[linux-next:master 6297/7959] kernel/bpf/helpers.c:1389:29: sparse: sparse: symbol 'bpf_kptr_xchg_proto' was not declared. Should it be static?

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   5469f0c06732a077c70a759a81f2a1f00b277694
commit: c0a5a21c25f37c9fd7b36072f9968cdff1e4aa13 [6297/7959] bpf: Allow storing referenced kptr in map
config: x86_64-randconfig-s022 (https://download.01.org/0day-ci/archive/20220430/202204300646.B29EmUql-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=c0a5a21c25f37c9fd7b36072f9968cdff1e4aa13
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout c0a5a21c25f37c9fd7b36072f9968cdff1e4aa13
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/bpf/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>


sparse warnings: (new ones prefixed by >>)
>> kernel/bpf/helpers.c:1389:29: sparse: sparse: symbol 'bpf_kptr_xchg_proto' was not declared. Should it be static?

Please review and possibly fold the followup patch.

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