Hi Wang,

[auto build test ERROR on btrfs/next]
[also build test ERROR on v4.6-rc1 next-20160330]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Qu-Wenruo/Btrfs-dedupe-framework/20160330-160940
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs.git next
config: i386-randconfig-s1-201613 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

Note: the linux-review/Qu-Wenruo/Btrfs-dedupe-framework/20160330-160940 HEAD a69abdf2c788b7de14a7dc0c237c1df545d13175 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   fs/built-in.o: In function `btrfs_dedupe_enable':
>> (.text+0x366ac1): undefined reference to `btrfs_dedupe_disable'
   fs/built-in.o: In function `btrfs_dedupe_enable':
   (.text+0x366b8b): undefined reference to `__udivdi3'

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