# Re: \[PATCH bpf-next\] bpf: Simplify expression for identify bpf mem type

- From: Alexei Starovoitov \<hidden\>
- Date: 2021-03-17 19:52:28 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/03/6305564
- Thread: https://ratatoskr.run/bpf/2021/03/6305038/t.md

```text
On Wed, Mar 17, 2021 at 5:52 AM Jianlin Lv [ref] wrote:
>         return BPF_CLASS(meta->insn.code);
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index 2d3036e292a9..5d77675e7112 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -21,6 +21,7 @@
>  #define BPF_DW         0x18    /* double word (64-bit) */
>  #define BPF_ATOMIC     0xc0    /* atomic memory ops - op type in immediate */
>  #define BPF_XADD       0xc0    /* exclusive add - legacy name */
> +#define BPF_SIZE_MASK  0x18    /* mask of size modifier */

Pls don't add kernel internal defines to uapi.
```