fs/namei.c:142:16: sparse: sparse: cast truncates bits from constant value (123456789abcdef becomes 89abcdef)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   fce2dfa773ced15f27dd27cd0b482a7473cdcf2a
commit: feb662d9168b63e1d4c02671ec96005410c6f3ce slab: support for compiler-assisted type-based slab cache partitioning
date:   9 weeks ago
config: i386-randconfig-r123-20260717 (https://download.01.org/0day-ci/archive/20260717/[email protected]/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260717/[email protected]/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
| Fixes: feb662d9168b ("slab: support for compiler-assisted type-based slab cache partitioning")
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

sparse warnings: (new ones prefixed by >>)
   fs/namei.c:159:33: sparse: sparse: undefined identifier '__builtin_infer_alloc_token'
   fs/namei.c:159:33: sparse: sparse: undefined identifier '__builtin_infer_alloc_token'
   fs/namei.c:159:33: sparse: sparse: undefined identifier '__builtin_infer_alloc_token'
   fs/namei.c:793:12: sparse: sparse: undefined identifier '__builtin_infer_alloc_token'
   fs/namei.c:793:12: sparse: sparse: undefined identifier '__builtin_infer_alloc_token'
   fs/namei.c:793:12: sparse: sparse: undefined identifier '__builtin_infer_alloc_token'
>> fs/namei.c:142:16: sparse: sparse: cast truncates bits from constant value (123456789abcdef becomes 89abcdef)
>> fs/namei.c:142:16: sparse: sparse: cast truncates bits from constant value (123456789abcdef becomes 89abcdef)
   fs/namei.c:147:25: sparse: sparse: cast truncates bits from constant value (123456789abcdef becomes 89abcdef)

vim +142 fs/namei.c

c3a3577cdb351e Al Viro       2025-11-19  139  
c3a3577cdb351e Al Viro       2025-11-19  140  static inline struct filename *alloc_filename(void)
c3a3577cdb351e Al Viro       2025-11-19  141  {
7ca83f8ebe8670 Mateusz Guzik 2025-12-01 @142  	return kmem_cache_alloc(names_cache, GFP_KERNEL);
c3a3577cdb351e Al Viro       2025-11-19  143  }
91a27b2a756784 Jeff Layton   2012-10-10  144  

:::::: The code at line 142 was first introduced by commit
:::::: 7ca83f8ebe86706c4164ac21871f4a5adb86a430 fs: hide names_cache behind runtime const machinery

:::::: TO: Mateusz Guzik <[email protected]>
:::::: CC: Al Viro <[email protected]>

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki