tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 06a4ec1d9dc652e17ee3ac2ceb6c7cf6c2b75cdd commit: 005b73d0dd83c9cb9420a196bea8070cde30ecac m68knommu: __force type casts for raw IO access date: 3 weeks ago config: m68k-randconfig-s031-20200818 (attached as .config) compiler: m68k-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: v0.6.2-180-g49f7e13a-dirty git checkout 005b73d0dd83c9cb9420a196bea8070cde30ecac # 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=m68k 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/usb/isp1760/isp1760-udc.c:212:24: sparse: sparse: cast to restricted __le32 drivers/usb/isp1760/isp1760-udc.c:212:24: sparse: sparse: cast to restricted __le32 drivers/usb/isp1760/isp1760-udc.c:212:24: sparse: sparse: cast to restricted __le32 drivers/usb/isp1760/isp1760-udc.c:212:24: sparse: sparse: cast to restricted __le32 drivers/usb/isp1760/isp1760-udc.c:212:24: sparse: sparse: cast to restricted __le32 drivers/usb/isp1760/isp1760-udc.c:212:24: sparse: sparse: cast to restricted __le32 drivers/usb/isp1760/isp1760-udc.c:214:31: sparse: sparse: cast to restricted __le16 drivers/usb/isp1760/isp1760-udc.c:214:31: sparse: sparse: cast to restricted __le16 drivers/usb/isp1760/isp1760-udc.c:214:31: sparse: sparse: cast to restricted __le16 drivers/usb/isp1760/isp1760-udc.c:214:31: sparse: sparse: cast to restricted __le16 drivers/usb/isp1760/isp1760-udc.c:268:53: sparse: sparse: incorrect type in argument 3 (different base types) @@ expected unsigned int [usertype] val @@ got restricted __le32 [usertype] @@ drivers/usb/isp1760/isp1760-udc.c:268:53: sparse: expected unsigned int [usertype] val drivers/usb/isp1760/isp1760-udc.c:268:53: sparse: got restricted __le32 [usertype] drivers/usb/isp1760/isp1760-udc.c:270:17: sparse: got restricted __le16 [usertype] drivers/usb/isp1760/isp1760-udc.c:485:9: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned short volatile [usertype] @@ got restricted __le16 [usertype] @@ drivers/usb/isp1760/isp1760-udc.c:485:9: sparse: expected unsigned short volatile [usertype] drivers/usb/isp1760/isp1760-udc.c:485:9: sparse: got restricted __le16 [usertype] # 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 005b73d0dd83c9cb9420a196bea8070cde30ecac vim +270 drivers/usb/isp1760/isp1760-udc.c 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 241 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 242 static void isp1760_udc_transmit(struct isp1760_ep *ep, 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 243 struct isp1760_request *req) 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 244 { 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 245 struct isp1760_udc *udc = ep->udc; 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 246 u32 *buf = req->req.buf + req->req.actual; 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 247 int i; 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 248 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 249 req->packet_size = min(req->req.length - req->req.actual, 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 250 ep->maxpacket); 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 251 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 252 dev_dbg(udc->isp->dev, "%s: transferring %u bytes (%u/%u done)\n", 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 253 __func__, req->packet_size, req->req.actual, 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 254 req->req.length); 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 255 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 256 __isp1760_udc_select_ep(ep, USB_DIR_IN); 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 257 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 258 if (req->packet_size) 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 259 isp1760_udc_write(udc, DC_BUFLEN, req->packet_size); 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 260 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 261 /* 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 262 * Make sure not to write more than one extra byte, otherwise extra data 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 263 * will stay in the FIFO and will be transmitted during the next control 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 264 * request. The endpoint control CLBUF bit is supposed to allow flushing 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 265 * the FIFO for this kind of conditions, but doesn't seem to work. 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 266 */ 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 267 for (i = req->packet_size; i > 2; i -= 4, ++buf) 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 268 isp1760_udc_write(udc, DC_DATAPORT, cpu_to_le32(*buf)); 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 269 if (i > 0) 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 @270 writew(cpu_to_le16(*(u16 *)buf), udc->regs + DC_DATAPORT); 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 271 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 272 if (ep->addr == 0) 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 273 isp1760_udc_write(udc, DC_CTRLFUNC, DC_DSEN); 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 274 if (!req->packet_size) 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 275 isp1760_udc_write(udc, DC_CTRLFUNC, DC_VENDP); 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 276 } 0316ca6319b98e4 drivers/usb/host/isp1760-udc.c Laurent Pinchart 2015-01-21 277 :::::: The code at line 270 was first introduced by commit :::::: 0316ca6319b98e485325be98a47d08fed07ead43 usb: isp1760: Add device controller support :::::: TO: Laurent Pinchart <laurent.pinchart(a)ideasonboard.com&gt; :::::: CC: Felipe Balbi <balbi(a)ti.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org