Hi Ajay, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: be978f8feb1d4678b941a3ccf181eea1039110e2 commit: 5625f965d7644b4dc6a71d74021cfe093ad34eea [2833/7824] wilc1000: move wilc driver out of staging config: powerpc-randconfig-r015-20200713 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 02946de3802d3bc65bc9f2eb9b8d4969b5a7add8) 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 powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu git checkout 5625f965d7644b4dc6a71d74021cfe093ad34eea # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 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 >>): static const struct wiphy_wowlan_support wowlan_support = { ^ 1 warning generated. vim +/wowlan_support +49 drivers/net/wireless/microchip/wilc1000/cfg80211.c 15162fbc78a74a5 drivers/staging/wilc1000/wilc_wfi_cfgoperations.c Arnd Bergmann 2015-11-16 48 73584a40d7484f1 drivers/staging/wilc1000/wilc_wfi_cfgoperations.c Glen Lee 2016-01-25 @49 static const struct wiphy_wowlan_support wowlan_support = { 73584a40d7484f1 drivers/staging/wilc1000/wilc_wfi_cfgoperations.c Glen Lee 2016-01-25 50 .flags = WIPHY_WOWLAN_ANY 73584a40d7484f1 drivers/staging/wilc1000/wilc_wfi_cfgoperations.c Glen Lee 2016-01-25 51 }; 73584a40d7484f1 drivers/staging/wilc1000/wilc_wfi_cfgoperations.c Glen Lee 2016-01-25 52 :::::: The code at line 49 was first introduced by commit :::::: 73584a40d7484f199a98893e97dcea8b2cbe4986 staging: wilc1000: add ops resuem/suspend/wakeup in cfg80211 :::::: TO: Glen Lee <glen.lee(a)atmel.com&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