[kkdwivedi:fermata 17/146] kernel/bpf/arraymap.c:827:17: sparse: sparse: non size-preserving pointer to integer cast

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/kkdwivedi/linux fermata
head:   7b45e27f0f0faaa13da429815b6143b99eaa232c
commit: a664b63f784e6d51674acc16c5ad6e1776c8ffd9 [17/146] bpf: Call the callback of bpf_for_each_map_elem with a pad
config: nios2-randconfig-r2308-20261021 (https://download.01.org/0day-ci/archive/20261021/202610210323.U5vqxig4-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 11.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261021/202610210323.U5vqxig4-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/202610210323.U5vqxig4-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> kernel/bpf/arraymap.c:827:17: sparse: sparse: non size-preserving pointer to integer cast
>> kernel/bpf/arraymap.c:827:17: sparse: sparse: non size-preserving pointer to integer cast
--
>> kernel/bpf/hashtab.c:2541:25: sparse: sparse: non size-preserving pointer to integer cast
   kernel/bpf/hashtab.c:3442:17: sparse: sparse: non size-preserving pointer to integer cast
   kernel/bpf/hashtab.c:3442:17: sparse: sparse: non size-preserving pointer to integer cast

vim +827 kernel/bpf/arraymap.c

   803	
   804	static long bpf_for_each_array_elem(struct bpf_map *map, bpf_callback_t callback_fn,
   805					    void *callback_ctx, u64 flags)
   806	{
   807		u32 i, key, num_elems = 0;
   808		struct bpf_array *array;
   809		bool is_percpu;
   810		u64 ret = 0;
   811		void *val;
   812	
   813		cant_migrate();
   814	
   815		if (flags != 0)
   816			return -EINVAL;
   817	
   818		is_percpu = map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY;
   819		array = container_of(map, struct bpf_array, map);
   820		for (i = 0; i < map->max_entries; i++) {
   821			if (is_percpu)
   822				val = this_cpu_ptr(array->pptrs[i]);
   823			else
   824				val = array_map_elem_ptr(array, i);
   825			num_elems++;
   826			key = i;
 > 827			bpf_call_cb(callback_fn, map, &key, val, callback_ctx, 0, ret, unwound);
   828			/* return value: 0 - continue, 1 - stop and return */
   829			if (ret)
   830				break;
   831		}
   832	
   833		return num_elems;
   834	
   835	unwound:
   836		/* The callback left with unwind_exit: nothing to drop here */
   837		bpf_unwind_leave();
   838		return 0;
   839	}
   840	

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