reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc.git/commit/?id=cd5e8cec9db02e60739206da2619ececfb468ae2
        git remote add ak-misc https://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc.git
        git fetch --no-tags ak-misc perf/brstack-resolve-1
        git checkout cd5e8cec9db02e60739206da2619ececfb468ae2
        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