[liam:maple_marks_v7.2 11/31] lib/maple_tree.c:528:46: sparse: sparse: cast removes address space '__rcu' of expression

[liam:maple_marks_v7.2 11/31] lib/maple_tree.c:528:46: sparse: sparse: cast removes address space '__rcu' of expression

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/liam/linux.git maple_marks_v7.2
head:   be119ad50e9c87a4a975871d84614f7c6aeaf0de
commit: ff58b13f4f7886645f07ec9b542536362d4b230c [11/31] maple_tree: Add bulk parent set helper
config: nios2-randconfig-r122-20260627 (https://download.01.org/0day-ci/archive/20260627/202606270937.VMOBGtwx-lkp@intel.com/config)
compiler: nios2-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/20260627/202606270937.VMOBGtwx-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/202606270937.VMOBGtwx-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> lib/maple_tree.c:528:46: sparse: sparse: cast removes address space '__rcu' of expression
>> lib/maple_tree.c:528:46: sparse: sparse: cast removes address space '__rcu' of expression
>> lib/maple_tree.c:528:46: sparse: sparse: cast removes address space '__rcu' of expression
>> lib/maple_tree.c:528:46: sparse: sparse: cast removes address space '__rcu' of expression
>> lib/maple_tree.c:528:46: sparse: sparse: cast removes address space '__rcu' of expression
>> lib/maple_tree.c:528:46: sparse: sparse: cast removes address space '__rcu' of expression
>> lib/maple_tree.c:528:46: sparse: sparse: cast removes address space '__rcu' of expression
>> lib/maple_tree.c:528:46: sparse: sparse: cast removes address space '__rcu' of expression
>> lib/maple_tree.c:528:46: sparse: sparse: cast removes address space '__rcu' of expression

vim +/__rcu +528 lib/maple_tree.c

   498	
   499	/*
   500	 * mas_set_parent_slots() - Bulk operation to set many slot parent pointers
   501	 * @mas: The maple state
   502	 * @parent: The encoded maple node that is the parent of @enode.
   503	 * @slot: The slot that of the @enode.
   504	 * @start_slot: The offset into @slot
   505	 * @count: The number of slots to set (eg: exclusive)
   506	 */
   507	static inline
   508	void mas_set_parent_slots(struct ma_state *mas, struct maple_enode *parent,
   509		void __rcu **slots, unsigned char start_slot, unsigned char count)
   510	{
   511		unsigned long val;
   512		unsigned long shift;
   513		unsigned long type;
   514		enum maple_type p_type = mte_node_type(parent);
   515		unsigned char i;
   516	
   517		MAS_BUG_ON(mas, p_type != maple_range_64 &&
   518				p_type != maple_arange_64);
   519	
   520		shift = MAPLE_PARENT_SLOT_SHIFT;
   521		type = MAPLE_PARENT_RANGE64;
   522	
   523		val = (unsigned long)parent;
   524		val &= ~MAPLE_NODE_MASK;
   525	
   526		for (i = 0; i < count; i++) {
   527			unsigned long pval = val | ((start_slot + i) << shift) | type;
 > 528			struct maple_enode *child = (struct maple_enode *)slots[i];
   529	
   530			mte_to_node(child)->parent = ma_parent_ptr(pval);
   531		}
   532	}
   533	

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