Hi Pingfan,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.0-rc4]
[cannot apply to next-20190222]
[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/Pingfan-Liu/mm-numa-extract-the-code-of-building-node-fall-back-list/20190225-143613
config: i386-tinyconfig (attached as .config)
compiler: gcc-8 (Debian 8.2.0-20) 8.2.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   ld: mm/memblock.o: in function `memblock_build_node_order':
>> memblock.c:(.init.text+0x310): undefined reference to `build_node_order'

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