While working on trampoline, I found s390's arch_prepare_bpf_trampoline returns 0 on success, which breaks struct_ops. However, the CI doesn't catch this issue. Turns out test_progs:bpf_tcp_ca doesn't really test members of a struct_ops are actually called via the trampolines. 1/2 fixes arch_prepare_bpf_trampoline for s390. 2/2 adds a check to test_progs:bpf_tcp_ca to verify bpf_cubic_acked() is indeed called by the trampoline. Without 1/2, this check would fail on s390. Song Liu (2): s390/bpf: Let arch_prepare_bpf_trampoline return program size selftests/bpf: Check bpf_cubic_acked() is called via struct_ops arch/s390/net/bpf_jit_comp.c | 2 +- tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c | 2 ++ tools/testing/selftests/bpf/progs/bpf_cubic.c | 3 +++ 3 files changed, 6 insertions(+), 1 deletion(-) -- 2.34.1
