reproduce:
        # https://github.com/qais-yousef/linux/commit/05441ef50df2e5195435b09974271f382d8f946d
        git remote add qais-yousef https://github.com/qais-yousef/linux
        git fetch --no-tags qais-yousef uclamp-max-aggregation
        git checkout 05441ef50df2e5195435b09974271f382d8f946d
        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