[openeuler:openEuler-1.0-LTS 1225/1225] mm/memory.o: warning: objtool: __apply_to_page_range()+0x67c: unreachable instruction

6 Nov 2024

      tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   e33ed48bc600febcdca9e71e43cf224934dadc4f
commit: dd365884b743523ae70dbbf469bca8168f40ba93 [1225/1225] mm/memory.c: add apply_to_existing_page_range() helper
config: x86_64-buildonly-randconfig-002-20241028 (https://download.01.org/0day-ci/archive/20241106/202411061528.694k8VkC-lkp@i...)
compiler: clang version 19.1.2 (https://github.com/llvm/llvm-project 7ba7d8e2f7b6445b60679da826210cdde29eaf8b)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241106/202411061528.694k8VkC-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/202411061528.694k8VkC-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from mm/memory.c:47:
   In file included from include/linux/hugetlb.h:44:
   In file included from include/linux/mempolicy.h:16:
   include/linux/pagemap.h:425:21: warning: cast from 'int (*)(struct file *, struct page *)' to 'filler_t *' (aka 'int (*)(void *, struct page *)') converts to incompatible function type [-Wcast-function-type-strict]
     425 |         filler_t *filler = (filler_t *)mapping->a_ops->readpage;
         |                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   mm/memory.c:4707:3: warning: cast from 'int (*)(unsigned long, unsigned long, struct cgp_args *)' to 'ktask_thread_func' (aka 'int (*)(void *, void *, void *)') converts to incompatible function type [-Wcast-function-type-strict]
    4707 |                 DEFINE_KTASK_CTL(ctl, clear_gigantic_page_chunk, &args,
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    4708 |                                  KTASK_PTE_MINCHUNK);
         |                                  ~~~~~~~~~~~~~~~~~~~
   include/linux/ktask.h:139:3: note: expanded from macro 'DEFINE_KTASK_CTL'
     139 |                 KTASK_CTL_INITIALIZER(thread_func, func_arg, min_chunk_size) \
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/ktask.h:123:21: note: expanded from macro 'KTASK_CTL_INITIALIZER'
     123 |                 .kc_thread_func = (ktask_thread_func)(thread_func),          \
         |                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   2 warnings generated.
...
...
mm/memory.o: warning: objtool: __apply_to_page_range()+0x67c: unreachable instruction
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