[linux-next:master 4227/4328] mm/vmscan.c:3184:40: sparse: sparse: incorrect type in argument 1 (different address spaces)

From: kernel test robot <lkp@intel.com>
To: Yu Zhao <yuzhao@google.com>
Cc: kbuild-all@lists.01.org,
	Linux Memory Management List <linux-mm@kvack.org>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: [linux-next:master 4227/4328] mm/vmscan.c:3184:40: sparse: sparse: incorrect type in argument 1 (different address spaces)
Date: Sat, 16 Apr 2022 08:35:32 +0800	[thread overview]
Message-ID: <202204160827.ekEARWQo-lkp@intel.com> (raw)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   40354149f4d738dc3492d9998e45b3f02950369a
commit: 32be05f0e1b84564fa4e5d1810191a198c47f87b [4227/4328] mm: multi-gen LRU: support page table walks
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20220416/202204160827.ekEARWQo-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 11.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=32be05f0e1b84564fa4e5d1810191a198c47f87b
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 32be05f0e1b84564fa4e5d1810191a198c47f87b
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=m68k SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
>> mm/vmscan.c:3184:40: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct task_struct *p @@     got struct task_struct [noderef] __rcu *owner @@
   mm/vmscan.c:3184:40: sparse:     expected struct task_struct *p
   mm/vmscan.c:3184:40: sparse:     got struct task_struct [noderef] __rcu *owner
   mm/vmscan.c:1329:28: sparse: sparse: context imbalance in '__remove_mapping' - unexpected unlock
   mm/vmscan.c:2203:33: sparse: sparse: context imbalance in 'folio_isolate_lru' - unexpected unlock
   mm/vmscan.c:2296:48: sparse: sparse: context imbalance in 'move_pages_to_lru' - unexpected unlock
   mm/vmscan.c: note: in included file (through include/linux/rculist.h, include/linux/pid.h, include/linux/sched.h, ...):
   include/linux/rcupdate.h:725:9: sparse: sparse: context imbalance in 'lru_gen_look_around' - different lock contexts for basic block
   mm/vmscan.c: note: in included file (through include/linux/swap.h):
   include/linux/memcontrol.h:1610:39: sparse: sparse: context imbalance in 'check_move_unevictable_pages' - unexpected unlock

vim +3184 mm/vmscan.c

  3171	
  3172	#ifdef CONFIG_MEMCG
  3173	void lru_gen_migrate_mm(struct mm_struct *mm)
  3174	{
  3175		struct mem_cgroup *memcg;
  3176	
  3177		lockdep_assert_held(&mm->owner->alloc_lock);
  3178	
  3179		/* for mm_update_next_owner() */
  3180		if (mem_cgroup_disabled())
  3181			return;
  3182	
  3183		rcu_read_lock();
> 3184		memcg = mem_cgroup_from_task(mm->owner);
  3185		rcu_read_unlock();
  3186		if (memcg == mm->lru_gen.memcg)
  3187			return;
  3188	
  3189		VM_BUG_ON_MM(!mm->lru_gen.memcg, mm);
  3190		VM_BUG_ON_MM(list_empty(&mm->lru_gen.list), mm);
  3191	
  3192		lru_gen_del_mm(mm);
  3193		lru_gen_add_mm(mm);
  3194	}
  3195	#endif
  3196	

-- 
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