huge_node
extern int huge_node(struct vm_area_struct *vma,
nid = huge_node(vma, address, gfp_mask, &mpol, &nodemask);
nid = huge_node(vma, addr, gfp_mask, &mpol, &nodemask);
node = huge_node(vma, address, gfp_mask, &mpol, &nodemask);