Re: [PATCH bpf-next 3/5] libbpf: add btf__new_split() API that was declared but not implemented

[Yonghong Song <yonghong.song@linux.dev>]

On 1/30/24 11:36 AM, Andrii Nakryiko wrote:
> Seems like original commit adding split BTF support intended to add
> btf__new_split() API, and even declared it in libbpf.map, but never
> added (trivial) implementation. Fix this.
>
> Fixes: ba451366bf44 ("libbpf: Implement basic split BTF support")
> Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

The patch LGTM. We did some cross checking between libbpf.map
and the implementation. What things are missing here to
capture missed implementation or LIBBPF_API marking?

Acked-by: Yonghong Song <yonghong.song@linux.dev>

> ---
>   tools/lib/bpf/btf.c      | 5 +++++
>   tools/lib/bpf/libbpf.map | 3 ++-
>   2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
> index 95db88b36cf3..845034d15420 100644
> --- a/tools/lib/bpf/btf.c
> +++ b/tools/lib/bpf/btf.c
> @@ -1079,6 +1079,11 @@ struct btf *btf__new(const void *data, __u32 size)
>   	return libbpf_ptr(btf_new(data, size, NULL));
>   }
>   
> +struct btf *btf__new_split(const void *data, __u32 size, struct btf *base_btf)
> +{
> +	return libbpf_ptr(btf_new(data, size, base_btf));
> +}
> +
>   static struct btf *btf_parse_elf(const char *path, struct btf *base_btf,
>   				 struct btf_ext **btf_ext)
>   {
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index d9e1f57534fa..386964f572a8 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -245,7 +245,6 @@ LIBBPF_0.3.0 {
>   		btf__parse_raw_split;
>   		btf__parse_split;
>   		btf__new_empty_split;
> -		btf__new_split;
>   		ring_buffer__epoll_fd;
>   } LIBBPF_0.2.0;
>   
> @@ -411,5 +410,7 @@ LIBBPF_1.3.0 {
>   } LIBBPF_1.2.0;
>   
>   LIBBPF_1.4.0 {
> +	global:
>   		bpf_token_create;
> +		btf__new_split;
>   } LIBBPF_1.3.0;