[kas:lam 4/9] arch/x86/mm/tlb.c:173:4: warning: no previous prototype for function 'gen_lam'

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git lam
head:   b2e76825799b4332068b4cdf35f5758c5071a35a
commit: 17396ca74a720874aacad37ea7e1cee825160141 [4/9] x86/mm: Introduce TIF_LAM_U57 and TIF_LAM_U48
config: x86_64-randconfig-a012-20210129 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 48bdd676a1d1338c10541460bf5beb69ac17e451)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git/commit/?id=17396ca74a720874aacad37ea7e1cee825160141
        git remote add kas https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git
        git fetch --no-tags kas lam
        git checkout 17396ca74a720874aacad37ea7e1cee825160141
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> arch/x86/mm/tlb.c:173:4: warning: no previous prototype for function 'gen_lam' [-Wmissing-prototypes]
   u8 gen_lam(struct task_struct *tsk, struct mm_struct *mm)
      ^
   arch/x86/mm/tlb.c:173:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   u8 gen_lam(struct task_struct *tsk, struct mm_struct *mm)
   ^
   static 
   1 warning generated.


vim +/gen_lam +173 arch/x86/mm/tlb.c

   172	
 > 173	u8 gen_lam(struct task_struct *tsk, struct mm_struct *mm)
   174	{
   175		struct thread_info *ti = task_thread_info(tsk);
   176		if (!tsk)
   177			return LAM_NONE;
   178	
   179		if (test_ti_thread_flag(ti, TIF_LAM_U57))
   180			return LAM_U57;
   181		if (test_ti_thread_flag(ti, TIF_LAM_U48))
   182			return LAM_U48;
   183		return LAM_NONE;
   184	}
   185	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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