[josef-btrfs:blk-iolatency-v4 7/13] mm/memcontrol.c:5470: undefined reference to `mem_cgroup_throttle_swaprate'

[kbuild test robot <lkp@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git blk-iolatency-v4
head:   2d27efa1f4e84d52483c459da4c7df5ab36c7b21
commit: 9a7b50c36a45712a7ef0260cd60ed8cf27d61486 [7/13] memcontrol: schedule throttling if we are congested
config: x86_64-randconfig-s2-06120537 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        git checkout 9a7b50c36a45712a7ef0260cd60ed8cf27d61486
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   mm/memcontrol.o: In function `mem_cgroup_try_charge_delay':
>> mm/memcontrol.c:5470: undefined reference to `mem_cgroup_throttle_swaprate'

vim +5470 mm/memcontrol.c

  5460	
  5461	int mem_cgroup_try_charge_delay(struct page *page, struct mm_struct *mm,
  5462				  gfp_t gfp_mask, struct mem_cgroup **memcgp,
  5463				  bool compound)
  5464	{
  5465		struct mem_cgroup *memcg;
  5466		int ret;
  5467	
  5468		ret = mem_cgroup_try_charge(page, mm, gfp_mask, memcgp, compound);
  5469		memcg = *memcgp;
> 5470		mem_cgroup_throttle_swaprate(memcg, page_to_nid(page), gfp_mask);
  5471		return ret;
  5472	}
  5473	

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