reproduce:
        git checkout ddb4c3f25b7b95df3d6932db0b379d768a6ebdf7
        b4 shazam https://lore.kernel.org/r/20240504044336.14411-1-jhubbard@nvidia.com
        make W=1 O=/tmp/kselftest headers
        make W=1 O=/tmp/kselftest -C tools/testing/selftests
        make W=1 O=/tmp/kselftest -C tools/testing/selftests/bpf