Hi Peter,

I love your patch! Yet something to improve:

[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on next-20220722]
[cannot apply to kvmarm/next arm/for-next soc/for-next xilinx-xlnx/master 
linus/master v5.19-rc7]
[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/Peter-Collingbourne/KVM-arm64-permit-MAP_SHARED-mappings-with-MTE-enabled/20220722-095300
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git 
for-next/core
config: arm64-randconfig-s032-20220721 
(https://download.01.org/0day-ci/archive/20220723/202207230959.jvdok5uk-...@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 12.1.0
reproduce:
        wget 
https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O 
~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # 
https://github.com/intel-lab-lkp/linux/commit/3323e416892d6b5326503b9afc2ee835162b819b
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review 
Peter-Collingbourne/KVM-arm64-permit-MAP_SHARED-mappings-with-MTE-enabled/20220722-095300
        git checkout 3323e416892d6b5326503b9afc2ee835162b819b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 
CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 prepare

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <l...@intel.com>

All errors (new ones prefixed by >>):

   In file included from arch/arm64/include/asm/pgtable.h:12,
                    from include/linux/pgtable.h:6,
                    from include/linux/kasan.h:33,
                    from include/linux/slab.h:140,
                    from include/linux/resource_ext.h:11,
                    from include/linux/acpi.h:14,
                    from include/acpi/apei.h:9,
                    from include/acpi/ghes.h:5,
                    from include/linux/arm_sdei.h:8,
                    from arch/arm64/kernel/asm-offsets.c:10:
>> arch/arm64/include/asm/mte.h:80:15: error: return type defaults to 'int' 
>> [-Werror=implicit-int]
      80 | static inline set_page_mte_tagged(struct page *page)
         |               ^~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
   make[2]: *** [scripts/Makefile.build:117: arch/arm64/kernel/asm-offsets.s] 
Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1200: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:219: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +/int +80 arch/arm64/include/asm/mte.h

    79  
  > 80  static inline set_page_mte_tagged(struct page *page)
    81  {
    82  }
    83  static inline bool page_mte_tagged(struct page *page)
    84  {
    85          return false;
    86  }
    87  static inline void mte_zero_clear_page_tags(void *addr)
    88  {
    89  }
    90  static inline void mte_sync_tags(pte_t old_pte, pte_t pte)
    91  {
    92  }
    93  static inline void mte_copy_page_tags(void *kto, const void *kfrom)
    94  {
    95  }
    96  static inline void mte_thread_init_user(void)
    97  {
    98  }
    99  static inline void mte_thread_switch(struct task_struct *next)
   100  {
   101  }
   102  static inline void mte_suspend_enter(void)
   103  {
   104  }
   105  static inline long set_mte_ctrl(struct task_struct *task, unsigned long 
arg)
   106  {
   107          return 0;
   108  }
   109  static inline long get_mte_ctrl(struct task_struct *task)
   110  {
   111          return 0;
   112  }
   113  static inline int mte_ptrace_copy_tags(struct task_struct *child,
   114                                         long request, unsigned long addr,
   115                                         unsigned long data)
   116  {
   117          return -EIO;
   118  }
   119  

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp
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