tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f873db9acd3c92d4741bc3676c9eb511b2f9a6f6 commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces date: 9 weeks ago config: riscv-randconfig-s031-20200822 (attached as .config) compiler: riscv64-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: v0.6.2-191-g10164920-dirty git checkout 670d0a4b10704667765f7d18f7592993d02783aa # 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__' ARCH=riscv 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/staging/comedi/drivers/pcmad.c:61:18: sparse: got void * drivers/staging/comedi/drivers/pcmad.c:79:17: sparse: sparse: cast removes address space '__iomem' of expression drivers/staging/comedi/drivers/pcmad.c:79:17: sparse: got void * drivers/staging/comedi/drivers/pcmad.c:85:23: sparse: sparse: cast removes address space '__iomem' of expression drivers/staging/comedi/drivers/pcmad.c:85:23: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ drivers/staging/comedi/drivers/pcmad.c:85:23: sparse: expected void const volatile [noderef] __iomem *addr drivers/staging/comedi/drivers/pcmad.c:85:23: sparse: got void * drivers/staging/comedi/drivers/pcmad.c:86:24: sparse: sparse: cast removes address space '__iomem' of expression drivers/staging/comedi/drivers/pcmad.c:86:24: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ drivers/staging/comedi/drivers/pcmad.c:86:24: sparse: expected void const volatile [noderef] __iomem *addr drivers/staging/comedi/drivers/pcmad.c:86:24: sparse: got void * # 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 670d0a4b10704667765f7d18f7592993d02783aa vim +/__iomem +61 drivers/staging/comedi/drivers/pcmad.c 2a09cba62e82eb H Hartley Sweeten 2013-06-05 53 42946cfc55f5cf H Hartley Sweeten 2014-02-10 54 static int pcmad_ai_eoc(struct comedi_device *dev, 42946cfc55f5cf H Hartley Sweeten 2014-02-10 55 struct comedi_subdevice *s, 42946cfc55f5cf H Hartley Sweeten 2014-02-10 56 struct comedi_insn *insn, 42946cfc55f5cf H Hartley Sweeten 2014-02-10 57 unsigned long context) bcc01b4d852c73 H Hartley Sweeten 2013-06-05 58 { 42946cfc55f5cf H Hartley Sweeten 2014-02-10 59 unsigned int status; bcc01b4d852c73 H Hartley Sweeten 2013-06-05 60 42946cfc55f5cf H Hartley Sweeten 2014-02-10 @61 status = inb(dev->iobase + PCMAD_STATUS); 42946cfc55f5cf H Hartley Sweeten 2014-02-10 62 if ((status & 0x3) == 0x3) bcc01b4d852c73 H Hartley Sweeten 2013-06-05 63 return 0; 42946cfc55f5cf H Hartley Sweeten 2014-02-10 64 return -EBUSY; bcc01b4d852c73 H Hartley Sweeten 2013-06-05 65 } bcc01b4d852c73 H Hartley Sweeten 2013-06-05 66 0a85b6f0ab0d2e Mithlesh Thukral 2009-06-08 67 static int pcmad_ai_insn_read(struct comedi_device *dev, 0a85b6f0ab0d2e Mithlesh Thukral 2009-06-08 68 struct comedi_subdevice *s, 3275b4d3db1f08 H Hartley Sweeten 2013-06-05 69 struct comedi_insn *insn, 3275b4d3db1f08 H Hartley Sweeten 2013-06-05 70 unsigned int *data) 58e732ee57eae8 David Schleef 2009-02-17 71 { 3275b4d3db1f08 H Hartley Sweeten 2013-06-05 72 unsigned int chan = CR_CHAN(insn->chanspec); 7ecc5370de1562 H Hartley Sweeten 2013-06-05 73 unsigned int range = CR_RANGE(insn->chanspec); 3275b4d3db1f08 H Hartley Sweeten 2013-06-05 74 unsigned int val; bcc01b4d852c73 H Hartley Sweeten 2013-06-05 75 int ret; 3275b4d3db1f08 H Hartley Sweeten 2013-06-05 76 int i; 58e732ee57eae8 David Schleef 2009-02-17 77 3275b4d3db1f08 H Hartley Sweeten 2013-06-05 78 for (i = 0; i < insn->n; i++) { 58e732ee57eae8 David Schleef 2009-02-17 @79 outb(chan, dev->iobase + PCMAD_CONVERT); 58e732ee57eae8 David Schleef 2009-02-17 80 42946cfc55f5cf H Hartley Sweeten 2014-02-10 81 ret = comedi_timeout(dev, s, insn, pcmad_ai_eoc, 0); bcc01b4d852c73 H Hartley Sweeten 2013-06-05 82 if (ret) bcc01b4d852c73 H Hartley Sweeten 2013-06-05 83 return ret; bcc01b4d852c73 H Hartley Sweeten 2013-06-05 84 3275b4d3db1f08 H Hartley Sweeten 2013-06-05 85 val = inb(dev->iobase + PCMAD_LSB) | 3275b4d3db1f08 H Hartley Sweeten 2013-06-05 86 (inb(dev->iobase + PCMAD_MSB) << 8); 58e732ee57eae8 David Schleef 2009-02-17 87 3170b2565fb2ef H Hartley Sweeten 2013-06-05 88 /* data is shifted on the pcmad12, fix it */ 3170b2565fb2ef H Hartley Sweeten 2013-06-05 89 if (s->maxdata == 0x0fff) 3170b2565fb2ef H Hartley Sweeten 2013-06-05 90 val >>= 4; 3170b2565fb2ef H Hartley Sweeten 2013-06-05 91 43db70a50737d9 H Hartley Sweeten 2013-08-28 92 if (comedi_range_is_bipolar(s, range)) { 7ecc5370de1562 H Hartley Sweeten 2013-06-05 93 /* munge the two's complement value */ 3275b4d3db1f08 H Hartley Sweeten 2013-06-05 94 val ^= ((s->maxdata + 1) >> 1); 7ecc5370de1562 H Hartley Sweeten 2013-06-05 95 } 3275b4d3db1f08 H Hartley Sweeten 2013-06-05 96 3275b4d3db1f08 H Hartley Sweeten 2013-06-05 97 data[i] = val; 58e732ee57eae8 David Schleef 2009-02-17 98 } 58e732ee57eae8 David Schleef 2009-02-17 99 3275b4d3db1f08 H Hartley Sweeten 2013-06-05 100 return insn->n; 58e732ee57eae8 David Schleef 2009-02-17 101 } 58e732ee57eae8 David Schleef 2009-02-17 102 :::::: The code at line 61 was first introduced by commit :::::: 42946cfc55f5cff22744bf867111be074d1c658a staging: comedi: pcmad: use comedi_timeout() :::::: TO: H Hartley Sweeten <hsweeten(a)visionengravers.com&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org