Hi 闫海涛, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: b7a3f4f16ebfb6b033fe4f7de8908062eb84a55b commit: 18e360871c3f648ecb0d8cc9b23fd4268a64c17f [3508/3508] add enfs feature config: x86_64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20251210/202512101401.oMRwRHrx-lkp@i...) compiler: gcc-14 (Debian 14.2.0-19) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251210/202512101401.oMRwRHrx-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/202512101401.oMRwRHrx-lkp@intel.com/ All warnings (new ones prefixed by >>):

...

fs/nfs/dir.c:1498:6: warning: no previous prototype for 'nfs_check_have_lookup_cache_flag' [-Wmissing-prototypes] 1498 | bool nfs_check_have_lookup_cache_flag(struct nfs_server *server, int flag) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/nfs_check_have_lookup_cache_flag +1498 fs/nfs/dir.c 1497

1498 bool nfs_check_have_lookup_cache_flag(struct nfs_server *server, int flag) 1499 { 1500 #if IS_ENABLED(CONFIG_ENFS) 1501 return enfs_check_have_lookup_cache_flag(server, flag); 1502 #else 1503 return (server->flags & NFS_MOUNT_LOOKUP_CACHE_NONE); 1504 #endif 1505 } 1506

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