copy_vma
new_vma = copy_vma(&vma, vrm->new_addr, vrm->new_len, new_pgoff,
struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
TEST(copy_vma);
vma_new = copy_vma(&vma, 0, 0x2000, 0, &need_locks);
vma_new = copy_vma(&vma, 0x4000, 0x2000, 4, &need_locks);