[openeuler:openEuler-1.0-LTS 1343/1343] fs/ext4/mballoc.o: warning: objtool: ext4_mb_complex_scan_group()+0x11a4: unreachable instruction

[kernel test robot <lkp@intel.com>]

Hi Theodore,

FYI, the error/warning still remains.

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   da51139d17e9d53d61a9877d9042e43b85d71ee1
commit: 41298197ead9e85ee2ec1d52122f03fd1863cff2 [1343/1343] ext4: convert BUG_ON's to WARN_ON's in mballoc.c
config: x86_64-randconfig-101-20241223 (https://download.01.org/0day-ci/archive/20250205/202502050119.jyApN4Fx-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250205/202502050119.jyApN4Fx-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/202502050119.jyApN4Fx-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from fs/ext4/mballoc.c:12:
   In file included from fs/ext4/ext4_jbd2.h:16:
   In file included from include/linux/jbd2.h:26:
   In file included from include/linux/buffer_head.h:14:
   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/ext4/mballoc.c:4734: warning: Function parameter or member 'bh' not described in 'ext4_free_blocks'
>> fs/ext4/mballoc.o: warning: objtool: ext4_mb_complex_scan_group()+0x11a4: unreachable instruction

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