surface3_button.c:undefined reference to `i2c_del_driver'

[kbuild test robot <fengguang.wu@intel.com>]

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Hi Benjamin,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0c744ea4f77d72b3dcebb7a8f2684633ec79be88
commit: 1a64b719d3ae0e4fb939d9a9e31abb60b4ce4eb1 platform/x86: Introduce button support for the Surface 3
date:   2 weeks ago
config: i386-randconfig-c0-01021248 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout 1a64b719d3ae0e4fb939d9a9e31abb60b4ce4eb1
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `surface3_driver_exit':
>> surface3_button.c:(.exit.text+0x152d): undefined reference to `i2c_del_driver'
   drivers/built-in.o: In function `surface3_driver_init':
>> surface3_button.c:(.init.text+0x1754d): undefined reference to `i2c_register_driver'

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