Hi Poey, FYI, the error/warning still remains. tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: 36f93ff941f127f4137ab369aecbdd995fb58c66 commit: c5612e33a5de5b6ae673f25b4b36da9bf54e9ee5 [11123/20394] pwm: Add count attribute in sysfs for Intel Keem Bay config: nds32-buildonly-randconfig-r005-20220119 (https://download.01.org/0day-ci/archive/20220121/202201211634.Gsb8Nf6P-lk...) compiler: nds32le-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://github.com/intel/linux-intel-lts/commit/c5612e33a5de5b6ae673f25b4... git remote add intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-lts 5.4/yocto git checkout c5612e33a5de5b6ae673f25b4b36da9bf54e9ee5 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=nds32 SHELL=/bin/bash drivers/pwm/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from drivers/pwm/pwm-keembay.c:16: In function 'field_multiplier', inlined from 'field_mask' at include/linux/bitfield.h:111:17, inlined from 'u32_encode_bits' at include/linux/bitfield.h:140:1, inlined from 'u32_replace_bits' at include/linux/bitfield.h:140:1, inlined from 'keembay_pwm_update_bits' at drivers/pwm/pwm-keembay.c:55:9: 106 | __bad_mask(); | ^~~~~~~~~~~~ In function 'field_multiplier', inlined from 'u32_encode_bits' at include/linux/bitfield.h:140:1, inlined from 'u32_replace_bits' at include/linux/bitfield.h:140:1, inlined from 'keembay_pwm_update_bits' at drivers/pwm/pwm-keembay.c:55:9: 106 | __bad_mask(); | ^~~~~~~~~~~~ vim +/__bad_mask +106 include/linux/bitfield.h 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 43 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 44 #define __BF_FIELD_CHECK(_mask, _reg, _val, _pfx) \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 45 ({ \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 46 BUILD_BUG_ON_MSG(!__builtin_constant_p(_mask), \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 47 _pfx "mask is not constant"); \ e36488c83b6d87 Arnd Bergmann 2018-08-17 48 BUILD_BUG_ON_MSG((_mask) == 0, _pfx "mask is zero"); \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 49 BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ? \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 50 ~((_mask) >> __bf_shf(_mask)) & (_val) : 0, \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 51 _pfx "value too large for the field"); \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 52 BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 53 _pfx "type of reg too small for mask"); \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 54 __BUILD_BUG_ON_NOT_POWER_OF_2((_mask) + \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 55 (1ULL << __bf_shf(_mask))); \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 56 }) 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 57 1697599ee301a5 Jakub Kicinski 2017-02-09 58 /** 1697599ee301a5 Jakub Kicinski 2017-02-09 59 * FIELD_FIT() - check if value fits in the field 1697599ee301a5 Jakub Kicinski 2017-02-09 60 * @_mask: shifted mask defining the field's length and position 1697599ee301a5 Jakub Kicinski 2017-02-09 61 * @_val: value to test against the field 1697599ee301a5 Jakub Kicinski 2017-02-09 62 * 1697599ee301a5 Jakub Kicinski 2017-02-09 63 * Return: true if @_val can fit inside @_mask, false if @_val is too big. 1697599ee301a5 Jakub Kicinski 2017-02-09 64 */ 1697599ee301a5 Jakub Kicinski 2017-02-09 65 #define FIELD_FIT(_mask, _val) \ 1697599ee301a5 Jakub Kicinski 2017-02-09 66 ({ \ 5be9072b8121b5 Jakub Kicinski 2020-08-10 67 __BF_FIELD_CHECK(_mask, 0ULL, 0ULL, "FIELD_FIT: "); \ 1697599ee301a5 Jakub Kicinski 2017-02-09 68 !((((typeof(_mask))_val) << __bf_shf(_mask)) & ~(_mask)); \ 1697599ee301a5 Jakub Kicinski 2017-02-09 69 }) 1697599ee301a5 Jakub Kicinski 2017-02-09 70 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 71 /** 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 72 * FIELD_PREP() - prepare a bitfield element 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 73 * @_mask: shifted mask defining the field's length and position 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 74 * @_val: value to put in the field 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 75 * 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 76 * FIELD_PREP() masks and shifts up the value. The result should 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 77 * be combined with other fields of the bitfield using logical OR. 