reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git/commit/?id=1c9b80c2e5ca502bc305922729b49e156dcdf6da
        git remote add conor https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git
        git fetch --no-tags conor qwip
        git checkout 1c9b80c2e5ca502bc305922729b49e156dcdf6da
        # 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/