linux-kernel - Re: [PATCH 2/3] perf tools: Remove bpf_map__set_priv/bpf_map_

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Date:   Fri, 18 Feb 2022 10:01:34 +0100
From:   Jiri Olsa <olsajiri@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        "linux-perf-use." <linux-perf-users@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH 2/3] perf tools: Remove bpf_map__set_priv/bpf_map__priv
 usage

On Thu, Feb 17, 2022 at 01:49:39PM -0800, Andrii Nakryiko wrote:
> On Thu, Feb 17, 2022 at 5:19 AM Jiri Olsa <jolsa@...nel.org> wrote:
> >
> > Both bpf_map__set_priv/bpf_map__priv are deprecated
> > and will be eventually removed.
> >
> > Using hashmap to replace that functionality.
> >
> > Suggested-by: Andrii Nakryiko <andrii@...nel.org>
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  tools/perf/util/bpf-loader.c | 62 ++++++++++++++++++++++++++++++++----
> >  1 file changed, 55 insertions(+), 7 deletions(-)
> >
> 
> [...]
> 
> > +static int map_set_priv(struct bpf_map *map, void *priv)
> > +{
> > +       void *old_priv;
> > +
> > +       if (!bpf_map_hash) {
> > +               bpf_map_hash = hashmap__new(ptr_hash, ptr_equal, NULL);
> > +               if (!bpf_map_hash)
> 
> same as in previous patch, on error this is not going to be NULL

yes, will change

jirka

> 
> > +                       return -ENOMEM;
> > +       }
> > +
> > +       old_priv = map_priv(map);
> > +       if (old_priv) {
> > +               bpf_map_priv__clear(map, old_priv);
> > +               return hashmap__set(bpf_map_hash, map, priv, NULL, NULL);
> > +       }
> > +       return hashmap__add(bpf_map_hash, map, priv);
> > +}
> > +
> 
> [...]