[PATCH] arm64: mm: show direct mapping use in /proc/meminfo

[kernel test robot]

Hi Yang,

kernel test robot noticed the following build warnings:

[auto build test WARNING on arm64/for-next/core]
[also build test WARNING on linus/master v6.18-rc1 next-20251014]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Yang-Shi/arm64-mm-show-direct-mapping-use-in-proc-meminfo/20251014-075409
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
patch link:    https://lore.kernel.org/r/20251013235118.3072941-1-yang%40os.amperecomputing.com
patch subject: [PATCH] arm64: mm: show direct mapping use in /proc/meminfo
config: arm64-randconfig-002-20251015 (https://download.01.org/0day-ci/archive/20251015/202510152040.SlpMogzu-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 13.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251015/202510152040.SlpMogzu-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510152040.SlpMogzu-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/arm64/mm/mmu.c:186:6: warning: no previous prototype for 'arch_report_meminfo' [-Wmissing-prototypes]
     186 | void arch_report_meminfo(struct seq_file *m)
         |      ^~~~~~~~~~~~~~~~~~~


vim +/arch_report_meminfo +186 arch/arm64/mm/mmu.c

   185	
 > 186	void arch_report_meminfo(struct seq_file *m)
   187	{
   188		char *size[NR_DIRECT_MAP_TYPE];
   189		unsigned int shift[NR_DIRECT_MAP_TYPE];
   190	

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