[openeuler:OLK-6.6 2613/2613] mm/dynamic_pool.c:118:55: sparse: sparse: incorrect type in initializer (different address spaces)

[openeuler:OLK-6.6 2613/2613] mm/dynamic_pool.c:118:55: sparse: sparse: incorrect type in initializer (different address spaces)

[kernel test robot]

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   27e11e2b193b780ecfb0c4f0d0a73a0a28879c20
commit: 8822f3476adadcf84c7cb3db0d1a0a39a6fdc398 [2613/2613] mm/dynamic_pool: introduce per-memcg memory pool
config: x86_64-randconfig-r113-20250801 (https://download.01.org/0day-ci/archive/20250801/202508010611.7SCGF7vt-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250801/202508010611.7SCGF7vt-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/202508010611.7SCGF7vt-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> mm/dynamic_pool.c:118:55: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct cgroup_subsys_state *css @@     got struct cgroup_subsys_state [noderef] __rcu * @@
   mm/dynamic_pool.c:118:55: sparse:     expected struct cgroup_subsys_state *css
   mm/dynamic_pool.c:118:55: sparse:     got struct cgroup_subsys_state [noderef] __rcu *

vim +118 mm/dynamic_pool.c

   115	
   116	int dynamic_pool_destroy(struct cgroup *cgrp, bool *clear_css_online)
   117	{
 > 118		struct cgroup_subsys_state *css = cgrp->subsys[memory_cgrp_id];
   119		struct mem_cgroup *memcg = mem_cgroup_from_css(css);
   120		struct dynamic_pool *dpool;
   121		int ret = 0;
   122	
   123		if (!dpool_enabled || !memcg)
   124			return 0;
   125	
   126		mutex_lock(&dpool_mutex);
   127		dpool = dpool_get_from_memcg(memcg);
   128		if (!dpool)
   129			goto unlock;
   130	
   131		if (dpool->memcg != memcg) {
   132			memcg->dpool = NULL;
   133			goto put;
   134		}
   135	
   136		/* A offline dpool is not allowed for allocation */
   137		dpool->online = false;
   138	
   139		memcg->dpool = NULL;
   140	
   141		/* Release the initial reference count */
   142		dpool_put(dpool);
   143	
   144		/*
   145		 * Since dpool is destroyed and the memcg will be freed then,
   146		 * clear CSS_ONLINE immediately to prevent race with create.
   147		 */
   148		if (cgrp->self.flags & CSS_ONLINE) {
   149			cgrp->self.flags &= ~CSS_ONLINE;
   150			*clear_css_online = true;
   151		}
   152	
   153	put:
   154		dpool_put(dpool);
   155	unlock:
   156		mutex_unlock(&dpool_mutex);
   157	
   158		return ret;
   159	}
   160	

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