reproduce (this is a W=1 build):
        # https://github.com/norov/linux/commit/6fb390cff19244a617ca75c1f3bedfa2a3116268
        git remote add norov https://github.com/norov/linux
        git fetch --no-tags norov find_first_size
        git checkout 6fb390cff19244a617ca75c1f3bedfa2a3116268
        # install loongarch cross compiling tool for clang build
        # apt-get install binutils-loongarch-linux-gnu
        # clang-22 might not be officially released. Try a lower version if installation fails.
        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=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch SHELL=/bin/bash drivers/perf/