include/linux/bitfield.h:178:3: error: call to '__field_overflow' declared with attribute error: value doesn't fit into mask

From: kernel test robot
Date: Tue Mar 18 2025 - 09:41:08 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 76b6905c11fd3c6dc4562aefc3e8c4429fefae1e
commit: ad61903add56561b72b49d717c01563cf1535781 realtek: Update the Makefile and Kconfig in the realtek folder
date: 6 months ago
config: sparc-allyesconfig (https://download.01.org/0day-ci/archive/20250318/202503182158.nkAlbJWX-lkp@xxxxxxxxx/config)
compiler: sparc64-linux-gcc (GCC) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250318/202503182158.nkAlbJWX-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503182158.nkAlbJWX-lkp@xxxxxxxxx/

All error/warnings (new ones prefixed by >>):

In file included from include/linux/mdio.h:10:0,
from drivers/net/ethernet/realtek/rtase/rtase_main.c:58:
In function 'u16_encode_bits',
inlined from 'rtase_calc_time_mitigation.constprop' at drivers/net/ethernet/realtek/rtase/rtase_main.c:1915:13,
inlined from 'rtase_init_software_variable.isra.41' at drivers/net/ethernet/realtek/rtase/rtase_main.c:1961:13,
inlined from 'rtase_init_one' at drivers/net/ethernet/realtek/rtase/rtase_main.c:2111:2:
>> include/linux/bitfield.h:178:3: error: call to '__field_overflow' declared with attribute error: value doesn't fit into mask
__field_overflow(); \
^~~~~~~~~~~~~~~~~~
include/linux/bitfield.h:198:2: note: in expansion of macro '____MAKE_OP'
____MAKE_OP(u##size,u##size,,)
^~~~~~~~~~~
include/linux/bitfield.h:200:1: note: in expansion of macro '__MAKE_OP'
__MAKE_OP(16)
^~~~~~~~~
drivers/net/ethernet/realtek/rtase/rtase_main.c: In function 'rtase_open':
>> drivers/net/ethernet/realtek/rtase/rtase_main.c:1117:52: warning: '%i' directive output may be truncated writing between 1 and 10 bytes into a region of size between 7 and 22 [-Wformat-truncation=]
snprintf(ivec->name, sizeof(ivec->name), "%s_int%i",
^~
drivers/net/ethernet/realtek/rtase/rtase_main.c:1117:45: note: directive argument in the range [0, 2147483647]
snprintf(ivec->name, sizeof(ivec->name), "%s_int%i",
^~~~~~~~~~
drivers/net/ethernet/realtek/rtase/rtase_main.c:1117:4: note: 'snprintf' output between 6 and 30 bytes into a destination of size 26
snprintf(ivec->name, sizeof(ivec->name), "%s_int%i",
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tp->dev->name, i);
~~~~~~~~~~~~~~~~~

vim +178 include/linux/bitfield.h

e2192de59e457a Johannes Berg 2023-01-18 120
e2192de59e457a Johannes Berg 2023-01-18 121 /**
e2192de59e457a Johannes Berg 2023-01-18 122 * FIELD_PREP_CONST() - prepare a constant bitfield element
e2192de59e457a Johannes Berg 2023-01-18 123 * @_mask: shifted mask defining the field's length and position
e2192de59e457a Johannes Berg 2023-01-18 124 * @_val: value to put in the field
e2192de59e457a Johannes Berg 2023-01-18 125 *
e2192de59e457a Johannes Berg 2023-01-18 126 * FIELD_PREP_CONST() masks and shifts up the value. The result should
e2192de59e457a Johannes Berg 2023-01-18 127 * be combined with other fields of the bitfield using logical OR.
e2192de59e457a Johannes Berg 2023-01-18 128 *
e2192de59e457a Johannes Berg 2023-01-18 129 * Unlike FIELD_PREP() this is a constant expression and can therefore
e2192de59e457a Johannes Berg 2023-01-18 130 * be used in initializers. Error checking is less comfortable for this
e2192de59e457a Johannes Berg 2023-01-18 131 * version, and non-constant masks cannot be used.
e2192de59e457a Johannes Berg 2023-01-18 132 */
e2192de59e457a Johannes Berg 2023-01-18 133 #define FIELD_PREP_CONST(_mask, _val) \
e2192de59e457a Johannes Berg 2023-01-18 134 ( \
e2192de59e457a Johannes Berg 2023-01-18 135 /* mask must be non-zero */ \
e2192de59e457a Johannes Berg 2023-01-18 136 BUILD_BUG_ON_ZERO((_mask) == 0) + \
e2192de59e457a Johannes Berg 2023-01-18 137 /* check if value fits */ \
e2192de59e457a Johannes Berg 2023-01-18 138 BUILD_BUG_ON_ZERO(~((_mask) >> __bf_shf(_mask)) & (_val)) + \
e2192de59e457a Johannes Berg 2023-01-18 139 /* check if mask is contiguous */ \
e2192de59e457a Johannes Berg 2023-01-18 140 __BF_CHECK_POW2((_mask) + (1ULL << __bf_shf(_mask))) + \
e2192de59e457a Johannes Berg 2023-01-18 141 /* and create the value */ \
e2192de59e457a Johannes Berg 2023-01-18 142 (((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask)) \
e2192de59e457a Johannes Berg 2023-01-18 143 )
e2192de59e457a Johannes Berg 2023-01-18 144
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 145 /**
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 146 * FIELD_GET() - extract a bitfield element
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 147 * @_mask: shifted mask defining the field's length and position
7240767450d6d8 Masahiro Yamada 2017-10-03 148 * @_reg: value of entire bitfield
