reproduce (this is a W=1 build):
        # https://github.com/alexshi/linux/commit/386f1b7775e9cb78a7126eb6d39d46c6c43f1e90
        git remote add alexshi https://github.com/alexshi/linux.git
        git fetch --no-tags alexshi cpusetisolation
        git checkout 386f1b7775e9cb78a7126eb6d39d46c6c43f1e90
        # 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 kernel/