reproduce (this is a W=1 build): git clone https://github.com/intel/lkp-tests.git ~/lkp-tests # install arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/LuBaolu/intel-iommu/commit/d5026804d865698bd727f615117eed7f231b25a6 git remote add lubaolu-intel-iommu https://github.com/LuBaolu/intel-iommu.git git fetch --no-tags lubaolu-intel-iommu iommufd-io-pgfault-delivery-v4 git checkout d5026804d865698bd727f615117eed7f231b25a6 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/iommu/