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 149 *
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 150 * FIELD_GET() extracts the field specified by @_mask from the
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 151 * bitfield passed in as @_reg by masking and shifting it down.
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 152 */
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 153 #define FIELD_GET(_mask, _reg) \
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 154 ({ \
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 155 __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 156 (typeof(_mask))(((_reg) & (_mask)) >> __bf_shf(_mask)); \
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 157 })
3e9b3112ec74f1 Jakub Kicinski 2016-08-31 158
e7d4a95da86e0b Johannes Berg 2018-06-20 159 extern void __compiletime_error("value doesn't fit into mask")
00b0c9b82663ac Al Viro 2017-12-14 160 __field_overflow(void);
00b0c9b82663ac Al Viro 2017-12-14 161 extern void __compiletime_error("bad bitfield mask")
00b0c9b82663ac Al Viro 2017-12-14 162 __bad_mask(void);
00b0c9b82663ac Al Viro 2017-12-14 163 static __always_inline u64 field_multiplier(u64 field)
00b0c9b82663ac Al Viro 2017-12-14 164 {
00b0c9b82663ac Al Viro 2017-12-14 165 if ((field | (field - 1)) & ((field | (field - 1)) + 1))
00b0c9b82663ac Al Viro 2017-12-14 166 __bad_mask();
00b0c9b82663ac Al Viro 2017-12-14 167 return field & -field;
00b0c9b82663ac Al Viro 2017-12-14 168 }
00b0c9b82663ac Al Viro 2017-12-14 169 static __always_inline u64 field_mask(u64 field)
00b0c9b82663ac Al Viro 2017-12-14 170 {
00b0c9b82663ac Al Viro 2017-12-14 171 return field / field_multiplier(field);
00b0c9b82663ac Al Viro 2017-12-14 172 }
e31a50162feb35 Alex Elder 2020-03-12 173 #define field_max(field) ((typeof(field))field_mask(field))
00b0c9b82663ac Al Viro 2017-12-14 174 #define ____MAKE_OP(type,base,to,from) \
00b0c9b82663ac Al Viro 2017-12-14 175 static __always_inline __##type type##_encode_bits(base v, base field) \
00b0c9b82663ac Al Viro 2017-12-14 176 { \
e7d4a95da86e0b Johannes Berg 2018-06-20 177 if (__builtin_constant_p(v) && (v & ~field_mask(field))) \
00b0c9b82663ac Al Viro 2017-12-14 @178 __field_overflow(); \
00b0c9b82663ac Al Viro 2017-12-14 179 return to((v & field_mask(field)) * field_multiplier(field)); \
00b0c9b82663ac Al Viro 2017-12-14 180 } \
00b0c9b82663ac Al Viro 2017-12-14 181 static __always_inline __##type type##_replace_bits(__##type old, \
00b0c9b82663ac Al Viro 2017-12-14 182 base val, base field) \
00b0c9b82663ac Al Viro 2017-12-14 183 { \
00b0c9b82663ac Al Viro 2017-12-14 184 return (old & ~to(field)) | type##_encode_bits(val, field); \
00b0c9b82663ac Al Viro 2017-12-14 185 } \
00b0c9b82663ac Al Viro 2017-12-14 186 static __always_inline void type##p_replace_bits(__##type *p, \
00b0c9b82663ac Al Viro 2017-12-14 187 base val, base field) \
00b0c9b82663ac Al Viro 2017-12-14 188 { \
00b0c9b82663ac Al Viro 2017-12-14 189 *p = (*p & ~to(field)) | type##_encode_bits(val, field); \
00b0c9b82663ac Al Viro 2017-12-14 190 } \
00b0c9b82663ac Al Viro 2017-12-14 191 static __always_inline base type##_get_bits(__##type v, base field) \
00b0c9b82663ac Al Viro 2017-12-14 192 { \
00b0c9b82663ac Al Viro 2017-12-14 193 return (from(v) & field)/field_multiplier(field); \
00b0c9b82663ac Al Viro 2017-12-14 194 }
00b0c9b82663ac Al Viro 2017-12-14 195 #define __MAKE_OP(size) \
00b0c9b82663ac Al Viro 2017-12-14 196 ____MAKE_OP(le##size,u##size,cpu_to_le##size,le##size##_to_cpu) \
00b0c9b82663ac Al Viro 2017-12-14 197 ____MAKE_OP(be##size,u##size,cpu_to_be##size,be##size##_to_cpu) \
00b0c9b82663ac Al Viro 2017-12-14 198 ____MAKE_OP(u##size,u##size,,)
37a3862e123826 Johannes Berg 2018-06-20 199 ____MAKE_OP(u8,u8,,)
00b0c9b82663ac Al Viro 2017-12-14 200 __MAKE_OP(16)
00b0c9b82663ac Al Viro 2017-12-14 201 __MAKE_OP(32)
00b0c9b82663ac Al Viro 2017-12-14 202 __MAKE_OP(64)
00b0c9b82663ac Al Viro 2017-12-14 203 #undef __MAKE_OP
00b0c9b82663ac Al Viro 2017-12-14 204 #undef ____MAKE_OP
00b0c9b82663ac Al Viro 2017-12-14 205

:::::: The code at line 178 was first introduced by commit
:::::: 00b0c9b82663ac42e5a09f58ce960f81f29d64ee Add primitives for manipulating bitfields both in host- and fixed-endian.

:::::: TO: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
:::::: CC: Al Viro <viro@xxxxxxxxxxxxxxxxxx>

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https://github.com/intel/lkp-tests/wiki

Next message: Frank Scheiner: "6.1.132-rc1 build regression on ia64 (and possibly other architectures)"
Previous message: Miaoqian Lin: "[PATCH] cpufreq: pmac64: Add missing pmf_put_function() calls"
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