Hi Stefano, I love your patch! Perhaps something to improve: [auto build test WARNING on mst-vhost/linux-next] [also build test WARNING on linus/master next-20230303] [cannot apply to v6.2] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Stefano-Garzarella/vdpa-add-bind_mm-unbind_mm-callbacks/20230302-193850 base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next patch link: https://lore.kernel.org/r/20230302113421.174582-7-sgarzare%40redhat.com patch subject: [PATCH v2 6/8] vdpa_sim: use kthread worker config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20230305/202303051841.bPAIzJRy-lkp@xxxxxxxxx/config) compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1) 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 # https://github.com/intel-lab-lkp/linux/commit/5b2107457ac0e7b1bb0aa3635ebf13b02e82bb78 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Stefano-Garzarella/vdpa-add-bind_mm-unbind_mm-callbacks/20230302-193850 git checkout 5b2107457ac0e7b1bb0aa3635ebf13b02e82bb78 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/net/wireless/ath/ath10k/ drivers/vdpa/vdpa_sim/ fs/erofs/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202303051841.bPAIzJRy-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> drivers/vdpa/vdpa_sim/vdpa_sim.c:166:6: warning: variable 'dev' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] if (IS_ERR(vdpasim->worker)) ^~~~~~~~~~~~~~~~~~~~~~~ drivers/vdpa/vdpa_sim/vdpa_sim.c:213:13: note: uninitialized use occurs here put_device(dev); ^~~ drivers/vdpa/vdpa_sim/vdpa_sim.c:166:2: note: remove the 'if' if its condition is always false if (IS_ERR(vdpasim->worker)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/vdpa/vdpa_sim/vdpa_sim.c:132:20: note: initialize the variable 'dev' to silence this warning struct device *dev; ^ = NULL 1 warning generated. vim +166 drivers/vdpa/vdpa_sim/vdpa_sim.c 125 126 struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr, 127 const struct vdpa_dev_set_config *config) 128 { 129 const struct vdpa_config_ops *ops; 130 struct vdpa_device *vdpa; 131 struct vdpasim *vdpasim; 132 struct device *dev; 133 int i, ret = -ENOMEM; 134 135 if (!dev_attr->alloc_size) 136 return ERR_PTR(-EINVAL); 137 138 if (config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) { 139 if (config->device_features & 140 ~dev_attr->supported_features) 141 return ERR_PTR(-EINVAL); 142 dev_attr->supported_features = 143 config->device_features; 144 } 145 146 if (batch_mapping) 147 ops = &vdpasim_batch_config_ops; 148 else 149 ops = &vdpasim_config_ops; 150 151 vdpa = __vdpa_alloc_device(NULL, ops, 152 dev_attr->ngroups, dev_attr->nas, 153 dev_attr->alloc_size, 154 dev_attr->name, false); 155 if (IS_ERR(vdpa)) { 156 ret = PTR_ERR(vdpa); 157 goto err_alloc; 158 } 159 160 vdpasim = vdpa_to_sim(vdpa); 161 vdpasim->dev_attr = *dev_attr; 162 163 kthread_init_work(&vdpasim->work, vdpasim_work_fn); 164 vdpasim->worker = kthread_create_worker(0, "vDPA sim worker: %s", 165 dev_attr->name); > 166 if (IS_ERR(vdpasim->worker)) 167 goto err_iommu; 168 169 spin_lock_init(&vdpasim->lock); 170 spin_lock_init(&vdpasim->iommu_lock); 171 172 dev = &vdpasim->vdpa.dev; 173 dev->dma_mask = &dev->coherent_dma_mask; 174 if (dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64))) 175 goto err_iommu; 176 vdpasim->vdpa.mdev = dev_attr->mgmt_dev; 177 178 vdpasim->config = kzalloc(dev_attr->config_size, GFP_KERNEL); 179 if (!vdpasim->config) 180 goto err_iommu; 181 182 vdpasim->vqs = kcalloc(dev_attr->nvqs, sizeof(struct vdpasim_virtqueue), 183 GFP_KERNEL); 184 if (!vdpasim->vqs) 185 goto err_iommu; 186 187 vdpasim->iommu = kmalloc_array(vdpasim->dev_attr.nas, 188 sizeof(*vdpasim->iommu), GFP_KERNEL); 189 if (!vdpasim->iommu) 190 goto err_iommu; 191 192 vdpasim->iommu_pt = kmalloc_array(vdpasim->dev_attr.nas, 193 sizeof(*vdpasim->iommu_pt), GFP_KERNEL); 194 if (!vdpasim->iommu_pt) 195 goto err_iommu; 196 197 for (i = 0; i < vdpasim->dev_attr.nas; i++) 198 vhost_iotlb_init(&vdpasim->iommu[i], max_iotlb_entries, 0); 199 200 vdpasim->buffer = kvmalloc(dev_attr->buffer_size, GFP_KERNEL); 201 if (!vdpasim->buffer) 202 goto err_iommu; 203 204 for (i = 0; i < dev_attr->nvqs; i++) 205 vringh_set_iotlb(&vdpasim->vqs[i].vring, &vdpasim->iommu[0], 206 &vdpasim->iommu_lock); 207 208 vdpasim->vdpa.dma_dev = dev; 209 210 return vdpasim; 211 212 err_iommu: 213 put_device(dev); 214 err_alloc: 215 return ERR_PTR(ret); 216 } 217 EXPORT_SYMBOL_GPL(vdpasim_create); 218 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
