tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 11030fe96b57ad843518b0e9430f3cd4b3610ce2 commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces date: 7 weeks ago config: x86_64-randconfig-s031-20200809 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-118-ge1578773-dirty git checkout 670d0a4b10704667765f7d18f7592993d02783aa # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/edac/pnd2_edac.c:295:22: sparse: expected char *base drivers/edac/pnd2_edac.c:303:25: sparse: got char *base -- drivers/edac/i10nm_base.c:170:31: sparse: sparse: cast removes address space '__iomem' of expression drivers/edac/i10nm_base.c:171:37: sparse: sparse: cast removes address space '__iomem' of expression vim +295 drivers/edac/pnd2_edac.c 5c71ad17f97e84 Tony Luck 2017-03-09 262 29a3388bfcce7a Stephen Douthit 2019-08-09 263 #define DNV_MCHBAR_SIZE 0x8000 29a3388bfcce7a Stephen Douthit 2019-08-09 264 #define DNV_SB_PORT_SIZE 0x10000 5c71ad17f97e84 Tony Luck 2017-03-09 265 static int dnv_rd_reg(int port, int off, int op, void *data, size_t sz, char *name) 5c71ad17f97e84 Tony Luck 2017-03-09 266 { 5c71ad17f97e84 Tony Luck 2017-03-09 267 struct pci_dev *pdev; 5c71ad17f97e84 Tony Luck 2017-03-09 268 char *base; 5c71ad17f97e84 Tony Luck 2017-03-09 269 u64 addr; 29a3388bfcce7a Stephen Douthit 2019-08-09 270 unsigned long size; 5c71ad17f97e84 Tony Luck 2017-03-09 271 5c71ad17f97e84 Tony Luck 2017-03-09 272 if (op == 4) { 5c71ad17f97e84 Tony Luck 2017-03-09 273 pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 0x1980, NULL); 5c71ad17f97e84 Tony Luck 2017-03-09 274 if (!pdev) 5c71ad17f97e84 Tony Luck 2017-03-09 275 return -ENODEV; 5c71ad17f97e84 Tony Luck 2017-03-09 276 5c71ad17f97e84 Tony Luck 2017-03-09 277 pci_read_config_dword(pdev, off, data); 5c71ad17f97e84 Tony Luck 2017-03-09 278 pci_dev_put(pdev); 5c71ad17f97e84 Tony Luck 2017-03-09 279 } else { 5c71ad17f97e84 Tony Luck 2017-03-09 280 /* MMIO via memory controller hub base address */ 5c71ad17f97e84 Tony Luck 2017-03-09 281 if (op == 0 && port == 0x4c) { 5c71ad17f97e84 Tony Luck 2017-03-09 282 addr = get_mem_ctrl_hub_base_addr(); 5c71ad17f97e84 Tony Luck 2017-03-09 283 if (!addr) 5c71ad17f97e84 Tony Luck 2017-03-09 284 return -ENODEV; 29a3388bfcce7a Stephen Douthit 2019-08-09 285 size = DNV_MCHBAR_SIZE; 5c71ad17f97e84 Tony Luck 2017-03-09 286 } else { 5c71ad17f97e84 Tony Luck 2017-03-09 287 /* MMIO via sideband register base address */ 5c71ad17f97e84 Tony Luck 2017-03-09 288 addr = get_sideband_reg_base_addr(); 5c71ad17f97e84 Tony Luck 2017-03-09 289 if (!addr) 5c71ad17f97e84 Tony Luck 2017-03-09 290 return -ENODEV; 5c71ad17f97e84 Tony Luck 2017-03-09 291 addr += (port << 16); 29a3388bfcce7a Stephen Douthit 2019-08-09 292 size = DNV_SB_PORT_SIZE; 5c71ad17f97e84 Tony Luck 2017-03-09 293 } 5c71ad17f97e84 Tony Luck 2017-03-09 294 29a3388bfcce7a Stephen Douthit 2019-08-09 @295 base = ioremap((resource_size_t)addr, size); 5c71ad17f97e84 Tony Luck 2017-03-09 296 if (!base) 5c71ad17f97e84 Tony Luck 2017-03-09 297 return -ENODEV; 5c71ad17f97e84 Tony Luck 2017-03-09 298 5c71ad17f97e84 Tony Luck 2017-03-09 299 if (sz == 8) 5c71ad17f97e84 Tony Luck 2017-03-09 300 *(u32 *)(data + 4) = *(u32 *)(base + off + 4); 5c71ad17f97e84 Tony Luck 2017-03-09 301 *(u32 *)data = *(u32 *)(base + off); 5c71ad17f97e84 Tony Luck 2017-03-09 302 5c71ad17f97e84 Tony Luck 2017-03-09 @303 iounmap(base); 5c71ad17f97e84 Tony Luck 2017-03-09 304 } 5c71ad17f97e84 Tony Luck 2017-03-09 305 5c71ad17f97e84 Tony Luck 2017-03-09 306 edac_dbg(2, "Read %s=%.8x_%.8x\n", name, 5c71ad17f97e84 Tony Luck 2017-03-09 307 (sz == 8) ? *(u32 *)(data + 4) : 0, *(u32 *)data); 5c71ad17f97e84 Tony Luck 2017-03-09 308 5c71ad17f97e84 Tony Luck 2017-03-09 309 return 0; 5c71ad17f97e84 Tony Luck 2017-03-09 310 } 5c71ad17f97e84 Tony Luck 2017-03-09 311 :::::: The code at line 295 was first introduced by commit :::::: 29a3388bfcce7a6d087051376ea02bf8326a957b EDAC, pnd2: Fix ioremap() size in dnv_rd_reg() :::::: TO: Stephen Douthit <stephend(a)silicom-usa.com&gt; :::::: CC: Tony Luck <tony.luck(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org