mm/memcontrol.c:1439:9: sparse: sparse: context imbalance in 'lock_page_lruvec_irqsave' - wrong count at exit

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

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CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Alex Shi <alex.shi@linux.alibaba.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Linux Memory Management List <linux-mm@kvack.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   1048ba83fb1c00cd24172e23e8263972f6b5d9ac
commit: 6168d0da2b479ce25a4647de194045de1bdd1f1d mm/lru: replace pgdat lru_lock with lruvec lock
date:   7 weeks ago
:::::: branch date: 15 hours ago
:::::: commit date: 7 weeks ago
config: xtensa-randconfig-s032-20210201 (attached as .config)
compiler: xtensa-linux-gcc (GCC) 9.3.0
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: v0.6.3-215-g0fb77bb6-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6168d0da2b479ce25a4647de194045de1bdd1f1d
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 6168d0da2b479ce25a4647de194045de1bdd1f1d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=xtensa 

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/memcontrol.c:4234:21: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/memcontrol.c:4234:21: sparse:    struct mem_cgroup_threshold_ary [noderef] __rcu *
   mm/memcontrol.c:4234:21: sparse:    struct mem_cgroup_threshold_ary *
   mm/memcontrol.c:4236:21: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/memcontrol.c:4236:21: sparse:    struct mem_cgroup_threshold_ary [noderef] __rcu *
   mm/memcontrol.c:4236:21: sparse:    struct mem_cgroup_threshold_ary *
   mm/memcontrol.c:4392:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/memcontrol.c:4392:9: sparse:    struct mem_cgroup_threshold_ary [noderef] __rcu *
   mm/memcontrol.c:4392:9: sparse:    struct mem_cgroup_threshold_ary *
   mm/memcontrol.c:4486:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/memcontrol.c:4486:9: sparse:    struct mem_cgroup_threshold_ary [noderef] __rcu *
   mm/memcontrol.c:4486:9: sparse:    struct mem_cgroup_threshold_ary *
   mm/memcontrol.c:6043:23: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/memcontrol.c:6043:23: sparse:    struct task_struct [noderef] __rcu *
   mm/memcontrol.c:6043:23: sparse:    struct task_struct *
   mm/memcontrol.c:1402:15: sparse: sparse: context imbalance in 'lock_page_lruvec' - wrong count at exit
   mm/memcontrol.c: note: in included file (through include/linux/wait.h, include/linux/pid.h, include/linux/sched.h, include/linux/cgroup.h, ...):
>> include/linux/spinlock.h:379:9: sparse: sparse: context imbalance in 'lock_page_lruvec_irq' - wrong count at exit
>> mm/memcontrol.c:1439:9: sparse: sparse: context imbalance in 'lock_page_lruvec_irqsave' - wrong count at exit
   mm/memcontrol.c:2201:19: sparse: sparse: context imbalance in 'lock_page_memcg' - wrong count at exit
   include/linux/spinlock.h:409:9: sparse: sparse: context imbalance in '__unlock_page_memcg' - unexpected unlock

vim +/lock_page_lruvec_irqsave +1439 mm/memcontrol.c

6168d0da2b479c Alex Shi 2020-12-15  1431  
6168d0da2b479c Alex Shi 2020-12-15  1432  struct lruvec *lock_page_lruvec_irqsave(struct page *page, unsigned long *flags)
6168d0da2b479c Alex Shi 2020-12-15  1433  {
6168d0da2b479c Alex Shi 2020-12-15  1434  	struct lruvec *lruvec;
6168d0da2b479c Alex Shi 2020-12-15  1435  	struct pglist_data *pgdat = page_pgdat(page);
6168d0da2b479c Alex Shi 2020-12-15  1436  
6168d0da2b479c Alex Shi 2020-12-15  1437  	rcu_read_lock();
6168d0da2b479c Alex Shi 2020-12-15  1438  	lruvec = mem_cgroup_page_lruvec(page, pgdat);
6168d0da2b479c Alex Shi 2020-12-15 @1439  	spin_lock_irqsave(&lruvec->lru_lock, *flags);
6168d0da2b479c Alex Shi 2020-12-15  1440  	rcu_read_unlock();
6168d0da2b479c Alex Shi 2020-12-15  1441  
6168d0da2b479c Alex Shi 2020-12-15  1442  	lruvec_memcg_debug(lruvec, page);
6168d0da2b479c Alex Shi 2020-12-15  1443  
6168d0da2b479c Alex Shi 2020-12-15  1444  	return lruvec;
6168d0da2b479c Alex Shi 2020-12-15  1445  }
6168d0da2b479c Alex Shi 2020-12-15  1446  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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