tree: https://android.googlesource.com/kernel/common android12-5.10 head: 04dc43bd986e351d3e20fe41ceb3d56499b7c422 commit: 82ce4a8af88d25d3f75de6e8437de3d2f049cac3 [51/57] FROMLIST: coresight: ete: Add support for ETE sysreg access config: arm64-randconfig-r001-20210414 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 6a18cc23efad410db48a3ccfc233d215de7d4cb9) 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 android12-5.10 git checkout 82ce4a8af88d25d3f75de6e8437de3d2f049cac3 # save the attached .config 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(a)intel.com&gt; All warnings (new ones prefixed by >>): u64 ete_sysreg_read(u32 offset, bool _relaxed, bool _64bit) ^ drivers/hwtracing/coresight/coresight-etm4x-core.c:118:1: note: declare 'static' if the function is not intended to be used outside of this translation unit u64 ete_sysreg_read(u32 offset, bool _relaxed, bool _64bit) ^ static void ete_sysreg_write(u64 val, u32 offset, bool _relaxed, bool _64bit) ^ drivers/hwtracing/coresight/coresight-etm4x-core.c:135:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void ete_sysreg_write(u64 val, u32 offset, bool _relaxed, bool _64bit) ^ static 2 warnings generated. vim +/ete_sysreg_read +118 drivers/hwtracing/coresight/coresight-etm4x-core.c 117 119 { 120 u64 res = 0; 121 122 switch (offset) { 123 ETE_READ_CASES(res) 124 default : 125 pr_warn_ratelimited("ete: trying to read unsupported register @%x\n", 126 offset); 127 } 128 129 if (!_relaxed) 130 __iormb(res); /* Imitate the !relaxed I/O helpers */ 131 132 return res; 133 } 134 136 { 137 if (!_relaxed) 138 __iowmb(); /* Imitate the !relaxed I/O helpers */ 139 if (!_64bit) 140 val &= GENMASK(31, 0); 141 142 switch (offset) { 143 ETE_WRITE_CASES(val) 144 default : 145 pr_warn_ratelimited("ete: trying to write to unsupported register @%x\n", 146 offset); 147 } 148 } 149 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org