tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-next head: b61c8bf4694b5115766849378dcb8787ff54e65e commit: b61c8bf4694b5115766849378dcb8787ff54e65e [218/218] tty: serial: Add UART driver for Cortina-Access platform config: alpha-randconfig-s031-20210621 (attached as .config) compiler: alpha-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git/commit/?id... git remote add tty https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git git fetch --no-tags tty tty-next git checkout b61c8bf4694b5115766849378dcb8787ff54e65e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=alpha If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/tty/serial/serial_cortina-access.c:517:28: sparse: sparse: context imbalance in 'cortina_console_write' - unexpected unlock vim +/cortina_uart_get_port +76 drivers/tty/serial/serial_cortina-access.c 74 75 /* Return uart_port pointer base on index */ 77 { 78 struct cortina_uart_port *pca_port = cortina_uart_ports; 79 80 if (index >= UART_NR) { 81 /* return 1st element if invalid index */ 82 index = 0; 83 } 84 85 pca_port += index; 86 87 return pca_port; 88 } 89 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org