Re: [PATCH v3 2/2] hugetlb: take PMD sharing into account when flushing tlb/caches

[kbuild test robot]

Hi Mike,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.18 next-20180821]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Mike-Kravetz/huge_pmd_unshare-migration-and-flushing/20180822-050255
config: powerpc-defconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
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=7.2.0 make.cross ARCH=powerpc 

All errors (new ones prefixed by >>):

   powerpc64-linux-gnu-ld: warning: orphan section `.gnu.hash' from `linker stubs' being placed in section `.gnu.hash'.
   mm/rmap.o: In function `.try_to_unmap_one':
   rmap.c:(.text+0x2468): undefined reference to `.huge_pmd_sharing_possible'
   mm/hugetlb.o: In function `.__unmap_hugepage_range':
>> (.text+0x6834): undefined reference to `.huge_pmd_sharing_possible'
   mm/hugetlb.o: In function `.unmap_hugepage_range':
   (.text+0x6de8): undefined reference to `.huge_pmd_sharing_possible'
   mm/hugetlb.o: In function `.hugetlb_change_protection':
   (.text+0x91bc): undefined reference to `.huge_pmd_sharing_possible'

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0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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