It is possible to call a kfunc within a raw tp_btf program but not possible within a normal tracepoint program. Currently, it seems the verifier receives -EACCESS from fetch_kfunc_meta() as a result of not finding any hook within btf_kfunc_id_set_contains(). The first patch exposes the issue (as a selftest) while the second patch updates the kfunc hook lookup to account for tracepoint programs. Pre-submission CI run: https://github.com/kernel-patches/bpf/pull/7539 JP Kobryn (2): bpf/selftests: coverage for calling kfuncs within tracepoint bpf: allow kfuncs within normal tracepoint programs kernel/bpf/btf.c | 1 + .../selftests/bpf/prog_tests/kfunc_in_tp.c | 34 ++++++++++++++++++ .../selftests/bpf/progs/test_kfunc_in_tp.c | 35 +++++++++++++++++++ 3 files changed, 70 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/kfunc_in_tp.c create mode 100644 tools/testing/selftests/bpf/progs/test_kfunc_in_tp.c -- 2.46.0
