Re: [PATCH] bpf: export btf_find_by_name_kind and bpf_base_func_proto

[Kui-Feng Lee <sinquersw@gmail.com>]

On 7/23/24 20:19, Ming Lei wrote:
> Export btf_find_by_name_kind and bpf_base_func_proto, so that kernel
> module can use them.
> 
> Almost all existed struct_ops users(hid, sched_ext, ...) need the two APIs.
> 
> Without this change, hid-bpf can't be built as module.

Could you give me more context?
Give me a link of an example code or something?
Or explain the use case?

Thanks!

> 
> Cc: Benjamin Tissoires <bentiss@kernel.org>
> Cc: Jiri Kosina <jikos@kernel.org>
> Signed-off-by: Ming Lei <ming.lei@redhat.com>
> ---
>   kernel/bpf/btf.c     | 1 +
>   kernel/bpf/helpers.c | 1 +
>   2 files changed, 2 insertions(+)
> 
> diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
> index d5019c4454d6..fdc4c0c1829d 100644
> --- a/kernel/bpf/btf.c
> +++ b/kernel/bpf/btf.c
> @@ -567,6 +567,7 @@ s32 btf_find_by_name_kind(const struct btf *btf, const char *name, u8 kind)
>   
>   	return -ENOENT;
>   }
> +EXPORT_SYMBOL_GPL(btf_find_by_name_kind);
>   
>   s32 bpf_find_btf_id(const char *name, u32 kind, struct btf **btf_p)
>   {
> diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
> index b5f0adae8293..18d1a76f96d2 100644
> --- a/kernel/bpf/helpers.c
> +++ b/kernel/bpf/helpers.c
> @@ -2033,6 +2033,7 @@ bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
>   		return NULL;
>   	}
>   }
> +EXPORT_SYMBOL_GPL(bpf_base_func_proto);
>   
>   void bpf_list_head_free(const struct btf_field *field, void *list_head,
>   			struct bpf_spin_lock *spin_lock)