Hi Yu, FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant. tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: 46d28312ab3cc0cfe7e8dea2f41d22fe4ac35e67 commit: 9d0422bf311dfb36617e4d8f7367a3e7dc9179ec [20748/23581] nbd: fold nbd config initialization into nbd_alloc_config() config: x86_64-buildonly-randconfig-004-20240825 (https://download.01.org/0day-ci/archive/20240829/202408290453.uMJshGum-lkp@i...) 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/20240829/202408290453.uMJshGum-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/202408290453.uMJshGum-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from drivers/block/nbd.c:17: 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.

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drivers/block/.tmp_nbd.o: warning: objtool: nbd_alloc_and_init_config()+0x165: unreachable instruction

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