kernel/bpf/helpers.c:1887:7: warning: no previous declaration for 'bpf_rdonly_cast'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4853c74bd7ab7fdb83f319bd9ace8a08c031e9b6
commit: a35b9af4ec2c7f69286ef861fd2074a577e354cb bpf: Add a kfunc for generic type cast
date:   9 months ago
config: x86_64-randconfig-x012-20230816 (https://download.01.org/0day-ci/archive/20230817/202308171347.v9awguFg-lkp@xxxxxxxxx/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce: (https://download.01.org/0day-ci/archive/20230817/202308171347.v9awguFg-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/202308171347.v9awguFg-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   kernel/bpf/helpers.c:1757:7: warning: no previous declaration for 'bpf_obj_new_impl' [-Wmissing-declarations]
    void *bpf_obj_new_impl(u64 local_type_id__k, void *meta__ign)
          ^~~~~~~~~~~~~~~~
   kernel/bpf/helpers.c:1771:6: warning: no previous declaration for 'bpf_obj_drop_impl' [-Wmissing-declarations]
    void bpf_obj_drop_impl(void *p__alloc, void *meta__ign)
         ^~~~~~~~~~~~~~~~~
   kernel/bpf/helpers.c:1792:6: warning: no previous declaration for 'bpf_list_push_front' [-Wmissing-declarations]
    void bpf_list_push_front(struct bpf_list_head *head, struct bpf_list_node *node)
         ^~~~~~~~~~~~~~~~~~~
   kernel/bpf/helpers.c:1797:6: warning: no previous declaration for 'bpf_list_push_back' [-Wmissing-declarations]
    void bpf_list_push_back(struct bpf_list_head *head, struct bpf_list_node *node)
         ^~~~~~~~~~~~~~~~~~
   kernel/bpf/helpers.c:1815:23: warning: no previous declaration for 'bpf_list_pop_front' [-Wmissing-declarations]
    struct bpf_list_node *bpf_list_pop_front(struct bpf_list_head *head)
                          ^~~~~~~~~~~~~~~~~~
   kernel/bpf/helpers.c:1820:23: warning: no previous declaration for 'bpf_list_pop_back' [-Wmissing-declarations]
    struct bpf_list_node *bpf_list_pop_back(struct bpf_list_head *head)
                          ^~~~~~~~~~~~~~~~~
   kernel/bpf/helpers.c:1831:21: warning: no previous declaration for 'bpf_task_acquire' [-Wmissing-declarations]
    struct task_struct *bpf_task_acquire(struct task_struct *p)
                        ^~~~~~~~~~~~~~~~
   kernel/bpf/helpers.c:1843:21: warning: no previous declaration for 'bpf_task_kptr_get' [-Wmissing-declarations]
    struct task_struct *bpf_task_kptr_get(struct task_struct **pp)
                        ^~~~~~~~~~~~~~~~~
   kernel/bpf/helpers.c:1874:6: warning: no previous declaration for 'bpf_task_release' [-Wmissing-declarations]
    void bpf_task_release(struct task_struct *p)
         ^~~~~~~~~~~~~~~~
   kernel/bpf/helpers.c:1882:7: warning: no previous declaration for 'bpf_cast_to_kern_ctx' [-Wmissing-declarations]
    void *bpf_cast_to_kern_ctx(void *obj)
          ^~~~~~~~~~~~~~~~~~~~
>> kernel/bpf/helpers.c:1887:7: warning: no previous declaration for 'bpf_rdonly_cast' [-Wmissing-declarations]
    void *bpf_rdonly_cast(void *obj__ign, u32 btf_id__k)
          ^~~~~~~~~~~~~~~


vim +/bpf_rdonly_cast +1887 kernel/bpf/helpers.c

  1886	
> 1887	void *bpf_rdonly_cast(void *obj__ign, u32 btf_id__k)
  1888	{
  1889		return obj__ign;
  1890	}
  1891	

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