netdev - Re: [PATCH 2/3] bpf_encoder: Translate SHN_XINDEX in symbol's st

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Date:   Fri, 22 Jan 2021 10:32:34 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>, dwarves@...r.kernel.org,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Yonghong Song <yhs@...com>, Hao Luo <haoluo@...gle.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Mark Wielaard <mjw@...hat.com>
Subject: Re: [PATCH 2/3] bpf_encoder: Translate SHN_XINDEX in symbol's
 st_shndx values

On Thu, Jan 21, 2021 at 03:32:40PM -0800, Andrii Nakryiko wrote:
> On Thu, Jan 21, 2021 at 12:25 PM Jiri Olsa <jolsa@...nel.org> wrote:
> >
> > For very large ELF objects (with many sections), we could
> > get special value SHN_XINDEX (65535) for symbol's st_shndx.
> >
> > This patch is adding code to detect the optional extended
> > section index table and use it to resolve symbol's section
> > index.
> >
> > Adding elf_symtab__for_each_symbol_index macro that returns
> > symbol's section index and usign it in collect_symbols function.
> >
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> 
> You missed fixing up collect_function() as well, which is using
> elf_sym__section(), which doesn't know about extended numbering.

ah right, it's for modules, I guess it's why it did not show up

thanks,
jirka