Hi Nitin,

I love your patch! Yet something to improve:

[auto build test ERROR on mmotm/master]
[also build test ERROR on v5.4-rc7 next-20191115]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Nitin-Gupta/mm-Proactive-compaction/20191116-062531
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: parisc-c3000_defconfig (attached as .config)
compiler: hppa-linux-gcc (GCC) 7.4.0
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=7.4.0 make.cross ARCH=parisc 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All error/warnings (new ones prefixed by >>):

   mm/compaction.c: In function 'extfrag_hpage_wmark':
>> mm/compaction.c:1860:33: error: 'HUGETLB_PAGE_ORDER' undeclared (first use in this function); did you mean 'HPAGE_PMD_ORDER'?
     return extfrag_for_order(zone, HUGETLB_PAGE_ORDER) > wmark;
                                    ^~~~~~~~~~~~~~~~~~
                                    HPAGE_PMD_ORDER
   mm/compaction.c:1860:33: note: each undeclared identifier is reported only once for each function it appears in
   mm/compaction.c: In function 'node_hpage_should_compact':
   mm/compaction.c:1869:30: error: 'HUGETLB_PAGE_ORDER' undeclared (first use in this function); did you mean 'HPAGE_PMD_ORDER'?
       compaction_suitable(zone, HUGETLB_PAGE_ORDER,
                                 ^~~~~~~~~~~~~~~~~~
                                 HPAGE_PMD_ORDER
   mm/compaction.c: In function 'extfrag_hpage_wmark':
>> mm/compaction.c:1861:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^

vim +1860 mm/compaction.c

  1851	
  1852	static unsigned int extfrag_hpage_wmark(struct zone *zone, bool low)
  1853	{
  1854		int node_id, wmark, wmark_low;
  1855	
  1856		node_id = zone->zone_pgdat->node_id;
  1857		wmark_low = 100 - compaction_states[node_id].hpage_compaction_effort;
  1858		wmark = low ? wmark_low : min(wmark_low + 10, 100);
  1859	
> 1860		return extfrag_for_order(zone, HUGETLB_PAGE_ORDER) > wmark;
> 1861	}
  1862	

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