[josef-btrfs:io-weight 9/9] blk-stat.c:undefined reference to `blk_ioweight_stat_add'

[kbuild test robot]

Hi Josef,

It's probably a bug fix that unveils the link errors.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git 
io-weight
head:   7be3c576c00ecabac39a2a79a6e7b46e2aa7edc6
commit: 7be3c576c00ecabac39a2a79a6e7b46e2aa7edc6 [9/9] change to andy's ml model
config: i386-defconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 7be3c576c00ecabac39a2a79a6e7b46e2aa7edc6
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   block/blk-stat.o: In function `blk_stat_add':
>> blk-stat.c:(.text+0x51f): undefined reference to `blk_ioweight_stat_add'

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