[openeuler:openEuler-1.0-LTS 1447/1447] kernel/futex.o: warning: objtool: get_futex_key()+0xf8b: unreachable instruction

[openeuler:openEuler-1.0-LTS 1447/1447] kernel/futex.o: warning: objtool: get_futex_key()+0xf8b: unreachable instruction

[kernel test robot]

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   fa7c6902e19233b35b7caf7c8d591f1c48aa2be1
commit: b404141975c53fb7b92d74e28466b98b81db4b2e [1447/1447] futex: Provide and use pi_state_update_owner()
config: x86_64-buildonly-randconfig-002-20250306 (https://download.01.org/0day-ci/archive/20250307/202503070152.Lezu4e8K-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/20250307/202503070152.Lezu4e8K-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/202503070152.Lezu4e8K-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/futex.c:56:
   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;
         |                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 warning generated.
>> kernel/futex.o: warning: objtool: get_futex_key()+0xf8b: unreachable instruction

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki