From: kernel test robot <lkp@intel.com>
To: Nazim Amirul <muhammad.nazim.amirul.nazle.asmade@altera.com>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
0day robot <lkp@intel.com>,
Rohan G Thomas <rohan.g.thomas@altera.com>
Subject: include/linux/bitfield.h:221:3: error: call to '__bad_mask' declared with 'error' attribute: bad bitfield mask
Date: Wed, 29 Jul 2026 09:34:41 +0200 [thread overview]
Message-ID: <202607290915.ZeI9TCug-lkp@intel.com> (raw)
tree: https://github.com/intel-lab-lkp/linux/commits/muhammad-nazim-amirul-nazle-asmade-altera-com/net-stmmac-fpe-Enforce-pmac_enabled-in-set_mm-and-keep-it-on-at-init/20260729-100008
head: 8a04b4757aed73457fdc91c3f61946a624832ba6
commit: 8a04b4757aed73457fdc91c3f61946a624832ba6 net: stmmac: fpe: Move fprq configuration to stmmac_fpe_configure_pmac()
date: 6 hours ago
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260729/202607290915.ZeI9TCug-lkp@intel.com/config)
compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260729/202607290915.ZeI9TCug-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/202607290915.ZeI9TCug-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from drivers/net/ethernet/stmicro/stmmac/stmmac_fpe.c:6:
In file included from drivers/net/ethernet/stmicro/stmmac/stmmac.h:17:
In file included from include/linux/stmmac.h:16:
In file included from include/linux/phylink.h:4:
In file included from include/linux/phy.h:20:
In file included from include/linux/mdio.h:10:
>> include/linux/bitfield.h:221:3: error: call to '__bad_mask' declared with 'error' attribute: bad bitfield mask
221 | __bad_mask();
| ^
>> include/linux/bitfield.h:221:3: error: call to '__bad_mask' declared with 'error' attribute: bad bitfield mask
2 errors generated.
vim +221 include/linux/bitfield.h
e2192de59e457a Johannes Berg 2023-01-18 142
e2192de59e457a Johannes Berg 2023-01-18 143 /**
e2192de59e457a Johannes Berg 2023-01-18 144 * FIELD_PREP_CONST() - prepare a constant bitfield element
e2192de59e457a Johannes Berg 2023-01-18 145 * @_mask: shifted mask defining the field's length and position
e2192de59e457a Johannes Berg 2023-01-18 146 * @_val: value to put in the field
e2192de59e457a Johannes Berg 2023-01-18 147 *
e2192de59e457a Johannes Berg 2023-01-18 148 * FIELD_PREP_CONST() masks and shifts up the value. The result should
e2192de59e457a Johannes Berg 2023-01-18 149 * be combined with other fields of the bitfield using logical OR.
e2192de59e457a Johannes Berg 2023-01-18 150 *
e2192de59e457a Johannes Berg 2023-01-18 151 * Unlike FIELD_PREP() this is a constant expression and can therefore
e2192de59e457a Johannes Berg 2023-01-18 152 * be used in initializers. Error checking is less comfortable for this
e2192de59e457a Johannes Berg 2023-01-18 153 * version, and non-constant masks cannot be used.
e2192de59e457a Johannes Berg 2023-01-18 154 */
e2192de59e457a Johannes Berg 2023-01-18 155 #define FIELD_PREP_CONST(_mask, _val) \
e2192de59e457a Johannes Berg 2023-01-18 156 ( \
e2192de59e457a Johannes Berg 2023-01-18 157 /* mask must be non-zero */ \
e2192de59e457a Johannes Berg 2023-01-18 158 BUILD_BUG_ON_ZERO((_mask) == 0) + \
e2192de59e457a Johannes Berg 2023-01-18 159 /* check if value fits */ \
e2192de59e457a Johannes Berg 2023-01-18 160 BUILD_BUG_ON_ZERO(~((_mask) >> __bf_shf(_mask)) & (_val)) + \
e2192de59e457a Johannes Berg 2023-01-18 161 /* check if mask is contiguous */ \
e2192de59e457a Johannes Berg 2023-01-18 162 __BF_CHECK_POW2((_mask) + (1ULL << __bf_shf(_mask))) + \
e2192de59e457a Johannes Berg 2023-01-18 163 /* and create the value */ \
e2192de59e457a Johannes Berg 2023-01-18 164 (((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask)) \
e2192de59e457a Johannes Berg 2023-01-18 165 )
e2192de59e457a Johannes Berg 2023-01-18 166
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 167 /**
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 168 * FIELD_GET() - extract a bitfield element
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 169 * @_mask: shifted mask defining the field's length and position
7240767450d6d8 Masahiro Yamada 2017-10-03 170 * @_reg: value of entire bitfield
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 171 *
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 172 * FIELD_GET() extracts the field specified by @_mask from the
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 173 * bitfield passed in as @_reg by masking and shifting it down.
