reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/iwlwifi-next.git/commit/?id=e1650f3f7a57295eb773434169d90fc5a87db97a
        git remote add iwlwifi-next https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/iwlwifi-next.git
        git fetch --no-tags iwlwifi-next nan_mac80211_phase2
        git checkout e1650f3f7a57295eb773434169d90fc5a87db97a

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/net/wireless/virtual/