Hi Suzuki, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: f3072e528ba53a76e66a34613ecc7b86dc96816d commit: 9e76624e89d2d5210d25a33749d8989212945735 [3508/3508] [v8-28-43]arm64: RME: Allow checking SVE on VM instance config: arm64-randconfig-001-20251210 (https://download.01.org/0day-ci/archive/20251210/202512100623.1pjIPxzS-lkp@i...) compiler: aarch64-linux-gcc (GCC) 14.3.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251210/202512100623.1pjIPxzS-lkp@i...) 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/202512100623.1pjIPxzS-lkp@intel.com/ All errors (new ones prefixed by >>): In file included from arch/arm64/include/asm/sysreg.h:1065, from arch/arm64/include/asm/percpu.h:13, from arch/arm64/include/asm/smp.h:28, from include/linux/smp.h:113, from include/linux/percpu.h:7, from include/linux/context_tracking_state.h:5, from include/linux/hardirq.h:5, from include/linux/kvm_host.h:7, from arch/arm64/kvm/rme.c:6: In function 'field_multiplier', inlined from 'u64_get_bits' at include/linux/bitfield.h:201:1, inlined from 'rme_has_feature' at arch/arm64/kvm/rme.c:38:11:

...

include/linux/bitfield.h:165:17: error: call to '__bad_mask' declared with attribute error: bad bitfield mask 165 | __bad_mask(); | ^~~~~~~~~~~~

