Re: [PATCH V13] mm/debug: Add tests validating architecture page table helpers

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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]
> url:
> base: next
> config: ia64-allmodconfig (attached as .config)
> compiler: ia64-linux-gcc (GCC) 7.5.0
> reproduce:
>         wget -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
for details where this was discussed earlier.

- Anshuman

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