Re: [PATCH v10 bpf-next 04/10] libbpf: Add layout encoding support

On Fri, Feb 27, 2026 at 2:05 AM Alan Maguire <[email protected]> wrote:
>
> Support encoding of BTF layout data via btf__new_empty_opts().
>
> Current supported opts are base_btf and add_layout.
>
> Layout information is maintained in btf.c in the layouts[] array;
> when BTF is created with the add_layout option it represents the
> current view of supported BTF kinds.
>
> Signed-off-by: Alan Maguire <[email protected]>
> ---
>  tools/lib/bpf/btf.c      | 62 ++++++++++++++++++++++++++++++++++++++--
>  tools/lib/bpf/btf.h      | 20 +++++++++++++
>  tools/lib/bpf/libbpf.map |  1 +
>  3 files changed, 80 insertions(+), 3 deletions(-)
>
> diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
> index db13c15a0049..0c7fc0b49f20 100644
> --- a/tools/lib/bpf/btf.c
> +++ b/tools/lib/bpf/btf.c
> @@ -29,6 +29,35 @@
>
>  static struct btf_type btf_void;
>
> +/* Describe how kinds are laid out; some have a singular element following the "struct btf_type",
> + * some have BTF_INFO_VLEN(t->info) elements.  Specify sizes for both.  Flags are currently unused.
> + * Kind layout can be optionally added to the BTF representation in a dedicated section to
> + * facilitate parsing.  New kinds must be added here.
> + */

Pls use proper kernel comment style in any new code.