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

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Date: Tue, 19 Mar 2024 15:19:14 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...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 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?

- 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;