Hi Chen,

[auto build test ERROR on mmotm/master]
[also build test ERROR on v4.9-rc3 next-20161028]
[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/Chen-Feng/mm-cma-improve-utilization-of-cma-pages/20161103-173624
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: x86_64-randconfig-x011-201644 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   In file included from include/linux/slab.h:14:0,
                    from include/linux/crypto.h:24,
                    from arch/x86/kernel/asm-offsets.c:8:
   include/linux/gfp.h: In function 'gfpflags_to_migratetype':
>> include/linux/gfp.h:274:10: error: 'MIGRATE_CMA' undeclared (first use in this function)
      return MIGRATE_CMA;
             ^~~~~~~~~~~
   include/linux/gfp.h:274:10: note: each undeclared identifier is reported only once for each function it appears in
   make[2]: *** [arch/x86/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

vim +/MIGRATE_CMA +274 include/linux/gfp.h

   268	{
   269		VM_WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
   270		BUILD_BUG_ON((1UL << GFP_MOVABLE_SHIFT) != ___GFP_MOVABLE);
   271		BUILD_BUG_ON((___GFP_MOVABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_MOVABLE);
   272	
   273		if (IS_ENABLED(CONFIG_CMA) && gfp_flags & __GFP_MOVABLE)
 > 274			return MIGRATE_CMA;
   275	
   276		if (unlikely(page_group_by_mobility_disabled))
   277			return MIGRATE_UNMOVABLE;

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