[android-common:android15-6.6-2025-09 1/1] lib/percpu_counter.c:178:36: sparse: sparse: cast removes address space '__percpu' of expression

[android-common:android15-6.6-2025-09 1/1] lib/percpu_counter.c:178:36: sparse: sparse: cast removes address space '__percpu' of expression

[kernel test robot]

tree:   https://android.googlesource.com/kernel/common android15-6.6-2025-09
head:   b93ae26d721ce546bfc68d0bf0819a00ac746e7b
commit: c439d5e8a0deb7310b5bb4e5f2fe47c40ff5297f [1/1] pcpcntr: add group allocation/free
config: i386-randconfig-r112-20260331 (https://download.01.org/0day-ci/archive/20260331/202603312007.XjsEbKEW-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260331/202603312007.XjsEbKEW-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/202603312007.XjsEbKEW-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> lib/percpu_counter.c:178:36: sparse: sparse: cast removes address space '__percpu' of expression
>> lib/percpu_counter.c:178:33: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected signed int [noderef] [usertype] __percpu *counters @@     got void * @@
   lib/percpu_counter.c:178:33: sparse:     expected signed int [noderef] [usertype] __percpu *counters
   lib/percpu_counter.c:178:33: sparse:     got void *

vim +/__percpu +178 lib/percpu_counter.c

   153	
   154	int __percpu_counter_init_many(struct percpu_counter *fbc, s64 amount,
   155				       gfp_t gfp, u32 nr_counters,
   156				       struct lock_class_key *key)
   157	{
   158		unsigned long flags __maybe_unused;
   159		size_t counter_size;
   160		s32 __percpu *counters;
   161		u32 i;
   162	
   163		counter_size = ALIGN(sizeof(*counters), __alignof__(*counters));
   164		counters = __alloc_percpu_gfp(nr_counters * counter_size,
   165					      __alignof__(*counters), gfp);
   166		if (!counters) {
   167			fbc[0].counters = NULL;
   168			return -ENOMEM;
   169		}
   170	
   171		for (i = 0; i < nr_counters; i++) {
   172			raw_spin_lock_init(&fbc[i].lock);
   173			lockdep_set_class(&fbc[i].lock, key);
   174	#ifdef CONFIG_HOTPLUG_CPU
   175			INIT_LIST_HEAD(&fbc[i].list);
   176	#endif
   177			fbc[i].count = amount;
 > 178			fbc[i].counters = (void *)counters + (i * counter_size);
   179	
   180			debug_percpu_counter_activate(&fbc[i]);
   181		}
   182	

-- 
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