Re: [PATCH 1/4] mm/swap, memcg: Introduce infrastructure for cgroup-based swap priority

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

Hi Youngjun,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 347e9f5043c89695b01e66b3ed111755afcf1911]

url:    https://github.com/intel-lab-lkp/linux/commits/Youngjun-Park/mm-swap-memcg-Introduce-infrastructure-for-cgroup-based-swap-priority/20250717-042648
base:   347e9f5043c89695b01e66b3ed111755afcf1911
patch link:    https://lore.kernel.org/r/20250716202006.3640584-2-youngjun.park%40lge.com
patch subject: [PATCH 1/4] mm/swap, memcg: Introduce infrastructure for cgroup-based swap priority
config: loongarch-randconfig-r123-20250721 (https://download.01.org/0day-ci/archive/20250721/202507212243.Lf8fSo0T-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce: (https://download.01.org/0day-ci/archive/20250721/202507212243.Lf8fSo0T-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/202507212243.Lf8fSo0T-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> mm/swap_cgroup_priority.c:115:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/swap_cgroup_priority.c:115:16: sparse:    struct swap_cgroup_priority [noderef] __rcu *
   mm/swap_cgroup_priority.c:115:16: sparse:    struct swap_cgroup_priority *
   mm/swap_cgroup_priority.c:729:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/swap_cgroup_priority.c:729:9: sparse:    struct swap_cgroup_priority [noderef] __rcu *
   mm/swap_cgroup_priority.c:729:9: sparse:    struct swap_cgroup_priority *
   mm/swap_cgroup_priority.c:638:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/swap_cgroup_priority.c:638:25: sparse:    struct swap_cgroup_priority [noderef] __rcu *
   mm/swap_cgroup_priority.c:638:25: sparse:    struct swap_cgroup_priority *

vim +115 mm/swap_cgroup_priority.c

   108	
   109	static struct swap_cgroup_priority *get_swap_cgroup_priority(
   110		struct mem_cgroup *memcg)
   111	{
   112		if (!memcg)
   113			return NULL;
   114	
 > 115		return rcu_dereference(memcg->swap_priority);
   116	}
   117	

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