kernel/bpf/cgroup_iter.c:336:41: warning: no previous declaration for 'bpf_iter_css_next'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   21e80f3841c01aeaf32d7aee7bbc87b3db1aa0c6
commit: 7251d0905e7518bcb990c8e9a3615b1bb23c78f2 bpf: Introduce css open-coded iterator kfuncs
date:   13 days ago
config: i386-randconfig-141-20231102 (https://download.01.org/0day-ci/archive/20231102/202311021749.8NSp1DM4-lkp@xxxxxxxxx/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231102/202311021749.8NSp1DM4-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311021749.8NSp1DM4-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   kernel/bpf/cgroup_iter.c:312:17: warning: no previous declaration for 'bpf_iter_css_new' [-Wmissing-declarations]
    __bpf_kfunc int bpf_iter_css_new(struct bpf_iter_css *it,
                    ^~~~~~~~~~~~~~~~
>> kernel/bpf/cgroup_iter.c:336:41: warning: no previous declaration for 'bpf_iter_css_next' [-Wmissing-declarations]
    __bpf_kfunc struct cgroup_subsys_state *bpf_iter_css_next(struct bpf_iter_css *it)
                                            ^~~~~~~~~~~~~~~~~
>> kernel/bpf/cgroup_iter.c:357:18: warning: no previous declaration for 'bpf_iter_css_destroy' [-Wmissing-declarations]
    __bpf_kfunc void bpf_iter_css_destroy(struct bpf_iter_css *it)
                     ^~~~~~~~~~~~~~~~~~~~


vim +/bpf_iter_css_next +336 kernel/bpf/cgroup_iter.c

   335	
 > 336	__bpf_kfunc struct cgroup_subsys_state *bpf_iter_css_next(struct bpf_iter_css *it)
   337	{
   338		struct bpf_iter_css_kern *kit = (void *)it;
   339	
   340		if (!kit->start)
   341			return NULL;
   342	
   343		switch (kit->flags) {
   344		case BPF_CGROUP_ITER_DESCENDANTS_PRE:
   345			kit->pos = css_next_descendant_pre(kit->pos, kit->start);
   346			break;
   347		case BPF_CGROUP_ITER_DESCENDANTS_POST:
   348			kit->pos = css_next_descendant_post(kit->pos, kit->start);
   349			break;
   350		case BPF_CGROUP_ITER_ANCESTORS_UP:
   351			kit->pos = kit->pos ? kit->pos->parent : kit->start;
   352		}
   353	
   354		return kit->pos;
   355	}
   356	
 > 357	__bpf_kfunc void bpf_iter_css_destroy(struct bpf_iter_css *it)
   358	{
   359	}
   360	

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