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

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash mm/