From: kernel test robot <lkp@intel.com>
To: Chao Yu <chao@kernel.org>
Cc: oe-kbuild-all@lists.linux.dev
Subject: [chao:feature/large_folio 19/19] include/linux/poll.h:134:27: warning: division by zero is undefined
Date: Wed, 28 Oct 2026 11:58:12 +0100 [thread overview]
Message-ID: <202610281148.2HVXGdtr-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git feature/large_folio
head: 5b72086892ee05798082621df69a27afeff2b233
commit: 6d9668b701d81625696253d7d736b79d7c704a13 [19/19] diff: fix patch 1
config: mips-randconfig-r2108-20261028 (https://download.01.org/0day-ci/archive/20261028/202610281148.2HVXGdtr-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261028/202610281148.2HVXGdtr-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610281148.2HVXGdtr-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from fs/f2fs/super.c:34:
fs/f2fs/f2fs.h:2303:3: error: call to undeclared function 'set_sbi_flag'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
2303 | f2fs_bug_on(F2FS_F_SB(folio), 1);
| ^
fs/f2fs/f2fs.h:38:4: note: expanded from macro 'f2fs_bug_on'
38 | set_sbi_flag(sbi, SBI_NEED_FSCK); \
| ^
In file included from fs/f2fs/super.c:42:
In file included from include/trace/events/f2fs.h:2713:
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))
| ^ ~~~~~~~~~
2 warnings and 1 error generated.
--
In file included from super.c:34:
./f2fs.h:2303:3: error: call to undeclared function 'set_sbi_flag'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
2303 | f2fs_bug_on(F2FS_F_SB(folio), 1);
| ^
./f2fs.h:38:4: note: expanded from macro 'f2fs_bug_on'
38 | set_sbi_flag(sbi, SBI_NEED_FSCK); \
| ^
In file included from super.c:42:
In file included from include/trace/events/f2fs.h:2713:
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))
| ^ ~~~~~~~~~
2 warnings and 1 error generated.
vim +134 include/linux/poll.h
7a163b2195cda0 Al Viro 2018-02-01 129
7a163b2195cda0 Al Viro 2018-02-01 130 static inline __poll_t demangle_poll(u16 val)
7a163b2195cda0 Al Viro 2018-02-01 131 {
7a163b2195cda0 Al Viro 2018-02-01 132 #define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
7a163b2195cda0 Al Viro 2018-02-01 133 return M(IN) | M(OUT) | M(PRI) | M(ERR) | M(NVAL) |
7a163b2195cda0 Al Viro 2018-02-01 @134 M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
7a163b2195cda0 Al Viro 2018-02-01 135 M(HUP) | M(RDHUP) | M(MSG);
7a163b2195cda0 Al Viro 2018-02-01 136 #undef M
7a163b2195cda0 Al Viro 2018-02-01 137 }
7a163b2195cda0 Al Viro 2018-02-01 138 #undef __MAP
7a163b2195cda0 Al Viro 2018-02-01 139
7a163b2195cda0 Al Viro 2018-02-01 140
:::::: The code at line 134 was first introduced by commit
:::::: 7a163b2195cda0cddf47b5caf14a7229d4e2bea3 unify {de,}mangle_poll(), get rid of kernel-side POLL...
:::::: TO: Al Viro <viro@zeniv.linux.org.uk>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2026-10-28 10:58 UTC|newest]
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