[openeuler:openEuler-1.0-LTS 19041/23581] fs/f2fs/.tmp_gc.o: warning: objtool: do_garbage_collect()+0xe35: unreachable instruction

[openeuler:openEuler-1.0-LTS 19041/23581] fs/f2fs/.tmp_gc.o: warning: objtool: do_garbage_collect()+0xe35: unreachable instruction

[kernel test robot]

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   46d28312ab3cc0cfe7e8dea2f41d22fe4ac35e67
commit: 584279e21249fcd4d9774a566420de500c90f472 [19041/23581] f2fs: fix to do sanity check on inode type during garbage collection
config: x86_64-buildonly-randconfig-004-20240825 (https://download.01.org/0day-ci/archive/20240828/202408281910.ImD8ZAp3-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240828/202408281910.ImD8ZAp3-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/202408281910.ImD8ZAp3-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from fs/f2fs/gc.c:13:
   In file included from include/linux/backing-dev.h:15:
   In file included from include/linux/blkdev.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;
         |                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 warning generated.
>> fs/f2fs/.tmp_gc.o: warning: objtool: do_garbage_collect()+0xe35: unreachable instruction

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