[PATCH bpf 0/2] s390/bpf: Fix arch_prepare_bpf_trampoline

[Song Liu <song@kernel.org>]

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(-)

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2.34.1