[openeuler:openEuler-1.0-LTS 1740/1740] mm/mem_reliable.c:126:5: sparse: sparse: symbol 'reliable_limit_handler' was not declared. Should it be static?

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

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   e98deea13d81cacd6479edf0de6267118ae7c639
commit: 1845e7add95773a24019fb72bbea24a0a568663b [1740/1740] mm: Add reliable memory use limit for user tasks
config: arm64-randconfig-r121-20250729 (https://download.01.org/0day-ci/archive/20251018/202510181808.04lWorDM-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251018/202510181808.04lWorDM-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/202510181808.04lWorDM-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> mm/mem_reliable.c:126:5: sparse: sparse: symbol 'reliable_limit_handler' was not declared. Should it be static?
   mm/mem_reliable.c:126:5: warning: no previous prototype for 'reliable_limit_handler' [-Wmissing-prototypes]
     126 | int reliable_limit_handler(struct ctl_table *table, int write,
         |     ^~~~~~~~~~~~~~~~~~~~~~

vim +/reliable_limit_handler +126 mm/mem_reliable.c

   124	
   125	#ifdef CONFIG_SYSCTL
 > 126	int reliable_limit_handler(struct ctl_table *table, int write,
   127		void __user *buffer, size_t *length, loff_t *ppos)
   128	{
   129		unsigned long old = task_reliable_limit;
   130		int ret;
   131	
   132		ret = proc_doulongvec_minmax(table, write, buffer, length, ppos);
   133		if (ret == 0 && write) {
   134			if (task_reliable_limit > total_reliable_mem_sz()) {
   135				task_reliable_limit = old;
   136				return -EINVAL;
   137			}
   138		}
   139	
   140		return ret;
   141	}
   142	

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