static vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
 {
        struct vm_area_struct *vma = vmf->vma;
-       struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
-           vma->vm_private_data;
+       struct ttm_buffer_object *bo = vma->vm_private_data;
        struct ttm_bo_device *bdev = bo->bdev;
        unsigned long page_offset;
        unsigned long page_last;
 
 static void ttm_bo_vm_open(struct vm_area_struct *vma)
 {
-       struct ttm_buffer_object *bo =
-           (struct ttm_buffer_object *)vma->vm_private_data;
+       struct ttm_buffer_object *bo = vma->vm_private_data;
 
        WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping);
 
 
 static void ttm_bo_vm_close(struct vm_area_struct *vma)
 {
-       struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data;
+       struct ttm_buffer_object *bo = vma->vm_private_data;
 
        ttm_bo_put(bo);
        vma->vm_private_data = NULL;