tree: https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.4 head: 629150468791671b5fde21363e643e87c5815b17 commit: 1dea215e98f470c4fabe230cb5dcb648e3301fb9 [19/1697] mtd: rawnand: Add support for ARASAN NAND controller config: i386-randconfig-s001-20210112 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-208-g46a52ca4-dirty # https://github.com/Xilinx/linux-xlnx/commit/1dea215e98f470c4fabe230cb5dcb... git remote add xlnx https://github.com/Xilinx/linux-xlnx git fetch --no-tags xlnx xlnx_rebase_v5.4 git checkout 1dea215e98f470c4fabe230cb5dcb648e3301fb9 # 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/mtd/nand/raw/arasan_nand.c: note: in included file: vim +1294 include/linux/mtd/rawnand.h cbb56fde78b2f261 Naga Sureshkumar Relli 2019-12-05 1287 cbb56fde78b2f261 Naga Sureshkumar Relli 2019-12-05 1288 /* return the supported synchronous timing mode. */ cbb56fde78b2f261 Naga Sureshkumar Relli 2019-12-05 1289 static inline int onfi_get_sync_timing_mode(struct nand_chip *chip) cbb56fde78b2f261 Naga Sureshkumar Relli 2019-12-05 1290 { cbb56fde78b2f261 Naga Sureshkumar Relli 2019-12-05 1291 if (!chip->parameters.onfi) cbb56fde78b2f261 Naga Sureshkumar Relli 2019-12-05 1292 return ONFI_TIMING_MODE_UNKNOWN; cbb56fde78b2f261 Naga Sureshkumar Relli 2019-12-05 1293 cbb56fde78b2f261 Naga Sureshkumar Relli 2019-12-05 @1294 return le16_to_cpu(chip->parameters.onfi->src_sync_timing_mode); cbb56fde78b2f261 Naga Sureshkumar Relli 2019-12-05 1295 } cbb56fde78b2f261 Naga Sureshkumar Relli 2019-12-05 1296 :::::: The code at line 1294 was first introduced by commit :::::: cbb56fde78b2f2617856523a561f10102c622c8f mtd: rawnand: Add sync and async timing mode support :::::: TO: Naga Sureshkumar Relli <naga.sureshkumar.relli(a)xilinx.com&gt; :::::: CC: Michal Simek <michal.simek(a)xilinx.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org