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

[kbuild test robot]

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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.config.gz
Description: application/gzip