Hi Greentime, I love your patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.8-rc2 next-20200623] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Greentime-Hu/riscv-Add-context-t... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git dd0d718152e4c65b173070d48ea9dfc06894c3e5 config: riscv-allyesconfig (attached as .config) compiler: riscv64-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv 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 >>): 129 | void arch_irq_work_raise(void) | ^~~~~~~~~~~~~~~~~~~ vim +/arch_irq_work_raise +129 arch/riscv/kernel/smp.c 127 128 #ifdef CONFIG_IRQ_WORK 130 { 131 send_ipi_single(smp_processor_id(), IPI_IRQ_WORK); 132 } 133 #endif 134 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org