tree: https://github.com/intel/linux-intel-lts.git 4.19/android_r head: 968adf904a287574c10a384c2e3b1e88994ad843 commit: b88d999a5b9ae9022e12e1a5810b12b21cb77996 [18600/21556] usb: xhci: dbc: make DbC modular, introducing dbc_function structure config: x86_64-randconfig-r011-20210201 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 275c6af7d7f1ed63a03d05b4484413e447133269) 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 # https://github.com/intel/linux-intel-lts/commit/b88d999a5b9ae9022e12e1a58... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 4.19/android_r git checkout b88d999a5b9ae9022e12e1a5810b12b21cb77996 # 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 >>): In file included from drivers/usb/host/xhci-dbgcap.c:9: In file included from include/linux/dma-mapping.h:7: In file included from include/linux/device.h:16: In file included from include/linux/kobject.h:20: In file included from include/linux/sysfs.h:16: In file included from include/linux/kernfs.h:14: In file included from include/linux/idr.h:15: In file included from include/linux/radix-tree.h:27: In file included from include/linux/preempt.h:81: In file included from arch/x86/include/asm/preempt.h:7: In file included from include/linux/thread_info.h:38: In file included from arch/x86/include/asm/thread_info.h:53: arch/x86/include/asm/cpufeature.h:164:2: error: implicit declaration of function 'asm_volatile_goto' [-Werror,-Wimplicit-function-declaration] asm_volatile_goto("1: jmp 6f\n" ^ arch/x86/include/asm/cpufeature.h:195:4: error: expected ')' : : [feature] "i" (bit), ^ arch/x86/include/asm/cpufeature.h:164:19: note: to match this '(' asm_volatile_goto("1: jmp 6f\n" ^ void xhci_dbc_flush_requests(struct xhci_dbc *dbc) ^ drivers/usb/host/xhci-dbgcap.c:191:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void xhci_dbc_flush_requests(struct xhci_dbc *dbc) ^ static 1 warning and 2 errors generated. vim +/xhci_dbc_flush_requests +191 drivers/usb/host/xhci-dbgcap.c 189 190 192 { 193 xhci_dbc_flush_endpoint_requests(&dbc->eps[BULK_OUT]); 194 xhci_dbc_flush_endpoint_requests(&dbc->eps[BULK_IN]); 195 } 196 EXPORT_SYMBOL_GPL(xhci_dbc_flush_requests); 197 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org