tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ba31f97d43be41ca99ab72a6131d7c226306865f
commit: 755db23420a1ce4b740186543432983e9bbe713e KVM: arm64: Generate final CTR_EL0 value when running in Protected mode
date:   5 months ago
config: arm64-randconfig-r024-20210814 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 1f7b25ea76a925aca690da28de9d78db7ca99d0c)
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=755db23420a1ce4b740186543432983e9bbe713e
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 755db23420a1ce4b740186543432983e9bbe713e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

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/arm64/kvm/va_layout.c:188:6: warning: no previous prototype for function 'kvm_patch_vector_branch' [-Wmissing-prototypes]
   void kvm_patch_vector_branch(struct alt_instr *alt,
        ^
   arch/arm64/kvm/va_layout.c:188:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void kvm_patch_vector_branch(struct alt_instr *alt,
   ^
   static 
   arch/arm64/kvm/va_layout.c:286:6: warning: no previous prototype for function 'kvm_get_kimage_voffset' [-Wmissing-prototypes]
   void kvm_get_kimage_voffset(struct alt_instr *alt,
        ^
   arch/arm64/kvm/va_layout.c:286:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void kvm_get_kimage_voffset(struct alt_instr *alt,
   ^
   static 
>> arch/arm64/kvm/va_layout.c:292:6: warning: no previous prototype for function 'kvm_compute_final_ctr_el0' [-Wmissing-prototypes]
   void kvm_compute_final_ctr_el0(struct alt_instr *alt,
        ^
   arch/arm64/kvm/va_layout.c:292:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void kvm_compute_final_ctr_el0(struct alt_instr *alt,
   ^
   static 
   3 warnings generated.


vim +/kvm_compute_final_ctr_el0 +292 arch/arm64/kvm/va_layout.c

   291	
 > 292	void kvm_compute_final_ctr_el0(struct alt_instr *alt,

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