[openeuler:openEuler-1.0-LTS 1743/1743] arch/x86/mm/cpu_entry_area.c:155:5: warning: no previous prototype for 'arch_get_kallsym'

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

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   ba07135cf74b1424e2f7f0c60e59c5b206ab320c
commit: d83212d5dd6761625fe87cc23016bbaa47303271 [1743/1743] kallsyms, x86: Export addresses of PTI entry trampolines
config: x86_64-buildonly-randconfig-2004-20250802 (https://download.01.org/0day-ci/archive/20250804/202508040829.QB64jfaH-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250804/202508040829.QB64jfaH-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/202508040829.QB64jfaH-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/x86/mm/cpu_entry_area.c:155:5: warning: no previous prototype for 'arch_get_kallsym' [-Wmissing-prototypes]
     155 | int arch_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
         |     ^~~~~~~~~~~~~~~~


vim +/arch_get_kallsym +155 arch/x86/mm/cpu_entry_area.c

   153	
   154	#ifdef CONFIG_X86_64
 > 155	int arch_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
   156			     char *name)
   157	{
   158		unsigned int cpu, ncpu = 0;
   159	
   160		if (symnum >= num_possible_cpus())
   161			return -EINVAL;
   162	
   163		for_each_possible_cpu(cpu) {
   164			if (ncpu++ >= symnum)
   165				break;
   166		}
   167	
   168		*value = (unsigned long)&get_cpu_entry_area(cpu)->entry_trampoline;
   169		*type = 't';
   170		strlcpy(name, "__entry_SYSCALL_64_trampoline", KSYM_NAME_LEN);
   171	
   172		return 0;
   173	}
   174	#endif
   175	

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