tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 614124bea77e452aa6df7a8714e8bc820b489922 commit: 894fa235eb4ca0bfa692dbe4932c2f940cdc8c1e powerpc: inline iomap accessors date: 6 months ago config: powerpc-randconfig-s032-20210608 (attached as .config) compiler: powerpc-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 894fa235eb4ca0bfa692dbe4932c2f940cdc8c1e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=powerpc 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/powerpc/platforms/44x/ppc476.c:236:17: sparse: sparse: cast removes address space '__iomem' of expression arch/powerpc/platforms/44x/ppc476.c:241:34: sparse: expected void const volatile [noderef] __iomem *addr arch/powerpc/platforms/44x/ppc476.c:241:34: sparse: got unsigned char [usertype] * arch/powerpc/platforms/44x/ppc476.c:243:17: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got unsigned char [usertype] *[assigned] fpga @@ arch/powerpc/platforms/44x/ppc476.c:243:17: sparse: expected void volatile [noderef] __iomem *addr arch/powerpc/platforms/44x/ppc476.c:243:17: sparse: got unsigned char [usertype] *[assigned] fpga vim +241 arch/powerpc/platforms/44x/ppc476.c 228d55053397e6 arch/powerpc/platforms/44x/currituck.c Tony Breeds 2011-11-30 217 ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 218 static int board_rev = -1; ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 219 static int __init ppc47x_get_board_rev(void) ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 220 { 2a2c74b2efcb1a arch/powerpc/platforms/44x/ppc476.c Alistair Popple 2014-03-06 221 int reg; 2a2c74b2efcb1a arch/powerpc/platforms/44x/ppc476.c Alistair Popple 2014-03-06 222 u8 *fpga; 2a2c74b2efcb1a arch/powerpc/platforms/44x/ppc476.c Alistair Popple 2014-03-06 223 struct device_node *np = NULL; ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 224 2a2c74b2efcb1a arch/powerpc/platforms/44x/ppc476.c Alistair Popple 2014-03-06 225 if (of_machine_is_compatible("ibm,currituck")) { ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 226 np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga"); 2a2c74b2efcb1a arch/powerpc/platforms/44x/ppc476.c Alistair Popple 2014-03-06 227 reg = 0; 2a2c74b2efcb1a arch/powerpc/platforms/44x/ppc476.c Alistair Popple 2014-03-06 228 } else if (of_machine_is_compatible("ibm,akebono")) { 2a2c74b2efcb1a arch/powerpc/platforms/44x/ppc476.c Alistair Popple 2014-03-06 229 np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga"); 2a2c74b2efcb1a arch/powerpc/platforms/44x/ppc476.c Alistair Popple 2014-03-06 230 reg = 2; 2a2c74b2efcb1a arch/powerpc/platforms/44x/ppc476.c Alistair Popple 2014-03-06 231 } 2a2c74b2efcb1a arch/powerpc/platforms/44x/ppc476.c Alistair Popple 2014-03-06 232 ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 233 if (!np) ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 234 goto fail; ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 235 2a2c74b2efcb1a arch/powerpc/platforms/44x/ppc476.c Alistair Popple 2014-03-06 236 fpga = (u8 *) of_iomap(np, 0); ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 237 of_node_put(np); ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 238 if (!fpga) ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 239 goto fail; ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 240 2a2c74b2efcb1a arch/powerpc/platforms/44x/ppc476.c Alistair Popple 2014-03-06 @241 board_rev = ioread8(fpga + reg) & 0x03; ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 242 pr_info("%s: Found board revision %d\n", __func__, board_rev); ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 243 iounmap(fpga); ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 244 return 0; ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 245 ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 246 fail: ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 247 pr_info("%s: Unable to find board revision\n", __func__); ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 248 return 0; ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 249 } ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 250 machine_arch_initcall(ppc47x, ppc47x_get_board_rev); ab9a4183fddf23 arch/powerpc/platforms/44x/currituck.c Alistair Popple 2013-05-09 251 :::::: The code at line 241 was first introduced by commit :::::: 2a2c74b2efcb1a0ca3fdcb5fbb96ad8de6a29177 IBM Akebono: Add the Akebono platform :::::: TO: Alistair Popple <alistair(a)popple.id.au&gt; :::::: CC: Benjamin Herrenschmidt <benh(a)kernel.crashing.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org