tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 43d8c124ec4624389b14d42595e5f0195e3e5a1d commit: 1afa15e45da121993a15941b08fef5e3d58f40e5 [2679/2679] bpf-rvi: Add bpf_seq_file_append() kfunc config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20250815/202508150748.bPjkF4cw-lkp@i...) compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250815/202508150748.bPjkF4cw-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/202508150748.bPjkF4cw-lkp@intel.com/ All warnings (new ones prefixed by >>): kernel/bpf-rvi/common_kfuncs.c:20:32: warning: no previous prototype for function 'bpf_mem_cgroup_from_task' [-Wmissing-prototypes] 20 | __bpf_kfunc struct mem_cgroup *bpf_mem_cgroup_from_task(struct task_struct *p) | ^ kernel/bpf-rvi/common_kfuncs.c:20:13: note: declare 'static' if the function is not intended to be used outside of this translation unit 20 | __bpf_kfunc struct mem_cgroup *bpf_mem_cgroup_from_task(struct task_struct *p) | ^ | static kernel/bpf-rvi/common_kfuncs.c:29:35: warning: no previous prototype for function 'bpf_task_active_pid_ns' [-Wmissing-prototypes] 29 | __bpf_kfunc struct pid_namespace *bpf_task_active_pid_ns(struct task_struct *task) | ^ kernel/bpf-rvi/common_kfuncs.c:29:13: note: declare 'static' if the function is not intended to be used outside of this translation unit 29 | __bpf_kfunc struct pid_namespace *bpf_task_active_pid_ns(struct task_struct *task) | ^ | static kernel/bpf-rvi/common_kfuncs.c:34:17: warning: no previous prototype for function 'bpf_pidns_nr_tasks' [-Wmissing-prototypes] 34 | __bpf_kfunc u64 bpf_pidns_nr_tasks(struct pid_namespace *ns) | ^ kernel/bpf-rvi/common_kfuncs.c:34:13: note: declare 'static' if the function is not intended to be used outside of this translation unit 34 | __bpf_kfunc u64 bpf_pidns_nr_tasks(struct pid_namespace *ns) | ^ | static kernel/bpf-rvi/common_kfuncs.c:48:17: warning: no previous prototype for function 'bpf_pidns_last_pid' [-Wmissing-prototypes] 48 | __bpf_kfunc u32 bpf_pidns_last_pid(struct pid_namespace *ns) | ^ kernel/bpf-rvi/common_kfuncs.c:48:13: note: declare 'static' if the function is not intended to be used outside of this translation unit 48 | __bpf_kfunc u32 bpf_pidns_last_pid(struct pid_namespace *ns) | ^ | static kernel/bpf-rvi/common_kfuncs.c:77:18: warning: no previous prototype for function 'bpf_si_memswinfo' [-Wmissing-prototypes] 77 | __bpf_kfunc void bpf_si_memswinfo(struct bpf_sysinfo *bsi) | ^ kernel/bpf-rvi/common_kfuncs.c:77:13: note: declare 'static' if the function is not intended to be used outside of this translation unit 77 | __bpf_kfunc void bpf_si_memswinfo(struct bpf_sysinfo *bsi) | ^ | static kernel/bpf-rvi/common_kfuncs.c:87:27: warning: no previous prototype for function 'bpf_page_counter_read' [-Wmissing-prototypes] 87 | __bpf_kfunc unsigned long bpf_page_counter_read(struct page_counter *counter) | ^ kernel/bpf-rvi/common_kfuncs.c:87:13: note: declare 'static' if the function is not intended to be used outside of this translation unit 87 | __bpf_kfunc unsigned long bpf_page_counter_read(struct page_counter *counter) | ^ | static

...

kernel/bpf-rvi/common_kfuncs.c:97:18: warning: no previous prototype for function 'bpf_seq_file_append' [-Wmissing-prototypes] 97 | __bpf_kfunc void bpf_seq_file_append(struct seq_file *dst, struct seq_file *src) | ^ kernel/bpf-rvi/common_kfuncs.c:97:13: note: declare 'static' if the function is not intended to be used outside of this translation unit 97 | __bpf_kfunc void bpf_seq_file_append(struct seq_file *dst, struct seq_file *src) | ^ | static 7 warnings generated.

vim +/bpf_seq_file_append +97 kernel/bpf-rvi/common_kfuncs.c 91 92 /* 93 * Stat related kfuncs 94 */ 95 96 /* Moving src's content to the end of dst. Reference: seq_vprintf. */

97 __bpf_kfunc void bpf_seq_file_append(struct seq_file *dst, struct seq_file *src) 98 { 99 /* 100 * ->count: length of content 101 * ->size: available buffer space 102 * i.e. seq_printf(dst, "%s", src->buf) 103 */ 104 if (dst->count < dst->size) 105 if (src->count < dst->size - dst->count) { 106 memmove(dst->buf + dst->count, src->buf, src->count); 107 dst->count += src->count; 108 } 109 } 110

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