tree: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git acpica-osl head: cfc2a23e4be42e58a453502acaf4a6330ef32f5f commit: cfc2a23e4be42e58a453502acaf4a6330ef32f5f [2/2] ACPI: OSL: Add support for deferred unmapping of ACPI memory config: i386-randconfig-s031-20200614 (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.1-250-g42323db3-dirty git checkout cfc2a23e4be42e58a453502acaf4a6330ef32f5f # save the attached .config to linux build tree make W=1 C=1 ARCH=i386 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): drivers/acpi/osl.c: In function 'acpi_os_vprintf': drivers/acpi/osl.c:153:2: warning: function 'acpi_os_vprintf' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 153 | vsprintf(buffer, fmt, args); | ^~~~~~~~ drivers/acpi/osl.c: In function 'acpi_os_unmap_generic_address': 533 | refcount = acpi_os_drop_map_ref(map); | ^~~~~~~~~~~~~~~~~~~~ 537 | acpi_os_map_cleanup(map); | ^~~~~~~~~~~~~~~~~~~ | acpi_os_map_memory cc1: some warnings being treated as errors sparse warnings: (new ones prefixed by >>) drivers/acpi/osl.c:375:17: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/acpi/osl.c:533:20: sparse: sparse: undefined identifier 'acpi_os_drop_map_ref' drivers/acpi/osl.c:537:17: sparse: sparse: undefined identifier 'acpi_os_map_cleanup' drivers/acpi/osl.c:757:1: sparse: sparse: context imbalance in 'acpi_os_read_memory' - wrong count at exit drivers/acpi/osl.c:790:1: sparse: sparse: context imbalance in 'acpi_os_write_memory' - wrong count at exit vim +/acpi_os_drop_map_ref +533 drivers/acpi/osl.c 620242ae8c3d9c Myron Stowe 2010-10-21 466 cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 467 /** cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 468 * acpi_os_unmap_deferred - Drop a memory mapping reference. cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 469 * @virt: Start of the address range to drop a reference to. cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 470 * @size: Size of the address range to drop a reference to. cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 471 * cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 472 * Look up the given virtual address range in the list of existing ACPI memory cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 473 * mappings, drop a reference to it and if there are no more active references cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 474 * to it, put it in the list of unused memory mappings. cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 475 * cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 476 * During early init (when acpi_permanent_mmap has not been set yet) this cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 477 * routine behaves like acpi_os_unmap_memory(). cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 478 */ cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 479 void __ref acpi_os_unmap_deferred(void *virt, acpi_size size) cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 480 { cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 @481 acpi_os_unref_iomem(virt, size); ad71860a17ba33 Alexey Starikovskiy 2007-02-02 482 } a238317ce81855 Lv Zheng 2014-05-20 483 cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 484 /** cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 485 * acpi_os_release_unused_mappings - Release unused ACPI memory mappings. cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 486 */ cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 487 void acpi_os_release_unused_mappings(void) a238317ce81855 Lv Zheng 2014-05-20 488 { cfc2a23e4be42e