tree: https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git devel head: d61595c5423534810c1a3c0d4a88dd2fd81d750c commit: 8825023d7d2eb9e5dc298ad1996a0c753b2c4580 [8/33] tty: add kfifo to tty_port config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20211215/202112152217.TA9FNAE3-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # 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 8825023d7d2eb9e5dc298ad1996a0c753b2c4580 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash drivers/tty/ 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 >>): drivers/tty/tty_port.c: In function 'tty_port_alloc_xmit_buf': 228 | if (port->xmit_buf == NULL) | ^~ In file included from include/linux/tty.h:12, from drivers/tty/tty_port.c:8: include/linux/tty_port.h:115:18: note: declared here 115 | unsigned char *xmit_buf __attribute__((deprecated)); | ^~~~~~~~ drivers/tty/tty_port.c:229:3: warning: 'xmit_buf' is deprecated [-Wdeprecated-declarations] 229 | port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL); | ^~~~ In file included from include/linux/tty.h:12, from drivers/tty/tty_port.c:8: include/linux/tty_port.h:115:18: note: declared here 115 | unsigned char *xmit_buf __attribute__((deprecated)); | ^~~~~~~~ drivers/tty/tty_port.c:231:2: warning: 'xmit_buf' is deprecated [-Wdeprecated-declarations] 231 | if (port->xmit_buf == NULL) | ^~ In file included from include/linux/tty.h:12, from drivers/tty/tty_port.c:8: include/linux/tty_port.h:115:18: note: declared here 115 | unsigned char *xmit_buf __attribute__((deprecated)); | ^~~~~~~~ drivers/tty/tty_port.c: In function 'tty_port_free_xmit_buf': drivers/tty/tty_port.c:240:2: warning: 'xmit_buf' is deprecated [-Wdeprecated-declarations] 240 | if (port->xmit_buf != NULL) { | ^~ In file included from include/linux/tty.h:12, from drivers/tty/tty_port.c:8: include/linux/tty_port.h:115:18: note: declared here 115 | unsigned char *xmit_buf __attribute__((deprecated)); | ^~~~~~~~ drivers/tty/tty_port.c:241:3: warning: 'xmit_buf' is deprecated [-Wdeprecated-declarations] 241 | free_page((unsigned long)port->xmit_buf); | ^~~~~~~~~ In file included from include/linux/tty.h:12, from drivers/tty/tty_port.c:8: include/linux/tty_port.h:115:18: note: declared here 115 | unsigned char *xmit_buf __attribute__((deprecated)); | ^~~~~~~~ drivers/tty/tty_port.c:242:3: warning: 'xmit_buf' is deprecated [-Wdeprecated-declarations] 242 | port->xmit_buf = NULL; | ^~~~ In file included from include/linux/tty.h:12, from drivers/tty/tty_port.c:8: include/linux/tty_port.h:115:18: note: declared here 115 | unsigned char *xmit_buf __attribute__((deprecated)); | ^~~~~~~~ drivers/tty/tty_port.c: In function 'tty_port_destructor': drivers/tty/tty_port.c:270:2: warning: 'xmit_buf' is deprecated [-Wdeprecated-declarations] 270 | if (port->xmit_buf) | ^~ In file included from include/linux/tty.h:12, from drivers/tty/tty_port.c:8: include/linux/tty_port.h:115:18: note: declared here 115 | unsigned char *xmit_buf __attribute__((deprecated)); | ^~~~~~~~ drivers/tty/tty_port.c:271:3: warning: 'xmit_buf' is deprecated [-Wdeprecated-declarations] 271 | free_page((unsigned long)port->xmit_buf); | ^~~~~~~~~ In file included from include/linux/tty.h:12, from drivers/tty/tty_port.c:8: include/linux/tty_port.h:115:18: note: declared here 115 | unsigned char *xmit_buf __attribute__((deprecated)); | ^~~~~~~~ vim +/xmit_buf +228 drivers/tty/tty_port.c 8cde11b2baa1d0 drivers/tty/tty_port.c Johan Hovold 2017-05-18 223 9e48565d217a8a drivers/char/tty_port.c Alan Cox 2008-10-13 224 int tty_port_alloc_xmit_buf(struct tty_port *port) 9e48565d217a8a drivers/char/tty_port.c Alan Cox 2008-10-13 225 { 9e48565d217a8a drivers/char/tty_port.c Alan Cox 2008-10-13 226 /* We may sleep in get_zeroed_page() */ 44e4909e453eaa drivers/char/tty_port.c Alan Cox 2009-11-30 227 mutex_lock(&port->buf_mutex); 9e48565d217a8a drivers/char/tty_port.c Alan Cox 2008-10-13 @228 if (port->xmit_buf == NULL) 9e48565d217a8a drivers/char/tty_port.c Alan Cox 2008-10-13 229 port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL); 44e4909e453eaa drivers/char/tty_port.c Alan Cox 2009-11-30 230 mutex_unlock(&port->buf_mutex); 9e48565d217a8a drivers/char/tty_port.c Alan Cox 2008-10-13 231 if (port->xmit_buf == NULL) 9e48565d217a8a drivers/char/tty_port.c Alan Cox 2008-10-13 232 return -ENOMEM; 9e48565d217a8a drivers/char/tty_port.c Alan Cox 2008-10-13 233 return 0; 9e48565d217a8a drivers/char/tty_port.c Alan Cox 2008-10-13 234 } 9e48565d217a8a drivers/char/tty_port.c Alan Cox 2008-10-13 235 EXPORT_SYMBOL(tty_port_alloc_xmit_buf); 9e48565d217a8a drivers/char/tty_port.c Alan Cox 2008-10-13 236 :::::: The code at line 228 was first introduced by commit :::::: 9e48565d217a8a96cc7577308ad41e9e4b806a62 tty: Split tty_port into its own file :::::: TO: Alan Cox <alan(a)redhat.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org