tree: https://android.googlesource.com/kernel/common android13-5.10 head: 663bbfa2a48a042ef172114830ccf6ad1a16677c commit: bdc7abb880337dc68bd400d3a69df9d61275e402 [7/51] UPSTREAM: arm64: kexec: move relocation function setup config: arm64-randconfig-r003-20210713 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe) 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 git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android13-5.10 git checkout bdc7abb880337dc68bd400d3a69df9d61275e402 # 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(a)intel.com&gt; All warnings (new ones prefixed by >>): int machine_kexec_post_load(struct kimage *kimage) ^ arch/arm64/kernel/machine_kexec.c:62:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int machine_kexec_post_load(struct kimage *kimage) ^ static arch/arm64/kernel/machine_kexec.c:238:6: warning: no previous prototype for function 'machine_crash_shutdown' [-Wmissing-prototypes] void machine_crash_shutdown(struct pt_regs *regs) ^ arch/arm64/kernel/machine_kexec.c:238:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void machine_crash_shutdown(struct pt_regs *regs) ^ static 2 warnings generated. vim +/machine_kexec_post_load +62 arch/arm64/kernel/machine_kexec.c 61 63 { 64 void *reloc_code = page_to_virt(kimage->control_code_page); 65 66 memcpy(reloc_code, arm64_relocate_new_kernel, 67 arm64_relocate_new_kernel_size); 68 kimage->arch.kern_reloc = __pa(reloc_code); 69 70 /* Flush the reloc_code in preparation for its execution. */ 71 __flush_dcache_area(reloc_code, arm64_relocate_new_kernel_size); 72 flush_icache_range((uintptr_t)reloc_code, (uintptr_t)reloc_code + 73 arm64_relocate_new_kernel_size); 74 75 return 0; 76 } 77 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org