[kkdwivedi:fermata 17/21] kernel/bpf/helpers.c:2407:18: sparse: sparse: symbol 'bpf_coro_frame_free' was not declared. Should it be static?

tree:   https://github.com/kkdwivedi/linux fermata
head:   0ebfd4123c6b1719f428de91a4e4eeca34f557f6
commit: d291ea9d36a15dcf8e45bfe20d47b2bee5c59963 [17/21] bpf: Add PTR_TO_CORO_FRAME runtime and verifier support
config: csky-randconfig-r113-20260807 (https://download.01.org/0day-ci/archive/20260808/[email protected]/config)
compiler: csky-linux-gcc (GCC) 16.1.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260808/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

sparse warnings: (new ones prefixed by >>)
   kernel/bpf/helpers.c:1228:21: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected unsigned long long ( *[usertype] callback_fn )( ... ) @@     got void [noderef] __rcu * @@
   kernel/bpf/helpers.c:1228:21: sparse:     expected unsigned long long ( *[usertype] callback_fn )( ... )
   kernel/bpf/helpers.c:1228:21: sparse:     got void [noderef] __rcu *
>> kernel/bpf/helpers.c:2407:18: sparse: sparse: symbol 'bpf_coro_frame_free' was not declared. Should it be static?
   kernel/bpf/helpers.c:2865:18: sparse: sparse: symbol 'bpf_task_release_dtor' was not declared. Should it be static?
   kernel/bpf/helpers.c:2895:18: sparse: sparse: symbol 'bpf_cgroup_release_dtor' was not declared. Should it be static?

vim +/bpf_coro_frame_free +2407 kernel/bpf/helpers.c

  2406	
> 2407	__bpf_kfunc void bpf_coro_frame_free(void *p)
  2408	{
  2409		kfree_nolock(p);
  2410	}
  2411	

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