Hi Zhu, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.12 next-20210428] [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-implement-doorbell-mapping-feature/20210428-162843 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git acd3d28594536e9096c1ea76c5867d8a68babef6 config: x86_64-randconfig-s022-20210428 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://github.com/0day-ci/linux/commit/79474dca6dd202684180ad6ea88b5f73fc4a87c2 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Zhu-Lingshan/vDPA-ifcvf-implement-doorbell-mapping-feature/20210428-162843 git checkout 79474dca6dd202684180ad6ea88b5f73fc4a87c2 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> sparse warnings: (new ones prefixed by >>) >> drivers/vdpa/ifcvf/ifcvf_base.c:136:80: sparse: sparse: restricted __le32 degrades to integer vim +136 drivers/vdpa/ifcvf/ifcvf_base.c 98 99 int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *pdev) 100 { 101 struct virtio_pci_cap cap; 102 u16 notify_off; 103 int ret; 104 u8 pos; 105 u32 i; 106 107 ret = pci_read_config_byte(pdev, PCI_CAPABILITY_LIST, &pos); 108 if (ret < 0) { 109 IFCVF_ERR(pdev, "Failed to read PCI capability list\n"); 110 return -EIO; 111 } 112 113 while (pos) { 114 ret = ifcvf_read_config_range(pdev, (u32 *)&cap, 115 sizeof(cap), pos); 116 if (ret < 0) { 117 IFCVF_ERR(pdev, 118 "Failed to get PCI capability at %x\n", pos); 119 break; 120 } 121 122 if (cap.cap_vndr != PCI_CAP_ID_VNDR) 123 goto next; 124 125 switch (cap.cfg_type) { 126 case VIRTIO_PCI_CAP_COMMON_CFG: 127 hw->common_cfg = get_cap_addr(hw, &cap); 128 IFCVF_DBG(pdev, "hw->common_cfg = %p\n", 129 hw->common_cfg); 130 break; 131 case VIRTIO_PCI_CAP_NOTIFY_CFG: 132 pci_read_config_dword(pdev, pos + sizeof(cap), 133 &hw->notify_off_multiplier); 134 hw->notify_bar = cap.bar; 135 hw->notify_base = get_cap_addr(hw, &cap); > 136 hw->notify_pa = pci_resource_start(pdev, cap.bar) + cap.offset; 137 IFCVF_DBG(pdev, "hw->notify_base = %p\n", 138 hw->notify_base); 139 break; 140 case VIRTIO_PCI_CAP_ISR_CFG: 141 hw->isr = get_cap_addr(hw, &cap); 142 IFCVF_DBG(pdev, "hw->isr = %p\n", hw->isr); 143 break; 144 case VIRTIO_PCI_CAP_DEVICE_CFG: 145 hw->net_cfg = get_cap_addr(hw, &cap); 146 IFCVF_DBG(pdev, "hw->net_cfg = %p\n", hw->net_cfg); 147 break; 148 } 149 150 next: 151 pos = cap.cap_next; 152 } 153 154 if (hw->common_cfg == NULL || hw->notify_base == NULL || 155 hw->isr == NULL || hw->net_cfg == NULL) { 156 IFCVF_ERR(pdev, "Incomplete PCI capabilities\n"); 157 return -EIO; 158 } 159 160 for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) { 161 ifc_iowrite16(i, &hw->common_cfg->queue_select); 162 notify_off = ifc_ioread16(&hw->common_cfg->queue_notify_off); 163 hw->vring[i].notify_addr = hw->notify_base + 164 notify_off * hw->notify_off_multiplier; 165 } 166 167 hw->lm_cfg = hw->base[IFCVF_LM_BAR]; 168 169 IFCVF_DBG(pdev, 170 "PCI capability mapping: common cfg: %p, notify base: %p\n, isr cfg: %p, device cfg: %p, multiplier: %u\n", 171 hw->common_cfg, hw->notify_base, hw->isr, 172 hw->net_cfg, hw->notify_off_multiplier); 173 174 return 0; 175 } 176 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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