linux-kernel - [daniel-thompson:kdb/seq_file 1/5] include/linux/kdb.h:217:33: warning: declaration of 'struct seq_operations' will not be visible outside of this function

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Date:   Thu, 14 Apr 2022 02:48:14 +0800
From:   kernel test robot <lkp@...el.com>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [daniel-thompson:kdb/seq_file 1/5] include/linux/kdb.h:217:33:
 warning: declaration of 'struct seq_operations' will not be visible outside
 of this function

tree:   https://git.linaro.org/people/daniel.thompson/linux.git kdb/seq_file
head:   b58798cd87e95bdb8832940ba312ce920de71613
commit: e333b2ce40d76f3250a29a610671861f5ad0689c [1/5] kdb: Add framework to display sequence files
config: arm64-buildonly-randconfig-r003-20220413 (https://download.01.org/0day-ci/archive/20220414/202204140223.LWUYoH9B-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 6b7e6ea489f6dd45a9b0da9ac20871560917b9b0)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        git remote add daniel-thompson https://git.linaro.org/people/daniel.thompson/linux.git
        git fetch --no-tags daniel-thompson kdb/seq_file
        git checkout e333b2ce40d76f3250a29a610671861f5ad0689c
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash kernel/printk/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from kernel/printk/printk_safe.c:7:
>> include/linux/kdb.h:217:33: warning: declaration of 'struct seq_operations' will not be visible outside of this function [-Wvisibility]
   kdb_print_seq_file(const struct seq_operations *ops) { return 0; }
                                   ^
   1 warning generated.


vim +217 include/linux/kdb.h

   210	
   211	/* Dynamic kdb shell command registration */
   212	extern int kdb_register(kdbtab_t *cmd);
   213	extern void kdb_unregister(kdbtab_t *cmd);
   214	#else /* ! CONFIG_KGDB_KDB */
   215	static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; }
   216	static inline int
 > 217	kdb_print_seq_file(const struct seq_operations *ops) { return 0; }
   218	static inline void kdb_init(int level) {}
   219	static inline int kdb_register(kdbtab_t *cmd) { return 0; }
   220	static inline void kdb_unregister(kdbtab_t *cmd) {}
   221	#endif	/* CONFIG_KGDB_KDB */
   222	enum {
   223		KDB_NOT_INITIALIZED,
   224		KDB_INIT_EARLY,
   225		KDB_INIT_FULL,
   226	};
   227	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp