[PATCH v2 1/7] arm64: mte: Fix/clarify the PG_mte_tagged semantics

[kernel test robot]

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-lkp@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 <lkp at 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	

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