tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 42eb8fdac2fc5d62392dcfcf0253753e821a97b0 commit: e72fcdb26cde72985c418b39f72ecaa222e1f4d5 powerpc/uaccess: Refactor get/put_user() and __get/put_user() date: 8 months ago config: powerpc64-randconfig-s032-20211118 (attached as .config) compiler: powerpc64-linux-gcc (GCC) 11.2.0 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: v0.6.4-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 e72fcdb26cde72985c418b39f72ecaa222e1f4d5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=powerpc64 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/w1/slaves/w1_ds28e04.c:342:13: sparse: expected char [noderef] __user *_pu_addr drivers/w1/slaves/w1_ds28e04.c:342:13: sparse: got char *buf drivers/w1/slaves/w1_ds28e04.c:356:13: sparse: expected char const [noderef] __user *_gu_addr drivers/w1/slaves/w1_ds28e04.c:356:13: sparse: got char const *buf vim +342 drivers/w1/slaves/w1_ds28e04.c fa33a65a9cf7e2 Greg Kroah-Hartman 2013-08-21 338 fa33a65a9cf7e2 Greg Kroah-Hartman 2013-08-21 339 static ssize_t crccheck_show(struct device *dev, struct device_attribute *attr, fa33a65a9cf7e2 Greg Kroah-Hartman 2013-08-21 340 char *buf) fbf7f7b4e2ae40 Markus Franke 2012-05-26 341 { fbf7f7b4e2ae40 Markus Franke 2012-05-26 @342 if (put_user(w1_enable_crccheck + 0x30, buf)) fbf7f7b4e2ae40 Markus Franke 2012-05-26 343 return -EFAULT; fbf7f7b4e2ae40 Markus Franke 2012-05-26 344 fbf7f7b4e2ae40 Markus Franke 2012-05-26 345 return sizeof(w1_enable_crccheck); fbf7f7b4e2ae40 Markus Franke 2012-05-26 346 } fbf7f7b4e2ae40 Markus Franke 2012-05-26 347 fa33a65a9cf7e2 Greg Kroah-Hartman 2013-08-21 348 static ssize_t crccheck_store(struct device *dev, struct device_attribute *attr, fbf7f7b4e2ae40 Markus Franke 2012-05-26 349 const char *buf, size_t count) fbf7f7b4e2ae40 Markus Franke 2012-05-26 350 { fbf7f7b4e2ae40 Markus Franke 2012-05-26 351 char val; fbf7f7b4e2ae40 Markus Franke 2012-05-26 352 fbf7f7b4e2ae40 Markus Franke 2012-05-26 353 if (count != 1 || !buf) fbf7f7b4e2ae40 Markus Franke 2012-05-26 354 return -EINVAL; fbf7f7b4e2ae40 Markus Franke 2012-05-26 355 fbf7f7b4e2ae40 Markus Franke 2012-05-26 @356 if (get_user(val, buf)) fbf7f7b4e2ae40 Markus Franke 2012-05-26 357 return -EFAULT; fbf7f7b4e2ae40 Markus Franke 2012-05-26 358 fbf7f7b4e2ae40 Markus Franke 2012-05-26 359 /* convert to decimal */ fbf7f7b4e2ae40 Markus Franke 2012-05-26 360 val = val - 0x30; fbf7f7b4e2ae40 Markus Franke 2012-05-26 361 if (val != 0 && val != 1) fbf7f7b4e2ae40 Markus Franke 2012-05-26 362 return -EINVAL; fbf7f7b4e2ae40 Markus Franke 2012-05-26 363 fbf7f7b4e2ae40 Markus Franke 2012-05-26 364 /* set the new value */ fbf7f7b4e2ae40 Markus Franke 2012-05-26 365 w1_enable_crccheck = val; fbf7f7b4e2ae40 Markus Franke 2012-05-26 366 fbf7f7b4e2ae40 Markus Franke 2012-05-26 367 return sizeof(w1_enable_crccheck); fbf7f7b4e2ae40 Markus Franke 2012-05-26 368 } fbf7f7b4e2ae40 Markus Franke 2012-05-26 369 :::::: The code at line 342 was first introduced by commit :::::: fbf7f7b4e2ae40f790828c86d31beff2d49e9ac8 w1: Add 1-wire slave device driver for DS28E04-100 :::::: TO: Markus Franke <franm(a)hrz.tu-chemnitz.de&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