tree: https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git devel head: d61595c5423534810c1a3c0d4a88dd2fd81d750c commit: 5726d981962bcf45daa931de98923a2aab063487 [21/33] mxser: switch to uart_driver config: i386-randconfig-a013-20211214 (https://download.01.org/0day-ci/archive/20211216/202112160704.5dKPWYFQ-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dd245bab9fbb364faa1581e4f92ba3119a872fba) 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 5726d981962bcf45daa931de98923a2aab063487 # 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 >>): kfifo_reset(&port->xmit_fifo); ^ 2 errors generated. vim +/port +826 drivers/tty/mxser.c ee7e5e66f2d4fa drivers/tty/mxser.c Jiri Slaby 2021-09-22 763 5726d981962bcf drivers/tty/mxser.c Jiri Slaby 2021-12-01 764 static int mxser_startup(struct uart_port *uport) ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 765 { 5726d981962bcf drivers/tty/mxser.c Jiri Slaby 2021-12-01 766 struct mxser_port *info = to_mport(uport); ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 767 unsigned long flags; ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 768 22d394f9712b7c drivers/tty/mxser.c Jiri Slaby 2021-12-10 769 spin_lock_irqsave(&uport->lock, flags); ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 770 e13da5a8a148c0 drivers/tty/mxser.c Jiri Slaby 2021-12-10 771 if (!uport->type) { 22d394f9712b7c drivers/tty/mxser.c Jiri Slaby 2021-12-10 772 spin_unlock_irqrestore(&uport->lock, flags); 5726d981962bcf drivers/tty/mxser.c Jiri Slaby 2021-12-01 773 return -EINVAL; ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 774 } 94c7e3efe3b70b drivers/tty/mxser.c Jiri Slaby 2021-12-15 775 5726d981962bcf drivers/tty/mxser.c Jiri Slaby 2021-12-01 776 BUG_ON("we use kfifo"); 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 777 ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 778 /* 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 779 * Clear the FIFO buffers and disable them 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 780 * (they will be reenabled in mxser_change_speed()) ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 781 */ ee7e5e66f2d4fa drivers/tty/mxser.c Jiri Slaby 2021-09-22 782 mxser_disable_and_clear_FIFO(info); 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 783 ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 784 /* 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 785 * At this point there's no way the LSR could still be 0xFF; 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 786 * if it is, then bail out, because there's likely no UART 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 787 * here. ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 788 */ ea78327711f406 drivers/tty/mxser.c Jiri Slaby 2021-12-10 789 if (inb(uport->iobase + UART_LSR) == 0xff) { 22d394f9712b7c drivers/tty/mxser.c Jiri Slaby 2021-12-10 790 spin_unlock_irqrestore(&uport->lock, flags); 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 791 return -ENODEV; 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 792 } 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 793 ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 794 /* 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 795 * Clear the interrupt registers. ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 796 */ ea78327711f406 drivers/tty/mxser.c Jiri Slaby 2021-12-10 797 (void) inb(uport->iobase + UART_LSR); ea78327711f406 drivers/tty/mxser.c Jiri Slaby 2021-12-10 798 (void) inb(uport->iobase + UART_RX); ea78327711f406 drivers/tty/mxser.c Jiri Slaby 2021-12-10 799 (void) inb(uport->iobase + UART_IIR); ea78327711f406 drivers/tty/mxser.c Jiri Slaby 2021-12-10 800 (void) inb(uport->iobase + UART_MSR); 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 801 ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 802 /* 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 803 * Now, initialize the UART ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 804 */ ea78327711f406 drivers/tty/mxser.c Jiri Slaby 2021-12-10 805 outb(UART_LCR_WLEN8, uport->iobase + UART_LCR); /* reset DLAB */ 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 806 info->MCR = UART_MCR_DTR | UART_MCR_RTS; ea78327711f406 drivers/tty/mxser.c Jiri Slaby 2021-12-10 807 outb(info->MCR, uport->iobase + UART_MCR); ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 808 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 809 /* 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 810 * Finally, enable interrupts 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 811 */ 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 812 info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 813 292955a7c011e2 drivers/tty/mxser.c Jiri Slaby 2021-06-18 814 if (info->board->must_hwid) 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 815 info->IER |= MOXA_MUST_IER_EGDAI; ea78327711f406 drivers/tty/mxser.c Jiri Slaby 2021-12-10 816 outb(info->IER, uport->iobase + UART_IER); /* enable interrupts */ ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 817 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 818 /* 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 819 * And clear the interrupt registers again for luck. 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 820 */ ea78327711f406 drivers/tty/mxser.c Jiri Slaby 2021-12-10 821 (void) inb(uport->iobase + UART_LSR); ea78327711f406 drivers/tty/mxser.c Jiri Slaby 2021-12-10 822 (void) inb(uport->iobase + UART_RX); ea78327711f406 drivers/tty/mxser.c Jiri Slaby 2021-12-10 823 (void) inb(uport->iobase + UART_IIR); ea78327711f406 drivers/tty/mxser.c Jiri Slaby 2021-12-10 824 (void) inb(uport->iobase + UART_MSR); ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 825 94c7e3efe3b70b drivers/tty/mxser.c Jiri Slaby 2021-12-15 @826 kfifo_reset(&port->xmit_fifo); 22d394f9712b7c drivers/tty/mxser.c Jiri Slaby 2021-12-10 827 spin_unlock_irqrestore(&uport->lock, flags); ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 828 1c45607ad3eb73 drivers/char/mxser.c Jiri Slaby 2008-02-07 829 return 0; ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 830 } ^1da177e4c3f41 drivers/char/mxser.c Linus Torvalds 2005-04-16 831 :::::: The code at line 826 was first introduced by commit :::::: 94c7e3efe3b70b291054ac2344013c35b314ffe6 mxser: switch from xmit_buf to kfifo :::::: TO: Jiri Slaby <jslaby(a)suse.cz&gt; :::::: CC: Jiri Slaby <jslaby(a)suse.cz&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org