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 78 */ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 79 #define FIELD_PREP(_mask, _val) \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 80 ({ \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 81 __BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: "); \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 82 ((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask); \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 83 }) 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 84 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 85 /** 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 86 * FIELD_GET() - extract a bitfield element 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 87 * @_mask: shifted mask defining the field's length and position 7240767450d6d8 Masahiro Yamada 2017-10-03 88 * @_reg: value of entire bitfield 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 89 * 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 90 * FIELD_GET() extracts the field specified by @_mask from the 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 91 * bitfield passed in as @_reg by masking and shifting it down. 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 92 */ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 93 #define FIELD_GET(_mask, _reg) \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 94 ({ \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 95 __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 96 (typeof(_mask))(((_reg) & (_mask)) >> __bf_shf(_mask)); \ 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 97 }) 3e9b3112ec74f1 Jakub Kicinski 2016-08-31 98 e7d4a95da86e0b Johannes Berg 2018-06-20 99 extern void __compiletime_error("value doesn't fit into mask") 00b0c9b82663ac Al Viro 2017-12-14 100 __field_overflow(void); 00b0c9b82663ac Al Viro 2017-12-14 101 extern void __compiletime_error("bad bitfield mask") 00b0c9b82663ac Al Viro 2017-12-14 102 __bad_mask(void); 00b0c9b82663ac Al Viro 2017-12-14 103 static __always_inline u64 field_multiplier(u64 field) 00b0c9b82663ac Al Viro 2017-12-14 104 { 00b0c9b82663ac Al Viro 2017-12-14 105 if ((field | (field - 1)) & ((field | (field - 1)) + 1)) 00b0c9b82663ac Al Viro 2017-12-14 @106 __bad_mask(); 00b0c9b82663ac Al Viro 2017-12-14 107 return field & -field; 00b0c9b82663ac Al Viro 2017-12-14 108 } 00b0c9b82663ac Al Viro 2017-12-14 109 static __always_inline u64 field_mask(u64 field) 00b0c9b82663ac Al Viro 2017-12-14 110 { 00b0c9b82663ac Al Viro 2017-12-14 @111 return field / field_multiplier(field); 00b0c9b82663ac Al Viro 2017-12-14 112 } 00b0c9b82663ac Al Viro 2017-12-14 113 #define ____MAKE_OP(type,base,to,from) \ 00b0c9b82663ac Al Viro 2017-12-14 114 static __always_inline __##type type##_encode_bits(base v, base field) \ 00b0c9b82663ac Al Viro 2017-12-14 115 { \ e7d4a95da86e0b Johannes Berg 2018-06-20 116 if (__builtin_constant_p(v) && (v & ~field_mask(field))) \ 00b0c9b82663ac Al Viro 2017-12-14 117 __field_overflow(); \ 00b0c9b82663ac Al Viro 2017-12-14 118 return to((v & field_mask(field)) * field_multiplier(field)); \ 00b0c9b82663ac Al Viro 2017-12-14 119 } \ 00b0c9b82663ac Al Viro 2017-12-14 120 static __always_inline __##type type##_replace_bits(__##type old, \ 00b0c9b82663ac Al Viro 2017-12-14 121 base val, base field) \ 00b0c9b82663ac Al Viro 2017-12-14 122 { \ 00b0c9b82663ac Al Viro 2017-12-14 123 return (old & ~to(field)) | type##_encode_bits(val, field); \ 00b0c9b82663ac Al Viro 2017-12-14 124 } \ 00b0c9b82663ac Al Viro 2017-12-14 125 static __always_inline void type##p_replace_bits(__##type *p, \ 00b0c9b82663ac Al Viro 2017-12-14 126 base val, base field) \ 00b0c9b82663ac Al Viro 2017-12-14 127 { \ 00b0c9b82663ac Al Viro 2017-12-14 128 *p = (*p & ~to(field)) | type##_encode_bits(val, field); \ 00b0c9b82663ac Al Viro 2017-12-14 129 } \ 00b0c9b82663ac Al Viro 2017-12-14 130 static __always_inline base type##_get_bits(__##type v, base field) \ 00b0c9b82663ac Al Viro 2017-12-14 131 { \ 00b0c9b82663ac Al Viro 2017-12-14 132 return (from(v) & field)/field_multiplier(field); \ 00b0c9b82663ac Al Viro 2017-12-14 133 } 00b0c9b82663ac Al Viro 2017-12-14 134 #define __MAKE_OP(size) \ 00b0c9b82663ac Al Viro 2017-12-14 135 ____MAKE_OP(le##size,u##size,cpu_to_le##size,le##size##_to_cpu) \ 00b0c9b82663ac Al Viro 2017-12-14 136 ____MAKE_OP(be##size,u##size,cpu_to_be##size,be##size##_to_cpu) \ 00b0c9b82663ac Al Viro 2017-12-14 137 ____MAKE_OP(u##size,u##size,,) 37a3862e123826 Johannes Berg 2018-06-20 138 ____MAKE_OP(u8,u8,,) 00b0c9b82663ac Al Viro 2017-12-14 139 __MAKE_OP(16) 00b0c9b82663ac Al Viro 2017-12-14 140 __MAKE_OP(32) 00b0c9b82663ac Al Viro 2017-12-14 141 __MAKE_OP(64) 00b0c9b82663ac Al Viro 2017-12-14 142 #undef __MAKE_OP 00b0c9b82663ac Al Viro 2017-12-14 143 #undef ____MAKE_OP 00b0c9b82663ac Al Viro 2017-12-14 144 :::::: The code at line 106 was first introduced by commit :::::: 00b0c9b82663ac42e5a09f58ce960f81f29d64ee Add primitives for manipulating bitfields both in host- and fixed-endian. :::::: TO: Al Viro <viro(a)zeniv.linux.org.uk&gt; :::::: CC: Al Viro <viro(a)zeniv.linux.org.uk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org