vma_uffd_ops
const struct vm_uffd_ops *ops = vma_uffd_ops(vma);
ops = vma_uffd_ops(dst_vma);
s->ops = vma_uffd_ops(vma);
if (state->ops != vma_uffd_ops(vma))
const struct vm_uffd_ops *ops = vma_uffd_ops(state->vma);
const struct vm_uffd_ops *ops = vma_uffd_ops(state->vma);
const struct vm_uffd_ops *ops = vma_uffd_ops(dst_vma);