tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 6a70f89cc58f2368efa055cbcbd8b37384f6c588 commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces date: 4 weeks ago config: i386-randconfig-s002-20200718 (attached as .config) compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-49-g707c5017-dirty git checkout 670d0a4b10704667765f7d18f7592993d02783aa # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 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 >>) arch/x86/kernel/tboot.c:481:16: sparse: expected void *config arch/x86/kernel/tboot.c:487:19: sparse: expected void *heap_base arch/x86/kernel/tboot.c:487:19: sparse: got void [noderef] __iomem * arch/x86/kernel/tboot.c:489:17: sparse: got void *config vim +481 arch/x86/kernel/tboot.c 3162534069597e Joseph Cihula 2009-06-30 467 3162534069597e Joseph Cihula 2009-06-30 468 struct acpi_table_header *tboot_get_dmar_table(struct acpi_table_header *dmar_tbl) 3162534069597e Joseph Cihula 2009-06-30 469 { 3162534069597e Joseph Cihula 2009-06-30 470 void *heap_base, *heap_ptr, *config; 3162534069597e Joseph Cihula 2009-06-30 471 3162534069597e Joseph Cihula 2009-06-30 472 if (!tboot_enabled()) 3162534069597e Joseph Cihula 2009-06-30 473 return dmar_tbl; 3162534069597e Joseph Cihula 2009-06-30 474 3162534069597e Joseph Cihula 2009-06-30 475 /* 3162534069597e Joseph Cihula 2009-06-30 476 * ACPI tables may not be DMA protected by tboot, so use DMAR copy 3162534069597e Joseph Cihula 2009-06-30 477 * SINIT saved in SinitMleData in TXT heap (which is DMA protected) 3162534069597e Joseph Cihula 2009-06-30 478 */ 3162534069597e Joseph Cihula 2009-06-30 479 3162534069597e Joseph Cihula 2009-06-30 480 /* map config space in order to get heap addr */ 3162534069597e Joseph Cihula 2009-06-30 @481 config = ioremap(TXT_PUB_CONFIG_REGS_BASE, NR_TXT_CONFIG_PAGES * 3162534069597e Joseph Cihula 2009-06-30 482 PAGE_SIZE); 3162534069597e Joseph Cihula 2009-06-30 483 if (!config) 3162534069597e Joseph Cihula 2009-06-30 484 return NULL; 3162534069597e Joseph Cihula 2009-06-30 485 3162534069597e Joseph Cihula 2009-06-30 486 /* now map TXT heap */ 3162534069597e Joseph Cihula 2009-06-30 @487 heap_base = ioremap(*(u64 *)(config + TXTCR_HEAP_BASE), 3162534069597e Joseph Cihula 2009-06-30 488 *(u64 *)(config + TXTCR_HEAP_SIZE)); 3162534069597e Joseph Cihula 2009-06-30 @489 iounmap(config); 3162534069597e Joseph Cihula 2009-06-30 490 if (!heap_base) 3162534069597e Joseph Cihula 2009-06-30 491 return NULL; 3162534069597e Joseph Cihula 2009-06-30 492 3162534069597e Joseph Cihula 2009-06-30 493 /* walk heap to SinitMleData */ 3162534069597e Joseph Cihula 2009-06-30 494 /* skip BiosData */ 3162534069597e Joseph Cihula 2009-06-30 495 heap_ptr = heap_base + *(u64 *)heap_base; 3162534069597e Joseph Cihula 2009-06-30 496 /* skip OsMleData */ 3162534069597e Joseph Cihula 2009-06-30 497 heap_ptr += *(u64 *)heap_ptr; 3162534069597e Joseph Cihula 2009-06-30 498 /* skip OsSinitData */ 3162534069597e Joseph Cihula 2009-06-30 499 heap_ptr += *(u64 *)heap_ptr; 3162534069597e Joseph Cihula 2009-06-30 500 /* now points to SinitMleDataSize; set to SinitMleData */ 3162534069597e Joseph Cihula 2009-06-30 501 heap_ptr += sizeof(u64); 3162534069597e Joseph Cihula 2009-06-30 502 /* get addr of DMAR table */ 3162534069597e Joseph Cihula 2009-06-30 503 dmar_tbl = (struct acpi_table_header *)(heap_ptr + 3162534069597e Joseph Cihula 2009-06-30 504 ((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off - 3162534069597e Joseph Cihula 2009-06-30 505 sizeof(u64)); 3162534069597e Joseph Cihula 2009-06-30 506 3162534069597e Joseph Cihula 2009-06-30 507 /* don't unmap heap because dmar.c needs access to this */ 3162534069597e Joseph Cihula 2009-06-30 508 3162534069597e Joseph Cihula 2009-06-30 509 return dmar_tbl; 3162534069597e Joseph Cihula 2009-06-30 510 } 3162534069597e Joseph Cihula 2009-06-30 511 :::::: The code at line 481 was first introduced by commit :::::: 3162534069597e34dd0ac9eb711be8dc23835ae7 x86, intel_txt: Intel TXT boot support :::::: TO: Joseph Cihula <joseph.cihula(a)intel.com&gt; :::::: CC: H. Peter Anvin <hpa(a)zytor.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org