Re: [PATCH v2 2/5] powerpc/mm: drop powerpc vmemmap_can_optimize()

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

Hi Muchun,

kernel test robot noticed the following build errors:

[auto build test ERROR on dba8aba0a9a00ff781c03d82ae534fc6f8c2e263]

url:    https://github.com/intel-lab-lkp/linux/commits/Muchun-Song/powerpc-mm-make-vmemmap_populate_compound_pages-static/20261105-141213
base:   dba8aba0a9a00ff781c03d82ae534fc6f8c2e263
patch link:    https://lore.kernel.org/r/20261105061217.13302-3-songmuchun%40bytedance.com
patch subject: [PATCH v2 2/5] powerpc/mm: drop powerpc vmemmap_can_optimize()
config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20261105/202611052055.TcIXFI7V-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261105/202611052055.TcIXFI7V-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/202611052055.TcIXFI7V-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/loongarch/kernel/asm-offsets.c:11:
   In file included from include/linux/mm.h:31:
   In file included from include/linux/pgtable.h:6:
   In file included from arch/loongarch/include/asm/pgtable.h:75:
   include/linux/vmemmap-optimization.h:62:9: error: call to undeclared function 'vmemmap_optimizable_order'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      62 |         return vmemmap_optimizable_order(section_compound_order(section));
         |                ^
>> include/linux/vmemmap-optimization.h:68:22: error: use of undeclared identifier 'vmemmap'; did you mean 'mem_map'?
      68 |         unsigned long pfn = page_to_pfn((struct page *)start);
         |                             ^
   include/asm-generic/memory_model.h:73:21: note: expanded from macro 'page_to_pfn'
      73 | #define page_to_pfn __page_to_pfn
         |                     ^
   include/asm-generic/memory_model.h:47:54: note: expanded from macro '__page_to_pfn'
      47 | #define __page_to_pfn(page)     (unsigned long)((page) - vmemmap)
         |                                                          ^
   include/linux/mmzone.h:1452:21: note: 'mem_map' declared here
    1452 | extern struct page *mem_map;
         |                     ^
   In file included from arch/loongarch/kernel/asm-offsets.c:11:
   In file included from include/linux/mm.h:31:
   In file included from include/linux/pgtable.h:6:
   In file included from arch/loongarch/include/asm/pgtable.h:75:
   include/linux/vmemmap-optimization.h:138:20: error: conflicting types for 'vmemmap_optimizable_order'
     138 | static inline bool vmemmap_optimizable_order(unsigned int order)
         |                    ^
   include/linux/vmemmap-optimization.h:62:9: note: previous implicit declaration is here
      62 |         return vmemmap_optimizable_order(section_compound_order(section));
         |                ^
   In file included from arch/loongarch/kernel/asm-offsets.c:11:
   In file included from include/linux/mm.h:36:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:7:
   include/linux/signal.h:98:11: warning: array index 3 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
      98 |                 return (set->sig[3] | set->sig[2] |
         |                         ^        ~
   include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
      62 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/loongarch/kernel/asm-offsets.c:11:
   In file included from include/linux/mm.h:36:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:7:
   include/linux/signal.h:98:25: warning: array index 2 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
      98 |                 return (set->sig[3] | set->sig[2] |
         |                                       ^        ~
   include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
      62 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/loongarch/kernel/asm-offsets.c:11:
   In file included from include/linux/mm.h:36:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:7:
   include/linux/signal.h:99:4: warning: array index 1 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
      99 |                         set->sig[1] | set->sig[0]) == 0;
         |                         ^        ~
   include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
      62 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/loongarch/kernel/asm-offsets.c:11:
   In file included from include/linux/mm.h:36:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:7:
   include/linux/signal.h:101:11: warning: array index 1 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
     101 |                 return (set->sig[1] | set->sig[0]) == 0;
         |                         ^        ~
   include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
      62 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/loongarch/kernel/asm-offsets.c:11:
   In file included from include/linux/mm.h:36:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:7:
   include/linux/signal.h:114:11: warning: array index 3 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
     114 |                 return  (set1->sig[3] == set2->sig[3]) &&
         |                          ^         ~
   include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
      62 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/loongarch/kernel/asm-offsets.c:11:
   In file included from include/linux/mm.h:36:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:7:
   include/linux/signal.h:114:27: warning: array index 3 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
     114 |                 return  (set1->sig[3] == set2->sig[3]) &&
         |                                          ^         ~
   include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
      62 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/loongarch/kernel/asm-offsets.c:11:
   In file included from include/linux/mm.h:36:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:7:
   include/linux/signal.h:115:5: warning: array index 2 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
     115 |                         (set1->sig[2] == set2->sig[2]) &&
         |                          ^         ~
   include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
      62 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/loongarch/kernel/asm-offsets.c:11:
   In file included from include/linux/mm.h:36:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:7:
   include/linux/signal.h:115:21: warning: array index 2 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
     115 |                         (set1->sig[2] == set2->sig[2]) &&
         |                                          ^         ~
   include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
      62 |         unsigned long sig[_NSIG_WORDS];


vim +68 include/linux/vmemmap-optimization.h

    64	
    65	static inline void section_vmemmap_optimization_disable(unsigned long start,
    66			unsigned long end)
    67	{
  > 68		unsigned long pfn = page_to_pfn((struct page *)start);
    69		unsigned long nr_pages = (end - start) / sizeof(struct page);
    70		struct mem_section *section = __pfn_to_section(pfn);
    71	
    72		if (nr_pages < PAGES_PER_SECTION) {
    73			VM_WARN_ON_ONCE(section_vmemmap_optimizable(section));
    74			return;
    75		}
    76	
    77		VM_WARN_ON_ONCE(!IS_ALIGNED(pfn | nr_pages, PAGES_PER_SECTION));
    78		section_set_compound_order(section, 0);
    79	}
    80	

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