tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: bdecf38f228bcca73b31ada98b5b7ba1215eb9c9 commit: b707bb13bbeb3348aba518731fa96d3f4ad335ba [9231/9662] mm/debug: add tests validating architecture page table helpers config: s390-randconfig-s002-20200518 (attached as .config) reproduce: # apt-get install sparse # sparse version: v0.6.1-193-gb8fad4bc-dirty git checkout b707bb13bbeb3348aba518731fa96d3f4ad335ba # save the attached .config to linux build tree make C=1 ARCH=s390 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) vim +/debug_vm_pgtable +1279 arch/s390/include/asm/pgtable.h ^1da177e4c3f415 include/asm-s390/pgtable.h Linus Torvalds 2005-04-16 1278 190a1d722a59725 include/asm-s390/pgtable.h Martin Schwidefsky 2007-10-22 @1279 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) ^1da177e4c3f415 include/asm-s390/pgtable.h Linus Torvalds 2005-04-16 1280 { d1874a0c2805fcf arch/s390/include/asm/pgtable.h Martin Schwidefsky 2019-04-23 1281 if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) >= _REGION_ENTRY_TYPE_R3) d1874a0c2805fcf arch/s390/include/asm/pgtable.h Martin Schwidefsky 2019-04-23 1282 return (pmd_t *) pud_deref(*pud) + pmd_index(address); d1874a0c2805fcf arch/s390/include/asm/pgtable.h Martin Schwidefsky 2019-04-23 1283 return (pmd_t *) pud; d1874a0c2805fcf arch/s390/include/asm/pgtable.h Martin Schwidefsky 2019-04-23 1284 } 1aea9b3f921003f arch/s390/include/asm/pgtable.h Martin Schwidefsky 2017-04-24 1285 :::::: The code at line 1279 was first introduced by commit :::::: 190a1d722a59725706daf832bc8a511ed62f249d [S390] 4level-fixup cleanup :::::: TO: Martin Schwidefsky <schwidefsky(a)de.ibm.com&gt; :::::: CC: Martin Schwidefsky <schwidefsky(a)de.ibm.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org