[openeuler:openEuler-1.0-LTS 1755/1755] include/linux/mempolicy.h:329:13: warning: '__do_mbind' defined but not used

26 Oct 2025

      Hi Zhang,

FYI, the error/warning still remains.

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   ee55f6a88c1f70120d9cec8244c5cd10f0c4dce9
commit: 1811840c2cdebd0820818392a8217ffbd1be5c67 [1755/1755] mm/sharepool: Fix sharepool node id invalid when using sp_alloc
config: arm64-allnoconfig (https://download.01.org/0day-ci/archive/20251026/202510261133.NBo7iUqV-lkp@i...)
compiler: aarch64-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251026/202510261133.NBo7iUqV-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/202510261133.NBo7iUqV-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/shmem_fs.h:7,
                    from mm/filemap.c:37:
...
...
include/linux/mempolicy.h:329:13: warning: '__do_mbind' defined but not used [-Wunused-function]
     329 | static long __do_mbind(unsigned long start, unsigned long len,
         |             ^~~~~~~~~~
--
   In file included from mm/oom_kill.c:35:
include/linux/mempolicy.h:329:13: warning: '__do_mbind' defined but not used [-Wunused-function]
     329 | static long __do_mbind(unsigned long start, unsigned long len,
         |             ^~~~~~~~~~
   In file included from arch/arm64/include/asm/atomic.h:36,
                    from include/linux/atomic.h:7,
                    from include/asm-generic/bitops/atomic.h:5,
                    from arch/arm64/include/asm/bitops.h:37,
                    from include/linux/bitops.h:19,
                    from include/linux/kernel.h:11,
                    from include/linux/list.h:9,
                    from include/linux/rculist.h:10,
                    from include/linux/sched/signal.h:6,
                    from include/linux/oom.h:6,
                    from mm/oom_kill.c:20:
   In function '__cmpxchg_case_acq_4',
       inlined from '__cmpxchg_acq' at arch/arm64/include/asm/cmpxchg.h:141:1,
       inlined from 'queued_spin_lock' at include/asm-generic/qspinlock.h:85:8,
       inlined from 'do_raw_spin_lock' at include/linux/spinlock.h:180:2,
       inlined from '__raw_spin_lock' at include/linux/spinlock_api_smp.h:143:2,
       inlined from 'spin_lock' at include/linux/spinlock.h:329:2,
       inlined from 'wake_oom_reaper' at mm/oom_kill.c:738:2,
       inlined from 'wake_oom_reaper' at mm/oom_kill.c:730:13:
   arch/arm64/include/asm/atomic_ll_sc.h:259:9: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'spinlock_t[1]' {aka 'struct spinlock[1]'} [-Warray-bounds=]
     259 |         asm volatile(                                                   \
         |         ^~~
   arch/arm64/include/asm/atomic_ll_sc.h:283:1: note: in expansion of macro '__CMPXCHG_CASE'
     283 | __CMPXCHG_CASE(w,  , acq_4,        , a,  , "memory")
         | ^~~~~~~~~~~~~~
   In file included from include/linux/spinlock.h:82,
                    from include/linux/ipc.h:5,
                    from include/uapi/linux/sem.h:5,
                    from include/linux/sem.h:5,
                    from include/linux/sched.h:15,
                    from include/linux/sched/signal.h:8:
   mm/oom_kill.c: In function 'wake_oom_reaper':
   mm/oom_kill.c:584:24: note: object 'oom_reaper_lock' of size 4
     584 | static DEFINE_SPINLOCK(oom_reaper_lock);
         |                        ^~~~~~~~~~~~~~~
   include/linux/spinlock_types.h:81:44: note: in definition of macro 'DEFINE_SPINLOCK'
      81 | #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
         |                                            ^
   In function '__cmpxchg_case_acq_4',
       inlined from '__cmpxchg_acq' at arch/arm64/include/asm/cmpxchg.h:141:1,
       inlined from 'queued_spin_lock' at include/asm-generic/qspinlock.h:85:8,
       inlined from 'do_raw_spin_lock' at include/linux/spinlock.h:180:2,
       inlined from '__raw_spin_lock' at include/linux/spinlock_api_smp.h:143:2,
       inlined from 'spin_lock' at include/linux/spinlock.h:329:2,
       inlined from 'wake_oom_reaper' at mm/oom_kill.c:738:2,
       inlined from 'wake_oom_reaper' at mm/oom_kill.c:730:13:
