reproduce (this is a W=1 build):
        # https://github.com/norov/linux/commit/e050789716ae9a0daf3968328b49d6410e1e351d
        git remote add norov https://github.com/norov/linux
        git fetch --no-tags norov cpumask_next2
        git checkout e050789716ae9a0daf3968328b49d6410e1e351d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/net/