[josef-btrfs:blk-iolatency 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
head:   2a5cee452665b4531b9466ad61ea0e55d298ea8e
commit: c7d786e9b482df1830ee7610678657d3ffd0c123 [7/13] memcontrol: schedule throttling if we are congested
config: i386-randconfig-a0-201821 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout c7d786e9b482df1830ee7610678657d3ffd0c123
        # save the attached .config to linux build tree
        make ARCH=i386 

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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