unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
{
	if (vma->vm_ops && vma->vm_ops->pagesize)
		return vma->vm_ops->pagesize(vma);
	return PAGE_SIZE;
}
unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
{
	if (vma->vm_ops && vma->vm_ops->pagesize)
		return vma->vm_ops->pagesize(vma);
	return PAGE_SIZE;
}