Rafael J. Wysocki 2020-06-13 489 __acpi_os_release_unused_mappings(false); a238317ce81855 Lv Zheng 2014-05-20 490 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 491 6f68c91c55ea35 Myron Stowe 2011-11-07 492 int acpi_os_map_generic_address(struct acpi_generic_address *gas) 29718521237a1b Myron Stowe 2010-10-21 493 { bc9ffce27962c0 Myron Stowe 2011-11-07 494 u64 addr; 29718521237a1b Myron Stowe 2010-10-21 495 void __iomem *virt; 29718521237a1b Myron Stowe 2010-10-21 496 bc9ffce27962c0 Myron Stowe 2011-11-07 497 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 29718521237a1b Myron Stowe 2010-10-21 498 return 0; 29718521237a1b Myron Stowe 2010-10-21 499 bc9ffce27962c0 Myron Stowe 2011-11-07 500 /* Handle possible alignment issues */ bc9ffce27962c0 Myron Stowe 2011-11-07 501 memcpy(&addr, &gas->address, sizeof(addr)); bc9ffce27962c0 Myron Stowe 2011-11-07 502 if (!addr || !gas->bit_width) 29718521237a1b Myron Stowe 2010-10-21 503 return -EINVAL; 29718521237a1b Myron Stowe 2010-10-21 504 a238317ce81855 Lv Zheng 2014-05-20 505 virt = acpi_os_map_iomem(addr, gas->bit_width / 8); 29718521237a1b Myron Stowe 2010-10-21 506 if (!virt) 29718521237a1b Myron Stowe 2010-10-21 507 return -EIO; 29718521237a1b Myron Stowe 2010-10-21 508 29718521237a1b Myron Stowe 2010-10-21 509 return 0; 29718521237a1b Myron Stowe 2010-10-21 510 } 6f68c91c55ea35 Myron Stowe 2011-11-07 511 EXPORT_SYMBOL(acpi_os_map_generic_address); 29718521237a1b Myron Stowe 2010-10-21 512 6f68c91c55ea35 Myron Stowe 2011-11-07 513 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas) 29718521237a1b Myron Stowe 2010-10-21 514 { bc9ffce27962c0 Myron Stowe 2011-11-07 515 u64 addr; 7fe135dc058fae Rafael J. Wysocki 2011-02-08 516 struct acpi_ioremap *map; 833a426cc471b6 Francesco Ruggeri 2019-11-19 517 unsigned long refcount; 29718521237a1b Myron Stowe 2010-10-21 518 bc9ffce27962c0 Myron Stowe 2011-11-07 519 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 29718521237a1b Myron Stowe 2010-10-21 520 return; 29718521237a1b Myron Stowe 2010-10-21 521 bc9ffce27962c0 Myron Stowe 2011-11-07 522 /* Handle possible alignment issues */ bc9ffce27962c0 Myron Stowe 2011-11-07 523 memcpy(&addr, &gas->address, sizeof(addr)); bc9ffce27962c0 Myron Stowe 2011-11-07 524 if (!addr || !gas->bit_width) 29718521237a1b Myron Stowe 2010-10-21 525 return; 29718521237a1b Myron Stowe 2010-10-21 526 7bbb890358b96c Rafael J. Wysocki 2011-02-08 527 mutex_lock(&acpi_ioremap_lock); bc9ffce27962c0 Myron Stowe 2011-11-07 528 map = acpi_map_lookup(addr, gas->bit_width / 8); 7fe135dc058fae Rafael J. Wysocki 2011-02-08 529 if (!map) { 7fe135dc058fae Rafael J. Wysocki 2011-02-08 530 mutex_unlock(&acpi_ioremap_lock); 7fe135dc058fae Rafael J. Wysocki 2011-02-08 531 return; 7fe135dc058fae Rafael J. Wysocki 2011-02-08 532 } 833a426cc471b6 Francesco Ruggeri 2019-11-19 @533 refcount = acpi_os_drop_map_ref(map); 7bbb890358b96c Rafael J. Wysocki 2011-02-08 534 mutex_unlock(&acpi_ioremap_lock); 29718521237a1b Myron Stowe 2010-10-21 535 833a426cc471b6 Francesco Ruggeri 2019-11-19 536 if (!refcount) b7c1fadd6c2eea Rafael J. Wysocki 2011-02-08 @537 acpi_os_map_cleanup(map); 29718521237a1b Myron Stowe 2010-10-21 538 } 6f68c91c55ea35 Myron Stowe 2011-11-07 539 EXPORT_SYMBOL(acpi_os_unmap_generic_address); 29718521237a1b Myron Stowe 2010-10-21 540 :::::: The code at line 533 was first introduced by commit :::::: 833a426cc471b6088011b3d67f1dc4e147614647 ACPI: OSL: only free map once in osl.c :::::: TO: Francesco Ruggeri <fruggeri(a)arista.com&gt; :::::: CC: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org