reproduce:
        git remote add android-common https://android.googlesource.com/kernel/common
        git fetch --no-tags android-common android16-6.12-kminext
        git checkout 32c1bffe815c9ed746ce7d84cae07da17db6bca4
        make W=1 O=/tmp/kselftest headers
        make W=1 O=/tmp/kselftest
        make W=1 O=/tmp/kselftest -C tools/testing/selftests
        make W=1 O=/tmp/kselftest -C tools/testing/selftests/bpf