tree: git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git ti-rt-linux-5.4.y head: 39a31e930c9ef3b4f39306c49cbaa9c58c94e353 commit: 39a31e930c9ef3b4f39306c49cbaa9c58c94e353 [10/10] Merged TI feature ti_linux_base_rt into ti-rt-linux-5.4.y config: mips-randconfig-r012-20201209 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 5ff35356f1af2bb92785b38c657463924d9ec386) 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 mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu git remote add ti git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git git fetch --no-tags ti ti-rt-linux-5.4.y git checkout 39a31e930c9ef3b4f39306c49cbaa9c58c94e353 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 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 >>): void __of_phandle_cache_inv_entry(phandle handle) ^ drivers/of/base.c:151:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void __of_phandle_cache_inv_entry(phandle handle) ^ static 1 warning generated. vim +/__of_phandle_cache_inv_entry +151 drivers/of/base.c b8a9ac1a5b99a2 Frank Rowand 2018-12-18 147 5801169a2ed200 Frank Rowand 2018-12-18 148 /* 5801169a2ed200 Frank Rowand 2018-12-18 149 * Caller must hold devtree_lock. 5801169a2ed200 Frank Rowand 2018-12-18 150 */ df2caf070bea08 Rob Herring 2019-12-11 @151 void __of_phandle_cache_inv_entry(phandle handle) 5801169a2ed200 Frank Rowand 2018-12-18 152 { df2caf070bea08 Rob Herring 2019-12-11 153 u32 handle_hash; 5801169a2ed200 Frank Rowand 2018-12-18 154 struct device_node *np; 5801169a2ed200 Frank Rowand 2018-12-18 155 5801169a2ed200 Frank Rowand 2018-12-18 156 if (!handle) 5801169a2ed200 Frank Rowand 2018-12-18 157 return; 5801169a2ed200 Frank Rowand 2018-12-18 158 df2caf070bea08 Rob Herring 2019-12-11 159 handle_hash = of_phandle_cache_hash(handle); 5801169a2ed200 Frank Rowand 2018-12-18 160 df2caf070bea08 Rob Herring 2019-12-11 161 np = phandle_cache[handle_hash]; df2caf070bea08 Rob Herring 2019-12-11 162 if (np && handle == np->phandle) df2caf070bea08 Rob Herring 2019-12-11 163 phandle_cache[handle_hash] = NULL; 0b3ce78e90fc66 Frank Rowand 2018-03-04 164 } 0b3ce78e90fc66 Frank Rowand 2018-03-04 165 :::::: The code at line 151 was first introduced by commit :::::: df2caf070bea084d30ccc03b8f7fc1a2011f3e71 of: Rework and simplify phandle cache to use a fixed size :::::: TO: Rob Herring <robh(a)kernel.org&gt; :::::: CC: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org