reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/9d4dde17d9bbfd6739f223d0dcd79a76b445abcc
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review deepakraog/selftests-proc-expand-smaps-field-coverage-and-require-TMPFS/20260715-235653
        git checkout 9d4dde17d9bbfd6739f223d0dcd79a76b445abcc

        # clang-24 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=$HOME/0day COMPILER=clang-24 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-24 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash mm/