[openeuler:OLK-6.6 1867/7513] mm/memcontrol.c:4061:5: sparse: sparse: symbol 'sysctl_memcg_oom_prio' was not declared. Should it be static?

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

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   1bab7be76541fb1208df75a4e4e00beb09be471f
commit: 44391f3171b05060096ff496f3507033f2460161 [1867/7513] memcg: Add sysctl memcg_qos_enable
config: arm64-randconfig-r131-20240424 (https://download.01.org/0day-ci/archive/20240424/202404240956.afcEm3Dn-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20240424/202404240956.afcEm3Dn-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/202404240956.afcEm3Dn-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> mm/memcontrol.c:4061:5: sparse: sparse: symbol 'sysctl_memcg_oom_prio' was not declared. Should it be static?
   mm/memcontrol.c:4223:50: sparse: sparse: incorrect type in argument 3 (different address spaces) @@     expected void * @@     got void [noderef] __user *buffer @@
   mm/memcontrol.c:4223:50: sparse:     expected void *
   mm/memcontrol.c:4223:50: sparse:     got void [noderef] __user *buffer
   mm/memcontrol.c:4245:35: sparse: sparse: incorrect type in initializer (incompatible argument 3 (different address spaces)) @@     expected int ( [usertype] *proc_handler )( ... ) @@     got int ( * )( ... ) @@
   mm/memcontrol.c:4245:35: sparse:     expected int ( [usertype] *proc_handler )( ... )
   mm/memcontrol.c:4245:35: sparse:     got int ( * )( ... )
   mm/memcontrol.c:4504:21: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/memcontrol.c:4504:21: sparse:    struct mem_cgroup_threshold_ary [noderef] __rcu *
   mm/memcontrol.c:4504:21: sparse:    struct mem_cgroup_threshold_ary *
   mm/memcontrol.c:4506:21: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/memcontrol.c:4506:21: sparse:    struct mem_cgroup_threshold_ary [noderef] __rcu *
   mm/memcontrol.c:4506:21: sparse:    struct mem_cgroup_threshold_ary *
   mm/memcontrol.c:4662:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/memcontrol.c:4662:9: sparse:    struct mem_cgroup_threshold_ary [noderef] __rcu *
   mm/memcontrol.c:4662:9: sparse:    struct mem_cgroup_threshold_ary *
   mm/memcontrol.c:4756:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/memcontrol.c:4756:9: sparse:    struct mem_cgroup_threshold_ary [noderef] __rcu *
   mm/memcontrol.c:4756:9: sparse:    struct mem_cgroup_threshold_ary *
   mm/memcontrol.c:6799:23: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/memcontrol.c:6799:23: sparse:    struct task_struct [noderef] __rcu *
   mm/memcontrol.c:6799:23: sparse:    struct task_struct *
   mm/memcontrol.c:7016:52: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/memcontrol.c:7016:52: sparse:    struct task_struct [noderef] __rcu *
   mm/memcontrol.c:7016:52: sparse:    struct task_struct *
   mm/memcontrol.c: note: in included file:
   include/linux/memcontrol.h:782:9: sparse: sparse: context imbalance in 'folio_lruvec_lock' - wrong count at exit
   include/linux/memcontrol.h:782:9: sparse: sparse: context imbalance in 'folio_lruvec_lock_irq' - wrong count at exit
   include/linux/memcontrol.h:782:9: sparse: sparse: context imbalance in 'folio_lruvec_lock_irqsave' - wrong count at exit
   mm/memcontrol.c:2134:6: sparse: sparse: context imbalance in 'folio_memcg_lock' - wrong count at exit
   mm/memcontrol.c:2181:17: sparse: sparse: context imbalance in '__folio_memcg_unlock' - unexpected unlock
   mm/memcontrol.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/xarray.h, ...):
   include/linux/page-flags.h:242:46: sparse: sparse: self-comparison always evaluates to false
   mm/memcontrol.c:6649:28: sparse: sparse: context imbalance in 'mem_cgroup_count_precharge_pte_range' - unexpected unlock
   mm/memcontrol.c:6844:36: sparse: sparse: context imbalance in 'mem_cgroup_move_charge_pte_range' - unexpected unlock

vim +/sysctl_memcg_oom_prio +4061 mm/memcontrol.c

  4057	
  4058	#ifdef CONFIG_MEMCG_OOM_PRIORITY
  4059	#define ENABLE_MEMCG_OOM_PROIRITY	1
  4060	#define DISABLE_MEMCG_OOM_PROIRITY	0
> 4061	int sysctl_memcg_oom_prio = DISABLE_MEMCG_OOM_PROIRITY;
  4062	

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