netdev - Re: [PATCH] perf tools: Do not use deprecated bpf_program_

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Date:   Mon, 7 Sep 2020 17:59:46 +0200
From:   Tobias Klauser <tklauser@...tanz.ch>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: [PATCH] perf tools: Do not use deprecated bpf_program__title

On 2020-09-07 at 13:05:49 +0200, Jiri Olsa <jolsa@...hat.com> wrote:
> On Mon, Sep 07, 2020 at 01:02:37PM +0200, Jiri Olsa wrote:
> > The bpf_program__title function got deprecated in libbpf,
> > use the suggested alternative.
> > 
> > Fixes: 521095842027 ("libbpf: Deprecate notion of BPF program "title" in favor of "section name"")
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> 
> Arnaldo,
> the commit in 'Fixes' is not yet in your tree yet and the patch
> below will make the perf compilation fail in your perf/core..
> 
> it fixes perf compilation on top of bpf-next tree.. so I think it
> should go in through bpf-next tree
> 
> thanks,
> jirka
> 
> > ---
> >  tools/perf/util/bpf-loader.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
> > index 2feb751516ab..73de3973c8ec 100644
> > --- a/tools/perf/util/bpf-loader.c
> > +++ b/tools/perf/util/bpf-loader.c
> > @@ -328,7 +328,7 @@ config_bpf_program(struct bpf_program *prog)
> >  	probe_conf.no_inlines = false;
> >  	probe_conf.force_add = false;
> >  
> > -	config_str = bpf_program__title(prog, false);
> > +	config_str = bpf_program__section_name(prog);
> >  	if (IS_ERR(config_str)) {
> >  		pr_debug("bpf: unable to get title for program\n");
> >  		return PTR_ERR(config_str);
> > @@ -454,7 +454,7 @@ preproc_gen_prologue(struct bpf_program *prog, int n,
> >  	if (err) {
> >  		const char *title;
> >  
> > -		title = bpf_program__title(prog, false);
> > +		title = bpf_program__section_name(prog);
> >  		if (!title)
> >  			title = "[unknown]";

I think bpf_program__title at line 457 in preproc_gen_prologue also needs to be
changed given the following build failure:

util/bpf-loader.c: In function 'preproc_gen_prologue':
util/bpf-loader.c:457:3: error: 'bpf_program__title' is deprecated: BPF program title is confusing term; please use bpf_program__section_name() instead [-Werror=deprecated-declarations]
  457 |   title = bpf_program__title(prog, false);
      |   ^~~~~
In file included from util/bpf-loader.c:10:
/home/tklauser/src/linux/tools/lib/bpf/libbpf.h:203:13: note: declared here
  203 | const char *bpf_program__title(const struct bpf_program *prog, bool needs_copy);
      |             ^~~~~~~~~~~~~~~~~~