commit a0ea59d56d
1 changed files with 1 additions and 1 deletions
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2
drivers/char/mspec.c
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@ -267,7 +267,7 @@ mspec_mmap(struct file *file, struct vm_area_struct *vma,
if ((vma->vm_flags & VM_WRITE) == 0)
return -EPERM;
pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
pages = vma_pages(vma);
vdata_size = sizeof(struct vma_data) + pages * sizeof(long);
if (vdata_size <= PAGE_SIZE)
vdata = kzalloc(vdata_size, GFP_KERNEL);