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 174 */
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 175 #define FIELD_GET(_mask, _reg) \
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 176 ({ \
2a6c045640c38a Geert Uytterhoeven 2025-11-06 177 __BF_FIELD_CHECK_REG(_mask, _reg, "FIELD_GET: "); \
2a6c045640c38a Geert Uytterhoeven 2025-11-06 178 __FIELD_GET(_mask, _reg, "FIELD_GET: "); \
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 179 })
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 180
2c3f0541b99c60 Yury Norov 2026-04-27 181 /**
2c3f0541b99c60 Yury Norov 2026-04-27 182 * FIELD_GET_SIGNED() - extract a signed bitfield element
2c3f0541b99c60 Yury Norov 2026-04-27 183 * @mask: shifted mask defining the field's length and position
2c3f0541b99c60 Yury Norov 2026-04-27 184 * @reg: value of entire bitfield
2c3f0541b99c60 Yury Norov 2026-04-27 185 *
2c3f0541b99c60 Yury Norov 2026-04-27 186 * Returns the sign-extended field specified by @_mask from the
2c3f0541b99c60 Yury Norov 2026-04-27 187 * bitfield passed in as @reg by masking and shifting it down.
2c3f0541b99c60 Yury Norov 2026-04-27 188 */
2c3f0541b99c60 Yury Norov 2026-04-27 189 #define FIELD_GET_SIGNED(mask, reg) \
2c3f0541b99c60 Yury Norov 2026-04-27 190 ({ \
2c3f0541b99c60 Yury Norov 2026-04-27 191 __BF_FIELD_CHECK(mask, reg, 0U, "FIELD_GET_SIGNED: "); \
2c3f0541b99c60 Yury Norov 2026-04-27 192 ((__signed_scalar_typeof(mask)) \
2c3f0541b99c60 Yury Norov 2026-04-27 193 (((long long)(reg) << __builtin_clzll(mask)) >> \
2c3f0541b99c60 Yury Norov 2026-04-27 194 (__builtin_clzll(mask) + __builtin_ctzll(mask)))); \
2c3f0541b99c60 Yury Norov 2026-04-27 195 })
2c3f0541b99c60 Yury Norov 2026-04-27 196
a256ae22570ee4 Luo Jie 2025-04-17 197 /**
a256ae22570ee4 Luo Jie 2025-04-17 198 * FIELD_MODIFY() - modify a bitfield element
a256ae22570ee4 Luo Jie 2025-04-17 199 * @_mask: shifted mask defining the field's length and position
a256ae22570ee4 Luo Jie 2025-04-17 200 * @_reg_p: pointer to the memory that should be updated
a256ae22570ee4 Luo Jie 2025-04-17 201 * @_val: value to store in the bitfield
a256ae22570ee4 Luo Jie 2025-04-17 202 *
a256ae22570ee4 Luo Jie 2025-04-17 203 * FIELD_MODIFY() modifies the set of bits in @_reg_p specified by @_mask,
a256ae22570ee4 Luo Jie 2025-04-17 204 * by replacing them with the bitfield value passed in as @_val.
