Hi Michal,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.0-rc4 next-20190212]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Michal-Hocko/mm-handle-lru_add_drain_all-for-UP-properly/20190213-063735
config: riscv-tinyconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 8.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=8.2.0 make.cross ARCH=riscv 

All errors (new ones prefixed by >>):

   mm/fadvise.o: In function `.L18':
>> fadvise.c:(.text+0x1e8): undefined reference to `lru_add_drain_all'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation