reproduce (this is a W=1 build):
        # https://github.com/sean-jc/linux/commit/795a909ec2f52e8c835726445e2fe725f53639bd
        git remote add sean-jc https://github.com/sean-jc/linux
        git fetch --no-tags sean-jc x86/gmem_inplace
        git checkout 795a909ec2f52e8c835726445e2fe725f53639bd
        # install loongarch cross compiling tool for clang build
        # apt-get install binutils-loongarch-linux-gnu
        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=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch SHELL=/bin/bash