linux-kernel - [PATCH 2/2] perf bpf: Check libbpf version to use btf_dump_type_data_opts.emit

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Message-ID: <20250919210654.317656-3-acme@kernel.org>
Date: Fri, 19 Sep 2025 18:06:54 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	James Clark <james.clark@...aro.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Clark Williams <williams@...hat.com>,
	linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Andrii Nakryiko <andrii@...nel.org>
Subject: [PATCH 2/2] perf bpf: Check libbpf version to use btf_dump_type_data_opts.emit_strings

From: Arnaldo Carvalho de Melo <acme@...hat.com>

When building perf with LIBBPF_DINAMIC=1 on a fedora system with
libbpf-devel 1.5 I it was breaking with:

util/bpf-event.c: In function ‘format_btf_variable’:
util/bpf-event.c:291:18: error: ‘const struct btf_dump_type_data_opts’ has no member named ‘emit_strings’
  291 |                 .emit_strings = 1,
      |                  ^~~~~~~~~~~~
util/bpf-event.c:291:33: error: initialized field overwritten [-Werror=override-init]
  291 |                 .emit_strings = 1,
      |                                 ^
util/bpf-event.c:291:33: note: (near initialization for ‘opts.skip_names’)

Check the version before using that feature.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Andrii Nakryiko <andrii@...nel.org>
Cc: Ian Rogers <irogers@...gle.com>
Cc: James Clark <james.clark@...aro.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Kan Liang <kan.liang@...ux.intel.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/bpf-event.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
index 2298cd396c4235e2..59f84aef91b4a2ec 100644
--- a/tools/perf/util/bpf-event.c
+++ b/tools/perf/util/bpf-event.c
@@ -288,7 +288,9 @@ static void format_btf_variable(struct btf *btf, char *buf, size_t buf_size,
 		.sz = sizeof(struct btf_dump_type_data_opts),
 		.skip_names = 1,
 		.compact = 1,
+#if LIBBPF_CURRENT_VERSION_GEQ(1, 7)
 		.emit_strings = 1,
+#endif
 	};
 	struct btf_dump *d;
 	size_t btf_size;
-- 
2.51.0