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Date:   Wed,  2 Nov 2022 21:54:35 -0700
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Subject: [PATCH v1 5/7] perf trace: empty fix libbpf 1.0+ compatibility
From:   Ian Rogers <irogers@google.com>
To:     Leo Yan <leo.yan@linaro.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Stephane Eranian <eranian@google.com>,
        Ian Rogers <irogers@google.com>
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Avoid use of tools/perf/include/bpf/bpf.h and use the more regular BPF
headers.  Add raw_syscalls:sys_enter to avoid the evlist being empty.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/examples/bpf/empty.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/perf/examples/bpf/empty.c b/tools/perf/examples/bpf/empty.c
index 7d7fb0c9fe76..3e296c0c53d7 100644
--- a/tools/perf/examples/bpf/empty.c
+++ b/tools/perf/examples/bpf/empty.c
@@ -1,3 +1,12 @@
-#include <bpf/bpf.h>
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
 
-license(GPL);
+struct syscall_enter_args;
+
+SEC("raw_syscalls:sys_enter")
+int sys_enter(struct syscall_enter_args *args)
+{
+	return 0;
+}
+char _license[] SEC("license") = "GPL";
-- 
2.38.1.273.g43a17bfeac-goog