[asahilinux:bits/030-misc 12/16] kernel/locking/lockdep.c:3407:49: sparse: sparse: cast truncates bits from constant value (a0000 becomes 0)

[asahilinux:bits/030-misc 12/16] kernel/locking/lockdep.c:3407:49: sparse: sparse: cast truncates bits from constant value (a0000 becomes 0)

[kernel test robot]

tree:   https://github.com/AsahiLinux/linux bits/030-misc
head:   ba55a7ab0f6380bbedb1480e837abed687c987dd
commit: 033daad0e3013ea11037cd3d33a22d082a8102f3 [12/16] Increase MAX_LOCKDEP_CHAIN_HLOCKS
config: s390-randconfig-r122-20260509 (https://download.01.org/0day-ci/archive/20260510/202605100659.Q44ovXIS-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 8.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260510/202605100659.Q44ovXIS-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/202605100659.Q44ovXIS-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> kernel/locking/lockdep.c:3407:49: sparse: sparse: cast truncates bits from constant value (a0000 becomes 0)
>> kernel/locking/lockdep.c:3407:49: sparse: sparse: cast truncates bits from constant value (a0000 becomes 0)

vim +3407 kernel/locking/lockdep.c

810507fe6fd5ff Waiman Long 2020-02-06  3399  
810507fe6fd5ff Waiman Long 2020-02-06  3400  static inline void init_chain_block(int offset, int next, int bucket, int size)
810507fe6fd5ff Waiman Long 2020-02-06  3401  {
810507fe6fd5ff Waiman Long 2020-02-06  3402  	chain_hlocks[offset] = (next >> 16) | CHAIN_BLK_FLAG;
810507fe6fd5ff Waiman Long 2020-02-06  3403  	chain_hlocks[offset + 1] = (u16)next;
810507fe6fd5ff Waiman Long 2020-02-06  3404  
810507fe6fd5ff Waiman Long 2020-02-06  3405  	if (size && !bucket) {
810507fe6fd5ff Waiman Long 2020-02-06  3406  		chain_hlocks[offset + 2] = size >> 16;
810507fe6fd5ff Waiman Long 2020-02-06 @3407  		chain_hlocks[offset + 3] = (u16)size;
810507fe6fd5ff Waiman Long 2020-02-06  3408  	}
810507fe6fd5ff Waiman Long 2020-02-06  3409  }
810507fe6fd5ff Waiman Long 2020-02-06  3410  

:::::: The code at line 3407 was first introduced by commit
:::::: 810507fe6fd5ff3de429121adff49523fabb643a locking/lockdep: Reuse freed chain_hlocks entries

:::::: TO: Waiman Long <longman@redhat.com>
:::::: CC: Ingo Molnar <mingo@kernel.org>

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