a256ae22570ee4 Luo Jie 2025-04-17 205 */
a256ae22570ee4 Luo Jie 2025-04-17 206 #define FIELD_MODIFY(_mask, _reg_p, _val) \
a256ae22570ee4 Luo Jie 2025-04-17 207 ({ \
a256ae22570ee4 Luo Jie 2025-04-17 208 typecheck_pointer(_reg_p); \
a256ae22570ee4 Luo Jie 2025-04-17 209 __BF_FIELD_CHECK(_mask, *(_reg_p), _val, "FIELD_MODIFY: "); \
a256ae22570ee4 Luo Jie 2025-04-17 210 *(_reg_p) &= ~(_mask); \
a256ae22570ee4 Luo Jie 2025-04-17 211 *(_reg_p) |= (((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask)); \
a256ae22570ee4 Luo Jie 2025-04-17 212 })
a256ae22570ee4 Luo Jie 2025-04-17 213
e7d4a95da86e0b Johannes Berg 2018-06-20 214 extern void __compiletime_error("value doesn't fit into mask")
00b0c9b82663ac Al Viro 2017-12-14 215 __field_overflow(void);
00b0c9b82663ac Al Viro 2017-12-14 216 extern void __compiletime_error("bad bitfield mask")
00b0c9b82663ac Al Viro 2017-12-14 217 __bad_mask(void);
00b0c9b82663ac Al Viro 2017-12-14 218 static __always_inline u64 field_multiplier(u64 field)
00b0c9b82663ac Al Viro 2017-12-14 219 {
00b0c9b82663ac Al Viro 2017-12-14 220 if ((field | (field - 1)) & ((field | (field - 1)) + 1))
00b0c9b82663ac Al Viro 2017-12-14 @221 __bad_mask();
00b0c9b82663ac Al Viro 2017-12-14 222 return field & -field;
00b0c9b82663ac Al Viro 2017-12-14 223 }
00b0c9b82663ac Al Viro 2017-12-14 224 static __always_inline u64 field_mask(u64 field)
00b0c9b82663ac Al Viro 2017-12-14 225 {
00b0c9b82663ac Al Viro 2017-12-14 226 return field / field_multiplier(field);
00b0c9b82663ac Al Viro 2017-12-14 227 }
e31a50162feb35 Alex Elder 2020-03-12 228 #define field_max(field) ((typeof(field))field_mask(field))
00b0c9b82663ac Al Viro 2017-12-14 229 #define ____MAKE_OP(type,base,to,from) \
e2b02d382ae0cb Ben Horgan 2025-07-09 230 static __always_inline __##type __must_check type##_encode_bits(base v, base field) \
00b0c9b82663ac Al Viro 2017-12-14 231 { \
e7d4a95da86e0b Johannes Berg 2018-06-20 232 if (__builtin_constant_p(v) && (v & ~field_mask(field))) \
00b0c9b82663ac Al Viro 2017-12-14 233 __field_overflow(); \
00b0c9b82663ac Al Viro 2017-12-14 234 return to((v & field_mask(field)) * field_multiplier(field)); \
00b0c9b82663ac Al Viro 2017-12-14 235 } \
e2b02d382ae0cb Ben Horgan 2025-07-09 236 static __always_inline __##type __must_check type##_replace_bits(__##type old, \
00b0c9b82663ac Al Viro 2017-12-14 237 base val, base field) \
00b0c9b82663ac Al Viro 2017-12-14 238 { \
00b0c9b82663ac Al Viro 2017-12-14 239 return (old & ~to(field)) | type##_encode_bits(val, field); \
00b0c9b82663ac Al Viro 2017-12-14 240 } \
00b0c9b82663ac Al Viro 2017-12-14 241 static __always_inline void type##p_replace_bits(__##type *p, \
00b0c9b82663ac Al Viro 2017-12-14 242 base val, base field) \
00b0c9b82663ac Al Viro 2017-12-14 243 { \
00b0c9b82663ac Al Viro 2017-12-14 244 *p = (*p & ~to(field)) | type##_encode_bits(val, field); \
00b0c9b82663ac Al Viro 2017-12-14 245 } \
e2b02d382ae0cb Ben Horgan 2025-07-09 246 static __always_inline base __must_check type##_get_bits(__##type v, base field) \
00b0c9b82663ac Al Viro 2017-12-14 247 { \
00b0c9b82663ac Al Viro 2017-12-14 248 return (from(v) & field)/field_multiplier(field); \
00b0c9b82663ac Al Viro 2017-12-14 249 }
00b0c9b82663ac Al Viro 2017-12-14 250 #define __MAKE_OP(size) \
00b0c9b82663ac Al Viro 2017-12-14 251 ____MAKE_OP(le##size,u##size,cpu_to_le##size,le##size##_to_cpu) \
00b0c9b82663ac Al Viro 2017-12-14 252 ____MAKE_OP(be##size,u##size,cpu_to_be##size,be##size##_to_cpu) \
00b0c9b82663ac Al Viro 2017-12-14 253 ____MAKE_OP(u##size,u##size,,)
37a3862e123826 Johannes Berg 2018-06-20 254 ____MAKE_OP(u8,u8,,)
00b0c9b82663ac Al Viro 2017-12-14 255 __MAKE_OP(16)
00b0c9b82663ac Al Viro 2017-12-14 256 __MAKE_OP(32)
00b0c9b82663ac Al Viro 2017-12-14 257 __MAKE_OP(64)
00b0c9b82663ac Al Viro 2017-12-14 258 #undef __MAKE_OP
00b0c9b82663ac Al Viro 2017-12-14 259 #undef ____MAKE_OP
00b0c9b82663ac Al Viro 2017-12-14 260
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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