vim +/__bad_mask +165 include/linux/bitfield.h e2192de59e457ae Johannes Berg 2023-01-18 119 e2192de59e457ae Johannes Berg 2023-01-18 120 /** e2192de59e457ae Johannes Berg 2023-01-18 121 * FIELD_PREP_CONST() - prepare a constant bitfield element e2192de59e457ae Johannes Berg 2023-01-18 122 * @_mask: shifted mask defining the field's length and position e2192de59e457ae Johannes Berg 2023-01-18 123 * @_val: value to put in the field e2192de59e457ae Johannes Berg 2023-01-18 124 * e2192de59e457ae Johannes Berg 2023-01-18 125 * FIELD_PREP_CONST() masks and shifts up the value. The result should e2192de59e457ae Johannes Berg 2023-01-18 126 * be combined with other fields of the bitfield using logical OR. e2192de59e457ae Johannes Berg 2023-01-18 127 * e2192de59e457ae Johannes Berg 2023-01-18 128 * Unlike FIELD_PREP() this is a constant expression and can therefore e2192de59e457ae Johannes Berg 2023-01-18 129 * be used in initializers. Error checking is less comfortable for this e2192de59e457ae Johannes Berg 2023-01-18 130 * version, and non-constant masks cannot be used. e2192de59e457ae Johannes Berg 2023-01-18 131 */ e2192de59e457ae Johannes Berg 2023-01-18 132 #define FIELD_PREP_CONST(_mask, _val) \ e2192de59e457ae Johannes Berg 2023-01-18 133 ( \ e2192de59e457ae Johannes Berg 2023-01-18 134 /* mask must be non-zero */ \ e2192de59e457ae Johannes Berg 2023-01-18 135 BUILD_BUG_ON_ZERO((_mask) == 0) + \ e2192de59e457ae Johannes Berg 2023-01-18 136 /* check if value fits */ \ e2192de59e457ae Johannes Berg 2023-01-18 137 BUILD_BUG_ON_ZERO(~((_mask) >> __bf_shf(_mask)) & (_val)) + \ e2192de59e457ae Johannes Berg 2023-01-18 138 /* check if mask is contiguous */ \ e2192de59e457ae Johannes Berg 2023-01-18 139 __BF_CHECK_POW2((_mask) + (1ULL << __bf_shf(_mask))) + \ e2192de59e457ae Johannes Berg 2023-01-18 140 /* and create the value */ \ e2192de59e457ae Johannes Berg 2023-01-18 141 (((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask)) \ e2192de59e457ae Johannes Berg 2023-01-18 142 ) e2192de59e457ae Johannes Berg 2023-01-18 143 3e9b3112ec74f19 Jakub Kicinski 2016-08-31 144 /** 3e9b3112ec74f19 Jakub Kicinski 2016-08-31 145 * FIELD_GET() - extract a bitfield element 3e9b3112ec74f19 Jakub Kicinski 2016-08-31 146 * @_mask: shifted mask defining the field's length and position 7240767450d6d83 Masahiro Yamada 2017-10-03 147 * @_reg: value of entire bitfield 3e9b3112ec74f19 Jakub Kicinski 2016-08-31 148 * 3e9b3112ec74f19 Jakub Kicinski 2016-08-31 149 * FIELD_GET() extracts the field specified by @_mask from the 3e9b3112ec74f19 Jakub Kicinski 2016-08-31 150 * bitfield passed in as @_reg by masking and shifting it down. 3e9b3112ec74f19 Jakub Kicinski 2016-08-31 151 */ 3e9b3112ec74f19 Jakub Kicinski 2016-08-31 152 #define FIELD_GET(_mask, _reg) \ 3e9b3112ec74f19 Jakub Kicinski 2016-08-31 153 ({ \ 3e9b3112ec74f19 Jakub Kicinski 2016-08-31 154 __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \ 3e9b3112ec74f19 Jakub Kicinski 2016-08-31 155 (typeof(_mask))(((_reg) & (_mask)) >> __bf_shf(_mask)); \ 3e9b3112ec74f19 Jakub Kicinski 2016-08-31 156 }) 3e9b3112ec74f19 Jakub Kicinski 2016-08-31 157 e7d4a95da86e0b0 Johannes Berg 2018-06-20 158 extern void __compiletime_error("value doesn't fit into mask") 00b0c9b82663ac4 Al Viro 2017-12-14 159 __field_overflow(void); 00b0c9b82663ac4 Al Viro 2017-12-14 160 extern void __compiletime_error("bad bitfield mask") 00b0c9b82663ac4 Al Viro 2017-12-14 161 __bad_mask(void); 00b0c9b82663ac4 Al Viro 2017-12-14 162 static __always_inline u64 field_multiplier(u64 field) 00b0c9b82663ac4 Al Viro 2017-12-14 163 { 00b0c9b82663ac4 Al Viro 2017-12-14 164 if ((field | (field - 1)) & ((field | (field - 1)) + 1)) 00b0c9b82663ac4 Al Viro 2017-12-14 @165 __bad_mask(); 00b0c9b82663ac4 Al Viro 2017-12-14 166 return field & -field; 00b0c9b82663ac4 Al Viro 2017-12-14 167 } 00b0c9b82663ac4 Al Viro 2017-12-14 168 static __always_inline u64 field_mask(u64 field) 00b0c9b82663ac4 Al Viro 2017-12-14 169 { 00b0c9b82663ac4 Al Viro 2017-12-14 170 return field / field_multiplier(field); 00b0c9b82663ac4 Al Viro 2017-12-14 171 } e31a50162feb352 Alex Elder 2020-03-12 172 #define field_max(field) ((typeof(field))field_mask(field)) 00b0c9b82663ac4 Al Viro 2017-12-14 173 #define ____MAKE_OP(type,base,to,from) \ 00b0c9b82663ac4 Al Viro 2017-12-14 174 static __always_inline __##type type##_encode_bits(base v, base field) \ 00b0c9b82663ac4 Al Viro 2017-12-14 175 { \ e7d4a95da86e0b0 Johannes Berg 2018-06-20 176 if (__builtin_constant_p(v) && (v & ~field_mask(field))) \ 00b0c9b82663ac4 Al Viro 2017-12-14 177 __field_overflow(); \ 00b0c9b82663ac4 Al Viro 2017-12-14 178 return to((v & field_mask(field)) * field_multiplier(field)); \ 00b0c9b82663ac4 Al Viro 2017-12-14 179 } \ 00b0c9b82663ac4 Al Viro 2017-12-14 180 static __always_inline __##type type##_replace_bits(__##type old, \ 00b0c9b82663ac4 Al Viro 2017-12-14 181 base val, base field) \ 00b0c9b82663ac4 Al Viro 2017-12-14 182 { \ 00b0c9b82663ac4 Al Viro 2017-12-14 183 return (old & ~to(field)) | type##_encode_bits(val, field); \ 00b0c9b82663ac4 Al Viro 2017-12-14 184 } \ 00b0c9b82663ac4 Al Viro 2017-12-14 185 static __always_inline void type##p_replace_bits(__##type *p, \ 00b0c9b82663ac4 Al Viro 2017-12-14 186 base val, base field) \ 00b0c9b82663ac4 Al Viro 2017-12-14 187 { \ 00b0c9b82663ac4 Al Viro 2017-12-14 188 *p = (*p & ~to(field)) | type##_encode_bits(val, field); \ 00b0c9b82663ac4 Al Viro 2017-12-14 189 } \ 00b0c9b82663ac4 Al Viro 2017-12-14 190 static __always_inline base type##_get_bits(__##type v, base field) \ 00b0c9b82663ac4 Al Viro 2017-12-14 191 { \ 00b0c9b82663ac4 Al Viro 2017-12-14 192 return (from(v) & field)/field_multiplier(field); \ 00b0c9b82663ac4 Al Viro 2017-12-14 193 } 00b0c9b82663ac4 Al Viro 2017-12-14 194 #define __MAKE_OP(size) \ 00b0c9b82663ac4 Al Viro 2017-12-14 195 ____MAKE_OP(le##size,u##size,cpu_to_le##size,le##size##_to_cpu) \ 00b0c9b82663ac4 Al Viro 2017-12-14 196 ____MAKE_OP(be##size,u##size,cpu_to_be##size,be##size##_to_cpu) \ 00b0c9b82663ac4 Al Viro 2017-12-14 197 ____MAKE_OP(u##size,u##size,,) 37a3862e1238262 Johannes Berg 2018-06-20 198 ____MAKE_OP(u8,u8,,) 00b0c9b82663ac4 Al Viro 2017-12-14 199 __MAKE_OP(16) 00b0c9b82663ac4 Al Viro 2017-12-14 200 __MAKE_OP(32) 00b0c9b82663ac4 Al Viro 2017-12-14 201 __MAKE_OP(64) 00b0c9b82663ac4 Al Viro 2017-12-14 202 #undef __MAKE_OP 00b0c9b82663ac4 Al Viro 2017-12-14 203 #undef ____MAKE_OP 00b0c9b82663ac4 Al Viro 2017-12-14 204 :::::: The code at line 165 was first introduced by commit :::::: 00b0c9b82663ac42e5a09f58ce960f81f29d64ee Add primitives for manipulating bitfields both in host- and fixed-endian. :::::: TO: Al Viro <viro@zeniv.linux.org.uk> :::::: CC: Al Viro <viro@zeniv.linux.org.uk> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki