vma_policy
old = vma_policy(vma);
mpol_put(vma_policy(tmp));
mpol_put(vma_policy(new_vma));
mpol_equal(vma_policy(a), vma_policy(b)) &&
mpol_put(vma_policy(vp->remove));
mpol_put(vma_policy(vma));
mpol_put(vma_policy(new));
if (!mpol_equal(vmg->policy, vma_policy(vma)))
.policy = vma_policy(vma_), \