Hi Zhu, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on mst-vhost/linux-next] [also build test WARNING on horms-ipvs/master linus/master v5.17-rc1 next-20220125] [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/vDPA-ifcvf-implemen... base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next config: arm-randconfig-c002-20220124 (https://download.01.org/0day-ci/archive/20220126/202201260245.1yTB6YwE-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 997e128e2a78f5a5434fc75997441ae1ee76f8a4) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/0day-ci/linux/commit/9242eae873643db8562d24857da7d05a2... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Zhu-Lingshan/vDPA-ifcvf-implement-shared-IRQ-feature/20220125-174020 git checkout 9242eae873643db8562d24857da7d05a2950ecfe # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/vhost/ 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 >>): if (irq < 0) ^~~ drivers/vhost/vdpa.c:94:14: note: initialize the variable 'irq' to silence this warning int ret, irq; ^ = 0 1 warning generated. vim +/irq +99 drivers/vhost/vdpa.c 88 89 static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid) 90 { 91 struct vhost_virtqueue *vq = &v->vqs[qid]; 92 const struct vdpa_config_ops *ops = v->vdpa->config; 93 struct vdpa_device *vdpa = v->vdpa; 94 int ret, irq; 95 96 if (!ops->get_vq_irq) 97 return; 98 100 return; 101 102 irq = ops->get_vq_irq(vdpa, qid); 103 irq_bypass_unregister_producer(&vq->call_ctx.producer); 104 if (!vq->call_ctx.ctx || irq < 0) 105 return; 106 107 vq->call_ctx.producer.token = vq->call_ctx.ctx; 108 vq->call_ctx.producer.irq = irq; 109 ret = irq_bypass_register_producer(&vq->call_ctx.producer); 110 if (unlikely(ret)) 111 dev_info(&v->dev, "vq %u, irq bypass producer (token %p) registration fails, ret = %d\n", 112 qid, vq->call_ctx.producer.token, ret); 113 } 114 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org