Hi Dmitry, I love your patch! Perhaps something to improve: [auto build test WARNING on tegra/for-next] [also build test WARNING on clk/clk-next next-20200605] [cannot apply to robh/for-next tegra-drm/drm/tegra/for-next linus/master v5.7] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Dmitry-Osipenko/Introduce-memory... base: https://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux.git for-next config: arm64-randconfig-r024-20200607 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project e429cffd4f228f70c1d9df0e5d77c08590dd9766) 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 # 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 >>, old ones prefixed by <<): In file included from drivers/iommu/tegra-smmu.c:18: In file included from include/soc/tegra/mc.h:10: void icc_node_destroy(int id) ^ include/linux/interconnect-provider.h:120:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void icc_node_destroy(int id) ^ static int icc_link_destroy(struct icc_node *src, struct icc_node *dst) ^ include/linux/interconnect-provider.h:129:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int icc_link_destroy(struct icc_node *src, struct icc_node *dst) ^ static void icc_node_add(struct icc_node *node, struct icc_provider *provider) ^ include/linux/interconnect-provider.h:134:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void icc_node_add(struct icc_node *node, struct icc_provider *provider) ^ static void icc_node_del(struct icc_node *node) ^ include/linux/interconnect-provider.h:138:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void icc_node_del(struct icc_node *node) ^ static 4 warnings generated. vim +/icc_node_destroy +120 include/linux/interconnect-provider.h 11f1ceca7031de Georgi Djakov 2019-01-16 119 11f1ceca7031de Georgi Djakov 2019-01-16 @120 void icc_node_destroy(int id) 11f1ceca7031de Georgi Djakov 2019-01-16 121 { 11f1ceca7031de Georgi Djakov 2019-01-16 122 } 11f1ceca7031de Georgi Djakov 2019-01-16 123 11f1ceca7031de Georgi Djakov 2019-01-16 124 static inline int icc_link_create(struct icc_node *node, const int dst_id) 11f1ceca7031de Georgi Djakov 2019-01-16 125 { 11f1ceca7031de Georgi Djakov 2019-01-16 126 return -ENOTSUPP; 11f1ceca7031de Georgi Djakov 2019-01-16 127 } 11f1ceca7031de Georgi Djakov 2019-01-16 128 11f1ceca7031de Georgi Djakov 2019-01-16 @129 int icc_link_destroy(struct icc_node *src, struct icc_node *dst) 11f1ceca7031de Georgi Djakov 2019-01-16 130 { 11f1ceca7031de Georgi Djakov 2019-01-16 131 return -ENOTSUPP; 11f1ceca7031de Georgi Djakov 2019-01-16 132 } 11f1ceca7031de Georgi Djakov 2019-01-16 133 11f1ceca7031de Georgi Djakov 2019-01-16 @134 void icc_node_add(struct icc_node *node, struct icc_provider *provider) 11f1ceca7031de Georgi Djakov 2019-01-16 135 { 11f1ceca7031de Georgi Djakov 2019-01-16 136 } 11f1ceca7031de Georgi Djakov 2019-01-16 137 11f1ceca7031de Georgi Djakov 2019-01-16 @138 void icc_node_del(struct icc_node *node) 11f1ceca7031de Georgi Djakov 2019-01-16 139 { 11f1ceca7031de Georgi Djakov 2019-01-16 140 } 11f1ceca7031de Georgi Djakov 2019-01-16 141 :::::: The code at line 120 was first introduced by commit :::::: 11f1ceca7031deefc1a34236ab7b94360016b71d interconnect: Add generic on-chip interconnect API :::::: TO: Georgi Djakov <georgi.djakov(a)linaro.org&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org