tree: https://github.com/jpirko/linux_mlxsw jiri_devel_xmrouter head: bc7a8c3da6b90f06678e2463e283dba01dd878cd commit: 47078f0ef7270df6be962ecb32bb8a8366087027 [28/39] mlxsw: spectrum_router_xm: Introduce basic XM cache flushing config: mips-randconfig-r032-20201014 (attached as .config) compiler: mips-linux-gcc (GCC) 9.3.0 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://github.com/jpirko/linux_mlxsw/commit/47078f0ef7270df6be962ecb32bb... git remote add jpirko-mlxsw https://github.com/jpirko/linux_mlxsw git fetch --no-tags jpirko-mlxsw jiri_devel_xmrouter git checkout 47078f0ef7270df6be962ecb32bb8a8366087027 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from include/linux/bitops.h:5, from include/linux/kernel.h:12, from drivers/net/ethernet/mellanox/mlxsw/spectrum_router_xm.c:4: drivers/net/ethernet/mellanox/mlxsw/spectrum_router_xm.c: In function 'mlxsw_sp_router_xm_flush_mask4': 36 | (~UL(0) >> (BITS_PER_LONG - 1 - (h)))) | ^~ include/linux/bits.h:38:31: note: in expansion of macro '__GENMASK' 38 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) | ^~~~~~~~~ drivers/net/ethernet/mellanox/mlxsw/spectrum_router_xm.c:353:9: note: in expansion of macro 'GENMASK' 353 | return GENMASK(32, 32 - prefix_len); | ^~~~~~~ vim +36 include/linux/bits.h 295bcca84916cb5 Rikard Falkeborn 2020-04-06 33 295bcca84916cb5 Rikard Falkeborn 2020-04-06 34 #define __GENMASK(h, l) \ 95b980d62d52c4c Masahiro Yamada 2019-07-16 35 (((~UL(0)) - (UL(1) << (l)) + 1) & \ 95b980d62d52c4c Masahiro Yamada 2019-07-16 @36 (~UL(0) >> (BITS_PER_LONG - 1 - (h)))) 295bcca84916cb5 Rikard Falkeborn 2020-04-06 37 #define GENMASK(h, l) \ 295bcca84916cb5 Rikard Falkeborn 2020-04-06 38 (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) 8bd9cb51daac893 Will Deacon 2018-06-19 39 :::::: The code at line 36 was first introduced by commit :::::: 95b980d62d52c4c1768ee719e8db3efe27ef52b2 linux/bits.h: make BIT(), GENMASK(), and friends available in assembly :::::: TO: Masahiro Yamada <yamada.masahiro(a)socionext.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org