tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 4ebf8d7649cd86c41c41bf48da4b7761da2d5009 commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces date: 4 weeks ago config: x86_64-randconfig-s021-20200718 (attached as .config) compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-49-g707c5017-dirty git checkout 670d0a4b10704667765f7d18f7592993d02783aa # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 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/edac/i10nm_base.c:170:31: sparse: sparse: cast removes address space '__iomem' of expression drivers/edac/i10nm_base.c:171:37: sparse: sparse: cast removes address space '__iomem' of expression vim +/__iomem +149 drivers/edac/i10nm_base.c d4dc89d069aab9 Qiuxu Zhuo 2019-01-30 144 d4dc89d069aab9 Qiuxu Zhuo 2019-01-30 145 static bool i10nm_check_ecc(struct skx_imc *imc, int chan) d4dc89d069aab9 Qiuxu Zhuo 2019-01-30 146 { d4dc89d069aab9 Qiuxu Zhuo 2019-01-30 147 u32 mcmtr; d4dc89d069aab9 Qiuxu Zhuo 2019-01-30 148 d4dc89d069aab9 Qiuxu Zhuo 2019-01-30 @149 mcmtr = *(u32 *)(imc->mbase + 0x20ef8 + chan * 0x4000); d4dc89d069aab9 Qiuxu Zhuo 2019-01-30 150 edac_dbg(1, "ch%d mcmtr reg %x\n", chan, mcmtr); d4dc89d069aab9 Qiuxu Zhuo 2019-01-30 151 d4dc89d069aab9 Qiuxu Zhuo 2019-01-30 152 return !!GET_BITFIELD(mcmtr, 2, 2); d4dc89d069aab9 Qiuxu Zhuo 2019-01-30 153 } d4dc89d069aab9 Qiuxu Zhuo 2019-01-30 154 :::::: The code at line 149 was first introduced by commit :::::: d4dc89d069aab9074e2493a4c2f3969a0a0b91c1 EDAC, i10nm: Add a driver for Intel 10nm server processors :::::: TO: Qiuxu Zhuo <qiuxu.zhuo(a)intel.com&gt; :::::: CC: Borislav Petkov <bp(a)suse.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org