   arch/arm64/include/asm/atomic_ll_sc.h:259:9: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'spinlock_t[1]' {aka 'struct spinlock[1]'} [-Warray-bounds=]
     259 |         asm volatile(                                                   \
         |         ^~~
   arch/arm64/include/asm/atomic_ll_sc.h:283:1: note: in expansion of macro '__CMPXCHG_CASE'
     283 | __CMPXCHG_CASE(w,  , acq_4,        , a,  , "memory")
         | ^~~~~~~~~~~~~~
   mm/oom_kill.c: In function 'wake_oom_reaper':
   mm/oom_kill.c:584:24: note: object 'oom_reaper_lock' of size 4
     584 | static DEFINE_SPINLOCK(oom_reaper_lock);
         |                        ^~~~~~~~~~~~~~~
   include/linux/spinlock_types.h:81:44: note: in definition of macro 'DEFINE_SPINLOCK'
      81 | #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
         |                                            ^
   In function '__cmpxchg_case_acq_4',
       inlined from '__cmpxchg_acq' at arch/arm64/include/asm/cmpxchg.h:141:1,
       inlined from 'queued_spin_lock' at include/asm-generic/qspinlock.h:85:8,
       inlined from 'do_raw_spin_lock' at include/linux/spinlock.h:180:2,
       inlined from '__raw_spin_lock' at include/linux/spinlock_api_smp.h:143:2,
       inlined from 'spin_lock' at include/linux/spinlock.h:329:2,
       inlined from 'oom_reaper' at mm/oom_kill.c:716:3:
   arch/arm64/include/asm/atomic_ll_sc.h:259:9: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'spinlock_t[1]' {aka 'struct spinlock[1]'} [-Warray-bounds=]
     259 |         asm volatile(                                                   \
         |         ^~~
   arch/arm64/include/asm/atomic_ll_sc.h:283:1: note: in expansion of macro '__CMPXCHG_CASE'
     283 | __CMPXCHG_CASE(w,  , acq_4,        , a,  , "memory")
         | ^~~~~~~~~~~~~~
   mm/oom_kill.c: In function 'oom_reaper':
   mm/oom_kill.c:584:24: note: object 'oom_reaper_lock' of size 4
     584 | static DEFINE_SPINLOCK(oom_reaper_lock);
         |                        ^~~~~~~~~~~~~~~
   include/linux/spinlock_types.h:81:44: note: in definition of macro 'DEFINE_SPINLOCK'
      81 | #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
         |                                            ^
   In function '__cmpxchg_case_acq_4',
       inlined from '__cmpxchg_acq' at arch/arm64/include/asm/cmpxchg.h:141:1,
       inlined from 'queued_spin_lock' at include/asm-generic/qspinlock.h:85:8,
       inlined from 'do_raw_spin_lock' at include/linux/spinlock.h:180:2,
       inlined from '__raw_spin_lock' at include/linux/spinlock_api_smp.h:143:2,
       inlined from 'spin_lock' at include/linux/spinlock.h:329:2,
       inlined from 'oom_reaper' at mm/oom_kill.c:716:3:
   arch/arm64/include/asm/atomic_ll_sc.h:259:9: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'spinlock_t[1]' {aka 'struct spinlock[1]'} [-Warray-bounds=]
     259 |         asm volatile(                                                   \
         |         ^~~
   arch/arm64/include/asm/atomic_ll_sc.h:283:1: note: in expansion of macro '__CMPXCHG_CASE'
     283 | __CMPXCHG_CASE(w,  , acq_4,        , a,  , "memory")
         | ^~~~~~~~~~~~~~
   mm/oom_kill.c: In function 'oom_reaper':
   mm/oom_kill.c:584:24: note: object 'oom_reaper_lock' of size 4
     584 | static DEFINE_SPINLOCK(oom_reaper_lock);
         |                        ^~~~~~~~~~~~~~~
   include/linux/spinlock_types.h:81:44: note: in definition of macro 'DEFINE_SPINLOCK'
      81 | #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
--
    7495 |         adj_init_size(__init_begin, __init_end, init_data_size,
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:27: warning: comparison between two arrays [-Warray-compare]
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                           ^~
   mm/page_alloc.c:7497:9: note: in expansion of macro 'adj_init_size'
    7497 |         adj_init_size(_stext, _etext, codesize, _sinittext, init_code_size);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:27: note: use '&_stext[0] <= &_sinittext[0]' to compare the addresses
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                           ^~
