reproduce (this is a W=1 build):
        # https://github.com/rgushchin/linux/commit/6ca307b436323286aa40a1bb61e3adb733abbc05
        git remote add rgushchin https://github.com/rgushchin/linux.git
        git fetch --no-tags rgushchin memcontrol_v1.1
        git checkout 6ca307b436323286aa40a1bb61e3adb733abbc05
        # 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