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Date:   Wed, 22 Aug 2018 06:03:29 +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>, stable@...r.kernel.org
Subject: Re: [PATCH v3 1/2] mm: migration: fix migration of huge PMD shared
 pages

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: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   arch/x86/mm/fault.o: In function `huge_pmd_sharing_possible':
>> fault.c:(.text+0xa06): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   arch/x86/mm/pgtable.o: In function `huge_pmd_sharing_possible':
   pgtable.c:(.text+0x4): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/fork.o: In function `huge_pmd_sharing_possible':
   fork.c:(.text+0x309): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/sysctl.o: In function `huge_pmd_sharing_possible':
   sysctl.c:(.text+0x0): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/sched/core.o: In function `huge_pmd_sharing_possible':
   core.c:(.text+0x299): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/sched/loadavg.o: In function `huge_pmd_sharing_possible':
   loadavg.c:(.text+0x0): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/sched/clock.o: In function `huge_pmd_sharing_possible':
   clock.c:(.text+0x0): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/sched/cputime.o: In function `huge_pmd_sharing_possible':
   cputime.c:(.text+0x0): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/sched/idle.o: In function `huge_pmd_sharing_possible':
   idle.c:(.text+0x36): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/sched/fair.o: In function `huge_pmd_sharing_possible':
   fair.c:(.text+0x864): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/sched/rt.o: In function `huge_pmd_sharing_possible':
   rt.c:(.text+0x72b): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/sched/deadline.o: In function `huge_pmd_sharing_possible':
   deadline.c:(.text+0xac7): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/sched/wait.o: In function `huge_pmd_sharing_possible':
   wait.c:(.text+0x16e): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/sched/wait_bit.o: In function `huge_pmd_sharing_possible':
   wait_bit.c:(.text+0x7b): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/sched/swait.o: In function `huge_pmd_sharing_possible':
   swait.c:(.text+0x4): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   kernel/sched/completion.o: In function `huge_pmd_sharing_possible':
   completion.c:(.text+0x4): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/filemap.o: In function `huge_pmd_sharing_possible':
   filemap.c:(.text+0x3ca): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/page_alloc.o: In function `huge_pmd_sharing_possible':
   page_alloc.c:(.text+0xa95): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/swap.o: In function `huge_pmd_sharing_possible':
   swap.c:(.text+0x551): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/vmscan.o: In function `huge_pmd_sharing_possible':
   vmscan.c:(.text+0x5bb): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/shmem.o: In function `huge_pmd_sharing_possible':
   shmem.c:(.text+0x6d): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/util.o: In function `huge_pmd_sharing_possible':
   util.c:(.text+0xc): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/compaction.o: In function `huge_pmd_sharing_possible':
   compaction.c:(.text+0x0): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/debug.o: In function `huge_pmd_sharing_possible':
   debug.c:(.text+0x0): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/gup.o: In function `huge_pmd_sharing_possible':
   gup.c:(.text+0x17c): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/memory.o: In function `huge_pmd_sharing_possible':
   memory.c:(.text+0x5f9): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/mincore.o: In function `huge_pmd_sharing_possible':
   mincore.c:(.text+0x150): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/mlock.o: In function `huge_pmd_sharing_possible':
   mlock.c:(.text+0x245): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/mmap.o: In function `huge_pmd_sharing_possible':
   mmap.c:(.text+0x565): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/mprotect.o: In function `huge_pmd_sharing_possible':
   mprotect.c:(.text+0x39): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/mremap.o: In function `huge_pmd_sharing_possible':
   mremap.c:(.text+0xf2): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/page_vma_mapped.o: In function `huge_pmd_sharing_possible':
   page_vma_mapped.c:(.text+0x0): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/pagewalk.o: In function `huge_pmd_sharing_possible':
   pagewalk.c:(.text+0x13d): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here
   mm/rmap.o: In function `huge_pmd_sharing_possible':
   rmap.c:(.text+0x3bb): multiple definition of `huge_pmd_sharing_possible'
   arch/x86/mm/init_32.o:init_32.c:(.text+0x0): first defined here

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