try_merge_new_vma
vma_d = try_merge_new_vma(&mm, &vmg, 0x7000, 0x9000, 7, vm_flags, &merged);
vma = try_merge_new_vma(&mm, &vmg, 0x2000, 0x3000, 2, vm_flags, &merged);
vma = try_merge_new_vma(&mm, &vmg, 0x4000, 0x5000, 4, vm_flags, &merged);
vma = try_merge_new_vma(&mm, &vmg, 0x6000, 0x7000, 6, vm_flags, &merged);
vma = try_merge_new_vma(&mm, &vmg, 0x5000, 0x6000, 5, vm_flags, &merged);
vma = try_merge_new_vma(&mm, &vmg, 0xa000, 0xb000, 0xa, vm_flags, &merged);
vma = try_merge_new_vma(&mm, &vmg, 0x9000, 0xa000, 0x9, vm_flags, &merged);