reproduce (this is a W=1 build):
        # https://github.com/sean-jc/linux/commit/12159515b6f2a33c1cdf0cd58802d5e03036ff02
        git remote add sean-jc https://github.com/sean-jc/linux
        git fetch --no-tags sean-jc x86/uaccess_bad_mm
        git checkout 12159515b6f2a33c1cdf0cd58802d5e03036ff02

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/kvm/