Hi GONG, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 423fccda72fc2b78107cc119a1755d968c2c36de commit: 19895b9974c36318281e4e18131a2cfb43543ffd [3529/3529] bpf-rvi: Add stat-related misc kfuncs config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20251211/202512110945.4orBvyVq-lkp@i...) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251211/202512110945.4orBvyVq-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/202512110945.4orBvyVq-lkp@intel.com/ All warnings (new ones prefixed by >>): fs/proc/stat.c:224:17: warning: no previous prototype for function 'bpf_get_idle_time' [-Wmissing-prototypes] 224 | __bpf_kfunc u64 bpf_get_idle_time(struct kernel_cpustat *kcs, int cpu) | ^ fs/proc/stat.c:224:13: note: declare 'static' if the function is not intended to be used outside of this translation unit 224 | __bpf_kfunc u64 bpf_get_idle_time(struct kernel_cpustat *kcs, int cpu) | ^ | static fs/proc/stat.c:229:17: warning: no previous prototype for function 'bpf_get_iowait_time' [-Wmissing-prototypes] 229 | __bpf_kfunc u64 bpf_get_iowait_time(struct kernel_cpustat *kcs, int cpu) | ^ fs/proc/stat.c:229:13: note: declare 'static' if the function is not intended to be used outside of this translation unit 229 | __bpf_kfunc u64 bpf_get_iowait_time(struct kernel_cpustat *kcs, int cpu) | ^ | static

...

fs/proc/stat.c:234:18: warning: no previous prototype for function 'bpf_show_all_irqs' [-Wmissing-prototypes] 234 | __bpf_kfunc void bpf_show_all_irqs(struct seq_file *p) | ^ fs/proc/stat.c:234:13: note: declare 'static' if the function is not intended to be used outside of this translation unit 234 | __bpf_kfunc void bpf_show_all_irqs(struct seq_file *p) | ^ | static 3 warnings generated.

vim +/bpf_show_all_irqs +234 fs/proc/stat.c 233

234 __bpf_kfunc void bpf_show_all_irqs(struct seq_file *p) 235 { 236 show_all_irqs(p); 237 } 238

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