From: Ian Rogers <irogers@google.com>
Date: Mon, 4 May 2026 08:12:23 +0000 (-0700)
Subject: perf libdw: Support DWARF line 0 in inline list
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=15f8c22c462b7670d3b047d46419a92f19819fc2;p=thirdparty%2Fkernel%2Fstable.git

perf libdw: Support DWARF line 0 in inline list

Allow DWARF line 0 in `libdw_a2l_cb()`, as it is a valid
reference for compiler-generated code.

Filter `die_get_call_lineno` error codes (negative values), but
fallback to line 0 if `call_fname` is present to preserve the
caller's filename instead of discarding it entirely.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Zecheng Li <zli94@ncsu.edu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---

diff --git a/tools/perf/util/libdw.c b/tools/perf/util/libdw.c
index 301642084c69..196b9cdf51b2 100644
--- a/tools/perf/util/libdw.c
+++ b/tools/perf/util/libdw.c
@@ -80,6 +80,7 @@ static int libdw_a2l_cb(Dwarf_Die *die, void *_args)
 	struct libdw_a2l_cb_args *args  = _args;
 	struct symbol *inline_sym = new_inline_sym(args->dso, args->sym, dwarf_diename(die));
 	const char *call_fname = die_get_call_file(die);
+	int call_lineno = die_get_call_lineno(die);
 	char *call_srcline = srcline__unknown;
 
 	if (!inline_sym)
@@ -87,7 +88,7 @@ static int libdw_a2l_cb(Dwarf_Die *die, void *_args)
 
 	/* Assign caller information to the parent. */
 	if (call_fname)
-		call_srcline = srcline_from_fileline(call_fname, die_get_call_lineno(die));
+		call_srcline = srcline_from_fileline(call_fname, call_lineno >= 0 ? call_lineno : 0);
 
 	if (!list_empty(&args->node->val)) {
 		struct inline_list *parent;