linux-kernel - Re: [PATCH 04/23] perf dwarf-aux: Add die_find_func

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Date: Tue, 19 Mar 2024 13:33:31 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>, 
	linux-perf-users@...r.kernel.org, 
	Linus Torvalds <torvalds@...ux-foundation.org>, Stephane Eranian <eranian@...gle.com>, 
	Masami Hiramatsu <mhiramat@...nel.org>, linux-toolchains@...r.kernel.org, 
	linux-trace-devel@...r.kernel.org
Subject: Re: [PATCH 04/23] perf dwarf-aux: Add die_find_func_rettype()

On Tue, Mar 19, 2024 at 11:19 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> On Tue, Mar 19, 2024 at 10:42:00AM -0700, Namhyung Kim wrote:
> > On Tue, Mar 19, 2024 at 6:56 AM Arnaldo Carvalho de Melo
> > > > +             return NULL;
> > > > +
> > > > +     if (die_get_real_type(&tmp_die, die_mem) == NULL)
> > > > +             return NULL;
> > >
> > >
> > > Here you check die_get_real_type() return, may I go and do the same for
> > > the previous patch to address my review comment?
> >
> > Sure thing! :)
>
> Ack?

Yep, looks good!

Thanks,
Namhyung

>
> - Arnaldo
>
> diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
> index cd9364d296b6bf42..09fd6f1f0ed8eac3 100644
> --- a/tools/perf/util/dwarf-aux.c
> +++ b/tools/perf/util/dwarf-aux.c
> @@ -1856,7 +1856,10 @@ static int __die_find_member_offset_cb(Dwarf_Die *die_mem, void *arg)
>         if (offset == loc)
>                 return DIE_FIND_CB_END;
>
> -       die_get_real_type(die_mem, &type_die);
> +       if (die_get_real_type(die_mem, &type_die) == NULL) {
> +               // TODO: add a pr_debug_dtp() later for this unlikely failure
> +               return DIE_FIND_CB_SIBLING;
> +       }
>
>         if (dwarf_aggregate_size(&type_die, &size) < 0)
>                 size = 0;