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Message-ID: <202505071638.ZLhUrspy-lkp@intel.com>
Date: Wed, 7 May 2025 16:38:04 +0800
From: kernel test robot <lkp@...el.com>
To: Ian Rogers <irogers@...gle.com>, Yury Norov <yury.norov@...il.com>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Arnd Bergmann <arnd@...db.de>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
Bill Wendling <morbo@...gle.com>,
Justin Stitt <justinstitt@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Jakub Kicinski <kuba@...nel.org>,
Jacob Keller <jacob.e.keller@...el.com>, linux-arch@...r.kernel.org,
linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
Leo Yan <leo.yan@....com>
Cc: oe-kbuild-all@...ts.linux.dev
Subject: Re: [PATCH v2 1/5] bitfield: Silence a clang -Wshorten-64-to-32
warning
Hi Ian,
kernel test robot noticed the following build warnings:
[auto build test WARNING on arnd-asm-generic/master]
[also build test WARNING on soc/for-next linus/master v6.15-rc5 next-20250506]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Ian-Rogers/bitfield-Silence-a-clang-Wshorten-64-to-32-warning/20250501-011830
base: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git master
patch link: https://lore.kernel.org/r/20250430171534.132774-2-irogers%40google.com
patch subject: [PATCH v2 1/5] bitfield: Silence a clang -Wshorten-64-to-32 warning
config: mips-randconfig-r111-20250501 (https://download.01.org/0day-ci/archive/20250507/202505071638.ZLhUrspy-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project f819f46284f2a79790038e1f6649172789734ae8)
reproduce: (https://download.01.org/0day-ci/archive/20250507/202505071638.ZLhUrspy-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505071638.ZLhUrspy-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
lib/bitfield_kunit.c: note: in included file (through include/linux/fortify-string.h, include/linux/string.h, include/linux/bitmap.h, ...):
>> include/linux/bitfield.h:200:1: sparse: sparse: cast to restricted __le16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast from restricted __le16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast to restricted __be16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast from restricted __be16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast to restricted __le16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast from restricted __le16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast to restricted __be16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast from restricted __be16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast to restricted __le16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast from restricted __le16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast to restricted __be16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast from restricted __be16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast to restricted __le16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast from restricted __le16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast to restricted __be16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast from restricted __be16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast to restricted __le16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast from restricted __le16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast to restricted __be16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast from restricted __be16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast to restricted __le16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast from restricted __le16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast to restricted __be16
>> include/linux/bitfield.h:200:1: sparse: sparse: cast from restricted __be16
>> include/linux/bitfield.h:201:1: sparse: sparse: cast to restricted __le32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast from restricted __le32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast to restricted __be32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast from restricted __be32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast to restricted __le32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast from restricted __le32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast to restricted __be32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast from restricted __be32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast to restricted __le32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast from restricted __le32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast to restricted __be32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast from restricted __be32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast to restricted __le32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast from restricted __le32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast to restricted __be32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast from restricted __be32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast to restricted __le32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast from restricted __le32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast to restricted __be32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast from restricted __be32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast to restricted __le32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast from restricted __le32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast to restricted __be32
>> include/linux/bitfield.h:201:1: sparse: sparse: cast from restricted __be32
>> include/linux/bitfield.h:202:1: sparse: sparse: cast to restricted __le64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast from restricted __le64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast to restricted __be64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast from restricted __be64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast to restricted __le64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast from restricted __le64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast to restricted __be64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast from restricted __be64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast to restricted __le64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast from restricted __le64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast to restricted __be64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast from restricted __be64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast to restricted __le64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast from restricted __le64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast to restricted __be64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast from restricted __be64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast to restricted __le64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast from restricted __le64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast to restricted __be64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast from restricted __be64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast to restricted __le64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast from restricted __le64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast to restricted __be64
>> include/linux/bitfield.h:202:1: sparse: sparse: cast from restricted __be64
lib/bitfield_kunit.c: note: in included file (through include/linux/thread_info.h, include/asm-generic/preempt.h, arch/mips/include/generated/asm/preempt.h, ...):
include/linux/bitops.h:274:19: sparse: sparse: cast truncates bits from constant value (8000000000000000 becomes 0)
include/linux/bitops.h:279:37: sparse: sparse: cast truncates bits from constant value (8000000000000000 becomes 0)
include/linux/bitops.h:274:19: sparse: sparse: cast truncates bits from constant value (7f00000000000000 becomes 0)
include/linux/bitops.h:279:37: sparse: sparse: cast truncates bits from constant value (7f00000000000000 becomes 0)
include/linux/bitops.h:274:19: sparse: sparse: cast truncates bits from constant value (1800000000000 becomes 0)
include/linux/bitops.h:279:37: sparse: sparse: cast truncates bits from constant value (1800000000000 becomes 0)
include/linux/bitops.h:274:19: sparse: sparse: cast truncates bits from constant value (1f8000000 becomes f8000000)
include/linux/bitops.h:279:37: sparse: sparse: cast truncates bits from constant value (1f8000000 becomes f8000000)
vim +200 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(); \
38e224b77cde3b Ian Rogers 2025-04-30 179 return to((__##type)((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
--
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