Re: [PATCH v3 11/25] mm: Allow compound zone device pages

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

Hi Alistair,

kernel test robot noticed the following build errors:

[auto build test ERROR on 81983758430957d9a5cb3333fe324fd70cf63e7e]

url:    https://github.com/intel-lab-lkp/linux/commits/Alistair-Popple/fuse-Fix-dax-truncate-punch_hole-fault-path/20241125-094004
base:   81983758430957d9a5cb3333fe324fd70cf63e7e
patch link:    https://lore.kernel.org/r/f1a93b8a38e14e2ab279ece310175334e973b970.1732239628.git-series.apopple%40nvidia.com
patch subject: [PATCH v3 11/25] mm: Allow compound zone device pages
config: powerpc-ebony_defconfig (https://download.01.org/0day-ci/archive/20241125/202411251251.Tjig4oaV-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241125/202411251251.Tjig4oaV-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/202411251251.Tjig4oaV-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/powerpc/kernel/asm-offsets.c:19:
   In file included from include/linux/mman.h:5:
   In file included from include/linux/mm.h:32:
>> include/linux/memremap.h:164:3: error: call to undeclared function 'page_pgmap'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     164 |                 page_pgmap(page)->type == MEMORY_DEVICE_PRIVATE;
         |                 ^
>> include/linux/memremap.h:164:21: error: member reference type 'int' is not a pointer
     164 |                 page_pgmap(page)->type == MEMORY_DEVICE_PRIVATE;
         |                 ~~~~~~~~~~~~~~~~  ^
   include/linux/memremap.h:176:3: error: call to undeclared function 'page_pgmap'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     176 |                 page_pgmap(page)->type == MEMORY_DEVICE_PCI_P2PDMA;
         |                 ^
   include/linux/memremap.h:176:21: error: member reference type 'int' is not a pointer
     176 |                 page_pgmap(page)->type == MEMORY_DEVICE_PCI_P2PDMA;
         |                 ~~~~~~~~~~~~~~~~  ^
   include/linux/memremap.h:182:3: error: call to undeclared function 'page_pgmap'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     182 |                 page_pgmap(page)->type == MEMORY_DEVICE_COHERENT;
         |                 ^
   include/linux/memremap.h:182:21: error: member reference type 'int' is not a pointer
     182 |                 page_pgmap(page)->type == MEMORY_DEVICE_COHERENT;
         |                 ~~~~~~~~~~~~~~~~  ^
   In file included from arch/powerpc/kernel/asm-offsets.c:19:
   In file included from include/linux/mman.h:5:
   In file included from include/linux/mm.h:2213:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from arch/powerpc/kernel/asm-offsets.c:19:
   include/linux/mman.h:157:9: warning: division by zero is undefined [-Wdivision-by-zero]
     157 |                _calc_vm_trans(flags, MAP_LOCKED,     VM_LOCKED    ) |
         |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/mman.h:136:21: note: expanded from macro '_calc_vm_trans'
     136 |    : ((x) & (bit1)) / ((bit1) / (bit2))))
         |                     ^ ~~~~~~~~~~~~~~~~~
   include/linux/mman.h:158:9: warning: division by zero is undefined [-Wdivision-by-zero]
     158 |                _calc_vm_trans(flags, MAP_SYNC,       VM_SYNC      ) |
         |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/mman.h:136:21: note: expanded from macro '_calc_vm_trans'
     136 |    : ((x) & (bit1)) / ((bit1) / (bit2))))
         |                     ^ ~~~~~~~~~~~~~~~~~
   include/linux/mman.h:159:9: warning: division by zero is undefined [-Wdivision-by-zero]
     159 |                _calc_vm_trans(flags, MAP_STACK,      VM_NOHUGEPAGE) |
         |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/mman.h:136:21: note: expanded from macro '_calc_vm_trans'
     136 |    : ((x) & (bit1)) / ((bit1) / (bit2))))
         |                     ^ ~~~~~~~~~~~~~~~~~
   4 warnings and 6 errors generated.
   make[3]: *** [scripts/Makefile.build:102: arch/powerpc/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1203: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:224: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:224: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +/page_pgmap +164 include/linux/memremap.h

   159	
   160	static inline bool is_device_private_page(const struct page *page)
   161	{
   162		return IS_ENABLED(CONFIG_DEVICE_PRIVATE) &&
   163			is_zone_device_page(page) &&
 > 164			page_pgmap(page)->type == MEMORY_DEVICE_PRIVATE;
   165	}
   166	

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