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Date:   Wed, 22 Aug 2018 07:07:22 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     kbuild-all@...org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH v3 2/2] hugetlb: take PMD sharing into account when
 flushing tlb/caches

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'

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

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