[opencloudos:next 46/98] kernel/sysctl.c:878:5: sparse: sparse: symbol 'proc_dointvec_max_map_count' was not declared. Should it be static?

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

tree:   https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git next
head:   a4b2dc2ffad1810ebe7a86710aa1e5cc312aa2a1
commit: 89a8f0b629af6e892fe0541ed2d10fc5dc5daefc [46/98] vm: isolate max_map_count by pid namespace
config: x86_64-randconfig-122-20240303 (https://download.01.org/0day-ci/archive/20240305/202403051536.c9DAXfh5-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240305/202403051536.c9DAXfh5-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/202403051536.c9DAXfh5-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   kernel/sysctl.c:891:47: sparse: sparse: incorrect type in argument 3 (different address spaces) @@     expected void *buffer @@     got void [noderef] __user *buffer @@
   kernel/sysctl.c:891:47: sparse:     expected void *buffer
   kernel/sysctl.c:891:47: sparse:     got void [noderef] __user *buffer
>> kernel/sysctl.c:878:5: sparse: sparse: symbol 'proc_dointvec_max_map_count' was not declared. Should it be static?
   kernel/sysctl.c:1051:45: sparse: sparse: incorrect type in argument 3 (different address spaces) @@     expected void *buffer @@     got void [noderef] __user *buffer @@
   kernel/sysctl.c:1051:45: sparse:     expected void *buffer
   kernel/sysctl.c:1051:45: sparse:     got void [noderef] __user *buffer
   kernel/sysctl.c:1809:35: sparse: sparse: incorrect type in initializer (incompatible argument 3 (different address spaces)) @@     expected int ( [usertype] *proc_handler )( ... ) @@     got int ( * )( ... ) @@
   kernel/sysctl.c:1809:35: sparse:     expected int ( [usertype] *proc_handler )( ... )
   kernel/sysctl.c:1809:35: sparse:     got int ( * )( ... )
   kernel/sysctl.c:2186:35: sparse: sparse: incorrect type in initializer (incompatible argument 3 (different address spaces)) @@     expected int ( [usertype] *proc_handler )( ... ) @@     got int ( * )( ... ) @@
   kernel/sysctl.c:2186:35: sparse:     expected int ( [usertype] *proc_handler )( ... )
   kernel/sysctl.c:2186:35: sparse:     got int ( * )( ... )
   kernel/sysctl.c:312:66: sparse: sparse: self-comparison always evaluates to false

vim +/proc_dointvec_max_map_count +878 kernel/sysctl.c

   877	
 > 878	int proc_dointvec_max_map_count(struct ctl_table *table, int write,
   879			     void __user *buffer, size_t *lenp, loff_t *ppos)
   880	{
   881	
   882		struct do_proc_dointvec_minmax_conv_param param = {
   883			.min = (int *) table->extra1,
   884			.max = (int *) table->extra2,
   885		};
   886	
   887	#ifdef CONFIG_PID_NS
   888		table->data = &task_active_pid_ns(current)->max_map_count;
   889	#endif
   890	
 > 891		return do_proc_dointvec(table, write, buffer, lenp, ppos,
   892				do_proc_dointvec_minmax_conv, &param);
   893	}
   894	

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