tree: https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git devel head: 0ecc0cdeaabd6b08ef3ec6dfaf724139031c00b8 commit: 2258e16ea4fe67f9700294b439b7aa1669aef643 [10/31] serial: make uart_console_write->putchar's character a char config: i386-randconfig-a002-20220117 (https://download.01.org/0day-ci/archive/20220119/202201190250.HH3mpoB9-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c10cbb243cafc0cf42c3e922cb29183279444432) 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 # https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git/commi... git remote add jirislaby https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git git fetch --no-tags jirislaby devel git checkout 2258e16ea4fe67f9700294b439b7aa1669aef643 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): uart_console_write(port, s, count, ulite_console_putchar); ^~~~~~~~~~~~~~~~~~~~~ include/linux/serial_core.h:402:11: note: passing argument to parameter 'putchar' here void (*putchar)(struct uart_port *, char)); ^ 1 error generated. vim +508 drivers/tty/serial/uartlite.c 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 490 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 491 static void ulite_console_write(struct console *co, const char *s, 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 492 unsigned int count) 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 493 { deeb33e8fdd834 drivers/tty/serial/uartlite.c Shubhrajyoti Datta 2018-08-06 494 struct uart_port *port = console_port; 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 495 unsigned long flags; 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 496 unsigned int ier; 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 497 int locked = 1; 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 498 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 499 if (oops_in_progress) { 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 500 locked = spin_trylock_irqsave(&port->lock, flags); 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 501 } else 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 502 spin_lock_irqsave(&port->lock, flags); 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 503 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 504 /* save and disable interrupt */ 6d53c3b71d32da drivers/tty/serial/uartlite.c Michal Simek 2013-02-11 505 ier = uart_in32(ULITE_STATUS, port) & ULITE_STATUS_IE; 6d53c3b71d32da drivers/tty/serial/uartlite.c Michal Simek 2013-02-11 506 uart_out32(0, ULITE_CONTROL, port); 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 507 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 @508 uart_console_write(port, s, count, ulite_console_putchar); 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 509 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 510 ulite_console_wait_tx(port); 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 511 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 512 /* restore interrupt state */ 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 513 if (ier) 6d53c3b71d32da drivers/tty/serial/uartlite.c Michal Simek 2013-02-11 514 uart_out32(ULITE_CONTROL_IE, ULITE_CONTROL, port); 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 515 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 516 if (locked) 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 517 spin_unlock_irqrestore(&port->lock, flags); 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 518 } 238b8721a554a3 drivers/serial/uartlite.c Peter Korsgaard 2006-12-06 519 :::::: The code at line 508 was first introduced by commit :::::: 238b8721a554a33a451a3f13bdb5be8fe5cfc927 [PATCH] serial uartlite driver :::::: TO: Peter Korsgaard <jacmet(a)sunsite.dk&gt; :::::: CC: Linus Torvalds <torvalds(a)woody.osdl.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org