tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android13-5.15
head:   754bb029c85fb4b18d198216540f75e635dde8d4
commit: b5347f340a2b370346ce24b82dbbf6f8c0657567 [4203/5636] UPSTREAM: arm64: kasan: mte: move GCR_EL1 switch to task switch when KASAN disabled
config: arm64-buildonly-randconfig-r002-20221003
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/ammarfaizi2/linux-block/commit/b5347f340a2b370346ce24b82dbbf6f8c0657567
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android13-5.15
        git checkout b5347f340a2b370346ce24b82dbbf6f8c0657567
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/kernel/

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

Note: functions only called from assembly code should be annotated with the asmlinkage attribute
All warnings (new ones prefixed by >>):

>> arch/arm64/kernel/mte.c:197:13: warning: no previous prototype for function 'kasan_hw_tags_enable' [-Wmissing-prototypes]
   void __init kasan_hw_tags_enable(struct alt_instr *alt, __le32 *origptr,
               ^
   arch/arm64/kernel/mte.c:197:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __init kasan_hw_tags_enable(struct alt_instr *alt, __le32 *origptr,
   ^
   static 
   arch/arm64/kernel/mte.c:103:20: warning: unused function '__mte_enable_kernel' [-Wunused-function]
   static inline void __mte_enable_kernel(const char *mode, unsigned long tcf)
                      ^
   2 warnings generated.


vim +/kasan_hw_tags_enable +197 arch/arm64/kernel/mte.c

   196	
 > 197	void __init kasan_hw_tags_enable(struct alt_instr *alt, __le32 *origptr,
   198					 __le32 *updptr, int nr_inst)
   199	{
   200		BUG_ON(nr_inst != 1); /* Branch -> NOP */
   201	
   202		if (kasan_hw_tags_enabled())
   203			*updptr = cpu_to_le32(aarch64_insn_gen_nop());
   204	}
   205	

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