Hi Daniel, First bad commit (maybe != root cause): tree: git://github.com/linux-chenxing/linux.git msc313_mainlining head: df6df62e60f3a32773b02a41e0d6a4e0f2b353b5 commit: baf52d9889a05e4a516eb56f326b4e6525dc0fa8 [40/69] pinctrl: mstar: msc313 pinctrl driver config: riscv-randconfig-r002-20211120 (attached as .config) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/linux-chenxing/linux/commit/baf52d9889a05e4a516eb56f32... git remote add chenxing git://github.com/linux-chenxing/linux.git git fetch --no-tags chenxing msc313_mainlining git checkout baf52d9889a05e4a516eb56f326b4e6525dc0fa8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv 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 char * const pm_uart_groups[] = { ^ static const char * const pm_spi_groups[] = { ^ static const char * const pm_irin_groups[] = { ^ 3 warnings generated. vim +/pm_uart_groups +35 drivers/pinctrl/mstar/pinctrl-msc313-pm.c c4e1ce29f34995 Daniel Palmer 2021-01-10 34 c4e1ce29f34995 Daniel Palmer 2021-01-10 @35 static const char * const pm_uart_groups[] = { c4e1ce29f34995 Daniel Palmer 2021-01-10 36 GROUPNAME_PM_UART, c4e1ce29f34995 Daniel Palmer 2021-01-10 37 }; c4e1ce29f34995 Daniel Palmer 2021-01-10 38 c4e1ce29f34995 Daniel Palmer 2021-01-10 @39 static const char * const pm_spi_groups[] = { c4e1ce29f34995 Daniel Palmer 2021-01-10 40 GROUPNAME_PM_SPI, c4e1ce29f34995 Daniel Palmer 2021-01-10 41 }; c4e1ce29f34995 Daniel Palmer 2021-01-10 42 c4e1ce29f34995 Daniel Palmer 2021-01-10 @43 static const char * const pm_irin_groups[] = { c4e1ce29f34995 Daniel Palmer 2021-01-10 44 GROUPNAME_PM_IRIN, c4e1ce29f34995 Daniel Palmer 2021-01-10 45 }; c4e1ce29f34995 Daniel Palmer 2021-01-10 46 :::::: The code at line 35 was first introduced by commit :::::: c4e1ce29f349954fb2dbcae8047330e375dbbae1 pinctrl: mstar: msc313 pm pinctrl driver :::::: TO: Daniel Palmer <daniel(a)0x0f.com&gt; :::::: CC: Daniel Palmer <daniel(a)0x0f.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org