tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 449dc8c97089a6e09fb2dac4d92b1b7ac0eb7c1e commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces date: 7 weeks ago config: i386-randconfig-s002-20200809 (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=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 >>) drivers/char/agp/amd-k7-agp.c:46:28: sparse: got unsigned long *real -- drivers/scsi/pcmcia/nsp_cs.c:1669:34: sparse: got void * drivers/scsi/pcmcia/nsp_cs.c: note: in included file: drivers/scsi/pcmcia/nsp_io.h:231:30: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got unsigned long *ptr @@ drivers/scsi/pcmcia/nsp_io.h:231:30: sparse: expected void const volatile [noderef] __iomem *addr drivers/scsi/pcmcia/nsp_io.h:231:30: sparse: got unsigned long *ptr drivers/scsi/pcmcia/nsp_io.h:257:30: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got unsigned long *ptr @@ drivers/scsi/pcmcia/nsp_io.h:257:30: sparse: expected void volatile [noderef] __iomem *addr drivers/scsi/pcmcia/nsp_io.h:257:30: sparse: got unsigned long *ptr vim +46 drivers/char/agp/amd-k7-agp.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 36 ^1da177e4c3f41 Linus Torvalds 2005-04-16 37 static int amd_create_page_map(struct amd_page_map *page_map) ^1da177e4c3f41 Linus Torvalds 2005-04-16 38 { ^1da177e4c3f41 Linus Torvalds 2005-04-16 39 int i; ^1da177e4c3f41 Linus Torvalds 2005-04-16 40 ^1da177e4c3f41 Linus Torvalds 2005-04-16 41 page_map->real = (unsigned long *) __get_free_page(GFP_KERNEL); ^1da177e4c3f41 Linus Torvalds 2005-04-16 42 if (page_map->real == NULL) ^1da177e4c3f41 Linus Torvalds 2005-04-16 43 return -ENOMEM; ^1da177e4c3f41 Linus Torvalds 2005-04-16 44 44a207fc66c13c Dave Airlie 2008-02-20 45 set_memory_uc((unsigned long)page_map->real, 1); fcea424d31868a Arjan van dev Ven 2008-02-06 @46 page_map->remapped = page_map->real; ^1da177e4c3f41 Linus Torvalds 2005-04-16 47 ^1da177e4c3f41 Linus Torvalds 2005-04-16 48 for (i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 49 writel(agp_bridge->scratch_page, page_map->remapped+i); ^1da177e4c3f41 Linus Torvalds 2005-04-16 50 readl(page_map->remapped+i); /* PCI Posting. */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 51 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 52 ^1da177e4c3f41 Linus Torvalds 2005-04-16 53 return 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 54 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 55 :::::: The code at line 46 was first introduced by commit :::::: fcea424d31868a78366ad5ee0cb3cc2a4cbe689b fix historic ioremap() abuse in AGP :::::: TO: Arjan van dev Ven <arjan(a)linux.intel.com&gt; :::::: CC: Dave Airlie <airlied(a)linux.ie&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org