netdev - [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?

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Date:   Sat, 30 Apr 2022 06:34:28 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kumar Kartikeya Dwivedi <memxor@...il.com>
Cc:     kbuild-all@...ts.01.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [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?

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@intel.com/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@...el.com>


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.

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp