[openeuler:OLK-6.6 3479/3479] include/linux/mmzone.h:1788:2: error: Allocator MAX_ORDER exceeds SECTION_SIZE

5 Dec 2025

      tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   f9a278cf61499e631038cf7d7847bb990cf89d7e
commit: c93eb12529e21dbb59796132f4fdf75fad4eddaf [3479/3479] LoongArch: Adapted SECTION_SIZE_BITS with page size
config: loongarch-randconfig-001-20251205 (https://download.01.org/0day-ci/archive/20251205/202512051233.eoZixxMi-lkp@i...)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project d8b43edf552840e59a22a7f3cc332697bd434782)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251205/202512051233.eoZixxMi-lkp@i...)

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/202512051233.eoZixxMi-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/loongarch/kernel/asm-offsets.c:9:
   In file included from include/linux/mm.h:7:
   In file included from include/linux/gfp.h:7:
...
...
include/linux/mmzone.h:1788:2: error: Allocator MAX_ORDER exceeds SECTION_SIZE
    1788 | #error Allocator MAX_ORDER exceeds SECTION_SIZE
         |  ^
   In file included from arch/loongarch/kernel/asm-offsets.c:9:
   In file included from include/linux/mm.h:1100:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:97:11: warning: array index 3 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
      97 |                 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:9:
   In file included from include/linux/mm.h:1100:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:97:25: warning: array index 2 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
      97 |                 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:9:
   In file included from include/linux/mm.h:1100:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:98:4: warning: array index 1 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
      98 |                         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:9:
   In file included from include/linux/mm.h:1100:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:100:11: warning: array index 1 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
     100 |                 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:9:
   In file included from include/linux/mm.h:1100:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:113:11: warning: array index 3 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
     113 |                 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:9:
   In file included from include/linux/mm.h:1100:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:113:27: warning: array index 3 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
     113 |                 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:9:
   In file included from include/linux/mm.h:1100:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:114:5: warning: array index 2 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
     114 |                         (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:9:
   In file included from include/linux/mm.h:1100:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
vim +1788 include/linux/mmzone.h

d41dee369bff3b Andy Whitcroft     2005-06-23  1783  
835c134ec4dd75 Mel Gorman         2007-10-16  1784  #define SECTION_BLOCKFLAGS_BITS \
d9c2340052278d Mel Gorman         2007-10-16  1785  	((1UL << (PFN_SECTION_SHIFT - pageblock_order)) * NR_PAGEBLOCK_BITS)
835c134ec4dd75 Mel Gorman         2007-10-16  1786  
23baf831a32c04 Kirill A. Shutemov 2023-03-15  1787  #if (MAX_ORDER + PAGE_SHIFT) > SECTION_SIZE_BITS
d41dee369bff3b Andy Whitcroft     2005-06-23 @1788  #error Allocator MAX_ORDER exceeds SECTION_SIZE
d41dee369bff3b Andy Whitcroft     2005-06-23  1789  #endif
d41dee369bff3b Andy Whitcroft     2005-06-23  1790  

:::::: The code at line 1788 was first introduced by commit
:::::: d41dee369bff3b9dcb6328d4d822926c28cc2594 [PATCH] sparsemem memory model

:::::: TO: Andy Whitcroft <apw@shadowen.org>
:::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org>

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