[bcachefs:bcachefs-testing 461/692] fs/bcachefs/util/darray.c:35:17: sparse: sparse: incompatible types in comparison expression (different address spaces):

[bcachefs:bcachefs-testing 461/692] fs/bcachefs/util/darray.c:35:17: sparse: sparse: incompatible types in comparison expression (different address spaces):

[kernel test robot]

tree:   https://evilpiepirate.org/git/bcachefs.git bcachefs-testing
head:   1df63c2414a8b3e8cc16e06582990371d7f38609
commit: a5c2f21bff6a883e2a0fc96e4f0127350186665e [461/692] bcachefs: move utility code to subdir
config: powerpc-randconfig-r112-20251026 (https://download.01.org/0day-ci/archive/20251027/202510270541.ivtwU7Ze-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251027/202510270541.ivtwU7Ze-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/202510270541.ivtwU7Ze-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/bcachefs/util/darray.c:35:17: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/bcachefs/util/darray.c:35:17: sparse:    char [noderef] __rcu *
   fs/bcachefs/util/darray.c:35:17: sparse:    char *

vim +35 fs/bcachefs/util/darray.c

73ab9e03861c22 fs/bcachefs/darray.c Kent Overstreet 2023-11-08   8  
68230270e04d5e fs/bcachefs/darray.c Kent Overstreet 2025-08-13   9  int __bch2_darray_resize_noprof(darray_char *d, size_t element_size, size_t new_size, gfp_t gfp,
68230270e04d5e fs/bcachefs/darray.c Kent Overstreet 2025-08-13  10  				bool rcu)
73ab9e03861c22 fs/bcachefs/darray.c Kent Overstreet 2023-11-08  11  {
73ab9e03861c22 fs/bcachefs/darray.c Kent Overstreet 2023-11-08  12  	if (new_size > d->size) {
73ab9e03861c22 fs/bcachefs/darray.c Kent Overstreet 2023-11-08  13  		new_size = roundup_pow_of_two(new_size);
73ab9e03861c22 fs/bcachefs/darray.c Kent Overstreet 2023-11-08  14  
f0d3302073e60b fs/bcachefs/darray.c Kent Overstreet 2024-10-19  15  		/*
f0d3302073e60b fs/bcachefs/darray.c Kent Overstreet 2024-10-19  16  		 * This is a workaround: kvmalloc() doesn't support > INT_MAX
f0d3302073e60b fs/bcachefs/darray.c Kent Overstreet 2024-10-19  17  		 * allocations, but vmalloc() does.
f0d3302073e60b fs/bcachefs/darray.c Kent Overstreet 2024-10-19  18  		 * The limit needs to be lifted from kvmalloc, and when it does
f0d3302073e60b fs/bcachefs/darray.c Kent Overstreet 2024-10-19  19  		 * we'll go back to just using that.
f0d3302073e60b fs/bcachefs/darray.c Kent Overstreet 2024-10-19  20  		 */
f0d3302073e60b fs/bcachefs/darray.c Kent Overstreet 2024-10-19  21  		size_t bytes;
f0d3302073e60b fs/bcachefs/darray.c Kent Overstreet 2024-10-19  22  		if (unlikely(check_mul_overflow(new_size, element_size, &bytes)))
f0d3302073e60b fs/bcachefs/darray.c Kent Overstreet 2024-10-19  23  			return -ENOMEM;
f0d3302073e60b fs/bcachefs/darray.c Kent Overstreet 2024-10-19  24  
68230270e04d5e fs/bcachefs/darray.c Kent Overstreet 2025-08-13  25  		void *old = d->data;
68230270e04d5e fs/bcachefs/darray.c Kent Overstreet 2025-08-13  26  		void *new = likely(bytes < INT_MAX)
f0d3302073e60b fs/bcachefs/darray.c Kent Overstreet 2024-10-19  27  			? kvmalloc_noprof(bytes, gfp)
f0d3302073e60b fs/bcachefs/darray.c Kent Overstreet 2024-10-19  28  			: vmalloc_noprof(bytes);
68230270e04d5e fs/bcachefs/darray.c Kent Overstreet 2025-08-13  29  		if (!new)
73ab9e03861c22 fs/bcachefs/darray.c Kent Overstreet 2023-11-08  30  			return -ENOMEM;
73ab9e03861c22 fs/bcachefs/darray.c Kent Overstreet 2023-11-08  31  
2e118ba36d56ac fs/bcachefs/darray.c Tavian Barnes   2024-06-21  32  		if (d->size)
68230270e04d5e fs/bcachefs/darray.c Kent Overstreet 2025-08-13  33  			memcpy(new, old, d->size * element_size);
68230270e04d5e fs/bcachefs/darray.c Kent Overstreet 2025-08-13  34  
68230270e04d5e fs/bcachefs/darray.c Kent Overstreet 2025-08-13 @35  		rcu_assign_pointer(d->data, new);

:::::: The code at line 35 was first introduced by commit
:::::: 68230270e04d5ebe026e89137d23bed6201bae6c bcachefs: darray_make_room_rcu()

:::::: TO: Kent Overstreet <kent.overstreet@linux.dev>
:::::: CC: Kent Overstreet <kent.overstreet@linux.dev>

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