tree: https://android.googlesource.com/kernel/common android12-5.4 head: f058ed1ec2aaa13c313f42b46035a074f71920eb commit: ba5d2b9a92c5b7112f494977bd42a4c512cc6575 [13/21] UPSTREAM: vsock/vmci: register vmci_transport only when VMCI guest/host are active config: x86_64-randconfig-r001-20210309 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project cd9a69289c7825d54450cb6829fef2c8e0f1963a) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android12-5.4 git checkout ba5d2b9a92c5b7112f494977bd42a4c512cc6575 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 vmci_vsock_transport_cb(bool is_host) ^ net/vmw_vsock/vmci_transport.c:2057:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void vmci_vsock_transport_cb(bool is_host) ^ static 1 warning generated. vim +/vmci_vsock_transport_cb +2057 net/vmw_vsock/vmci_transport.c 2056 2058 { 2059 int features; 2060 2061 if (is_host) 2062 features = VSOCK_TRANSPORT_F_H2G; 2063 else 2064 features = VSOCK_TRANSPORT_F_G2H; 2065 2066 vsock_core_register(&vmci_transport, features); 2067 } 2068 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org