linux-kernel - [PATCH v1 1/2] perf bpf-event: Use libbpf version rather than feature check

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Message-ID: <20251003012349.2396685-1-irogers@google.com>
Date: Thu,  2 Oct 2025 18:23:48 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Blake Jones <blakejones@...gle.com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH v1 1/2] perf bpf-event: Use libbpf version rather than feature check

The feature check guarded the -DHAVE_LIBBPF_STRINGS_SUPPORT is
unnecessary as it is sufficient and easier to use the
LIBBPF_CURRENT_VERSION_GEQ macro.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/Makefile.config  | 7 -------
 tools/perf/builtin-check.c  | 1 +
 tools/perf/util/bpf-event.c | 2 --
 tools/perf/util/bpf-utils.h | 5 +++++
 4 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 6cdb96576cb8..b0e15721c5a5 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -596,13 +596,6 @@ ifndef NO_LIBELF
 	  LIBBPF_INCLUDE = $(LIBBPF_DIR)/..
         endif
       endif
-
-      FEATURE_CHECK_CFLAGS-libbpf-strings="-I$(LIBBPF_INCLUDE)"
-      $(call feature_check,libbpf-strings)
-      ifeq ($(feature-libbpf-strings), 1)
-        $(call detected,CONFIG_LIBBPF_STRINGS)
-        CFLAGS += -DHAVE_LIBBPF_STRINGS_SUPPORT
-      endif
     endif
   endif # NO_LIBBPF
 endif # NO_LIBELF
diff --git a/tools/perf/builtin-check.c b/tools/perf/builtin-check.c
index 7fd054760e47..8c0668911fb1 100644
--- a/tools/perf/builtin-check.c
+++ b/tools/perf/builtin-check.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #include "builtin.h"
 #include "color.h"
+#include "util/bpf-utils.h"
 #include "util/debug.h"
 #include "util/header.h"
 #include <tools/config.h>
diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
index 59f84aef91b4..2298cd396c42 100644
--- a/tools/perf/util/bpf-event.c
+++ b/tools/perf/util/bpf-event.c
@@ -288,9 +288,7 @@ 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;
diff --git a/tools/perf/util/bpf-utils.h b/tools/perf/util/bpf-utils.h
index eafc43b8731f..a8bc1a232968 100644
--- a/tools/perf/util/bpf-utils.h
+++ b/tools/perf/util/bpf-utils.h
@@ -14,6 +14,11 @@
        (LIBBPF_MAJOR_VERSION > (major) ||                              \
         (LIBBPF_MAJOR_VERSION == (major) && LIBBPF_MINOR_VERSION >= (minor)))
 
+#if LIBBPF_CURRENT_VERSION_GEQ(1, 7)
+// libbpf 1.7+ support the btf_dump_type_data_opts.emit_strings option.
+#define HAVE_LIBBPF_STRINGS_SUPPORT 1
+#endif
+
 /*
  * Get bpf_prog_info in continuous memory
  *
-- 
2.51.0.618.g983fd99d29-goog