[mark:arm64/stacktrace/arch-stack-walk 9/11] arch/arm64/kernel/time.c:49:2: error: implicit declaration of function 'arch_stack_walk'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/stacktrace/arch-stack-walk
head:   e982ef8a4c9b8bc2f92b7cdafbae70aa31b679d1
commit: 36fa81ac0d771ba0080197745a39dbe94562c615 [9/11] arm64: Make profile_pc() use arch_stack_walk()
config: arm64-randconfig-r031-20211124 (https://download.01.org/0day-ci/archive/20211125/202111250118.AIirXhgK-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 67a1c45def8a75061203461ab0060c75c864df1c)
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://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/commit/?id=36fa81ac0d771ba0080197745a39dbe94562c615
        git remote add mark https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git
        git fetch --no-tags mark arm64/stacktrace/arch-stack-walk
        git checkout 36fa81ac0d771ba0080197745a39dbe94562c615
        # save the config file to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

>> arch/arm64/kernel/time.c:49:2: error: implicit declaration of function 'arch_stack_walk' [-Werror,-Wimplicit-function-declaration]
           arch_stack_walk(profile_pc_cb, &prof_pc, current, regs);
           ^
   arch/arm64/kernel/time.c:55:13: warning: no previous prototype for function 'time_init' [-Wmissing-prototypes]
   void __init time_init(void)
               ^
   arch/arm64/kernel/time.c:55:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __init time_init(void)
   ^
   static 
   1 warning and 1 error generated.


vim +/arch_stack_walk +49 arch/arm64/kernel/time.c

    44	
    45	unsigned long profile_pc(struct pt_regs *regs)
    46	{
    47		unsigned long prof_pc = 0;
    48	
  > 49		arch_stack_walk(profile_pc_cb, &prof_pc, current, regs);
    50	
    51		return prof_pc;
    52	}
    53	EXPORT_SYMBOL(profile_pc);
    54	

---
0-DAY CI Kernel Test Service, Intel Corporation
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