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Subject[allisonhenderson-xfs-work:pptrs_restart129 31/37] include/linux/mman.h:158:9: warning: division by zero is undefined
tree:   https://github.com/allisonhenderson/xfs_work.git pptrs_restart129
head: f0a0e96bd7e03c467041931dc1b9663111f1d365
commit: 72e3522333e0467ce3829aa51dcaaaa8e828b3ab [31/37] xfs: Add helper function xfs_attr_list_context_init
config: mips-buildonly-randconfig-r004-20211014 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6c76d0101193aa4eb891a6954ff047eda2f9cf71)
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
# install mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://github.com/allisonhenderson/xfs_work/commit/72e3522333e0467ce3829aa51dcaaaa8e828b3ab
git remote add allisonhenderson-xfs-work https://github.com/allisonhenderson/xfs_work.git
git fetch --no-tags allisonhenderson-xfs-work pptrs_restart129
git checkout 72e3522333e0467ce3829aa51dcaaaa8e828b3ab
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=mips

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

All warnings (new ones prefixed by >>):

In file included from fs/xfs/xfs_file.c:20:
fs/xfs/libxfs/xfs_attr.h:33:21: error: no member named 'larp' in 'struct xfs_globals'
return xfs_globals.larp;
~~~~~~~~~~~ ^
In file included from fs/xfs/xfs_file.c:31:
>> include/linux/mman.h:158:9: warning: division by zero is undefined [-Wdivision-by-zero]
_calc_vm_trans(flags, MAP_SYNC, VM_SYNC ) |
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/mman.h:134:48: note: expanded from macro '_calc_vm_trans'
((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \
^ ~~~~~~
>> include/linux/mman.h:158:9: warning: division by zero is undefined [-Wdivision-by-zero]
_calc_vm_trans(flags, MAP_SYNC, VM_SYNC ) |
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/mman.h:135:21: note: expanded from macro '_calc_vm_trans'
: ((x) & (bit1)) / ((bit1) / (bit2))))
^ ~~~~~~~~~~~~~~~~~
2 warnings and 1 error generated.


vim +158 include/linux/mman.h

^1da177e4c3f41 Linus Torvalds 2005-04-16 148
^1da177e4c3f41 Linus Torvalds 2005-04-16 149 /*
^1da177e4c3f41 Linus Torvalds 2005-04-16 150 * Combine the mmap "flags" argument into "vm_flags" used internally.
^1da177e4c3f41 Linus Torvalds 2005-04-16 151 */
^1da177e4c3f41 Linus Torvalds 2005-04-16 152 static inline unsigned long
^1da177e4c3f41 Linus Torvalds 2005-04-16 153 calc_vm_flag_bits(unsigned long flags)
^1da177e4c3f41 Linus Torvalds 2005-04-16 154 {
^1da177e4c3f41 Linus Torvalds 2005-04-16 155 return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) |
^1da177e4c3f41 Linus Torvalds 2005-04-16 156 _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) |
b6fb293f2497a9 Jan Kara 2017-11-01 157 _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ) |
b3fbbea4c00220 Kevin Brodsky 2019-11-25 @158 _calc_vm_trans(flags, MAP_SYNC, VM_SYNC ) |
b3fbbea4c00220 Kevin Brodsky 2019-11-25 159 arch_calc_vm_flag_bits(flags);
^1da177e4c3f41 Linus Torvalds 2005-04-16 160 }
00619bcc44d6b7 Jerome Marchand 2013-11-12 161

:::::: The code at line 158 was first introduced by commit
:::::: b3fbbea4c00220f62e6f7e2514466e6ee81f7f60 mm: Introduce arch_calc_vm_flag_bits()

:::::: TO: Kevin Brodsky <Kevin.Brodsky@arm.com>
:::::: CC: Catalin Marinas <catalin.marinas@arm.com>

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