reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/superm1/linux.git/commit/?id=6c3b56339488b6cca212f68096519d3c009c31e1
        git remote add amd-pstate https://git.kernel.org/pub/scm/linux/kernel/git/superm1/linux.git
        git fetch --no-tags amd-pstate bleeding-edge
        git checkout 6c3b56339488b6cca212f68096519d3c009c31e1
        # 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