   mm/page_alloc.c:7497:9: note: in expansion of macro 'adj_init_size'
    7497 |         adj_init_size(_stext, _etext, codesize, _sinittext, init_code_size);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:41: warning: comparison between two arrays [-Warray-compare]
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                                         ^
   mm/page_alloc.c:7497:9: note: in expansion of macro 'adj_init_size'
    7497 |         adj_init_size(_stext, _etext, codesize, _sinittext, init_code_size);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:41: note: use '&_sinittext[0] < &_etext[0]' to compare the addresses
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                                         ^
   mm/page_alloc.c:7497:9: note: in expansion of macro 'adj_init_size'
    7497 |         adj_init_size(_stext, _etext, codesize, _sinittext, init_code_size);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:27: warning: comparison between two arrays [-Warray-compare]
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                           ^~
   mm/page_alloc.c:7498:9: note: in expansion of macro 'adj_init_size'
    7498 |         adj_init_size(_sdata, _edata, datasize, __init_begin, init_data_size);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:27: note: use '&_sdata[0] <= &__init_begin[0]' to compare the addresses
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                           ^~
   mm/page_alloc.c:7498:9: note: in expansion of macro 'adj_init_size'
    7498 |         adj_init_size(_sdata, _edata, datasize, __init_begin, init_data_size);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:41: warning: comparison between two arrays [-Warray-compare]
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                                         ^
   mm/page_alloc.c:7498:9: note: in expansion of macro 'adj_init_size'
    7498 |         adj_init_size(_sdata, _edata, datasize, __init_begin, init_data_size);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:41: note: use '&__init_begin[0] < &_edata[0]' to compare the addresses
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                                         ^
   mm/page_alloc.c:7498:9: note: in expansion of macro 'adj_init_size'
    7498 |         adj_init_size(_sdata, _edata, datasize, __init_begin, init_data_size);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:27: warning: comparison between two arrays [-Warray-compare]
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                           ^~
   mm/page_alloc.c:7499:9: note: in expansion of macro 'adj_init_size'
    7499 |         adj_init_size(_stext, _etext, codesize, __start_rodata, rosize);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:27: note: use '&_stext[0] <= &__start_rodata[0]' to compare the addresses
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                           ^~
   mm/page_alloc.c:7499:9: note: in expansion of macro 'adj_init_size'
    7499 |         adj_init_size(_stext, _etext, codesize, __start_rodata, rosize);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:41: warning: comparison between two arrays [-Warray-compare]
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                                         ^
   mm/page_alloc.c:7499:9: note: in expansion of macro 'adj_init_size'
    7499 |         adj_init_size(_stext, _etext, codesize, __start_rodata, rosize);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:41: note: use '&__start_rodata[0] < &_etext[0]' to compare the addresses
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                                         ^
   mm/page_alloc.c:7499:9: note: in expansion of macro 'adj_init_size'
    7499 |         adj_init_size(_stext, _etext, codesize, __start_rodata, rosize);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:27: warning: comparison between two arrays [-Warray-compare]
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                           ^~
   mm/page_alloc.c:7500:9: note: in expansion of macro 'adj_init_size'
