Re: [RFC PATCH 4/4] mm: adjust free_pages to make __zone_watermark_ok() mTHP-aware

[kernel test robot <lkp@intel.com>]

Hi Bo,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Bo-Zhang/mm-compaction-make-proactive-compaction-mTHP-aware/20260825-123830
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20260825043833.2659350-5-zhangbo56%40xiaomi.com
patch subject: [RFC PATCH 4/4] mm: adjust free_pages to make __zone_watermark_ok() mTHP-aware
config: m68k-allmodconfig (https://download.01.org/0day-ci/archive/20260831/202608310029.Jjv3T2aV-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260831/202608310029.Jjv3T2aV-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608310029.Jjv3T2aV-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   mm/compaction.c: In function 'compact_hpage_order':
>> mm/compaction.c:87:42: error: 'huge_anon_orders_always' undeclared (first use in this function)
      87 |         unsigned long orders = READ_ONCE(huge_anon_orders_always);
         |                                          ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:682:23: note: in definition of macro '__compiletime_assert'
     682 |                 if (!(condition))                                       \
         |                       ^~~~~~~~~
   include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
     702 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long),  \
         |         ^~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long),  \
         |                            ^~~~~~~~~~~~~
   include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
      49 |         compiletime_assert_rwonce_type(x);                              \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   mm/compaction.c:87:32: note: in expansion of macro 'READ_ONCE'
      87 |         unsigned long orders = READ_ONCE(huge_anon_orders_always);
         |                                ^~~~~~~~~
   mm/compaction.c:87:42: note: each undeclared identifier is reported only once for each function it appears in
   include/linux/compiler_types.h:682:23: note: in definition of macro '__compiletime_assert'
     682 |                 if (!(condition))                                       \
         |                       ^~~~~~~~~
   include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
     702 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long),  \
         |         ^~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
      36 |         compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long),  \
         |                            ^~~~~~~~~~~~~
   include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
      49 |         compiletime_assert_rwonce_type(x);                              \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   mm/compaction.c:87:32: note: in expansion of macro 'READ_ONCE'
      87 |         unsigned long orders = READ_ONCE(huge_anon_orders_always);
         |                                ^~~~~~~~~


vim +/huge_anon_orders_always +87 mm/compaction.c

    84	
    85	static inline int compact_hpage_order(void)
    86	{
  > 87		unsigned long orders = READ_ONCE(huge_anon_orders_always);
    88	
    89		if (orders)
    90			return __ffs(orders);
    91		return COMPACTION_HPAGE_ORDER;
    92	}
    93	

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