reproduce (this is a W=1 build): git clone https://github.com/intel/lkp-tests.git ~/lkp-tests # install s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git/commit/?id=bee8a3e4e5747f9458cc5aa8eb0a0c146317cda2 git remote add jlayton https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git git fetch --no-tags jlayton dir-deleg git checkout bee8a3e4e5747f9458cc5aa8eb0a0c146317cda2 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash fs/nfsd/