tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: 87241c08286384feb3ddc57d4cb0daca4be1e384 commit: 2c840ffbad347c1ba1059dc5b50de9fb26141c06 [26/9195] trusty: Add interrupt support config: x86_64-randconfig-r023-20200811 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 4f2ad15db535873dda9bfe248a2771023b64a43c) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 2c840ffbad347c1ba1059dc5b50de9fb26141c06 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): irqreturn_t trusty_irq_handler(int irq, void *data) ^ drivers/trusty/trusty-irq.c:172:1: note: declare 'static' if the function is not intended to be used outside of this translation unit irqreturn_t trusty_irq_handler(int irq, void *data) ^ static drivers/trusty/trusty-irq.c:238:20: error: use of undeclared identifier 'CPU_TASKS_FROZEN' switch (action & ~CPU_TASKS_FROZEN) { ^ drivers/trusty/trusty-irq.c:448:8: error: implicit declaration of function 'register_hotcpu_notifier' [-Werror,-Wimplicit-function-declaration] ret = register_hotcpu_notifier(&is->cpu_notifier); ^ drivers/trusty/trusty-irq.c:448:8: note: did you mean 'register_module_notifier'? include/linux/module.h:662:5: note: 'register_module_notifier' declared here int register_module_notifier(struct notifier_block *nb); ^ drivers/trusty/trusty-irq.c:453:6: error: assigning to 'int' from incompatible type 'void' ret = on_each_cpu(trusty_irq_cpu_up, is, 0); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/trusty/trusty-irq.c:462:2: error: implicit declaration of function 'unregister_hotcpu_notifier' [-Werror,-Wimplicit-function-declaration] unregister_hotcpu_notifier(&is->cpu_notifier); ^ drivers/trusty/trusty-irq.c:462:2: note: did you mean 'register_hotcpu_notifier'? drivers/trusty/trusty-irq.c:448:8: note: 'register_hotcpu_notifier' declared here ret = register_hotcpu_notifier(&is->cpu_notifier); ^ drivers/trusty/trusty-irq.c:496:2: error: implicit declaration of function 'unregister_hotcpu_notifier' [-Werror,-Wimplicit-function-declaration] unregister_hotcpu_notifier(&is->cpu_notifier); ^ drivers/trusty/trusty-irq.c:497:6: error: assigning to 'int' from incompatible type 'void' ret = on_each_cpu(trusty_irq_cpu_down, is, 1); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/trusty/trusty-irq.c:239:7: error: use of undeclared identifier 'CPU_STARTING' case CPU_STARTING: ^ drivers/trusty/trusty-irq.c:242:7: error: use of undeclared identifier 'CPU_DYING' case CPU_DYING: ^ 1 warning and 8 errors generated. vim +/trusty_irq_handler +172 drivers/trusty/trusty-irq.c 171 173 { 174 struct trusty_irq *trusty_irq = data; 175 struct trusty_irq_state *is = trusty_irq->is; 176 struct trusty_irq_work *trusty_irq_work = this_cpu_ptr(is->irq_work); 177 struct trusty_irq_irqset *irqset; 178 179 dev_dbg(is->dev, "%s: irq %d, percpu %d, cpu %d, enable %d\n", 180 __func__, irq, trusty_irq->irq, smp_processor_id(), 181 trusty_irq->enable); 182 183 if (trusty_irq->percpu) { 184 disable_percpu_irq(irq); 185 irqset = this_cpu_ptr(is->percpu_irqs); 186 } else { 187 disable_irq_nosync(irq); 188 irqset = &is->normal_irqs; 189 } 190 191 spin_lock(&is->normal_irqs_lock); 192 if (trusty_irq->enable) { 193 hlist_del(&trusty_irq->node); 194 hlist_add_head(&trusty_irq->node, &irqset->pending); 195 } 196 spin_unlock(&is->normal_irqs_lock); 197 198 schedule_work_on(raw_smp_processor_id(), &trusty_irq_work->work); 199 200 dev_dbg(is->dev, "%s: irq %d done\n", __func__, irq); 201 202 return IRQ_HANDLED; 203 } 204 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org