[ljs:project/cow-context 7/18] mm/cow_context.c:425:30: sparse: sparse: cast to non-scalar

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ljs/linux.git project/cow-context
head:   e02aa02fef8128743869032cb20d26f752cd9154
commit: 53591da634daa5ce534050b281052ab69defff58 [7/18] mm: add cow context write-side functionality
config: alpha-randconfig-r134-20260507 (https://download.01.org/0day-ci/archive/20260507/202605071913.7YeveUhZ-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 13.4.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260507/202605071913.7YeveUhZ-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/202605071913.7YeveUhZ-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> mm/cow_context.c:425:30: sparse: sparse: cast to non-scalar
   mm/cow_context.c:702:23: sparse: sparse: incorrect type in argument 1 (different modifiers) @@     expected struct list_head *entry @@     got struct list_head [noderef] * @@
   mm/cow_context.c:702:23: sparse:     expected struct list_head *entry
   mm/cow_context.c:702:23: sparse:     got struct list_head [noderef] *
   mm/cow_context.c:717:17: sparse: sparse: incorrect type in argument 1 (different modifiers) @@     expected struct list_head const *head @@     got struct list_head [noderef] * @@
   mm/cow_context.c:717:17: sparse:     expected struct list_head const *head
   mm/cow_context.c:717:17: sparse:     got struct list_head [noderef] *
   mm/cow_context.c:739:23: sparse: sparse: incorrect type in argument 1 (different modifiers) @@     expected struct list_head *new @@     got struct list_head [noderef] * @@
   mm/cow_context.c:739:23: sparse:     expected struct list_head *new
   mm/cow_context.c:739:23: sparse:     got struct list_head [noderef] *
   mm/cow_context.c:739:43: sparse: sparse: incorrect type in argument 2 (different modifiers) @@     expected struct list_head *head @@     got struct list_head [noderef] * @@
   mm/cow_context.c:739:43: sparse:     expected struct list_head *head
   mm/cow_context.c:739:43: sparse:     got struct list_head [noderef] *
   mm/cow_context.c:752:25: sparse: sparse: incorrect type in argument 1 (different modifiers) @@     expected struct list_head *list @@     got struct list_head [noderef] * @@
   mm/cow_context.c:752:25: sparse:     expected struct list_head *list
   mm/cow_context.c:752:25: sparse:     got struct list_head [noderef] *
   mm/cow_context.c:753:25: sparse: sparse: incorrect type in argument 1 (different modifiers) @@     expected struct list_head *list @@     got struct list_head [noderef] * @@
   mm/cow_context.c:753:25: sparse:     expected struct list_head *list
   mm/cow_context.c:753:25: sparse:     got struct list_head [noderef] *

vim +425 mm/cow_context.c

   393	
   394	/*
   395	 * Reduce the count of remaps by 1, freeing the entry in the remaps maple tree
   396	 * if reduced to zero.
   397	 *
   398	 * RCU read lock must be held.
   399	 */
   400	static void shrink_remaps(struct cow_context *context,
   401				  struct ma_state *mas_remaps, pgoff_t pgoff,
   402				  pgoff_t pgoff_last, remaps_entry_t remaps)
   403	{
   404		int nr;
   405		remaps_entry_t new_remaps;
   406		pgoff_t pgoff_next;
   407	
   408		lockdep_assert_in_rcu_read_lock();
   409	
   410		/* mmap_downgrade() makes life hard. */
   411		spin_lock(&context->concurrent_unmap_lock);
   412	
   413		nr = nr_remaps(remaps);
   414	
   415		/* If multi, simple. */
   416		if (nr > 2) {
   417			dynarray_shrink(get_multi_remaps(remaps));
   418			spin_unlock(&context->concurrent_unmap_lock);
   419			return;
   420		}
   421	
   422		if (nr == 2)
   423			new_remaps = mk_simple_remap(get_remap(remaps, 0));
   424		else /* nr == 1 */
 > 425			new_remaps = EMPTY_REMAPS_ENTRY;
   426	
   427		pgoff_next = mas_remaps->last + 1;
   428	
   429		spin_unlock(&context->concurrent_unmap_lock);
   430		/* Now we're allocating so must drop the lock. RCU readers are safe. */
   431		rcu_read_unlock();
   432		store_new_remaps_entry(mas_remaps, pgoff, pgoff_last, new_remaps);
   433		free_remaps(remaps);
   434		mas_set(mas_remaps, pgoff_next);
   435		rcu_read_lock();
   436	}
   437	

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