[openeuler:openEuler-1.0-LTS 7838/23859] fs/debugfs/file.o: warning: objtool: full_proxy_open()+0x55b: unreachable instruction

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

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   d2a40c79ddef4b96b8a7a396bd7273121b1b4a5c
commit: d4bdc26bcd632cee393b5171345d5fa6293fe42b [7838/23859] include/asm-generic/bug.h: fix "cut here" for WARN_ON for __WARN_TAINT architectures
config: x86_64-randconfig-004-20241025 (https://download.01.org/0day-ci/archive/20241025/202410251924.cmJOufCW-lkp@intel.com/config)
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/20241025/202410251924.cmJOufCW-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/202410251924.cmJOufCW-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from fs/debugfs/file.c:15:
   include/linux/pagemap.h:401:21: 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]
     401 |         filler_t *filler = (filler_t *)mapping->a_ops->readpage;
         |                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 warning generated.
>> fs/debugfs/file.o: warning: objtool: full_proxy_open()+0x55b: unreachable instruction
--
   In file included from drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c:27:
   In file included from include/drm/drmP.h:62:
   In file included from arch/x86/include/asm/pgalloc.h:7:
   include/linux/pagemap.h:401:21: 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]
     401 |         filler_t *filler = (filler_t *)mapping->a_ops->readpage;
         |                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 warning generated.
   drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c:271: warning: Function parameter or member 'id' not described in 'amdgpu_vmid_grab_reserved'
   drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c:520: warning: Function parameter or member 'vmhub' not described in 'amdgpu_vmid_reset'
>> drivers/gpu/drm/amd/amdgpu/amdgpu_ids.o: warning: objtool: amdgpu_vmid_grab()+0xd5c: unreachable instruction

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