Re: [PATCH bpf-next v2 4/6] bpf: Introduce css_descendant open-coded iterator kfuncs

kernel test robot
2023-09-13T07:27:33Z

Hi Chuyi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bpf-next/master]

url: https://github.com/intel-lab-lkp/linux/commits/Chuyi-Zhou/cgroup-Prepare-for-using-css_task_iter_-in-BPF/20230912-150454
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link: https://lore.kernel.org/r/20230912070149.969939-5-zhouchuyi%40bytedance.com
patch subject: [PATCH bpf-next v2 4/6] bpf: Introduce css_descendant open-coded iterator kfuncs
config: s390-defconfig (https://download.01.org/0day-ci/archive/20230913/202309131500.J19z0Dil-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230913/202309131500.J19z0Dil-lkp@intel.com/reproduce)

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/202309131500.J19z0Dil-lkp@intel.com/

All warnings (new ones prefixed by >>):

kernel/bpf/task_iter.c:810:17: warning: no previous prototype for 'bpf_iter_css_task_new' [-Wmissing-prototypes]
810 | __bpf_kfunc int bpf_iter_css_task_new(struct bpf_iter_css_task *it,
| ^~~~~~~~~~~~~~~~~~~~~
kernel/bpf/task_iter.c:835:33: warning: no previous prototype for 'bpf_iter_css_task_next' [-Wmissing-prototypes]
835 | __bpf_kfunc struct task_struct *bpf_iter_css_task_next(struct bpf_iter_css_task *it)
| ^~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/task_iter.c:844:18: warning: no previous prototype for 'bpf_iter_css_task_destroy' [-Wmissing-prototypes]
844 | __bpf_kfunc void bpf_iter_css_task_destroy(struct bpf_iter_css_task *it)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/task_iter.c:858:17: warning: no previous prototype for 'bpf_iter_process_new' [-Wmissing-prototypes]
858 | __bpf_kfunc int bpf_iter_process_new(struct bpf_iter_process *it)
| ^~~~~~~~~~~~~~~~~~~~
kernel/bpf/task_iter.c:870:33: warning: no previous prototype for 'bpf_iter_process_next' [-Wmissing-prototypes]
870 | __bpf_kfunc struct task_struct *bpf_iter_process_next(struct bpf_iter_process *it)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/bpf/task_iter.c:879:18: warning: no previous prototype for 'bpf_iter_process_destroy' [-Wmissing-prototypes]
879 | __bpf_kfunc void bpf_iter_process_destroy(struct bpf_iter_process *it)
| ^~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/bpf/task_iter.c:888:17: warning: no previous prototype for 'bpf_iter_css_pre_new' [-Wmissing-prototypes]
888 | __bpf_kfunc int bpf_iter_css_pre_new(struct bpf_iter_css_pre *it,
| ^~~~~~~~~~~~~~~~~~~~
>> kernel/bpf/task_iter.c:900:41: warning: no previous prototype for 'bpf_iter_css_pre_next' [-Wmissing-prototypes]
900 | __bpf_kfunc struct cgroup_subsys_state *bpf_iter_css_pre_next(struct bpf_iter_css_pre *it)
| ^~~~~~~~~~~~~~~~~~~~~
>> kernel/bpf/task_iter.c:908:18: warning: no previous prototype for 'bpf_iter_css_pre_destroy' [-Wmissing-prototypes]
908 | __bpf_kfunc void bpf_iter_css_pre_destroy(struct bpf_iter_css_pre *it)
| ^~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/bpf/task_iter.c:912:17: warning: no previous prototype for 'bpf_iter_css_post_new' [-Wmissing-prototypes]
912 | __bpf_kfunc int bpf_iter_css_post_new(struct bpf_iter_css_post *it,
| ^~~~~~~~~~~~~~~~~~~~~
>> kernel/bpf/task_iter.c:924:41: warning: no previous prototype for 'bpf_iter_css_post_next' [-Wmissing-prototypes]
924 | __bpf_kfunc struct cgroup_subsys_state *bpf_iter_css_post_next(struct bpf_iter_css_post *it)
| ^~~~~~~~~~~~~~~~~~~~~~
>> kernel/bpf/task_iter.c:932:18: warning: no previous prototype for 'bpf_iter_css_post_destroy' [-Wmissing-prototypes]
932 | __bpf_kfunc void bpf_iter_css_post_destroy(struct bpf_iter_css_post *it)
| ^~~~~~~~~~~~~~~~~~~~~~~~~

vim +/bpf_iter_css_pre_new +888 kernel/bpf/task_iter.c

887
> 888 __bpf_kfunc int bpf_iter_css_pre_new(struct bpf_iter_css_pre *it,
889 struct cgroup_subsys_state *root)
890 {
891 struct bpf_iter_css_kern *kit = (void *)it;
892
893 BUILD_BUG_ON(sizeof(struct bpf_iter_css_kern) != sizeof(struct bpf_iter_css_pre));
894 BUILD_BUG_ON(__alignof__(struct bpf_iter_css_kern) != __alignof__(struct bpf_iter_css_pre));
895 kit->root = root;
896 kit->pos = NULL;
897 return 0;
898 }
899
> 900 __bpf_kfunc struct cgroup_subsys_state *bpf_iter_css_pre_next(struct bpf_iter_css_pre *it)
901 {
902 struct bpf_iter_css_kern *kit = (void *)it;
903
904 kit->pos = css_next_descendant_pre(kit->pos, kit->root);
905 return kit->pos;
906 }
907
> 908 __bpf_kfunc void bpf_iter_css_pre_destroy(struct bpf_iter_css_pre *it)
909 {
910 }
911
> 912 __bpf_kfunc int bpf_iter_css_post_new(struct bpf_iter_css_post *it,
913 struct cgroup_subsys_state *root)
914 {
915 struct bpf_iter_css_kern *kit = (void *)it;
916
917 BUILD_BUG_ON(sizeof(struct bpf_iter_css_kern) != sizeof(struct bpf_iter_css_post));
918 BUILD_BUG_ON(__alignof__(struct bpf_iter_css_kern) != __alignof__(struct bpf_iter_css_post));
919 kit->root = root;
920 kit->pos = NULL;
921 return 0;
922 }
923
> 924 __bpf_kfunc struct cgroup_subsys_state *bpf_iter_css_post_next(struct bpf_iter_css_post *it)
925 {
926 struct bpf_iter_css_kern *kit = (void *)it;
927
928 kit->pos = css_next_descendant_post(kit->pos, kit->root);
929 return kit->pos;
930 }
931
> 932 __bpf_kfunc void bpf_iter_css_post_destroy(struct bpf_iter_css_post *it)
933 {
934 }
935

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