int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk)
{
	int err;

	if (!walk->mm)
		return -EINVAL;

	VM_BUG_ON(!rwsem_is_locked(&walk->mm->mmap_sem));
	VM_BUG_ON(!vma);
	walk->vma = vma;
	err = walk_page_test(vma->vm_start, vma->vm_end, walk);
	if (err > 0)
		return 0;
	if (err < 0)
		return err;
	return __walk_page_range(vma->vm_start, vma->vm_end, walk);
}

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