On 02/06/2020 04:40 AM, kbuild test robot wrote: > Hi Anshuman, > > Thank you for the patch! Yet something to improve: > > [auto build test ERROR on powerpc/next] > [also build test ERROR on s390/features linus/master arc/for-next v5.5] > [cannot apply to mmotm/master tip/x86/core arm64/for-next/core next-20200205] > [if your patch is applied to the wrong git tree, please drop us a note to help > improve the system. BTW, we also suggest to use '--base' option to specify the > base tree in git format-patch, please see https://stackoverflow.com/a/37406982] > > url: https://github.com/0day-ci/linux/commits/Anshuman-Khandual/mm-debug-Add-tests-validating-architecture-page-table-helpers/20200205-215507 > base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next > config: ia64-allmodconfig (attached as .config) > compiler: ia64-linux-gcc (GCC) 7.5.0 > reproduce: > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # save the attached .config to linux build tree > GCC_VERSION=7.5.0 make.cross ARCH=ia64 > > If you fix the issue, kindly add following tag > Reported-by: kbuild test robot <lkp@xxxxxxxxx> > > All error/warnings (new ones prefixed by >>): > > In file included from include/asm-generic/pgtable-nopud.h:8:0, > from arch/ia64/include/asm/pgtable.h:586, > from include/linux/mm.h:99, > from include/linux/highmem.h:8, > from mm/debug_vm_pgtable.c:14: > mm/debug_vm_pgtable.c: In function 'pud_clear_tests': >>> include/asm-generic/pgtable-nop4d-hack.h:47:32: error: implicit declaration of function '__pgd'; did you mean '__p4d'? [-Werror=implicit-function-declaration] > #define __pud(x) ((pud_t) { __pgd(x) }) > ^ >>> mm/debug_vm_pgtable.c:141:8: note: in expansion of macro '__pud' > pud = __pud(pud_val(pud) | RANDOM_ORVALUE); > ^~~~~ >>> include/asm-generic/pgtable-nop4d-hack.h:47:22: warning: missing braces around initializer [-Wmissing-braces] > #define __pud(x) ((pud_t) { __pgd(x) }) > ^ >>> mm/debug_vm_pgtable.c:141:8: note: in expansion of macro '__pud' > pud = __pud(pud_val(pud) | RANDOM_ORVALUE); > ^~~~~ > cc1: some warnings being treated as errors This build failure is expected now given that we have allowed DEBUG_VM_PGTABLE with EXPERT without platform requiring ARCH_HAS_DEBUG_VM_PGTABLE. This problem i.e build failure caused without a platform __pgd(), is known to exist both on ia64 and arm (32bit) platforms. Please refer https://lkml.org/lkml/2019/9/24/314 for details where this was discussed earlier. - Anshuman
