reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc.git/commit/?id=42ab09253e0220d27a6afdbbba62169b3544405a
        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 42ab09253e0220d27a6afdbbba62169b3544405a
        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