Hi Quentin, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on kvmarm/next] [also build test WARNING on arm64/for-next/core linus/master v5.12-rc3 next-20210319] [cannot apply to linux/master] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Quentin-Perret/KVM-arm64-Stage-2... base: https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git next config: arm64-randconfig-r036-20210318 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project fcc1ce00931751ac02498986feb37744e9ace8de) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/0day-ci/linux/commit/d9cbcf8f8115531ae6333bb07ed1d8652... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Quentin-Perret/KVM-arm64-Stage-2-for-the-host/20210319-180524 git checkout d9cbcf8f8115531ae6333bb07ed1d865233e7e10 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): void __noreturn __pkvm_init_finalise(void) ^ arch/arm64/kvm/hyp/nvhe/setup.c:133:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void __noreturn __pkvm_init_finalise(void) ^ static 1 warning generated. vim +/__pkvm_init_finalise +133 arch/arm64/kvm/hyp/nvhe/setup.c 132 134 { 135 struct kvm_host_data *host_data = this_cpu_ptr(&kvm_host_data); 136 struct kvm_cpu_context *host_ctxt = &host_data->host_ctxt; 137 unsigned long nr_pages, reserved_pages, pfn; 138 int ret; 139 140 /* Now that the vmemmap is backed, install the full-fledged allocator */ 141 pfn = hyp_virt_to_pfn(hyp_pgt_base); 142 nr_pages = hyp_s1_pgtable_pages(); 143 reserved_pages = hyp_early_alloc_nr_used_pages(); 144 ret = hyp_pool_init(&hpool, pfn, nr_pages, reserved_pages); 145 if (ret) 146 goto out; 147 148 pkvm_pgtable_mm_ops = (struct kvm_pgtable_mm_ops) { 149 .zalloc_page = hyp_zalloc_hyp_page, 150 .phys_to_virt = hyp_phys_to_virt, 151 .virt_to_phys = hyp_virt_to_phys, 152 .get_page = hyp_get_page, 153 .put_page = hyp_put_page, 154 }; 155 pkvm_pgtable.mm_ops = &pkvm_pgtable_mm_ops; 156 157 out: 158 /* 159 * We tail-called to here from handle___pkvm_init() and will not return, 160 * so make sure to propagate the return value to the host. 161 */ 162 cpu_reg(host_ctxt, 1) = ret; 163 164 __host_enter(host_ctxt); 165 } 166 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org