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

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Date:   Tue, 8 Feb 2022 10:08:34 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.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 Mon, Feb 07, 2022 at 10:59:24AM -0800, Andrii Nakryiko wrote:
> 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?

ok, thanks

jirka

> 
> >  {
> >         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;
> >
> 
> [...]
>