Hi Zhu, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on vhost/linux-next] [also build test WARNING on kvm/linux-next linus/master v5.8-rc5 next-20200716] [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/Zhu-Lingshan/IRQ-offloading-for-... base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next config: openrisc-randconfig-r016-20200717 (attached as .config) compiler: or1k-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=openrisc 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 >>): drivers/vhost/vdpa.c: In function 'vhost_vdpa_setup_vq_irq': 122 | int ret; | ^~~ vim +/ret +122 drivers/vhost/vdpa.c 117 118 static void vhost_vdpa_setup_vq_irq(struct vdpa_device *dev, int qid, int irq) 119 { 120 struct vhost_vdpa *v = vdpa_get_drvdata(dev); 121 struct vhost_virtqueue *vq = &v->vqs[qid]; 123 124 spin_lock(&vq->call_ctx.ctx_lock); 125 if (!vq->call_ctx.ctx) { 126 spin_unlock(&vq->call_ctx.ctx_lock); 127 return; 128 } 129 130 vq->call_ctx.producer.token = vq->call_ctx.ctx; 131 vq->call_ctx.producer.irq = irq; 132 ret = irq_bypass_register_producer(&vq->call_ctx.producer); 133 spin_unlock(&vq->call_ctx.ctx_lock); 134 } 135 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org