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Date:   Sat, 2 May 2020 13:00:05 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Song Liu <songliubraving@...com>, Andrii Nakryiko <andriin@...com>
Cc:     bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v9 bpf-next 2/3] libbpf: add support for command BPF_ENABLE_STATS

On Thu, Apr 30, 2020 at 12:15 AM Song Liu <songliubraving@...com> wrote:
>
> bpf_enable_stats() is added to enable given stats.
>
> Signed-off-by: Song Liu <songliubraving@...com>
...
> diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
> index 335b457b3a25..1901b2777854 100644
> --- a/tools/lib/bpf/bpf.h
> +++ b/tools/lib/bpf/bpf.h
> @@ -231,6 +231,7 @@ LIBBPF_API int bpf_load_btf(void *btf, __u32 btf_size, char *log_buf,
>  LIBBPF_API int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf,
>                                  __u32 *buf_len, __u32 *prog_id, __u32 *fd_type,
>                                  __u64 *probe_offset, __u64 *probe_addr);
> +LIBBPF_API int bpf_enable_stats(enum bpf_stats_type type);

I see odd warning here while building selftests

In file included from runqslower.c:10:
.../tools/testing/selftests/bpf/tools/include/bpf/bpf.h:234:38:
warning: ‘enum bpf_stats_type’ declared inside parameter list will not
be visible outside of this definition or declaration
  234 | LIBBPF_API int bpf_enable_stats(enum bpf_stats_type type);

Since this warning is printed only when building runqslower
and the rest of selftests are fine, I'm guessing
it's a makefile issue with order of includes?

Andrii, could you please take a look ?
Not urgent. Just flagging for visibility.

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