Re: [PATCH v1 1/2] mm/huge_memory: introduce uniform_split_unmapped_folio_to_zero_order

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

Hi Jiaqi,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.18-rc5]
[cannot apply to akpm-mm/mm-everything next-20251114]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Jiaqi-Yan/mm-huge_memory-introduce-uniform_split_unmapped_folio_to_zero_order/20251116-094846
base:   linus/master
patch link:    https://lore.kernel.org/r/20251116014721.1561456-2-jiaqiyan%40google.com
patch subject: [PATCH v1 1/2] mm/huge_memory: introduce uniform_split_unmapped_folio_to_zero_order
config: arc-randconfig-001-20251117 (https://download.01.org/0day-ci/archive/20251117/202511170614.JnCyqo45-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 14.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251117/202511170614.JnCyqo45-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/202511170614.JnCyqo45-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/mm.h:6,
                    from arch/arc/kernel/asm-offsets.c:8:
   include/linux/huge_mm.h: In function 'uniform_split_unmapped_folio_to_zero_order':
>> include/linux/huge_mm.h:575:33: error: 'page' undeclared (first use in this function)
     575 |         VM_WARN_ON_ONCE_PAGE(1, page);
         |                                 ^~~~
   include/linux/mmdebug.h:55:27: note: in definition of macro 'VM_WARN_ON_ONCE_PAGE'
      55 |                 dump_page(page, "VM_WARN_ON_ONCE_PAGE(" __stringify(cond)")");\
         |                           ^~~~
   include/linux/huge_mm.h:575:33: note: each undeclared identifier is reported only once for each function it appears in
     575 |         VM_WARN_ON_ONCE_PAGE(1, page);
         |                                 ^~~~
   include/linux/mmdebug.h:55:27: note: in definition of macro 'VM_WARN_ON_ONCE_PAGE'
      55 |                 dump_page(page, "VM_WARN_ON_ONCE_PAGE(" __stringify(cond)")");\
         |                           ^~~~
   make[3]: *** [scripts/Makefile.build:182: arch/arc/kernel/asm-offsets.s] Error 1 shuffle=3849756084
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1280: prepare0] Error 2 shuffle=3849756084
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:248: __sub-make] Error 2 shuffle=3849756084
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2 shuffle=3849756084
   make: Target 'prepare' not remade because of errors.


vim +/page +575 include/linux/huge_mm.h

   567	
   568	static inline bool
   569	can_split_folio(struct folio *folio, int caller_pins, int *pextra_pins)
   570	{
   571		return false;
   572	}
   573	static inline int uniform_split_unmapped_folio_to_zero_order(struct folio *folio)
   574	{
 > 575		VM_WARN_ON_ONCE_PAGE(1, page);
   576		return -EINVAL;
   577	}
   578	static inline int
   579	split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
   580			unsigned int new_order)
   581	{
   582		VM_WARN_ON_ONCE_PAGE(1, page);
   583		return -EINVAL;
   584	}
   585	static inline int split_huge_page(struct page *page)
   586	{
   587		VM_WARN_ON_ONCE_PAGE(1, page);
   588		return -EINVAL;
   589	}
   590	

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