linux-kernel - [toke:xdp-queueing-01 2/9] kernel/bpf/btf.c:4550:9: error: initialized field overwritten

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Message-ID: <202111130419.0Kakhm15-lkp@intel.com>
Date:   Sat, 13 Nov 2021 04:24:28 +0800
From:   kernel test robot <lkp@...el.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [toke:xdp-queueing-01 2/9] kernel/bpf/btf.c:4550:9: error:
 initialized field overwritten

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git xdp-queueing-01
head:   7cdc645073a59261514e56e1a4c6d0dac1b24b32
commit: 64155ff31b7e15635ccae5395cf57caa0834faba [2/9] xdp: add dequeue program type for getting packets from a PIFO
config: s390-allyesconfig (attached as .config)
compiler: s390-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git/commit/?id=64155ff31b7e15635ccae5395cf57caa0834faba
        git remote add toke https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git
        git fetch --no-tags toke xdp-queueing-01
        git checkout 64155ff31b7e15635ccae5395cf57caa0834faba
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=s390 

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

All errors (new ones prefixed by >>):

>> kernel/bpf/btf.c:4550:9: error: initialized field overwritten [-Werror=override-init]
    4550 |         0, /* avoid empty array */
         |         ^
   kernel/bpf/btf.c:4550:9: note: (near initialization for 'bpf_ctx_convert_map[32]')
   kernel/bpf/btf.c: In function 'btf_seq_show':
   kernel/bpf/btf.c:5876:29: error: function 'btf_seq_show' might be a candidate for 'gnu_printf' format attribute [-Werror=suggest-attribute=format]
    5876 |         seq_vprintf((struct seq_file *)show->target, fmt, args);
         |                             ^~~~~~~~
   kernel/bpf/btf.c: In function 'btf_snprintf_show':
   kernel/bpf/btf.c:5913:9: error: function 'btf_snprintf_show' might be a candidate for 'gnu_printf' format attribute [-Werror=suggest-attribute=format]
    5913 |         len = vsnprintf(show->target, ssnprintf->len_left, fmt, args);
         |         ^~~
   cc1: all warnings being treated as errors


vim +4550 kernel/bpf/btf.c

91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4524  
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4525  #define BPF_MAP_TYPE(_id, _ops)
f2e10bff16a0fdd Andrii Nakryiko    2020-04-28  4526  #define BPF_LINK_TYPE(_id, _name)
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4527  static union {
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4528  	struct bpf_ctx_convert {
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4529  #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4530  	prog_ctx_type _id##_prog; \
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4531  	kern_ctx_type _id##_kern;
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4532  #include <linux/bpf_types.h>
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4533  #undef BPF_PROG_TYPE
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4534  	} *__t;
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4535  	/* 't' is written once under lock. Read many times. */
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4536  	const struct btf_type *t;
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4537  } bpf_ctx_convert;
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4538  enum {
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4539  #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4540  	__ctx_convert##_id,
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4541  #include <linux/bpf_types.h>
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4542  #undef BPF_PROG_TYPE
ce27709b8162e5c Alexei Starovoitov 2019-11-27  4543  	__ctx_convert_unused, /* to avoid empty enum in extreme .config */
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4544  };
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4545  static u8 bpf_ctx_convert_map[] = {
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4546  #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4547  	[_id] = __ctx_convert##_id,
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4548  #include <linux/bpf_types.h>
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4549  #undef BPF_PROG_TYPE
4c80c7bc583a87d Arnd Bergmann      2019-12-10 @4550  	0, /* avoid empty array */
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4551  };
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4552  #undef BPF_MAP_TYPE
f2e10bff16a0fdd Andrii Nakryiko    2020-04-28  4553  #undef BPF_LINK_TYPE
91cc1a99740e2ed Alexei Starovoitov 2019-11-14  4554  

:::::: The code at line 4550 was first introduced by commit
:::::: 4c80c7bc583a87ded5f61906f81256b57c795806 bpf: Fix build in minimal configurations, again

:::::: TO: Arnd Bergmann <arnd@...db.de>
:::::: CC: Daniel Borkmann <daniel@...earbox.net>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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