    7500 |         adj_init_size(_sdata, _edata, datasize, __start_rodata, rosize);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:27: note: use '&_sdata[0] <= &__start_rodata[0]' to compare the addresses
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                           ^~
   mm/page_alloc.c:7500:9: note: in expansion of macro 'adj_init_size'
    7500 |         adj_init_size(_sdata, _edata, datasize, __start_rodata, rosize);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:41: warning: comparison between two arrays [-Warray-compare]
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                                         ^
   mm/page_alloc.c:7500:9: note: in expansion of macro 'adj_init_size'
    7500 |         adj_init_size(_sdata, _edata, datasize, __start_rodata, rosize);
         |         ^~~~~~~~~~~~~
   mm/page_alloc.c:7491:41: note: use '&__start_rodata[0] < &_edata[0]' to compare the addresses
    7491 |                 if (start <= pos && pos < end && size > adj) \
         |                                         ^
   mm/page_alloc.c:7500:9: note: in expansion of macro 'adj_init_size'
    7500 |         adj_init_size(_sdata, _edata, datasize, __start_rodata, rosize);
         |         ^~~~~~~~~~~~~
   In file included from mm/page_alloc.c:43:
   include/linux/mempolicy.h: At top level:
include/linux/mempolicy.h:329:13: warning: '__do_mbind' defined but not used [-Wunused-function]
     329 | static long __do_mbind(unsigned long start, unsigned long len,
         |             ^~~~~~~~~~
   In file included from arch/arm64/include/asm/atomic.h:36,
                    from include/linux/atomic.h:7,
                    from include/asm-generic/bitops/atomic.h:5,
                    from arch/arm64/include/asm/bitops.h:37,
                    from include/linux/bitops.h:19,
                    from include/linux/kernel.h:11,
                    from include/asm-generic/bug.h:18,
                    from arch/arm64/include/asm/bug.h:37,
                    from include/linux/bug.h:5,
                    from include/linux/mmdebug.h:5,
                    from include/linux/mm.h:10,
                    from mm/page_alloc.c:18:
   In function '__cmpxchg_case_acq_4',
       inlined from '__cmpxchg_acq' at arch/arm64/include/asm/cmpxchg.h:141:1,
       inlined from 'queued_spin_lock' at include/asm-generic/qspinlock.h:85:8,
       inlined from 'do_raw_spin_lock' at include/linux/spinlock.h:180:2,
       inlined from '__raw_spin_lock' at include/linux/spinlock_api_smp.h:143:2,
       inlined from 'spin_lock' at include/linux/spinlock.h:329:2,
       inlined from '__build_all_zonelists' at mm/page_alloc.c:5730:2:
   arch/arm64/include/asm/atomic_ll_sc.h:259:9: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'spinlock_t[1]' {aka 'struct spinlock[1]'} [-Warray-bounds=]
     259 |         asm volatile(                                                   \
         |         ^~~
   arch/arm64/include/asm/atomic_ll_sc.h:283:1: note: in expansion of macro '__CMPXCHG_CASE'
     283 | __CMPXCHG_CASE(w,  , acq_4,        , a,  , "memory")
         | ^~~~~~~~~~~~~~
   In file included from include/linux/spinlock.h:82,
                    from include/linux/mmzone.h:9,
                    from include/linux/gfp.h:6,
                    from include/linux/mm.h:11:
   mm/page_alloc.c: In function '__build_all_zonelists':
   mm/page_alloc.c:5728:32: note: object 'lock' of size 4
    5728 |         static DEFINE_SPINLOCK(lock);
         |                                ^~~~
   include/linux/spinlock_types.h:81:44: note: in definition of macro 'DEFINE_SPINLOCK'
      81 | #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
         |                                            ^
   In function '__cmpxchg_case_acq_4',
       inlined from '__cmpxchg_acq' at arch/arm64/include/asm/cmpxchg.h:141:1,
       inlined from 'queued_spin_lock' at include/asm-generic/qspinlock.h:85:8,
       inlined from 'do_raw_spin_lock' at include/linux/spinlock.h:180:2,
       inlined from '__raw_spin_lock' at include/linux/spinlock_api_smp.h:143:2,
       inlined from 'spin_lock' at include/linux/spinlock.h:329:2,
       inlined from '__build_all_zonelists' at mm/page_alloc.c:5730:2:
   arch/arm64/include/asm/atomic_ll_sc.h:259:9: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'spinlock_t[1]' {aka 'struct spinlock[1]'} [-Warray-bounds=]
     259 |         asm volatile(                                                   \
         |         ^~~
   arch/arm64/include/asm/atomic_ll_sc.h:283:1: note: in expansion of macro '__CMPXCHG_CASE'
     283 | __CMPXCHG_CASE(w,  , acq_4,        , a,  , "memory")
         | ^~~~~~~~~~~~~~
   mm/page_alloc.c: In function '__build_all_zonelists':
   mm/page_alloc.c:5728:32: note: object 'lock' of size 4
    5728 |         static DEFINE_SPINLOCK(lock);
         |                                ^~~~
   include/linux/spinlock_types.h:81:44: note: in definition of macro 'DEFINE_SPINLOCK'
      81 | #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
         |                                            ^
   In function '__cmpxchg_case_acq_4',
       inlined from '__cmpxchg_acq' at arch/arm64/include/asm/cmpxchg.h:141:1,
       inlined from 'queued_spin_lock' at include/asm-generic/qspinlock.h:85:8,
       inlined from 'do_raw_spin_lock' at include/linux/spinlock.h:180:2,
       inlined from '__raw_spin_lock' at include/linux/spinlock_api_smp.h:143:2,
       inlined from 'spin_lock' at include/linux/spinlock.h:329:2,
       inlined from 'adjust_managed_page_count' at mm/page_alloc.c:7414:2:
   arch/arm64/include/asm/atomic_ll_sc.h:259:9: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'spinlock_t[1]' {aka 'struct spinlock[1]'} [-Warray-bounds=]
     259 |         asm volatile(                                                   \
         |         ^~~
   arch/arm64/include/asm/atomic_ll_sc.h:283:1: note: in expansion of macro '__CMPXCHG_CASE'
     283 | __CMPXCHG_CASE(w,  , acq_4,        , a,  , "memory")
         | ^~~~~~~~~~~~~~
   mm/page_alloc.c: In function 'adjust_managed_page_count':
   mm/page_alloc.c:166:24: note: object 'managed_page_count_lock' of size 4
     166 | static DEFINE_SPINLOCK(managed_page_count_lock);
         |                        ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_types.h:81:44: note: in definition of macro 'DEFINE_SPINLOCK'
      81 | #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
         |                                            ^
   In function '__cmpxchg_case_acq_4',
       inlined from '__cmpxchg_acq' at arch/arm64/include/asm/cmpxchg.h:141:1,
       inlined from 'queued_spin_lock' at include/asm-generic/qspinlock.h:85:8,
       inlined from 'do_raw_spin_lock' at include/linux/spinlock.h:180:2,
       inlined from '__raw_spin_lock' at include/linux/spinlock_api_smp.h:143:2,
       inlined from 'spin_lock' at include/linux/spinlock.h:329:2,
       inlined from 'adjust_managed_page_count' at mm/page_alloc.c:7414:2:
   arch/arm64/include/asm/atomic_ll_sc.h:259:9: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'spinlock_t[1]' {aka 'struct spinlock[1]'} [-Warray-bounds=]
     259 |         asm volatile(                                                   \
         |         ^~~
   arch/arm64/include/asm/atomic_ll_sc.h:283:1: note: in expansion of macro '__CMPXCHG_CASE'
     283 | __CMPXCHG_CASE(w,  , acq_4,        , a,  , "memory")
         | ^~~~~~~~~~~~~~
   mm/page_alloc.c: In function 'adjust_managed_page_count':
   mm/page_alloc.c:166:24: note: object 'managed_page_count_lock' of size 4
     166 | static DEFINE_SPINLOCK(managed_page_count_lock);
         |                        ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_types.h:81:44: note: in definition of macro 'DEFINE_SPINLOCK'
      81 | #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
         |                                            ^
   In function '__cmpxchg_case_acq_4',
       inlined from '__cmpxchg_acq' at arch/arm64/include/asm/cmpxchg.h:141:1,
..
vim +/__do_mbind +329 include/linux/mempolicy.h

   328
...
329	static long __do_mbind(unsigned long start, unsigned long len,
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