linux-kernel - Re: [PATCH v2] perf trace: Segfault when trying to trace events by cgroup

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Date:   Tue, 27 Oct 2020 14:10:42 +0900
From:   Namhyung Kim <namhyung@...il.com>
To:     Stanislav Ivanichkin <sivanichkin@...dex-team.ru>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        Dmitry Monakhov <dmtrmonakhov@...dex-team.ru>
Subject: Re: [PATCH v2] perf trace: Segfault when trying to trace events by cgroup

Hello,

On Mon, Oct 26, 2020 at 10:21 PM Stanislav Ivanichkin
<sivanichkin@...dex-team.ru> wrote:
>
>   v2:
>     - struct declaration fixed (Namhyung Kim)
>
> Fixes: 9ea42ba4411ac ("perf trace: Support setting cgroups as targets")
> Signed-off-by: Stanislav Ivanichkin <sivanichkin@...dex-team.ru>

Looks ok but you'd better add the commit description in v1.

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks
Namhyung

> ---
>  tools/perf/builtin-trace.c | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> index 44a75f234db1..de80534473af 100644
> --- a/tools/perf/builtin-trace.c
> +++ b/tools/perf/builtin-trace.c
> @@ -4639,9 +4639,9 @@ static int trace__parse_events_option(const struct option *opt, const char *str,
>         err = 0;
>
>         if (lists[0]) {
> -               struct option o = OPT_CALLBACK('e', "event", &trace->evlist, "event",
> -                                              "event selector. use 'perf list' to list available events",
> -                                              parse_events_option);
> +               struct option o = {
> +                       .value = &trace->evlist,
> +               };
>                 err = parse_events_option(&o, lists[0], 0);
>         }
>  out:
> @@ -4655,9 +4655,12 @@ static int trace__parse_cgroups(const struct option *opt, const char *str, int u
>  {
>         struct trace *trace = opt->value;
>
> -       if (!list_empty(&trace->evlist->core.entries))
> -               return parse_cgroups(opt, str, unset);
> -
> +       if (!list_empty(&trace->evlist->core.entries)) {
> +               struct option o = {
> +                       .value = &trace->evlist,
> +               };
> +               return parse_cgroups(&o, str, unset);
> +       }
>         trace->cgroup = evlist__findnew_cgroup(trace->evlist, str);
>
>         return 0;
> --
> 2.17.1
>