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 <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
rtvt123 · May 21, 2013 · a0ea59d · a0ea59d
1 parent 80fe636
commit a0ea59d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/drivers/char/mspec.c b/drivers/char/mspec.c
@@ -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);