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: sh-titan_defconfig (attached as .config)
compiler: sh4-linux-gnu-gcc (Debian 8.2.0-11) 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=sh 

All errors (new ones prefixed by >>):

   sh4-linux-gnu-ld: mm/fadvise.o: in function `vfs_fadvise':
   fadvise.c:(.text+0x270): undefined reference to `lru_add_drain_all'
   sh4-linux-gnu-ld: mm/compaction.o: in function `sysctl_compaction_handler':
>> compaction.c:(.text+0x1d8c): undefined reference to `lru_add_drain_all'
   sh4-linux-gnu-ld: mm/migrate.o: in function `migrate_prep':
>> migrate.c:(.text+0xee4): undefined reference to `lru_add_drain_all'
   sh4-linux-gnu-ld: mm/memfd.o: in function `memfd_fcntl':
>> memfd.c:(.text+0x2fc): undefined reference to `lru_add_drain_all'
   sh4-linux-gnu-ld: fs/block_dev.o: in function `invalidate_bdev':
>> block_dev.c:(.text+0x274): undefined reference to `lru_add_drain_all'

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