linux-kernel - Re: [PATCH 4/8] libbpf: Add libbpf__kallsyms

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Message-ID: <CAEf4Bzaj3x8K6VA5FgkYbbAWz2vtBwyepbpe-np30pYD1m22gQ@mail.gmail.com>
Date:   Mon, 7 Feb 2022 10:59:24 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Jiri Olsa <olsajiri@...il.com>
Subject: Re: [PATCH 4/8] libbpf: Add libbpf__kallsyms_parse function

On Wed, Feb 2, 2022 at 5:54 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> Move the kallsyms parsing in internal libbpf__kallsyms_parse
> function, so it can be used from other places.
>
> It will be used in following changes.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/lib/bpf/libbpf.c          | 62 ++++++++++++++++++++-------------
>  tools/lib/bpf/libbpf_internal.h |  5 +++
>  2 files changed, 43 insertions(+), 24 deletions(-)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 1b0936b016d9..7d595cfd03bc 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -7165,12 +7165,10 @@ static int bpf_object__sanitize_maps(struct bpf_object *obj)
>         return 0;
>  }
>
> -static int bpf_object__read_kallsyms_file(struct bpf_object *obj)
> +int libbpf__kallsyms_parse(void *arg, kallsyms_cb_t cb)

please call it libbpf_kallsyms_parse(), internal APIs don't use
"object oriented" double underscore separator

also this "arg" is normally called "ctx" in similar APIs in libbpf and
is passed the last, can you please adjust all that for consistency?

>  {
>         char sym_type, sym_name[500];
>         unsigned long long sym_addr;
> -       const struct btf_type *t;
> -       struct extern_desc *ext;
>         int ret, err = 0;
>         FILE *f;
>

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