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Message-ID: <202510172107.6Yh2tFCb-lkp@intel.com>
Date: Fri, 17 Oct 2025 22:18:44 +0800
From: kernel test robot <lkp@...el.com>
To: Amery Hung <ameryhung@...il.com>, bpf@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
netdev@...r.kernel.org, alexei.starovoitov@...il.com,
andrii@...nel.org, daniel@...earbox.net, tj@...nel.org,
martin.lau@...nel.org, ameryhung@...il.com, kernel-team@...a.com
Subject: Re: [PATCH v2 bpf-next 2/4] bpf: Support associating BPF program
with struct_ops
Hi Amery,
kernel test robot noticed the following build warnings:
[auto build test WARNING on bpf-next/master]
url: https://github.com/intel-lab-lkp/linux/commits/Amery-Hung/bpf-Allow-verifier-to-fixup-kernel-module-kfuncs/20251017-044703
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link: https://lore.kernel.org/r/20251016204503.3203690-3-ameryhung%40gmail.com
patch subject: [PATCH v2 bpf-next 2/4] bpf: Support associating BPF program with struct_ops
config: sparc64-defconfig (https://download.01.org/0day-ci/archive/20251017/202510172107.6Yh2tFCb-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251017/202510172107.6Yh2tFCb-lkp@intel.com/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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510172107.6Yh2tFCb-lkp@intel.com/
All warnings (new ones prefixed by >>):
kernel/bpf/core.c:2881:3: error: call to undeclared function 'bpf_struct_ops_put'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
2881 | bpf_struct_ops_put(aux->st_ops_assoc);
| ^
kernel/bpf/core.c:2881:3: note: did you mean 'bpf_struct_ops_find'?
include/linux/btf.h:538:49: note: 'bpf_struct_ops_find' declared here
538 | static inline const struct bpf_struct_ops_desc *bpf_struct_ops_find(struct btf *btf, u32 type_id)
| ^
In file included from kernel/bpf/core.c:3240:
In file included from include/linux/bpf_trace.h:5:
In file included from include/trace/events/xdp.h:384:
In file included from include/trace/define_trace.h:132:
In file included from include/trace/trace_events.h:21:
In file included from include/linux/trace_events.h:6:
In file included from include/linux/ring_buffer.h:7:
>> include/linux/poll.h:134:27: warning: division by zero is undefined [-Wdivision-by-zero]
134 | M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
| ^~~~~~~~~
include/linux/poll.h:132:32: note: expanded from macro 'M'
132 | #define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/poll.h:118:51: note: expanded from macro '__MAP'
118 | (from < to ? (v & from) * (to/from) : (v & from) / (from/to))
| ^ ~~~~~~~~~
include/linux/poll.h:134:39: warning: division by zero is undefined [-Wdivision-by-zero]
134 | M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
| ^~~~~~~~~
include/linux/poll.h:132:32: note: expanded from macro 'M'
132 | #define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/poll.h:118:51: note: expanded from macro '__MAP'
118 | (from < to ? (v & from) * (to/from) : (v & from) / (from/to))
| ^ ~~~~~~~~~
include/linux/poll.h:135:12: warning: division by zero is undefined [-Wdivision-by-zero]
135 | M(HUP) | M(RDHUP) | M(MSG);
| ^~~~~~~~
include/linux/poll.h:132:32: note: expanded from macro 'M'
132 | #define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/poll.h:118:51: note: expanded from macro '__MAP'
118 | (from < to ? (v & from) * (to/from) : (v & from) / (from/to))
| ^ ~~~~~~~~~
include/linux/poll.h:135:23: warning: division by zero is undefined [-Wdivision-by-zero]
135 | M(HUP) | M(RDHUP) | M(MSG);
| ^~~~~~
include/linux/poll.h:132:32: note: expanded from macro 'M'
132 | #define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/poll.h:118:51: note: expanded from macro '__MAP'
118 | (from < to ? (v & from) * (to/from) : (v & from) / (from/to))
| ^ ~~~~~~~~~
4 warnings and 1 error generated.
vim +134 include/linux/poll.h
7a163b2195cda0c Al Viro 2018-02-01 129
7a163b2195cda0c Al Viro 2018-02-01 130 static inline __poll_t demangle_poll(u16 val)
7a163b2195cda0c Al Viro 2018-02-01 131 {
7a163b2195cda0c Al Viro 2018-02-01 132 #define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
7a163b2195cda0c Al Viro 2018-02-01 133 return M(IN) | M(OUT) | M(PRI) | M(ERR) | M(NVAL) |
7a163b2195cda0c Al Viro 2018-02-01 @134 M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
7a163b2195cda0c Al Viro 2018-02-01 135 M(HUP) | M(RDHUP) | M(MSG);
7a163b2195cda0c Al Viro 2018-02-01 136 #undef M
7a163b2195cda0c Al Viro 2018-02-01 137 }
7a163b2195cda0c Al Viro 2018-02-01 138 #undef __MAP
7a163b2195cda0c Al Viro 2018-02-01 139
7a163b2195cda0c Al Viro 2018-02-01 140
--
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https://github.com/intel/lkp-tests/wiki
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